CN101369836B - Wireless signal transmitting/receiving method and transmitting/receiving device - Google Patents

Abstract

The invention discloses a wireless signal transmitting/receiving method and a transmitting/receiving device. The wireless signal transmitting method comprises the following steps: dividing the signals into N path data streams; conducting the block modulation to the R path data stream and the S path data stream and dividing each data stream after block modulation into a first and a second group data blocks; conjugating and complementarily conjugating the second group data blocks of the R and S path data streams, then respectively conducting the block repeated scrambling to the first and the second groups of the data blocks; stacking the first group repeated scrambling data in the R path data stream and the second group repeated scrambling data in the R path data stream; stacking the second group repeated scrambling data in the R path data stream and the first group repeated scrambling data in the R path data stream; conducting the OFDM to the stacked data streams and transmitting the data outward. The wireless signal transmitting/receiving device can improve the space diversity gain of the wireless transmission and the suppressing noise ability.

Description

Wireless signal sending, receiving method and transmission, receiving system

Technical field

The present invention relates to the communications field, particularly relate to wireless signal sending, receiving method and transmission, receiving system.

Background technology

The multiple-input and multiple-output of the communications field (Multiple-Input Multiple-Output; MIMO) technology is meant at transmitting terminal and receiving terminal and uses a plurality of transmitting antennas and reception antenna respectively; Signal transmits and receives through a plurality of antennas of transmitting terminal and receiving terminal; Thereby improve each quality of services for users, as: reduce bit error rate or improve data rate.

A kind of method that transmits signal based on the MIMO technology is in the prior art: in an antenna, send signal and the conjugated signal through other antenna transmission through this antenna transmission successively, obtain the orthogonal coding matrix with this.

The MIMO technology can improve the availability of frequency spectrum for traditional a single aerial system, and the data service of higher rate can be transmitted in the system that makes under the limited wireless frequency band.

In addition; The OFDM that piece repeats inserts (Block Repeat OFDMA; BR-OFDMA) be a kind of re-transmitted and OFDM (Orthogonal Frequency Division Multiple, OFDM) the multiple access access/multiplex mode of combination that proposes recently.

In carrying out the invention process, the inventor finds to exist at least in the above-mentioned existing BR-OFDMA technology following problem:

The inventor finds that this BR-OFDMA technology only has preliminary imagination at present, and in this imagination, the BR-OFDMA technology uses single antenna to send data, therefore utilizes existing BR-OFDMA technology not have the effect of space diversity, can't improve the quality of transfer of data.

Summary of the invention

The technical problem that embodiment of the present invention will solve provides a kind of wireless signal sending, receiving method and transmission, receiving system, can improve the space diversity gain that signal receives.

A kind of wireless signal sending method is provided, comprises: signal is divided into N circuit-switched data stream, and said N is the integer more than or equal to 2; Respectively wherein R circuit-switched data stream being carried out piece with S circuit-switched data stream modulates; Every circuit-switched data after the piece modulation is divided into two groups of data blocks; Be respectively first group of data block and second group of data block, said first group of data block carried out piece repeat scrambling, obtain first chunk and repeat scrambled data; Ask conjugation to handle to second group of data block of said R circuit-switched data stream; Second group of data block of said S circuit-switched data stream carried out the conjugation processing of negating; Carry out piece repetition scrambling to carrying out second group of data block that conjugation is handled and conjugation is negated after handling then; Obtain second chunk and repeat scrambled data, saidly handle and negate with conjugation that the scrambling of second group of data block after handling is adopted and the scrambled code of the said first group of data block quadrature or the low degree of correlation carries out carrying out conjugation; Second chunk described in first chunk repetition scrambled data described in the R circuit-switched data stream and the S circuit-switched data stream is repeated scrambled data to superpose; First chunk described in second chunk repetition scrambled data described in the R circuit-switched data stream and the S circuit-switched data stream is repeated scrambled data to superpose; Said R, S are more than or equal to 1, smaller or equal to the integer of N, and R is not equal to S; The said superimposed data stream of carrying out is carried out the OFDM modulation and sends.

A kind of radio signal receiving method is provided, comprises: receive N circuit-switched data stream and carry out the OFDM demodulation, said N is the integer more than or equal to 2; With corresponding descrambling code wherein R circuit-switched data stream is flowed with the S circuit-switched data respectively and carry out despreading; The descrambling code of said R circuit-switched data stream is to should circuit-switched data flowing the scrambled code in scrambling that transmitting terminal carries out; Comprise two kinds; A kind of is the scrambled code that this circuit-switched data stream that repeats through piece is carried out scrambling, and another kind is to the scrambled code through the S circuit-switched data sts-stream scrambling sts of asking the repetition of conjugation and piece; The descrambling code of said S circuit-switched data stream is to should circuit-switched data flowing the scrambled code in scrambling that transmitting terminal carries out; Comprise two kinds; A kind of is the scrambled code that this circuit-switched data stream that repeats through piece is carried out scrambling, and another kind is the scrambled code of the R circuit-switched data sts-stream scrambling sts that repeats with piece negating through conjugation; Said R, S are more than or equal to 1, smaller or equal to the integer of N, and R is not equal to S; Data flow after the said despreading is carried out the Space-Time Block Coding decoding; Decoded said data flow is carried out parallel/serial conversion, convert circuit-switched data stream to, and carry out demodulation process.

A kind of dispensing device is provided, comprises: string and converting unit, be used for signal is gone here and there and changed, and the different N circuit-switched data stream of output content, said N is the integer more than or equal to 2; The piece modulating unit; Being used for respectively R circuit-switched data stream wherein to said string and converting unit output carries out piece with S circuit-switched data stream and modulates; Every circuit-switched data after the piece modulation is divided into two groups of data blocks, and said R, S are more than or equal to 1, smaller or equal to the integer of N, and R is not equal to S; First repetitive is used for respectively the R circuit-switched data stream of said modulating unit output and first group of data block of S circuit-switched data stream being carried out the piece reprocessing; The conjugation processing unit is used for respectively second group of data block that the R circuit-switched data stream of said modulating unit output and S circuit-switched data flow asked the processing of negating of conjugation and conjugation; Second repetitive is used for second group of data block through said conjugation processing unit processes carried out the piece reprocessing; Scrambling unit is used to adopt the scrambled code of orthogonal or the low degree of correlation respectively the data block of said first repetitive, second repetitive output to be carried out scrambling process; Superpositing unit, be used for the output of said scrambling unit first and second group data block superpose, specifically be first chunk in the R circuit-switched data stream to be repeated second chunk repetition scrambled data superposes in scrambled data and the S circuit-switched data stream; First chunk in second chunk repetition scrambled data in the R circuit-switched data stream and the S circuit-switched data stream is repeated scrambled data to superpose; Modulating unit is used for said first and second group data block after the said superpositing unit stack is carried out the OFDM modulation; Transmitting antenna is used to send the data that said modulating unit is exported.

A kind of receiving system is provided, comprises: reception antenna, be used to receive the N circuit-switched data stream of transmit leg N root antenna transmission, said N is the integer more than or equal to 2; Demodulating unit, the N circuit-switched data stream that is used for said reception antenna is received carries out the OFDM demodulation, and output N circuit-switched data stream; Despread unit; The R circuit-switched data stream wherein and the S circuit-switched data stream that are used for corresponding descrambling code demodulating unit being exported respectively carry out despreading; The descrambling code of said R circuit-switched data stream is to should circuit-switched data flowing the scrambled code in scrambling that transmitting terminal carries out; Comprise two kinds, a kind of is the scrambled code that this circuit-switched data stream that repeats through piece is carried out scrambling, and another kind is to the scrambled code through the S circuit-switched data sts-stream scrambling sts of asking the repetition of conjugation and piece; The descrambling code of said S circuit-switched data stream is to should circuit-switched data flowing the scrambled code in scrambling that transmitting terminal carries out; Comprise two kinds; A kind of is the scrambled code that this circuit-switched data stream that repeats through piece is carried out scrambling, and another kind is the scrambled code of the R circuit-switched data sts-stream scrambling sts that repeats with piece negating through conjugation; Said R, S are more than or equal to 1, smaller or equal to the integer of N, and R is not equal to S; Decoding unit carries out the Space-Time Block Coding decoding to the data flow after the said despread unit despreading; Parallel serial conversion unit is used for the said data flow after the said decoding unit decodes is carried out parallel/serial conversion, exports one road serial data stream.

Above technical scheme can be found out; Because a circuit-switched data is divided into two-way at least, modulation is divided into two groups to the data on each road more at least through piece, altogether at least 4 group data; Before carrying out the piece reprocessing; Each group data stream in the two paths of data is asked processings of negating of conjugation or conjugation, penetrate the space diversity gain of multiple receive antenna system to obtain pilosity, the data flow that will all organize is again carried out piece repetition scrambling; The data flow of the data flow and other a tunnel after the conjugation processing not being carried out the conjugation processing superposes; Make and to handle and not send in same channel, same time, penetrate at pilosity on the basis of multiple receive antenna system and obtain better space diversity gain, promote signal transmission performance through two groups of signals of conjugation reason through conjugation.

Description of drawings

Fig. 1 is the transmitter architecture sketch map of Application of B R-OFMDA method;

Fig. 2 is the theory diagram of dispensing device first execution mode of the present invention;

Fig. 3 is the theory diagram of receiving system first execution mode of the present invention;

Fig. 4 is the theory diagram of dispensing device second execution mode of the present invention;

Fig. 5 is the theory diagram of receiving system second execution mode of the present invention;

Fig. 6 is the theory diagram of dispensing device the 3rd execution mode of the present invention;

Fig. 7 is the theory diagram of dispensing device the 4th execution mode of the present invention;

Fig. 8 is the theory diagram of dispensing device the 5th execution mode of the present invention;

Fig. 9 is the flow chart of wireless signal sending method first execution mode of the present invention;

Figure 10 is the flow chart of radio signal receiving method first execution mode of the present invention;

Figure 11 is the flow chart of radio signal receiving method second execution mode of the present invention.

Embodiment

For make the object of the invention, technical scheme, and advantage clearer, below with reference to the accompanying drawing execution mode that develops simultaneously, to further explain of the present invention.

Fig. 1 is a kind of transmitter architecture sketch map of Application of B R-OFDMA method.Said BR-OFMDA transmitter comprises chnnel coding, interweaves, phase shift keying (PSK; Phase-Shift Keying)/quadrature amplitude modulation (QAM, Quadrature Amplitude Modulation), piece repetition, piece interference, stack, OFDM modulation and single antenna module.

The basic procedure that utilizes this transmitter to carry out data transmission is: between different districts or user, use BR sign indicating number quadrature or low correlation; Then these different districts or user's data of having carried out the piece repetition are superposeed, after OFDM modulation back uses single antenna to send.At receiving terminal, then use joint detection receiver to receive the data that these repeat through piece, obtain to eliminate the technique effect of minizone and inter-user interference at last.

In above-mentioned BR-OFDMA transmitter techniques; Be between different districts or user, to use piece duplication code quadrature or low correlation; And at receiving terminal; Then use joint detection receiver to eliminate the interference between minizone and user, can strengthen the communication efficiency of (like cell edge) under the interference-limited situation, improve systematic function.

One of embodiment of the present invention is under BR-OFDMA multiple access transmission means, to use Space Time Coding, adopts the scheme of many antenna transmission.Such as the scheme that can adopt 2 transmit antennas and 4 transmit antennas; Under 2 transmit antennas schemes, can reach the space diversity effect of space-time block code (STBC); Under 4 transmit antennas schemes,, can realize the transmission rate of rate=1 and rate=2 respectively according to the channel quality indication (CQI, Channel Quality Indication) of transmission channel; Simultaneously, transmitting terminal need not obtain channel information.

Consult Fig. 2, the present invention provides dispensing device first execution mode, comprising:

String and converting unit 201 are used for signal is gone here and there and changed, and the different N channel parallel data stream of output content, and said N is the integer more than or equal to 2; In the present embodiment, be that example is explained with output two-way parallel data stream, be respectively the first via data flow and second circuit-switched data stream;

Piece modulating unit 202; Being used for respectively R circuit-switched data stream wherein to said string and converting unit output carries out piece with S circuit-switched data stream and modulates; Every circuit-switched data after the piece modulation is divided into two groups of data blocks, and said R, S are more than or equal to 1, smaller or equal to the integer of N, and R is not equal to S;

First repetitive 203 is used for the R circuit-switched data stream of said modulating unit 202 outputs and first group of data block of S circuit-switched data stream are carried out the piece reprocessing;

Conjugation processing unit 204 is used for second group data stream that the R circuit-switched data stream of said first repetitive 203 outputs and S circuit-switched data flow is asked the processing of negating of conjugation and conjugation respectively;

Second repetitive 205 is used for second group of data block handling through said conjugation processing unit 204 carried out the piece reprocessing;

Scrambling unit 206, the scrambled code that is used to adopt orthogonal or the low degree of correlation carry out scrambling process to the data block of said first repetitive 203, second repetitive 205 output respectively;

First superpositing unit 207 is used for first chunk described in the R circuit-switched data stream of said scrambling unit 206 processing is repeated scrambled data, superposes with second chunk repetition scrambled data described in the S circuit-switched data stream;

Second superpositing unit 208 is used for second chunk described in the R circuit-switched data stream of said scrambling unit 206 processing is repeated scrambled data, superposes with first chunk repetition scrambled data described in the S circuit-switched data stream;

Above-mentioned first superpositing unit 207, second superpositing unit 208 can integrate.

First modulating unit 209 is used for the said first and third group of data block after 207 stacks of first superpositing unit carried out the OFDM modulation;

Second modulating unit 210 is used for said second, the four group of data block after 208 stacks of second superpositing unit carried out the OFDM modulation;

Above-mentioned first modulating unit 209, second modulating unit 210 can integrate.

First antenna 211 is used to send the data that said first modulating unit 209 is exported;

Second antenna 212 is used to send the data that said second modulating unit 210 is exported.

Above-mentioned first antenna 211, second antenna 212 can integrate.

Above execution mode can be found out:

1) owing to through string and converting unit 201 circuit-switched data is divided into inner different two-way at least, the data on each road are divided into identical two groups more at least through the piece modulation of piece modulating unit 202, altogether at least 4 group data; Adopting before first repetitive 203, second repetitive 205 carry out the piece reprocessing, adopting each one group of data block in 204 pairs of two paths of data of conjugation processing unit to carry out conjugation and handle, creating conditions for obtaining the orthogonal coding matrix at receiving terminal;

2) data block that will all organize is again carried out piece and is repeated scrambling; To obtain to eliminate the technique effect of minizone and inter-user interference; The data block that adopts data block and other a tunnel after first superpositing unit 207, second superpositing unit 208 are handled conjugation not carry out the conjugation processing then superposes; The feasible processing with two groups of unlike signals not managing through conjugation through conjugation sent at same channel; Do not adopt first antenna 211, second antenna 212 to send at one time the two paths of data flow point at last, two antenna transmission can promote transmission rate.

To sum up; Because two groups of unlike signals handling and do not manage through conjugation through conjugation send at same channel simultaneously; Therefore, can obtain the orthogonal coding matrix, make in the embodiment of the present invention at receiving terminal; Penetrate at pilosity and obtain better space diversity gain on the basis of multiple receive antenna system, promote signal and send performance.

Consult Fig. 3, accordingly, the present invention also provides receiving system first execution mode, comprising:

Reception antenna 301 is used to receive the N circuit-switched data stream of transmit leg N root antenna transmission, and said N is the integer more than or equal to 2;

Demodulating unit 302 is used for the N circuit-switched data stream that said reception antenna 301 receives is carried out the OFDM demodulation, and output N circuit-switched data stream;

Despread unit 303; The R circuit-switched data stream wherein and the S circuit-switched data stream that are used for corresponding descrambling code demodulating unit 302 being exported respectively carry out despreading; The descrambling code of said R circuit-switched data stream is to should circuit-switched data flowing the scrambled code in scrambling that transmitting terminal carries out; Comprise two kinds, a kind of is the scrambled code that this circuit-switched data stream that repeats through piece is carried out scrambling, and another kind is to the scrambled code through the S circuit-switched data sts-stream scrambling sts of asking the repetition of conjugation and piece; The descrambling code of said S circuit-switched data stream is to should circuit-switched data flowing the scrambled code in scrambling that transmitting terminal carries out; Comprise two kinds; A kind of is the scrambled code that this circuit-switched data stream that repeats through piece is carried out scrambling, and another kind is the scrambled code of the R circuit-switched data sts-stream scrambling sts that repeats with piece negating through conjugation; Said R, S are more than or equal to 1, smaller or equal to the integer of N, and R is not equal to S;

Decoding unit 304 carries out the Space-Time Block Coding decoding to the data flow after said despread unit 303 despreadings;

Parallel serial conversion unit 305 is used for said decoding unit 304 decoded said data flow are carried out parallel/serial conversion, exports one road serial data stream.

In this execution mode, demodulating unit 302 is that first modulating unit 209, second modulating unit 210 to dispensing device in the foregoing description carries out the reverse process that the data after the OFDM modulation are carried out; And despread unit 303 is that first repetitive of above-mentioned dispensing device 203, second repetitive 205 are carried out the reverse process that the data after piece repeats are carried out; Decoding unit 304 is that the scrambling unit 206 to above-mentioned dispensing device carries out the reverse process that the data after the scrambling are carried out.Operation through above-mentioned each unit; Can obtain the original to be sent signal of dispensing device one side before carrying out transmit operation; And, the every circuit-switched data that receives comprises that same channel process conjugation processing of sending and two chunks of not managing through conjugation repeat scrambled data because flowing; Therefore, can penetrate at pilosity at receiving terminal and to obtain better space diversity gain on the basis of multiple receive antenna system, promote signal receiving performance.

Consult Fig. 4, dispensing device second execution mode of the present invention comprises:

Coding unit 213 is used for original signal to be sent is encoded.

Symbol-modulated unit 214 is used for the data of coding unit 213 outputs are modulated.

String and converting unit 201; Be used for the signal of symbol-modulated unit 214 output is gone here and there and changed, and the different stream of two paths of data at least of output content, in the present embodiment; Transmission signals is after coded modulation; Through the string and the conversion process of string and converting unit 201, be example with output two paths of data stream, be respectively the first via data flow and second circuit-switched data stream.

Piece modulating unit 202; Be used for said first data flow is carried out the piece modulation; Comprise converting said first data flow to first time-frequency two-dimensional data blocks, and export first, second at least and organize two groups of identical data blocks, said second data flow is carried out the piece modulation; Comprise converting said second data flow to second time-frequency two-dimensional data blocks, and export the 3rd, the 4th group of two groups of identical data blocks at least; Here, piece modulating unit 202 is carried out to the piece processing with the data flow on each road, and the generation unit piece is also exported identical two groups.First group gets into following piece repetitive, and second group then is input to following conjugation processing unit 204.

Give one example, the data of establishing the i layer through the data block that piece modulation back forms are:

First repetitive 203 is used for the said first, fourth group of data block from said modulating unit 202 carried out the piece reprocessing; Here, 203 pairs of cell block data of first repetitive are carried out reprocessing, such as a data block A being repeated into two data blocks [A, A].

Conjugation processing unit 204 is used for asking conjugation and conjugation to negate respectively to said second and third group data stream; Here, it can be that the data block in second group data stream is asked conjugation that conjugation is handled, and the data block conjugation in the 3rd group data stream is negated; Otherwise, also can negate to the data block conjugation in second group data stream, the data block in the 3rd group data stream is asked conjugation.

Second repetitive 205 is used for second and third group data block of handling through said conjugation processing unit 204 is carried out the piece reprocessing; Here carrying out piece repeated operation process can be referring to the processing of first repetitive 203.

Scrambling unit 206 is used to adopt the scrambled code of orthogonal or the low degree of correlation respectively the data block of said first and second piece repetitive output to be carried out scrambling process; The scrambling process here can be the weighted factor sequence of data block dot product after piece is repeated.This weighted factor sequence can be accurate scrambler sequence or orthogonal code sequence at random.Weighting sequence factor length equals the piece number of repetition, generates a plurality of after the dot product.The scrambled code that each group data block is used on the same transmit antenna is the scrambled code of the orthogonal code or the low degree of correlation.

It is that data block after 2 orthogonal code sequence repeats piece is carried out scrambling that scrambling unit 206 can use spreading factor, and k scrambler sequence is w _k=[w _{K, 1}w _{K, 2}] ^T(k=1,2) are without loss of generality, consider the in the piece (m, n) individual symbol are convenient the expression, do not cause omit under the situation about obscuring subscript (m, n).

First superpositing unit 207 is used for said first and third group of data block handling through scrambling unit 206 superposeed.

Second superpositing unit 208 is used for said second, four group of data block handling through scrambling unit 206 superposeed.

First modulating unit 209 is used for the said first and third group of data block after 207 stacks of first superpositing unit carried out the OFDM modulation.

Second modulating unit 210 is used for said second, the four group of data block after 208 stacks of second superpositing unit carried out the OFDM modulation.

Above-mentioned first and second modulating unit carries out anti-FFT (IFFT) to superimposed data stream, generates time-domain signal to be ready for sending.

First transmitting antenna 211 is used to send the data that said first modulating unit 209 is exported; On this antenna transmit for:

$s^1=\left[\begin{array}{c}{s}_{t1}^1\\ s_{t2}^1\end{array}\right]=\left[\begin{array}{c}{w}_{11}{x}_1-w_{21}{x}_2^{*}\\ w_{12}{x}_1-w_{22}{x}_2^{*}\end{array}\right]---\left(2\right)$

Second transmitting antenna 212 is used to send the data that said second modulating unit 210 is exported.On this antenna transmit for:

$s^2=\left[\begin{array}{c}{s}_{t1}^2\\ s_{t2}^2\end{array}\right]=\left[\begin{array}{c}{w}_{11}{x}_2+w_{21}{x}_1^{*}\\ w_{12}{x}_2+w_{22}{x}_1^{*}\end{array}\right]---\left(3\right)$

Also consult Fig. 3, correspondingly, the present invention provides receiving system second execution mode, comprising:

Reception antenna 301 is used to receive the two paths of data stream of at least two antenna transmission of transmit leg, every circuit-switched data stream comprise process conjugation that same channel sends handle with not through the two chunks repetition scrambled data of conjugation reason.

The two paths of data that this reception antenna 301 receives is the data through fading channel, can represent respectively with following formula:

$y_{t1}=h_{11}^{t1}{s}_{t1}^1+h_{12}^{t1}{s}_{t1}^2+n_{t1}$ $\left(4\right)$

$y_{t2}=h_{11}^{t2}{s}_{t2}^1+h_{12}^{t1}{s}_{t2}^2+n_{t2}$

In the following formula, n _tBe white Gaussian noise, because var{n _t}=σ ²,, have (3) substitution (4)

$y_{t1}=h_{11}^{t1}{w}_{11}{x}_1-h_{11}^{t1}{w}_{21}{x}_2^{*}+h_{12}^{t1}{w}_{11}{x}_2+h_{12}^{t1}{w}_{21}{x}_1^{*}+n_{t1}$ $\left(5\right)$

$y_2=h_{11}^{t2}{w}_{12}{x}_1-h_{11}^{t2}{w}_{22}{x}_2^{*}+h_{12}^{t1}{w}_{12}{x}_2+h_{12}^{t1}{w}_{22}{x}_1^{*}+n_{t2}$

Demodulating unit 302 is used for the data that said reception antenna 301 receives are carried out the OFDM demodulation, and exports two paths of data stream at least.

Despread unit 303 is used for the stream of two paths of data at least of said demodulating unit 302 outputs is carried out despreading; Specifically be with corresponding descrambling code the said stream of two paths of data at least to be carried out despreading respectively; The corresponding transmitting terminal of said descrambling code is to the scrambled code of a circuit-switched data scrambling that piece carries out; The said scrambled code that a circuit-switched data piece is carried out scrambling comprises two kinds; A kind of is the scrambled code that the data block that repeat through piece on this road is carried out scrambling, and another kind is through the negate scrambled code of the data block scrambling that repeats with piece of conjugation/conjugation to another road; Corresponding above-mentioned dispensing device second execution mode; The said scrambled code that a circuit-switched data piece is carried out scrambling is exactly the scrambled code that first via data block is carried out scrambling, comprises that first group of data block carried out piece to be repeated the scrambled code of scrambling and the 3rd group of data block carried out the scrambled code that conjugation is negated, piece repeats scrambling.

Decoding unit 304 carries out the Space-Time Block Coding decoding to the data flow after said despread unit 303 despreadings.

This execution mode can think that receiving system moves under the low speed situation; When low speed moves; Can be similar to and think that

is after carrying out the OFDM demodulation to the received signal; Carry out despreading to received signal with orthogonal sequence; And the orthogonality between the consideration sequence; Decode together, the expression formula of following decoding back two paths of data arranged:

$z_1=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{w}_{1,i}{y}_{\mathrm{ti}}=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{w}_{1,i}^2(h_{11}{x}_1+h_{12}{x}_2)+\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{w}_{1,i}{n}_{\mathrm{ti}}---\left(6\right)$

$z_2=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{w}_{2,i}{y}_{\mathrm{ti}}=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{w}_{2,i}^2(h_{12}{x}_1^{*}-h_{11}{x}_2^{*})+\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{w}_{2,i}{n}_{\mathrm{ti}}---\left(7\right)$

Suppose that orthogonal sequence is walsh sequence, i.e. w ₁=[1 1] ^T, w ₂=[1-1] ^T, then by following formula can obtain into:

$\left[\begin{array}{c}{\tilde{z}}_1\\ {\tilde{z}}_2^{*}\end{array}\right]=\left[\begin{array}{cc}{h}_{11}& h_{12}\\ h_{12}^{*}& -h_{11}^{*}\end{array}\right]\left[\begin{array}{c}{x}_1\\ x_2\end{array}\right]+\left[\begin{array}{c}{\tilde{n}}_1\\ {\tilde{n}}_2^{*}\end{array}\right]---\left(8\right)$

In the formula, ${\tilde{z}}_i=z_i/2,$ ${\tilde{n}}_k=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{w}_{k,i}{n}_{\mathrm{Ti}}/2,$ And $\mathrm{Var}\left\{{\tilde{n}}_k\right\}={\mathrm{\σ}}^2/2.$

Formula (8) is that a typical STBC receives expression formula, can carry out the Space-Time Block Coding decoding to it, detect such as carrying out Alamouti, and because the effect that piece repeats, the variance of noise is reduced to σ ²/ 2, thus receptivity can effectively be improved.

Parallel serial conversion unit 305 is used for said decoding unit 304 decoded said data flow are carried out parallel/serial conversion, exports one road serial data stream, obtains original transmission signal.

Consult Fig. 5, receiving system the 3rd execution mode of the present invention and above-mentioned second execution mode are similar, and difference is:

Receiving system receives data under at a high speed.

Said antenna comprises the 5th reception antenna 501 and the 6th reception antenna 502, receives the stream of two paths of data at least from different antennae respectively.

When receiving system moved at a relatively high speed, Doppler frequency deviation caused channel that variation is faster arranged, and supposed that the channel of two repeatable blocks that antenna transmission of transmitting terminal is come is approximate unequal this moment.Be furnished with under the 5th, 6 two reception antenna 501,502 situation at receiving terminal, the reception signal that can be obtained on the 5th, six reception antennas 501,502 by formula (5) is:

$\left\{\begin{array}{c}{y}_{t1}^1=h_{11}^{t1}{w}_{11}{x}_1-h_{11}^{t1}{w}_{21}{x}_2^{*}+h_{12}^{t1}{w}_{11}{x}_2+h_{12}^{t1}{w}_{21}{x}_1^{*}+n_{t1}^1\\ y_{t1}^2=h_{21}^{t1}{w}_{11}{x}_1-h_{21}^{t1}{w}_{21}{x}_2^{*}+h_{22}^{t1}{w}_{11}{x}_2+h_{22}^{t1}{w}_{21}{x}_1^{*}+n_{t1}^2\\ y_{t2}^1=h_{11}^{t2}{w}_{12}{x}_1-h_{11}^{t2}{w}_{22}{x}_2^{*}+h_{12}^{t1}{w}_{12}{x}_2+h_{12}^{t1}{w}_{22}{x}_1^{*}+n_{t2}^1\\ y_{t2}^2=h_{21}^{t2}{w}_{12}{x}_1-h_{21}^{t2}{w}_{22}{x}_2^{*}+h_{22}^{t1}{w}_{12}{x}_2+h_{22}^{t1}{w}_{22}{x}_1^{*}+n_{t2}^2\end{array}\right.---\left(9\right)$

In the formula; Reception signal on

expression t moment i reception antenna, (9) formula can be write as matrix form:

$\left[\begin{array}{c}{y}_{t1}^1\\ y_{t1}^2\\ y_{t2}^1\\ y_{t2}^2\end{array}\right]=\left[\begin{array}{cccc}{h}_{11}^{t1}{w}_{11}& -h_{11}^{t1}{w}_{21}& h_{12}^{t1}{w}_{11}& h_{12}^{t1}{w}_{21}\\ h_{21}^{t1}{w}_{11}& -h_{21}^{t1}{w}_{21}& h_{22}^{t1}{w}_{11}& h_{22}^{t1}{w}_{21}\\ h_{11}^{t2}{w}_{12}& -h_{11}^{t2}{w}_{22}& h_{12}^{t1}{w}_{12}& h_{12}^{t1}{w}_{22}\\ h_{21}^{t2}{w}_{12}& -h_{21}^{t2}{w}_{22}& h_{22}^{t1}{w}_{12}& h_{22}^{t1}{w}_{22}\end{array}\right]\left[\begin{array}{c}{x}_1\\ x_2^{*}\\ x_2\\ x_1^{*}\end{array}\right]+\left[\begin{array}{c}{n}_{t1}^1\\ n_{t1}^2\\ n_{t2}^1\\ n_{t2}^2\end{array}\right]---\left(10\right)$

Be reduced to:

Y＝HX+n (11)

Said demodulating unit comprises first demodulating unit 503 and second demodulating unit 504, is respectively applied for the data that said the 5th reception antenna 501, the 6th reception antenna 502 are received and carries out the OFDM demodulation, and export at least one circuit-switched data stream respectively.

Said despread unit and decoding unit are the signal estimation units 505 that integrates, and are used to adopt least mean-square error to estimate that MMSE carries out joint-detection to the said stream of two paths of data at least.Said signal estimation unit 505 is input channel estimated information and spreading code in addition, to help to realize the signal estimation.

The data that MMSE obtains after detecting are:

$\hat{X}={({\left(H^{\′}\right)}^H{H}^{\′}+{\mathrm{\σ}}^{2}I)}^{-1}{\left(H^{\′}\right)}^H\·Y---\left(12\right)$

Further, by $X={\left[\begin{array}{cccc}{x}_1& x_2^{*}& x_2& x_1^{*}\end{array}\right]}^T$ Can obtain desired detection data, merge after obtaining soft information respectively, thereby obtain space diversity gain.

The front mainly is described in carries out the situation that signal sends under two antenna situation, below the present invention also be provided at and carry out the situation that signal sends under four antenna situation, be divided into transmission rate again and be 1,2 situation.

One, transmission rate is 1

Scheme 1) consult Fig. 6, this programme further comprises on the basis of above-mentioned dispensing device second execution mode:

The 3rd transmitting antenna 215 and the 4th transmitting antenna 216;

Deployment unit 217, the mode with the space repeating query of being used for adopt first transmitting antenna 211, second transmitting antenna 212 and the 3rd transmitting antenna 215, the 4th transmitting antenna 216 to send said data flow respectively.

This programme provides 4 transmitting antennas, selects two transmit antennas to carry out piece expansion transmission diversity (BSTD) transmission at every turn, and 4 transmit antennas adopt the mode of space repeating query.And the detection algorithm of receiving terminal is with above-mentioned 2 reception antenna detection methods.

Scheme 2) consult Fig. 7, this programme further comprises on the basis of above-mentioned dispensing device second execution mode:

First transmitting antenna 211, second transmitting antenna 212, the 3rd transmitting antenna 215, the 4th transmitting antenna 216.

Frequency division unit 218 is used for primary signal is divided into the M road on the different frequency bands, corresponding string and the converting unit of every road signal input, and said M is the integer more than or equal to 2; Such as primary signal being divided into the signal of two-way on different frequency bands, corresponding string and the converting unit 201 of every road signal input.The two paths of data stream of string and converting unit 201 outputs is input to the piece modulating unit 202 of said dispensing device second execution mode.

This programme is that BSTD is combined with FSTD, earlier the data flow of input is carried out FSTD, is divided into 2 road signals.In each physical resource unit, the sub-carrier positions that this two paths of signals occupies is mutually orthogonal.And two data symbols that guarantee to carry out the BSTD coding are in identical data flow.Then every road signal is carried out processing shown in Figure 3, deliver to the emission of 4 transmit antennas.

Two, transmission rate is 2

For the system of 4 transmit antennas, when channel quality is better, can adopt the higher emission diversity scheme of speed, as shown in Figure 8.Specifically be that string and converting unit 219 are gone here and there and when changing, exported 4 circuit-switched data stream, then every two paths of data stream carried out the processing shown in above-mentioned dispensing device second execution mode.

At receiving terminal, can adopt the MMSE algorithm that the transmission data are detected.

What be worth explanation is; Dispensing device execution mode of the present invention is not limited to the situation of 2 antennas or 4 antennas; Can be structures such as 6 antennas, 8 antennas, the mode of these many antennas can be the simple repetition of 2 antennas or 4 antenna transmission devices, such as; The dispensing device of 6 antennas can be the combination of three 2 antenna transmission devices, also can be the combination of one 4 antenna transmission device and one 2 antenna transmission device; The dispensing device of 8 antennas can be the combination of two 4 antenna transmission devices, can be the combination of four 2 antenna transmission devices also, and the rest may be inferred.Further, dispensing device of the present invention can be the dispensing device of 3 antenna structures, can be the combination of the present invention's 2 antenna transmission devices and existing 1 antenna transmission device, and in like manner, the dispensing device of 5 antennas, 7 antennas also can adopt similar structure.Receiving system one side, also can adopt similar method to realize that many antennas receive.

What be worth explanation is that each unit in aforementioned dispensing device first execution mode of the present invention can be integrated in the processing module; In like manner, each unit in aforementioned dispensing device of the present invention second execution mode etc., first and second execution mode of receiving system also can be integrated in the processing module; Perhaps, any two or more in each unit of aforementioned each execution mode can be integrated in the processing module.

Also worth explanation is, each unit in the embodiment of the present invention both can adopt the form of hardware to realize, but the part that software is realized also can adopt the form of software function module to realize.Correspondingly, embodiment of the present invention both can be used as independently production marketing or use, sold in the computer read/write memory medium or used but the part that software is realized also can be stored in.

Consult Fig. 9, the present invention also provides the wireless signal sending method first execution mode, may further comprise the steps:

Step 1001: signal is divided into N circuit-switched data stream, and said N is the integer more than or equal to 2; In this execution mode, specifically be that signal is gone here and there and changed (S/P), be divided into the two-way different data flow;

Step 1002: respectively wherein R circuit-switched data stream is carried out piece with S circuit-switched data stream and modulate;

Step 1003: the every circuit-switched data after the piece modulation is divided into two groups of data blocks, is respectively first group of data block and second group of data block, said first group of data block carried out piece repeat scrambling, obtain first chunk and repeat scrambled data; Ask conjugation to handle to second group of data block of said R circuit-switched data stream; Second group of data block of said S circuit-switched data stream carried out the conjugation processing of negating; Then said second group of data block carried out piece and repeat scrambling; Obtain second chunk and repeat scrambled data, said scrambling to second group of data block adopts and the scrambled code of the said first group of data block quadrature or the low degree of correlation carries out;

Step 1004: second chunk described in first chunk repetition scrambled data described in the R circuit-switched data stream and the S circuit-switched data stream is repeated scrambled data superpose; First chunk described in second chunk repetition scrambled data described in the R circuit-switched data stream and the S circuit-switched data stream is repeated scrambled data to superpose; Said R, S are more than or equal to 1, smaller or equal to the integer of N, and R is not equal to S;

Step 1005: the said data block after will superposeing is carried out the OFDM modulation;

Step 1006: send the data flow after the OFDM modulation is carried out on said N road.

Above first embodiment of the invention can find out that owing in step 1001, circuit-switched data stream is divided into two-way at least, the data flow on each road is divided into two groups more at least through the piece modulation of step 1002, altogether at least 4 group data; Before carrying out the piece reprocessing, in step 1003, each group data stream in the two paths of data is carried out conjugation and handle, penetrate the space diversity gain of multiple receive antenna system to obtain pilosity; The data flow that to all organize is again carried out piece and is repeated scrambling; The data flow that data flow and other a tunnel after in step 1004, conjugation being handled is not carried out the conjugation processing superposes; The feasible processing with two groups of signals not managing through conjugation through conjugation sent at same channel; In step 1006, do not adopt different antennas to send at one time the two paths of data flow point at last, penetrate at pilosity and obtain better space diversity gain on the basis of multiple receive antenna system, promote signal and send performance.

In other embodiments,

Said step 1001: the signal that signal is divided in the N circuit-switched data stream adopts the mode of frequency division to obtain; Specifically be to adopt the frequency domain switching emission to divide the frequency division mode of collection FSTD that primary signal is divided into the different two paths of signals at least of content, every road signal is carried out the processing of step 1002 and subsequent step thereof.

Perhaps, said step 1001 comprises:

With the minimum four circuit-switched data stream that is divided into of said signal, such as being divided into first, second, third and fourth road content different data flow, said third and fourth data flow adopts and the same processing mode of first and second data flow.

Said step 1006: send the data flow of carrying out after OFDM is modulated on said N road and comprise:

Adopting quantity with the mode of space repeating query is that the transmitting antenna of data flow multiple sends said data flow of carrying out after the OFDM modulation.

Consult Figure 10, accordingly, the present invention also provides radio signal receiving method first execution mode, may further comprise the steps:

Step 1101: receive N circuit-switched data stream and carry out the OFDM demodulation, said N is the integer more than or equal to 2;

Step 1102: with corresponding descrambling code wherein R circuit-switched data stream is flowed with the S circuit-switched data respectively and carry out despreading; The descrambling code of said R circuit-switched data stream is to should circuit-switched data flowing the scrambled code in scrambling that transmitting terminal carries out; Comprise two kinds; A kind of is the scrambled code that this circuit-switched data stream that repeats through piece is carried out scrambling, and another kind is to the scrambled code through the S circuit-switched data sts-stream scrambling sts of asking the repetition of conjugation and piece; The descrambling code of said S circuit-switched data stream is to should circuit-switched data flowing the scrambled code in scrambling that transmitting terminal carries out; Comprise two kinds; A kind of is the scrambled code that this circuit-switched data stream that repeats through piece is carried out scrambling, and another kind is the scrambled code of the R circuit-switched data sts-stream scrambling sts that repeats with piece negating through conjugation; Said R, S are more than or equal to 1, smaller or equal to the integer of N, and R is not equal to S;

Step 1103: the data flow after the said despreading is carried out the Space-Time Block Coding decoding;

Step 1104: decoded said data flow is carried out parallel/serial conversion (P/S), convert circuit-switched data stream to, and carry out demodulation, decoding processing.

In other embodiments, said Space-Time Block Coding decoding is meant that decoded said data flow is carried out Alamouti to be detected.

Consult Figure 11, the present invention also provides radio signal receiving method second execution mode, may further comprise the steps:

Step 1201: adopt N root reception antenna to receive the N circuit-switched data stream from different antennae respectively, and carry out the OFDM demodulation respectively, said N is the integer more than or equal to 2;

Step 1202: estimate that with least mean-square error MMSE carries out joint-detection to said N circuit-switched data stream;

Step 1203: decoded said data flow is carried out demodulation.

One of ordinary skill in the art will appreciate that all or part of step that realizes in the said method execution mode is to instruct relevant hardware to accomplish through program; Described program can be stored in the computer read/write memory medium; This program can comprise the content of aforementioned each execution mode of wireless signal sending, receiving method of the present invention when carrying out.Here the alleged storage medium that gets, as: ROM/RAM, magnetic disc, CD etc.

To sum up, the present invention can produce following technique effect at least:

1, improves space diversity gain.The BSTD transmission plan that embodiment of the present invention proposes has been introduced multi-antenna technology in BR-OFDMA, make and obtained space diversity gain in the data transmission procedure.

2, improve the noise ability that suppresses.With existing STBC compared with techniques, embodiment of the present invention can suppress noise better, thereby further improve receptivity effectively owing to the effect that piece repeats.

More than a kind of wireless signal sending, receiving method provided by the present invention and transmission, receiving system have been carried out detailed introduction through specific embodiment, the explanation of above embodiment just is used for help understanding method of the present invention and thought thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.

Claims (11)

1. a wireless signal sending method is characterized in that, comprising:

Signal is divided into N circuit-switched data stream, and said N is the integer more than or equal to 2;

Respectively wherein R circuit-switched data stream being carried out piece with S circuit-switched data stream modulates; Every circuit-switched data after the piece modulation is divided into two groups of data blocks; Be respectively first group of data block and second group of data block, said first group of data block carried out piece repeat scrambling, obtain first chunk and repeat scrambled data; Ask conjugation to handle to second group of data block of said R circuit-switched data stream; Second group of data block of said S circuit-switched data stream carried out the conjugation processing of negating; Carry out piece repetition scrambling to carrying out second group of data block that conjugation is handled and conjugation is negated after handling then; Obtain second chunk and repeat scrambled data, saidly handle and negate with conjugation that the scrambling of second group of data block after handling is adopted and the scrambled code of the said first group of data block quadrature or the low degree of correlation carries out carrying out conjugation;

Second chunk described in first chunk repetition scrambled data described in the R circuit-switched data stream and the S circuit-switched data stream is repeated scrambled data to superpose; First chunk described in second chunk repetition scrambled data described in the R circuit-switched data stream and the S circuit-switched data stream is repeated scrambled data to superpose; Said R, S are more than or equal to 1, smaller or equal to the integer of N, and R is not equal to S;

The said superimposed data stream of carrying out is carried out the OFDM modulation and sends.

2. wireless signal sending method according to claim 1 is characterized in that, said step: the signal that signal is divided in the N circuit-switched data stream adopts the mode of frequency division to obtain.

3. wireless signal sending method according to claim 2 is characterized in that, the mode of said employing frequency division comprises: adopt the frequency domain switching emission to divide the frequency division mode of collection FSTD.

4. wireless signal sending method according to claim 1 is characterized in that, said step: signal is divided into N circuit-switched data stream comprises:

Said signal is divided into first, second, third and fourth different circuit-switched data stream of content, and said third and fourth circuit-switched data stream adopts and the same processing mode of first and second circuit-switched data stream.

5. wireless signal sending method according to claim 1 is characterized in that, said modulation specifically is to convert data flow to time-frequency two-dimensional data blocks.

6. according to claim 1, it is characterized in that said step: the said superimposed data stream that carries out is carried out the OFDM modulation and send comprising:

Adopting quantity with the mode of space repeating query is that the transmitting antenna of data flow multiple sends said data flow of carrying out after the OFDM modulation.

7. a radio signal receiving method is characterized in that, comprising:

Receive N circuit-switched data stream and carry out the OFDM demodulation, said N is the integer more than or equal to 2;

With corresponding descrambling code wherein R circuit-switched data stream is flowed with the S circuit-switched data respectively and carry out despreading; The descrambling code of said R circuit-switched data stream is to should circuit-switched data flowing the scrambled code in scrambling that transmitting terminal carries out; Comprise two kinds; A kind of is the scrambled code that this circuit-switched data stream that repeats through piece is carried out scrambling, and another kind is to the scrambled code through the S circuit-switched data sts-stream scrambling sts of asking the repetition of conjugation and piece; The descrambling code of said S circuit-switched data stream is to should circuit-switched data flowing the scrambled code in scrambling that transmitting terminal carries out; Comprise two kinds; A kind of is the scrambled code that this circuit-switched data stream that repeats through piece is carried out scrambling, and another kind is the scrambled code of the R circuit-switched data sts-stream scrambling sts that repeats with piece negating through conjugation; Said R, S are more than or equal to 1, smaller or equal to the integer of N, and R is not equal to S;

Data flow after the said despreading is carried out the Space-Time Block Coding decoding;

Decoded said data flow is carried out parallel/serial conversion, convert circuit-switched data stream to, and carry out demodulation process.

8. a dispensing device is characterized in that, comprising:

String and converting unit are used for signal is gone here and there and changed, and the different N circuit-switched data stream of output content, and said N is the integer more than or equal to 2;

The piece modulating unit; Being used for respectively R circuit-switched data stream wherein to said string and converting unit output carries out piece with S circuit-switched data stream and modulates; Every circuit-switched data after the piece modulation is divided into two groups of data blocks, and said R, S are more than or equal to 1, smaller or equal to the integer of N, and R is not equal to S;

First repetitive is used for respectively the R circuit-switched data stream of said modulating unit output and first group of data block of S circuit-switched data stream being carried out the piece reprocessing;

The conjugation processing unit is used for respectively second group of data block that the R circuit-switched data stream of said modulating unit output and S circuit-switched data flow asked the processing of negating of conjugation and conjugation;

Second repetitive is used for second group of data block through said conjugation processing unit processes carried out the piece reprocessing;

Scrambling unit is used to adopt the scrambled code of orthogonal or the low degree of correlation respectively the data block of said first repetitive, second repetitive output to be carried out scrambling process;

Superpositing unit is used for first and second group data block of said scrambling unit output is superposeed, and specifically is second chunk in first chunk repetition scrambled data in the R circuit-switched data stream and the S circuit-switched data stream to be repeated scrambled data superpose; First chunk in second chunk repetition scrambled data in the R circuit-switched data stream and the S circuit-switched data stream is repeated scrambled data to superpose;

Modulating unit is used for said first and second group data block after the said superpositing unit stack is carried out the OFDM modulation;

Transmitting antenna is used to send the data that said modulating unit is exported.

9. dispensing device according to claim 8 is characterized in that, further comprises:

The frequency division unit is used for primary signal is divided into the M road on the different frequency bands, corresponding string of every road signal input and converting unit, and said M is the integer more than or equal to 2.

10. a receiving system is characterized in that, comprising:

Reception antenna is used to receive the N circuit-switched data stream of transmit leg N root antenna transmission, and said N is the integer more than or equal to 2;

Demodulating unit, the N circuit-switched data stream that is used for said reception antenna is received carries out the OFDM demodulation, and output N circuit-switched data stream;

Despread unit; The R circuit-switched data stream wherein and the S circuit-switched data stream that are used for corresponding descrambling code demodulating unit being exported respectively carry out despreading; The descrambling code of said R circuit-switched data stream is to should circuit-switched data flowing the scrambled code in scrambling that transmitting terminal carries out; Comprise two kinds, a kind of is the scrambled code that this circuit-switched data stream that repeats through piece is carried out scrambling, and another kind is to the scrambled code through the S circuit-switched data sts-stream scrambling sts of asking the repetition of conjugation and piece; The descrambling code of said S circuit-switched data stream is to should circuit-switched data flowing the scrambled code in scrambling that transmitting terminal carries out; Comprise two kinds; A kind of is the scrambled code that this circuit-switched data stream that repeats through piece is carried out scrambling, and another kind is the scrambled code of the R circuit-switched data sts-stream scrambling sts that repeats with piece negating through conjugation; Said R, S are more than or equal to 1, smaller or equal to the integer of N, and R is not equal to S;

Decoding unit carries out the Space-Time Block Coding decoding to the data flow after the said despread unit despreading;

Parallel serial conversion unit is used for the said data flow after the said decoding unit decodes is carried out parallel/serial conversion, exports one road serial data stream.

11. receiving system according to claim 10 is characterized in that,

Said despread unit and decoding unit are the signal estimation units that integrates, and are used to adopt least mean-square error to estimate that MMSE carries out joint-detection to two paths of data stream at least.

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