CN104540202A - LTE self-adaptation signal transmitting system - Google Patents

Abstract

The invention discloses an LTE self-adaptation signal transmitting system. The system comprises a pilot signal power determining unit, a signal transmitting unit, a link estimating unit, a feedback unit and a communication terminal group selecting unit. According to the LTE self-adaptation signal transmitting system, the link estimation error of a multi-communication-terminal LTE system and the communication terminal dispatching of a multi-communication-terminal environment are taken into consideration, the best suitable matching relation of pilot frequency iteration estimation and resource allocation of LTE links is deduced according to the multi-communication-terminal LTE capacity, pilot signals most suitable for pilot signal power transmitting are adopted, data transmitting is carried out, wherein the number of the pilot signals is equal to the number of transmitting antennas of a base station, and therefore the accuracy of link estimation and the throughput performance of LTE links are improved.

Description

A kind of LTE self-adapting signal emission system

Technical field

The present invention relates to wireless communication field, particularly relate to a kind of LTE self-adapting signal emission system.

Background technology

LTE (Long Term Evolution, Long Term Evolution) be by 3GPP (The 3rd GenerationPartnership Project, third generation partner program) UMTS (the Universal MobileTelecommunications System that organizes to set up, universal mobile telecommunications system) Long Term Evolution of technical standard, in December, 2004 formally set up the project and start in the TSG RAN#26 meeting of 3GPP Toronto.LTE system introduces OFDM (Orthogonal Frequency Division Multiplexing, OFDM) and MIMO (Multi-Input & Multi-Output, multiple-input and multiple-output) etc. crucial lift-off technology, (20M bandwidth 2X2MIMO is in 64QAM situation to significantly increase spectrum efficiency and data transmission rate, theoretical descending emission maximum speed is 201Mbps, be probably 140Mbps after removing signaling consumption, but according to actual networking and terminal capability restriction, it is generally acknowledged that downlink peak rates is 100Mbps, upper behavior 50Mbps), and support that various bandwidth is distributed: 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20MHz etc., and support global main flow 2G/3G frequency range and some newly-increased frequency ranges, thus spectrum allocation may is more flexible, power system capacity and covering also significantly promote.The LTE system network architecture more flattening is simplified, and decreases network node and system complexity, thus reduces Time Delay of Systems, also reduce network design and maintenance cost.LTE system is supported and other 3GPP interoperability of system.LTE system has two kinds of standard: FDD-LTE and TDD-LTE, i.e. Frequency Division Duplexing (FDD) LTE system and time division duplex LTE system, and the main distinction of the two technology is in the physical layer of air interface (picture frame structure, time-division design, synchronous etc.).UHF band reception and the transmitting data of employing a pair symmetry are launched in the up-downgoing of eating dishes without rice or wine of FDD-LTE system, and TDD-LTE system up-downgoing then uses identical frequency range to launch on different time slots, and relative to FDD duplex mode, TDD has the higher availability of frequency spectrum.

But in many communication terminals LTE system, except link evaluated error etc. and the common Problems existing of single communication terminal LTE system, the multiple terminals diversity that many communication terminals LTE system also exists itself, the problems such as terminal room interference and multiple terminals scheduling, this makes the most applicable matching relationship of pilot tone iterative estimate and the resource distribution obtained from the analysis of single communication terminal LTE system and is not suitable for many communication terminals LTE system, so be worth research for the pilot tone iterative estimate of many communication terminals LTE system broadcasting link and the most applicable matching relationship of resource distribution.

Summary of the invention

The object of the invention is to be achieved through the following technical solutions.

According to the embodiment of the present invention, propose a kind of LTE self-adapting signal emission system, described system comprises: pilot signal power determining unit, signal transmitter unit, link estimation unit, feedback unit and communication terminal group selection unit, wherein,

Described pilot signal power determining unit is under link Rayleigh fading condition, preset in a packet number of transmit antennas M launching at most symbolic number T and be greater than base station, the most applicable matching relationship according to pilot tone iterative estimate and resource distribution determines the most applicable pilot signal power

Described signal transmitter unit is with the most applicable described pilot signal power m pilot signal is launched to only having the communication terminal of a reception antenna;

Described link estimation unit utilizes and carries out link estimation to the receiving matrix of pilot signal;

Described feedback unit is used for link estimated result to come back to the base platform;

Described communication terminal group selection unit is not less than base station number of transmit antennas M based on communication terminal number K in predetermined system, according to the communication termination-link information that communication terminal returns, carries out the selection of launching communication terminal group;

Described signal transmitter unit also in notebook data bag for M selected transmitting communication terminal with system data power P _dlaunch T-M data symbol.

According to the embodiment of the present invention, the described the most applicable matching relationship according to pilot tone iterative estimate and resource distribution determines that the most applicable pilot signal power comprises:

When launching at most symbolic number T in a packet and meeting M < T < 2M-1, the most applicable pilot signal power $P_{\mathrm{\&tau;}}^{\mathrm{opt}}=-\mathrm{\&eta;}-\sqrt{{\mathrm{\&eta;}}^2+\frac{\mathrm{PT}}{M}\mathrm{\&eta;}},$

In formula, P is statistics uniform emission power, procedure parameter transmitting pilot signal $\{s_1,s_2,...,s_M\}=\sqrt{P_{\mathrm{\&tau;}}^{\mathrm{opt}}}\underset{M\&times;M}{\left(\begin{array}{cccc}1& 0& \&CenterDot;& 0\\ 0& 1& \&CenterDot;& 0\\ \&CenterDot;& \&CenterDot;& \&CenterDot;& \&CenterDot;\\ 0& 0& \&CenterDot;& 1\end{array}\right)}M.$

According to the embodiment of the present invention, the described the most applicable matching relationship according to pilot tone iterative estimate and resource distribution determines that the most applicable pilot signal power comprises:

When launching at most symbolic number T in a packet and meeting T=2M-1, the most applicable pilot signal power in formula, P is statistics uniform emission power, procedure parameter transmitting pilot signal $\{s_1,s_2,...,s_M\}=\sqrt{P_{\mathrm{\&tau;}}^{\mathrm{opt}}}\underset{M\&times;M}{\left(\begin{array}{cccc}1& 0& \&CenterDot;& 0\\ 0& 1& \&CenterDot;& 0\\ \&CenterDot;& \&CenterDot;& \&CenterDot;& \&CenterDot;\\ 0& 0& \&CenterDot;& 1\end{array}\right)}M.$

According to the embodiment of the present invention, the described the most applicable matching relationship according to pilot tone iterative estimate and resource distribution determines that the most applicable pilot signal power comprises:

When launching at most symbolic number T in a packet and meeting T > 2M, the most applicable pilot signal power $P_{\mathrm{\&tau;}}^{\mathrm{opt}}=-\mathrm{\&eta;}+\sqrt{{\mathrm{\&eta;}}^2+\frac{\mathrm{PT}}{M}\mathrm{\&eta;}},$

In formula, P is statistics uniform emission power, procedure parameter transmitting pilot signal $\{s_1,s_2,...,s_M\}=\sqrt{P_{\mathrm{\&tau;}}^{\mathrm{opt}}}\underset{M\&times;M}{\left(\begin{array}{cccc}1& 0& \&CenterDot;& 0\\ 0& 1& \&CenterDot;& 0\\ \&CenterDot;& \&CenterDot;& \&CenterDot;& \&CenterDot;\\ 0& 0& \&CenterDot;& 1\end{array}\right)}M.$

According to the embodiment of the present invention, described link estimation unit utilizes and carries out link to the receiving matrix of pilot signal and estimate to comprise:

If communication terminal number is K in system, the link impulse response of arbitrary communication terminal k is wherein h _k=[h _k1, h _k2..., h _kM], white Gaussian noise n _k=[n _k1, n _k2..., n _kM], for the receiving matrix of pilot signal be:

$\begin{array}{c}[y_{k1},y_{k2},{...,y}_{\mathrm{kM}}]=h_k\{s_1,...,s_M\}+n_k\\ =\sqrt{P_{\mathrm{\&tau;}}^{\mathrm{opt}}}[h_{k1},h_{k2},...,h_{\mathrm{kM}}]\left(\begin{array}{cccc}1& 0& \&CenterDot;& 0\\ 0& 1& \&CenterDot;& 0\\ \&CenterDot;& \&CenterDot;& \&CenterDot;& \&CenterDot;\\ 0& 0& \&CenterDot;& 1\end{array}\right)+[n_{k1},n_{k2},...,n_{\mathrm{kM}}]\end{array}$

Obtaining link estimated result is communication terminal k link information:

$h_k^{\mathrm{est}}=[\widehat{h_{k1}},\widehat{h_{k2}},...,\widehat{h_{\mathrm{kM}}}]=\frac{1}{\sqrt{P_{\mathrm{\&tau;}}^{\mathrm{opt}}}}[y_{k1},y_{k2},...,y_{\mathrm{kM}}],$

Then to be come back to the base platform by feedback unit.

According to the embodiment of the present invention, the communication termination-link information that described communication terminal group selection unit returns according to communication terminal, carry out the selection of launching communication terminal group, specifically comprise:

Communication terminal group Γ is waited in S1, initialization ₁=1 ..., K}, selects first transmitting communication terminal arrange and launch communication terminal identification number i=2;

Communication terminal group is waited in S2, adjustment, ${\mathrm{\&Gamma;}}_i=\{k\&Element;{\mathrm{\&Gamma;}}_1:\frac{h_k^{\mathrm{est}}{\left(h_{\mathrm{\&pi;}\left(n\right)}^{\mathrm{est}}\right)}^{+}}{\left|h_k^{\mathrm{est}}{\left(h_{\mathrm{\&pi;}\left(n\right)}^{\mathrm{est}}\right)}^{+}\right|}<\mathrm{\&epsiv;},1\&le;n\&le;i-1\},$ Wherein ε=0.4, represent the link information of the n-th transmitting communication terminal;

S3, selection i-th transmitting communication terminal

Communication terminal identification number i=i+1 is launched in adjustment; If i < is M, perform S2;

S4, the transmitting communication terminal group finally determined for π (1) ..., π (M), the transmitting communication terminal number selected is equal with base station number of transmit antennas M;

According to the embodiment of the present invention, described signal transmitter unit also in notebook data bag for M selected transmitting communication terminal with system data power P _dlaunch T-M data symbol, described system data power $P_d=\frac{\mathrm{PT}-P_{\mathrm{\&tau;}}^{\mathrm{opt}}M}{T-M}.$

LTE self-adapting signal emission system of the present invention, on the basis of communication terminal scheduling considering many communication terminals LTE system link evaluated error and many communication terminals environment, according to the pilot tone iterative estimate of many communication terminals LTE capacity derivation LTE link and the most applicable matching relationship of resource distribution, and adopt the most applicable pilot signal power launch with the pilot signal of base station number of transmit antennas equal amount and carry out data transmitting, optimize the accuracy that link is estimated, improve the throughput performance of LTE link.

Accompanying drawing explanation

By reading hereafter detailed description of the preferred embodiment, various other advantage and benefit will become cheer and bright for those of ordinary skill in the art.Accompanying drawing only for illustrating the object of preferred implementation, and does not think limitation of the present invention, and in whole accompanying drawing, represents identical parts by identical reference symbol.In the accompanying drawings:

Figure 1 show the LTE self-adapting signal emission system structural representation according to embodiment of the present invention.

Embodiment

Below with reference to accompanying drawings illustrative embodiments of the present disclosure is described in more detail.Although show illustrative embodiments of the present disclosure in accompanying drawing, however should be appreciated that can realize the disclosure in a variety of manners and not should limit by the execution mode of setting forth here.On the contrary, provide these execution modes to be in order to more thoroughly the disclosure can be understood, and complete for the scope of the present disclosure can be conveyed to those skilled in the art.

According to the embodiment of the present invention, propose a kind of LTE self-adapting signal emission system, as shown in Figure 1, described system comprises: pilot signal power determining unit, signal transmitter unit, link estimation unit, feedback unit and communication terminal group selection unit, wherein

Described pilot signal power determining unit is under link Rayleigh fading condition, preset in a packet number of transmit antennas M launching at most symbolic number T and be greater than base station, the most applicable matching relationship according to pilot tone iterative estimate and resource distribution determines the most applicable pilot signal power

Described signal transmitter unit is with the most applicable described pilot signal power m pilot signal is launched to only having the communication terminal of a reception antenna;

Described link estimation unit utilizes and carries out link estimation to the receiving matrix of pilot signal;

Described feedback unit is used for link estimated result to come back to the base platform;

Described communication terminal group selection unit is not less than base station number of transmit antennas M based on communication terminal number K in predetermined system, according to the communication termination-link information that communication terminal returns, carries out the selection of launching communication terminal group;

Described signal transmitter unit also in notebook data bag for M selected transmitting communication terminal with system data power P _dlaunch T-M data symbol.

According to the embodiment of the present invention, the described the most applicable matching relationship according to pilot tone iterative estimate and resource distribution determines that the most applicable pilot signal power comprises:

When launching at most symbolic number T in a packet and meeting M < T < 2M-1, the most applicable pilot signal power $P_{\mathrm{\&tau;}}^{\mathrm{opt}}=-\mathrm{\&eta;}-\sqrt{{\mathrm{\&eta;}}^2+\frac{\mathrm{PT}}{M}\mathrm{\&eta;}},$

In formula, P is statistics uniform emission power, procedure parameter transmitting pilot signal $\{s_1,s_2,...,s_M\}=\sqrt{P_{\mathrm{\&tau;}}^{\mathrm{opt}}}\underset{M\&times;M}{\left(\begin{array}{cccc}1& 0& \&CenterDot;& 0\\ 0& 1& \&CenterDot;& 0\\ \&CenterDot;& \&CenterDot;& \&CenterDot;& \&CenterDot;\\ 0& 0& \&CenterDot;& 1\end{array}\right)}M.$

When launching at most symbolic number T in a packet and meeting T=2M-1, the most applicable pilot signal power in formula, P is statistics uniform emission power, procedure parameter transmitting pilot signal $\{s_1,s_2,...,s_M\}=\sqrt{P_{\mathrm{\&tau;}}^{\mathrm{opt}}}\underset{M\&times;M}{\left(\begin{array}{cccc}1& 0& \&CenterDot;& 0\\ 0& 1& \&CenterDot;& 0\\ \&CenterDot;& \&CenterDot;& \&CenterDot;& \&CenterDot;\\ 0& 0& \&CenterDot;& 1\end{array}\right)}M.$

When launching at most symbolic number T in a packet and meeting T > 2M, the most applicable pilot signal power $P_{\mathrm{\&tau;}}^{\mathrm{opt}}=-\mathrm{\&eta;}+\sqrt{{\mathrm{\&eta;}}^2+\frac{\mathrm{PT}}{M}\mathrm{\&eta;}},$

In formula, P is statistics uniform emission power, procedure parameter transmitting pilot signal $\{s_1,s_2,...,s_M\}=\sqrt{P_{\mathrm{\&tau;}}^{\mathrm{opt}}}\underset{M\&times;M}{\left(\begin{array}{cccc}1& 0& \&CenterDot;& 0\\ 0& 1& \&CenterDot;& 0\\ \&CenterDot;& \&CenterDot;& \&CenterDot;& \&CenterDot;\\ 0& 0& \&CenterDot;& 1\end{array}\right)}M.$

According to the embodiment of the present invention, described link estimation unit utilizes and carries out link to the receiving matrix of pilot signal and estimate to comprise:

If communication terminal number is K in system, the link impulse response of arbitrary communication terminal k is wherein h _k=[h _k1, h _k2..., h _kM], white Gaussian noise n _k=[n _k1, n _k2..., n _kM], for the receiving matrix of pilot signal be:

$\begin{array}{c}[y_{k1},y_{k2},{...,y}_{\mathrm{kM}}]=h_k\{s_1,...,s_M\}+n_k\\ \end{array}$

$\begin{array}{c}\\ =\sqrt{P_{\mathrm{\&tau;}}^{\mathrm{opt}}}[h_{k1},h_{k2},...,h_{\mathrm{kM}}]\left(\begin{array}{cccc}1& 0& \&CenterDot;& 0\\ 0& 1& \&CenterDot;& 0\\ \&CenterDot;& \&CenterDot;& \&CenterDot;& \&CenterDot;\\ 0& 0& \&CenterDot;& 1\end{array}\right)+[n_{k1},n_{k2},...,n_{\mathrm{kM}}]\end{array}$

Obtaining link estimated result is communication terminal k link information:

$h_k^{\mathrm{est}}=[\widehat{h_{k1}},\widehat{h_{k2}},...,\widehat{h_{\mathrm{kM}}}]=\frac{1}{\sqrt{P_{\mathrm{\&tau;}}^{\mathrm{opt}}}}[y_{k1},y_{k2},...,y_{\mathrm{kM}}],$

Then to be come back to the base platform by feedback unit.

According to the embodiment of the present invention, the communication termination-link information that described communication terminal group selection unit returns according to communication terminal, carry out the selection of launching communication terminal group, specifically comprise:

Communication terminal group Γ is waited in S1, initialization ₁=1 ..., K}, selects first transmitting communication terminal arrange and launch communication terminal identification number i=2;

Communication terminal group is waited in S2, adjustment, ${\mathrm{\&Gamma;}}_i=\{k\&Element;{\mathrm{\&Gamma;}}_i:\frac{h_k^{\mathrm{est}}{\left(h_{\mathrm{\&pi;}\left(n\right)}^{\mathrm{est}}\right)}^{+}}{\left|h_k^{\mathrm{est}}{\left(h_{\mathrm{\&pi;}\left(n\right)}^{\mathrm{est}}\right)}^{+}\right|}<\mathrm{\&epsiv;},1\&le;n\&le;i-1\},$ Wherein ε=0.4, represent the link information of the n-th transmitting communication terminal;

S3, selection i-th transmitting communication terminal

Communication terminal identification number i=i+1 is launched in adjustment; If i < is M, perform S2;

S4, the transmitting communication terminal group finally determined for π (1) ..., π (M), the transmitting communication terminal number selected is equal with base station number of transmit antennas M;

According to the embodiment of the present invention, described signal transmitter unit also for launching T-M data symbol for M selected transmitting communication terminal with system data power P d, described system data power in notebook data bag $P_d=\frac{\mathrm{PT}-P_{\mathrm{\&tau;}}^{\mathrm{opt}}M}{T-M}.$

The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection range of claim.

Claims (7)

1. a LTE self-adapting signal emission system, described system comprises: pilot signal power determining unit, signal transmitter unit, link estimation unit, feedback unit and communication terminal group selection unit, wherein,

Described pilot signal power determining unit is under link Rayleigh fading condition, preset in a packet number of transmit antennas M launching at most symbolic number T and be greater than base station, the most applicable matching relationship according to pilot tone iterative estimate and resource distribution determines the most applicable pilot signal power

Described signal transmitter unit is with the most applicable described pilot signal power m pilot signal is launched to only having the communication terminal of a reception antenna;

Described link estimation unit utilizes and carries out link estimation to the receiving matrix of pilot signal;

Described feedback unit is used for link estimated result to come back to the base platform;

Described communication terminal group selection unit is not less than base station number of transmit antennas M based on communication terminal number K in predetermined system, according to the communication termination-link information that communication terminal returns, carries out the selection of launching communication terminal group;

Described signal transmitter unit also in notebook data bag for M selected transmitting communication terminal with system data power P _dlaunch T-M data symbol.

2. a system as claimed in claim 1, the described the most applicable matching relationship according to pilot tone iterative estimate and resource distribution determines that the most applicable pilot signal power comprises:

When launching at most symbolic number T in a packet and meeting M < T < 2M-1, the most applicable pilot signal power

In formula, P is statistics uniform emission power, procedure parameter transmitting pilot signal

3. a system as claimed in claim 1, the described the most applicable matching relationship according to pilot tone iterative estimate and resource distribution determines that the most applicable pilot signal power comprises:

When launching at most symbolic number T in a packet and meeting T=2M-1, the most applicable pilot signal power in formula, P is statistics uniform emission power, procedure parameter transmitting pilot signal

4. a system as claimed in claim 1, the described the most applicable matching relationship according to pilot tone iterative estimate and resource distribution determines that the most applicable pilot signal power comprises:

When launching at most symbolic number T in a packet and meeting T > 2M, the most applicable pilot signal power

In formula, P is statistics uniform emission power, procedure parameter transmitting pilot signal

5. a system as claimed in claim 1, described link estimation unit utilization is carried out link to the receiving matrix of pilot signal and is estimated to comprise:

If communication terminal number is K in system, the link impulse response of arbitrary communication terminal k is wherein h _k=[h _k1, h _k2..., h _kM], white Gaussian noise n _k=[n _k1, n _k2..., n _kM], for the receiving matrix of pilot signal be:

Obtaining link estimated result is communication terminal k link information:

Then to be come back to the base platform by feedback unit.

6. a system as claimed in claim 1, the communication termination-link information that described communication terminal group selection unit returns according to communication terminal, carry out the selection of launching communication terminal group, specifically comprise:

Communication terminal group Γ is waited in S1, initialization ₁=1 ..., K}, selects first transmitting communication terminal arrange and launch communication terminal identification number i=2;

Communication terminal group is waited in S2, adjustment, wherein ε=0.4, represent the link information of the n-th transmitting communication terminal;

S3, selection i-th transmitting communication terminal

Communication terminal identification number i=i+1 is launched in adjustment; If i < is M, perform S2;

S4, the transmitting communication terminal group finally determined for π (1) ..., π (M), the transmitting communication terminal number selected is equal with base station number of transmit antennas M.

7. a system as claimed in claim 1, described signal transmitter unit in notebook data bag for M selected transmitting communication terminal with system data power P _dlaunch T-M data symbol, described system data power