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CN102843176A - Method and device for generating feedback information of terminal in MIMO (Multiple-Input Multiple-Output) system - Google Patents

Method and device for generating feedback information of terminal in MIMO (Multiple-Input Multiple-Output) system Download PDF

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Publication number
CN102843176A
CN102843176A CN2011101714999A CN201110171499A CN102843176A CN 102843176 A CN102843176 A CN 102843176A CN 2011101714999 A CN2011101714999 A CN 2011101714999A CN 201110171499 A CN201110171499 A CN 201110171499A CN 102843176 A CN102843176 A CN 102843176A
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channel
feedback information
matrix
obtains
feedback
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CN102843176B (en
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焦晓晓
朱登魁
陈艺戬
郁光辉
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

The invention relates to a method and a device for generating feedback information of a terminal in an MIMO (Multiple-Input Multiple-Output) system, wherein the method comprises the following steps: the terminal performs SVD (Singular Value Decomposition) and quantization on a channel coefficient according to received downlink data issued by a base station, so that the feedback information is obtained; and alternately, the feedback information is obtained via a mode that the channel noise and the interference power in three areas of channel bandwidth are calculated; and the device comprises a judging module, a channel coefficient feedback module and a channel noise and interference feedback module. With the adoption of the method and the device for generating feedback information of the terminal in the MIMO system, the feedback information amount is decreased, the user interference is effectively decreased, and the system performance is promoted.

Description

The terminal generates the method and the device of feedback information in the mimo system
Technical field
The present invention relates to wireless communication technology field, relate in particular to the method and the device of generation feedback information in terminal in a kind of MIMO ((Multiple-Input Multiple-Out-put), multiple-input and multiple-output) system.
Background technology
Multi-antenna technology is an important breakthrough of intelligent antenna technology in the wireless mobile communications field; This technology can improve the capability of communication system and the availability of frequency spectrum exponentially under the situation that does not increase bandwidth; Can also utilize multipath to alleviate multipath fading, and can eliminate channel disturbance effectively, improve the reliability of channel; Reducing the error rate, is the key technology that the third generation mobile communication system adopts.It has been widely used in LTE (Long Term Evolution, Long Term Evolution) and the WiMAX multiple wireless broadband system such as (World Interoperability for Microwave Access, World Interoperability for Microwave Access, WiMax).
Because the dramatic performance of wireless channel, in order to guarantee the transmission performance of mimo system, transmitting terminal must depend on the cognition to wireless channel conditions.So, can obtain and effectively utilize channel condition information exactly, the lifting of power system capacity there is crucial effects.
The development of feedback technique, feasible adaptive technique based on the channel prompting message becomes possibility.The feedback information of system through rl transmission low speed informed the relevant forward link information of transmitting terminal (channel condition information for example, received power, disturb rank etc.).Transmitting terminal sends strategy based on the feedback information adjustment that receives, and to adapt to forward link channel, guarantees communication quality.Generally speaking, to different system models and application scenarios, the content of feedback information also is not quite similar.Generally speaking; Feedback information depends primarily on terminal processes for the collaborative degree of dependence of transmitting terminal; When having more serious spatial interference, intersymbol interference, multi-user interference, the terminal can't oneself be handled to offset fully and disturbed, and just needs the transmitting terminal adjustment to send strategy; Adjust in the scope that to handle at the terminal in unfavorable factors such as transmitting terminal will disturb, increase the associated treatment of transmitting terminal and receiving terminal to greatest extent.These adjustment of doing at transmitting terminal need a large amount of link informations, and therefore, feedback information volume just has bigger increase.
In actual communication systems, because the increase of number of users and the use of many antennas, adopt the mode of unity feedback, promptly to feed back all attached channels information and can bring huge feedback quantity, the feedback channel transmission through resource-constrained is unpractical.Between the sensitivity characteristic of MIMO transmission for channel information; As how less feedback quantity; Guarantee that the reliability of transmission just becomes the center of Limited Feedback technical research; What feeds back, how to feed back, comprise that it all is these technological theoretical research categories that the what use is made of feedback information carries out problems such as user's selection scheduling.
Summary of the invention
The objective of the invention is to, the terminal generates feedback information in a kind of mimo system method and device are provided, disturb the elevator system performance in order to reduce the user.
The invention provides the method for generation feedback information in terminal in a kind of mimo system; After the downlink data that the base station issues is received at the terminal; Based on the flag that above-mentioned downlink data carries, judge that current channel feedback information is to confirm through channel coefficients, still confirm with disturbing through interchannel noise;
If confirm feedback information through channel coefficients, operation below then carrying out:
According to the auxiliary definite information in the above-mentioned downlink data, calculating channel coefficient;
Above-mentioned channel coefficients is carried out SVD (Singular Value Decomposition, singular value decomposition) decompose, and the data that decomposition obtains are quantized, obtain feedback information, above-mentioned feedback information is fed back to above-mentioned base station;
If confirm feedback information with disturbing through interchannel noise, operation below then carrying out:
According to preset division proportion, channel width is divided into the zone of three non-overlapping copies;
According to the auxiliary definite information in the above-mentioned downlink data, calculate the power of each regional channel disturbance and noise;
Power to obtaining quantizes respectively, obtains feedback information, and feeds back to above-mentioned base station.
Preferably, above-mentionedly channel coefficients is carried out SVD decompose, and the data that decomposition obtains are quantized, the feedback information step that obtains above-mentioned channel is specially:
If channel coefficient matrix is S, then S ∈ C M * n, wherein, m representes the antenna number at terminal, n is the antenna number of base station;
There is unitary matrice U ∈ C M * mWith V ∈ C N * n, make
S＝U∑V H
In the formula,
Σ = Σ 1 0 0 0
∑ 1=diag (σ 1σ 2... σ r), its diagonal element σ 1, σ 2..., σ rPut in order for:
σ 1≥σ 2≥...≥σ r≥0，r＝rank(S)
And
U＝[u 1u 2...u m]
V＝[v 1v 2...v n]
According to channel coefficients, confirm that current available independent channel counts k, k≤r;
Make i=1,2 ..., k takes out qualified element σ among matrix ∑, U, the V i, u iAnd v i
According to preset bit accuracy, to σ i, u iAnd v iQuantize, obtain the feedback information of above-mentioned channel.
Preferably, above-mentionedly channel coefficients is carried out SVD decompose, and the data that decomposition obtains are quantized, the feedback information step that obtains above-mentioned channel is specially:
If channel coefficient matrix is S, then S ∈ C M * n
Make Hermitian matrix A=SS H, have unitary matrice U ∈ C M * m, make
A＝SS H＝U∑ 2U H
In the formula,
Σ 2 = Σ 1 2 0 0 0
∑ 1 2=diag (σ 1 2σ 2 2... σ r 2), its diagonal element σ 1 2, σ 2 2..., σ r 2Put in order for:
σ 1 2≥σ 2 2≥...≥σ r 2≥0，r＝rank(A)
And
U＝[u 1u 2...u m]
According to channel coefficients, confirm that current available independent channel counts k, k≤r;
Make i=1,2 ..., k takes out the matrix ∑ 2, qualified element σ among the U i 2And u i
According to preset bit accuracy, to σ i 2And u iQuantize, obtain the feedback information of above-mentioned channel.
Preferably, above-mentionedly channel coefficients is carried out SVD decompose, and the data that decomposition obtains are quantized, the feedback information step that obtains above-mentioned channel is specially:
If channel coefficient matrix is S, then S ∈ C M * n
Make Hermitian matrix B=S HThere is unitary matrice V ∈ C in S N * n, make
B＝S HS＝V∑ 2V H
In the formula,
Σ 2 = Σ 1 2 0 0 0
∑ 1 2=diag (σ 1 2σ 2 2... σ r 2), its diagonal element σ 1 2, σ 2 2..., σ r 2Put in order for:
σ 1 2≥σ 2 2≥...≥σ r 2≥0，r＝rank(B)
And
V＝[v 1v 2...v n]
According to channel coefficients, confirm that current available independent channel counts k, k≤r;
Make i=1,2 ..., k takes out the matrix ∑ 2, qualified element σ among the V i 2And v i
According to preset bit accuracy, to σ i 2And v iQuantize, obtain the feedback information of above-mentioned channel.
Preferably, above-mentioned terminal is through the channel estimation calculation channel coefficients.
Preferably, when the i value not simultaneously, above-mentioned σ i, u iAnd v iHave the different quantized precision, when the i value is identical, above-mentioned σ i, u iAnd v iHave identical quantified precision, wherein, i=1,2 ..., k, k are current available independent channel number.
Preferably, when the i value not simultaneously, above-mentioned σ i 2And u iHave the different quantized precision, when the i value is identical, above-mentioned σ i 2And u iHave identical quantified precision, wherein, i=1,2 ..., k, k are current available independent channel number.
Preferably, when the i value not simultaneously, above-mentioned σ i 2And v iHave the different quantized precision, when the i value is identical, above-mentioned σ i 2And v iHave identical quantified precision, wherein, i=1,2 ..., k, k are current available independent channel number.
Preferably, it is in the matrix ∑ that above-mentioned current available independent channel is counted k, more than or equal to the σ of preset thresholding ε iNumber, wherein, i=1,2 ..., r.
Preferably, to count k be the matrix ∑ to above-mentioned current available independent channel 2In, more than or equal to the σ of preset thresholding ε i 2Number, wherein, i=1,2 ..., r.
Preferably, the zone of above-mentioned three non-overlapping copies is respectively left side band, middle band and the right band, wherein, above-mentioned in the middle of band in the above-mentioned channel width, remove the part behind above-mentioned left side band and the right band.
The present invention further provides the device of generation feedback information in terminal in a kind of mimo system, and said apparatus comprises judge module, channel coefficients feedback module and interchannel noise and interference feedback module,
Above-mentioned judge module is used for after the downlink data that the base station issues is received at the terminal, according to the flag that above-mentioned downlink data carries, judging that current channel feedback information is to confirm through channel coefficients, still confirms with disturbing through interchannel noise;
Above-mentioned channel coefficients feedback module is used for the auxiliary definite information according to above-mentioned downlink data, the calculating channel coefficient; Above-mentioned channel coefficients is carried out SVD decompose, and the data that decomposition obtains are quantized, obtain the feedback information of above-mentioned channel; Above-mentioned feedback information is fed back to above-mentioned base station;
Above-mentioned interchannel noise and interference feedback module are used for the channel width of above-mentioned channel being divided into the zone of three non-overlapping copies according to preset division proportion; According to the auxiliary definite information in the above-mentioned downlink data, calculate the power of each regional channel disturbance and noise; Power to obtaining quantizes respectively, obtains the feedback information of above-mentioned channel, and feeds back to above-mentioned base station.
Preferably, above-mentioned channel coefficients feedback module comprises that channel coefficients calculating sub module, SVD decompose submodule, quantize submodule and feedback submodule,
Above-mentioned channel coefficients calculating sub module is used for the auxiliary definite information according to above-mentioned downlink data, through the channel estimation calculation channel coefficients;
Above-mentioned SVD decomposes submodule, is used for that the channel coefficients that above-mentioned channel coefficients calculating sub module obtains is carried out SVD and decomposes;
Above-mentioned quantification submodule is used for according to preset quantified precision, above-mentioned SVD decomposition submodule is decomposed the result who obtains quantize, and obtains feedback information;
Above-mentioned feedback submodule is used for feedback information that above-mentioned quantification submodule is obtained, feeds back to the base station.
The present invention uses the different quantized precision that feedback information is quantized into different bit informations, has reduced feedback information volume, effectively reduces the user and disturbs, and has promoted systematic function.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes a part of the present invention, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, does not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of the embodiment one of the method that the terminal generates feedback information in the mimo system of the present invention;
Fig. 2 is the flow chart of the embodiment two of the method that the terminal generates feedback information in the mimo system of the present invention;
Fig. 3 is the theory diagram that the terminal generates the device of feedback information in the mimo system of the present invention.
Embodiment
In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearer, clear,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
As shown in Figure 1, be the flow chart of the embodiment one of the method that the terminal generates feedback information in the mimo system of the present invention, present embodiment specifically may further comprise the steps:
Step S001: user terminal receives the downlink data from the base station;
Step S002: user terminal through channel estimating, calculates the channel coefficients of current channel according to auxiliary definite information (like RS, information such as pilot tones) of carrying in the above-mentioned downlink data;
Step S003: above-mentioned channel coefficients is carried out SVD decompose;
According to channel coefficients, establishing channel coefficient matrix is S, then S ∈ C M * n, then this step can be decomposed through three kinds of modes, and first kind of mode is:
There is unitary matrice U ∈ C M * mWith V ∈ C N * n, make
S＝U∑V H
In the formula,
Σ = Σ 1 0 0 0
∑ 1=diag (σ 1σ 2... σ r), its diagonal element σ 1, σ 2..., σ rPut in order for:
σ 1≥σ 2≥...≥σ r≥0，r＝rank(S)
And
U＝[u 1u 2...u m]
V＝[v 1v 2...v n]
According to the matrix ∑, confirm that current available independent channel counts k, k≤r;
It is in the matrix ∑ that current available independent channel is counted k, more than or equal to the σ of preset thresholding ε i(i=1,2 ..., number r) for example can be selected ε=0.001.
Make i=1,2 ..., k takes out qualified element σ among matrix ∑, U, the V i, u iAnd v i
The second way is:
Make Hermitian matrix A=SS H, have unitary matrice U ∈ C M * m, make
A＝SS H＝U∑ 2U H
In the formula,
Σ 2 = Σ 1 2 0 0 0
∑ 1 2=diag (σ 1 2σ 2 2... σ r 2), its diagonal element σ 1 2, σ 2 2..., σ r 2Put in order for:
σ 1 2≥σ 2 2≥...≥σ r 2≥0，r＝rank(A)
And
U＝[u 1u 2...u m]
According to the matrix ∑ 2, confirm that current available independent channel counts k, k≤r;
It is the matrix ∑ that current available independent channel is counted k 2In, more than or equal to the σ of preset thresholding ε i(i=1,2 ..., number r) for example can be selected ε=0.001.
Make i=1,2 ..., k takes out the matrix ∑ 2, qualified element σ among the U i 2And u i
The third mode is:
Make Hermitian matrix B=S HThere is unitary matrice V ∈ C in S N * n, make
B＝S HS＝V∑ 2V H
In the formula,
Σ 2 = Σ 1 2 0 0 0
∑ 1 2=diag (σ 1 2σ 2 2... σ r 2), its diagonal element σ 1 2, σ 2 2..., σ r 2Put in order for:
σ 1 2≥σ 2 2≥...≥σ r 2≥0，r＝rank(B)
And
V＝[v 1v 2...v n]
According to the matrix ∑ 2, confirm that current available independent channel counts k, k≤r;
It is the matrix ∑ that current available independent channel is counted k 2In, more than or equal to the σ of preset thresholding ε i(i=1,2 ..., number r) for example can be selected ε=0.001.
Make i=1,2 ..., k takes out the matrix ∑ 2, qualified element σ among the V i 2And v i
Step S004: according to preset bit accuracy, and the data that decomposition obtains are quantized, obtain the feedback information of current channel;
If step S003 adopts first kind of mode to decompose, then this step is promptly to σ i, u iAnd v i(i=1,2 ..., k, k are available independent channel number) quantize;
If step S003 adopts the second way to decompose, then this step is promptly to σ i 2And u i(i=1,2 ..., k, k are available independent channel number) quantize;
If step S003 adopts the third mode to decompose, then this step is promptly to σ i 2And v i(i=1,2 ..., k, k are available independent channel number) quantize;
Among the present invention, each element for decomposition obtains all can be provided with the different quantized precision, for example, and with adopting first kind of mode to decompose the σ that obtains i, u i, v i(i=1,2 ..., the σ in k) 1, u 1, v 1Be quantified as the feedback information of 8bit, with σ 2, u 2, v 2Be quantified as the feedback information of 4bit; Decompose the σ that obtains with adopting the second way i 2, u i(i=1,2 ..., the σ in k) 1 2, u 1Be quantified as the feedback information of 8bit, σ 2 2, u 2Be quantified as the feedback information of 4bit; The third mode of employing is decomposed the σ that obtains i 2, v i(i=1,2 ..., the σ in k) 1 2, v 1Be quantified as the feedback information of 8bit, σ 2 2, v 2Be quantified as the feedback information of 4bit; Relatively to improve the precision of the good channel coefficients of channel condition.
Step S005: above-mentioned feedback information is fed back to above-mentioned base station;
After feedback information was received in the base station, strategy (as selecting suitable pre-coding matrix at transmitting terminal) was sent in adjustment, optimizes the transmission of downlink data.
As shown in Figure 2, be the flow chart of the embodiment two of the terminal of the present invention method that generates feedback information, present embodiment specifically may further comprise the steps:
Step S101: user terminal receives the downlink data from the base station;
Step S102:, the channel width of current channel is divided into the zone of three non-overlapping copies according to preset division proportion;
The zone of above-mentioned three non-overlapping copies is respectively left side band, middle band and the right band, and wherein, middle band is in the above-mentioned channel width, removes the part behind left side band and the right band.For example, if preset division proportion is 1: 8: 1, and the channel width of current channel is 10MHZ, and then left side band is 1MHZ, can be specially to comprise the relatively low frequency part of protecting frequency in the bandwidth; The right band is 1MHZ, can be specially to comprise the higher relatively frequency part of protecting frequency in the bandwidth, and middle band is remaining 8MHZ, can be specially not comprise the protection bandwidth, and near the frequency part frequency; If preset division proportion is 1: 6: 1, and the channel width of current channel is 20MHZ, and then left side band is 2.5MHZ, and middle band is 15MHZ, and the right band is 2.5MHZ.
Step S103: confirm information (like the information on the unloaded ripple etc.) based on auxiliary in the above-mentioned downlink data, calculate the power of each regional channel disturbance and noise;
In this step, the terminal can draw the interchannel noise and the interference power of subcarrier through the measuring receiver signal; Then, the channel disturbance and the noise power (as channel disturbance on the subcarrier and noise power are asked the average weighting etc. of perhaps being undertaken by preset rules) of left side band, middle band and the right band calculated at the terminal respectively.
Step S104: the power to obtaining quantizes respectively, obtains the feedback information of above-mentioned channel;
Step S105: above-mentioned feedback information is fed back to the base station.
After feedback information is received in the base station, judge channel situation according to feedback information, and adjustment transmission strategy (as pass through to regulate MCS (modulation and coding scheme, modulation coding mode) at transmitting terminal), optimize the transmission of downlink data.
As shown in Figure 3, be the theory diagram that the terminal generates the device of feedback information in the mimo system of the present invention; Present embodiment comprises judge module 01, channel coefficients feedback module 02 and interchannel noise and interference feedback module 03,
Judge module 01 is used for after the downlink data that the base station issues is received at the terminal, according to the flag that above-mentioned downlink data carries, judging that current channel feedback information is to confirm through channel coefficients, still confirms with disturbing through interchannel noise;
Channel coefficients feedback module 02 comprises that channel coefficients calculating sub module 21, SVD decompose submodule 22, quantize submodule 23 and feedback submodule 24,
Channel coefficients calculating sub module 21 is used for the auxiliary definite information according to downlink data, through the channel estimation calculation channel coefficients;
SVD decomposes submodule 22, and the channel coefficients that is used for that channel coefficients calculating sub module 21 is obtained carries out SVD and decomposes;
Quantize submodule 23, be used for, SVD decomposition submodule 22 is decomposed the result who obtains quantize, obtain feedback information according to preset quantified precision;
Feedback submodule 24 is used for feeding back to the base station with quantizing the feedback information that submodule 23 obtains.
Interchannel noise and interference feedback module 03 are used for channel width being divided into the zone of three non-overlapping copies according to preset division proportion; According to the auxiliary definite information in the downlink data, calculate the power of each regional channel disturbance and noise; Power to obtaining quantizes respectively, obtains the feedback information of above-mentioned channel, and feeds back to above-mentioned base station.
Above-mentioned explanation illustrates and has described the preferred embodiments of the present invention; But as previously mentioned; Be to be understood that the present invention is not limited to the form that this paper discloses, should do not regard eliminating as, and can be used for various other combinations, modification and environment other embodiment; And can in invention contemplated scope described herein, change through the technology or the knowledge of above-mentioned instruction or association area.And change that those skilled in the art carried out and variation do not break away from the spirit and scope of the present invention, then all should be in the protection range of accompanying claims of the present invention.

Claims (13)

1. the terminal generates the method for feedback information in the mimo system; It is characterized in that, after the downlink data that the base station issues is received at the terminal, the flag of carrying based on said downlink data; Judge that current channel feedback information is to confirm through channel coefficients, still confirm with disturbing through interchannel noise;
If confirm feedback information through channel coefficients, operation below then carrying out:
According to the auxiliary definite information in the said downlink data, calculating channel coefficient;
Said channel coefficients is carried out singular value SVD decompose, and the data that decomposition obtains are quantized, obtain feedback information, said feedback information is fed back to said base station;
If confirm feedback information with disturbing through interchannel noise, operation below then carrying out:
According to preset division proportion, channel width is divided into the zone of three non-overlapping copies;
According to the auxiliary definite information in the said downlink data, calculate the power of each regional channel disturbance and noise;
Power to obtaining quantizes respectively, obtains feedback information, and feeds back to said base station.
2. method according to claim 1 is characterized in that, saidly channel coefficients is carried out SVD decomposes, and the data that decomposition obtains are quantized, and the feedback information step that obtains said channel is specially:
If channel coefficient matrix is S, then S ∈ C M * n, wherein, m representes the antenna number at terminal, n is the antenna number of base station;
There is unitary matrice U ∈ C M * mWith V ∈ C N * n, make
S＝U∑V H
In the formula,
Σ = Σ 1 0 0 0
∑ 1=diag (σ 1σ 2... σ 1), its diagonal element σ 1, σ 2..., σ rPut in order for:
σ 1≥σ 2≥...≥σ r≥0，r＝rank(S)
And
U＝[u 1u 2...u m]
V＝[v 1v 2...v n]
According to the matrix ∑, confirm that current available independent channel counts k, k≤r;
Make i=1,2 ..., k takes out qualified element σ among matrix ∑, U, the V i, u iAnd v i
According to preset bit accuracy, to σ i, u iAnd v iQuantize, obtain the feedback information of said channel.
3. method according to claim 1 is characterized in that, saidly channel coefficients is carried out SVD decomposes, and the data that decomposition obtains are quantized, and the feedback information step that obtains said channel is specially:
If channel coefficient matrix is S, then S ∈ C M * n
Make Hermitian matrix A=SS H, have unitary matrice U ∈ C M * m, make
A＝SS H＝U∑ 2U H
In the formula,
Σ 2 = Σ 1 2 0 0 0
∑ 1 2=diag (σ 1 2σ 2 2... σ r 2), its diagonal element σ 1 2, σ 2 2..., σ r 2Put in order for:
σ 1 2≥σ 2 2≥...≥σ r 2≥0，r＝rank(A)
And
U＝[u 1u 2...u m]
According to the matrix ∑ 2, confirm that current available independent channel counts k, k≤r;
Make i=1,2 ..., k takes out the matrix ∑ 2, qualified element σ among the U i 2And u i
According to preset bit accuracy, to σ i 2And u iQuantize, obtain the feedback information of said channel.
4. method according to claim 1 is characterized in that, saidly channel coefficients is carried out SVD decomposes, and the data that decomposition obtains are quantized, and the feedback information step that obtains said channel is specially:
If channel coefficient matrix is S, then S ∈ C M * n
Make Hermitian matrix B=S HThere is unitary matrice V ∈ C in S N * n, make
B＝S HS＝V∑ 2V H
In the formula,
Σ 2 = Σ 1 2 0 0 0
∑ 1 2=diag (σ 1 2σ 2 2... σ r 2), its diagonal element σ 1 2, σ 2 2..., σ r 2Put in order for:
σ 1 2≥σ 2 2≥...≥σ r 2≥0，r＝rank(B)
And
V＝[v 1v 2...v n]
According to the matrix ∑ 2, confirm that current available independent channel counts k, k≤r;
Make i=1,2 ..., k takes out the matrix ∑ 2, qualified element σ among the V i 2And v i
According to preset bit accuracy, to σ i 2And v iQuantize, obtain the feedback information of said channel.
5. according to each described method of claim 1-4, it is characterized in that said terminal is through the channel estimation calculation channel coefficients.
6. method according to claim 2 is characterized in that, when the i value not simultaneously, said σ i, u iAnd v iHave the different quantized precision, when the i value is identical, said σ i, u iAnd v iHave identical quantified precision, wherein, i=1,2 ..., k, k are current available independent channel number.
7. method according to claim 3 is characterized in that, when the i value not simultaneously, said σ i 2And u iHave the different quantized precision, when the i value is identical, said σ i 2And u iHave identical quantified precision, wherein, i=1,2 ..., k, k are current available independent channel number.
8. method according to claim 4 is characterized in that, when the i value not simultaneously, said σ i 2And v iHave the different quantized precision, when the i value is identical, said σ i 2And v iHave identical quantified precision, wherein, i=1,2 ..., k, k are current available independent channel number.
9. according to claim 2 or 6 described methods, it is characterized in that it is in the matrix ∑ that said current available independent channel is counted k, more than or equal to the σ of preset thresholding ε iNumber, wherein, i=1,2 ..., r.
10. according to claim 3,4,7,8 each described methods, it is characterized in that it is the matrix ∑ that said current available independent channel is counted k 2In, more than or equal to the σ of preset thresholding ε i 2Number, wherein, i=1,2 ..., r.
11., it is characterized in that the zone of said three non-overlapping copies is respectively left side band, middle band and the right band based on the described method of claim 1, wherein, said in the middle of band in the said channel width, remove the part behind said left side band and the right band.
12. the terminal generates the device of feedback information in the mimo system, it is characterized in that said device comprises judge module, channel coefficients feedback module and interchannel noise and interference feedback module,
Said judge module is used for after the downlink data that the base station issues is received at the terminal, according to the flag that said downlink data carries, judging that current channel feedback information is to confirm through channel coefficients, still confirms with disturbing through interchannel noise;
Said channel coefficients feedback module is used for the auxiliary definite information according to said downlink data, the calculating channel coefficient; Said channel coefficients is carried out SVD decompose, and the data that decomposition obtains are quantized, obtain the feedback information of said channel; Said feedback information is fed back to said base station;
Said interchannel noise and interference feedback module are used for the channel width of said channel being divided into the zone of three non-overlapping copies according to preset division proportion; According to the auxiliary definite information in the said downlink data, calculate the power of each regional channel disturbance and noise; Power to obtaining quantizes respectively, obtains the feedback information of said channel, and feeds back to said base station.
13. device according to claim 12 is characterized in that, said channel coefficients feedback module comprises that channel coefficients calculating sub module, SVD decompose submodule, quantize submodule and feedback submodule,
Said channel coefficients calculating sub module is used for the auxiliary definite information according to said downlink data, through the channel estimation calculation channel coefficients;
Said SVD decomposes submodule, is used for that the channel coefficients that said channel coefficients calculating sub module obtains is carried out SVD and decomposes;
Said quantification submodule is used for according to preset quantified precision, said SVD decomposition submodule is decomposed the result who obtains quantize, and obtains feedback information;
Said feedback submodule is used for feedback information that said quantification submodule is obtained, feeds back to the base station.
CN201110171499.9A 2011-06-23 2011-06-23 Method and device for generating feedback information of terminal in MIMO (Multiple-Input Multiple-Output) system Expired - Fee Related CN102843176B (en)

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