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Multi antenna channel feedback method based on instantaneous and statistic channel information

A technology for statistical channel information and channel feedback, applied in the field of high-speed wireless communication transmission, can solve the problems of small system capacity, large amount of information, and small amount of feedback information

Inactive Publication Date: 2007-11-21
SOUTHEAST UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

In the process of engineering implementation, the factor that determines the capacity of a closed-loop multi-antenna transmission scheme is the amount of channel information fed back. If the transmitter knows all channel information, the optimal power water injection method can be used to obtain a very high System capacity, its disadvantage is the large amount of information that needs to be fed back
Conversely, the system capacity obtained by adopting the method with less amount of feedback information is also less
In addition, the movement of the mobile terminal, the delay of the feedback information and the feedback error will reduce the capacity of the multi-antenna system. Therefore, how to design a good performance and robust multi-antenna channel feedback method is a topic that needs further research

Method used

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  • Multi antenna channel feedback method based on instantaneous and statistic channel information
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  • Multi antenna channel feedback method based on instantaneous and statistic channel information

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Embodiment Construction

[0045] Concrete implementation process of the present invention is as follows:

[0046] 1. The receiver uses the pilot sequence with relatively good orthogonality to estimate the channel matrix using the MMSE method, which is expressed as

[0047] Y=H(t-k)S+Nt (Formula 8)

[0048] Here Y, S and N t They are M×P dimensional received signal matrix, N×P dimensional pilot symbol matrix and M×P dimensional noise matrix, where P is the number of pilot sequences in time. Then the estimation method of the channel matrix is:

[0049] H ( t - k ) = YS H ( SS H + σ n 2 I N ) - ...

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Abstract

The multi-antenna channel feedback method based on two modes of transient and statistic channel information feedback improves communication data ratio, reduces feedback information of multi-antenna channel, and increases robustness of multi-antenna system. Wherein, selecting feedback manner according to Doppler frequency of mobile terminal and SNR of feedback link; for transient feedback, making every sub-frame feedback one time as transient channel format; for statistic feedback, making multiple sub-frames feedback one time as statistic channel format; for statistic channel information, calculating and compressing the statistic channel, calculating the number of data stream, predicting the channel information, and correcting feedback error; for transient channel information, adaptive coding and modulating the data stream, and mapping to opposite emission orthogonal basis.

Description

technical field [0001] The invention relates to a technical method for increasing the wireless communication data rate, reducing the feedback information of multi-antenna channels and improving the robustness of the multi-antenna system, and belongs to the technical field of high-speed wireless communication transmission. Background technique [0002] The current and upcoming wireless communication requires a data rate of up to 50 Mbps and a downlink of 100 Mbps, and the requirements for spectral efficiency are relatively high. Simply increasing the transmission power is no longer able to meet the requirements of future wireless communications, so the multi-antenna technology based on multi-antenna transmission and multi-antenna reception has begun to be applied. Theory and experiments have proved that under the condition of spatially uncorrelated channels, a multi-antenna system with the same transmission power as a single-antenna system can double the spectral efficiency o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L1/00H04B7/04
Inventor 王炎尤肖虎
Owner SOUTHEAST UNIV