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Multi-user precoding robust construction method under explicit delayed feedback

A precoding and multi-user technology, applied in diversity/multi-antenna systems, space transmit diversity, digital transmission systems, etc., can solve problems such as unsatisfactory performance, and achieve optimal system BER performance, high channel capacity, and large system transmission The effect of capacity

Inactive Publication Date: 2011-06-15
SOUTHEAST UNIV
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Problems solved by technology

In practical systems where there are both quantization errors and delays, these beamforming schemes usually cannot achieve satisfactory performance

Method used

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  • Multi-user precoding robust construction method under explicit delayed feedback
  • Multi-user precoding robust construction method under explicit delayed feedback
  • Multi-user precoding robust construction method under explicit delayed feedback

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Embodiment Construction

[0053] The MIMO precoding scheme proposed by the present invention is a transmission scheme implemented on the premise that the number of base station antennas is equal to the number of users. Before implementation, it is also necessary to investigate the average moving speed of users served by the base station to calculate the channel delay correlation coefficient from the base station to the user. Before transmitting data, the user estimates downlink channel information and feeds it back to the base station. The base station calculates the precoding on the premise of knowing the quantized channel information and the delay coefficient matrix.

[0054] 1) The base station first obtains the average mobile rate of each user through research, and calculates the delay coefficient of each user through the rate to form a delay coefficient diagonal matrix ;

[0055] 2) The base station uses the Lloyd algorithm (see literature [GERSHO1992]: GERSHO A., GRAY R.M.: ‘Vector quantizatio...

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Abstract

The invention provides a multi-user precoding robust construction method under explicit delayed feedback, which is suitable for the multi-user parallel transmission based on the explicit feedback in a wireless multi-antenna transmission system. The method comprises the step that a base station researches all users serviced by the base station to obtain the mean motion speed of each user, computes the Doppler translation of each user according to the speed, computes the time-lapse related coefficient of each user according to a Clark scattering model, forms a delayed coefficient matrix, and substitutes the quantitative channel information fed back by a plurality of user sides and the obtained delayed coefficient matrix into a robust precoding construction formula provided by the method to obtain the precoding. The implementation process of the method in the practical application comprises the steps: 1) channel estimation; 2) delayed feedback; and 3) robustness precoding computation. The application efficiency can be higher if the precoding construction scheme provided by the method is adopted.

Description

technical field [0001] The invention relates to the design of a transmission preprocessing scheme in a multi-antenna multi-user system, and belongs to the technical scheme field of transmission preprocessing in a multi-user MIMO system. Background technique [0002] Compared with the single-input single-output system (SISO), the multiple-input multiple-output (MIMO) system can use appropriate preprocessing techniques to achieve higher total system capacity and reliability. In MIMO broadcasting systems, a nonlinear precoding technique called Dirty Paper Coding (DPC) has been proven to achieve the optimal capacity of the system. However, due to the complexity of the DPC technical scheme, it is difficult to realize the actual communication system so far. At the same time, some suboptimal precoding schemes, such as zero-forcing (ZF) beamforming schemes, orthogonal random (OR) beamforming schemes, and minimum mean square error (MMSE) precoding schemes, etc., have less computatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L1/00H04B7/06H04B7/08
Inventor 许威戴斌斌赵春明
Owner SOUTHEAST UNIV
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