基于优化比特分配的有限反馈干扰对齐方案

doi:10.11959/j.issn.1000-436x.2017215

Abstract

Abstract:

A novel limited feedback for interference alignment algorithm was proposed based on the disadvantages of traditional limited feedback interference alignment schemes for MIMO uplink.Unlike the traditional linear interference alignment,an iterative scheme was presented.The pre-coder was designed through maximizing the target signal to the interference leakage and noise ratio,and interference suppression matrix was designed by maximizing the signal to interference plus noise ratio for each data stream,which can come over rate loss in low SNR.In addition,the bit allocation of traditional limited feedback schemes were based on the mean of interference leakage,which were not perfect and make the total number of the effective bits less than the bits provided by system.Thus,a novel bit allocation scheme was provided that improving bit utilize and decreasing quantization error.Theoretical analysis and simulation experiments show that compare to the existed classical algorithms,the algorithm was a stepwise enhancement of signal quality for iterative search in perfect CSI which was better than linear algorithm and has a larger space with no need for strictly align interference in limited feedback CSI which reduces the influence of quantization error more.The effective bit distribution and bit utilization are improved by bit allocation,resulting in improved performance in limited feedback.

Key words: interference alignment, limited feedback, bit allocation, quantization error, bit utilization

CLC Number:

TN929.53

Xian-zhong XIE,Dan LI,Wei-jia LEI,Sen-lin ZHANG. Interference alignment based on optimizing bit allocation with limited feedback in interfering MIMO-MAC networks[J]. Journal on Communications, 2017, 38(11): 1-12.

Figures/Tables 11

预置反馈比特数	最佳码字索引	有效反馈比特数	量化弦距离
$b_{preset}^{1}$	$i n d e x_{1}$	$b_{effective}^{1}$	$I_{chordal}^{1}$
$b_{preset}^{2}$	$i n d e x_{2}$	$b_{effective}^{2}$	$I_{chordal}^{2}$
…	…	…	…
$b_{preset}^{n}$	$i n d e x_{n}$	$b_{effective}^{n}$	$I_{chordal}^{n}$
…	…	…	…

References 21

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