Statistical bit allocation and statistical precoding for correlated mimo channels with decision feedback

Yuan-Pei Lin*, See May Phoong

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

In this letter, we jointly consider statistical precoding and statistical bit allocation for correlated MIMO channels. Given the statistics of the channel, we derive statistical BER bounds for high and low SNR ranges. Based on the BER bounds, statistical precoder and statistical bit allocation are designed. The statistical precoder helps to expose the statistical difference among the subchannels, which is then exploited by bit allocation. Moreover, we will incorporate bit allocation in determining detection ordering for the decision feedback receiver and present a suboptimal ordering for minimizing the worst subchannel error rate. The suboptimal solution can be implemented efficiently by modifying existing fast algorithms developed for uniform bit allocation. Although the statistical precoder and bit allocation are designed for high and low SNR ranges, very good performance can be achieved for all SNR. Simulations show that the performance of the proposed system is comparable to one that has instantaneous feedback rate of around 4 bits per channel.

Original languageEnglish
Article number6212312
Pages (from-to)761-764
Number of pages4
JournalIEEE Signal Processing Letters
Volume19
Issue number11
DOIs
StatePublished - 1 Oct 2012

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