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A Limited Feedback-Based Interference Alignment Algorithm to Maximize the Rate Lower Bound in Interfering MIMO-MAC
XIE Xian-zhong, ZHANG Sen-lin, NIE Jun-mei, LEI Wei-jia
ACTA ELECTRONICA SINICA ›› 2017, Vol. 45 ›› Issue (3) : 662-668.
PDF(1628 KB)
PDF(1628 KB)
A Limited Feedback-Based Interference Alignment Algorithm to Maximize the Rate Lower Bound in Interfering MIMO-MAC
We propose a new code word selected scheme that directly selects code words to maximize the rate lower bound and combine bit allocation algorithm to reduce the sum rate loss,which is based on analyzing the disadvantages of the traditional limited feedback interference alignment scheme in two-cell interfering MIMO-MAC. Meanwhile,we adopt MAX-SINR criterion to decode the target signal. Unlike the traditional limited feedback schemes which are based on minimum chordal distance or alignment degree criterion,we select optimized code words from the perspective of maximizing the rate lower bound. Further,we generate the sets of code words which are close to perfect precoder,and select the optimized code words in these sets through low complexity and suboptimal global searching. The simulation results verify that the proposed algorithm effectively improves the performance of system and improves the rate lower bound compared with the existing typical algorithms.
interference alignment / MIMO-MAC / limited feedback / maximizing the rate lower bound / code words selected / bit allocation {{custom_keyword}} /
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