A MIMO system with finite-bit feedback based on fixed constellations  

作　　者：WANG HaiQuan ZHAO ZhiJin 

机构地区：[1]School of Communications Engineering,Hangzhou Dianzi University

出　　处：《Science China(Information Sciences)》2013年第6期21-34,共14页中国科学（信息科学）（英文版）

基　　金：supported by National Natural Science Foundation of China (Grant Nos. 60972049,60872092);Natural Science Foundations of Zhejiang Province (Grant No. Y1090846);Scientific Research Foundation forReturned Scholars,Ministry of Education of China

摘　　要：In this paper,a MIMO system with finite-bit feedback based on fixed constellations is considered.Based on performance analysis of the system,an optimal operating system with maximum-likelihood decoding is demonstrated.Surprisingly,this operation reveals that the optimal way for the system to transmit signals needs to invoke the multimode scheme.We propose designing criteria for this scheme and methods for pre-codebooks,and a method to determine the number of modes for any specific channel.Furthermore,to reduce encoding complexity at the receiver side,we also develop a fast encoding algorithm.Theoretical analysis and simulations show that the proposed systems offer considerable gain over existing systems.Moreover,these systems also have much lower encoding complexity.Indeed,for the case of a MIMO system with two pairs of transmitting and receiving antennas,a properly designed system with a transmission rate of 8 bits per channel use and with 6-bit feedback can provide about a 1.5 dB performance gain over a beamforming system.In this paper,a MIMO system with finite-bit feedback based on fixed constellations is considered.Based on performance analysis of the system,an optimal operating system with maximum-likelihood decoding is demonstrated.Surprisingly,this operation reveals that the optimal way for the system to transmit signals needs to invoke the multimode scheme.We propose designing criteria for this scheme and methods for pre-codebooks,and a method to determine the number of modes for any specific channel.Furthermore,to reduce encoding complexity at the receiver side,we also develop a fast encoding algorithm.Theoretical analysis and simulations show that the proposed systems offer considerable gain over existing systems.Moreover,these systems also have much lower encoding complexity.Indeed,for the case of a MIMO system with two pairs of transmitting and receiving antennas,a properly designed system with a transmission rate of 8 bits per channel use and with 6-bit feedback can provide about a 1.5 dB performance gain over a beamforming system.

关 键 词：beamforming fixed constellations finite-bit feedback MULTIPLE-INPUT multiple-output systems space-time coding union bound 

分 类 号：TN919.3[电子电信—通信与信息系统]