PRECODING AND DECODING DESIGN FOR TWO-WAY MIMO AF MULTIPLE-RELAY SYSTEM  

作　　者：Zhi Hui Yang Longxiang Zhu Hongbo 

机构地区：[1]Jiangsu Key Lab of Wireless Communication,Nanjing University of Posts and Telecommunications,Nanjing 210003,China

出　　处：《Journal of Electronics(China)》2012年第3期177-189,共13页电子科学学刊（英文版）

基　　金：Supported by the National Science and Technology Specific Project (2011ZX03005-004-003);the National Natural Science Foundation of China (No. 61071090, 61171093);973 Project of Jiangsu Province (BK2011027);the Project 11KJA510001 and PAPD;the Jiangsu Postgraduate Research Project (CXZZ11_0384)

摘　　要：In this paper, a joint precoding and decoding design scheme is proposed for two-way Multiple-Input Multiple-Output (MIMO) multiple-relay system. The precoding and decoding matrices are jointly optimized based on Minimum Mean-Square-Error (MMSE) criteria under transmit power constraints. The optimization problem is solved by using a convergent iterative algorithm which in-cludes four sub-problems. It is shown that due to the difficulty of the block diagonal nature of the relay precoding matrix, sub-problem two cannot be solved with existing methods. It is then solved by converting sub-problem two into a convex optimization problem and a simplified method is proposed to reduce the computational complexity. Simulation results show that the proposed scheme can achieve lower Bit Error Rate (BER) and larger sum rate than other schemes. Furthermore, the BER and the sum rate performance can be improved by increasing the number of antennas for the same number of relays or increasing the number of relays for the same number of antennas.In this paper, a joint precoding and decoding design scheme is proposed for two-way Multiple-Input Multiple-Output （MIMO） multiple-relay system. The precoding and decoding matrices are jointly optimized based on Minimum Mean-Square-Error （MMSE） criteria under transmit power constraints. The optimization problem is solved by using a convergent iterative algorithm which in- cludes four sub-problems. It is shown that due to the difficulty of the block diagonal nature of the relay precoding matrix, sub-problem two cannot be solved with existing methods. It is then solved by converting sub-problem two into a convex optimization problem and a simplified method is proposed to reduce the computational complexity. Simulation results show that the proposed scheme can achieve lower Bit Error Rate （BER） and larger sum rate than other schemes. Furthermore, the BER and the sum rate performance can be improved by increasing the number of antennas for the same number of relays or increasing the number of relays for the same number of antennas.

关 键 词：Precoding and decoding design Iterative algorithm Two-way relaying Bit Error Rate (BER) Sum rate 

分 类 号：TN92[电子电信—通信与信息系统]