多天线双向中继系统中的中继处理与资源分配策略 - 电子与信息学报.PDF

第 32 卷第 4 期 电 子 与 信 息 学 报 Vol.32No.4 2010 年 4 月 Journal of Electronics Information Technology Apr. 2010 多天线双向中继系统中的中继处理与资源分配策略 赵 睿①② 傅友华① 李春国① 杨绿溪① ①(东南大学信息科学与工程学院 南京 210096) ②(华侨大学信息科学与工程学院 泉州 362021) 摘 要：该文在多天线放大转发双向中继系统中，根据最小和均方误差(MSMSE)准则，以较小的复杂度得到了 MSE 最优的中继处理矩阵的闭合表达式。为综合利用空域和频域分集，探讨了 OFDM 双向中继系统的资源分配 策略，提出了实现复杂度低的分层子载波配对策略和功率优化分配策略。仿真结果显示，所设计的中继处理策略在 系统和速率和误码率性能上均明显优于其他双向中继策略，且性能随着中继天线数的增加而提升；结合功率分配的 分层子载波配对策略能明显提升系统和速率，性能接近最优策略。 关键词：通信网络；双向中继；放大转发；均方误差；子载波配对；功率分配 中图分类号：TN92 文献标识码：A 文章编号：1009-5896(2010)04-0763-07 DOI: 10.3724/SP.J.1146.2009.00542 Relay Processing and Resource Allocation Strategies for Multi-antenna Two-Way Relay System ①② ① ① ① Zhao Rui Fu You-hua Li Chun-guo Yang Lu-xi ① (School of Information Science and Engineering, Southeast University, Nanjing 210096, China) ② (College of information Science and Engineering, Huagiao University, Quanzhou 362021, China) Abstract: In multi-antenna amplify-and-forward two-way relay system, the closed form expression of the MSE optimal relay processing matrix with low complexity based on Minimum Sum Mean Square Error (MSMSE) criterion is derived. To utilize the spatial diversity and frequency diversity comprehensively, the resource allocation strategy in OFDM two-way relay system is investigated, and the layered subcarrier pairing with low complexity and power optimized allocation strategy is proposed. Simulation results show that, the proposed relay processing scheme outperforms other two-way relaying schemes in the performances of system sum rate and bit err