Optimization and Performance Analysis of Zero Forcing Decision Feedback Detector for MIMO Block-Fading Channels with Per-Antenna Power Control

In multiple-input multiple-output (MIMO) antenna systems, the zero forcing decision feedback detector (ZF-DFD) is used to recover transmit signals. In this paper, we propose a per-antenna power control (PAPC) scheme based on ZF-DFD for MIMO block-fading channels. The optimal power controlled ZF-DFD can minimize the block error rate (BLER) and maximize the lower bound of the channel’s free distance at high signal-to-noise ratio (SNR) region subject to a power constraint. Additionally, the optimal power controlled ZF-DFD can achieve this BLER performance without any ordering operation at the receiver. The performance analysis among the conventional ZF-DFD without feedback, the optimal power controlled ZF-DFD with power feedback, and the ZF-DFD with full channel state information feedback shows that the optimal ZF-DFD achieves a tradeoff between performance and feedback overhead. We compare the bit error rate (BER) and BLER performance of the optimal ZF-DFD with other detectors without power feedback by simulation. In simulations, the execution times required by these detectors are also reported to compare their complexity. It comes straight that the optimal power controlled ZF-DFD proposed in this paper can achieve good performance with small feedback overhead and have low complexity. Kun Zhao was born in Hefei, China, on 9 October 1979. He received his BS and MS degrees from University of Science and Technology of China (USTC), in 2001 and 2003, all in Electrical Engineering. He is now a Ph.D. candidate at USTC.His research interests are in the area of spread spectrum and CDMA communications, radio resource management in mobile communications, space-time signal processing and multiuser MIMO. Ling Qiu received her BS degree from Southeast University, P. R. China, in 1990. She also received MS and Ph.D. degrees from University of Science and Technology of China (USTC), in 1997 and 1999, all in Electrical Engineering.From 1990 to 1994, she was an engineer in the Institute of Nanjing Electronic Technology. In 1999, she joined the Department of Electronic and Engineering and Information Science, USTC as a lecturer. Since 2002, she has been an Associate Professor. She is a coauthor of two books and over 40 conference/journal papers. Her research interests are in the area of wireless communications, spread spectrum and CDMA communications, wireless access networks and protocols, radio resource management in mobile communications, space-time signal processing and multiuser MIMO. Jinkang Zhu is a professor of Department of Electronic Engineering & Information Science of University of Science and Technology of China (USTC). Now he is director of Personal Communication Network and Spread Spectrum Lab. of USTC, Chair of the Academic Committee of School of Information Science & Technology of USTC, Vice-Chiar of the Academic Committee of USTC.He was Permanent V-President of School of Information Science & Technology of USTC, Chairman of PCN Experts Group of Communication Project of National R & D on High-Technology Programme of China, Member of Information Technology Expert Group of the Chinese Academy of Sciences, Member (Representation of China Mainland) of Technical Forum on Wireless Communications of Asia Pacific Region, Member of Technical Advisory Committee of IEEE VTC'99 Fall, Member of Technical Program Committee of IEEE VTC'2000, Member of Technical Program Committee of SCI'2001.His research area is Wireless and Mobile Communications, CDMA and Spread Spectrum Communications, Signal Process of Communications, and Wireless Networks. He got two awards of Ministry of Science & Technology of China, three awards of Chinese Academy of Science. He published five books and 100 papers, where synchronous CDMA method proposed is used in TD-SCDMA Standard of 3G as basic technology.