张平. Beyond 3G移动通信系统关键技术[J]. 北京邮电大学学报, 2002, 25(3): 1-6. Zhang Ping. Some research issues for beyond 3G mobile systems[J]. Journal of Beijing University of Posts and Telecommunications, 2002, 25(3): 1-6. [2] Barbero L G, Thompson J S. Performance analysis of a fixed-complexity sphere decoder in high-dimensional MIMO systems//ICASSP 2006. Toulouse: , 2006: 14-19. [3] Jalden J, Barbero L G, Ottersten B, et al. The error probability of the fixed-complexity sphere decoder[J]. IEEE Trans on Signal Process, 2007, 55(7): 5477-5484. [4] Xiong Cong, Zhang Xin, Wu Kai, et al. A simplified fixed-complexity sphere decoder for V-BLAST systems[J]. IEEE Commun Lett, 2009, 13(8): 582-586. [5] Wu Xiang, Thompson J S, Wallace A M. An improved sphere decoding scheme for MIMO systems using as adaptive statistical threshold//EUSIPCO 2009. Glasgow: , 2009: 2668-2672.