码片均衡多径干扰抵消联合接收机

Combined chip equalization multi-path interference cancellation receiver

研究了低扩频比下如何提高数据传输系统性能的问题 ,提出了一种新的线性码片均衡与非线性干扰抵消相级连结构即RLS MPIC结构 ,并给出了导频抵消码片均衡算法 (PC MRLS) .PC MRLS算法抑制了导频干扰 ,为MPIC提供了较好的初始判决值 ;MPIC对均衡后多径信号进行抑制 ,进一步提高了系统的性能 .理论分析与计算机模拟结果表明 ,RLS MPIC接收机与传统的Rake接收机、码片均衡器以及多级干扰抵消接收机相比 ,在性能上有较大的改善 .

In order to enhance the performance of the high-speed packet transmission in low spreading factor, a new structure of chip equalizer RLS-MPIC (recursive least squares chip equalizer and multi-path parallel interference canceller) is presented, which combines the linear chip equalizer with nonlinear multi-path interference cancellation. The algorithm PC-MRLS (pilot cancellation modified recursive least squares algorithm) is proposed based on pilot cancellation. PC-MRLS suppresses the pilot interference and gains a good early decision result for MPIC. MPIC cancels the multi-path signal after equalization and improves the performance of the system. Theoretic analysis and computer simulations show that the new structure is superior to conventional Rake, chip equalizer and multistage multi-path interference cancellation receiver.