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多用户环境下TH-UWB系统的盲Rake接收机

Blind Rake receiver for TH-UWB systems with multi-user interference
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摘要 针对跳时超宽带系统中的多用户干扰和码间干扰问题,提出了一种盲Rake接收机.该接收机首先利用跳时码的良好相关性设计滤波器,消除部分多用户干扰和码间干扰;再对滤波器的输出数据采用紧缩近似投影子空间跟踪方法估计信道,并进行最大比合并,进一步提高输出信干噪比.仿真结果表明,这种接收机收敛速度较快,误码性能优于传统的相关接收机和Rake接收机,且其所需先验知识较少、计算复杂度较低. A novel blind Rake receiver is proposed in order to suppress both multi-user interference(MUI) and inter symbol interference(ISI) for time-hopping ultra-wideband(TH-UWB) systems.The receiver firstly exploits the properties of the desired user time-hopping sequence to figure out a filter for eliminating partial MUI and ISI,and then uses the PASTd algorithm to estimate the channel and perform maximal ratio combining(MRC) to further improve the signal to interference plus noise ratio(SINR).Simulation results show that the proposed blind Rake receiver achieves a significant performance gain in comparison with the conventional receiver and Rake receiver,and can converge at the steady state rapidly.Furthermore,it requires less priori knowledge and has lower complexity.
出处 《西安电子科技大学学报》 EI CAS CSCD 北大核心 2012年第2期12-16,65,共6页 Journal of Xidian University
基金 国家杰出青年科学基金资助项目(60725105) 国家重点基础研究发展计划(973计划)资助项目(2009CB320404) 长江学者和创新团队发展计划资助项目(IRT0852) 陕西省教育厅科研计划资助项目(2010JK666)
关键词 超宽带 跳时 多用户干扰 紧缩近似投影子空间跟踪 ultra-wideband(UWB) time hopping(TH) multi-user interference(MUI) projection approximation subspace tracking with deflation(PASTd)
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