多用户环境下TH-UWB系统的盲Rake接收机

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.

Blind Rake receiver for TH-UWB systems with multi-user interference

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.