改进的部分并行干扰抵消多用户检测  

Improved Partially Parallel Interference Cancellation in Multi-User Detection

作　　者：吴边[1] 许宗泽[1] 

机构地区：[1]南京航空航天大学信息科学与技术学院,南京210016

出　　处：《南京航空航天大学学报》2004年第3期392-397,共6页Journal of Nanjing University of Aeronautics & Astronautics

摘　　要：给出了一种用于部分并行干扰抵消多用户检测新的判决函数 :WSGN判决函数。根据较好的多用户干扰估计能提高误码率性能这一原理 ,本文推导出这种新函数。它考虑了门限的作用 ,使得不当门限对其性能的负面影响小于其他判决函数。在瑞利衰落信道中分析了使用这种判决函数的部分并行干扰抵消检测方法的误码率性能。结果表明 ,这种新的检测方法误码率性能可以收敛到单用户检测 ;并且性能优于一般匹配滤波器检测方法和其他部分并行干扰抵消检测方法。此外其计算复杂度没有显著增加 ,可以用于实际的A new decision function named the WSGN function is given for partially parallel interference cancellation (PPIC) in multi-user detection. Based on the principle in which the exact multi-user interference estimate can improve the bit-error-rate (BER) performance, this new function is deduced. Considering the threshold effect, and the negative influence of the improper threshold on BER is insignificant compared with other decision functions. The BER performance of the PPIC detection method using WSGN function in a Rayleigh channel is analyzed. Result shows that the BER performance can be converged to a single user detection, and it is better than that of the matched filter detection method and PPIC detection methods using other decision functions. Moreover, its computational complexity does not increase excessively, and makes it possible for implementation in practical CDMA communication systems.

关 键 词：码分多址 多用户检测 多址干扰 并行干扰抵消 

分 类 号：TN914.53[电子电信—通信与信息系统]