摘要
在多目标同步DS-CDMA通信系统中,多址干扰带来的信噪比恶化已成为制约系统性能的重要因素。为了保证每个目标的解调性能,必须采用干扰消除算法。文中提出并实现了基于信号重构的并行干扰消除算法,信号相干解调后重构信号,之后各目标并行的消除其他干扰信号,然后再次相干解调,可以减小解调误码率。该算法已在TDRSS单址天线多目标测控系统的接收解调设备中应用,系统最大用户数量为12,各用户可以选用不同的PN码速率、信息速率、编码方式,在采用了文中提出的干扰消除算法后,能够有效降低多址干扰的影响。
In a multi-user synchronous DS-CDMA communication system,signal to noise ratio（ SNR）degradation brought by multiple access interference（ MAI） is one of the most important factors restricting system performance. To resist MAI and ensure demodulation capability,a parallel interference cancellation（ PIC） algorithm based on signal regeneration is proposed. A signal is regenerated after coherent demodulation to subtract other regenerated signals from total signals,the signal is demodulated again. The algorithm has been applied in receivers of TDRSS ground system. It can reduce the degrading effect of MAI on the desired user in a channel with 12 users on different PN chip rates,information rates and coder modes.
出处
《南京邮电大学学报（自然科学版）》
北大核心
2016年第1期64-70,共7页
Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition
关键词
多址干扰
信号重构
并行干扰消除
工程应用
multiple-access interference
signal regeneration
parallel interference cancellation（PIC）
application in engineering
