TDRSS接收机码分多址干扰抑制方案设计

为了在跟踪与数据中继卫星系统（TDRSS）中实现码分多址（CDMA）应用,需要完成多用户检测（MUD）及码分多址干扰（MAI）抑制。采用减性多级迭代对消算法,在数字信号处理芯片中完成信号再生、延时校正、时域相减对消,可以完成至少12通道的多用户检测,并能将多址干扰抑制至最小1 dB以内。该算法可作为通用MUD算法的有效补充,并能应用于各类非最优的CDMA系统中,具有迭代级数可选、通道扩展性强、工程实现性好的优点。

Scheme design of multiple access interference suppression in TDRSS receiver

For the purpose of using the Code Division Multiple Access(CDMA) in the Tracking and Data Relay Satellite System(TDRSS),the Multi-user Detection(MUD) and the suppression of Multiple Access Interference(MAI) need to be completed. This paper proposes multilevel subtract iterative cancellation method to realize at least 12-channel MUD through the signal regeneration,time delay correction,cancellation in time domain in digital signal processing(DSP) chip,and suppress the MAI within 1 dB. This algorithm can be used as an effective supplement of MUD algorithm,and can be applied to all non-optimal CDMA systems.It has the advantages of setting iteration level by resource capacity,expanding signal channel easily,and applying to engineering easily.