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。%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,cancella-tion in time domain in digital signal processing( DSP) chip,and suppress the MAI within 1 dB. This algo-rithm can be used as an effective supplement of MUD algorithm,and can be applied to all non-optimal CD-MA systems. It has the advantages of setting iteration level by resource capacity,expanding signal channel easily,and applying to engineering easily.
展开▼
