电讯技术
電訊技術
전신기술
TELECOMMUNICATIONS ENGINEERING
2015年
5期
533-538
,共6页
跟踪数据中继卫星系统%测控通信系统%码分多址%多用户检测%码分多址干扰%迭代对消
跟蹤數據中繼衛星繫統%測控通信繫統%碼分多阯%多用戶檢測%碼分多阯榦擾%迭代對消
근종수거중계위성계통%측공통신계통%마분다지%다용호검측%마분다지간우%질대대소
tracking and data relay satellite system%TT&C system%code division multiple access%multi-us-er detection%multiple access interference%iterative cancellation
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。
為瞭在跟蹤與數據中繼衛星繫統( TDRSS)中實現碼分多阯( CDMA)應用,需要完成多用戶檢測( MUD)及碼分多阯榦擾( MAI)抑製。採用減性多級迭代對消算法,在數字信號處理芯片中完成信號再生、延時校正、時域相減對消,可以完成至少12通道的多用戶檢測,併能將多阯榦擾抑製至最小1 dB以內。該算法可作為通用MUD算法的有效補充,併能應用于各類非最優的CDMA繫統中,具有迭代級數可選、通道擴展性彊、工程實現性好的優點。
위료재근종여수거중계위성계통( TDRSS)중실현마분다지( CDMA)응용,수요완성다용호검측( MUD)급마분다지간우( MAI)억제。채용감성다급질대대소산법,재수자신호처리심편중완성신호재생、연시교정、시역상감대소,가이완성지소12통도적다용호검측,병능장다지간우억제지최소1 dB이내。해산법가작위통용MUD산법적유효보충,병능응용우각류비최우적CDMA계통중,구유질대급수가선、통도확전성강、공정실현성호적우점。
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.