| 摘要: |
| 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。 |
| 关键词: 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 |
| DOI： |
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| 基金项目: |
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| Scheme design of multiple access interference suppression in TDRSS receiver |
| BAO Jun,WANG Yuanling |
| () |
| Abstract: |
| 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. |
| Key words: tracking and data relay satellite system TT&C system code division multiple access multi-user detection multiple access interference iterative cancellation |
《电讯技术》编辑部 