北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2006, Vol. 29 ›› Issue (3): 99-102.doi: 10.13190/jbupt.200603.99.014

• 研究报告 • 上一篇    下一篇

多径衰落下基于多码检测的多天线CDMA信道容量

王军选1 , 尧文元2 , 廖汉程2   

  1. 1. 西安邮电学院 通信工程系,西安 710061; 2. 江西财经大学 电子学院, 南昌 330013
  • 收稿日期:2005-07-01 修回日期:1900-01-01 出版日期:2006-06-30 发布日期:2006-06-30
  • 通讯作者: 王军选

Capacity of MIMO CDMA with Multi-code Detection under Multi-path Fading Channel

WANG Jun-xuan1 , RAO Wen-yuan2 , LIAO Han-cheng2   

  1. 1. Xi’an Institute of Post and Telecommunication Department of Communications Engineering, Xi’an 710061,China;2. School of Electronics, Jiangxi University of Finance and Economics,Nanchang 330013,China
  • Received:2005-07-01 Revised:1900-01-01 Online:2006-06-30 Published:2006-06-30
  • Contact: Wang Jun-xuan

摘要:

研究了基于LS码和Walsh码多天线CDMA系统在干扰方差已知和干扰方差未知两种情况下的容量,给出了理论分析。理论和仿真结果符合表明:使用LS码的系统容量远远大于基于使用Walsh码的CDMA系统;干扰方差对LS码系统没有任何影响,容量与信噪比呈线性关系;而对于传统CDMA系统,干扰方差未知要损失一定的容量,并且在信噪比大于18dB的时候有平台效应。

关键词: 信道容量, 扩频地址码, 多码检测

Abstract:

The capacity of multi-antennas CDMA systems with LS codes and Walsh codes under interference covariance known and interference covariance unknown were studied in the paper. Theory analyses were also given. Both of theory and numeral results show that: capacity of CDMA systems based on LS codes is far greater than that of CDMA systems based on Walsh codes; for LS CDMA systems, interference covariance is no influence on capacity, and capacity is linear with SNR when using multi-code detection; but for conventional CDMA systems, it will loss any capacity as interference covariance unknown, and also have a floor when SNR great than 18dB.

Key words: channel capacity, spread spectrum access codes, multi-code detection

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