多用户CDMA系统下行链路空时分组编码研究

Proceedings of the Fifth IEEE International Symposium on Signal Processing and Information Technology, 2005. Pub Date : 2005-12-21 DOI:10.1109/ISSPIT.2005.1577079

S. Mohammad Razavizadeh, V. Tabataba Vakili, P. Azmi, M. Fardis

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引用次数: 3

摘要

本文介绍了一种用于多天线码分多址(CDMA)系统下行链路的新传输方案。该方案将Alamouti空时分组编码(STBC)方法扩展到多用户系统。此外，为了减轻传统接收机中的多址干扰，在发射机中采用了线性发射前置技术。研究表明，在CDMA系统中使用STBC码与传输前导相结合可以显著提高系统的容量。在这种方法中，移动终端操作简单，不需要其他用户的传播序列信息。计算机仿真结果表明，该方法与CDMA系统上行链路中基于接收分集和多用户检测相结合的方法具有相同的性能

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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On space-time block coding in downlink of multiuser CDMA systems

In this paper, we introduce a new transmission scheme for downlink of multiple antenna code division multiple access (CDMA) systems. In the proposed scheme, the Alamouti's space-time block coding (STBC) method is extended to multiuser systems. Moreover, to mitigate multiple access interference in the conventional receivers, the linear transmit preceding technique is used in the transmitter. We show that using STBC codes in conjunction with transmit preceding in CDMA systems can significantly increase the capacity of these systems. In this method, the mobile terminals are simple and they do not need any information about other users' spreading sequences. Our computer simulations show that the proposed method has the same performance as the methods based on the combination of receive diversity and multiuser detection in the uplink of CDMA systems

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来源期刊

Proceedings of the Fifth IEEE International Symposium on Signal Processing and Information Technology, 2005.

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