...
首页> 外文期刊>Wireless Communications, IEEE Transactions on >Multiuser decorrelator detectors in MIMO CDMA systems over Nakagami fading channels
【24h】

Multiuser decorrelator detectors in MIMO CDMA systems over Nakagami fading channels

机译:Nakagami衰落信道上MIMO CDMA系统中的多用户去相关器检测器

获取原文
获取原文并翻译 | 示例
           

摘要

Space-time spreading has been employed to exploit the spatial diversity in multiple-input multiple-output (MIMO) code-division multiple-access (DS-CDMA) systems. In the presence of multiuser interference, resulting from the cross-correlation between users' code sequences, the full system diversity cannot be achieved when using the conventional matched receiver. In this paper we investigate the performance of space-time spreading (STS) and transmit diversity in the uplink of a MIMO DS-CDMA system over Nakagami-m fast-fading channels. The space-time system employs N = 2 transmit antennas and L receive antennas at the user side and base-station, respectively. We analyze the performance of the system when a linear decorrelator detector is employed to mitigate the effect of multiuser interference. In our analysis, we start by finding the probability density function (pdf) of the signal-to-interference ratio (SINR) at the output of the space-time combiner. Using this pdf, we derive a closed form expression for the bit-error rate (BER) for binary phase-shift keying (BPSK) transmission. The accuracy of the derived pdf and BER expression are verified using simulations, for different values of fading figure m and number of users.
机译:时空扩展已被用于在多输入多输出(MIMO)码分多址(DS-CDMA)系统中利用空间分集。由于用户代码序列之间的互相关,在存在多用户干扰的情况下,使用传统的匹配接收机无法实现完整的系统分集。在本文中,我们研究了Nakagami-m快速衰落信道上MIMO DS-CDMA系统上行链路中的空时扩展(STS)和传输分集的性能。时空系统在用户侧和基站分别使用N = 2个发射天线和L个接收天线。当使用线性去相关器检测器来减轻多用户干扰的影响时,我们分析了系统的性能。在我们的分析中,我们首先找到时空组合器输出处的信干比(SINR)的概率密度函数(pdf)。使用此pdf,我们导出了用于二进制相移键控(BPSK)传输的误码率(BER)的闭式表达式。对于不同的衰落图m值和用户数量,使用仿真验证了导出的pdf和BER表达式的准确性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号