Layered space-time multiuser detection over wireless uplink systems
Layered space-time multiuser detection over wireless uplink systems
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DOI：
10.1109/twc.2003.814337
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发表时间：
2003-07
期刊：
影响因子：
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通讯作者：
S. Sfar;R. Murch;K. Letaief
中科院分区：
文献类型：
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作者：
S. Sfar;R. Murch;K. Letaief
在本文中，我们研究了分层空时(也称为垂直贝尔实验室分层空时(V-BLAST)方案)在衰落信道中用于多用户检测。V-BLAST中的多个发射天线被视为单个移动站发射机，而基站由多个接收天线组成。在所提出的系统中，用户被组织成组，并在同一组内分配唯一的扩频码。使用这些代码，我们能够分离不同的组，然后调用分层空时算法来进一步消除用户之间的剩余干扰。针对复星座和实星座，提出了一种基于解相关接收机的分层空时检测方法。对于后一种情况，我们在评估和比较了两种基于V-BLAST方案的解相关器的性能后，推导出了我们的接收器。结果表明，在很低的扩频因子的情况下，系统的性能得到了显著的改善，系统容量也得到了显著的提高。在考虑了基于串行分层空时分组多用户检测和并行分层空时分组多用户检测的低复杂度接收机的基础上，进一步介绍了结果。
In this paper, we investigate the use of layered space-time (also known as the vertical Bell Laboratories layered space-time (V-BLAST) scheme) for multiuser detection in fading channels. The multiple transmit antennas in V-BLAST are treated as individual mobile station transmitters, while the base station consists of multiple receive antennas. In the proposed system, users are organized in groups and allocated a unique spreading code within the same group. Using these codes, we are able to separate the different groups, and layered space-time algorithm is then invoked to further remove the remaining interference between users. A decorrelator-type receiver-based layered space-time detection is proposed for both complex and real constellations. For the latter case, we derive our receiver after evaluating and comparing the performance of two decorrelators based on the V-BLAST scheme. It is demonstrated that a significant performance improvement and increase in system capacity is obtained with very low spreading factors. Further results are also introduced by considering reduced complexity receivers based on serial layered space-time group multiuser detection, and parallel layered space-time group multiuser detection.