Performance Analysis of a Modified V-BLAST System With Delay Offsets Using Zero-Forcing Detection

Performance Analysis of a Modified V-BLAST System With Delay Offsets Using Zero-Forcing Detection
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使用迫零检测对具有延迟偏移的改进型 V-BLAST 系统进行性能分析

DOI:
10.1109/tvt.2007.901935
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发表时间:
2007-11
影响因子:
6.8
通讯作者:
--
中科院分区:
计算机科学2区
文献类型:
--
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本文研究了一种改进的垂直贝尔实验室分层空时(V-BLAST)系统,在该系统中,不同的延迟偏移量被有意地应用于空间复用的数据流。该系统通过迫零(ZF)检测只需一根接收天线即可恢复发送信息,而传统的同步V-BLAST系统需要mT(其中mT和mR分别为发射天线和接收天线的数目)。对于采用ZF策略的mT次MR修正系统,推导了其误码率的精确闭合表达式。与传统的同步V-BLAST系统相比,改进的V-BLAST系统可以使用ZF检测实现MR阶分集,但分集阶数的增加是以牺牲复用增益为代价的。虽然系统中的时延偏差引入了一个衰减因子,降低了瞬时信噪比,但在适当的系统参数下,改进的系统的误码率性能比传统的同步V-BLAST系统有了很大的提高。
This paper focuses on a modified Vertical-Bell Labs layered space-time (V-BLAST) system, where different delay offsets are intentionally applied to the spatially multiplexed data streams. The proposed system can use only one receive antenna to recover the transmitted information by zero forcing (ZF) detection, whereas the conventional synchronous V-BLAST system requires that Mr ges Mt (where Mt and Mr are the number of transmit and receive antennas, respectively). The exact closed-form expression of bit error rates (BERs) is derived for an Mt times Mr modified system with ZF strategy. Compared with the conventional synchronous V-BLAST system, the modified system can achieve Mr-th-order diversity using ZF detection; however, the increase in the diversity order comes at the cost of the multiplexing gain. Although delay offsets in the system introduce an attenuation factor that decreases the instantaneous signal-to-noise ratio, the BER performance of the modified system with proper system parameters demonstrates a performance improvement over the conventional synchronous V-BLAST system.
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