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
复制标题
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:
文献类型:
--
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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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