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Very high-speed and high-quality packet transmissions in a limited bandwidth can be achieved by the joint use of Multi-Input Multi-Output (MIMO) multiplexing and Hybrid Automatic Repeat reQuest (HARQ). However, if Single-Carrier (SC) transmission is used, the transmission performance significantly degrades due not only to an Inter-Antenna Interference (IAI) but also to an Inter-Symbol Interference (ISI) resulting from a severe frequency-selective fading. Recently, the authors proposed a Training Sequence (TS) aided near Maximum Likelihood (ML) Block Detection using QR decomposition and M-algorithm (QRM-MLBD) to improve the transmission performance of SC-MIMO while significantly reducing computational complexity.
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