A new signal detection method for spatially multiplexed MIMO systems and its VLSI implementation

Authors:
Tae Ho Im;Insoo Park;Jinmin Kim;Joohyun Yi;Jaekwon Kim;Sungwook Yu;Yong Soo Cho
Affiliations:
Department of Electrical and Electronics Engineering, Chung-Ang University, Seoul, Korea;Department of Electrical and Electronics Engineering, Chung-Ang University, Seoul, Korea;Department of Electrical and Electronics Engineering, Chung-Ang University, Seoul, Korea;Samsung Electronics Company, Ltd., Suwon, Korea;Computers and Telecommunications Division, Yonsei University, Wonju, Korea;Department of Electrical and Electronics Engineering, Chung-Ang University, Seoul, Korea;Department of Electrical and Electronics Engineering, Chung-Ang University, Seoul, Korea
Venue:
IEEE Transactions on Circuits and Systems II: Express Briefs
Year:
2009

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Abstract

This brief proposes a new signal detection method called QR ordered successive interference cancellation (OSIC) with candidates (QOC) method for spatially multiplexed multiple-input-multiple-output (MIMO) systems. By using the OSIC algorithm and the maximum-likelihood (ML) metric, the proposed method achieves near-ML performance without requiring a large number of candidates. Although the proposed method can be used for both hard and soft decoding systems, it is particularly useful for soft decoding systems since the log-likelihood-ratio (LLR) value for all the bits can efficiently be computed without using LLR estimation. The proposed method is also suitable for very large scale integration (VLSI) implementation since it leads to a fixed throughput system. A QOC detector for a 4 × 4 16-quadratute-amplitude-modulation (16-QAM) MIMO system has been designed and synthesized with a 0.13-µm complimentary metal-oxide-semiconductor (CMOS) technology. The implementation results show that the proposed detector reduces the hardware complexity by 73% relative to a K-best detector.