한국정보통신학회:학술대회논문집 (Proceedings of the Korean Institute of Information and Commucation Sciences Conference)
- 한국해양정보통신학회 2008년도 추계종합학술대회 B
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- Pages.890-893
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- 2008
A Low Complexity Multi-level Sphere Decoder for MIMO Systems with QAM signals
- Pham, Van-Su (Information and Communications University (ICU)) ;
- Yoon, Gi-Wan (Information and Communications University (ICU))
- 발행 : 2008.10.31
초록
In this paper, we present a low complexity modified multi-level sphere decoder (SD) for multiple-input multiple-output (MIMO) systems employing quadrature amplitude modulation (QAM) signals. The proposed decoder, exploiting the multi-level structure of the QAM signal scheme, first decomposes the high-level constellation into low-level 4-QAM constellations, so-called sub-constellations. Then, it deploys SD in the sub-constellations in parallel. In addition, in the searching stage, it uses the optimal low-complexity sort method. Computer simulation results show that the proposed decoder can provide near optimal maximum-likelihood (ML) performance while it significantly reduces the computational load.