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2009
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EM-Based Maximum-Likelihood Sequence Detection for MIMO Optical Wireless Systems

9 years 5 months ago
EM-Based Maximum-Likelihood Sequence Detection for MIMO Optical Wireless Systems
—A major performance-limiting factor in terrestrial optical wireless (OW) systems is turbulence-induced fading. Exploiting the additional degrees of freedom in the spatial dimension, multiple laser transmitters combined with multiple receiver apertures provide an effective solution for fading mitigation. Although MIMO (Multiple-Input Multiple-Output) OW systems have been extensively studied in recent years, most of these works are mainly limited to symbol-by-symbol decoding. Maximum Likelihood Sequence Detection (MLSD) exploits the temporal correlation of turbulence-induced fading and promises further performance gains. In this paper, we investigate MLSD for IM/DD (intensity-modulation/direct-detection) MIMO OW systems over log-normal atmospheric turbulence channels. Even with a low-order modulation scheme such as On-Off keying which is typically used in OW systems, the complexity of MLSD might be prohibitive. We therefore present an iterative sequence detector based on the expectati...
Nestor D. Chatzidiamantis, Murat Uysal, Theodoros
Added 21 May 2010
Updated 21 May 2010
Type Conference
Year 2009
Where ICC
Authors Nestor D. Chatzidiamantis, Murat Uysal, Theodoros A. Tsiftsis, George K. Karagiannidis
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