Fast multiple-symbol detection for free-space optical communications
IEEE Transactions on Communications
BER Performance of Free-Space Optical Transmission with Spatial Diversity
IEEE Transactions on Wireless Communications
Multiple-symbol detection for photon-counting MIMO free-space optical communications
IEEE Transactions on Wireless Communications - Part 2
Optical wireless: the story so far
IEEE Communications Magazine
Part 1: optical communication over the clear turbulent atmospheric channel using diversity
IEEE Journal on Selected Areas in Communications
Optical repetition MIMO transmission with multipulse PPM
IEEE Journal on Selected Areas in Communications
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We investigate detection methods for on-off keying (OOK) photon-counting Free Space Optical (FSO) systems in the presence of turbulence-induced fading, assuming no channel state information at the receiver. To recover the performance loss which is associated with symbol-by-symbol detection in such a scenario, we consider sequence detection techniques, exploiting the temporal correlation of the FSO channel. Due to its high complexity in the calculation of its metric, optimal maximum likelihood sequence detection (MLSD) is infeasible for most practical purposes. Hence, we propose a suboptimal low-complexity detection rule, which is based on the generalized maximum-likelihood sequence estimation. The proposed scheme allows the detection of sequence lengths that are prohibitive for conventional MLSD, without using any kind of channel knowledge. Monte Carlo simulation results show its performance to be very close to the optimum for large sequence lengths and various fading models.