Reduced-Complexity Multiple-Symbol Detection for Free-Space Optical Communications

TitleReduced-Complexity Multiple-Symbol Detection for Free-Space Optical Communications
Publication TypeConference Paper
Year of Publication2007
AuthorsRiediger, M. L. B., R. Schober, and L. Lampe
Conference NameGlobal Telecommunications Conference, 2007. GLOBECOM '07. IEEE
Pagination4548 -4553
Date Publishednov.
Keywordsbit-error-rate, error statistics, free-space optical communication, MSD receiver, multiple-symbol detection, optical communication, optimal MSD, radio receivers, reduced-complexity decision metric, search algorithm, symbol-by-symbol noncoherent detection

In this paper, we investigate noncoherent detection, i.e. detection assuming the absence of channel state information at the receiver, of on-off keying in a free-space optical system. To partially recover the performance loss associated with symbol- by-symbol noncoherent detection, we consider the application of multiple-symbol detection (MSD), in which block-wise decisions are made using an observation window of N bit intervals. Specifically, we develop a fast search algorithm for optimal MSD and propose a reduced-complexity decision metric suitable for suboptimal MSD; performance results confirm that the optimal and suboptimal MSD metrics perform equally well. Significantly, the complexity of our MSD receiver, on a per bit-decision basis, is effectively independent of the length of the observation window. Furthermore, bit-error-rate results clearly indicate that the performance of the MSD receiver approaches the coherent detection lower bound with increasing N.


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