Abstract
Atmospheric turbulence and pointing errors cause fluctuations in the signal intensity of the free-space optical intensity-modulation/direct-detection link. Additionally, background radiation brings a noisy photocurrent component into the received signal. Using the generalized likelihood ratio test principle, a Viterbi-type trellis-search sequence receiver is proposed, which estimates both the channel gain and the background component and detects the data sequence simultaneously. It has the advantage of a low search complexity that does not depend on the observation window length $L$ , and its error performance approaches that of detection with perfect channel state information and no background radiation, as $L$ becomes large.
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