Some optimal and suboptimal receivers deriving information from nonsynchronized Poisson data Academic Article uri icon


  • The usual practice in the design of optimal decision receivers is to assume that, somehow, perfect symbol synchronization is present. Since perfect synchronization usually is not achievable, the resulting overall receiver that includes the synchronizer need not be jointly optimal, even if both the synchronization and the decision algorithms are individually optimal in some way. We derive receivers that make optimal sequence decisions from observations of modulated data in the absence of symbol synchronization for the direct-detection optical channel. We show that for soft-decision sequence estimation, the average number of likelihoods that must be evaluated need increase only linearly with the sequence length, with the average number of likelihood evaluations actually needed being smaller than the sequence length. Finally, we present computer simulations that compare the performance of two of our receivers to the performance of a receiver utilizing a separate synchronizer and to that of a receiver that is perfectly synchronized. 1989 IEEE

published proceedings

  • IEEE Transactions on Information Theory

author list (cited authors)

  • Georghiades, C. N.

citation count

  • 9

complete list of authors

  • Georghiades, CN

publication date

  • January 1989