Noncoherent equalization algorithms based on sequence estimation

TitleNoncoherent equalization algorithms based on sequence estimation
Publication TypeConference Paper
Year of Publication1998
AuthorsGerstacker, W. H., R. Schober, and J. B. Huber
Conference NameGlobal Telecommunications Conference, 1998. GLOBECOM 98. The Bridge to Global Integration. IEEE
Pagination3485 -3490 vol.6
KeywordsAWGN channel, AWGN channels, complex-conjugated signal sample, data reconstruction, differential detection, differential detector, differential phase shift keying, equalisers, fading channels, flat fading channel, intersymbol interference, multiple-symbol differential detection, noncoherent equalization algorithms, noncoherent symbol-by-symbol equalizers, nonlinear intersymbol interference, optimum noncoherent sequence estimator, performance, received signal sample, sequence estimation, sequential estimation, signal reconstruction, Viterbi algorithm, Viterbi detection

Two noncoherent equalization algorithms are derived, which are based on sequence estimation. Better performance can be obtained than for noncoherent symbol-by-symbol equalizers known in literature. In the first scheme, the current received signal sample is multiplied by the previous complex-conjugated one like in a conventional differential detector prior to sequence estimation. Although this results in nonlinear intersymbol interference, the Viterbi algorithm (VA) can be employed for reconstruction of the data. The second algorithm is derived by modifying the optimum noncoherent sequence estimator, which is too complex for an implementation. The resulting scheme, which again applies the VA, can be interpreted as a generalization of multiple-symbol differential detection for the AWGN channel


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