Turbo decoding for high spectral efficiency satellite communications

The problem of efficient utilization of the frequency spectrum for coded satellite systems is investigated; one which results as a consequence of highly crowding adjacent channels. An analytical characterization of the resulting interference channel is introduced based on concepts in statistical dec...

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Bibliographische Detailangaben
Hauptverfasser: El Gamal, H., Beidas, B.F., Kay, S.
Format: Tagungsbericht
Sprache:eng
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Zusammenfassung:The problem of efficient utilization of the frequency spectrum for coded satellite systems is investigated; one which results as a consequence of highly crowding adjacent channels. An analytical characterization of the resulting interference channel is introduced based on concepts in statistical decision theory and is then exploited for interference cancellation. A joint implementation of MMSE interference cancellation and forward error control (FEC) decoding is considered where soft-input soft-output (SISO) modules are used along with the iterative structure. It is shown that, for example, one can operate a satellite system with convolutionally encoded QPSK modulation that uses practical pulse shaping at the channel spacing valve of 0.75 of the symbol rate, or bandwidth efficiency level of 2.67 bits-per-second/Hz, with minimum additional energy requirement. (This corresponds to a spectral efficiency improvement of 55% compared with a conservative baseline system.).
DOI:10.1109/ICC.2000.853357