Trellis coded modulation for transmission over fading mobile satellite channel
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United States of America Patent
Stats
-
Jul 31, 1990
Issued Date -
N/A
app pub date -
Sep 15, 1988
filing date -
Nov 13, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The combination of trellis coding and MPSK signaling with asymmetry (nonuniform spacing) to the signal set is disclosed with regard to its suitability for a fading mobile satellite communication channel. For MPSK signaling, introducing nonuniformity in the phase spacing between signal points provides an improvement in performance over that achievable with trellis codes symmetric MPSK signaling, all this without increasing the average or peak power, or changing the bandwidth constraints imposed on the system. Block interleaving may be used to reduce error and pilot tone(s) may be used for improving the error correction performance of the trellis decoder in the presence of channel fading.
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