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Trellis coded modulation for transmission over fading mobile satellite channel

  • US 4,945,549 A
  • Filed: 09/15/1988
  • Issued: 07/31/1990
  • Est. Priority Date: 11/13/1986
  • Status: Expired due to Term
First Claim
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1. A method of communication with a mobile receiver over a fading mobile-satellite channel for digital coded voice and data comprising the steps of trellis coding said data at a transmitter, block interleaving said trellis coded data, and multiple phase-shift-keyed signaling the trellis coded and block interleaved data with constant amplitude and distinct phase spacing in a signal set of phases greater than four, and thereafter quadrature modulating the result on an IF carrier and modulating the modulated IF carrier on an RF carrier for transmission through said mobile-satellite channel and including the step of inserting two pilot tones in the modulated IF carrier for use in synchronous demodulation of the IF carrier at said mobile receiver, and further including the steps at said mobile receiver of extracting said pilot tones, using said pilot tones for synchronous demodulation of said IF carrier to coherently detect received trellis coded data, block deinterleaving detected trellis coded data, and decoding the deinterleaved trellis coded data, said demodulating step including the steps of recovering information from extracted pilot tones for use as side information in said deinterleaved trellis decoding step.

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