Decoding of the overhead channels of the geosynchronous...

Details Decoding of the overhead channels of the geosynchronous... Decoding of the overhead channels of the geosynchronous...

2011-07-19

2011-07-19

Torres, Juan A (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S325000, C375S343000

Reexamination Certificate

active

07983325

ABSTRACT:
A power efficient technique is used to demodulate the coded overhead channels of a geosynchronous (GEO) satellite uplink. A coherent receiver used in a wireless communication system is able to determine the information conveyed in the overhead channel, by effecting channel estimates from codewords extracted from a pilot signal. A valid set of codewords is established. Pilot symbols are extracted from a pilot signal and a channel estimate is made from the pilot signal. Codewords in the set of valid codewords are correlated and a channel phase ambiguity in the signals is removed and a codeword with the largest correlation is chosen. The chosen codeword is used to create a revised channel estimate.

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