Adaptive soft demodulation for reception of distorted signals

Details Adaptive soft demodulation for reception of distorted signals Adaptive soft demodulation for reception of distorted signals

2004-04-24

2008-12-09

Lamarre, Guy J (Department: 2112)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S780000

Reexamination Certificate

active

07464318

ABSTRACT:
A satellite communications system comprises a transmitting ground station, including a transmitter and a receiver, a satellite transponder and a receiving ground station. The transmitter transmits an uplink signal to the satellite transponder, which broadcasts the received uplink signal as a downlink signal to the receiving ground station. The transmitting ground station monitors the downlink signal through the receiver and calculates log-likelihood ratios (LLRs) as a function of the monitored downlink signal. These LLRs are illustratively stored in a look-up table, which are then transmitted to the receiving ground station for use in recovering data from a received data signal.

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Search Report date Oct. 29, 2004.

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