Cooperative code-enhanced multi-user communications system

Details Cooperative code-enhanced multi-user communications system Cooperative code-enhanced multi-user communications system

2006-11-21

2006-11-21

Ghayour, Mohammed (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S323000, C375S341000

Reexamination Certificate

active

07139334

ABSTRACT:
A cooperative code-enhanced multiuser communications system having a receiver for resolving user ambiguity in a received composite signal by using convolutional encoder state machine properties to analyze strings of bit sums and separate out individual user data. The receiver comprises a signal sampler which converts a received composite signal to a digital data. A single point cluster mapper determines a closest pseudo-constellation point, and the pseudo-constellation point is formed with the aid of power and timing control in the transmitters. A bit sum look-up table maps symbol points to bit sums. A deterministic loop tests for bit sum cases where symbols can be determined immediately. A guess loop tests the bit sum after the deterministic loop test and performs guesses until all bits are decided. The bit sum is provided to a multiuser convolutional decoder to decide all user data streams.

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