Doppler compensated receiver

Details Doppler compensated receiver Doppler compensated receiver

2007-04-24

2007-04-24

Ha, Dac (Department: 2611)

Pulse or digital communications

Receivers

Interference or noise reduction

C375S285000, C367S904000, C367S094000, C367S090000

Reexamination Certificate

active

10617188

ABSTRACT:
A receiver includes a controller which receives A/D sampled input signals and shifts the sampled digital signal to compensate for Doppler effect in the input signal prior to demodulation. The controller compensates for a Doppler increased frequency by shifting the sampled digital signal so as to skip a sample period every n samples. This may be achieved by decreasing a cycle of m samples by one sample period every n samples. The controller compensates for a Doppler decreased frequency by shifting the sampled digital signal so as to add a sample period every n samples. This may be achieved by repeating a sample every n samples to shift the sampled digital signal. The compensation is performed in software on a multi-threaded processor.

REFERENCES:
patent: 5130952 (1992-07-01), Feintuch et al.
patent: 5719944 (1998-02-01), Banerjea
patent: 5732044 (1998-03-01), Jarvis
patent: 5901171 (1999-05-01), Kohli et al.
patent: 6044105 (2000-03-01), Gronemeyer
patent: 6633617 (2003-10-01), Cooklev
patent: 2003/0016168 (2003-01-01), Jandrell

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