Method and apparatus for carrier recovery and compensation in sp

Details Method and apparatus for carrier recovery and compensation in sp Method and apparatus for carrier recovery and compensation in sp

1997-01-23

1999-11-09

Bocure, Tesfaldet

Pulse or digital communications

Repeaters

Testing

375326, H04K 100

Patent

active

059828099

ABSTRACT:
An improved system and method for determining and tracking the carrier offset in a communications system. In an exemplary implementation, sampled spread spectrum digital signals are compensated with an expected carrier offset and stripped of pseudo-noise codes to produce demodulated signals. The demodulated signals are applied to a carrier offset estimator. The carrier offset estimator divides pairs of demodulated signals with a predetermined interval to produce results containing phase change information. The results are then averaged, and the average is normalized with respect to the predetermined interval to yield a new estimate of the carrier offset. The expected carrier frequency is adjusted based on the new offset estimate for frequency compensation in subsequent reception and transmission operations.

REFERENCES:
patent: 5787112 (1998-07-01), Murai
Proakis, J., Digital Communications, Third Edition, McGraw-Hill, Inc., pp. 337-342.

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