Method and arrangement for reducing frequency offset in a...

Details Method and arrangement for reducing frequency offset in a... Method and arrangement for reducing frequency offset in a...

2005-10-18

2005-10-18

Le, Amanda T. (Department: 2634)

Pulse or digital communications

Spread spectrum

Direct sequence

C455S313000

Reexamination Certificate

active

06956895

ABSTRACT:
The invention concerns generally the technology of reducing frequency offset in a radio receiver. Especially the invention concerns receivers where a channel estimator is used for correcting the base band signal. The objects of the invention are achieved by monitoring the phase of the channel estimation output and generating a complex phasor on the basis of successive phase values. The received baseband signal is then multiplied by the generated complex phasor for compensating the frequency offset. The frequency compensation can be made before or after said channel estimation thus producing a feedback compensation or feed forward compensation. The feedback compensation can be implemented by compensating the baseband signal either prior to the despreading or after the despreading.

REFERENCES:
patent: 5361276 (1994-11-01), Subramanian
patent: 5638362 (1997-06-01), Dohi et al.
patent: 5809084 (1998-09-01), Shida et al.
patent: 5909462 (1999-06-01), Kamerman et al.
patent: 6363102 (2002-03-01), Ling et al.
patent: 6373861 (2002-04-01), Lee
patent: 6466566 (2002-10-01), De Gaudenzi et al.
patent: 0 923 199 (1999-06-01), None
“A Novel Pilot Symbol Assisted Coherent Detection Scheme For Rician Fading Channels”, Asahara et al., WPMC'98.

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