Frequency offset estimation using the phase rotation of channel

Details Frequency offset estimation using the phase rotation of channel Frequency offset estimation using the phase rotation of channel

1993-01-04

1995-06-06

Chin, Stephen

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

375362, 327 3, 327 40, H04L 700, H04L 2536, H04L 2540

Patent

active

054229170

ABSTRACT:
A receiver (10) for extracting complex values by reference to a local frequency reference determines the frequency offset between a local oscillator (16) and the carrier by employing a circuit (40) for determining a "phase rotation." When a record of the input signal is determined to have resulted from a predetermined reference sequence of complex values, the phase-rotation circuit (40) compares the phases of complex values extracted from this record with corresponding symbols of the reference sequence. By comparing this difference for one part of the sequence with that for another, circuitry (38, 50, 52, 53, 54) in the receiver infers the frequency offset between the transmitter reference and the receiver reference, and a complex multiplier (34) compensates for this offset by multiplying the successive complex-valued samples by a complex exponential whose frequency is the negative of the frequency offset.

REFERENCES:
patent: 4674103 (1987-06-01), Chevillat et al.
patent: 4947409 (1990-08-01), Raith et al.
patent: 5049830 (1991-09-01), Yoshida
patent: 5093846 (1992-03-01), Walton, Jr. et al.
patent: 5121414 (1992-06-01), Levine
patent: 5128968 (1992-07-01), Yoshida
patent: 5150380 (1992-09-01), Okanoue
K. Anvari et al, "A Joint Algorithm for Receiver Timing Recovery and AFC, IEEE", pp. 26-30.

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