Frequency offset estimation using the phase rotation of...

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

H - Electricity

04

B

H04B 7/01 (2006.01) H03J 7/02 (2006.01) H04L 7/02 (2006.01) H04L 7/04 (2006.01) H04L 27/00 (2006.01)

Patent

CA 2103299

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.

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