Apparatus and method for determining carrier frequency offset an

Details Apparatus and method for determining carrier frequency offset an Apparatus and method for determining carrier frequency offset an

1995-06-29

1997-08-05

Chin, Stephen

Pulse or digital communications

Transceivers

Modems

375364, H04B 138

Patent

active

056549822

ABSTRACT:
An apparatus and method for a data communications device such as a modem (100, 101) to determine carrier frequency offset and timing frequency offset, from a received probe signal. The various embodiments utilizing a processor (108) or digital signal processor (106) receive first and second sets of a transmitted probe signal having known characteristics, and determine a set of phase differences for the tones comprising the probe signal (702, 703, 704, 705). The various method and apparatus embodiments then form a linear approximation from the set of phase differences to determine the carrier frequency offset and the timing frequency offset (706). In the preferred embodiments, the linear approximation is formed from a minimization of a least square error estimate proportionally weighted by either signal to noise ratios or normalized, average amplitudes of the set of tones of the received probe signal.

REFERENCES:
patent: 4621366 (1986-11-01), Cain et al.
patent: 5048054 (1991-09-01), Eyuboglu et al.
patent: 5228062 (1993-07-01), Bingham

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