Method and apparatus for obtaining initial carrier and symbol ph

Details Method and apparatus for obtaining initial carrier and symbol ph Method and apparatus for obtaining initial carrier and symbol ph

1998-05-13

2000-06-13

Vo, Don N.

Pulse or digital communications

Receivers

Angle modulation

375332, 329304, H04L 2714, H04L 2716

Patent

active

060758260

ABSTRACT:
A method and apparatus for determining initial carrier and symbol phase estimates in a burst mode digital communication system are described. In-phase and quadrature sample of a BPSK preamble are sampled to obtain correlation values. Next, sum and differences of the correlation values are obtained. Then the initial carrier phase estimate (THETAHAT) and the initial symbol phase estimate (TAUHAT) are obtained through application of an algorithm. The apparatus that implements the method consists of adders, inverters, arc tangent look-up tables and divide by 2 logic units.

REFERENCES:
patent: 4313205 (1982-01-01), Rhodes
patent: 4847869 (1989-07-01), Labedz et al.
patent: 4856027 (1989-08-01), Nakamura et al.
patent: 4885756 (1989-12-01), Fontanes et al.
patent: 5001727 (1991-03-01), McDavid
patent: 5131008 (1992-07-01), Kazecki et al.
patent: 5170415 (1992-12-01), Yoshida et al.
patent: 5272446 (1993-12-01), Chalmers et al.
S.A. Rhodes et al.; "Digital On-Board Demodulator for Reception of an Up-Link Group of TDMA/QPSK Channels"; Apr. 1989; pp. 1-8.

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