Carrier phase synchronization by reverse playback

Details Carrier phase synchronization by reverse playback Carrier phase synchronization by reverse playback

1996-11-29

1999-03-09

Ghebretinsae, Temesghen

Pulse or digital communications

Receivers

Angle modulation

375376, 329307, H04L 2714

Patent

active

058811109

ABSTRACT:
A digital demodulator (10) reads symbol samples into a memory buffer (38) that can be played forward and backward into a phase locked loop (48). During an initial non-data directed symbol timing estimating phase (56) the demodulator (10) achieves an approximate frequency synchronization and starts to achieve phase synchronization on an incoming stream of symbols. During a first forward readout pass (58) of stored samples, the phase locked loop (48) begins the frequency and phase convergence. During subsequent pass (60) using a reverse readout of stored samples, phase locked loop (48) continues to converge toward zero phase error. Then another forward pass (66), phase locked loop (48) achieves usable frequency and phase synchronization of carrier and begins valid data extraction.

REFERENCES:
patent: 4466108 (1984-08-01), Rhodes
patent: 4856027 (1989-08-01), Nakamura et al.
patent: 4968955 (1990-11-01), Yoshida et al.
patent: 5440265 (1995-08-01), Cochran et al.
patent: 5533059 (1996-07-01), Tsuda

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