Technique for acquiring timing and frequency synchronization for

Details Technique for acquiring timing and frequency synchronization for Technique for acquiring timing and frequency synchronization for

1984-04-17

1986-07-08

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375101, 375112, 375115, H04L 2508

Patent

active

045997322

ABSTRACT:
A signal processing scheme through which the receiver may, at any time, synchronize or resynchronize itself to the transmitted data signals that are received over a dynamic dispersive channel. At the transmitter, bursts or sequences of known symbols are interleaved with unknown data. At the receiver incoming frames of signals (containing interleaved bursts of known data and unknown data) are processed in a manner similar to the processing of spread spectrum encoded data. A replica (or respective replicas) of the known signal burst(s) is (complex) correlated with the incoming signal to locate and lock onto a known (PN) reference symbol burst. Once a known symbol block has been located, a symbol rate clock (bit sync) is adjusted to track out any offset in the timing used for sampling the received data. This is followed by coarse and fine frequency offset adjustments to enable the local oscillator to lock onto the transmitted frequency.

REFERENCES:
patent: 3935535 (1976-01-01), Motley et al.
patent: 4009356 (1977-02-01), Borysiewicz et al.
patent: 4112496 (1978-09-01), Stevens
patent: 4208650 (1980-06-01), Horn
patent: 4320517 (1982-03-01), Godard et al.
patent: 4398062 (1983-08-01), McRae et al.
patent: 4433425 (1984-02-01), Jaeger
patent: 4435826 (1984-03-01), Matsui
patent: 4514855 (1985-04-01), Lang et al.

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