Carrier synchronization and symbol synchronization for offset-QP

Details Carrier synchronization and symbol synchronization for offset-QP Carrier synchronization and symbol synchronization for offset-QP

1980-07-07

1982-01-26

Britton, Howard

Pulse or digital communications

Repeaters

Testing

375 85, H04L 2722, H03D 302

Patent

active

043132057

ABSTRACT:
In a TDMA burst preamble, the phase is varied between .+-..pi./4 radians, and carrier synchronization is achieved by averaging the phase over a given interval. Symbol timing synchronization is achieved by filtering the upper sideband of a conventional delay-and-multiply circuit and demodulating the filtered upper sideband with a coherent carrier available by the end of the preamble. After the preamble, modulation removal is used to obtain the unmodulated carrier.

REFERENCES:
patent: 4057759 (1977-11-01), Genova
patent: 4083009 (1978-04-01), Bickford
patent: 4085378 (1978-04-01), Ryan
patent: 4092606 (1978-05-01), Ryan
patent: 4180779 (1979-12-01), Hook

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