Receiver having an adjustable matched filter

Details Receiver having an adjustable matched filter Receiver having an adjustable matched filter

1992-03-30

1994-05-03

Chin, Stephen

Pulse or digital communications

Spread spectrum

Direct sequence

375 14, 375106, 375 96, 3647242, 333 18, H04B 110

Patent

active

053094824

ABSTRACT:
A radio receiver's digital matched filter (52') is intended to match a pulse-shaping filter (23) in the transmitter whose signals it receives. However, the clock signal on which the matched filter's timing is based is generated by a receiver clock (58') that is independent of the transmitter clock (56) and that is subjected to no timing adjustment to bring the two clock signals into synchronism. So as to ensure that the matched and pulse-shaping filters work together as a Nyquist filter, therefore, a timing-recovery circuit (60') senses the timing offset in the matched filter's output, and a coefficient generator (80) adjusts the matched filter's coefficients in such a manner that the filter itself imposes the delay needed for the required timing relationship between the filters.

REFERENCES:
patent: 4320517 (1982-03-01), Godard et al.
patent: 5018166 (1991-05-01), Tjahjadi et al.
patent: 5040192 (1991-08-01), Tjahjadi

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