Method and apparatus for improved zero intermediate frequency re

Details Method and apparatus for improved zero intermediate frequency re Method and apparatus for improved zero intermediate frequency re

1997-09-09

1999-05-04

Vo, Nguyen

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

455 84, 455324, H04B 140

Patent

active

059013443

ABSTRACT:
A transceiver (10) in a first embodiment includes a zero intermediate frequency (ZIF) receiver (11), which achieves high throughput operation by reducing receiver latency time due to receiver response within a receiver pass band to carrier spectral components of a modulated carrier frequency. During a receive mode, a receiver local oscillator (LO) frequency is offset from the carrier frequency within the receiver pass band, preferably as determined by worst case errors in the carrier frequency and the LO frequency. During a transmit mode, the receiver LO frequency is modulated in such a way as to suppress the LO center frequency component in the modulated spectrum.

REFERENCES:
patent: 4449250 (1984-05-01), Kurby
patent: 4520474 (1985-05-01), Vilmur
patent: 4523324 (1985-06-01), Marshall
patent: 4633511 (1986-12-01), Koga et al.
patent: 4653117 (1987-03-01), Heck
patent: 4944025 (1990-07-01), Gehring et al.
patent: 5003621 (1991-03-01), Gailus
patent: 5444865 (1995-08-01), Heck et al.
patent: 5493701 (1996-02-01), Makinen

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