Interference detection and reduction

Details Interference detection and reduction Interference detection and reduction

1990-08-13

1993-06-22

Kuntz, Curtis

Pulse or digital communications

Spread spectrum

Direct sequence

375103, 328162, 328167, 455207, 455209, 455306, 455340, H04B 110

Patent

active

052221067

ABSTRACT:
Interference detection and reduction is disclosed in which an interference carrier is reduced by processing a signal of an input frequency to a demodulator such as a PSK signal appended with bit sequence for carrier recovery and bit timing recovery for use in the TDMA system, for example, a signal of the intermediate frequency (IF) band of a 140 MHz center frequency, so that the attenuation of a band-elimination filter is limited to a value smaller than a certain one, or for the frequency bands in which spectra are produced by the bit sequence, the IF signal is combined with the band-elimination filter output via a narrow band-pass filter to control the attenuation in each of these frequency bands to a value smaller than a certain one, thereby preventing the signal quality of the TDMA signal from being degraded by the insertion of the band-elimination filter. An interference detector of a multiplexer sweep system can be obtained by combining the functions of the phase-lock loop and the filter multiplexer so as to permit the estimation of the frequency of an interference carrier with a relatively simple structure.

REFERENCES:
patent: 2903693 (1959-09-01), Ley
patent: 3092776 (1963-06-01), Castellini
patent: 3783397 (1974-01-01), Dishal et al.
patent: 4475214 (1984-10-01), Gutleber
patent: 4646097 (1987-02-01), King

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