CPFSK communication system employing nyquist-filtered modulator/

Details CPFSK communication system employing nyquist-filtered modulator/ CPFSK communication system employing nyquist-filtered modulator/

1987-05-08

1989-06-27

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 94, 375 99, 375 46, 375 79, H04L 2714, H03K 906

Patent

active

048436151

ABSTRACT:
An improved narrowband continuous phase modulation system incorporates a filtering mechanism in the transmitter and receiver sites that enables the radiated spectrum characteristic to have a substantially reduced response at frequencies other than the channel of interest and thereby achieve a significant reduction in unwanted adjacent channel interference. Each of the transmitter and receiver sites contains a square root Nyquist filter upstream and downstream of the modulator and demodulator, respectively. The output of the Nyquist filter in the receiver is coupled to an accumulator which sums successive samples of the demodulated data signals (including noise). The noise is reduced as a consequence of its inherent negative correlation properties (utilized in the accumulation of successive samples of the recovered signal).

REFERENCES:
patent: 3679983 (1972-07-01), Theriot
patent: 4003002 (1977-01-01), Snijders et al.
patent: 4229821 (1980-10-01), de Jager et al.
patent: 4388595 (1983-06-01), Brooks
patent: 4392231 (1983-07-01), Henry

Affiliated with

Also associated with

Rating

CPFSK communication system employing nyquist-filtered modulator/ does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with CPFSK communication system employing nyquist-filtered modulator/, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and CPFSK communication system employing nyquist-filtered modulator/ will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-819135