Pulse or digital communications – Repeaters – Testing
Patent
1993-08-30
1994-12-27
Cain, David C.
Pulse or digital communications
Repeaters
Testing
380 38, H04K 100
Patent
active
053772237
ABSTRACT:
A transmitter and receiver for spread spectrum communications using a Fourier series coefficients module, a notch gate, a fast Fourier transform module, and memory. The Fourier series coefficient module generates magnitude and phase values of a Fourier series. The notch gate notches the Fourier series coefficients at selected bands of frequencies. The selected band of frequencies are chosen so as not to provide interference with a preexisting user such as a cellular user, microwave user, or other radio communications. The fast Fourier transform generates from the notched Fourier series coefficients a spreading signal. The spreading signal has notches in its spectrum so as not to cause interference with the preexisting users. At the transmitter, the spreading signal is used to spread-spectrum process message data to generate a spread-spectrum signal for transmitting over a communications channel. At the receiver, the spreading signal is used to despread a receive spread-spectrum signal. At the receiver, the receive spread-spectrum signal has the advantage that the preexisting users are notched out and not part of the despread signal and therefore not part of the interference in the receiver detection circuits.
REFERENCES:
patent: 3571767 (1971-03-01), Bush
patent: 3794920 (1974-02-01), Darrow
patent: 4425642 (1984-01-01), Moses et al.
patent: 4425661 (1984-01-01), Moses et al.
patent: 4426630 (1984-01-01), Folkmann
patent: 4450417 (1984-05-01), Folkmann
patent: 4797923 (1989-01-01), Clarke
patent: 4914674 (1990-04-01), Kimber et al.
patent: 4965539 (1990-10-01), Korber, Jr.
patent: 5029184 (1991-07-01), Andren et al.
patent: 5161168 (1992-11-01), Schilling
patent: 5177768 (1993-01-01), Crespo et al.
patent: 5180999 (1993-01-01), Edwards
patent: 5185762 (1993-02-01), Schilling
patent: 5218618 (1993-06-01), Sagey
patent: 5228053 (1993-07-01), Miller et al.
patent: 5315583 (1994-05-01), Murhphy et al.
Cain David C.
InterDigital Technology Corporation
LandOfFree
Notch filtering a spread spectrum signal using fourier series co does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Notch filtering a spread spectrum signal using fourier series co, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Notch filtering a spread spectrum signal using fourier series co will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-924277