H - Electricity – 04 – K
Patent
H - Electricity
04
K
H04K 1/00 (2006.01) H04B 1/707 (2006.01)
Patent
CA 2131082
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.
Interdigital Technology Corporation
Sim & Mcburney
LandOfFree
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