Patent ID: 6148022
Filing Date: 2000-11-14
Classification: H04B,H04L

Abstract:
A transmission method for spectral separation of a first and a second modulated spread spectrum signals transmitted over a bandwidth having center carrier frequency, the method comprising the steps of,first code generating a first code signal,first code NRZ formatting the first code signal,first data generating the first data,first data NRZ formatting the first data,first providing a spread spectrum signal from the NRZ formatted first code signal and the NRZ formatted first data,second code generating a second code signal,second code biphase-L formatting the second code signal,second data generating a second data,second data NRZ formatting the second data,second providing a second spread spectrum signal from the biphase-L formatted second signal and the NRZ formatted second data,providing first and second modulated spread spectrum signals from the first and second spread spectrum signals in quadrature at the center carrier frequency within the bandwidth, andbroadcasting the first and second modulated spread spectrum signals within the bandwidth at the center carrier frequency, the second modulated spread spectrum signal has a spectral null at a spectral maximum of the first modulated spread spectrum signal at the center carrier frequency providing spectral separation of the first and second modulated spread spectrum signals.