Patent ID: 6075810
Filing Date: 2000-06-13
Classification: G01S,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 a first data,first data NRZ formatting the first data,first providing a first 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 NRZ 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 NRZ formatted second code signal and the NRZ formatted second data,third code generating a third code signal,third code biphase-L formatting the third code signal,third data generating a third data,third data NRZ formatting the third data,third providing a third spread spectrum signal from the biphase-L formatted third code signal and the NRZ formatted third data,fourth providing a fourth spread spectrum signal from the second and third spread spectrum signals,providing first and fourth modulated spread spectrum signals from the first and fourth spread spectrum signals modulated in quadrature at the center carrier frequency within the bandwidth, andbroadcasting the modulated first and fourth spread spectrum signals over the bandwidth at the center carrier frequency, the second spectrum signal has a spectral null at a spectral maximum of the third spread at the center carrier frequency for separating the second and fourth modulated spread spectrum signals.