Patent ID: 6256339
Filing Date: 2001-07-03
Classification: H03M,H04B,H04L

Abstract:
A method for simultaneously receiving a plurality of channel signals in a shared spectrum of a wireless spread spectrum code division multiple access communication system, the system transmitting the channel signals using quadrature phase shift keying modulation, the channel signals having differing data rates and a same transmission data rate, the method comprising:receiving signals transmitted over the shared spectrum;demodulating the received signals to produce an in-phase intermediate frequency signal and a quadrature phase intermediate frequency signal;despreading with a code associated with each channel signal the in-phase and the quadrature phase intermediate frequency signals to produce a despread in-phase and a despread quadrature phase signal for each channel signal;for each channel signal having its data rate below the transmission data rate, combining received symbols of the despread in-phase and quadrature phase despread signals so that after the combining that channel's despread in-phase and quadrature phase signals have that channel's data rate; andsimultaneously processing each channel signal's despread in-phase and quadrature phase despread signals after the combining to recover data for each channel signal.