Patent ID: 6707788
Filing Date: 2004-03-16
Classification: H04B,H04J

Abstract:
A demodulation method in a mobile station having a plurality of channels, for receiving a signal from a base station having a plurality of channels, said base station further having a BPSK (Binary Phase Shift Keying) spreader for orthogonally spreading symbol data of each channel with an assigned orthogonal code, and a PN (Pseudorandom Noise) spreader for PN-spreading the orthogonally spread signal with a PN code, and transmitting a BPSK spread and PN spread signal to the mobile station, the demodulation method comprising the steps of:receiving the BPSK spread and PN-spread signal; PN-despreading the BPSK spread and PN-spread signal with the PN code by a PN despreader; and orthogonally despreading the BPSK spread and PN-despread signal with a complex orthogonal code having real and imaginary parts of the assigned orthogonal code by a QPSK despreader.