Patent ID: 7215656

Claim:
A transmitting method in CDMA (Code Division Multiple Access) systems with a transmitting apparatus and receiving apparatus, comprising the steps of: (a) generating a pilot signal and transmitting data signals for several channels with different information, said data signals including a pair of data signals and additional data signals; (b) supplying a pair of the data signals to a complex multiplier and spreading the pair of the data signals with complex orthogonal codes to obtain complex valued first spread signals, and spreading the additional data signals with complex orthogonal codes to obtain second spread signals; (c) adding the first complex valued spread and the second signals; (d) scrambling the added complex valued signals using complex valued PN (Pseudo-Noise) sequences; (e) modulating the scrambled signals with a carrier; and (f) transmitting a composite signal created by adding the modulated signals, wherein the complex spreading step and the complex scrambling step are arranged to improve the PAR (Peak-to-Average power Ratio) characteristic of the transmitter, and wherein the second complex-domain scrambling codes (C scramble,I [n]+jC scramble,Q [n]) in the scrambling step are given by the following equations in terms of the primary scrambling codes (C 1 [n], C 2 [n]: (a) when the spreading data vary, C scramble,I [n]+jC scramble,Q [n]=C 1 [n]+C 2 [n]; and (b) when the spreading data do not vary, C scramble,I [n]+jC scramble,Q [n]=−C 2 [n]C scramble,Q [n−1]H b [n−1]H b [n]+jC 2 [n] C scramble,I [n−1]H 1 [n−1]H a [n].