Patent ID: 8121173

Claim:
A mobile station, capable of using a plurality of data channels and a control channel, that converts source data to a channel-modulated signal, comprising: a channel coding unit that encodes the source data to generate a plurality of data parts and a control part, wherein the data parts are allocated to the data channels and the control part is allocated to the control channel; a code generator that generates spreading codes to be allocated to the channels, wherein each of the spreading codes is generated on the basis of a spreading factor related to a data rate for the respective channel and a code number for the respective channel; and a spreader that spreads the control channel and the data channels using the allocated spreading codes to thereby generate the channel-modulated signal, wherein: the spreading codes correspond to orthogonal variable spreading factor (OVSF) codes, the spreading code allocated to the control channel is represented by C 256, 0 , where 256 denotes the spreading factor and 0 the code number, the spreading codes allocated to first and second data channels are represented by C 4, 1 , and the code generator comprises: a counter that consecutively produces a count value in synchronization with a clock signal, a first spreading code generator responsive to the count value and the spreading factor for each data channel that generates the spreading code to be allocated to each data channel, and a second spreading code generator responsive to the count value and the spreading factor for the control channel that generates the spreading code to be allocated to the control channel.