Apparatus for transmitting and receiving data to provide high-speed data communication and method thereof

Abstract

A method for converting source data to a channel-modulated signal having a plurality of pairs of in-phase (I) and quadrature-phase (Q) data in a mobile station, wherein the mobile station uses at least one channel, includes the steps of: a) encoding the source data to generate at least one data part and a control part; b) generating at least one spreading code to be allocated to the channel, wherein each spreading code is selected on the basis of a data rate of the data part and the control part and spreading codes are selected so that two consecutive pairs of the I and Q data are correspondent to two points located on same point or symmetrical with respect to a zero point on a phase domain; and c) spreading the control part and the data part by using the spreading code, to thereby generate the channel-modulated signal.

1 . A mobile station capable of using a plurality of data channels and a control channel, comprising:
 an encoder that encodes 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 spreading 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;   a spreader that spreads the control channel and the data channels using the allocated spreading codes to thereby generate the channel-modulated signal; and   a scrambler that scrambles the generated 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 spreading 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.