Patent ID: 7443906
Filing Date: 2008-10-28
Classification: H04B,H04J

Abstract:
1. An apparatus 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 (N−1) data channels (N is an integer larger than two) and a control channel, the apparatus comprising: channel coding means for encoding the source data to generate (N−1) 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; code generating means for generating spreading codes to be allocated to the channels, wherein each of the spreading codes 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 the same point or symmetrical with respect to a zero point on a phase domain; and spreading means for spreading the control channel and the data channels by using the spreading codes to thereby generate the channel-modulated signal, wherein: the code generating means includes: the spreading code generation means includes: first spreading code generation means responsive to the count value and the spreading factor for generating the spreading codes to be allocated to the data channels; and second spreading code generation means responsive to the count value and the spreading factor for generating the spreading code to he allocated to the control channel, the spreading codes correspond to an orthogonal variable spreading factor (OVSF) code, the spreading code allocated to the control channel is represented by C the spreading codes allocated to first and second data channels are represented by C when there are more than two data channels, the spreading codes allocated to a third data channel and, when present, a fourth data channel are represented by C when there are more than four data channels, the spreading codes allocated to a fifth data channel and, when present, a sixth data channel are represented by C