| 摘要 |
<p>The invention provides a variable rate CDMA spread circuit which can obtain a sufficient number of spread codes (i.e., channels) orthogonal to each other in a mobile communication system which employs the CDMA scheme and has a plurality of channels of different bit rates. The variable rate CDMA spread circuit includes channel transmission processing units. An adder adds transmission signals output from the plurality of channel transmission processing units. A spread code generator generates a spread code (long code) having a long period and assigned in units of base stations. A spreader spreads the synthesized transmission signal with the spread code (long code). A modulator modulates the transmission signal spread by the spread means to convert it into a radio signal and outputs the radio signal to an antenna.</p> |
