| 摘要 |
Wireless base station apparatus and communication terminal apparatus that perform wireless transmission with high capacity, without losing the real time aspect where several users engage in communication simultaneously. User A's and user B's transmit data are respectively sent to dedicated CH spreading sections 201 and 202 for spreading-modulation processing using codes #0 and #1. The spread-modulated data are each orthogonal-modulated in orthogonal modulating sections 204 and 205 and output to multiplexing section 207. User A's and user B's transmit data buffered in retransmit buffer 215 are sent to shared CH spreading section 203 for spreading-modulation processing using code #2. The spread-modulated data are orthogonal-modulated in orthogonal modulating section 206 and output to multiplexing section 207. In multiplexing section 207, data respectively orthogonal-modulated are multiplexed, and, after predetermined wireless transmission processing is executed in radio frequency transmitting section 208, transmitted via antenna 209 to communication terminals as a downlink channel signal.
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