| 摘要 |
<p>A digital base band section (101) includes spread units (103 - 105) for directly spreading input transmission data every channel by different spread codes to output spread signals, a summer (106) for summing up the spread signals to output a multiplexed spread signal, a limiter (107) for limiting an amplitude of the multiplexed spread signal not to exceed a predetermined value, and a roll-off filter (108) limits a transmission spectrum by shaping a waveform of the transmission signal to output a digital base band signal (s3) to an analog base band/RF section (102), where it is converted into an analog base band signal by a digital-to-analog converter (109) and a carrier is modulated to convert the analog base band signal into an RF signal in a modulator (110), which RF signal is amplified in a transmission power amplifier (111) to transmit the amplified RF signal through a transmission antenna (112). <IMAGE></p> |
