| 摘要 |
PROBLEM TO BE SOLVED: To reduce the interference by another channel being one of the large deteriorating factors of communication quality in the communication system of a mobile object using a CDMA(code division multiple access) system as radio access. SOLUTION: A signal is modulated by a modulator 16, and a beam in which a receiving power is maximum at the time of reception is selected by a beam selecting circuit 10, spread modulated by spread modulators 15, converted into analog signals by D/A converters 14, and frequency-converted by up-converters 13. Afterwards, a multi-beam is formed by a multi-beam forming part 4, amplified by large power amplifiers 12, and only a transmission wave is separated by antenna sharers 2, and radiated by each beam from element antennas 1. |
