| 摘要 |
PROBLEM TO BE SOLVED: To reduce deterioration in communication quality, and to improve transmission efficiency be encoding unnecessary transmission power generated when data to be transmitted are not present by using a second spread code orthogonally crossing a first spread code to be used at the time of spread encoding data to be transmitted. SOLUTION: A data buffer read control part 6 controls a multiplexer 5 so that encoded data from a data buffer 2 can be outputted from the multiplexer 5 synchronously with a time slot time corresponding to a first communication channel, and encoded data from a data buffer 4 can be outputted from the multiplexer 5 synchronously with a time slot time corresponding to a second communication channel. Thus, the time-division multiplex processing of the first and second communication channels can be realized. mixers 11 and 12 operate spread modulation to the encoded data outputted from the multiplexer 5 by using a division code column and a carrier wave frequency output. |
