| 摘要 |
<p>PROBLEM TO BE SOLVED: To realize a transmitter or the like for code division multiplex communication which has a high transmission capacity, which is hardly affected by a delay wave and has less number of parallel transmission. SOLUTION: A data divider 301 of a transmitter 221 divides transmission information into 12-bits and 8-bits, an M sequence code generator 302 generates a basic code, a cyclic shift code generator 303 generates 31 sets of cyclic codes, and a cyclic extended code generator 304 generates 31-sets of cyclic extended codes, a code combination selector 305 selects a combination of the cyclic extended codes (5 codes) corresponding one to one to the 12-bit information, a scramble circuit 306 applies QPSK modulation to the 8-bit information, a serial parallel converter 307 applies parallel conversion to the modulated 8-bit information into 4 channels, each of code spread devices 308 applies spread spectrum processing to each of the 4-channel information by using the selected cyclic extended code, and a code division multiplexer circuit 309 multiplexes the outputs of the devices 308 and an antenna 310 transmits the multiplexed signal.</p> |
