| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a spread spectrum communication system excellent in transmission characteristics and multiplexing capacity. <P>SOLUTION: A spread code generating apparatus (10) carries out M-sequence multiplication and zero value addition of generated orthogonal codes to obtain channel identification codes, and then carries out inverse Fourier transform of the channel identification codes to generate spread codes (121) and inverse spread codes (131). A transmitting apparatus (20) and a receiving apparatus (30) store the spread codes (121) and the inverse spread codes (131) generated by the spread code generating apparatus (10), respectively, and use a signal code respectively selected from the stored codes to carry out spread spectrum communication. With the use of the spread codes for spreading, the input signal is spread over a wide frequency band with uniform power on the frequency axis. Thus, transmission characteristics are improved, and multiplexing capacity is increased. <P>COPYRIGHT: (C)2003,JPO |
