| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a system for spread spectrum communication, excellent in transmission characteristics and multiplexing capacity. <P>SOLUTION: A spreading 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 spreading codes 121 and inverse spreading codes 131. A transmitting apparatus 20 and a receiving apparatus 30 store the spreading codes 121 and the inverse spreading code 131 generated by the spreading code generating apparatus 10, respectively, and use a single code respectively selected from the stored codes to carry out spread spectrum communication. With the use of the spreading 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)2011,JPO&INPIT |
