| 摘要 |
<p>A code division multiplex communication method in which generated is an orthogonal code in chip synchronism established by the correlation peak from a surface acoustic wave matched filter by a synchronous code stream even if the communication channel is in a bad state, and hence all the packets are not lost and reproduction of the carrier from the received signal is not required, wherein synchronous bursts each comprising a synchronous packet part and a dummy part both constituted of 11-chip barker codes are provided in a preamble section of a spread spectrum signal, the time Tburst of one synchronous burst is equal to the symbol time Tsymbol of the data part modulated with 64-chip orthogonal m-series codes, an orthogonal code matched with the start timing of the first symbol of the data part is generated of the correlation peak of any one of the synchronous code streams is detected, and thus chip-synchronism is correctly established in a short time.</p> |
