| 摘要 |
PURPOSE:To make it possible to set up a completely-random communication circuit in a short time by increasing number assignment and by realizing the shortening of an initial connection by the frequency of a multi-frequency signal and phase information, by obtaining the logical product of a PN (false) code and the multi-frequency signal. CONSTITUTION:A transmission side consists of SSRA transmission part 1 which generates a SSRA (spread spectrum random access) signal, synthesizer 2 which generates frequencies (f1) and (f2), switch 5 alternates between the both, adder 7 which mixes the SSRA signal with a signal of frequency (f1) or (f2), and antenna 8. Here, a PN code is taken as a number, and the combination between (f1) and (f2) as an office number; and the phase of a two-frequency signal or a frequency change point is superposed upon the SSRA signal synchronizing with frames of the PN code, thereby sending them out. A reception side, on the other hand, receives the multi-frequency signal to detect its own office number and then attain frequency synchronization to detect a PN frame position from the frequency or phase change point, so that the synchronization of a SSRA circuit can be established in a short time the information. |
