INPUT DATA SIGNAL COMMUNICATION METHOD, INPUT DATA SIGNAL ENCDDING METHOD, INPUT DATA SIGNAL CORRELATING METHOD, CODE SHARING MULTIPLEX SPREAD SPECTRUM COMMUNICATION SYSTEM DIFFERENTIAL SPREAD SPECTRUM DATA ENCODER AND DATA CORRELATOR

摘要

PURPOSE: To conduct an excellent code-division multiplex system communication by selecting and generating a spread spectrum expansion code sequence of specific length by a transmitter, sending it differentially according to an input data signal and receiving it on a receiver side, and reproducing the input data. CONSTITUTION: The input signal from a terminal 20 is applied to a spread spectrum encoder 22, and an output which is controlled with the length of a transmitter sequence selected by one of selection lines 36, 38, 40, and 42 is outputted through a PSK modulator and an RF transmitter 24 and sent from an antenna 26. This signal is received by the antenna 28 of the receiver, demodulated by an RF receiver and a PSK demodulator 30, and led to a spread spectrum correlator 32. Here, a receive sequence length selector 31 extracts a signal which is divided and selected to one of four lengths as a reception output. Consequently, the input signal is reproduced to make the code-division multiplex system communication excellently.