DIGITAL CORRELATOR FOR SPREAD SPECTRUM RECEIVER

摘要

PURPOSE:To reduce the number of bits and circuit scale by obtaining synchronization based upon a correlation value outputted from a correlation value output means and executing spread decoding. CONSTITUTION:A received signal received by an antenna is inputted to a spread demodulating circuit and a synchronizing circuit and synchronization with a PN code in the received signal is obtained. The spread demodulating circuit is provided with a coincidence number ing circuit 26 for detecting coincidence number between the PN code in the input data and a set PN code and a ROM 27 to be a correlation value output means for outputting a correlation value Rs' obtained by degenerating a logical correlation value only by one bit based upon the coincidence number data outputted from the circuit 26 and constituted so as to specify an address in the ROM 27 based upon the coincidence number data obtained from the circuit 26 and extract the corresponding one-bit degenerated correlation value Rs' from the specified address of the ROM 27. The circuit 26 executes multiplication by means of an exclusive OR circuit.