Correlation circuit for spread spectrum communication

Abstract

There is disclosed a correlation circuit for spread spectrum communication which reduces the number of constituting elements to attain low power consumption and which can obtain correlation in a short time, to solve a problem that a conventional sliding correlator requires much time to obtain the correlation and that a matched filter increases the power consumption. In the spread spectrum communication correlation circuit, an A/D converter converts a received spread spectrum signal to a digital signal. Under control of a controller, one symbol of signals are written to an S/H circuit with a 16 MHz. clock, shifted for each sample and read to a high-speed correlator from the S/H circuit with a high-speed clock of 1.6 GHz a plurality of times, and the high-speed correlator performs a product sum operation with a spread code with the 1.6 GHz clock. At the same time the reading is performed, the next symbol of signals are written to the S/H circuit.