Correlation circuit for spread spectrum communication, demodulation circuit and reception apparatus

A reception apparatus comprising a correlation circuit for spread spectrum communication comprising:

• a plurality of RF units for receiving spread spectrum analog high-frequency signals with a plurality of antennas covering sectors, performing wave detection of the received signals, and performing a demodulation processing for conversion to base band signals;
• a plurality of A/D converters for converting I, Q base band analog signals outputted from said RF units to digital signals having I signal components and Q signal components;
• a plurality of memory units for storing the digital signals from said A/D converters by a data unit of at least one symbol;
• a high-rate MF for receiving alternately I signal components stored in any memory units or Q signal components stored in other memory units except memory units that stored the I signal components at a rate which is higher than a rate of the input digital signal to said memory units;
• a code generator for generating a spread code;
• and
• a controller for controlling an operation timing in each component,
• said high-rate MF being a high-rate MF for performing a product sum operation four times alternately with the I signal components or the Q signal components and a spread code taken in at the high rate from the code generator, calculating further sum and difference and outputting a correlation output.