Receiver in a spread spectrum communication system

摘要

A spread spectrum cmmunication apparatus, comprises a reception antenna (102) for receiving a transmission signal; frequency converting means (104) for frequency converting the signal received at said reception antenna by a frequency in synchronization with transmission frequency to baseband I and Q signals; converting means (110) for converting the baseband I and Q signals frequency converted by said frequency converting means to digital signals; first correlating means (114) for correlating an output from said converting means with a predetermined code; first determining means (116) for determining an output from said first correlating means and outputting demodulated data; spread symbol estimating means (120) for estimating, using determination data of the output of said first determining means, preceding and succeeding spread symbols multiplexed on a multiplexed spread symbol to be cancelled; multiplexed signal removing means (124) for cancelling, by subtracting preceding and succeeding spread symbols to be cancelled multiplexed on the multiplexed spread symbol to be cancelled, by adjusting through successive delay timings of the spread symbol to be cancelled of the output from said spread symbol estimating means and timing of the multiplexed spread symbol to be cancelled of the output from said converting means; second correlating means (121) for correlating an output from said multiplexed signal removing means and a predetermined code; and second determining means (130) for determining an output from said second correlating means and providing demodulated data.