Patent ID: 7292624

Claim:
A spread spectrum receiver, comprising: a correlator to cross correlate in-phase and quadrature direct sequence spread spectrum (DSSS) signals (a) for a current symbol, by: correlating the in-phase DSSS signal for the current symbol relative to a stored replica of the in-phase DSSS signal; correlating the quadrature DSSS signal for the current symbol relative to a stored replica of the quadrature DSSS signal; correlating the in-phase DSSS signal for the current symbol relative to a stored replica of the quadrature DSSS signal; correlating the quadrature DSSS signal for the current symbol relative to a stored replica of the in-phase DSSS signal; and (b) for a previous symbol, by: correlating the in-phase DSSS signal for the previous symbol relative to a stored replica of the in-phase DSSS signal; correlating the quadrature DSSS signal for the previous symbol relative to a stored replica of the quadrature DSSS signal; correlating the in-phase DSSS signal for the previous symbol relative to a stored replica of the quadrature DSSS signal; and correlating the quadrature DSSS signal for the previous symbol relative to a stored replica of the in-phase DSSS signal; and a mixer to mix each of the four cross correlations for the current symbol with corresponding ones of the four cross correlations for the previous symbol; and an adder to combine the associated current and previous symbol cross correlations into a detection statistic.