New acquisition decision algorithm for multiple access interference suppression in DSSS system

For decreasing the multiple access interference of weaker signal acquisition in direct sequence spread spectrum (DSSS) systems, a new single decision algorithm is presented. The maximum value of correlation results is conventionally detected. However, there may be not only one strong peak among correlation results when the cross-correlation noise is strong enough to affect the correlation results. The proposed algorithm decreases the false alarm probability through the decision of the ratio of the maximum value and the second maximum value of the correlation results. Theoretical analysis and simulation results indicate that the proposed algorithm effectively suppresses the acquisition problem of multiple access interference in DSSS system.