Blind estimation of direct sequence spread spectrum signals in multipath

The interception/user acquisition problem involving the recovery of the transmitted information data stream is analyzed. Zero-forcing linear receivers/equalizers based on the estimated signal parameters are proposed to recover transmitted data. Their performance is compared with matched filter-based solutions. Among the assumptions made are that the bit period Tb, spreading factor P and code length KP are known and the sequence w(k) is a complex sequence deriving values from a finite QAM constellation.