Rapid acquisition techniques in CDMA spread-spectrum systems

A rapid acquisition scheme for code division multiple access (CDMA) spread-spectrum systems which utilises partial correlation of maximum length sequences is investigated. The method involves subsequence matched filtering (SMF) to acquire sync. and feedback control to verify sync. acquisition. Expressions of probabilities of sync. acquisition, false alarm, false dismissal and mean acquisition time are derived. Numerical results for a multiuser environment are presented. Acquisition performance for a single-user case is compared with those of the RASE and RARASE methods. The SMF method offers rapid sync. acquisition over a wide range of signal/noise ratios.