Parallel DSA for fast acquisition in M-ary DS/CDMA systems

In this paper, we introduce a parallel distributed sample acquisition (PDSA) scheme applicable to a DS/CDMA system employing the M-ary signaling for data transmission. The proposed PDSA scheme extends the applicability of the existing DSA scheme to the general signaling systems allowing multi-bit transmission per symbol. Since the PDSA contains the primitive DSA as a special case of M=2, it may be regarded as a generalized DSA system. For the construction of the PDSA system, pre resort to the igniter sequence concept of the primitive DSA and the parallel sampling and correction technique extended from the double sampling and correction proposed for the synchronization of the distributed sample scramblers (DSS). Through a design study we confirm that the PDSA scheme contributes to speeding up the acquisition time as well as to saving the hardware cost by enabling the reuse of the data transceiver circuitry for the synchronization process.