Parallel acquisition scheme with reference filtering for a DS/SSMA packet radio system

This paper evaluated the performance of a non-coherent parallel matched-filter acquisition scheme with a reference filter for a direct-sequence/spread-spectrum multiple access (DS/SSMA) packet radio system. This acquisition scheme employs a reference filter to estimate the variance of the interference at the output of the detecting matched filter. Packet throughput for the parallel MF-RF scheme is derived for an AWGN and a nonselective fast Rayleigh fading channel. For multiuser environments, multiple access interference is considered in the performance analysis. From the numerical results, it is shown that the packet throughput decreases with the increasing number of users in the system, and increases with the increasing preamble length. The non-coherent parallel MF acquisition scheme with reference filtering is applicable to code division multiple access (CDMA) systems for packet-type services.