Performance evaluation of spread-spectrum code acquisition system using four-state Markov process

摘要: A direct sequence serial search acquisition scheme based on the assumption that there are two adjacent in-phase states (H/sub 1/ cell) in code position uncertainty region, which received pseudorandom noise (PN) and local despreading PN signal is coarsely aligned, presented. To utilize both cells, test statistic composed of observation couple cells by given type detector process modeled a four-state Markov chain. As an application this general approach, non-coherent matched filter BPSK spread-spectrum signals over additive white Gaussian (AWGN) channel analyzed. The mean time evaluated for various values system parameters. comparisons with conventional cell-by-cell show at almost same cost significant improvement can be achieved much more robust performance against change threshold or signal-to-noise ratio per chip (SNR/chip) reached.