A rapid acquisition of PN sequences for DS/SS systems based on a truncated SPRT

The authors study a rapid coherent acquisition scheme, using a truncated sequential-probability-ratio test (TSPRT), for direct-sequence-spread spectrum (DS/SS) systems. Since the partial correlation of pseudonoise (PN) sequences is difficult to characterize, the worst-case partial correlation is considered. Linearized bounds of the partial correlation are used for designing the TSPRT so that the resulting test can achieve the prescribed acquisition condition. The design parameters of the TSPRT are chosen so that the average sample size (ASN) is minimized while keeping the maximum ASN smaller than that of the fixed dwell scheme with similar false alarm and miss probabilities. Some simulation results are obtained, and they agree well with analytic results.<
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