A Novel Ds/ss Code Acquisition Technique Based on Seed Accumulation of Sequence Generator

The sequential estimation (SE) proposed by Ward for rapid acquisition of pseudo noise (PN) sequences works well only at moderate signal-to-noise ratios (SNR’s). In this paper, a seed accumulating sequential estimation (SASE) method based on accumulating seeds of the received PN sequence is proposed, which performs well at low SNR also. The mean acquisition time of the proposed SASE method is derived by the generating function flow graph technique, and correct chip, detection, and false alarm probabilities are obtained. Finally, numerical results show that the proposed SASE dramatically performs better than the conventional SE at low SNR and the improvement becomes larger as the period of PN sequence increases.