New Adaptive Threshold Acquisition Scheme for PN Code

In view of the deficiency of the performance of fixed threshold acquisition for PN code in spread spectrum communication, a new adaptive threshold acquisition scheme is proposed by combining the median filtering with mathematical morphology in image processing. Based on the analysis of the statistical property of the decision variable, the estimator consisting of sequence conversion circuit and morphological filter is used to estimate the background noise real-timely to get adaptive threshold for acquisition decision. The Monte Carlo simulation result shows that the adaptive threshold acquisition scheme in the paper can adapt to the multi-path environment well. Its performance of anti-jamming is good and it has high practicability.