关键词: Tanner图, 和积算法, 伪随机码, 迭代捕获

Abstract:

To solve the problem of long acquisition time of routine PN code acquisition algorithm, a PN code iterative acquisition algorithm based on Tanner graph is proposed. The Tanner graph show of PN code and the sum-product algorithm process on the graph are presented. The performance of iterative acquisition algorithm is analyzed by simulation and the sum-product algorithm is modified. The simulation results show that when the signal-noise ratio is not very low, the bit-error rate of the APP estimation will convergence to zero.

Key words: Tanner graph, sum-product algorithm, PN code, iterative acquisition