A New Fast Acquisition Method of Parallel Search Pseudo-code and Frequency Offset Based on FFT

The communication between nodes is designed to meet the low consumption of resources, large carrier frequency offset, low-cost physical layer requirements because nodes are generally subject to resource, cost and power consumption constraints in wireless sensor networks. This paper presents a new fast acquisition method which uses Parallel Search Pseudo-code phase and Frequency offset based on FFT (PSPF-FFT). It firstly searches the pseudo-code phase after differential processing of the signal, then it searches frequency offset after pseudo-code phase is synchronized. The reduction of resource and average acquisition time can be achieved by sacrificing a slight performance of signal-to-noise ratio (SNR). The theoretical analysis and simulation prove the practicability of the new acquisition method. The proposed method in this paper has obvious performance advantages compared to the traditional method with the same resource and average acquisition time consumption.