A New Fast Acquisition Method of Parallel Search Pseudo-code and Frequency Offset Based on FFT
Luo Ju-feng Wang Xiang Fu Yao-xian Yuan Xiao-bing
Key Lab. of Wireless Sensor Network & Communication, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
Abstract：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.
罗炬锋, 王翔, 付耀先, 袁晓兵. 基于FFT并行搜索伪码和频偏的快速捕获新方法[J]. 电子与信息学报, 2011, 33(3): 563-568.
Luo Ju-Feng, Wang Xiang, Fu Yao-Xian, Yuan Xiao-Bing. A New Fast Acquisition Method of Parallel Search Pseudo-code and Frequency Offset Based on FFT. , 2011, 33(3): 563-568.
2011, Vol. 33 
