小范围局域网络信号帧快速捕获方法研究（英文）

A method for fast acquisition of signal frames in small scale local area networks

针对小范围局域网络信号帧不确定性高,捕获速度慢的特点,提出一种新的小范围局域网络信号帧快速捕获方法。介绍了小范围局域网络信号帧生成及资源映射过程。采用FFT方法对经Q路处理后的数据进行计算,将得到的值和既定门限相比,判断是否转至跟踪状态。给出FFT伪码捕获方法流程图。通过并行局部相关以及FFT原理完成频域中的伪码检索,确定本地载波和接收信号载波间的频差,完成相应修正。把载波与伪码的二维检索转换成一维检测索,确定出两者间的频差。实验结果表明:所提方法复杂度低、捕获精度高、捕获速度快。

In view of the high uncertainty and slow acquisition speed of signal frames in small local area networks,a new method for fast acquisition of frame signals in small range local area networks is proposed in this paper.The frame generation and resource mapping process of small local area network are introduced.FFT method is used to calculate the data after Q processing,and compare the obtained value with the given threshold to judge whether to go to the tracking state.The flow chart of FFT PN code acquisition method is given.The pseudo code search in frequency domain is completed by the parallel local correlation and the FFT principle,and the frequency difference between the local carrier and the received signal carrier is determined,and the corresponding correction is completed.The two-dimensional search of carrier and pseudo code is converted into one dimensional detection cable,and the frequency difference between them is determined.Experimental results show that the proposed method has low complexity,high acquisition accuracy and fast acquisition speed.