检测前导的方法及其装置

Method and device for detecting precursor

Abstract

The invention discloses a method and a device for detecting a precursor. The method comprises the following steps: multiplying data received by each antenna by the result of a discrete Fourier transform (DFT) of a root ZC frequency in the way of frequency domain; carrying out an inverse fast Fourier transform (IFFT) of the multiplied data, wherein the IFFT data number is smaller than a data numbercorresponding to minimum resolution satisfying a round-trip delay of a network; merging peak values of IFFT data received by multi-channel antennae; carrying out the time domain interpolation of merging results; and detecting the peak values of the data after the time domain interpolation. The invention embodiment lowers the IFFT complexity by reducing the IFFT data number so as to reduce time consumed in a random access precursor detection process.
本发明实施例公开了一种检测前导的方法及其装置,该方法为:将每一路天线接收的数据与根ZC序列的离散傅里叶变换变换结果进行频域相乘;将相乘得到的数据进行逆快速傅立叶变换,逆快速傅立叶变换的数据个数小于满足网络往返延时的最小分辨率对应的数据个数;将多路天线接收的经过逆快速傅立叶变换的数据峰值合并;对合并结果进行时域插值,再对时域插值后的数据进行峰值检测。本发明实施例通过减少逆快速傅立叶变换的数据个数,降低逆快速傅立叶变换复杂度,从而降低逆快速傅立叶变换在随机接入前导检测过程中的耗时。

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Cited By (3)

    Publication numberPublication dateAssigneeTitle
    CN-101860395-AOctober 13, 2010合肥东芯通信股份有限公司一种前导preamble序列的生成方法和设备
    CN-103108337-AMay 15, 2013京信通信系统(中国)有限公司Detection method, device and base station for random access signal
    CN-103108337-BJune 17, 2015京信通信系统(中国)有限公司一种随机接入信号的检测方法、装置及基站