The invention discloses a method for detecting a PRACH preamble signal, which mainly aims at receiving the 4 antenna in the uplink of the LTE system. The method first determines the approximate relationship between the probability of false alarm and false alarm threshold, the false alarm probability for a given, according to the approximate linear solution before the amendment of the false alarm threshold T, and then the received signal receiver by non coherent length of the output signal after the merger in a group of sequences of Z Ns (n), according to the simulation the experience of Z (n) sequence to remove the maximum value in a few, the sequence length of Ns which is the size of a slot length or length of a sub frame or sub frame length; according to the calculated correction correction relation of false alarm threshold after false alarm threshold, when the sequence of Z (n) is greater than the corrected false alarm threshold value, the received signal is a random access request. The method can obtain effective false alarm threshold simply and quickly.
【技术实现步骤摘要】
【技术保护点】
一种检测PRACH前导信号的方法,包括如下步骤: (1)对虚警概率与虚警门限的关系式P↓[fa](z)=e↑[-2z](1+2z+2z↑[2]+4z↑[3]/3)两边取对数,得到两者的对数关系式,其中P↓[fa](z,k)为虚警概率,z为虚警门限; (2)确定虚警概率与虚警门限的对数关系式表示的曲线的近似直线; (3)对给定的虚警概率,根据所述近似直线求解修正前的虚警门限; (4)取接收机接收的前导信号经非相干合并后的输出信号中长度为Ns的一组序列z(n),根据仿真经验去掉序列z(n)中的最大值,得到结果序列其中长度Ns的大小为一个时隙长度或一个子帧长度或多个子帧长 ...
【技术特征摘要】
【专利技术属性】
技术研发人员:刘可文,李平安,方秋巳,柯勇,祁万军,
申请(专利权)人:武汉理工大学,
类型:发明
国别省市:83
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