基于峰值过滤的SC-FDMA系统的测距检测方法

An Initial Ranging Detection Algorithm Based on Peak-Filtering in SC-FDMA System

该文针对单载波频分复用多址系统,设计了一种基于频域集中式载波分配和时域循环移位的测距信号时频结构,并提出基于峰值过滤概念的自适应门限算法来估计干扰和噪声能量项,用于测距信号的检测。理论分析和仿真结果表明,当测距信号采用不同的根序列和不同的循环移位长度时,该文提出的方法和传统的相关值能量集平均方法相比,在99%概率的成功检测下,信号与干扰噪声能量比需求降低了0.5~1 dB,同时虚警概率也得到了控制。

In this paper, based on localized subcarrier allocation in frequency domain and cyclic-shift allocation in time domain, a kind of ranging time and frequency structure for SC-FDMA system is designed, and adaptive detection threshold＇s computing method based on concept of peak-filtering to estimate interference and noise power is proposed for the detection of ranging signal. Theoretical analysis and simulation results show that, while ranging signals adopt different ranging code and different cyclic-shift, SINR requirements of 99% successful detection get reduce by 0.5-1 dB compared with traditional method adopting ensemble average correlation power, and the probabilities of false alarm get controlled in the meantime.