突发多进制扩频通信中自适应门限检测方法

Adaptive threshold detection method for burst M-ary spread spectrum communication

针对突发多进制扩频通信系统在大频偏情况下的快速可靠检测需求,提出一种自适应门限检测方法。利用多个短码构造前导序列以降低频偏比,将短码相关峰做差分构造新的统计量,并基于信号能量构建恒虚警概率自适应检测门限,在判决时加入滑动窗口以进一步提升检测性能。仿真结果验证了算法可行性。

Aiming at the requirement of reliable fast detection for M-ary orthogonal spread spectrum communication systems in the case of large frequency offset,an adaptive threshold detection method is proposed.Short codes are used to construct the preamble sequence and its correlation peaks are differentiated to generate a new statistic.An adaptive detection threshold of constant false alarm rate is constructed based on signal energy.To improve the detection performance,a sliding window is added in detection judgments.Simulation results verify the feasibility of the algorithm.