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帧同步是突发无线通信系统中的重要技术环节,其虚警概率、检测概率对系统的整体性能有重大影响。文中针对能量检测算法在强干扰条件下虚警概率过高的问题,构造了一种具有恒虚警特性的随机变量,并推导了该变量的检测概率、虚警概率的解析表达式。该变量对干扰功率的变化不敏感,具有区分同步信号与突发强干扰信号的特点。基于所构造的新的随机变量提出了一种双重判决低虚警率帧同步算法,仿真结果表明该算法可有效降低系统的虚警概率,为帧同步信号的设计提供了参考。
Frame synchronization is an important technology in the burst wireless communication system. Its false alarm probability and detection probability have a significant impact on the overall system performance. Aiming at the problem that the false alarm probability of the energy detection algorithm is too high under strong interference conditions, a stochastic variable with constant false alarm characteristics is constructed and the analytic expression of the detection probability and false alarm probability of the variable is derived. This variable is insensitive to the variation of interference power and has the distinguishing characteristics of synchronous signal and sudden strong interference signal. Based on the new random variables constructed, a double-decision low false alarm rate frame synchronization algorithm is proposed. The simulation results show that this algorithm can effectively reduce the false alarm probability and provide a reference for the design of the frame synchronization signal.