低信噪比下突发通信的同步检测

针对低信噪比下突发通信系统的同步检测问题，提出了一种利用接收信号平均信噪比和瞬时信噪比设置动态检测门限的同步方法，实现了信号检测门限的设置与信号脉冲出现时刻噪声能量的自适应匹配，提高了低信噪比下同步检测概率。计算机仿真表明在同步序列长度为63时，信号的有效检测工作信噪比可以降低到-5 dB。该方法适合于低信噪比下运动平台间的突发通信系统。

Synchronization detection at low SNR in burst communication system

In order to deal with the problem of synchronization detection in burst communication system at low signal-to-noise ratio(SNR),a synchronization method is proposed which uses the average SNR and instantaneous SNR of the received signal to set the detection threshold dynamically. The method achieves an adaptive matching for the setting of the signal detection threshold with the noise energy at the pilot signal location,and improves the synchronization detection probability at low SNR. The simulations show that the required SNR of effective signal detection can be reduced to -5 dB when using a 63-length pilot sequence.The method can be applied in burst communication between moving platforms at low SNR.