基于同步头的短波突发波形初始相位估计研究

Research on Initial Phase Estimation of HF Based on Preamble

发送方初始相位的不确定及信号传输信道的影响,使接收信号存在一个固定的相位差现象,这将影响接收机的解调性能,针对此问题,本文根据短波突发波形的帧结构特点提出一种基于同步头的短波信号初始相位估计方法。在高斯白噪声信道下,分析了无频差残留时,相位差对接收机解调性能的影响,并给出了利用同步头估计初始相位的公式及方法。进行了matlab仿真验证,表明同步头估计能够有效地纠正相位偏差,使相位均方根误差控制在4.5°以内。理论与仿真结果均表明,基于同步头的相位差估计是一种非常有效的方法。

The problem that received signal has a fixed phase which would affect the performance of the receiver, The reason is that the uncertainty of the initial phase and affect of the signal transmission channel. To solve the problem, according to the frame structure features of HF burst waveform, the method that estimate initial phase based on Preamble proposed. A the effect of phase in AWGN was analyzed, the formula and method were given using the preamble calculating the initial phase. Matlab simulation verification indicats that the Preamble can effective corrective phase deviation and the RMS of phase error controlled in 4.5°. Theory and simulation show that initial phase estimation based on Preamble is a effective method.