APSK长突发信号的动态载波相位跟踪
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摘要
APSK已被用于宽带数字卫星通信,在采用APSK长突发的卫星通信中,需要对一帧内的载波相位动态变化进行跟踪。针对粗载波同步和符号同步完成后的长突发APSK调制信号,提出一种新的载波跟踪方案,该方案采用一种基于星座分割的NDA鉴相算法,使用两个二阶锁相环,并借助于一个很短的独特码解相位模糊,可在很高的数据传输效率下,克服一般闭环法的捕获时间问题,实现对整帧信号载波相位的顺利跟踪。
APSK modulation has been adopted in wideband digital satellite communications.In long-burst digital communications with APSK modulation,carrier phase varies with time and carrier tracking is required.A new method for tracking dynamic phase of long-burst APSK modulated signals after rough frequency recovery and timing recovery is proposed.Using a phase detection algorithm based on constellation partition,two second order PLLs,and with the aid of a short unique word,the proposed structure can successfully track the frequency and phase offset of the whole burst,allowing high data transmission efficiency.
APSK modulation has been adopted in wideband digital satellite communications.In long-burst digital communications with APSK modulation,carrier phase varies with time and carrier tracking is required.A new method for tracking dynamic phase of long-burst APSK modulated signals after rough frequency recovery and timing recovery is proposed.Using a phase detection algorithm based on constellation partition,two second order PLLs,and with the aid of a short unique word,the proposed structure can successfully track the frequency and phase offset of the whole burst,allowing high data transmission efficiency.
引文
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[11]VITERBI A J,VITERBI A M.Nonlinear estimation of PSK-modulated carrier phase with application to burst digital transmission[J].IEEETrans.Inf.Theory,1983,29:543-551.