交替二进制偏移载波信号的多参数盲估计

Multi-parameters blind estimation of AltBOC signal

针对恒包络交替二进制偏移载波(alternate binary offset carrier,AltBOC)信号调制方式复杂,导致信号参数盲估计困难的问题,提出一种基于频域累积的循环谱盲估计算法。首先根据信号模型求取AltBOC信号的循环自相关函数,并将该循环自相关函数等效为16个子信号的循环自相关函数之和;其次利用傅里叶变换分别对其循环谱进行表示,并在此基础上进行频域累积,最后利用信号在循环频率截面上的尖锐脉冲间隔规律估计AltBOC信号的伪码速率、副载波速率以及载频。仿真结果和理论分析表明,该算法对AltBOC信号的多参数估计能得到较为精确的结果。

Aiming at the difficulty of blind estimation of signal parameters caused by the complex modulation mode of alternate binary offset carrier(AltBOC)signal with constant envelope,a blind estimation algorithm of cyclic spectrum based on frequency domain accumulation is proposed.Firstly,according to the signal model,the cyclic autocorrelation function of AltBOC signal can be obtained,which can be equivalent to the sum of the cyclic autocorrelation functions of 16 sub-signals.Secondly,the cycle spectrum represened by using the Fourier transform,and then it is accumulated in the frequency domain.Finally,the pseudo-code rate,subcarrier rate and carrier frequency of AltBOC signal are estimated by using the sharp pulse interval law of the signal on the cycle frequency section.Simulation results and theoretical analyses show that the mult-parameters estimation of AltBOC signal can achieve more accurately.