时分数据调制偏移载波信号的多参数盲估计

Blind Parameters Estimation of TDDM-BOC Modulation Signal

针对时分数据调制二进制偏移载波(TDDM-BOC)信号副载波速率、伪码速率以及载频等参数盲估计问题,该文提出一种基于频域累积的循环自相关算法。首先在接收端对TDDM-BOC信号求循环自相关函数,再在频域累积,通过检测不同切片上的谱峰间隔,可以同时估计以上多个参数。仿真实验证明了改进型的循环自相关算法能在低信噪比下达到较为精确的估计性能,这为我国"北斗"导航接收机的研发提供了一定的理论参考。

A cyclic autocorrelation algorithm of Time Division Data Modulation Binary Offset Carrier （TDDM- BOC） signal, based on frequency domain accumulation, is proposed to estimate the signal parameters： subcarrier rate, Pseudo Noise （PN） code rate and carrier in multipath fading channel. Firstly, the cyclic autocorrelation of received TDDM-BOC signal is computed, then frequency domain accumulation is used to reduce the influence of noise. Finally, through interval measurement between the peak pulses in different slices, parameters mentioned above can be estimated. Simulation results show that the proposed algorithm is effective and works well under the condition of low Signal-to-Noise Ratio （SNR）, which has a certain reference value for Bei-dou navigation receiver design.