Abstract:

For the problem of the time division data modulation-binary offset carrier (TDDM-BOC) signal under low signal-to-noise ratio, including the blind identification of the subcarrier type and the blind parameters estimation, a revised method using the cyclic spectrum envelope of the signal is proposed. Firstly, the signal model is deduced when the subcarrier type of the TDDM-BOC signal is sine and cosine, respectively. Then the corresponding cyclic spectrum envelope is derived. Finally, the subcarrier identification and parameters estimation can be completed by using the single dimensional search of the cyclic frequency domain. Simulation analysis shows that, for the TDDM-BOC(10, 5) signal, the proposed method is effective in the low signal-to-noise cause.