基于小波变换的一种通信信号码元速率估计算法

Symbol rate estimation algorithm for communication signals based on wavelet transformation

针对通信信号码元速率估计问题,提出基于小波变换的一种估计算法。从二进制相移键控(BPSK)调制信号中提取基带信号,得到其小波变换系数的模值,构建与原调制信号码速率相应的单极性脉冲序列,并分析这些单极性脉冲序列的功率谱,在基带信号码元速率整数倍处提取离散基线,以实现对BPSK信号码元速率的估计。实验结果表明,在低信噪比下本算法具有良好的估计性能,并表现出良好的实用性和鲁棒性。

A new algorithm is proposed for the symbol rate estimation of communication signals based on the wavelet transform. Firstly baseband signal was extracted from the generated Binary Phase Shift Keying （BPSK） modulated signal to obtain the modulus of its wavelet transforming parameter. Secondly, the unipolar pulse sequences corresponding to the original modulated sym- bol rate was established, and the power spectrum of these sequences are also analyzed. At last, discrete baselines were extracted in the integer multiple points of the symbol rate of baseband sig- nals in order to achieve the symbol rate estimation on BPSK signals. The experiments results in- dicated that under low SNR conditions, our proposed algorithm possessed a good estimating performance and showed a better practicality and robustness.