Symbol Rate Estimation Method for Digital Signal Based on Square Timing

Abstract:

In this paper, aiming at the poor performance of the existing symbol rate estimation methods when SNR is low, we proposed a method based on the timing square which can be simply calculated and applied to MASK/MPSK/MQAM modulated signal, improved the performance of signal symbol rate estimation compared with the existing method. Based on the principle of the timing square, the signal modules were squared to calculate the fourier coefficient modulus corresponding to different sampling ratios. Then the characteristic line was searched in the transform spectrum which contains symbol rate information and obtained an estimation of the symbol rate. The impact of the roll-off factor and the carrier wave was analyzed and solution was proposed in this paper. Simulation results show that the performance of symbol rate estimation of the improved method is better than the original method, the wavelet transform method and the cyclostationary method in low SNR and low roll-off factor environment.

• Periodical: Applied Mechanics and Materials (Volumes 536-537)
• Pages: 43-48
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.536-537.43
• Online since: April 2014
• Authors: Wei Wang*, Xiao Yi Zhang, Xiao Yun Teng, Yun Peng Hu
• Keywords: Digital Signal, Fourier Coefficient, Roll-Off Factor, Square Timing, Symbol Rate Estimation

References

[1] Gao Y, Li M, Huang Z. A symbol rate estimation algorithm based on morlet wavelet transform and autocorrelation. In IEEE International Conference on Information, Computing and Telecommunication[C]. Beijing, China, 2009: 239-242.

DOI: 10.1109/ycict.2009.5382378

[2] Yong Q, Guo J W, Fang J X. Wavelet transform based symbol rate estimation of MPSK signals. Communications Technology. 2009, 42(1): 81-83. [In Chinese].

[3] Ming L, Shao Q Y, Qing W. Algorithm for demodulation of MPSK signals based on cyclostationary. Journal of Circuits and Systems, 2007, 12(5): 115-119. [In Chinese].

[4] Yin W X， Wang K． A new method to symbol rate estimation of MPSK signals. IEEE International Conference on Image and Signal Processing [C]. Sanya, China, 2008: 394-397.

DOI: 10.1109/cisp.2008.469

[5] Wei H, Zhong M J. A novel parameter estimation method for 2FSK modulated signal. Communications Technology, 2009, 42(7): 7-9. [In Chinese].

[6] Martin O, Heinrich M. IEEE Trans on Communications. 1988, 36(5): 605-612.

[7] Lei H, Ke X, Hui J C, Kun T. Symbol timing recovery scheme for low roll-off factor shaping pulse. Communication and Network, 2011, 37(8): 117-119. [In Chinese].

[8] Jun D, Yin T Y. An improved algorithm of digital filter andsquare timing in frequency domain. Aeronautical Computing Technique, 2010, 40(1): 105-107, 110.