Journal of South China University of Technology (Natural Science Edition) ›› 2014, Vol. 42 ›› Issue (3): 21-26.doi: 10.3969/j.issn.1000-565X.2014.03.004

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

Recognition of Subcarriers Modulation Schemes for OFDM Signals in DVB- T System

Li Bing- bing Yang Ji Liu Ming- qian   

  1. State Key Laboratory of Integrated Service Networks,Xidian University,Xi’ an 710071,Shaanxi,China
  • Received:2013-05-23 Revised:2013-11-27 Online:2014-03-25 Published:2014-02-19
  • Contact: 刘明骞(1982-)，男，讲师，博士后研究员，主要从事通信信号处理和通信对抗研究． E-mail:mqliu@mail.xidian.edu.cn
  • About author:李兵兵(1955-)，男，教授，主要从事通信信号处理和数字通信研究．E-mail:bbli@xidian．edu．cn
  • Supported by:

    国家自然科学基金资助项目(61271299);国家 “863” 计划项目(2007AA01Z288);高等学校学科创新引智计划资助项目(B08038)

PDF

886

Abstract:

As the existing subcarrier modulation recognition schemes for OFDM signals is of poor performance overmultipath channels in DVB- T system,a novel recognition scheme is proposed.In this scheme,first,null subcarriersignals are recognized by the normalized power of the subcarriers.Then,pilot subcarrier signals are recognized ac-cording to the correlation coefficient of cyclic spectrum section.Finally,the modulated subcarrier signals are recog-nized with mixed high- order moment to complete the recognition of subcarrier modulation modes for OFDM signals.Simulated results show that the proposed scheme possesses not only good recognition performance but also low com-putation complexity.

Key words: modulation recognition, orthogonal frequency division multiplexing, DVB- T, normalized power, cyclicspectrum, correlation coefficient, mixed high- order moments