Journal of South China University of Technology (Natural Science Edition) ›› 2015, Vol. 43 ›› Issue (9): 39-46.doi: 10.3969/j.issn.1000-565X.2015.09.007

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

Effect of Carrier Frequency Offsets on Performance of OFDM AF Relay System

Li Ju-hu1  Nie Juan2    

  1. 1． School of Information，Beijing Forestry University，Beijing 100083，China; 2． College of Computer and Information Engineering，Beijing University of Agriculture，Beijing 102206，China
  • Received:2015-03-16 Revised:2015-04-23 Online:2015-09-25 Published:2015-09-07
  • Contact: 李巨虎(1978-)，男，博士，讲师，主要从事物联网、无线通信等研究． E-mail:lijuhu@ bjfu.edu.cn
  • About author:李巨虎(1978-)，男，博士，讲师，主要从事物联网、无线通信等研究．
  • Supported by:
    Supported by the General Program of Beijing Committee of Education Science and Technology(KM20151002)

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Abstract: This paper deals with the bit error rate (BER) and outage probability of a dual hop OFDM AF relay sys-
tem in the presence of carrier frequency offsets (CFO)． First，the signal-to-noise ratio (SNR) of the system and its probability distribution are put forward in the presence of CFO，and then the close-form expressions of the BER and outage probability of the system are derived with CFO in Ｒayleigh fading channels． In order to provide more insights，the error floors of the BEＲ and outage probability of the system are also obtained． Moreover，a theoretical analysis is proved to be correct by simulation． The theoretical analysis and simulation results indicate that，in the presence of CFO，the BER and outage probability of the system tend to be the error floor but not zero even at a high SNＲ，and that the performance of OFDM AF relay system is very sensitive to the CFO，and the system performance gets worse rapidly with the increases of the CFO and the SNR．

Key words: amplify-and-forward, orthogonal frequency division multiplexing, carrier frequency offsets, outage
probability, bit error rate