Carrier Frequency Recovery Technique in OFDM Systems

Authors:
Bo Ai;Jian-Hua Ge;Dian-Fu Zhang;Jun Liu;Yong Wang;Zhen Lu
Affiliations:
Aff1 Aff2;National Key Laboratory of Integrated Service Networks, Xidian University, Xi'an, China 710071;Engineering Institute of Armed Police Force, Xi'an, China 710086;Engineering Institute of Armed Police Force, Xi'an, China 710086;National Key Laboratory of Integrated Service Networks, Xidian University, Xi'an, China 710071;Shanghai Jiaotong University, Shanghai, China 200030
Venue:
Wireless Personal Communications: An International Journal
Year:
2005

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Abstract

Orthogonal frequency division multiplexing (OFDM) systems are highly sensitive to carrier frequency errors. In this paper, a new method utilizing pilots to do frequency synchronization in frequency domain is proposed with large estimation range. It needs no such prerequisite assumption that a perfect symbol timing synchronization [IEEE Transactions on Communications 42 (1994) 2908; 45 (1997) 1613] has been done before performing integer carrier frequency synchronization. Also, a new adjusting model for fine carrier frequency is proposed. Simulation and performance analysis show that our overall frequency estimator has high accuracy. The corresponding FPGA circuit through test in high definition TV (HDTV) prototype in Team of Expert Engineering Group (TEEG) in China proves its availability and feasibility.