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| New Frequency Offset Estimation Methods for OFDM Systems by Using CAZAC Sequence |
| Yan Chun-lin; Li Shao-qian; Tang You-xi; Luo Xiao; Fang Jia-yi |
| National Key Lab. of Communication, University of Electronic of Science and Technology of China, Chengdu 610054, China |
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Abstract In this paper a new method for frequency offset estimation is proposed where the training sequence is composed of two Constant Amplitude Zero Auto Correlation (CAZAC) sequences in one OFDM symbol and the frequency offset up to OFDM bandwidth can be detected. The training sequence also can be used for channel estimation and equalization. This will enhance the efficiency of data transmission. Cramer-Rao bound can be reached in the estimation. The valid of the algorithm is verified in AWGN channel and Rayleigh channel.
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Received: 14 June 2004
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2006, Vol. 28 
