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Estimation of Channel Transfer Function and Carrier Frequency Offset for OFDM Systems With Phase Noise

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3 Author(s)
Jun Tao ; Dept. of Electr. & Comput. Eng., Univ. of Missouri, Columbia, MO, USA ; Jingxian Wu ; Chengshan Xiao

The joint estimation of carrier frequency offset (CFO) and channel transfer function (CTF) for orthogonal frequency-division multiplexing (OFDM) systems with phase noise is discussed in this paper. A CFO estimation algorithm is developed by exploring the time-frequency structure of specially designed training symbols, and it provides a very accurate estimation of the CFO in the presence of both unknown frequency-selective fading and phase noise. Based on the estimated CFO, phase noise and frequency-selective fading are jointly estimated by employing the maximum a posteriori (MAP) criterion. Specifically, the fading channel is estimated in the form of the frequency-domain CTF. The estimation of the CTF eliminates the requirement of a priori knowledge of channel length, and it is simpler compared with the time-domain channel impulse response (CIR) estimation methods used in the literature. Theoretical analysis with the Cramer-Rao lower bound (CRLB) demonstrates that the proposed CFO and CTF estimation algorithms can achieve near-optimum performance.

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Vehicular Technology, IEEE Transactions on  (Volume:58 ,  Issue: 8 )