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.


Electrical and Computer Engineering


National Science Foundation (U.S.)
United States. Office of Naval Research

Keywords and Phrases

Carrier Frequency Offset (CFO); Channel Estimation; Channel Transfer Function (CTF); Maximum a Posteriori (MAP); Orthogonal Frequency-Division Multiplexing (OFDM); Phase Noise

Document Type

Article - Journal

Document Version

Final Version

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© 2009 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

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