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SPCp1-02: Blind Carrier Frequency Offset Estimation for OFDM Systems with DC Offset

Hai Feng Lin, H.M.S.B. Senevirathna, Katsumi Yamashita

Open publisher page 3 citations

Abstract

In wireless OFDM systems, the coexistence of direct current (DC) offset and carrier frequency offset (CFO) will severely degrade the transmission performance. This problem was only partially solved by pilot-aided approaches, at the expense of bandwidth. In this paper, we analyze the subspace structure of the received OFDM signal after coarse DC offset cancelation by time-domain average. Then, a novel blind estimator, which is able to estimate both CFO and DC offset in the absence of the pilot, is proposed. The validity of the proposed estimator is demonstrated by simulation results.

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What this paper is about

In wireless OFDM systems, the coexistence of direct current (DC) offset and carrier frequency offset (CFO) will severely degrade the transmission performance. This problem was only partially solved by pilot-aided approaches, at the expense of bandwidth. In this paper, we analyze the subspace structure of the received OFDM signal after coarse DC offset cancelation by time-domain average. Then, a novel blind estimator, which is able to estimate both CFO and DC offset in the absence of the pilot, is proposed. The validity of the proposed estimator is demonstrated by simulation results.

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OpenAlex reports 3 citations for this work. Citation counts describe recorded attention and do not establish research quality.

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Available abstract

In wireless OFDM systems, the coexistence of direct current (DC) offset and carrier frequency offset (CFO) will severely degrade the transmission performance. This problem was only partially solved by pilot-aided approaches, at the expense of bandwidth. In this paper, we analyze the subspace structure of the received OFDM signal after coarse DC offset cancelation by time-domain average. Then, a novel blind estimator, which is able to estimate both CFO and DC offset in the absence of the pilot, is proposed. The validity of the proposed estimator is demonstrated by simulation results.

Key concepts: Carrier frequency offset, DC bias, Orthogonal frequency-division multiplexing, Estimator, Offset (computer science), Frequency offset, Computer science, Frequency domain

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