Maximum-likelihood carrier frequency offset estimation for OFDM systems over frequency-selective fading channels
Tao Cui,Chintha Tellambura +1 more
- 16 May 2005
- Vol. 4, pp 2506-2510
TL;DR: Three new maximum-likelihood (ML) CFO estimators are derived that can achieve the asymptotic Cramer Rao bound (ACRB) and can also be enhanced using embedded pilots.
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Abstract: This paper considers carrier frequency offset (CFO) estimation for OFDM systems over frequency-selective fading channels. We derive three new maximum-likelihood (ML) CFO estimators. The first estimator takes the pre-DFT signal at the receiver as Gaussian and averages the likelihood function over the Gaussian variable. The other two estimators first remove the channel impulse response (CIR) and average the resulting likelihood function over time-domain transmitted symbols. We demonstrate that the presence of virtual carriers is critically important for estimation. All our proposed estimators can achieve the asymptotic Cramer Rao bound (ACRB) and can also be enhanced using embedded pilots.
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Citations
Semiblind Iterative Data Detection for OFDM Systems with CFO and Doubly Selective Channels
TL;DR: Simulation results show that the proposed data detection algorithm converges in a few iterations and moreover, its performance is close to the ideal case with perfect CFO and channel state information.
Experimental comparison between two fault-tolerant fractional-slot multiphase PM motor drives
Massimo Barcaro,Nicola Bianchi,Emanuele Fornasiero,Freddy Magnussen +3 more
- 04 Jul 2010
TL;DR: An experimental comparison between two fault-tolerant fractional-slot permanent magnet motor drives is presented to highlight the main differences between the two motor drives in terms of their performance under faulty conditions.
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BER of MIMO-OFDM Systems with Carrier Frequency Offset and Channel Estimation Errors
Zhongshan Zhang,Wei Zhang,Chintha Tellambura +2 more
- 24 Jun 2007
TL;DR: Performance analysis of multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) systems with carrier frequency offset and channel estimation errors is considered and the average signal-to-interference-and-noise ratio (SINR) is derived.
Bit error rate approximation of MIMO-OFDM systems with carrier frequency offset and channel estimation errors
TL;DR: The bit error rate (BER) of multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) systems with carrier frequency offset and channel estimation errors is analyzed and the average signal-to-interference-and-noise ratio (SINR) is derived.
MUI-Reducing Spreading Code Design for BS-CDMA in the Presence of Carrier Frequency Offset
Yue Wang,Justin P. Coon +1 more
TL;DR: It is shown through rigorous derivation that all three codes can completely eliminate MUI due to CFO, and despreading codes that were obtained by minimizing the interference power or their cross correlation with the spreading codes are shown to yield a performance close to a synchronous system.
5
References
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TL;DR: In this paper, the joint maximum likelihood (ML) symbol-time and carrier-frequency offset estimator is presented for orthogonal frequency-division multiplexing (OFDM) systems.
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