Frequency-selective fading channel estimation with a polynomial time-varying channel model

Borah, Deva K.; Hart, B.D.

doi:10.1109/26.771343

Cited by 225 publications

(108 citation statements)

References 21 publications

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“…An improved modeling performance is obtained by the so-called generalized CE-BEM (GCE-BEM) [14], which employs a set of complex exponentials that are more closely spaced in the frequency domain than those related to the traditional CE-BEM. Finally, a great deal of attention goes to the polynomial BEM (P-BEM) [15], [16], which models each tap as a linear combination of a set of polynomials. Its modeling performance is rather sensitive to the Doppler spread though it has a better fit for low Doppler spreads than for high Doppler spreads.…”

mentioning

confidence: 99%

Pilot-Assisted Time-Varying Channel Estimation for OFDM Systems

Tang

Cannizzaro

Leus

et al. 2007

IEEE Trans. Signal Process.

392

338

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Abstract-In this paper, we deal with channel estimation for orthogonal frequency-division multiplexing (OFDM) systems. The channels are assumed to be time-varying (TV) and approximated by a basis expansion model (BEM). Due to the time-variation, the resulting channel matrix in the frequency domain is no longer diagonal, but approximately banded. Based on this observation, we propose novel channel estimators to combat both the noise and the out-of-band interference. In addition, the effect of a receiver window on channel estimation is also studied. Our claims are supported by simulation results, which are obtained considering Jakes' channels with fairly high Doppler spreads.Index Terms-Basis expansion model (BEM), orthogonal frequency-division multiplexing (OFDM), pilot-assisted modulation, time-varying (TV) channels.

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mentioning

confidence: 99%

Pilot-Assisted Time-Varying Channel Estimation for OFDM Systems

Tang

Cannizzaro

Leus

et al. 2007

IEEE Trans. Signal Process.

392

338

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“…For example, trellis-based PSP algorithms for joint estimation of symbols and polynomial BEM [BH99a] coefficients were proposed, for time-selective channels, by Borah and Hart [BH99c] and Leon and Taylor [LT03]. DFE and trellis methods for both polynomial and Karhunen-Loève BEMs [BH99b] were studied by Borah and Hart in [BH99b] for doubly selective channels.…”

Section: Reduced-complexity Trellis-psp Equalization For Single-carrimentioning

confidence: 99%

Equalization of Time-Varying Channels

Schniter

Hwang

Das

et al. 2011

Wireless Communications Over Rapidly Time-Varying Channels

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“…OFDM systems suffer from inter-carrier interference (ICI) in fast fading channels [8]. For these fast fading scenarios, pilot-based LMMSE and least squares (LS) techniques were proposed in [6] and [7], respectively, and a recursive decision-directed LS technique was given in [9]. In [10], low complexity estimation techniques were presented based on a clever selection of pilot blocks.…”

Section: Channel Estimation Problemmentioning

confidence: 99%

Low‐Complexity Techniques

Hanzo

Cherriman

Streit

2007

Video Compression and Communications

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We consider channel identification techniques for a transmission scheme which consists of a sequence of frames with each frame consisting of pilots and data. We consider two systems, the first one having pilots in the time multiplexed fashion, and the second one being a multi-carrier system with frequency multiplexed pilots. We consider scenarios in which the channel is both frequency and time selective.For the time multiplexed pilots system, channel estimation performance of the pilot-only technique is limited by pilot spacing. The standard optimal decisiondirected techniques are computationally expensive. In response, we propose a novel two-stage estimation technique whose performance is close to that of the optimal estimators but whose complexity is significantly less. The first stage finds smoothed estimates of the channel during previous frames, while the second stage uses these smoothed estimates for channel prediction within the current frame.The frequency multiplexed pilots system suffers from the inter-carrier interference (ICI) in doubly-selective channels. We present channel estimation techniques which take the ICI effects into account. We also present a novel pilot tone selection criterion and the theoretical MSE calculations show its efficacy for a wide range of Doppler frequencies. The performance limitation due to ICI can be reduced by employing decision-directed estimators. We develop a low-complexity estimation technique and simulation results show good performance of the proposed techniques.ii The frequency multiplexed pilots system suffers from the inter-carrier interference (ICI) in doubly-selective channels. We present channel estimation techniques which take the ICI effects into account. We also present a novel pilot tone selection criterion and the theoretical MSE calculations show its efficacy for a wide range of Doppler frequencies. The performance limitation due to ICI can be reduced by employing decision-directed estimators. We develop a low-complexity estimation technique and simulation results show good performance of the proposed techniques. I thank my parents and sister, for their love and support. I also thank my uncles, aunts and cousins; they gave me the motivation and inspiration to do well in studies.Time spent together with them has always been so much fun.I thank Praveen, Sib, Aditi, Arul for the fun times during lunch breaks and the tough times while solving homeworks! I thank Ravi for his help with linux and latex.I thank members of the IPS lab for their help and friendly conversations.

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Frequency-selective fading channel estimation with a polynomial time-varying channel model

Cited by 225 publications

References 21 publications

Pilot-Assisted Time-Varying Channel Estimation for OFDM Systems

Pilot-Assisted Time-Varying Channel Estimation for OFDM Systems

Equalization of Time-Varying Channels

Low‐Complexity Techniques

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