Channel estimation for non-ideal OFDM systems

Montojo, Juan; Milstein, L.B.

doi:10.1109/tcomm.2010.01.070650

Cited by 14 publications

(2 citation statements)

References 26 publications

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“…Therefore, in order to improve the system performance, it is important to find the actual delayed timing in multipath fading channels at the receiver. In addition, channel estimation also plays a crucial role in providing the channel information to the soft decoder and compensating the signal during the demodulation process [4]. Without the knowledge of timing offset and channel information at the receiver, the system will have a poor performance during the entire data transmission.…”

Section: Introductionmentioning

confidence: 99%

Semiblind frequency-domain timing synchronization and channel estimation for OFDM systems

Kung

Parhi

2013

EURASIP J. Adv. Signal Process.

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In this article, we propose unit vectors in the high dimensional Cartesian coordinate system as the preamble, and then propose a semiblind timing synchronization and channel estimation scheme for orthogonal frequency division multiplexing (OFDM) systems. Due to the lack of useful information in the time-domain, a frequency-domain timing synchronization algorithm is proposed. The proposed semiblind approach consists of three stages. In the first stage, a coarse timing offset related to the delayed timing of the path with the maximum gain in multipath fading channels is obtained. Then, a fine time adjustment algorithm is performed to find the actual delayed timing in channels. Finally, the channel response in the frequency-domain is obtained based on the final timing estimate. Although the required number of additions in the proposed algorithm is higher than those in conventional methods, the simulation results show that the proposed approach has excellent performance of timing synchronization in several channel models at signal-to-noise ratio (SNR) smaller than 6 dB. In addition, for a low-density parity-check coded single-input single-output OFDM system, our proposed approach has better bit-error-rate performance than conventional approaches for SNR varying from 3 to 8 dB.

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Section: Introductionmentioning

confidence: 99%

Semiblind frequency-domain timing synchronization and channel estimation for OFDM systems

Kung

Parhi

2013

EURASIP J. Adv. Signal Process.

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“…According to the model of OFDM system given in literature [2,3], the theory of fractional space given in literature [4,5] and channel estimation given in literature [6,7,8], fractionally spaced frequency equalization algorithm for OFDM jointing with modified pilot sequences is proposed. Because the length and structure of sending pilot sequences are improved and fractional spaced is introduced, the performance of system can be well enhanced.…”

Section: Introductionmentioning

confidence: 99%

Fractionally Spaced Frequency Equalization Method for Orthogonal Frequency Division Multiplexing (OFDM) Jointing with Modified Pilot Sequences

Guo

et al. 2012

AMM

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In order to obtain accurate and high-speed data transmission, the orthogonal frequency division multiplexing(OFDM) technology is introduced and it is a kind of a multi-carriers modulation technology with high efficiency in the use of frequency band and characteristics of strong anti-interference ability. The fractionally spaced OFDM frequency domain equalization algorithm based on modified pilot sequences is proposed. In this proposed algorithm, one-dimensional linear interpolation method is used to estimate the frequency domain response of all subcarriers by part of the subcarriers’ frequency domain response with reducing the number of transmitted pilot sequences, and received signals are oversampled to acquire more detailed channel information. The computer simulations in underwater acoustic channel show that the performance of proposed method outperforms the single-carrier system and traditional OFDM system.

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An algebraic continuous time parameter estimation for a sum of sinusoidal waveform signals

Ushirobira

Perruquetti

Mboup

2016

Adaptive Control & Signal

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International audienceIn this paper, a novel algebraic method is proposed to estimate amplitudes, frequencies, and phases of a biased and noisy sum of complex exponential sinusoidal signals. The resulting parameter estimates are given by original closed formulas, constructed as integrals acting as time-varying filters of the noisy measured signal. The proposed algebraic method provides faster and more robust results, compared with usual procedures. Some computer simulations illustrate the efficiency of our method

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Channel estimation for non-ideal OFDM systems

Cited by 14 publications

References 26 publications

Semiblind frequency-domain timing synchronization and channel estimation for OFDM systems

Semiblind frequency-domain timing synchronization and channel estimation for OFDM systems

Fractionally Spaced Frequency Equalization Method for Orthogonal Frequency Division Multiplexing (OFDM) Jointing with Modified Pilot Sequences

An algebraic continuous time parameter estimation for a sum of sinusoidal waveform signals

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