An ICI reduction scheme for OFDM system with phase noise over fading channels

Munier, Florent; Eriksson, Thomas; Svensson, Arne

doi:10.1109/tcomm.2008.050063

Cited by 40 publications

(68 citation statements)

References 15 publications

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“…In addition, in OFDM each input symbol had given an independent sub carrier for modulation due to which the OFDM systems are immune to ISI too (Chun et al 2014). The effect of multipath fading had also reduced significantly in OFDM due to the spreading of data on wide range of frequencies (Munier et al 2008). In this paper larger symbol rate of 1024-PSK and 1024-QAM had used for providing higher data rate (Bhatnagar and Hjoungnes 2011).…”

Section: Introductionmentioning

confidence: 89%

Performance analysis of FrFT based OFDM system with 1024-PSK and 1024-QAM modulation under various wireless fading channels

Kansal

Singh

Saxena

2014

Int J Syst Assur Eng Manag

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The problem of scarcity of spectrum had dealt with in this paper; by proposing an FrFT based OFDM system. The performance of system is measured at various values of a, where a is the fractional Fourier transform parameter. The proposed system with 1024-PSK modulation technique as compared to FFT based OFDM system, had achieved BER of 10 -1.8 at 53 dB SNR against 10 -0.4 BER under AWGN channel, 10 -2.5 and 10 -2.4 BER at 62 and 60 dB SNR respectively for Rayleigh and Rician channel respectively at a = 0.4 for AWGN and Rayleigh channel where as a = 0.2 for Rician channel. For Nakagami channel proposed system had achieved BER of 10 -3.0 at 60 dB SNR as compared to 10 -0.9 for same SNR at a = 0.9. With 1024-QAM modulation the proposed system had achieved BER of 10 -2.9 at 14 dB SNR as compared to 10 -0.5 for a = 0.9 under Rayleigh channel. For Rician and Nakagami channels the proposed system achieved BER of 10 -1.9 and 10 -3.0 at 10 and 14 dB SNR respectively as compared to BER of 10 -0.4 for same SNR by FFT based system for a = 0.7 and a = 0.3 for Rican and Nakagami channel respectively.

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Section: Introductionmentioning

confidence: 89%

Performance analysis of FrFT based OFDM system with 1024-PSK and 1024-QAM modulation under various wireless fading channels

Kansal

Singh

Saxena

2014

Int J Syst Assur Eng Manag

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“…The slow-varying phase noise assumption and approximation in (32) is used and verified in the literature, e.g., [5], [7], [27]- [29]. The results in Sec.…”

Section: (31)mentioning

confidence: 94%

“…In order to find the MLE of φ k ,φ k , the LLF in (27) needs to be maximized, where the derivative of L(φ k ) with respect to φ k is determined as…”

Section: Esmentioning

confidence: 99%

On models, bounds, and estimation algorithms for time-varying phase noise

Khanzadi

Mehrpouyan

Alpman

et al. 2011

2011 5th International Conference on Signal Processing and Communication Systems (ICSPCS)

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In this paper, a new discrete-time model of phase noise for digital communication systems, based on a continuoustime representation of time-varying phase noise is derived and its statistical characteristics are presented. The proposed phase noise model is shown to be more accurate than the classical Wiener model. Next, using the this model, non-data-aided (NDA) and decision-directed (DD) maximum-likelihood (ML) estimators of time-varying phase noise are derived. To evaluate the performance of the proposed estimators, the Cramér-Rao lower bound (CRLB) for each estimation approach is derived and by using Monte-Carlo simulations it is shown that the mean-square error (MSE) of the proposed estimators converges to the CRLB at moderate signal-tonoise ratios (SNR). Finally, simulation results show that the proposed estimators outperform existing estimation methods as the variance of the phase noise process increases.

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“…Writing ρ l = a l a0 , and after substituting the expressions of q l (x) we obtain (14), i.e., S1 implies S2. After using Lemma 1, we have S1 equivalent to S2.…”

Section: Regularity Condition 1 There Exists Vectors {Xmentioning

confidence: 99%

Constrained Phase Noise Estimation in OFDM Using Scattered Pilots Without Decision Feedback

Mathecken

Riihonen

Werner

et al. 2017

IEEE Trans. Signal Process.

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Abstract-In this paper, we consider an OFDM radio link corrupted by oscillator phase noise in the receiver, namely the problem of estimating and compensating for the impairment. To lessen the computational burden and delay incurred onto the receiver, we estimate phase noise using only scattered pilot subcarriers, i.e., no tentative symbol decisions are used in obtaining and improving the phase noise estimate. In particular, the phase noise estimation problem is posed as an unconstrained optimization problem whose minimizer suffers from the so-called amplitude and phase estimation error. These errors arise due to receiver noise, estimation from limited scattered pilot subcarriers and estimation using a dimensionality reduction model. It is empirically shown that, at high signal-to-noise-ratios, the phase estimation error is small. To reduce the amplitude estimation error, we restrict the minimizer to be drawn from the so-called phase noise geometry set when minimizing the cost function. The resulting optimization problem is a non-convex program. However, using the S-procedure for quadratic equalities, we show that the optimal solution can be obtained by solving the convex dual problem. We also consider a less complex heuristic scheme that achieves the same objective of restricting the minimizer to the phase noise geometry set. Through simulations, we demonstrate improved coded bit-error-rate and phase noise estimation error performance when enforcing the phase noise geometry. For example, at high signal-to-noise-ratios, the probability density function of the phase noise estimation error exhibits thinner tails which results in lower bit-error-rate.

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An ICI reduction scheme for OFDM system with phase noise over fading channels

Cited by 40 publications

References 15 publications

Performance analysis of FrFT based OFDM system with 1024-PSK and 1024-QAM modulation under various wireless fading channels

Performance analysis of FrFT based OFDM system with 1024-PSK and 1024-QAM modulation under various wireless fading channels

On models, bounds, and estimation algorithms for time-varying phase noise

Constrained Phase Noise Estimation in OFDM Using Scattered Pilots Without Decision Feedback

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