Proceedings ArticleDOI
Robust channel estimation for OFDM systems with rapid dispersive fading channels
Ye Li,Leonard J. Cimini,Nelson Sollenberger +2 more
- Vol. 3, pp 1320-1324
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TLDR
A minimum mean-square-error (MSE) channel estimator is derived, which makes full use of the time- and frequency-domain correlations of the frequency response of time-varying dispersive fading channels and can significantly improve the performance of OFDM systems in a rapid dispersion fading channel.Abstract:
Orthogonal frequency division multiplexing (OFDM) modulation is a promising technique for achieving the high-bit-rates required for a wireless multimedia service. Without channel estimation and tracking, OFDM systems have to use differential phase-shift keying (DPSK), which has a 3 dB signal-to-noise ratio (SNR) loss compared with coherent phase-shift keying (PSK). To improve the performance of OFDM systems by using coherent PSK, we investigate robust channel estimation for OFDM systems. We derive a minimum mean-square-error (MSE) channel estimator, which makes full use of the time- and frequency-domain correlations of the frequency response of time-varying dispersive fading channels. Since the channel statistics are usually unknown, we also analyze the mismatch of the estimator to channel statistics and propose a robust channel estimator that is insensitive to the channel statistics. The robust channel estimator can significantly improve the performance of OFDM systems in a rapid dispersive fading channel.read more
Citations
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Journal ArticleDOI
A comparison of pilot-aided channel estimation methods for OFDM systems
M. Morelli,U. Mengali +1 more
TL;DR: Two pilot-aided schemes for the estimation of the channel impulse response (CIR) in orthogonal frequency division multiplexed (OFDM) systems are focused on: the maximum likelihood estimator (MLE) and the Bayesian minimum mean square error estimators (MMSEE).
Journal ArticleDOI
Coherent optical OFDM: theory and design.
TL;DR: The receiver-based digital signal processing to mitigate self-phase-modulation (SPM) and Gordon-Mollenauer phase noise, which is equivalent to the midspan phase conjugation is shown.
Journal ArticleDOI
A Survey on Wireless Security: Technical Challenges, Recent Advances and Future Trends
TL;DR: In this article, a comprehensive overview of security attacks encountered in wireless networks is presented in view of the network protocol architecture, where the potential security threats are discussed at each protocol layer.
Journal ArticleDOI
Bounds on the interchannel interference of OFDM in time-varying impairments
Ye Li,Leonard J. Cimini +1 more
TL;DR: Tight and universal bounds have been derived for the interchannel interference (ICI) of an orthogonal frequency-division multiplexing (OFDM) signal resulting from Doppler spread.
Journal ArticleDOI
Multiuser MIMO-OFDM for Next-Generation Wireless Systems
Ming Jiang,Lajos Hanzo +1 more
TL;DR: It is demonstrated that the family of GA-aided MUDs is capable of achieving a near-optimum performance at the cost of a significantly lower computational complexity than that imposed by their optimum maximum-likelihood (ML) MUD aided counterparts.
References
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Self-Recovering Equalization and Carrier Tracking in Two-Dimensional Data Communication Systems
TL;DR: This paper solves the general problem of adaptive channel equalization without resorting to a known training sequence or to conditions of limited distortion.
Journal ArticleDOI
Analysis and Simulation of a Digital Mobile Channel Using Orthogonal Frequency Division Multiplexing
TL;DR: The analysis and simulation of a technique for combating the effects of multipath propagation and cochannel interference on a narrow-band digital mobile channel using the discrete Fourier transform to orthogonally frequency multiplex many narrow subchannels, each signaling at a very low rate, into one high-rate channel is discussed.