Journal ArticleDOI
Multislot estimation of frequency-selective fast-varying channels
TLDR
A new subspace-based method is proposed that estimates the channel response from multiple slots by capitalizing on these different varying rates without explicitly computing the delays of the multipath.Abstract:
In mobile communications, the movement of terminals renders the multipath channel time varying. Even though the faded amplitudes are fast varying, the delays can be considered as stationary on a large temporal scale. We propose a new subspace-based method that estimates the channel response from multiple slots by capitalizing on these different varying rates without explicitly computing the delays of the multipath. The temporal subspace is obtained from multiple single-slot training-based estimates of the (single-user or multiuser) channel response. Provided that the number of slots is large enough, the time basis can be calculated with some accuracy. As a consequence, the mean-square error of the channel response depends only on the number of fast-varying parameters that have to be estimated in a slot-by-slot fashion. Performance analysis and simulations confirm the expected benefits of the multislot approach in improving the efficiency of systems with short training sequences.read more
Citations
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Journal ArticleDOI
Pilot-Assisted Time-Varying Channel Estimation for OFDM Systems
TL;DR: This paper proposes novel channel estimators to combat both the noise and the out-of-band interference in orthogonal frequency-division multiplexing (OFDM) systems.
Journal ArticleDOI
Sample Eigenvalue Based Detection of High-Dimensional Signals in White Noise Using Relatively Few Samples
Raj Rao Nadakuditi,Alan Edelman +1 more
TL;DR: A fundamental asymptotic limit of sample-eigenvalue-based detection of weak or closely spaced high-dimensional signals from a limited sample size is highlighted; this motivates the heuristic definition of the effective number of identifiable signals which is equal to the number of ldquosignalrdquo eigenvalues of the population covariance matrix.
Journal ArticleDOI
Soft-Iterative Channel Estimation: Methods and Performance Analysis
TL;DR: A performance comparison is carried out among these estimation methods, both analytically and by numerical simulations, showing the benefits of the proposed approach on the turbo equalizer convergence.
Proceedings ArticleDOI
Coordinated User Scheduling with Transmit Beamforming in the Presence of Inter-Femtocell Interference
TL;DR: Combined use of coordinated user scheduling with transmit beamforming in femtocell networks to mitigate the inter-femtocell interference is considered.
Journal ArticleDOI
SIMO Channel Estimation Using Space-Time Signal Subspace Projection and Soft Information
Shu Cai,Tad Matsumoto,Kehu Yang +2 more
TL;DR: This paper forms the channel estimation under the space-time signal model for this full-row-rank case, and proposes a new method by space- time signal subspace projection using both training and unknown data sequences to improve the accuracy of the channel estimate.
References
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Book
Multiuser Detection
TL;DR: This self-contained and comprehensive book sets out the basic details of multiuser detection, starting with simple examples and progressing to state-of-the-art applications.
Journal ArticleDOI
Detection of signals by information theoretic criteria
Mati Wax,Thomas Kailath +1 more
TL;DR: Simulation results that illustrate the performance of the new method for the detection of the number of signals received by a sensor array are presented.
Book
Principles of mobile communication
TL;DR: The Principles of Mobile Communication, Third Edition stresses the "fundamentals" of physical-layer wireless and mobile communications engineering that are important for the design of "any" wireless system.