Spatial tessellations: concepts and applications of Voronoi diagrams
Spatial tessellations: concepts and applications of Voronoi diagrams
FFT-based preconditioners for Toeplitz-block least squares problems
SIAM Journal on Numerical Analysis
Efficient numerical methods in non-uniform sampling theory
Numerische Mathematik
Matrix computations (3rd ed.)
Fast Iterative Reconstruction of Band-Limited Images from Non-Uniform Sampling Values
CAIP '93 Proceedings of the 5th International Conference on Computer Analysis of Images and Patterns
Introduction to Space-Time Wireless Communications
Introduction to Space-Time Wireless Communications
Nonuniform Sampling of Periodic Bandlimited Signals
IEEE Transactions on Signal Processing - Part I
Parametric Channel Estimation for Pseudo-Random Tile-Allocation in Uplink OFDMA
IEEE Transactions on Signal Processing
Time-Variant Channel Estimation Using Discrete Prolate Spheroidal Sequences
IEEE Transactions on Signal Processing
Performance of Linear Field Reconstruction Techniques With Noise and Uncertain Sensor Locations
IEEE Transactions on Signal Processing - Part I
Reconstruction of Multidimensional Signals From Irregular Noisy Samples
IEEE Transactions on Signal Processing
Closest point search in lattices
IEEE Transactions on Information Theory
Pilot tone selection for channel estimation in a mobile OFDM system
IEEE Transactions on Consumer Electronics
Computationally attractive reconstruction of bandlimited images from irregular samples
IEEE Transactions on Image Processing
Advances in Computational Mathematics
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This paper addresses pilot-assisted channel estimation for wireless orthogonal frequency division multiplexing (OFDM) systems with irregular pilot arrangements. Using nonuniform sampling techniques, we propose a novel channel estimator that is based on conjugate gradient iterations and features very low computational complexity. We investigate the impact of the pilot arrangement on the channel estimation mean square error and we provide a heuristic stopping criterion for early termination of the conjugate gradient iterations. One-dimensional and two-dimensional channel estimator implementations and applications of our method to multiple-antenna and multiuser OFDM systems are discussed. Extensive numerical simulations corroborate that the proposed method performs similarly to computationally much more expensive minimum mean square error estimators.