Coherent communications over doubly-selective fading channels are attracting increasing research interests because of the performance advantage over their noncoherent counterparts. In this paper, we use a simple windowing and dewindowing technique to improve the accuracy of an existing basis expansion model (BEM) and develop a windowed least-squares (WLS) estimator for doubly-selective fading channels. We also design the optimum pilot pattern for the WLS estimator. Our designs can considerably improve the channel estimation performance. Simulations are provided to corroborate our theoretical analysis.
Bibliographical noteFunding Information:
This work is in part supported by the National Science Foundation under grant No. ECS-0621879, and by the Office of Naval Research under grant No. N00014-07-1-0193. Part of the results in this paper was presented at CISS 2008, Princeton, NJ. Digital Object Identifier 10.1109/TWC.2010.04.080631
- Basis expansion model
- Channel estimation
- Discrete Fourier transform
- Least squares