title: Compressive sensing based Bayesian sparse channel estimation for OFDM communication systems: high performance and low complexity.
abstract: In orthogonal frequency division modulation (OFDM) communication systems, channel state information (CSI) is required at receiver due to the fact that frequency-selective fading channel leads to disgusting intersymbol interference (ISI) over data transmission. Broadband channel model is often described by very few dominant channel taps and they can be probed by compressive sensing based sparse channel estimation (SCE) methods, for example, orthogonal matching pursuit algorithm, which can take the advantage of sparse structure effectively in the channel as for prior information. However, these developed methods are vulnerable to both noise interference and column coherence of training signal matrix. In other words, the primary objective of these conventional methods is to catch the dominant channel taps without a report of posterior channel uncertainty. To improve the estimation performance, we proposed a compressive sensing based Bayesian sparse channel estimation (BSCE) method which cannot only exploit the channel sparsity but also mitigate the unexpected channel uncertainty without scarifying any computational complexity. The proposed method can reveal potential ambiguity among multiple channel estimators that are ambiguous due to observation noise or correlation interference among columns in the training matrix. Computer simulations show that proposed method can improve the estimation performance when comparing with conventional SCE methods.
authors: Department of Communications Engineering, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan.
authors: Guan
authors: 0000-0001-7428-4980
authors: G
authors: Gui
authors: Faculty of Systems Science and Technology, Akita Prefectural University, Akita 015-0055, Japan.
authors: Li
authors: L
authors: Xu
authors: Wireless Network Research Institute, National Institute of Information and Communications Technology (NICT), Yokosuka 239-0847, Japan.
authors: Lin
authors: L
authors: Shan
authors: Department of Communications Engineering, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan.
authors: Fumiyuki
authors: F
authors: Adachi
mesh_terms: D000465:Algorithms; D008962:Models, Theoretical; D013685:Telecommunications; D059015:Wireless Technology