NDLI: Sparsity-aware, channel order-blind pilot placement with channel estimation in orthogonal frequency division multiplexing systems

Content Provider	IET Digital Library
Author	Peng, Xiaoqing Wu, Weimin Sun, Jun Liu, Yingzhuang Li, Frank Yong
Abstract	Equispaced pilot arrangement is the most popular scheme for pilot-aided transmission in orthogonal frequency division multiplexing systems. In this study, the authors argue that a non-equispaced pilot pattern may outperform its equispaced counterpart, if they fully take into account the sparsity of the channel impulse response which is inherent in wireless channels. More specifically, a sparsity-aware pilot arrangement scheme based on the coherence criterion is investigated in this study. To address the resulting non-deterministic polynomial (NP)-hard combinatorial optimisation problem, they propose an efficient local search algorithm. For channel estimation, they convert it to a sparse recovery problem. To enhance the applicability of the authors scheme, that is, when there is no prior knowledge about the channel order, they propose to employ the Bayesian information criterion to estimate the channel order first and then recover the sparse channel vector via existing low-complexity methods, for example, orthogonal matching pursuit. By combining the above pilot arrangement scheme with channel estimation, their scheme exhibits substantially better performance in comparison with the conventional equispaced schemes with linear (or spline) interpolation, in terms of total number of pilot symbols and bit error rate.
Starting Page	1182
Ending Page	1190
Page Count	9
ISSN	17518628
Volume Number	9
e-ISSN	17518636
Issue Number	Issue 9, Jun (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/9/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2014.0857
Journal	IET Communications
Publisher Date	2015-04-16
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Bayes Method Bayesian Information Criterion Channel Estimation Channel Impulse Response Channel Order-blind Pilot Placement Combinatorial Mathematics Communication Channel Equalisation And Identification Computational Complexity Local Search Algorithm Modulation And Coding Method NP-hard Combinatorial Optimisation Problem OFDM Modulation Optimisation Technique Orthogonal Frequency Division Multiplexing System Orthogonal Matching Radio Link And Equipment Search Problem Sparse Recovery Problem Sparsity-aware Statistics Transient Response Wireless Channel
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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