NDLI: Parameter estimation based on factor graph in wide-band OFDM systems

Content Provider	IET Digital Library
Author	Ma, Lili Jiang, Wei Xiang, Haige
Abstract	The channel estimation in a wide-band orthogonal frequency division multiplexing (OFDM) system is different from the narrow-band system, for the estimation parameters should include the Doppler scale factor, which is a particular parameter of the wide-band system. The underwater acoustic OFDM system is a typical wide-band system, and its channel has more than one scale factor usually. For this multi-scale case, the common estimation method is a factor-by-factor process with repeated calculation of the reproduced waveform. This article proposes a factor-graph-based estimation method, which fully uses the restriction relationship among the parameters, and estimates the parameters simultaneously. To reduce the computation load, the modified Bayesian propagation (BP) algorithm is proposed. Comparing to the common BP algorithm, the modified BP algorithm simplifies the calculation of the condition probability in the summation. The simulation results of the mean squared error show that the proposed method is an effective estimation method for the multi-scale wide-band system. The bit error rate performance of the proposed method is very close to the result of the known channel-state-information, and outperforms the fractional Fourier transform (FrFT) and the modified particle swarm optimisation (MPSO) methods for well channel condition.
Starting Page	1793
Ending Page	1800
Page Count	8
ISSN	17518628
Volume Number	13
e-ISSN	17518636
Issue Number	Issue 12, Jul (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/13/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2018.6030
Journal	IET Communications
Publisher Date	2019-04-17
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Acoustic And Other Telecommunication System And Equipment Bit Error Rate Performance Channel Condition Channel Estimation Channel-state-information Combinatorial Mathematics Common BP Algorithm Common Estimation Method Communication Channel Equalisation And Identification Doppler Scale Factor Effective Estimation Method Error Statistics Factor Graph Factor-by-factor Process Fourier Transforms Graph Theory Integral Transforms Modified Bayesian Propagation Algorithm Modified BP Algorithm Modified Particle Swarm Optimisation Method Modulation And Coding Method Multiscale Wide-band System Narrow-band System OFDM Modulation Optimisation Technique Parameter Estimation Particle Swarm Optimisation Probability Statistics Underwater Acoustic Communication Underwater Acoustic System Wide-band OFDM System Wide-band Orthogonal Frequency Division Multiplexing System
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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