A Sparse CoSaMP Channel Estimation Algorithm With Adaptive Variable Step Size for an OFDM System

Compressive sampling matching pursuit (CoSaMP), as a conventional algorithm requiring system sparsity and sensitive to step size, was improved in this paper by approximating the sparsity with adaptive variable step size. In the proposed algorithm (CoSaMP with variable step size abbreviated as Vss-Co...

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Bibliographic Details
Published in:International Journal of Aerospace Engineering Vol. 2024; pp. 1 - 11
Main Authors: Xiaoling, Ning, Yangyi, Chen, Linsen, Zhang
Format: Journal Article
Language:English
Published: New York Hindawi 14.05.2024
John Wiley & Sons, Inc
Wiley
Subjects:
Acoustics
Adaptive algorithms
Algorithms
Analysis
Approximation
Forecasts and trends
Fourier transforms
Signal to noise ratio
Sparsity
compressive sampling matching pursuit (CoSaMP)
sparsity
orthogonal frequency division multiplexing (OFDM)
adaptive variable step size
iteration termination condition
sparsity adaptive matching pursuit (SAMP)
ISSN:1687-5966, 1687-5974
Online Access:Get full text
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Summary:Compressive sampling matching pursuit (CoSaMP), as a conventional algorithm requiring system sparsity and sensitive to step size, was improved in this paper by approximating the sparsity with adaptive variable step size. In the proposed algorithm (CoSaMP with variable step size abbreviated as Vss-CoSaMP), the idea of approximating sparsity with adaptive step size was borrowed from the sparsity adaptive matching pursuit (SAMP) algorithm to determine the sparsity for the CoSaMP algorithm. The applicability of the CoSaMP algorithm was therefore expanded considerably. On this basis, a step size reduction was added as the iteration termination condition of an orthogonal frequency division multiplexing (OFDM) system. An adaptive variable step size algorithm was then put forward to address the CoSaMP algorithm’s sensitivity to step size. It could realize the required precision at different initial step sizes. A simulation was carried out to analyze the influence of pilot number and step size in an OFDM system on the algorithm. The algorithms, including SAMP, CoSaMP, and Vss-CoSaMP, were compared with two sparse channels, revealing that the Vss-CoSaMP algorithm overcame the problem of the CoSaMP algorithm, that is, the impossibility to forecast the channel sparsity. With the adaptive step size, the proposed algorithm could reach and achieve better accuracy than the CoSaMP algorithm. Additionally, the proposed algorithm was superior over the SAMP algorithm in terms of reconstruction, mean square error (MSE), and bit error ratio (BER).
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ISSN:1687-5966
1687-5974
DOI:10.1155/2024/8897214