scholarly journals Sparse channel estimation of underwater acoustic orthogonal frequency division multiplexing based on basis pursuit denoising

2015 ◽  
Vol 64 (6) ◽  
pp. 064301
Author(s):  
Yin Yan-Ling ◽  
Qiao Gang ◽  
Liu Song-Zuo ◽  
Zhou Feng
Keyword(s):  
Channel Estimation ◽  
Orthogonal Frequency Division Multiplexing ◽  
Basis Pursuit ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Underwater Acoustic ◽  
Sparse Channel Estimation ◽  
Sparse Channel

scholarly journals Pilot Design for Sparse Channel Estimation in Orthogonal Frequency Division Multiplexing Systems

2018 ◽  
Vol 2 ◽  
pp. 60-68 ◽  
Author(s):  
P. Vimala ◽  
G. Yamuna
Keyword(s):  
Channel Estimation ◽  
Compressive Sensing ◽  
Fading Channel ◽  
Orthogonal Frequency Division Multiplexing ◽  
Wide Band ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Ofdm Systems ◽  
Sparse Channel Estimation ◽  
Sparse Channel

Orthogonal Frequency Division Multiplexing (OFDM) is a well-known technique used in modern wide band wireless communication systems. Coherent OFDM systems achieve its advantages over a multipath fading channel, if channel impulse response is estimated precisely at the receiver. Pilot-aided channel estimation in wide band OFDM systems adopts the recently explored compressive sensing technique to decrease the transmission overhead of pilot subcarriers, since it exploits the inherent sparsity of the wireless fading channel. The accuracy of compressive sensing techniques in sparse channel estimation is based on the location of pilots among OFDM subcarriers. A sufficient condition for the optimal pilot selection from Sylow subgroups is derived. A Sylow subgroup does not exist for most practical OFDM systems. Therefore, a deterministic pilot search algorithm is described to select pilot locations based on minimizing coherence, along with minimum variance. Simulation results reveal the effectiveness of the proposed algorithm in terms of bit error rate, compared to the existing solutions.

scholarly journals Channel Modelling and Estimation for Shallow Underwater Acoustic OFDM Communication via Simulation Platform

2019 ◽  
Vol 9 (3) ◽  
pp. 447 ◽  
Author(s):  
Xiaoyu Wang ◽  
Xiaohua Wang ◽  
Rongkun Jiang ◽  
Weijiang Wang ◽  
Qu Chen ◽  
...  
Keyword(s):  
Channel Estimation ◽  
Orthogonal Frequency Division Multiplexing ◽  
Cost Effective ◽  
Accurate Method ◽  
Frequency Division Multiplexing ◽  
Simulation Platform ◽  
Frequency Division ◽  
Underwater Acoustic ◽  
Channel Modelling ◽  
Input Parameters

The performance of underwater acoustic (UWA) communication is heavily dependent on channel estimation, which is predominantly researched by simulating UWA channels modelled in complex and dynamic underwater environments. In UWA channels modelling, the measurement-based approach provides an accurate method. However, acquirement of environment data and simulation processes are scenario-specific and thus not cost-effective. To overcome such restraints, this article proposes a comprehensive simulation platform that combines UWA channel modelling with orthogonal frequency division multiplexing (OFDM) channel estimation, allowing users to model UWA channels for different ocean environments and simulate channel estimation with configurable input parameters. Based on the simulation platform, three independent

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