Linear frequency modulated signal detection using wavelet packet, ambiguity function and Radon transform

2002 ◽  
Author(s):  
M.M. Wang ◽  
A.K. Chan ◽  
C.K. Chui
Keyword(s):  
Signal Detection ◽  
Radon Transform ◽  
Wavelet Packet ◽  
Ambiguity Function ◽  
Linear Frequency ◽  
Linear Frequency Modulated Signal

scholarly journals Wigner-Ville Distribution Associated with the Linear Canonical Transform

2012 ◽  
Vol 2012 ◽  
pp. 1-14 ◽  
Author(s):  
Rui-Feng Bai ◽  
Bing-Zhao Li ◽  
Qi-Yuan Cheng
Keyword(s):  
Signal Processing ◽  
Signal Detection ◽  
Transform Domain ◽  
Linear Canonical Transform ◽  
Nonstationary Signal ◽  
Linear Frequency ◽  
Simulation Results ◽  
Definition Of ◽  
Linear Frequency Modulated Signal

The linear canonical transform is shown to be one of the most powerful tools for nonstationary signal processing. Based on the properties of the linear canonical transform and the classical Wigner-Ville transform, this paper investigates the Wigner-Ville distribution in the linear canonical transform domain. Firstly, unlike the classical Wigner-Ville transform, a new definition of Wigner-Ville distribution associated with the linear canonical transform is given. Then, the main properties of the newly defined Wigner-Ville transform are investigated in detail. Finally, the applications of the newly defined Wigner-Ville transform in the linear-frequency-modulated signal detection are proposed, and the simulation results are also given to verify the derived theory.

scholarly journals Cell ID and Timing Estimation Techniques for Underwater Acoustic Cellular Systems in High-Doppler Environments

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4147
Author(s):  
Muhammad Asim ◽  
Mohammed Saquib Khan ◽  
Tae Ho Im ◽  
Yong Soo Cho
Keyword(s):  
Frequency Modulation ◽  
Doppler Shift ◽  
Base Station ◽  
Ambiguity Function ◽  
Cellular Systems ◽  
Linear Frequency Modulation ◽  
Sensor Nodes ◽  
Underwater Acoustic ◽  
Linear Frequency ◽  
The Time Domain

In an underwater acoustic cellular (UAC) system, underwater equipment or sensor nodes need to detect the identity of an underwater base station (UBS) and synchronise it with a serving UBS. It is known that, in an underwater acoustic channel, the temporal variability of the ocean coupled with the low speed of sound in water may induce a significant Doppler shift. In this paper, two different types of cell search techniques (CSTs) are proposed to detect the cell ID and correct timing of the UBS in UAC systems with a Doppler shift: CST based on linear frequency modulation with full bandwidth in the time domain (LFM-FT) and CST based on linear frequency modulation in the frequency domain (LFM-FF). The performances (auto-correlation, cross-correlation, ambiguity function, and cross ambiguity function) of the proposed techniques are analysed and compared with simulation results. It is demonstrated by simulation that the proposed techniques perform better than previous techniques in both AWGN and multipath channels when a Doppler shift exists. It is also shown that the LFM-FF-CST achieves the best performance in the presence of a Doppler shift and is suitable for mobile UAC systems.

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