Anti-eavesdropping FrFT-OFDM system exploiting multipath channel characteristics

2017 ◽  
Vol 11 (9) ◽  
pp. 1371-1378 ◽  
Author(s):  
Teng Wang ◽  
Hao Huan ◽  
Ran Tao ◽  
Yue Wang
Keyword(s):  
Multipath Channel ◽  
Ofdm System ◽  
Channel Characteristics

scholarly journals SDR Based Indoor Beacon Localization Using 3D Probabilistic Multipath Exploitation and Deep Learning

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1323 ◽  
Author(s):  
Donald L. Hall ◽  
Ram M. Narayanan ◽  
David M. Jenkins
Keyword(s):  
Deep Learning ◽  
Software Defined Radio ◽  
High Performance ◽  
Nearest Neighbor ◽  
Indoor Localization ◽  
Signal Propagation ◽  
Multipath Channel ◽  
K Nearest Neighbor ◽  
Positioning Systems ◽  
Channel Characteristics

Wireless indoor positioning systems (IPS) are ever-growing as traditional global positioning systems (GPS) are ineffective due to non-line-of-sight (NLoS) signal propagation. In this paper, we present a novel approach to learning three-dimensional (3D) multipath channel characteristics in a probabilistic manner for providing high performance indoor localization of wireless beacons. The proposed system employs a single triad dipole vector sensor (TDVS) for polarization diversity, a deep learning model deemed the denoising autoencoder to extract unique fingerprints from 3D multipath channel information, and a probabilistic k-nearest-neighbor (PkNN) to exploit the 3D multipath characteristics. The proposed system is the first to exploit 3D multipath channel characteristics for indoor wireless beacon localization via vector sensing methodologies, a software defined radio (SDR) platform, and multipath channel estimation.

scholarly journals New Solution for Reducing Doppler Shift in the MB-OFDM System Over High Mobility Multipath Channel for V&I Communication

2015 ◽  
Vol 12 (3) ◽  
pp. 166-173
Author(s):  
Sanaa Kabil ◽  
Raja Elassali ◽  
Fouzia Elbahhar ◽  
Brahim Ait Essaid ◽  
Abdellah Ait Ouahman
Keyword(s):  
Doppler Shift ◽  
High Mobility ◽  
Multipath Channel ◽  
Ofdm System

scholarly journals Improved Timing Estimation Using Iterative Normalization Technique for OFDM Systems

2017 ◽  
Vol 7 (2) ◽  
pp. 905
Author(s):  
Suyoto Suyoto ◽  
Iskandar Iskandar ◽  
Sugihartono Sugihartono ◽  
Adit Kurniawan
Keyword(s):  
Computer Simulation ◽  
Detection Probability ◽  
Multipath Channel ◽  
Delay Spread ◽  
Ofdm Systems ◽  
Ofdm System ◽  
Timing Estimation ◽  
Multipath Environment ◽  
Channel Environment ◽  
Statistical Change

<p>Conventional timing estimation schemes based on autocorrelation experience performance degradation in the multipath channel environment with high delay spread. To overcome this problem, we proposed an improvement of the timing estimation for the OFDM system based on statistical change of symmetrical correlator. The new method uses iterative normalization technique to the correlator output before the detection based on statistical change of symmetric correlator is applied. Thus, it increases the detection probability and achieves better performance than previously published methods in the multipath environment. Computer simulation shows that our method is very robust in the fading multipath channel</p>

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