scholarly journals Enhancing V2X Communication Based on a New Comb-Pilot Estimation Approach

2016 ◽  
Vol 2016 ◽  
pp. 1-14
Author(s):  
Aymen Sassi ◽  
Yassin El Hillali ◽  
Atika Revenq ◽  
Faiza Charfi ◽  
Lotfi Kamoun
Keyword(s):  
Performance Evaluation ◽  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
Performance Enhancement ◽  
Human Life ◽  
Ieee 802.11P ◽  
Vehicle To Vehicle ◽  
Pilot Symbols ◽  
Quality Of Transmission

Vehicle to Vehicle (V2V) and Vehicle to Infrastructure (V2I) communication systems, known as V2X technologies, have increasingly attracted attention in current research on road safety and traffic ergonomics. The performance evaluation of these communication systems is an important step before their potential integration and use in real systems. V2X communications are based on the IEEE 802.11p standard also known as Wireless Access in Vehicular Environment (WAVE). V2X can affect human life; therefore a deep study related to V2X performance evaluation should be done in order to be sure about the system reliability. In this context, we have elaborated a deep study related to the effect of transmission range on V2X communications by considering the terminal mobility. First, we have evaluated the performance of the PHY layer on the IEEE 802.11p using simulation. Secondly, we have conducted real case measurements using the Arada LocoMate Transmission system. The obtained results shows the necessity to optimize the quality of transmission in V2X communications. Consequently, we propose in this paper a new comb-pilot technique to enhance the quality of Orthogonal Frequency Division Multiplexing (OFDM) transmission. Our proposal consists in two new uses of the pilot subcarrier estimation technique in order to decrease the elevated bit error rate (BER). The quality of transmission (QoT) is first evaluated relating to the pilot symbol rearranged positions. Second, we proposed to optimize the QoT by adding two supplementary pilot symbols as it can offer better channel estimation results. Based on the performance evaluation of our proposal, it is confirmed that both of rearrangement and the adding of the pilot patterns lead to performance enhancement compared to baseline model (standardized one).

BER Improvement in OFDM Systems Using Wavelet Transform Based on Kalman Filter

2020 ◽  
pp. 102-124
Author(s):  
Sajjan Singh
Keyword(s):  
Kalman Filter ◽  
Wavelet Transform ◽  
Fading Channels ◽  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Performance Enhancement ◽  
Average Power ◽  
Discrete Wavelet ◽  
Rate Analysis

Orthogonal frequency division multiplexing (OFDM) is an efficient method of data transmission for high speed communication systems over multipath fading channels. However, the peak-to-average power ratio (PAPR) is a major drawback of multicarrier transmission systems such as OFDM is the high sensitivity of frequency offset. The bit error rate analysis (BER) of discrete wavelet transform (DWT)-OFDM system is compared with conventional fast Fourier transform (FFT)-OFDMA system in order to ensure that wavelet transform based OFDMA transmission gives better improvement to combat ICI than FFT-based OFDMA transmission and hence improvement in BER. Wavelet transform is applied together with OFDM technology in order to improve performance enhancement. In the proposed system, a Kalman filter has been used in order to improve BER by minimizing the effect of ICI and noise. The obtained results from the proposed system simulation showed acceptable BER performance at standard SNR.

scholarly journals MATLAB Simulation of IEEE802.11p Technology on High User’s Mobility

2021 ◽  
Author(s):  
abderrahim mountaciri
Keyword(s):  
Phase Shift ◽  
Doppler Effect ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Physical Layer ◽  
Lms Algorithm ◽  
Ieee 802.11P ◽  
Vehicular Communication ◽  
Matlab Simulation ◽  
Vehicle To Vehicle

Abstract In this article proposed IEEE 802.11p Physical layer (PHY). A MATLAB simulation is performed to analyze the baseband processing of the transceiver. Orthogonal Frequency Division Multiplexing (OFDM) is applied in this project according to the IEEE 802.11p standard, which allows data transmission rates from 3 to 27 Mbps. Separate modulation schemes, bit phase shift modulation (BPSK), quadrate phase shift modulation (QPSK), and quadrature amplitude modulation (QAM), are used for different data rates. These schemes are combined with time interleaving and a convolutional error correction code. A guard interval is inserted at the start of the transmitted symbol to reduce the effect of intersymbol interference (ISI). This article studies the PHY physical layer of the IEEE 802.11p vehicular communication standard. An IEEE.802.11p PHY model, with many associated phenomena, is implemented in the V2V vehicle-to- vehicle, and the vehicle-to-vehicle ad hoc network (VANET) provides convenient coordination between moving vehicles. A moving vehicle could move at a very high speed, producing a Doppler effect that damages OFDM symbols and also causes inter-carrier interference (ICI). This article has discussed VANET technology versus 802.11a technology, as they have many differences when it comes to user mobility. The Doppler effect resulting from the mobility of the user with a high speed of 25 to 400 km / h has been studied as the main parameter, the estimation of the channel based on the lms algorithm has been proposed in order to improve the performance of the physical physical chain

scholarly journals Experimental demonstration of a cognitive quality of transmission estimator for optical communication systems

2012 ◽  
Vol 20 (26) ◽  
pp. B64 ◽  
Author(s):  
Antonio Caballero ◽  
Juan Carlos Aguado ◽  
Robert Borkowski ◽  
Silvia Saldaña ◽  
Tamara Jiménez ◽  
...  
Keyword(s):  
Optical Communication ◽  
Communication Systems ◽  
Experimental Demonstration ◽  
Optical Communication Systems ◽  
Quality Of Transmission ◽  
Cognitive Quality

scholarly journals Adaptive Beaconing in Mobility Aware Clustering Based MAC Protocol for Safety Message Dissemination in VANET

2017 ◽  
Vol 2017 ◽  
pp. 1-15 ◽  
Author(s):  
Nishu Gupta ◽  
Arun Prakash ◽  
Rajeev Tripathi
Keyword(s):  
Ad Hoc ◽  
Mac Protocol ◽  
Ieee 802.11P ◽  
Bandwidth Utilization ◽  
Transmission Frequency ◽  
Vehicle Communication ◽  
Safety Message ◽  
Vehicle To Vehicle ◽  
Wide Range

Majority of research contributions in wireless access in vehicular environment (WAVE)/IEEE 802.11p standard focus on life critical safety-related applications. These applications require regular status update of vehicle’s position referred to as beaconing. Periodic beaconing in vehicle to vehicle communication leads to severe network congestion in the communication channel. The condition worsens under high vehicular density where it impacts reliability and upper bound latency of safety messages. In this paper, WAVE compliant enhancement to the existing IEEE 802.11p protocol is presented which targets prioritized delivery of safety messages while simultaneously provisioning the dissemination of nonsafety messages. Proposed scheme relies on dynamic generation of beacons to mitigate channel congestion and inefficient bandwidth utilization by reducing transmission frequency of beacons. Through the use of clustering mechanism, different beaconing frequencies and different data transmission rates are assigned to prioritize vehicular mobility. Through extensive simulation results, the performance of the proposed approach is evaluated in terms of a wide range of quality of service (QoS) parameters for two different transmission ranges. Results show that the proposed protocol provides significant enhancement and stability of the clustered topology in vehicular ad hoc network over existing standard and other protocols with similar applications.

scholarly journals Performance evaluation of new blind OFDM signal recognition based on properties of the second-order statistics using universal software radio peripheral platform

2021 ◽  
Vol 23 (2) ◽  
pp. 1227
Author(s):  
Mohamed Firdaoussi ◽  
Hicham Ghennioui ◽  
Mohamed El Kamili ◽  
Mohamed Lamrini
Keyword(s):  
Performance Evaluation ◽  
Order Statistics ◽  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
Software Radio ◽  
Second Order ◽  
Modulation Recognition ◽  
Second Order Statistics ◽  
Ieee 802.22 ◽  
Universal Software Radio Peripheral

<div>In the context of cognitive radio (CR) or various military and civilian applications, modulation recognition (MR) is one of the most popular technical processes in the field of communication system recognition, by which the modulation type of the unknown received signal can be identified automatically by estimating one or more parameters of the modulated signal. This paper presents the performance evaluation of the new proposed blind system recognition method using only a particular property of the second-order statistics of the orthogonal frequency division multiplexing (OFDM) modulated signal. The effectiveness of the proposed method is illustrated using the implementation on universal software radio peripheral (USRP) platform. A comparison with computer simulations using MATLAB software is also performed, emphasizing the good performances of the method while the results obtained are close. We show the efficiency and behavior of the proposed method in the context of wireless communication systems based on OFDM modulation (3GPP/LTE, WiMAX, DVBT-2K, IEEE 802.22-1K,IEEE 802.22-2K, IEEE 802.22-4K). The proposed method can detect OF DM signals among other digital signals in a systematic and intelligent way even with low SNR values (when approaching to SNR=-2dB, the decision criteria tends towards 0).</div>

Digital Transformation and Cybersecurity Challenges

2021 ◽  
pp. 203-226
Author(s):  
Fatimah Al Obaidan ◽  
Saqib Saeed
Keyword(s):  
Machine Learning ◽  
Communication Systems ◽  
Human Life ◽  
Malware Detection ◽  
Digital Transformation ◽  
Machine Learning Techniques ◽  
Sensitive Information ◽  
Static And Dynamic Analysis ◽  
Learning Techniques

Digital transformation has revolutionized human life but also brought many cybersecurity challenges for users and enterprises. The major threats that affect computers and communication systems by damaging devices and stealing sensitive information are malicious attacks. Traditional anti-virus software fails to detect advanced kind of malware. Current research focuses on developing machine learning techniques for malware detection to respond in a timely manner. Many systems have been evolved and improved to distinguish the malware based on analysis behavior. The analysis behavior is considered a robust technique to detect, analyze, and classify malware, categorized into two models: a static and dynamic analysis. Both types of previous analysis have advantages and limitations. Therefore, the hybrid method combines the strength of static and dynamic analyses. This chapter conducted a systematic literature review (SLR) to summarize and analyze the quality of published studies in malware detection using machine learning techniques and hybrid analysis that range from 2016 to 2021.

scholarly journals FBMC + Security – A New Candidate for 5G

2020 ◽  
Vol 8 (5) ◽  
pp. 210-213
Keyword(s):  
Spectral Efficiency ◽  
Data Transmission ◽  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
Filter Banks ◽  
Human Life ◽  
Perfect Reconstruction ◽  
Multicarrier Communication ◽  
Secure Data ◽  
Secure Data Transmission

Recent researches and discussions stress the need for waveforms with better spectral efficiency which could be obtained by Orthogonal Frequency Division Multiplexing (OFDM). OFDM supports multicarrier communication and is capable of mitigating Inter Symbol Interference. Hence there is no need of equalizer at the receiving side. Human life has become easy and comfortable due to the rapid of wireless technology. At the same time there is an increase in the number of malicious users and the threat created by them for secure data transmission is noteworthy. Hence this work aims at to provide a solution which could solve the above discussed issues. Filter banks with multicarrier communication systems has gained popularity because of its capability to overcome the spectral leakage. Hence filter banks are placed instead of cyclic prefix. Near perfect reconstruction filter has been utilized to reduce the leakage. Further, Secure data transmission is accomplished by means of authentication tag. Pseudo Noise (PN) sequence named XOROSHIRO has been generated and appended with the information to be transmitted. At the receiving end only the information with authentication tag is accepted and the rest are omitted. FBMC system together with the authentication tag improves the spectral efficiency and also ensures safe and successful communication.

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