Abstract
Many researches in the world deal with driving on the road to ensure optimum safety. In this context, several telecommunication technologies are often used to connect the vehicles via continuous wireless communication with the infrastructure, exchange data and information relevant to increase overall road safety and enable cooperative traffic management. These systems are not reliable for all situations and the difficulties encountered by the drivers. We have been proposed the Multi-band Orthogonal Frequency- Division Multiplexing system based on Ultra Wide Band (MB-OFDM UWB) as a good candidate to insure a Vehicle to Infrastructure (V2I) communication with high data rate and good performances in terms of Bit Error Rate (BER). However, Inter-Carrier Interference (ICI) resulting from Doppler shift phenomenon degrades MB-OFDM UWB system performance and raises a significant challenge in wireless mobile environment. In this study, V2I communication based on the MB-OFDM UWB technology is studied and analyzed for 200 Mbit/s, over multipath channel using the IEEE802.15.4a channel model with Doppler shift for different speeds. The theoretical formulas of BER in Additive White Gaussian Noise (AWGN) and Rayleigh channels are calculated and are compared to the simulation results in MB-OFDM UWB system. The comparison shows that simulation results are consistent with theoretical formulas. The degradation in the performance of the proposed system solution becomes worse with a high speed 250 Km h1, so it's necessary to use new receiver solutions. The Extended Kalman Filer (EKF) and the Maximum Likelihood (ML) estimation with ZF equalizer have been proposed and have been compared to Zero-Forcing (ZF) in order to combat the ICI effect. For high value of speed (250 Km h1), the EKF method performs better than the ML method, better than the ZF equalizer and offers much improvement in performance in term of BER
Highlights
The poor estimation of the safety distance to be technologies are proposed to ensure the implementation of maintained between vehicles and poor visibility in fog or system driver assistance or receiving information and to heavy rain has generated a large number of accidents
We have been proposed the Multi-band Orthogonal FrequencyDivision Multiplexing system based on Ultra Wide Band (MB-OFDM UWB) as a good candidate to insure a Vehicle to Infrastructure (V2I) communication with high data rate and good performances in terms of Bit Error Rate (BER)
Comparing the simulation results of BER versus Eb/N0 for uncoded MB-OFDM system over Additive White Gaussian Noise (AWGN) channel, with the corresponding theoretical formula described in Equation (4), we find that the performance of the proposed system perfect agrees with the analytical performance
Summary
The poor estimation of the safety distance to be technologies are proposed to ensure the implementation of maintained between vehicles and poor visibility in fog or system driver assistance or receiving information and to heavy rain has generated a large number of accidents. Sanaa Kabil et al / Journal of Computer Science 9 (10): 1305-1317, 2013 transmit the vehicle's main features: its plot, its geometry, its level of adhesion and its peculiarities It will provide information on driving conditions related to climate (rain, wind, snow, sleet and fog) or related to traffic. The Federal Communication Commission (FCC) has recognized the importance of having a dedicated wireless spectrum for improving traffic safety and highway efficiency (Bai et al, 2012). They are not reliable for all situations and the difficulties encountered by the drivers. These frequency errors normally referred to as Carrier Frequency Offset (CFO) causes the loss of orthogonality between the subcarrier and signal transmitted on each carrier are not independent to each other, leading to the Inter-Carrier Interference (ICI), so that system performance may be considerably degraded
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