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High-speed railway communication implemented based on Long-Term Evolution-Railway (LTE-R) Platform has strict requirements for quality of services to support high data-rate transmission for numerous mobile users. In such environment, there often exists inter-carrier interference. In this paper, we exploit a robust channel estimation method in the time domain for very fast time-varying LTE-railway...
This study was aimed to confirm the effects of augmented reality (AR) information use on the cognitive reaction behavior of drivers with specific reckless driving propensity under reduced visibility traffic environment. Therefore, we conducted an experiment to collect the reaction time for preceding vehicles and pedestrians. And We collected the reckless driving propensity information of drivers using...
Driver status detection is an essential task because driver distraction, fatigue, and drowsiness of driver are serious causes of traffic accident in recent. In this paper, we focus on driver distraction and propose a method to detect driver distraction. We detect driver distraction using single Convolutional Neural Network model such as Inception ResNet and MobileNet. As our experiments, both models...
WAVE(Wireless Access in Vehicular Environments) communication technology has been designed for short initial link, low latency and high mobility in the communication between vehicles or between a vehicle and an infrastructure. In order to provide high quality and reliable services using WAVE technology, it is required to guarantee QoS(Quality of Service) in the WAVE. However, there are limitations...
Nowadays, a lot of safe driving devices and systems have already been commercialized and applied in many vehicles and it is necessary to test these safe driving devices and systems through the simulation at the laboratory first before the real vehicle and road test. This paper describes a driving situation criteria established for collection of driving and vehicle data and a data collection system...
WAVE is a main architecture for vehicular communication. A part of WAVE, 1609.4, describes multi-channel operations to support service data delivery. But it has fixed channel access interval that is not enough time to handle all generated packets in a congested vehicular density. The objective of this paper is to present a variable CCH interval for WAVE multi-channel access based on regional message...
Relay networks enhance the system performance by creating cooperative diversity gain and extend communication range by relaying the received signal to other devices. Recently, Long Term Evolution-Railway (LTE-R) is applied in railway communication to increase capacity by keeping reliability, and 3rd Generation Partnership Projects (3GPP) adopts relay function for data transmission. In this paper,...
A model of the queue operation in a cyclic bandwidth allocation time division multiple access (TDMA) system is proposed and formulas to estimate the queuing delay from the model are derived. In the queue modelling, a cyclic bandwidth allocation algorithm is used, which allocates the bandwidth periodically for multiple access control. From the simplified numerical analysis, one can estimate intuitively...
Vehicular communications provide new convergence applications by combining vehicles and communication technologies. In this paper, we consider the anti-collision warning application using vehicle-to-vehicle (V2V) communication. First, we introduce the general and special features of the overall system and specifications of the communication prototype. Then, we investigate the application scenarios...
In vehicular communications, the channel estimation is critical to compensate signal distortion due to wireless channel in high mobility scenario. To improve the error performance of vehicular communications, we proposed the midamble-based channel estimation scheme. Based on the proposed scheme, we investigate the effect of midamble insertion on the system performance. With various midamble insertion...
We introduce vehicle multi-hop communication (VMC) project in Korea, which provides vehicle to vehicle and vehicle to Infra communications. At first, technical issues such as high mobility, low packet latency and high density are discussed. And we propose Mid-amble based channel estimation and hybrid MAC for vehicle safety and traffic information applications. Mid-amble based channel estimation is...
In this paper, we present mid-amble aided channel estimation and its performance analysis of OFDM signal in high mobility vehicular radio channel. Preamble and pilot subcarriers are used for initial acquisition and channel estimation in WAVE system. In case of long sized packets, the performance is degraded in high mobility radio channel. The proposed mid-amble aided channel estimation gives the improved...
This paper presents an implement of a broadband clock phase alignment (CPA) for burst mode data recovery deployed in passive optical networks (PON) which are designed to deliver gigabit data rates to the home. A fast and robust CPA has been designed and demonstrated based on the over-sampling & tap-selection technique that the incoming preamble containing a repeated "1010" bit sequence...
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