Access to reliable estimates of the wireless channel, such as channel state information (CSI) and received signal strength would open opportunities for timely adaptation transmission parameters consequently increased throughput efficiency in vehicular communications. To design adaptive schemes, it is important understand realistic properties, especially environments where mobility communication devices causes rapid variation. However, getting CSI challenging due lack support obtaining from...

Ensuring cooperative awareness by periodic message beaconing in vehicular environments is necessary to address pedestrian safety. However, high basic safety broadcasting dense makes accessing the communication channel very competitive. Furthermore, high-frequency causes fast device energy dissipation which a key issue for small computing devices used wireless sensor and mobile communications. Therefore, order achieve reliable dissemination vehicle-to-pedestrian safety, loss minimization...

The importance of an accurate path loss model vehicular environments is critical for the communication system design. However, estimating in difficult due to high dynamics and low antenna heights. In this paper, we propose a line-of-sight (LOS) vehicle-to-vehicle (V2V) scenarios provide deep analysis shadow fading urban non-LOS (NLOS) by deductive method with proposed LOS model. results can be utilized as reference material further V2V measurements.

The Fresnel zone is often utilized for the determination of existence line-of-sight (LOS) in wireless communication links. In this paper, first clearance analyzed especially focused on vehicle-to-vehicle (V2V) scenarios. results reveal that clear links with transmitter and receiver separation distances exceeding 500 m are regarded as non-LOS (NLOS)

This paper proposes two max-pooling engines, named the RTB-MAXP engine and CMB-MAXP engine, with a scalable window size parameter for FPGA-based convolutional neural network (CNN) implementation. The operation CNN can be decomposed into stages, i.e., horizontal axis vertical operation. These one-dimensional operations are performed by tracking rank of values within in cascading maximum engine. Both were implemented using VHSIC hardware description language (VHDL) verified simulations....

IEEE 802.11p-based wireless access in vehicular environments (WAVE) multi-channel communication introduces clusters which limits on the dissemination efficiency of broadcast applications such as safety messaging. This paper proposes cooperative information (CMD) follows a channel coordination approach where coordinator is selected based least average distance (LAD) to all service channels with goal relaying emergency message other minimum delay. On receipt high priority messages, each...

The IEEE 1609.4 legacy standard for multichannel communications in vehicular ad hoc networks (VANETs), specifies that the control channel (CCH) is dedicated to broadcast safety messages, while service channels (SCHs) are transmit infotainment content. However, SCHs can be used as an alternative high priority messages event they invoked during interval (SCHI). This implies there a need across multiple available utilized ensure all vehicles receive message. Transmission using requires...

Vehicular networks are expected to contribute improving transportation systems, especially reducing traffic accidents. However, the impact of vehicular may not be easy intuitionally realize because it is difficult express in numerical value. To address this issue, we analyze effectiveness latency form using concept reaction distance paper. Furthermore, compare performance with regard types communications.

차량 애드혹 네트워크에서 비콘 전송은 가장 기본적인 메커니즘 중 하나이다. 통신 시스템에서는 각 노드들의 교환을 통하여 주변 상황 인지를 비롯한 다양한 서비스가 구현된다. 본 논문에서는 기존의 단일 전송 방식에서 벗어난 이중 방식을 제안한다. 방식은 일반적으로 시스템에서 고려되는 비콘을 시스템에 특화시켜 안전 서비스를 위한 비콘과 편의 두 가지 기능으로 나누어 기능에 따라 파라미터를 분산시켜 적용하는 방식이다. 이러한 메커니즘의 성능을 평가하기 위하여 대표적인 성능 지표인 거리에 따른 패킷 수신율을 실험, 제안하는 방식의 우수함을 검증하였다. 결론적으로 방식에 비하여 채널에 부하를 줄임과 동시에 더욱 넓은 반경과 원활한 인지 가능하게 한다. 덧붙여, 실제로 구현함에 있어서 복잡성이 적고, 다른 적응형 함께 적용 가능하기 때문에 효용성이 뛰어나다. Beacon transmission is one of the fundamental mechanisms in vehicular ad...

Vehicular environments are highly unpredictable and fragile. Therefore traditional layered communication system architecture has limitations to provide robust environments. This paper proposes a physical (PHY) medium access control (MAC) cross-layer design in vehicular ad-hoc networks (VANETs) enhance overall performance of communications. Major parameters for both PHY MAC layers suggested VANETs optimize the according Significant improvements can be obtained with proposed parameters.

차량 통신 시스템을 이용한 서비스 설계를 위해서는 전파 특성에 대한 이해가 필수적이다. 그러나 통신환경은 낮은 안테나 높이와 높은 이동성으로 인하여 송수신기 사이의 채널 환경이 급변하므로 특성을 예측하기가 매우 어렵다. 이에 따라 기존에 채널을 모델링하고자 하는 연구들이 진행되어왔지만 통신환경이 워낙 다양하여 범용성이 떨어지고 특히 신호 레벨에서의 분석이 대다수를 이루다보니 시스템 레벨의 차량통신 성능을 알기 힘든 한계점이 있었다. 따라서 본 논문에서는 WAVE 표준 기반의 상용 이용하여 V2V(Vehicle-to-vehicle) 시나리오에서 발생할 수 있는 다양한 환경에 특성 분석을 진행하였다. 논문에서 실측한 데이터 통하여 전반적인 시스템의 송수신 성능과 더불어 주행-정지 상태 교차, 차량에 의한 NLOS(Non-Line-of-Sight), 터널 주행 등 특정한 시나리오에서도 확인하였다.

In this paper, we propose a scheduling algorithm for emergency message dissemination (SAEMD) in vehicular ad hoc networks. The SAEMD mainly aims to minimize the delay of delivery vehicles priority distances apart. Additionally, investigate that can reduce procedure, and verify with mathematical analysis it shows smallest closest vehicle among other schemes.

Broadcasting in vehicular ad hoc networks (VANETs) is the ideal communication technique for information dissemination and conventionally defined IEEE 802.11pbased wireless access environments (WAVE). Vehicular systems present a unique characteristic of dynamic positions varying vehicle density due to motion which challenge systems. Since node critical performance parameter broadcast communications, there need offer media control (MAC) solutions storm problem exists high domains. This paper...

In the IEEE 1609.4 legacy standard for multi-channel communications in vehicular ad hoc networks(VANETs), control channel (CCH) is dedicated to broadcast safety messages while service channels (SCH's) are transmit infotainment content. However, SCH can be used as an alternative high priority event that they invoked during interval (SCHI). This implies there a need across multiple available utilized ensure all vehicles receive message. Transmission SCH's using requires switching and therefore...