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This paper focuses on the downlink system capacity in distributed antenna systems (DAS). Firstly, this paper establishes a composite channel model which takes path loss, lognormal shadowing and Rayleigh fading into consideration. Then, to facilitate the analysis, the distribution of the output SNR is approximated by a lognormal distribution. After that, by making use of selective diversity (SD) scheme...
The IEEE 802.11(p)/1609 network is a promising candidate for future vehicular communication networks. Due to the deployment cost consideration, roadside units (RSUs) in such networks are usually installed only at hot spots and intersections, causing the service coverage of RSUs to be discontinuous. To overcome this problem, multihop data forwarding among vehicles can be used to extend the service...
Aviation communication network is composed of various kinds of IP-enabled aerial mobile ad hoc network, IP-enabled ground network and aerial data link system that don't support IP protocol. Satellite data links would also be available in the future. Different types of networks and systems construct one hierarchical network structure, so single routing protocol or incompatible protocols couldn't be...
Road safety has become an important issue and gained much attention for many years. To avoid vehicle collisions on the roads, researchers have proposed various collision warning systems (CWS) using different technologies. Compared with CWS using other technologies, a radio-based CWS is more capable of avoiding collisions in off-sight scenarios (such as the four corners of an intersection). Most existing...
In 2003, Chien and Jan proposed an authentication scheme for hybrid networking environments. The scheme consisted of two subschemes; an intra-domain authentication subscheme, and an inter-domain authentication subscheme. In 2006, Qiang and Chris analyzed these two subschemes and found security vulnerability. However, they did not correct the security problem they found. In this paper, we propose a...
During vertical handoff, some undesirable phenomena may mistakenly trigger TCP congestion control operations and thus degrade TCP performance. In this paper, we propose an approach that can quickly estimate available bandwidth when a mobile node (MN) handoff occurs. A sender updates the adaptive slow-start threshold (ssthresh) and congestion window size (cwnd) to improve TCP performance during soft...
Intelligent transportation systems (ITS) is an important research topic. One goal of ITS is to exchange information among vehicles in a timely and efficient manner. In the ITS research community, inter-vehicle communications (IVC) is considered a way that could achieve this goal without infrastructure support. An information network built on top of vehicles using IVC is a type of mobile ad hoc networks...
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