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This paper presents a MAC layer protocol, called RTMAC, for real-time data streaming in wireless sensor networks. RT-MAC eliminates need to contend for a wireless medium by potential transmitting nodes in a range by introducing feedback control packet, called Clear Channel (CC). RT-MAC maximizes spatial channel reuse by avoiding false blocking problem of RTS/CTS exchange based wireless MAC protocols...
This paper presents a comparative study of existing real-time MAC layer protocols for wireless sensor networks. Then, a new real-Time MAC protocol is presented that is based on a general purpose MAC protocol, called S-MAC. While medium access strategy in S-MAC is based on contention and back-off schemes, protocol proposed in this paper uses feedback approach as a medium access strategy. As a result...
Implementing the Internet protocol in highly mobile networks has been an ongoing challenge in wireless communications. Through the evolution of mobile networks, this challenge has been addressed in several ways. One of the solutions is IP tunneling and encapsulation. This paper explores the development of encapsulation and IP mobility schemes, and then proposes a system for mobile, multi-hop WiMAX...
The current era of mobile communication is passing through the days of rapidly changing technologies. A technology which holds promise to bring surprise to the future users is ad hoc networks. The multiple access procedure in ad hoc networks is not error prone till now, although significant researches are going on in its MAC layer. The communications in ad hoc networks are adversely affected by the...
Current OFDM based wireless LAN systems assume relative static channel response over the entire packet burst length. This paper proposes applying adaptive filtering concepts to channel estimation of current standardized OFDM systems in order to track the rapidly fluctuating channel response of wireless access vehicular environments (WAVE) for 5.9 GHz dedicated short range communications (DSRC). Different...
A channel estimation scheme for the design of a 5.9 GHz dedicated short-range communications receiver for the purpose of vehicle-to-vehicle and vehicle-to-roadside communications is proposed. The receiver is based on the popular wireless local area network standard IEEE 802.11a, but with extended symbol duration. On the basis of analyses and simulations, the proposed receiver has superior design characteristics...
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