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Vehicular ad hoc networks (VANETs) rely on multi-hop communication in order to disseminate information to locations beyond the transmission range. In this paper, the use of handshaking mechanism is evaluated against instant transmission for safety message routing in VANETs for the first time. It is argued that due to the small size of VANET safety message (mean payload size of 100 bytes), handshaking...
This study provides a general framework for distributed multi-user power control problems in cognitive radio (CR) networks over fading channels. Using a non-cooperative game with coupled constraints in CR and primary channel outages, the fundamental performance traits of power control for multiple CR users are analyzed in the present of multiple primary users (PUs) in fading environments for the first...
The growing interest in vehicular ad hoc networks (VANETs) enables decentralized traveler information systems to become more feasible and effective in Intelligent Transportation Systems (ITS). Major challenges in such network environments include varying path characteristics and vulnerable channel quality resulting from dynamic traffic conditions and the design of the road. This paper demonstrates...
This paper studies the repeated power control game in cognitive radio (CR) networks through reinforcement learning without channel and power strategy information exchange among CR users. Unlike traditional game-theoretical approaches on CR power control, this research solves the incomplete information power control problems for selfish and autonomous CR users for the first time. Each CR user in the...
Cognitive radio ad hoc networks (CRAHNs) solve the problem of spectrum utilization when the licensed or primary user (PU) activity changes over time. This affects not only the spectrum availability, but also the network topology, making the analysis of scaling laws very challenging. Currently, the effect of PU activity on the network scaling laws has not been theoretically analyzed, to the best of...
To support the quality of service in wireless multimedia communications, wireless systems should work well in typical wireless environments characterized by the path loss of the signals, multipath fading, interference to adjacent channels, and random errors. A variety of researches in the application-layer have been proposed to adapt the video encoder to the link quality by compressing the data with...
Various vehicular communication technologies have been proposed to provide reliable and seamless wireless communications. Short-range vehicular communications can be established using IEEE 802.11p, and the range of these protocols can be extended using mobile multi-hop ad hoc networks. To provide consistent quality of service (QoS) with maximum achievable transmission rate, many algorithms assume...
A relay station (RS) in IEEE 802.16j mobile multi-hop relay (MMR) networks provides access links to far-off subscriber stations (SSs) and hidden subscriber stations. The RS also relays data from a base station and other RSs while maintaining backward compatibility with legacy subscriber stations in existing IEEE 802.16 networks. Much research is being performed to finalize the standard; however, how...
Worldwide interoperability for microwave access (WiMAX), designed by the IEEE 802.16 standards group, can deliver high-speed connectivity for both fixed and vehicular speed subscribers. Mesh networking support was added for improved coverage and throughput. In order to operate efficiently, communication must be scheduled either by a distributed, centralized, or hybrid algorithm. However, in the current...
Packet based wireless networks have provided high data rates, and the desire for ubiquitous wireless computing is growing rapidly. To accommodate these demands, wireless systems should work well in typical wireless environments. The most widely deployed WLAN technology, IEEE 802.11, uses the unlicensed ISM band, which is vulnerable to noise generated by electronic devices. This paper proposes a way...
To meet the demand for broadband wireless communication, wireless systems should work well in typical wireless environments, characterized by the path loss of the signals, multipath fading, interference to adjacent channels, and random errors. IEEE 802.11 VVLANs use the unlicensed 2.4 GHz industrial, scientific and medical (ISM) band, which is vulnerable to noise generated by TVs, microwaves, and...
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