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In cognitive radio systems, Dynamic Spectrum Leasing (DSL) can improve the efficiency of spectrum utilization. In DSL, the primary user who has the license for a part of the bandwidth, decides to lease it to a secondary user or not. In this paper, we assume an OFDM-based system and perform the leasing operation in this system where the primary user leases the spectrum for a number of OFDM symbols...
This paper studies the joint OFDMA resource allocation and QoS routing problem in a hybrid wireless network, which includes an OFDMA based cellular network and an ad-hoc network with many sensor nodes. In such application, each sensor node generates certain amount of data that need to be sent to cellular base station (BS). The cellular nodes act as gateway to forward all the uplink traffic. We formulate...
It is unrealistic to assume that all nodes in an ad hoc wireless network would be willing to participate in cooperative communication, especially if their desired Quality-of-Service (QoS) is achievable via direct transmission. An incentive-based auction mechanism is presented to induce cooperative behavior in wireless networks with emphasis on users with asymmetrical channel fading conditions. A single-object...
The following topics are dealt with: cognitive radio; future internet research; service management; networking; source coding; network service; cooperative communication; wireless ad hoc networks; mesh networks; cryptography; ethernet; passive optical networks; MIMO systems; OFDM; OFDMA; elasticity; LDPC coding; wireless sensor networks; quality of service; random access; protocols; optical networks;...
Wireless Mesh Networks based on OFDMA and the Node-Disjoint Multipath Routing Protocol (NDMR) can provide practical high-speed broadband and robust transmission. In this paper, NDMR, a practical protocol in WMN is studied. it reduces routing overhead and achieves multiple node-disjoint routing paths. Also, the OFDMA based WMN and its subcarrier allocation problem is investigated. A novel QoS guaranteed...
The following topics are dealt with: performance modelling; performance evaluation; routing mechanisms; broadcast mechanisms; distributed systems; parallel systems; service oriented architecture; trust management; agent computing; video communication technology; communication protocol; automatic network systems; advanced network systems; Internet computing; ad hoc networks; wireless sensor networks;...
The following topics are dealt with: OFDM/MIMO; multimedia networking and broadband access; traffic modeling and analysis; network design and localization; radio resource management and QoS provisioning; wireless networks; ad hoc networks; hardware design and coding; network security and cognitive radios; sensor networks.
As wireless systems continue to proliferate, interference management is becoming a concern in both military and commercial domains. This paper introduces a novel cognitive coexistence framework between infrastructure and ad hoc networks. Based on sensing and predicting the ad-hoc networkpsilas activity, the infrastructure system allocates power and transmission time such as to minimize its impact...
The following topics were dealt with: wireless sensor networks; MANET; WLAN; IEEE 802.11; MIMO; OFDMA; scheduling; mobility and resource management; Internet; localization; WiMax; coding; OFDM; media streaming; QoS; security; WiMob; cryptographic protocols; ad hoc networks security; broadband wireless access; wireless and mobile computing.
The following topics are discussed: wireless communication systems; coding; decoding; wireless sensor networks; MIMO; OFDM; quality of service; location-based services; radio positioning; modulation; equalization; WiMAX; ad hoc networks; MAC; cross-layer design; power aware design; antennas; body area networks; cooperative networks; CDMA; VoIP; and fading channels.
The following topics are dealt with: VLSI; OFDM; embedded systems; filters; MIMO; cellular and integrated systems; media processing; Internet; image processing; network routing; QoS and resource allocation; network management; channel modelling and equalization; ad hoc networks; communication signal processing; WSN; channel estimation; WLAN and WWAN; coding and detection; security; UWB; cognitive...
The following topics are dealt with: communications QoS, reliability and performance modelling; wireless mesh, ad hoc and cellular networks; network routing; network congestion control; QoS control in mobile networks; wireless local area networks; network recovery and protection; network resource management; network traffic engineering; QoS techniques for video and voice; LDPC codes; cooperative networks;...
The following topics were dealt with: advanced communication technology; multimedia wireless LAN; software radio; OFDMA; IEEE 802.16e systems; IEEE 802.11e QoS stations; channel estimation; OFDM; wireless ubiquitous networks; ad hoc networks; automatic Web services; information gathering protocol; mobile communications; RFID; ALOHA; IEEE 802.11n; VisuGATOR; proxy signature scheme; single carrier modulation...
The following topics were dealt with: advanced communication technology; multimedia wireless LAN; software radio; OFDMA; IEEE 802.16e systems; IEEE 802.11e QoS stations; channel estimation; OFDM; wireless ubiquitous networks; ad hoc networks; automatic Web services; information gathering protocol; mobile communications; RFID; ALOHA; IEEE 802.11n; VisuGATOR; proxy signature scheme; single carrier modulation...
The following topics were dealt with: transmission technologies; radio resource management; propagation and measurements; sensor networks; mobile networks; channel estimation and modelling; MIMO; ad-hoc networks; antenna systems; mobile and wireless access; intervehicle communications; cellular systems; wireless systems; OFDM; broadcasting; UWB communication; space time coding and diversity systems;...
We investigate the problem of minimizing total transmit power in an ad hoc network while maintaining quality of service for each link in the network. It is assumed that each node in the network uses M transmit and M receive antennas. We introduce two new algorithms based on minimizing the total interference function (TIF). A cooperative algorithm is also introduced as a benchmark for other algorithms...
The following topics were dealt with: personal communications; indoor communications; mobile radio communications; MIMO communications; wireless MAN IEEE 802.16; QoS; radio resource management in beyond 3G systems; convergence of mobile and broadcast; UWB; cognitive networks; sensor networks; ad hoc networks; wireless cellular networks; interference avoidance; antennas; 4G systems; OFDM; MC-CDMA;...
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