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The primary aim of a Cognitive Radio Network (CRN) is to provide higher spectrum utilization through an opportunistic usage of the licensed spectrum bands by the unlicensed Secondary Users (SUs). However, these SUs face unpredictable interruptions in their transmissions due to sudden arrival of the licensed Primary Users (PUs), resulting in either handoff or dropping instances. The channel reservation...
Cognitive Radio Network (CRN) aims to solve the problem of spectrum congestion by allowing opportunistic use of idle spectrum bands by secondary users (SUs) in the absence of primary users (PUs). Channel reservation policies have been proposed in this regard to ensure maximum throughput for these SUs, while minimizing their interference with PUs. However, these algorithms always reserve a fixed number...
Cognitive Radio Network (CRN) ensures higher utilization of spectrum by allowing secondary users to transmit in licensed frequency bands in absence of primary users. In order to reduce interference among these users, CRN imposes a maximum limit on total number of users that can be admitted in CRN. The overall user capacity is further increased by implementing VoIP based 2-tier CRN that allows another...
Real-time VoIP communication demands strong QoS assurance for its efficient performance. Ensuring high quality of VoIP transmission in spectrally congested scenarios requires deployment of VoIP applications in intelligent Cognitive Radio Networks (CRN) that aim to increase spectrum utilization through its opportunistic mode of communication. However, complexities inherent in unmodified CRN make it...
VoIP over Wireless LANs is greatly affected by pathloss, RF interference and other sources of signal attenuation in addition to network congestion. The primary factors involved in effective real-time communication, namely delay and loss, must be within certain controlled limits in such a scenario. Wireless LAN Access Points must, therefore, act in tune with the codecs to ensure high quality of the...
VoIP service demands strong QoS support for enhanced call quality and increased user satisfaction. Deploying VoIP in opportunistic communication models like cognitive radio requires thorough analysis of the factors involved in design and implementation. The objective of this paper is to implement VoIP successfully over a cognitive radio network and maintain the call quality at an acceptable limit...
The performance of wireless LANs is greatly affected by path loss, RF interference and other sources of signal attenuation in addition to network congestion. The primary factors involved in effective real-time communication, namely delay and loss, must be within certain controlled limits in such a scenario. In this paper, we analyze the various factors driving IEEE 802.11b access points through extensive...
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