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Zeta converters are the fourth-order DC-DC converters capable of operating in both step-up and step-down modes and do not suffer from the polarity reversal problem. There are many applications which require a variable output voltage commanded by an external reference signal. So, the Zeta converters can be particularly useful for such applications. To achieve a Zeta converter with adjustable output...
We investigate WiMAX mesh networks in terms of delay and throughput trade-off. For a given topology, using our proposed analytical model we study how slot allocation policy and forwarding probability affects per-node and network performance.
In this paper we propose a novel totally WiMAX-based architecture for large scale wireless broadband access. To provision scalable QoS, nodes' traffic should be managed locally. This is achieved through adding some gateway nodes which consequently leads to some cost. In order to realize the proposed architecture, intelligent node placement is primordial such the both cost and performance requirements...
Scalability, decentralized processing time and power and also eliminating the single point of failure are some of the benefits of using peer to peer systems for management purposes. There has been little effort on formulating or evaluating different important factors of network management in P2P management networks. As an important factor wepsilave focused on availability in network management systems...
This paper focuses on Iran next generation network (NGN) Pilot, the purpose of which is to achieve appropriate knowledge for a desired move through current telecommunication network of Iran to NGN. On the base of this purpose, obtaining a proper knowledge about capabilities and weaknesses of vendors' NGN equipments is necessary as well as verifying the functionalities of these equipments in a multi-vendor...
In distributed speech recognition, speech features are transmitted inside packets from a channel to speech recognition server. Some problems such as channel noise, packet loss and delay decrease distributed speech recognition rate. Several methods including packet-loss recovery approaches have been proposed to overcome to this decrease in recognition rate. Most of packet-loss recovery methods, don't...
In some telephony headsets the microphone is not close enough to the speaker's mouth due to size limitation. Thus the microphone captures background noise in addition to useful speech. There is a need to enhance the received signal in order to improve the voice quality in these systems. Among various enhancement methods, dual microphone methods are important for their low cost implementation and use...
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