Volume, Issue 6, November 2011

C-Band Negative Resistance Bandpass filter with HEMT Technology [Download Paper]

Seyed Reza Hadian Amrei, Masoud Sabaghi, Zahra Mobini Seraji,Maryam Harirchi khorasani and Maziyar Niyakan Lahiji


Abstract—In this paper, we especially analyze in detail the active capacitance circuit and its Negative resistance characte-ristic. We used ADS2009 to perform simulations. Through the simulated results, it is shown that the proposed RF active filter can be applicable to the narrow bandpass filter (BPF) design, which also is stable and possesses Low-noise characteristics. The frequency range in which the circuit has negative resistance is 3-8GHz. And center frequency is 5.5GHz. We have 1.2dB gain at the center frequency and quality factor (Q) is 32. The noise-figure of active filter is 1.7dB at the center frequency. In gen-eral, the K factor is larger than unity and the circuit absolutely stable at the frequency range.

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Performance Evaluation of IEEE 802.11p for Vehicular Traffic Congestion Control [Download Paper]

Smitha Shekar B, G Narendra Kumar, Aparajitha Murali, Bhanupriya K


Abstract— Vehicular traffic congestion in metropolitan cities during disaster is a challenge which presents dire consequences for transporting VIPs, life saving drugs, patients, accident victims in need of immediate medical assistance etc. With better navigation system and real-time traffic congestion updates, the vehicles can overcome delays. Vehicular Ad Hoc Network (VANETs), transmits the real time congestion information to the vehicles from a centralized database to avoid unexpected congestion and follow the shortest path to the destination. In this paper a proposed prototype which can be modified to work for the requirement with different models, such as general traffic prediction and re-routing during emergencies in case of fire, accidents etc. along the route is worked out. IEEE 802.11p which has been introduced exclusively for vehicular environments has been implemented at the Physical and Medium Access Control (MAC) layers of the WAVE protocol stack which was considered for a metropolitan city over an unpredictable high density of vehicles. Evaluation of the performance of IEEE 802.11p, Wireless Access for Vehicular Environment (WAVE) communication standard against IEEE802.11a for the vehicular environment for multiple scenarios has been simulated and the results are encouraging.

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Design and Simulation a 1.9 GHz Class-E Power Amplifier [Download Paper]

Seyed Reza Hadian Amrei, Masoud Sabaghi,Monireh Sadat Miri, Zahra Mobini Seraji and Mehdi
Rahnama


Abstract—In this paper Class E amplifier was designed using Motorola’s LDMOS (Laterally Diffused Metal Oxide Semiconductor) transistor
models and its performance was simulated using ADS. A Class E power amplifier design that meets the CDMA specifications is described
in this paper. Various procedures involved in the design of the Class E amplifier such as DC simulation, bias point selection, sourcepull
and load-pull characterization, input and output matching circuit design and the design of suitable harmonic traps are explained. The final
amplifier implemented was a device operating at 1.9 GHz. In general the amplifier achieved its intended design specifications producing 220
mW with a power added efficiency of 58%.

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Survey of Tasks and Application Areas of Web Usage Mining [Download Paper]

A.Nirali Honest, B.Dharmendra Patel, C.Atul Patel


Abstract-The World Wide Web (WWW) provides a simple yet effective media for users to search, browse, and retrieve information in the Web. Application of Data Mining Techniques to the World Wide Web is referred to as Web Mining. Web mining can be classified into three ways (i) Web Structure Mining (ii) Web Content Mining and (iii) Web Usage Mining. Web Usage Mining aims to discover interesting patterns generated by user’s interaction on web usage data. Web usage mining has increased interest from both research and business communities. This paper presents the survey of tasks of web usage mining and describes each task in detail.