Volume 7, Issue 1, February 2011

E-PON IPACT VHDL Implementation [Full Text]

A. Tonini, A. Mady and R. Alimur

Ethernet Passive Optical Networks (E-PON) are an effective solution for low cost FTTH access networks because of
their simplicity and high speed features. While scalability is still the main issue of E-PON next generation networks, as they allow the highest number of subscribers to share the same PON infrastructure, the E-PON Dynamic Bandwidth Assignement (DBA) schedulers for the Time Division Multiplexing (TDM) cover a key role for an efficient E-PON bandwidth allocation. For this purpose, we have implemented in VHDL code the Interleaved Polling Adaptive Control Time (IPACT) algorithm. Furthermore, to test the whole design, we developed a complete VHDL test bench in order to evaluate and optimize the scheduling algorithm. This test bench allowed us to consider the critical points of the scheduler and the optimization margins in a real hardware environment. The whole design is deployed over hardware E-PON devices using FPGA designs and considering the hardware area and time constraints.


Metamaterial Embedded Electrically Small Planar Loop Antenna
[Full Text]

J.G. Joshi, Shyam S. Pattnaik, S. Devi and M.R. Lohokare

This paper presents electrically small planar square loop antenna loaded with embedding metamaterial multiple split ring resonator (MSRR). The unloaded planar loop antenna resonates at 10 GHz and after loading with MSRR it resonates at 5.58 GHz. Acccoring to Chu limit, size of the proposed antenna is ka = 0.948<1 which satisfies the condition for electrically small antenna that is ka <1. The bandwidth and gain of this antenna is 303 MHz (-10dB) and 4.80 dBi respectively in the small size with the directivity of 7 dBi. The size of this antenna is 0.214
λ × 0.214 λ. The estimated radiation Q factor (Qrad) is 18.43 which is much larger than the Q minimum that is Qchu = 2.22.


Model for remote data acquisition and monitoring integrating social media, NTIC´s and 3G cell phone Networks applied to monitoring small wind turbine [Full Text]

Gruber V., Schaeffer L., Silva J.B. and Restivo T.

This article shows the development of a platform model that can monitor, acquire, store and transmit data remotely using sensors, 3G cell phone network and social media to be applied to the design of small wind turbine, aiming at generating a product which presents a good cost/effectiveness ratio, using management and manufacturing materials and processes adapted to world reality. A new model of a data acquisition system is presented based on the integration of the new information and communication technologies (NTIC´s), social media and analog and digital signal processing techniques, intending to study the performance of variables generated in the bench wind turbine. This system will allow continuous monitoring, at foreseen sampling intervals, of changes in the parameters analyzed through the sensors installed in the wind turbine. The results of the analysis of these sensors can be acquired and transmitted remotely through the 3G network, directly to an operations room, or also be made available on the Web through social media, supporting decision-making. The information studied here shows results useful to any market segment and to all scientific, economic and environmental areas which intend to develop and become acquainted with a small wind energy generation system. Although wind turbine variables were used in the experiment in the experiment, other possible applications for data acquisition and monitoring and remote experiments are shown, using the 3G cell phone communication channel and social media.