23-07-2014, 02:47 PM
GI-FI-THE NEXT GENERATION WIRELESS TECHNOLOGY.
GI-FI-THE NEXT GENERATION.docx (Size: 425.79 KB / Downloads: 19)
Abstract
Gi-Fi will helps to push wireless communications to faster drive. For many years cables ruled the world. Optical fibers played a dominant role for its higher bit rates and faster transmission. But the installation of cables caused a greater difficulty and thus led to wireless access. The man’s continuous quest for even better technology despite the substantial advantages of present technologies led to the introduction of new, more up-to-date standards for data exchange rate i.e., Gi-Fi. It utilizes a 5mm square chipand a 1mm wide antenna burning less than 2 watts of power to transmit data wirelessly over short distance, much like Bluetooth.The breakthrough will mean the networking of offices and home equipment without wires will finally become a reality. In this report we present alow cost, low power and high broadband chip, which will be vital in enabling the digital economy of the future.
INTRODUCTION
Gi-Fi or gigabit wireless refers to wireless communication at a data rate of more than one billion bits (gigabit) per second.Gi-Fi or Gigabit Wireless is the world's first transceiver integrated on a single chip that operates at 60GHz on the CMOS process.It allows wireless transfer of audio and video data up to 5 gigabits per second within a range of 10 meters. It was developed by the Melbourne Universitybased laboratories of NICTA (National ICT Australia Limited), Australia’s Information and Communications Technology Research Centre of Excellence.
Melbourne University researchers have achieved up to 5Gbps data transfer rates on a wireless chip.This is a lot faster than any current Wi-Fi speeds
WHY GI-FI ?
The reason for pushing into Gi-Fi technology is because of slow rate, high power consumption, low range of frequency operations of earlier technologies i.e. Bluetooth and Wi-Fi.The above comparision shows disadvantages of Bluetooth and Wi-Fi.
WORKING IN GI-FI
Here we will be use a time division duplex for both transmission and receiving. The data files are up converted from IF range to RF 60Ghz range by using 2 mixers. We will feed this to a power amplifier, which feeds millimetre-wave antenna. The incoming RF signal is first down converted to an IF signal centered at 5 GHz .and then to normal data ranges, here we will use heterodyne construction for this process to avoid leakages due to direct conversion. Due to availability of 7 GHz spectrum the total data will be transferred within seconds.
Time Division Duplex
Time Division Duplex (TDD) is the application of time-division multiplexing to separate outward and return signals. It emulates full duplex communication over a half duplex communication link. Time division duplex has a strong advantage in the case where the asymmetry of the uplink and downlink data speed is variable. As uplink traffic increases, more channel capacity can dynamically be allocated to that, and as it shrinks it can be taken away. Another advantage is that the uplink and downlinkradio
Low Power Consumption
As thelarge amount of information transfer, it utilizes mili-watts of power only. It consumes only 2 watt power for data transfer of gigabits of information, where as in present technologies it takes 2watt power, which is very high
Quick Deployment
Compared with the deployment of wired solutions, WiMAX requires little or no external plant construction. For example, excavation to support the trenching of cables is not required. Operators that have obtained licenses to use one of the licensed bands, or that plan to use one of the unlicensed bands; do not need to submit further applications to the Government. Once the antenna and equipment are installed and powered, Gi-Fi is ready for service. In most cases, deployment of Gi- Fi can be completed in a matter of minutes, compared with hours for other solutions
CONCLUSION
Within five years, we expect Gi-Fi to be the dominant technology for wireless networking. By that time it will be fully mobile, as well as providing low-cost, high broadband access, with very high speed large files swapped within seconds which will develop wireless home and office of future.Two important characteristics of CMOS devices that is used in this technology is are high noise immunity and low static power consumption.