GIFI TECHNOLOGY

Purnima Sai

Lead Front-End Developer

Gi-Fi stands for Gigabit Wireless. It is ten times the current maximum wireless transfer rate usually within a range of 10 meters. It is the world’s first transceiver integrated on a single chip that operates at 60 GHz using CMOS (Complementary Metal Oxide Semiconductor) technology. It will allow wireless transfer of audio and video up to 5gb/s. It utilizes a 5mm square chip and a 1 mm wide antenna burning less than 2 milliwatts of power to transmit data wirelessly over short distances, much like Bluetooth. Gi-Fi technology provides many features such as ease of deployment, small form factor, enabling the future of information management, high speed of data transfer, low power consumption etc.
Why Gi-Fi?   
The reason for pushing into GIFI technology is because of low rate, high power consumption, low range of frequency operations of earlier technologies i.e. Bluetooth and WI-FI. See the comparisons and features of those three technologies.

CharacteristicsBluetoothWi-Fi

Frequency

2.4GHz

2.4GHz

Range

10 meters


100 meters

Primary Application

WPAN: cable replacement


WLAN: Ethernet

Data transfer rate

800kbps

11Mbps

Power consumption

LowMedium

Primary devices

Mobile Phones, PADs,
consumer electronics,
office and industrial
automation devices

Servers

Primary user

Travelling employees, electronics consumer, office and industrial workers

Corporate campus users

Disadvantages of Bluetooth & Wi-Fi: 

1. From the table we can conclude that the bit rate of Bluetooth is 800 Kbps and Wi-Fi has 11Mbps.
2. Both are having power consumptions 5mw and 10mw.
3. They have lower frequency of operation 2.4GHz.
4. For transferring large amount of videos, audios, data files take hours of time.So to have higher data transfer rate at lower power consumption we move onto GiFi Technology.

Architecture of Gi-Fi:
1. The core components of a Gi-Fi system is the subscriber station which available to several access points.

2. It supports standard of IEEE 802.15.3C supports millimeter-wave wireless pan network used for communication among computer devices (including telephones and personal digital assistants) close to one person.

3. An 802.15.3C based system often uses small antenna at the subscriber station. The antenna is mounted on the roof. It supports line of sight operation.

Fundamental Technologies in 802.15.3C
This millimeter-Wave WPAN will operate in the new and clear band including 57-64 GHz unlicensed band defined by FCC 47 CFR 15.255. The millimeter-wave WPAN will allow high coexistence (close physical spacing) with all other microwave systems in the 802.15 family of WPANs.

Working in Gi-Fi
Here we will be use a time division duplex for both transmission and receiving. The data files are  converted from IF range to RF 60 Ghz range by using 2 mixers. We will feed this to a power amplifier, which feeds millimeter-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. For Radio systems that aren't moving quickly, another advantage is that the uplink and downlink radio.

Why 60 GHz?
Here we will use millimeter wave antenna which will operate at 60 GHz frequency which is unlined band .Because of this band we are achieving high data rates energy propagation In the 60 GHz band has unique characteristics that make possible many other benefits such as excellent immunity to co-channel interference, high security, and frequency reuse.

Point-to-point wireless systems operating at 60 GHz have been used for many years for satellite-to-satellite communications. This is because of high oxygen absorption at 60 GHz (10-155. 5dB/Km). This absorption attenuates 60 GHz signals over distance, so that signals cannot travel far beyond their intended recipient. For this reason, 60GHz is an excellent choice for covert communications.

ULTRA WIDE BAND FREQUENCY USAGE

UWB, is a technology with high bit rate, high security and faster data transmission. It is a zero carrier technique with low coverage area. So we have low power consumption. These features are Ultra-Wideband (UWB) is a technology for transmitting information spread over a large bandwidth (>500 MHz) that should, be able to share spectrum with other users. Regulatory Settings of FCC are intended to provide an efficient use of scarce radio bandwidth while enabling both high data rate personal-area network (PAN) wireless connectivity and longer-range, low data rate applications as well as radar and imaging systems.

FEATURES OF GI-FI:

1. High speed of data transfer

2. Low power consumption

3. High security

4. Cost effective

5. Small size

6. Quick deployment

7. Highly portable

8. High mobility  

APPLICATIONS OF GIFI:

1. Household appliances : It makes the wireless home and office of the future.

2. Office appliances : As it transfers data at high speeds that made work very easy.  

3. Video information transfer :  We can transfer at a speed of gbps.

4. Inter-vehicle communication system:

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.If the success of Wi-Fi and the imminent wide usage of Wimax is any indication, Gi-Fi potentially can bring wireless broadband to the enterprise in an entirely new way.