Saturday, December 20, 2014
Search
  
Submit your own News for
inclusion in our Site.
Click here...
Breaking News
T-Mobile to Pay $90 Million To Settle Case With FCC
New Trojan Targetted Banks Wordlwide
FBI Confirms North Korea Was Behind Sony Hack
Apple Responds To BBC's Allegations Over Working Conditions In Chinese Factory
BlackBerry Returns To Cash Flow
Comparison: Quantum Dot Vs. OLED Displays
Toshiba and SK Hynix Reach Settlement in Lawsuit Ahead Of CES
Google Concerned About MPAA's Actions To Revive SOPA
Active Discussions
Digital Audio Extraction and Plextools
Will there be any trade in scheme for the coming PSP Go?
Hello, Glad to be Aboard!!!
Best optical drive for ripping CD's? My LG 4163B is mediocre.
Hi All!
cdrw trouble
CDR for car Sat Nav
DVD/DL for Optiarc 7191S at 8X
 Home > News > General Computing > NICT, H...
Last 7 Days News : SU MO TU WE TH FR SA All News

Thursday, January 23, 2014
NICT, Hitachi Kokusai Electric Achieve Long-range Broadband Communication Using The White Space


The National Institute of Information and Communications Technology (NICT) and Hitachi Kokusai recently succeeded in the first field trial in which long-range broadband communications in the TV white space was confirmed by using IEEE 802.22-based and IEEE 802.11af-based systems.

In the trial, NICT and Hitachi Kokusai observed successful downstream and upstream data transmission at 12.7 km distance between IEEE 802.22-based base station and customer premises equipment, at speeds of 5.2 Mbps and 4.5Mbps, respectively.

In addition, NICT and Hitachi Kokusai constructed a multihop network by using IEEE 802.22 as a backbone link and IEEE 802.11af, which is connected to it, to expand its connection area. Wireless LAN, based on conventional IEEE 802.11b/g/n in 2.4 GHz band, was attached to IEEE 802.11af station through which conventional off-the-shelf devices were connected to the Internet. Using the devices, NICT and Hitachi Kokusai demonstrated availability of web access and conversation via video telephone.

An original function has been also developed based on IEEE 802.22 to operate in multiple channels. With two discontinuous TV channels to operate at the same time, they have succeeded in achieving throughput of 15.5 Mbps in downstream and 9.0 Mbps in upstream over 6.3 km.

Demand for broadband communication services in mountainous areas and remote islands have been problematic. To provide the services, a wireless system is required as a cost effective service comparing to wired networking. White space in TV band (470-710 MHz, in Japan) is expected for long-range communication whereas a legacy system using higher frequency such as wireless LAN and cellular systems cover shorter range, since lower frequency has generally low impact on distance decay toward obstacles.

The Japanese scientists demonstrated some applications such as video monitoring of roads and cliffs and video telephone in a mountainous area where there is no wired Internet connection available or broadband wireless Internet connection.

These achievements show feasibility of broadband services in rural areas and supporting communications in case of disasters.




Previous
Next
LG Display Reports Low 4Q Profit As Panel Prices Weaken        All News        Samsung And Apple Remained Top Global Semiconductor Buyers in 2013
LG Display Reports Low 4Q Profit As Panel Prices Weaken     General Computing News      Samsung And Apple Remained Top Global Semiconductor Buyers in 2013

Get RSS feed Easy Print E-Mail this Message

Most Popular News
 
Home | News | All News | Reviews | Articles | Guides | Download | Expert Area | Forum | Site Info
Site best viewed at 1024x768+ - CDRINFO.COM 1998-2014 - All rights reserved -
Privacy policy - Contact Us .