Wi Max tec

RF (Radio Frequency) Engineering

2011-03-25T13:57:00.004+06:00

RF (Radio Frequency) Engineering

RF engineering deals with the wireless system or device which frequency ranges from 3khz to 300Ghz. To be a RF engineer you need a clear concept on Mathematics,Physics,General Electrical and electronics theory. Besides you need specialized taring and education on propagation rule and behavior,microstrip design etc. RF engineering may categories into four parts. These are:

Network Planning and Design or NPD.
Network Implementation and Optimization or NIO.
Network Operation and Maintenance (Net O&M).
Network Quality and Performance (Net Q&P).

To be a good RF engineer we need several years of professional knowledge from field, as well as from planning and design section. RF engineer has good knowledge on transmission system,device and antenna system. Antenna is such a device which is a key concern of a RF engineer. Actually quality of a wireless network largely depends on the antenna. Every RF engineer should capable of design a antenna required for his system. Actually shape and size of a network largely depends on RF engineer. The device of Transmitting and Receive end be selected by the RF engineer. Hence the supporting device should be by the choice of RF engineer.

WiFi Wireless Fidelity_Part-2

2010-06-22T04:26:00.003+06:00

History
In the early 1992 Australia's Commonwealth Scientific and Industrial Research Organization (CSIRO) obtained a model/patent in

Australia

for wireless data transfer technology. In late 1996,

Australia

obtained another patent for the same technology in the

USA

. IEEE 802.11 uses the mathematical formula in the model. In the mid 2000 Australia's Commonwealth Scientific and Industrial Research Organization (CSIRO) established the world's first wireless local area network (WLAN) internet connection.

In April 17th-20th, 2009, fourteen tech companies including major market share holder like Intel, Microsoft, HP, Dell, decided to issue CSIRO two hundred and fifty million dollar for their Wi-Fi model/patent development.

EU influences overall in deploying of wireless phone system, but the USA leads in Wi-Fi technology moderately because it leads in notebook pc usage. In mid July 2005, there were nearly seventy thousands Wi-Fi networks worldwide, most of in the USA, followed by the UK and Germany. The USA and EU have about eighty percent of the worldwide Wi-Fi service holder. Tactics are in progress in urban areas of the USA to afford cost free public Wi-Fi network. Even with these numerous numbers and more expansion, the extent of actual Wi-Fi usage is much less than expected. A research company Jupiter Research found that only fifty percent of people have used Wi-Fi and only six percent in an open place.

WiFi Wireless Fidelity_Part-1

2010-06-22T04:15:00.003+06:00

History
Wi-Fi supports both single-carrier direct-sequence spread spectrum radio technology (a portion of the larger family spread spectrum systems) and multi-carrier orthogonal frequency-division multiplexing radio technology. The deregulation of convinced radio-frequencies for unlicensed spread spectrum employment enabled the expansion of Wi-Fi products, IEEE 802.11 just the once contestant HRF (Home Radio Frequency), Bluetooth, and lots of other products like a few types of cordless telephones.
In the USA, the Federal Communication Commission (FCC) pioneer of unlicensed spread spectrum presented in rules implemented on 9th, May, 1985.
Many countries just after implemented these FCC standards, enabling apply of this technology almost all key countries. The FCC plan was offered by Michael Marcus of the FCC personnel in 1980 and the consequent authoritarian action took half a decade. It was portion of a broader suggestion to permit civil use of spread spectrum technology and was denied at the time by majority equipment manufacturers and most of the radio system operators.
IEEE 802.11 (Wi-Fi) technology started in a 1985 under the U.S. Federal Communications Commission that released numerous bands of the radio spectrum for unlicensed utilization.

Mobile VPN

2010-06-11T15:22:00.001+06:00

Concept of Virtual Private Networks

Concept of Virtual Private Networks predates data networking. The term is used by the traditional phone companies to refer to services offered to various entities. In some cases it is as simple as a leased line facility. In others it is a complete outsourced network that is carved out of the “public network” for an entity’s exclusive use.

A virtual network essentially a connection that appears to the users as a dedicated end to end connection. It is not important for the user to know actual route by the data. In fact the route will often change during the course of session. In order to make the network private (in an IP environment) other services must be implemented.

To ensure privacy several things must happen. The user must be verified to be eligible to use the VPN. This is accomplished through the use of RADIUS servers and share certificate methods. The data must be protected or made private. This is accomplished through various tunneling techniques.

With a private network, user expects a certain level of service. This requires the ability to implement Quality of Service schemes. While this can be accomplished, it becomes more complex in an IP environment with varied paths and providers. In a Mobile IP environment it is further complicated by mobility and roaming issues.

Banglalion the leading Wimax provider in Bangladesh

2010-02-06T02:59:00.004+06:00

Banglalion is the pioneer of Wimax (World wide interoperability of microwave access ) in Bangladesh,it is a sister company of "Sunman Group of Companies". Banglalion acquired first BWA license on November 18, 2008 in Bangladesh, whoich is provided by the Bangladesh telecommunication regulatory commission (BTRC). BTRC is the only regulatory body of Bangladesh which regulates the countries telecommunication and networking companies. Banglalion is committed to provide country wide Broadband Internet services and other associated service via Wimax.Banglalion plans to bring the whole country under WiMAX coverage and make WiMAX technology an essential part of everyday life. Within the 2nd quarter of 2010, Banglalion plans to bring the whole mega city Dhaka and it's surroundings under WiMAX coverage. Within the 2nd quarter of 2011, Banglalion's vision to bring most areas of the country under its seamless coverage and thus Banglalion will provide its valuable customers with innovative, affordable and useful product line of Banglalion.

Wireless LAN Standard

2009-03-24T20:17:00.002+06:00

The IEEE standards are created by groups of people that represent many different organizations, such as academics, corporate business, government and the military .Because standard set forth by the IEEE can have such an impact on the expansion of technology, the student can take many years to be created and decided upon, although approval of 802.11 standards seems to have accelerated seriously in the last few years, probably due to the excessive demand for 802.11 products and service.

RF Properties.

2009-03-24T15:46:00.002+06:00

Radio Frequency Properties

Amplitude
Frequency
Wavelength
Phase
Polarity

Wimax and Bangladesh

2008-11-11T20:25:00.007+06:00

Now a days there is a hard talked between wireless professionals in Bangladesh is WiMAX. Everyone in the industry is sincere of the technology and its value to the future of the Bangladesh. But there is a com vital difference about WiMAX license. In a recent workshop ‘WiMAX in Bangladesh: now and future’ held in Dhaka, Bangladesh, BTRC chairman Mr. Manzurul Alam expressed that BTRC is likely to invite application for WiMAX license in half of the July. The chairman said they have yet to take decision on the frequency rate for WiMAX and possible target group for the license. Now the question is who these target groups are and who will be the one get priority over others and why?

But the Bangladeshi technical persons point of view, " it should be give to the native entrepreneur".
They have also said about ninety percent of the countries wireless communication market is already captured by the foreign companies, as a result a huge amount of foreign currencies are going out annually.

How to ask people visit your blog

2008-11-11T18:51:00.002+06:00

Hi
this is Hassan Imam, I've visited your blog,you can visit my........
my blog address:
http://topbdnews.blogspot.com
http://newsasia24.blogspot.com
http://wimaxtec.blogspot.com
http://lovesmsbd.blogspot.com
http://bdtime.blogspot.com
http://banglaboyes.blogspot.com

Low Power WiMAX Chipsets Accelerate the Broad Adoption of WiMAX in Mobile Devices

2008-10-29T15:25:00.005+06:00

Broad adoption of WiMAX networks and the fulfillment of the WiMAX "vision" greatly depend on the proliferation of WiMAX chipsets into battery operated mobile devices, including handsets, ultra mobile PCs and a variety of consumer electronic devices. One gating factor had been the power consumption of the WiMAX subsystem which puts a drain on batteries. The WiMAX chipset ecosystem has made great strides in this area. But have they met the "low power bar" necessary for wide adoption of WiMAX into mobile devices?

Trendsmedia, the organizers of the WiMAX World 2008 show, which took place in Chicago, USA on September 30 through October 2nd 2008 wanted to find out. WiMAX20/20, a leading WiMAX consultancy was recruited to organize the WiMAX Live - Low Power CPE Chipset Shootout. A first in the WiMAX industry, this session gave an opportunity to WiMAX chipset vendors to show live measurements of their low power solutions and explain how they are meeting the low power challenge. Among the merchant chipset vendors that were invited to the shootout were Altair, Beceem, Comsys, GCT, Intel, NextWave, Runcom, Sequans, and WaveSAT.

In order to establish a low power performance bar, the latest and most popular 3G handheld devices were surveyed to determine the battery life performance of these devices. Both EVDO and HSDPA based products were reviewed including the Palm Treo, Apple 3G iPhone, and the RIM Blackberry. A review of specifications concluded that "Talk Time" for these devices ranged between 4 hours and 6 hours. Similarly, Internet usage time averaged between 5 hours and 6 hours. WiMAX20/20 established two performance bars as follows:

More......

Apple & KT sign deal to put mobile WiMAX in MacBooks

2008-10-15T02:57:00.002+06:00

The tentative agreement brings mobile WiMAX to Korea's Apple laptops and envisions always-on access for iPods.Rumors have surrounded previous Apple announcements suggesting the company's entry into the WiMAX market. Last week Korea provided the headline that people have been waiting for. While much of the WiMAX world had their eyes on Baltimore in the United States launch of mobile WiMAX service, Apple Korea and network operator Korea Telecom (KT) signed a memorandum of understanding on Wednesday to cooperate and bundle mobile WiMAX support for Apple's MacBook laptops. The pairing would be available to customers on KT's WiBro mobile broadband network.

Optimization and Sensitivity Analysis of a WiMAX Business Case

2008-09-26T17:55:00.004+06:00

In Part 1 of this three part series article, we outlined the process of gathering the input parameters for a comprehensive WiMAX business case. In Part 2 we discussed how to define a variety of service plans and marketing plans in order to build the top line in a WiMAX business case. Here we will focus on the process of selecting the key performance indicators that have the greatest effect on a WiMAX business case, the process of performing sensitivity analysis, and the process of optimizing a WiMAX business case.

WiMAX Opportunities in Africa

2008-09-26T17:50:00.002+06:00

The growth and development of WiMAX in Africa has taken place mainly during 2006-2007. At the beginning of 2006, the WiMAX subscribers figure for Africa was just a few thousand. But according to the WiMAX Operator Tracking Service, WiMAXCounts, at the end of 2007 that continent accounts for more than 20,000 WiMAX s ubscribers.

Bangladesh being connected with Trans-Eurasia Information Network

2008-09-17T01:12:00.004+06:00

To promote ICT sector development
Bangladesh is going to be connected with 'Trans-Eurasia Information Network' (TEIN-3) in order to upgrade the quality of education in the country ........More

Subscriber units(Client Units)

2008-09-16T00:52:00.001+06:00

WiMAX subscriber units are available in both indoor and outdoor versions from several manufacturers. Self-install indoor units are convenient, but radio losses mean that the subscriber must be significantly closer to the WiMAX base station than with professionally-installed external units. As such, indoor-installed units require a much higher infrastructure investment as well as operational cost (site lease, backhaul, maintenance) due to the high number of base stations required to cover a given area. Indoor units are comparable in size to a cable modem or DSL modem. Outdoor units are roughly the size of a laptop PC, and their installation is comparable to a residential satellite dish.

Broadband access

2008-09-16T00:44:00.002+06:00

Many companies are closely examining WiMAX for last mile connectivity. The resulting competition may bring lower pricing for both home and business customers or bring broadband access to places where it has been economically unavailable.WiMAX access was used to assist with communications in Aceh, Indonesia, after the tsunami in December 2004. All communication infrastructure in the area, other than Ham Radio, was destroyed, making the survivors unable to communicate with people outside the disaster area and vice versa. WiMAX provided broadband access that helped regenerate communication to and from Aceh.In addition, WiMAX was used by Intel to assist the FCC and FEMA in their communications efforts in the areas affected by Hurricane Katrina

Wimax Uses

2008-09-16T00:40:00.002+06:00

The bandwidth and range of WiMAX make it suitable for the following potential applications:

Connecting Wi-Fi hotspots with other parts of the Internet.
Providing a wireless alternative to cable and DSL for "last mile" broadband access.
Providing data and telecommunications services.
Providing a source of Internet connectivity as part of a business continuity plan. That is, if a business has a fixed and a wireless Internet connection, especially from unrelated providers, they are unlikely to be affected by the same service outage.
Providing portable connectivity.

WiMax Definitions

2008-09-16T00:36:00.003+06:00

The terms "fixed WiMAX", "mobile WiMAX", "802.16d" and "802.16e" are frequently used incorrectly.Correct definitions are the following:

802.16-2004 is often called 802.16d, since that was the working party that developed the standard. It is also frequently referred to as "fixed WiMAX" since it has no support for mobility.

802.16e-2005 is an amendment to 802.16-2004 and is often referred to in shortened form as 802.16e. It introduced support for mobility, amongst other things and is therefore also known as "mobile WiMAX".

Future development

2008-09-10T02:15:00.001+06:00

Mobile WiMAX based upon 802.16e-2005 has been accepted as IP-OFDMA for inclusion as the sixth wireless link system under IMT-2000. This can hasten acceptance by regulatory authorities and operators for use in cellular spectrum. WiMAX II, 802.16m will be proposed for IMT-Advanced 4G.

The goal for the long term evolution of both WiMAX and LTE is to achieve 100 Mbit/s mobile and 1 Gbit/s fixed-nomadic bandwidth as set by ITU for 4G NGMN (Next Generation Mobile Network) systems through the adaptive use of MIMO-AAS and smart, granular network topologies. 3GPP LTE and WiMAX-m are concentrating much effort on MIMO-AAS, mobile multi-hop relay networking and related developments needed to deliver 10X and higher Co-Channel reuse multiples.

Since the evolution of core air-link technologies has approached the practical limits imposed by Shannon's Theorem, the evolution of wireless has embarked on pursuit of the 3X to 10X+ greater bandwidth and network efficiency by advances in the spatial and smart wireless broadband networking technologies.

SIZE MATTERS

2008-09-10T02:03:00.002+06:00

Companies the size of IBM could fare better in a weakening economy than smaller rivals, analysts said, as customers pare back the number of vendors to focus on those deemed most resilient to an economic slowdown.
Demand for hardware appears to be trickling down to smaller manufacturers such as Sun Microsystems Inc, whose shares have been battered, losing 48 percent this year.
Sun, a maker of high-end servers, reported on Tuesday preliminary results in line with expectations, but that sparked a rally in its shares by investors who had feared much worse.
Jerry Dodson, a portfolio manager with Parnassus Investments, which manages $1.5 billion, said he fears other software makers may post weak earnings after Microsoft's disappointing results.
"It (the rough economy) seems to be hitting software more than the hardware," Dodson said.
SAP AG and Oracle Corp, the two biggest makers of business management software, look vulnerable, he said. Germany-based SAP is scheduled to report on July 29, while its California-based rival released results for its most-recent quarter last month, issuing a cautious earnings outlook and saying it expected software sales growth to slow.
Microsoft's online division posted an eighth consecutive quarter of decline, reporting an operating loss of $488 million. Industry analysts feel that bodes poorly for Microsoft's rival and acquisition target, Yahoo Inc, which reports results on Tuesday.
"Their weakness in the online division is an indicator in display advertising, which has follow-through implications for someone like Yahoo," Bagwell said.

Tech earnings diverge as economy weakens

2008-09-10T01:59:00.002+06:00

IBM and other technology companies whose products help big corporations save money or expand data storage capacity are faring better than those relying on consumers as the economy slows.
International Business Machines Corp, the world's biggest technology company, impressed investors by easily beating quarterly profit expectations and raising 2008 forecasts when it reported along with other big tech companies on Thursday.
In contrast, Microsoft Corp missed estimates amid concern about its online business and the economy, while Google Inc also disappointed. The Web leader told investors it was operating under "uncertain economic conditions" after a weaker-than-expected 35 percent quarterly profit increase.
Darren Bagwell, director of equity research at Thrivent Asset Management, which manages $73 billion, reckons IBM's results point to strong performances for companies like EMC Corp, the world's biggest maker of corporate storage gear. EMC releases its results on July 23.
"IBM's mainframe business was on fire," he said, pointing to a new line of computers that IBM introduced in February. They sold out at the end of the second quarter after the company's first major upgrade to its mainframes in almost three years. They are used in "green" data centers that help businesses save money on energy and maintenance costs.
In a teleconference with analysts and reporters on Thursday, IBM said demand from companies in developed countries looking to expand data centers contributed to its better-than-expected 22 percent rise in quarterly profit.
Bagwell noted both Microsoft and Google said they plan to invest heavily to develop larger, more sophisticated data centers so they can better compete with each other.
"They are spending a lot of money to build out the infrastructure they need," he said. "Someone is going to get the benefit of that, obviously."
Bagwell expects such infrastructure investment will also bolster profits at VMware Inc, whose software helps companies save money by allowing them to boost the efficiency of server computers.

Internet-oriented systems

2008-09-10T01:57:00.002+06:00

Early WirelessMAN standards, the European standard HIPERMAN and Korean standard WiBro have been harmonized as part of WiMAX and are no longer seen as competition but as complementary. All networks now being deployed in South Korea, the home of the WiBro standard, are now WiMAX.

As a short-range mobile Internet technology, such as in cafes and at transportation hubs like airports, the popular Wi-Fi 802.11b/g system is widely deployed, and provides enough coverage for some users to feel subscription to a WiMAX service is unnecessary.

Mobile Broadband Wireless Access

2008-09-10T01:53:00.003+06:00

Mobile Broadband Wireless Access (MBWA) is a technology being developed by IEEE 802.20 and is aimed at wireless mobile broadband for operations from 120 to 350 km/h. The 802.20 standard committee was first to define many of the methods which were later funneled into Mobile WiMAX, including high speed dynamic modulation and similar scalable OFDMA capabilities. It apparently retains fast hand-off, Forward Error Correction (FEC) and cell edge enhancements.
The Working Group was temporarily suspended in mid 2006 by the IEEE-SA Standards Board since it had been the subject of a number of appeals, and a preliminary investigation of one of these "revealed a lack of transparency, possible 'dominance,' and other irregularities in the Working Group".
In September 2006 the IEEE-SA Standards Board approved a plan to enable the working group to continue under new conditions, and the standard is now expected to be finalized by Q2 2008.

Introduction: WiMAX

2008-09-10T01:33:00.007+06:00

WiMAX, the Worldwide Interoperability for Microwave Access, is a telecommunications technology that provides for the wireless transmission of data in a variety of ways, ranging from point-to-point links to full mobile cellular-type access. The technology provides the users with an idea of enjoying the broadband speed without the actual requirement of any wires or bulky network structures. The technology is based on the IEEE 802.16 standard (also called WirelessMAN). The name "WiMAX" was created by the WiMAX Forum, which was formed in June 2001 to promote conformity and interoperability of the standard. The forum describes WiMAX as "a standards-based technology enabling the delivery of last mile wireless broadband access as an alternative to cable and DSL"(and also to High Speed Packet Access).

Currently, Pakistan has the largest fully functional Wimax network in the world. Wateen Telecom installed the network (with an initial rollout in seventeen cities) throughout Pakistan using Motorola hardware

Wi Max Technology

2008-07-14T14:55:00.001+06:00

Worldwide Interoperability for Microwave Access, is a telecommunications technology that provides wireless data in a variety of ways, from point-to-point links to full mobile cellular type access. It is based on the IEEE 802.16 standard, which is also called WirelessMAN. The name "WiMAX" was created by the WiMAX Forum, which was formed in June 2001 to promote conformance and interoperability of the standard. The forum describes WiMAX as "a standards-based technology enabling the delivery of last mile wireless broadband access as an alternative to cable and DSL" (and also to High Speed Packet Access).^{[citation needed]}