technically, what is the difference between CDMA and GSM wireless services?
hi i am a electronics and communication engg student and looking for a fundamental , technical answer please help me out plzzzzzzz ……..people tell me the answer for this
CDMA employs spread-spectrum technology and a special coding scheme (where each transmitter is assigned a code) to allow multiple users to be multiplexed over the same physical channel. By contrast, time division multiple access (TDMA) divides access by time, while frequency-division multiple access (FDMA) divides it by frequency. CDMA is a form of "spread-spectrum" signaling, since the modulated coded signal has a much higher data bandwidth than the data being communicated. An analogy to the problem of multiple access is a room (channel) in which people wish to communicate with each other. To avoid confusion, people could take turns speaking (time division), speak at different pitches (frequency division), or speak in different languages (code division). CDMA is analogous to the last example where people speaking the same language can understand each other, but not other people. Similarly, in radio CDMA, each group of users is given a shared code. Many codes occupy the same channel, but only users associated with a particular code can understand each other.
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GSM is a cellular network, which means that mobile phones connect to it by searching for cells in the immediate vicinity. There are five different cell sizes in a GSM network—macro, micro, pico, femto and umbrella cells. The coverage area of each cell varies according to the implementation environment. Macro cells can be regarded as cells where the base station antenna is installed on a mast or a building above average roof top level. Micro cells are cells whose antenna height is under average roof top level; they are typically used in urban areas. Picocells are small cells whose coverage diameter is a few dozen metres; they are mainly used indoors. Femtocells are cells designed for use in residential or small business environments and connect to the service provider’s network via a broadband internet connection. Umbrella cells are used to cover shadowed regions of smaller cells and fill in gaps in coverage between those cells. Cell horizontal radius varies depending on antenna height, antenna gain and propagation conditions from a couple of hundred meters to several tens of kilometres. The longest distance the GSM specification supports in practical use is 35 kilometres (22 mi). There are also several implementations of the concept of an extended cell[12], where the cell radius could be double or even more, depending on the antenna system, the type of terrain and the timing advance.
Indoor coverage is also supported by GSM and may be achieved by using an indoor picocell base station, or an indoor repeater with distributed indoor antennas fed through power splitters, to deliver the radio signals from an antenna outdoors to the separate indoor distributed antenna system. These are typically deployed when a lot of call capacity is needed indoors; for example, in shopping centers or airports. However, this is not a prerequisite, since indoor coverage is also provided by in-building penetration of the radio signals from any nearby cell.
The modulation used in GSM is Gaussian minimum-shift keying (GMSK), a kind of continuous-phase frequency shift keying. In GMSK, the signal to be modulated onto the carrier is first smoothed with a Gaussian low-pass filter prior to being fed to a frequency modulator, which greatly reduces the interference to neighboring channels (adjacent channel interference).
Categories: Wireless Services Tags: 12, access, act, ad, airport, airports, Ali, all, also, analog, and, antenna, antennas, ap, area, as, at, av, Ban, band, bandwidth, Bo, broadband, business, but, call, Can, Capacity, car, carrier, cell, Cellular, center, ces, city, code, Coding, Comm, communic, communication, connect, connection, coverage, Da, Data, de, design, difference, distance, Distributed, distributed antenna syst, DV, electronic, electronics, en, env, environment, ERF, exam, extended, fi, First, for, FROM, fun, gm, Group, GS, gsm, help, high, higher, how, HR, if, in, install, internet, ip, is, IT, K, la, lan, language, las, LED, live, long, Look, low, lte, M, mac, may, me, media, mini, mobile, mobile phone, mobile phones, mod, Modulation, multi, multiple, Muni, nas, Near, NEC, need, net, Network, nic, no, not, of, OI, on, One, only, os, Outdoor, over, pass, people, phone, phones, Physical, PIN, ping, PLI, port, pre, pro, Propagation, Provide, provider, radio, Rate, read, Rio, road, ROM, Ron, rts, sc, search, service, Services, share, shopping, signals, sim, small, Small business, Speak, speaking, special, Spectrum, SS, student, support, system, take, Tech, technical, technology, ted, that, the, they, This, Through, time, to, Top, transmitter, TRI, Turn, two, UC, UL, UM, UN, up, Use, user, users, Using, what, who, wi, wire, Wireless, wireless service, wireless services, With, work
This is one business that you need to communicate with.
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If you go to debtconsolidationconnection.com you will find the answers you are looking for. They are a 501(c) (3) non-profit organization. This means that since they are a non-profit they are under the pressures that some credit counseling agencies are under. They can help you without having to make a profit off of your situation. They will offer free counseling to determine if debt consolidation will be of benefit to your situation. They are all about providing simple solutions that will help you find the peace that financial freedom can offer.
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The Future Of Wireless Uk Broadband
Wireless broadband in the UK has never seemed to take off as well as wired broadband. Most households in the UK have the ability to get broadband internet, but wireless access is limited.
There are many reasons why wireless internet is better than wired internet, but in the UK it seems that no provider can get it to work for the users. It may just be, though, the answer to those living in remote areas where broadband service is less than desirable.
The wireless providers are finding a niche market in remote areas, the younger generation and business minded people who are seeing the perks of a wireless connection.
The difference between wireless and wired internet is basically that wireless internet uses no wires, where wired internet does. A wireless service is sent through radio signals instead of through lines and cables.
A person with a wireless connection can hook up to the internet without ever hooking anything into their computer. With a little set up the computer is ready to be used with a wireless internet service.
Then a person can use their computer wherever they like, as long as it is within an area where wireless broadband is offered. Wireless internet provides so much freedom to both providers and users.
For the provider wireless UK broadband is a far better solution than wired. Wireless internet connections are much easier to set up and maintain than wired services. It is also far easier to get wired services to remote areas than wired services, which is why wireless service is heavily promoted to people in those areas.
For the user, wireless internet offer flexibility. Nothing wired into a computer, no need to add new lines and far fewer maintenance issues.
With a wireless connection a person is no longer confined to their home, hooked into the broadband connection, they can use their wireless connection around their home or in many of the public places that offer wireless broadband access, like pubs or restaurants.
Wired internet is most popular for laptop computers and mobile phones. Many people do not see the idea stretching to their home computer and feel that it is complex and too involved for them to deal with. With three-quarters of the population of the UK using broadband services, only a third are actually using wireless technology.
The internet choices in the UK change rapidly. Wireless UK broadband is still fairly new, but many companies are jumping onboard to provide it to their customers. Currently wireless
UK broadband is available to limited areas. As the providers work through the kinks and get more users interested, it is likely that wireless broadband will overtake wired broadband as the internet service of choice.
For more information on how UK broadband contact http://www.ukispreview.co.uk
Robert Michael
http://www.articlesbase.com/internet-articles/the-future-of-wireless-uk-broadband-83843.html
Categories: Wireless Services Tags: access, act, ad, add, all, also, and, ap, area, as, at, av, Ban, band, better, Bo, boa, broadband, broadband access, business, but, cable, call, Can, ces, Change, computer, Computers, connect, connection, contact, custom, customer, customers, de, difference, en, fi, find, for, free, freedom, Future, gen, Generation, get, hang, have, hold, holds, home, household, how, HR, if, in, INFO, information, internet, into, is, ISP, issues, IT, K, la, Laptop, like, long, M, maintenance, Mark, market, may, me, mobile, mobile phone, mobile phones, MOT, NEC, need, net, new, nic, no, not, of, OI, on, One, only, os, over, people, phone, phones, PIN, ping, pre, preview, pro, Promo, Provide, provider, providers, public, radio, read, remote, review, road, ROM, SEN, service, Services, signals, solution, SS, take, Tech, technology, ted, that, the, their, then, they, Through, to, too, Top, UC, uk, UL, UM, UN, up, Use, user, users, uses, Using, who, wi, will, wire, wired, Wireless, Wireless Internet, wireless service, Wireless Technology, With, work, you
Antamedia HotSpot Software – HotSpot Billing WiFi Software
Antamedia HotSpot software helps you in controlling and billing your customers for the Internet usage. It is suitable for all the purposes where a customer should be prompted to type the username and the password to get the Internet access. Software includes billing, statistics and reporting with many other useful features. It is hardware independent and you can use any type of access point, router, switch in otder to control your WiFi, WiMax, LAN, Cable, DSL, Satellite connection
Duration : 0:3:49
Categories: WIFI Hotspots Tags: access, access point, all, and, as, at, bill, cable, Can, captive portal gateway, ces, connect, connection, Control, custom, customer, customers, de, dsl, en, fi, for, get, Hardware, help, hot, hot spot software, hotel hotspot, hotel room internet, hotel Wifi, hotspot, hotspot billing, hotspot management, hotspot software, if, illing, in, internet, internet access, is, IT, la, lan, M, me, media, NEC, net, of, OI, on, os, pass, poi, point, port, pro, report, ROM, router, satellite, should, software, Spot, SS, statistics, switch, table, ted, the, to, UIT, UL, usa, Use, user, war, wi, wi-fi billing, wi-fi software, wifi, wifi billing, wifi management, wifi software, wimax, windows hotspot, With, word, you, your, youtube
what is the diffrence between wifi and broadband in a pda?
i am looking at the motorola q and it says it supports broadband but a review said that it doesnt have wifi.
WiFi means that the PDA is equipped with a capability of connecting to the wireless networks, for example WiFi routers commonly installed in homes or hotels, etc.
Using WiFi, you don’t user any minutes of data exchanges with the Cell Phone provided internet.
When the PDAs say that Broadband is available, they mean using the Cell Phone providers network you can use the internet to browse at high speeds. Most of the cell phones now a days have broadband EDGE or 3G connection available.
EDGE network is widely available with Cingular for example.
Similarly, Verizon and Sprint have their own version of high speed data transfers available for the cell phone users.
Coming back to WiFi enabled phones. I think they are better as you can use it to connect to your computer at home or work or any wifi network available for free.
This way you are not charged any data rate for browsing. You can browse for unlimited hours without having to pay a penny.
NOTE: ALL THE WiFi enabled phones also support the Broadband as well. I don’t know if any one does not.
So go with phone that has WiFi.
I’ve "Cingualar 8125" It is a great phone and has almost everthing that you can ask for.
Check it out at Cingular or google
Categories: PDA Reviews Tags: 12, 3G, ad, all, also, and, ap, as, at, av, AVING, Ban, band, better, broadband, browse, but, Can, cell, cell phone, Cell Phones, Change, check, Cingular, Comm, computer, connect, connection, Da, das, Data, day, de, don't, edge, en, enable, enabled, exam, fi, for, free, google, hang, have, high, high speed, home, hot, hotel, hotels, hours, if, in, install, internet, ip, is, IT, K, la, LED, Look, M, me, minutes, MOT, MOTO, Motorola, NEC, net, Network, networks, no, not, of, on, One, only, os, pda, Pdas, phone, phones, port, pro, Provide, provider, providers, Rate, review, road, router, routers, rts, sim, SPEED, sprint, SS, support, ted, that, the, their, they, think, This, to, two, UL, UN, unli, Unlimited, up, Use, user, users, Using, verizon, what, wi, wide, wifi, wifi router, Wifi Routers, wire, Wireless, With, work, xchange, you, your
Will iPhones Fly with Free WiFi?
http://live.pirillo.com – AT&T has now made it so you can now get online with your iPhone anywhere there is a HotSpot of theirs… including airports! Finally! It used to be a pita to try to get a connection in an airport. Not anymore, thanks to AT&T!
Duration : 0:5:51
Categories: WIFI Hotspots Tags: ad, airport, airports, all, anywhere, Apple, as, at, att, blog, cafe, Can, chrispirillo, connect, connection, de, fi, free, Free WiFi, geek, geeks, get, help, hot, hotspot, if, in, information, ip, iphone, is, IT, K, live, lockergnome, M, macrumors, NEC, no, not, of, on, One, online, phone, phones, pirillo, port, review, rts, Spot, starbucks, thank, the, their, to, Use, video, wi, wifi, will, With, you, your, youtube
Create A Wifi HotSpot! With a Mac, an Ethernet Connection, and Airport.
How I Make Money Online:
CashCrate.biz
http://failblog.org/2009/06/22/urinal-fail-3/
This video will show you how to make a wireless internet hotspot (basically a wifi zone) with just your mac, an ethernet cord (connected to your modem of course), and airport.
TAKE NOTE: Most mac computers already have airport compatibility on their computers. If you have bought a mac within the last 2 and maybe 3 years, you most likely will have airport compatibility.
Watching this video will help you releive the stress of having to deal with a router (I myslef had trouble using a router).
When you create your hotspot you will be able to use internet on:
*Your iPod Touch (first and second generation (1st gen), and second generation (2nd gen, or 2g) (any ipod touch version for future references))
*Your Sony PSP (includes psp 1000, 2000, and 3000 series (any version of psp, for future references))
*Another computer that has wifi compatibility
***basically anything that supports wireless internet.
Enjoy.
I did not find this out myself, I was lurking around youtube, and found a video.
This is not the video where I found it from, but it is really similar. The video will show you how to do this on MAC, Vista, and XP (Windows Vista, Windows XP)
I did not make the above linked video.
Comments by YouTube users:
“For those who are clueless:
The ethernet cord is what transfers the data from your modem to the computer. The modem is what connects to your ISP to get an internet connection. He is using the built in AirPort Card in his Mac Mini to broadcast the connection.
Hope that helped.”
–BigAl109
“Damn you just saved about 100 dollars plus!!!! Thanks…”
–xXxSandmanzRiPPiN
Duration : 0:12:51
Categories: WIFI Hotspots Tags: 12, 200, 2009, 2G, 30, About, ad, airport, all, and, as, at, av, AVING, blog, Bo, broadcast, but, call, car, Card, cash, ces, Comm, computer, Computers, connect, Connected, connection, cours, course, create, Da, Data, de, Elf, en, enable, ethernet, fi, find, First, for, FROM, Future, gen, Generation, get, have, help, hot, hotspot, how, how to, if, in, internet, Internet hotspot, ip, ipod, ipod touch, is, ISP, IT, K, la, las, like, link, M, mac, make, may, me, mini, mod, money, my, NEC, net, Network, no, not, of, on, One, online, os, PIN, plus, pod, port, psp, Rate, read, real, really, road, ROM, router, rts, San, SD, second, self, series, show, sim, sony, Spot, SS, support, take, ted, thank, that, the, their, This, to, touch, Trouble, UC, UN, up, uri, Use, user, users, Using, video, Vista, Watch, what, who, wi, wifi, wifi hotspot, will, window, windows, windows vista, wire, Wireless, Wireless Internet, With, xp, you, your, youtube
Why Is Wireless Technology Is Taking Over How We Live ?
Wireless Internet technology, also known as WiFi, is really taking over the way people access the Internet and it has become widely popular in a very short time. The reason for this is it allows individuals to access the Internet via a network hot spot without the use of cables or wires. The signal is simply transferred through radio signals, which makes connecting to the Internet via your computer in different locations very easy.
Since wireless technology makes connecting to the Internet as simple as possible, many businesses, universities, hotels, cafes, schools, airports and homes are realizing the importance of offering easy Internet connections to both students and professionals. Generally, hotspots are offered to patrons at a reasonable hourly rate or either free, depending on where the hot spot is and who the target market is.
The one disadvantage these businesses have that install wireless networks is that any user in the area of the network can log on. For those offering free service this is not big deal, but for those charging for Internet it is. There are, however, security precautions that can eliminate unauthorized users that include a virtual private network and Internet Protocol Security.
The hot spots are really catching on worldwide, so if you are traveling or even just in your city, you will notice many areas that say hot spot or Internet zone. Cafes and bookstores as well as hotels and airports are some of the more popular areas that you will see on a regular basis with hot spots. However, more and more locations are noticing the need for this service and offering it.
If wireless Internet is something you really enjoy in the real world, then you can also have it in your own private home or business. It makes working or surfing the web significantly easier for all the Internet users because you can work wherever you need or want without the hassle of a lot of wires and cables. So, if you want wireless Internet go ahead and have it installed or install it yourself because it is really effortless and takes little time.
There is some equipment you will need to get started, of which you can buy yourself or pay a technician for all of the equipment and the service of installing the wireless Internet. Basically, you need to have a high speed Internet service, a router, and then each computer that will access the network needs a wireless Internet card if you did not buy it WiFi ready.
If you want to install wireless yourself you should simply buy the recommended materials and then follow the directions. There is a lot of help online that will guide you through the process. However, if you don’t feel like dealing with the headache then simply hire a technician to handle the whole process for you.
Finally, when you have wireless Internet installed in your home or office, remember that you should take some precautions to prevent your neighbors or other unauthorized users from stealing your Internet. A virtual private network or Internet Protocol Security will secure your network and allow only authorized users to connect.
Jason Roberts
http://www.articlesbase.com/advertising-articles/why-is-wireless-technology-is-taking-over-how-we-live–58312.html
Categories: WIFI Hotspots Tags: access, ad, advantage, advertising, airport, airports, Ali, all, also, and, area, as, at, av, become, Bo, Book, business, but, buy, cable, cafe, call, Can, car, Card, ces, city, Comm, computer, connect, connection, Da, de, direct, don't, DV, easy, Elf, en, Event, fi, for, free, FROM, gen, get, have, help, high, high speed, high speed internet, home, hot, hot spot, hot spots, hotel, hotels, hotspot, hotspots, how, HR, if, Import, in, install, internet, ip, is, IT, Jason, K, la, LED, like, live, Liz, low, M, make, Mark, market, mate, me, nat, NEC, need, net, Network, networks, nic, no, not, of, offering, office, on, One, online, only, os, over, people, port, pre, private, pro, professional, protocol, radio, Rate, read, real, really, recommended, ROM, Ron, router, rts, sc, School, secure, Security, self, service, Short, should, signals, sim, simple, SPEED, Spot, SS, Start, started, store, student, students, surf, take, Tech, technology, ted, that, the, then, This, Through, time, to, travel, two, UL, UN, uri, Use, user, users, virtual, WAN, web, who, wi, wide, wifi, will, wire, Wireless, Wireless Internet, Wireless Technology, With, work, World, worldwide, you, your
Hughes 9250 BGAN Mobile Satellite Terminal
Imagine connecting at IP broadband rates of up to 492 kbps (depending on look angle) transmit and receive while on the movewith a complete mobile communications package that includes an IP broadband satellite IP modem and tracking antenna. Thats exactly what comes with the breakthrough Hughes 9250 mobile satellite terminal. Fully approved for operation on Inmarsats global* BGAN satellite service, it means high-performance connectivity on the move for the most demanding environments. Ideal for emergency responders, reporters, and mobile workers who need reliable, high-speed connectivity on the move. Collaborate with staff back at headquarters using video, voice, and data simultaneously. Create a wireless hotspot for team members on the scene using the built-in WiFi Access Point. The Hughes 9250 is IP-compatible and offers selectable, dedicated Quality of Service levels. And its easy to install on any vehiclethe compact tracking antenna is packaged with a magnetic roof mount and a single cable connection. The Hughes 9250 allows you to send and receive IP packet data via Ethernet and WLAN interfaces in a land-vehicular application. In parallel with the packet data services, the same terminal supports a circuit switched voice call or a 64 kbps ISDN data call. <p align=center> <img src="http://www.satellitephone.pro/img/BGAN%209250_Network_Diagram.jpg"> </p> The Hughes terminal controls the tracking antenna through the Antenna Control Unit (ACU). This small interface box modulates control signals from the terminal onto the RF link between the terminal and the antenna. All components are powered by a single power supply that plugs into a vehicular 12V power source.
Categories: Mobile Communications Tags: 12, access, access point, act, ad, Ali, all, and, antenna, ap, app, application, as, at, Ban, band, Bo, Box, broadband, cable, call, center, ces, comes, Comm, communic, communication, communications, connect, connection, Control, create, Da, Data, de, easy, emergency, en, env, environment, ERF, ethernet, FACE, fi, for, FROM, full, gen, glob, global, GS, high, hot, hotspot, HR, if, in, install, interface, into, ip, is, IT, its, K, la, lan, land, link, Look, low, M, magnetic, mandi, mars, me, members, mobile, Mobile Communication, Mobile Communications, mod, Muni, NEC, need, net, Network, nic, of, OI, on, One, opera, os, Package, performance, phone, PIN, ping, PLI, poi, point, port, powered, pro, quality, Rate, report, road, ROM, Ron, rts, satellite, sc, SD, SEN, service, Services, shopping, signals, sim, small, source, SPEED, Spot, SS, support, switch, table, TEAM, ted, Terminal, that, the, This, Through, to, tracking, two, UIT, UL, UN, up, Using, video, voice, what, who, wi, wifi, WiFi access, wire, Wireless, wireless hotspot, With, WLAN, work, Yahoo, you
Broadband Gives You Access To The Internet, Phone And Tv
Do you remember using the Internet back when you had to dial in using a modem. If you are unlucky enough to still be using dial-up Internet access, I feel for you. The internet is a growing and dynamic entity and everyone will have broadband sooner or later.
Naturally companies try to offer access to internet in growing number of ways. Assuming the user has the correct hardware, a wi-fi account, and is in range of the transmitters, the service allows the user to connect to the internet at broadband speeds without the use of cables. Users can log on to the internet at these hotspots provided they have an account with the broadband supplier and the necessary wireless equipment, such as a wireless laptop or broadband-enabled mobile phone.
An extra phone is the only way to get calls that cannot be received due to the dial up connection. Fixed line operators are now incorporating wireless with their traditional phone services providing ease of having one device and one bill for both mobile and fixed line calls. You can take it out of your phone bill.
Broadband phone actually uses voice over internet protocol (VoIP) to carry phone calls through the internet. There are also a number of companies that has VoIP as a free service.
Digital Subscriber Lines, or DSL uses the existing customer phone lines to provide internet or intranet access to businesses and homes using high-speed broadband technology of varying levels. But even with all the technology that has gone into the making of the Internet, there seems to be more to be expected than has been seen. It’s easy to understand why; the technology industry defines it in different ways as well.
Just be sure you do not choose an ISDN line (because it is getting obsolete) or power line (because the technology is not mature, and it will be some years before the bugs are ironed out). The cheapest broadband deals allow for such technology to reach our homes for less than $10 per month.
Ok, on to the two major broadband access methods, cable and DSL. There is cable access, DSL access, satellite access. Although cable broadband internet is a whole lot faster than dial-up, I usually experience a slight delay when opening a webpage.
Perhaps most people do not notice the latency associated with cable internet, but it got my attention right away. So are cable television modems, which have similar speeds. Approximately 4 million people in the UK use ADSL with an extra 2 million using a cable connection, meaning 6 million people in the UK have an always-on internet connection.
The fact is that anything less than the speed supplied by a broadband cable has become inadequate for today’s internet users.
Providers
However it has emerged that broadband providers touting such products are not revealing the full story to their customers. The key will be for broadband providers to develop the services that broadband allows for, and to deliver them to as many households as possible. High-speed Internet services are growing in popularity because intense competition from broadband providers is continually driving the product exposure in the marketplace to new highs, and prices to new lows.
Connecting to the Internet for the first time in your home or office is as easy as securing a fixed telephone line (which you probably already have) and signing up to one of the dozens of Broadband Providers, like AOL and others.
Satellite
Bummer indeed, but you still have broadband Direct PC by satellite and it seems to make it through those clouds and so you can surf the NOAA website and get the latest results or watch video streams of the local TV station right. Broadband Internet by Satellite is about the coolest invention in the World and indeed it has helped the unconnected become connected even if they live in the middle of nowhere. Did you know you can get a special satellite antenna hooked up on your motor home or recreational vehicle that will enable you to get the Internet anywhere in North America.
Television
So they are bundling broadband with other products, such as home phone, digital television and mobile. The acronym is used to describe services which broadcast on-demand television programming to consumers, delivered via a broadband connection on normal telephone line to TV screens. Broadband television is a means of providing TV programs via the Internet.
Broadband Television is being hailed as the biggest change in the way we watch television since it was first invented.
Keith George
http://www.articlesbase.com/internet-articles/broadband-gives-you-access-to-the-internet-phone-and-tv-84296.html
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