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This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License.
This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License.
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2 comments:
Intro:
1. If you have ever sat down in a lecture hall, Star Bucks, or even a field around campus with your laptop, turned on your computer and with out being connected to anything gotten on the internet, chatted with friends, or even played games online. Then you have used 802.11. Which is what I am here today to talk about. First I want to tell you all what it is and how it works. Hopefully from their you can get an overview of the technology, because after that I want to talk about the current uses of the technology. Finally I want to tell you what we can expect in the future with regards to 802.11.
Body:
1. So what is 802.11? 802.11 is a set of rules set up by IEEE. These rules govern how wireless Internet works. In other words 802.11 is the guiding force for all WiFi products. So how does 802.11 hardware work? To better understand I will be using the analogy of a person looking for another person at a party. First let me set the stage. The man in this story is the wireless card in your computer. The girl is the AP. AP stands for access point and is where your computer gets its connection to the Internet.
Here is how it works:
1. The wireless card gets power and starts to scan through channels, at this point it is looking for an AP with an SSID that matches the one it is looking for. You can think of this as thought the wireless card was a person just walking through the door of a frat house, and he needs to find a girl. So he starts looking…
2. The Wireless card finds a channel with the correct SSID, but before it can join this network it must be associated with it, so it send out an association frame. Back to the analogy. Our friend at the party finds the girl he is after, but she is dancing with a lot of other dudes. So our friend taps her on the shoulder, and waits for her to talk to him.
3. The AP checks its association table to make sure that the wireless card is allowed on, and has that the wireless card has the correct SSID. In other words our friend gives the girl his name, and she asks him if he knows what her name is. If he knows her name, and he is not on her list of people to not dance with, she lets him dance with her.
4. However each wireless card is only allowed a certain amount of time on which to transmit data. The wireless card will tell each other how long they intend to transmit, and all others must wait. In other words the girl can only dance with one dude for a little bit until he gets bored with her and lets her move to the next dude. From there the other guys have to be first to speak to her, in order to get her attention. This step continues until you want to leave the network.
Transition: So I hope this little analogy helped you understand the interaction between the AP and the wireless card in your computer. Because now I am going to talk about the current uses of 802.11 products.
1. 802.11 products are used in new RFID tags (RFID tags are the stickers that go on products at the store so they can be scanned easier.) 802.11 is used so that certain items can be located with in the store.
2. 802.11 products are used in warehouses as a way to allow workers to inventory products. With our being connected to wires.
3. Some new Internet phone use 802.11 as a way to connect to the Internet.
4. Home stereo: Currently Apple TV and other use 802.11 to stream music and video from the computer to the TV.
Transition: Lastly I want to talk about the future of 802.11, and some of the new and upcoming technologies that will make it faster and go longer distances.
1. The first future technology I would like to talk about is 802.11n. This new technology, which is not supposed to be out, yet will enable device to be more than 4 times faster, than they already are. Currently the fastest 802.11 devices top out a 54Mbps. This new standard will allow devices to reach speeds up to 248 Mbps. The new 802.11n devices will use a technology called MiMo. Which stands for Multiple Input Multiple Output. Basically this will allow for Wireless cards to both transmit and receive at the same time. While this may seem easy there becomes a problem when you try to make the antennas close together. If they get too close they will interfere with each other. This brings me to my next future technology.
2. Intelligent Antennas: All MiMo devices will carry devices called intelligent antennas. These antennas will aim themselves in the direction of the signal automatically and are highly directional, so they wont disturb their counterparts. It does this by using a method called beamforming. Beamforming basically uses a bunch of smaller directional antennas and will only allow certain ones to transmit. This allows for the IA to be directional and also have no moving parts. This is what will make MiMo transmit further.
Conclusion: Now that I have told you all about how 802.11works, its uses, and how it will be in the future. I hope that you can all realize how amazing it is that your wireless card even works, when you connect to the Internet.
References:
(2007). 802.11. Retrieved September 15, 2007, from http://en.wikipedia.org/wiki/802.11.
(2007). Multiple input multiple output. Retrieved September 15, 2007, from http://en.wikipedia.org/wiki/Multiple-input_multiple-output.
How WiFi Works.” Howstuffworks.com 1 September 2007 18 September 2007. http://science.howstuffworks.com/wifi_1.htm
I enjoyed your speech in class last week. You made it relatable to the audience using applications without using too much jargon. Also, your analogy was really funny and made people involved in your speech. Nice data, and great job.
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