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Question

Measurement data transmission over a wireless network

Jan 17, 2015 3:02AM PST

Hello,
I am doing a project on the measurement and comparison of speed wireless networks(WIFI AND BT) from a mobile phone to a computer within the network.

Someone here did a similar experiment,or view similar experiments Web.

If so, I'd be happy if someone could share with me the information


thank you,
aviram

Discussion is locked

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Answer
Sorry
Jan 17, 2015 3:07AM PST

But since there's laboratory conditions and then real world the problem is that you can get really great results in a lab where there is no RF clutter or other interference. So you can predict the answer and it's great, lines up with exactly what you expect.

Go try that near a Starbucks and the numbers increase.

If the researcher can't grasp this they may be lost on their first outing. It doesn't matter what experiments since until they understand this, they may think that such numbers are reliable or could be used in a study.
Bob

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PS. my background.
Jan 17, 2015 3:12AM PST

Too many apps, embedded designs, RF links and more. I've met many researchers over the years and as I wrote, some can't get over the unreliability of such studies. In short, a packet could get there on the first try in a split second or it can be lost and the retry system takes over and it's gets there a second later.

Some of the worse designs don't use a handshake (UDP send only and hope it gets there) and those are fun to watch the designer learn it first hand.
Bob

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Hello Bob.
Jan 17, 2015 4:38AM PST

Hello Bob.

Thanks for the response.

I do not care whether the experiment was carried out in the laboratory or not.
Experiments interesting to me because I want to get a measure (even if not accurate), for the experiment.

Also, i want ti know how many packets to send, how large each package,

what is the speed that expected to get, even if the experiment carried out in the laboratory under optimal conditions.

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Remember we do have google.
Jan 17, 2015 4:44AM PST

All the tests I have access to are under lock, key and the company agreement to not share. I can however give you the rundown that it's all over the map depending on gear, configuration, and environment.

Only the newest researcher thinks it's packet size related. I can see that swap more times than a day at the race track.

Is there something you are trying to figure out? I mean all this really can be answered by copying a file of sufficient size and simple math. Again, it may be a new researcher here but after a while you learn that simple tests will do.
bob

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hello bob
Jan 18, 2015 4:52AM PST

Hello Bob.

I would be happy if you could sent to me the file,

And then I'll see how it can help me.

thank,
aviram

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Sorry but you'll have to create your own 1 GB file.
Jan 18, 2015 5:03AM PST
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Answer
Measuring data transmission.
Jan 17, 2015 4:54AM PST

Basically, if you send a 1 GB file and it takes 200 seconds, the speed = 5 GB a second, that 40 mbps a second. All you need to measure that: a stopwatch (and of course, a sender and a receiver).

To measure the number and size of the packages, you need to intercept the traffic either in the source, on the road or in the destination. That means rather low-level programming, inside the OS; or use a ready application like http://www.microsoft.com/en-us/download/details.aspx?id=4865/ or use one of those devices that monitor the network traffic by eavesdropping. After all, it's all in the air for anybody to pickup.

Kees