Question on WIFI line speed ?

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Old 07-16-13, 08:37 PM
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Question on WIFI line speed ?

I have a 150Mbps b/g/n network router, and I have a desk top PC and a 7-inch Nexus tablet. Both the tablet and the PC are (wifi) wireless connected to the router. However, the PC gets line speed 150 Mbps, but the tablet only get 65 Mbps. Why ?
(they are right next to each other, about 6 feet from the router.)
 
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Old 07-16-13, 09:24 PM
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All wireless N products use MIMO (Multi-In Multi-Out) this works by ganging multiple radios and bonding the throughput. there may be a difference in how many radios are used, and how at what speed each connects. Not all wireless N products are the same.
 
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Old 07-17-13, 09:10 AM
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Thanks, but I don't think I understand your point. Are you saying my PC has better network WIFI card than the tablet ?
 
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Old 07-17-13, 09:27 AM
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You need to go in the wireless card settings and change to 20MHz/40MHz... You should get the faster speeds.

Some of my cards were running at 150 MHz but after going in the setting they know run at 300 MHz... Although they slow down at times for better throughput and speeds vary at times, but mostly hover around 248 MHz

Also go in your router settings and make sure its set for 300 MHz... That is if you have one that supports this speed...

802.11n Speed - How Can I Get an 802.11n Wi-Fi Speed Rating of 300 Mbps?
 
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Old 07-17-13, 10:29 AM
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802.11n works at either 2.4GHz or 5GHz. Your router is probably supporting both, but it looks like the Nexus 7 supports 802.11b/g/n at 2.4GHz only. I believe the 2.4GHz band in theory can support full-bandwidth 802.11n, it's rare that it is configured like that because it would end up using multiple 2.4GHz channels.

It's been a while since I've gotten into the nuts and bolts of wifi, but that could be part of the issue.
 
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Old 07-17-13, 10:37 AM
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speed of up to 150 mbs use 20 mhz. To use 300 mbs you need to also use 40 mhz... In the card settings there should be a place to change this... They are usually set for 20 mhz only.. You have to change it to 20/40 mhz.. One channel for transmit and one for receive gets you the faster speed...
 
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Old 07-17-13, 06:31 PM
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Folks, Thanks for all the information, some of these way over my head, but I did learned something. Here I think I found the answer (see the follow paragraph which I copied from Google)

The Nexus 7 includes support for single spatial stream 802.11b/g/n on 2.4 GHz only. That ends up being a PHY rate of 65 Mbps (single spatial stream with no SGI). ASUS has been using AzureWave modules for basically every single one of its tablets, and the Nexus 7 is no exception.
 
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