Comments on: How does 802.11n get to 600Mbps? http://www.wirevolution.com/2007/09/07/how-does-80211n-get-to-600mbps/ Mobile Unified Communications Thu, 04 Dec 2008 03:26:19 +0000 http://wordpress.org/?v=2.1 By: Marvin http://www.wirevolution.com/2007/09/07/how-does-80211n-get-to-600mbps/#comment-687 Marvin Sun, 20 Jan 2008 19:01:18 +0000 http://www.wirevolution.com/2007/09/07/how-does-80211n-get-to-600mbps/#comment-687 So is every thing finalized at this point, and when can we expect to have access to hardware with these speed capibilities? So is every thing finalized at this point, and when can we expect to have access to hardware with these speed capibilities?

]]> By: Pavan Kulkarni http://www.wirevolution.com/2007/09/07/how-does-80211n-get-to-600mbps/#comment-694 Pavan Kulkarni Mon, 28 Jan 2008 14:58:06 +0000 http://www.wirevolution.com/2007/09/07/how-does-80211n-get-to-600mbps/#comment-694 Cant wait to get there!.. cant wait to see my office absolutely cableless! Cant wait to get there!.. cant wait to see my office absolutely cableless!

]]> By: Svi poslovi http://www.wirevolution.com/2007/09/07/how-does-80211n-get-to-600mbps/#comment-754 Svi poslovi Tue, 13 May 2008 11:15:31 +0000 http://www.wirevolution.com/2007/09/07/how-does-80211n-get-to-600mbps/#comment-754 What about the range? I don't need 600 Mb/s but I need to connect two computers which are not in the same buliding. On the other hand, there's less then 70m between those computers... What makes me think my attempt to connect them without wires would be a failure is a lot of concrete. What about the range? I don’t need 600 Mb/s but I need to connect two computers which are not in the same buliding. On the other hand, there’s less then 70m between those computers… What makes me think my attempt to connect them without wires would be a failure is a lot of concrete.

]]> By: Michael http://www.wirevolution.com/2007/09/07/how-does-80211n-get-to-600mbps/#comment-755 Michael Tue, 13 May 2008 14:23:10 +0000 http://www.wirevolution.com/2007/09/07/how-does-80211n-get-to-600mbps/#comment-755 Great question. 70 meters and a lot of concrete sounds very challenging. You can do it, of course, depending on your motivation and budget. It is possible that the MIMO feature of 802.11n could help, though your range is on the edge of what is doable without special measures. There is an interesting presentation <a href="https://mentor.ieee.org/802.11/file/07/11-07-2790-00-0vht-what-is-happening-in-60-ghz.ppt" rel="nofollow">here</a> that shows that multi-path can sometimes find a way through. Take a look at slide 10. Of course this presentation is about 60 GHz, but similar considerations may apply at 2.4 and at 5 GHz. Slide 4 shows that concrete is somewhat penetrable below 3 GHz. In your shoes, I would start with some experimenting. Consider getting two 802.11n access points (make sure the specifications mention MIMO and beam forming or beam steering) and plugging each into a computer (so two computers.) Set them to bridging mode in the same room and establish communication between them. Then move one of them to the other location and see if they can reach each other. This probably won't work. If you can put the access points near windows in each building, that would be the next step, then mounting antennas on external walls. Google for Wi-Fi, MIMO, concrete and similar keywords to see other peoples' experiences with this kind of issue. Great question. 70 meters and a lot of concrete sounds very challenging. You can do it, of course, depending on your motivation and budget.

It is possible that the MIMO feature of 802.11n could help, though your range is on the edge of what is doable without special measures. There is an interesting presentation here that shows that multi-path can sometimes find a way through. Take a look at slide 10. Of course this presentation is about 60 GHz, but similar considerations may apply at 2.4 and at 5 GHz. Slide 4 shows that concrete is somewhat penetrable below 3 GHz.

In your shoes, I would start with some experimenting. Consider getting two 802.11n access points (make sure the specifications mention MIMO and beam forming or beam steering) and plugging each into a computer (so two computers.) Set them to bridging mode in the same room and establish communication between them. Then move one of them to the other location and see if they can reach each other. This probably won’t work. If you can put the access points near windows in each building, that would be the next step, then mounting antennas on external walls. Google for Wi-Fi, MIMO, concrete and similar keywords to see other peoples’ experiences with this kind of issue.

]]> By: Svi Poslovi http://www.wirevolution.com/2007/09/07/how-does-80211n-get-to-600mbps/#comment-759 Svi Poslovi Fri, 30 May 2008 08:38:22 +0000 http://www.wirevolution.com/2007/09/07/how-does-80211n-get-to-600mbps/#comment-759 Thanks for a brief explanation and these advices, Michael. I've noticed further developments of N by IEEE are going to be minimized. Maybe I'll wait for the final 802.11n to be caught up by hardware industry. After all, slides you provided here were more than descriptive. I have to pass more than 50" of concrete walls and I wasn't even thinking about not being able to "shoot" perpendicularly... Was I optimistic or what? :-) I'll let you know if I dare to try in spite of reason. Thanks for a brief explanation and these advices, Michael. I’ve noticed further developments of N by IEEE are going to be minimized. Maybe I’ll wait for the final 802.11n to be caught up by hardware industry.

After all, slides you provided here were more than descriptive. I have to pass more than 50″ of concrete walls and I wasn’t even thinking about not being able to “shoot” perpendicularly… Was I optimistic or what? :-)

I’ll let you know if I dare to try in spite of reason.

]]> By: Bend in the Weather http://www.wirevolution.com/2007/09/07/how-does-80211n-get-to-600mbps/#comment-760 Bend in the Weather Fri, 30 May 2008 15:40:52 +0000 http://www.wirevolution.com/2007/09/07/how-does-80211n-get-to-600mbps/#comment-760 <strong>802.11n - The official delivery of pipe dreams...</strong> The IEEE's 802.11n standard is supposed to bring high speed wireless to the masses. It's been in draft longer than most can remember, and form the schedule it appears that it won't be out of draft releases and make it to a final specification until... 802.11n - The official delivery of pipe dreams…

The IEEE’s 802.11n standard is supposed to bring high speed wireless to the masses.
It’s been in draft longer than most can remember, and form the schedule it appears that it won’t be out of draft releases and make it to a final specification until…

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