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WiMax Technology Could Blanket the US?
obiwan2u writes "According to an article on WiMaxTrends, the metropolitan area wireless networking technology (MLAN) called WiMax could reach 90% of the mainland US population if about $3 billion was spent on infrastructure. The 802.16 standard specifies a max range of about 30 miles and a max speed of about 70 Mbits/sec, but typical ranges and speeds will typically be smaller. 802.16/WiMax specifies various licensed (3.5Ghz) and unlicensed (5Ghz) frequency ranges but the unlicensed ranges have Wi-Fi like transmitting power restrictions. More background on this technology can be seen at: WiMax starting to make its move and 802.16: Medium distance wireless networking that could change the world?"
That means with many users, each user could end up with dial-up speeds. Correct?
We have to take this article with a grain of salt. First off, the article is put out by WiMax Trends. Of course they're going to say that. It's like Microsoft saying they rock and the world depends on their software. Second, there are a lot of trends that COULD happen...broadband over powerlines for example. While this is a rather cool wireless application, let's not all be getting all giddy just yet.
"He uses statistics as a drunken man uses lampposts...for support rather than illumination." - Andrew Lang
I think "slowly" is the key word here. I don't know about you, but I don't plan to avoid encryption for the next half century because it's theoretically possible to build some sort of computer to crack it.
:)
I think the "worry" here is all of the anti-RF nuts protesting this. Not that I think they could stop implementation, however, but they'll try
"Well, then fire it up and show me what this..." (sigh)
Screw Iraq, or a tax cut, or whatever bullshit subsidy the government wants to spend my money on- we should have this. Now! A $3bn investment in a free, public, high-speed wireless internet infrastructure would repay itself by stimulating all sorts of economic growth in a very short amount of time. Naturally, that means it'll never happen... It'll only get built by a large corporation that will charge us out the asses for it and provide spotty service. Woohoo! Maybe the EU'll do it... It'll certainly benefit places that are further behind in their infrastructure by helping them get past the last mile problem...
LMDS and MMDS never managed to solve the propagation problem. Tree leaves are amazingly good at stopping high frequency RF signals--they hold a lot of water during the spring and summer months. WiMAX for all its great technology does not have an answer for this. In fact it is likely to face MORE propagation problems than earlier fixed wireless attempts because it operates at much higher frequencies.
Yes, WiMAX has OFDM, which is great for urban environments because it handles multipath (bounces) well. But trees don't bounce; they absorb.
WiMAX will certainly find success in many environments. Urban is one. Desert is another (American southwest). Far north is another. Many of the currently profitable fixed wireless installations are in the desert or far north, where there is little tall vegetation to eat the signal.
But in places like rural or suburban Mid-Atlantic, southeast, and New England--places with a lot of deciduous trees--expect the ranges and speeds to be far below predicted, with service "shadows" depending on your exact location.