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Post by principled on Mar 29, 2011 17:17:39 GMT 1
I understand that the current analogue TV frequencies will be sold off by the government for mobile usage (4G).
This means that the mobile Internet will 3 or 4 times faster.
My question is, what aspect of the new frequencies makes the speed of the Internet so much faster?
P
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Post by Progenitor A on Mar 29, 2011 20:07:03 GMT 1
I understand that the current analogue TV frequencies will be sold off by the government for mobile usage (4G). This means that the mobile Internet will 3 or 4 times faster. My question is, what aspect of the new frequencies makes the speed of the Internet so much faster? P Orthogonal Frequency Division Multiplexing. Simply, you are allocated a number of frequencoes (whcich are re-used by orthogonal polarisation) depending upon the instantaneous data speed demand that you require. The allocation is assymetric, with more frequencies allocated on the downlink (internet to user) than are allocated on the Uplink (user to the internet) Trouble is with 3G is that there is only one frequency per cell and if one user requires very fast internet acess, then other users cannot use that frequency |
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Post by principled on Mar 29, 2011 20:52:25 GMT 1
Thanks Nay
Is this the same idea that they use on satellite TV/radio signals where you have vertical and horizontal polarisation in each frequency?
P
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Post by Progenitor A on Mar 29, 2011 21:13:37 GMT 1
Thanks Nay Is this the same idea that they use on satellite TV/radio signals where you have vertical and horizontal polarisation in each frequency? P That is it! Well done! Could also be circular polarisation. cw and acw. Not forgetting spatial orthogonality of frequency due to highly directional antennas |
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