@acbot -- Australian politicians are stupid enough already without feeding them this gobbledygook!
Sounds as if you are an anti-National Broadband Network (NBN fibre) punter who's looking for any 'evidence' and anything's OK to feed politicians who wouldn't know facts from crap anyway.
It's 04:30 or thereabouts here and half of my neurons have already closed down for the night but there's enough awake to know that this is (a) huge misrepresentation/oversimplification of a much more technical document, and/or propaganda concocted specifically to mislead/deceive and produce even more FUD in the light of the current NBN controversy, or it's written by a non technical person who has hardly a grasp on the subject.
I'll reread the doc again in the cool light of day just to be sure. However, irrespective of unscientific BS, mumbo-jumbo and political ideology, physics is still physics and it doesn't change its spots for anyone--not even marketing types, spin doctors or politicians.
Facts are facts and here's a few:
1. Shannon's Law applies to any channel no matter how it's disguised, re-badged or what colour it's painted.
2. Repackaging of channels, bundling of them or sending them across different mediums is permitted but Shannon still applies:
3. Restated, this means YOU CAN'T GET SOMETHING FOR NOTHING. IF THE AVAILABLE BANDWIDTH IS INSUFFICIENT FOR A GIVEN DATA STREAM/CHANNEL THEN IT WILL NOT FIT. CODING THEORY SAYS THIS. You either slow the data rate down to suit or you increase the available bandwidth (or, if inefficient, improve the coding/modulation).
4. Modulation systems/schema are not all the same. Just because some encoding schemes are common, it doesn't mean that they are efficient. AM and FM radio use coding schemes that are inefficient, especially so for FM. This means that the same info if coded with a more efficient coding scheme could be fitted into a narrower broadcast channel without losing any info of suffering any loss of signal-to-noise ratio.
5. The same physics applies to Wireless Internet channels as it does to those of radio or TV broadcasting. The difference is that the type of info carried and the efficiencies of the coding (modulation) are different. Newer schemes usually make better use of the available bandwidth but the fundamental rules remain identical. Better encoding allows more info to fit down a channel of a given bandwidth.
6. Newer and better encoding techniques are now possible because of cheap electronics, fast microprocessors etc.
7. In recent years, encoding techniques have been getting better. Nevertheless, Shannon still applies. We are now at a point where squeezing more data through a given bandwidth has just about reached the point of diminishing returns (the Shannon limit).
8. An example of the point of diminishing returns is the 56k dial-up modem. They're now ancient and we've still not seen faster ones of this kind. Simply, getting more info onto an audio telephone line has just about reached its upper limit with this technology (theoretically and practically and so into the future).
9. BEFORE YOU EVEN DREAM OF MENTIONING IT, DSL/ADSL DOES NOT CHANGE THOSE RULES, THEORY AND SHANNON ARE STILL INTACT. 56k modems work WITHIN the audio bandwidth of a standard POTS telephone line whereas DSL/ADSL does not. Like the radio spectrum but to a very much lesser extent, copper telephone lines are capable of carrying channels that use different encoding techniques. The traditional telephone audio consists of a baseband around 300Hz to 3kHz whereas ADSL uses an encoded carrier technology in a similar way a radio station does. Moreover, for various reasons too detailed to mention here, DSL/ADSL is a fudge or kludge, it only works up to about 5km from the exchange whereas the baseband telephone can work 10 perhaps even 100 times that distance. Essentially, the granularity of POTS versus DSL are totally different. In communication terms, we're not comparing apples with apples but with oranges.
10. The same analogies can be applied to wireless. The radio spectrum is capable of carrying any type of encoding--from 10 words-per-minute Morse Code to huge data rates of satellite links etc.--simply, the spectrum is blind to coding techniques.
11. Just because the spectrum is blind to coding techniques it doesn't mean that all spectrum is the same. Higher carrier frequencies are best suited to wide bandwidth channels because there's more spectrum to fit channels within. However, in practice the higher the frequency and the wider the bandwidth the shorter the circuit distance.
12. Existing radio schemas (bandplans) are not perfect and can be improved. Whether DIDO actually does this or not, or whether it's cost effective to do so is unclear as there's no proper engineering data available to us. Mumbo-jumbo will not suffice here, only quantitative specs will do that.
13. The PDF article is extremely sloppy in its nomenclature and terminology. Cellular radio technology (a) reuses the same frequencies repeatedly, (b) where channels are doubled up, wireless devices can slide along to other clear channels, and (c) wireless today uses spread spectrum techniques. Oversimplifying somewhat, this technique allows cell phones to share the same channels but to simultaneously interleave themselves with each other so there's little or no mutual (same/co-channel) interference.
14. There are many ways of packing more channels into a given amount of spectrum but such schemas are not infinitely extensible. Interference, cross-modulation and Shannon's Law guarantee that it's not. In this respect, the PDF article makes outrageous, unjustifiable claims that border on something that a charlatan would write.
15. The ionosphere is a very useful physical phenomenon, but it's a very unpredictable one. Channel (bandwidth) availability is very restricted, path/skip distance cannot be relied upon and fade and noise margins are highly problematic issues. Heavens knows how it would be properly integrated into the proposed schema (we've over 100 years experience of using the ionosphere for communications and these issues are extremely well known).
It seems to me that most of the protagonists in this argument need to get out of the way and let experienced radio engineers set parameters and devise new systems.
An elementary course in radio theory for most rest of you would do much to cut the speculative and unjustifiable claims--most of which seem to be more in keeping with science fiction than having any basis in physical reality.