Granted, there is an upper limit on spectral bandwidth.
The important thing to read in that article ( imho) is:
William Kennard warned that the success of wireless communications, and wireless Internet services in particular, could be the technology's biggest challenge unless industry players do a better job of sharing and managing the world's limited supply of radio spectrum.
I.e. he is tellingthe manufacturers to work together, not to engage in an anarchic proprietary wireless connection free-for-all (which frankly, can be read as an "output" from the New Orleans wireless 2000 conference). Further, given his role at the FCC, I would think he is sending a "Be disciplined, it's in your best interest" signal.
If you read up on WIN's w-ofdm, and on ieee 802.11a and 802.16 you will see that exactly this is happening, coherent bandwidth maximizing standards are evolving rapidly.
Indeed, if you read the fine print on w-ofdm you will see that the technology "scales" to the bandwidth demands of the point to point and point to multipoint IP connections that are layered on top of it.
While it is all here : wi-lan.com
probably htis is the best summarization :
OFDM technology breaks one high-speed data signal into tens or hundreds of lower speed signals, which are all transmitted in parallel. This creates a system highly tolerant to noise and multipath and, at the same time, is very efficient in its use of bandwidth. Noise and multipath immunity allow for wide-area, multipoint coverage, and the efficient use of bandwidth allows for many more high-speed channels within a frequency band. Therefore, the main difficulties in narrow band and spread spectrum are overcome by OFDM.
And:
The efficiency and noise tolerance of
W-OFDM allow the best of both spread-spectrum and narrow band systems to be united. This combination, and our established data networking protocols, further extend the
capabilities of W-OFDM into realm of practical multipoint networks.
W-OFDM allows low power, multipoint RF networks to be implemented that minimize their interference with adjacent networks. W-OFDM is also insensitive to noise and multipath
interference, so ongoing tuning, adjustments and maintenance requirements are reduced. W-OFDM effectively permits several independent channels to operate within the same
band, allowing multipoint networks and point-to-point backbone systems to be overlaid on one another in the same frequency band.
Less disruption of adjacent users and insensitivity to external noise means that high-speed multipoint data networks can be simply and rapidly deployed. Once installed, these systems are tolerant to changes in the RF environment, limiting maintenance requirements, and the systems can be easily expanded to meet the users changing needs. |
