Updated: 11/24/2005; 11:28:43 PM.

General networking
Data network connectivity developments, networking business news, and related computing items.


daily link  Monday, October 20, 2003


The End of Spectrum: "There are two basic problems with the rules governing the radio spectrum: there is no such thing as spectrum, and we don't need any rules." 

Nice technical summary, listing spectrum sharing methods other than frequency division: "Wireless technology has come a long way since Marconi's day. For example, many systems now use spread-spectrum as an alternative to frequency division. WiFi and CDMA cellular networks are two examples. In both cases, devices share the "same" frequencies, using computational intelligence to distinguish one signal from another. The ultimate form of spread-spectrum is ultra-wideband (UWB). UWB systems can transmit at extremely low power, so low that they appear invisible to licensed systems operating in the same bands. ..  Other novel forms of wireless sharing include angle-of-arrival (for example, distinguishing a satellite transmission coming from overhead and a terrestrial wireless signal moving horizontally); mesh networking (relaying signals from other users); and cognitive radio (sensing the environment to find temporarily open "holes," and moving out of the way once another signal appears)."

  10:25:23 PM  permalink  

 
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Copyright 2005 © Ken Novak.
Last update: 11/24/2005; 11:28:43 PM.