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Spread Spectrum Signaling: What's a Wide Band? |
| Section: NATURAL SCIENCE / IMPACTS |
| Author: Ruth Sellers |
| Publication: The world & I online |
| Issue Date: 4/1/2003 |
| Size: 600 Words, 3,825 Characters |
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Understanding spread spectrum requires looking deeper into the megahertz and kilohertz of conventional radio transmissions. One hertz is one cycle per second (1 cps), so one kilohertz is 1,000 cps and one megahertz is 1 million cps. The station at 92.3 on your FM dial broadcasts within a radio wave frequency band that extends 75 kHz (kilohertz) on either side of the carrier frequency of 92.3 MHz (megahertz).
The FM transmitter encodes content on the carrier frequency by...
. . .
...rum's ability to support numerous users on the same broad band. Spreading out the signal means that the power level at any one frequency is so low that it looks like noise to any receiver which lacks the specific code for despreading the signal. This is why the FCC can permit properly designed spread spectrum radios to operate without license. They can all share the same spectrum band.
----R.S.
(484 of 3,825 characters)
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