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Re: Nokia 6010 Reporting in to Mama -- Radio Interference?

Michael D. Sullivan (userid@camsul.example.invalid)
Mon, 07 Mar 2005 04:46:41 GMT

In article <telecom24.97.11@telecom-digest.org>,
kd1s@nospamplease.cox.reallynospam.net says:

>> True. I was told by a contact at ETSI (the organisation that defined
>> many of the GSM standards) that this was originally an oversight --
>> they had not realised that the modulation scheme was effectively 100%
>> amplitude modulation, which would be "detected" by any rectifying
>> circuit nearby. It caused a lot of consternation in the early days.

>> The "solution" they eventually agreed was to reduce the power
>> transmitted by the phones by a factor of 10. This had been proposed
>> anyway, to reduce the cell size and hence increase system capacity
>> (also to increase battery life).

> So GSM that we have today is a patch on top a patch. Nice to think about
> that.

But the 3G migration path for GSM is UMTS, also known as W-CDMA. It
does not use time division multiplexing; instead it uses a version of
CDMA that occupies 5 MHz down- and upstream (as opposed to cdma2000,
EV- DO, etc., which use 1.25 MHz down- and upstream per channel).
Thus, eventually the buzzing side-effect of GSM will disappear.

-- 
Michael D. Sullivan
Bethesda, MD, USA
Replace "example.invalid" with ".com".

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