Abstract
The future digital systems for personal communications have now been partially standardised, so it is possible to get a good idea of the exposure power levels and time variation of the power, which may be assumed to be the two biologically relevant parameters. Using GSM and the coming UMTS system the relevant details are discussed, where the main difference is between the highly periodic TDMA (Time Division Multiple Access) power variation and the more smooth, slowly varying CDMA signal (Code Division Multiple Access). Epidemiological and biological studies must reflect the intricate details of the various systems.
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