1 Intro

In the early nineties, GSM was deployed in many European countries. Global System for Mobile communication (GSM) offered for the first time international roaming for mobile subscribers. The GSM’s use of Time Division Multiple Access (TDMA) as its communication standard was debated at length. And every now and then there are big discussion whether Code Division Multiple Access (CDMA) should have been chosen over TDMA.

If you want to know more about Global System for Mobile communication (GSM), Time Division Multiple Access (TDMA), Code Division Multiple Access (CDMA) and other acronyms (oa), just read a book about mobile communication.

1.1 Some chemistry and physics

Nicotinamide Adenine Dinucleotide (NAD^{+}) is a major electron acceptor in the oxidation of fuel molecules. The reactive part of NAD^{+} is its nictinamide ring, a pyridine derivate.

One mol consists of N_{A} atoms or molecules. There is a relation between the constant of Boltzmann and the Number of Avogadro:

k = R/N_{A}  (1)

2 Acronyms

GSM Global System for Mobile communication. GSM is the new standard for digital cellular communication in Europe.

TDMA Time Division Multiple Access. Some would say, that this is not as good as CDMA.

CDMA Code Division Multiple Access. The spread spectrum modulation used in the Qualcomm system.

NAD^{+} Nicotinamide Adenine Dinucleotide.

N_{A} Number of Avogadro: N_{A} = 6.022045 · 10^{23} mol^{−1}