Code-division multiplexing

Code-Division Multiplexing Technique that creates multiple channels from one physical channel by using code keys to create the channels. 

Figure 3(b) Spread spectrum wireless techniques a diagrammatic representation of a code division multiplex utilizing wideband approaches. There are many variations of CDMA, differing in the lime window size employed, application of the pseudo-random number code involved, and power used. The example uses a wideband source with a signal/noise ratio near unity. Theoretically this increases the number of users in an area since close-by transmitters do not overload receivers, masking the desired source... 

Code division multiple access (CDMA) A multiplexing technique where the signal intelligence is mixed with a randomlike code and then spread over a wide range of frequencies. 

The development of the GMS likewise built on US technology and on concepts from German and French telecommunications equipment firms, but to a lesser extent from Scandinavian firms. The time division multiplexing method (TDMA) used for GSM was first proposed by P.S. Henry, a scientist at Bell labs, and published in 1981 (Millman 1984, p. 237). The speech coding 29 qSM was... 

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