CDMA schemes
Other CDMA schemes exist than what's described below. Wideband CDMA, utilizing 5Mhz channels and in many countries newly allocated spectrum, will allow advanced services to emerge and older services to continue. After a decade of denial, the most loyal proponents of TDMA (internal link, typical advocate), will soon admit defeat: CDMA has won. GSM is a fine system (internal link) but its capacity using TDMA is limited. As GSM moves to what's called 3GSM it will convert to CDMA. TDMA and its variants will exist for sometime, another decade possibly, but it is not the future of transmission technology. Although advanced, this is a fine paper on CDMA by Prasad and Ojanperäon. Please read if you want to know more:
http://www.comsoc.org/livepubs/surveys/public/4q98issue/prasad.html (external link)