Erlang capacity of integrated-traffic CDMA systems

The development of personal communication and mobile computing stimulate the introduction of integrated traffic into mobile communications. CDMA is suitable for transmissions of integrated-traffic. In CDMA cellular systems all radio channels use the same frequency band and the same radio channel can be reused in all neighboring cells. The different code sequences are used for carrying different traffic channels. In CDMA systems, outage is said to occur when the total interference level reaches a predetermined level above the background noise level of mainly thermal origin. The capacity is defined as the maximum Erlang capacity that can be supported while limiting the probability of outage to below 1%. We extend the results of Wang Yan and Cheng Shixin (see Journal of China Institute of Communications, 1996) and Viterbi (see CDMA: Principle of Spread Spectrum Communication Addison-Wesley, 1995) to integrated-traffic systems.