Location-dependent downlink capacity loss due to introducing a high data-rate user in CDMA cellular systems with multiple low data-rate users

摘要

Existing code division multiple access(CDMA) cellular systems achieve capacity gains over conventional time division multiple access(TDMA)or frequency division multi- ple access(FDMA)systems, by assuming a large number of low data-rate and hence low power users uniformly distributed over a cell. In current CDMA proposals for providing higher data-rate packet services, however, burst high data-rate users do not satisfy this assumption and thus the capacity advantage is lost. In this letter, we quantify the capacity loss with focusing on location- dependent aspects of the degradation.