CDMA CELLULAR-SYSTEMS PERFORMANCE WITH FADING, SHADOWING, AND IMPERFECT POWER-CONTROL

This paper addresses capacity estimation for cellular code-division mu ltiple-access (CDMA) systems, assuming the IS-95 standard as a referen ce, Extending the analytical method from [6], we obtain a sequence of bounds on capacity, and then we introduce an accurate approximation to reduce computation complexity. The analysis accounts for interference internal and external to the reference cell, fading, shadowing, and i mperfect power control. Outage probability is expressed in terms of th e characteristic functions (cf's) of the interference and imperfect po wer control random variables (rv's), The interference contributions ar e computed on the basis of a Poisson distribution for the number of us ers in a lognormally shadowed channel. Results are provided for differ ent channel conditions and are validated against Monte Carlo simulatio ns, A comparison against previously published CDMA capacity estimates is carried out, aimed at clarifying some controversial issues. It is a lso confirmed that large system capacity is achievable under tight pow er control.