Closed-Form Expressions for Other-Cell Interference in Cellular CDMA
Philip J. Fleming, Burt Simon, Alexander Stolyar · 1997
We investigate the ratio of other-cell interference to in-cell interference in cellular CDMA. This ratio appears in expressions for the capacity of the system when are distributed as a (spatial) Poisson process (as in [2]), but must be evaluated by numerical integration when the positions of the are fixed (e.g. a hexagonal grid). Our model is identical to [2] except that we distribute both the mobiles and base stations as Poisson processes. Each mobile is power controlled by the best base station (least signal attenuation) of the N closest base stations. We present closed form expressions when N = 1,2 and infinity which are very simple when N = 1 and infinity. We argue that the performance (system capacity) predicted by our model is pessimistic since a real system has a more regular arrangement of base stations than a typical Poisson process. However, our simple closed-form expressions yield values that do not differ significantly from the (optimistic) values found in [1], where a regular hexagonal arrangement of base stations is assumed.