Erlang capacity of a CDMA system using optimized sectoring

We evaluate the Erlang capacity of CDMA systems according to two sector operation methods; the optimized sectoring and the fixed angle sectoring. For the performance analysis, a multi-dimensional Markov channel model is developed. The improved Erlang capacity through optimized sectoring is quantified over the fixed angle sectoring. As a result, we can get about 20% capacity improvement for the optimized sectoring over the fixed angle sectoring under the uniform traffic distribution among sectors. In addition, the optimized sectoring provides a constant Erlang capacity improvement (about 3.6 times) over an omnidirectional case even when traffic loads among sectors are non-uniformly distributed. On the other hand, the fixed angle sectoring results in the actual capacity improvement between 1.8 to 3 over an omni-directional case, depending on the traffic distribution among sectors.