Overlay of CDMA2000 on IS-136

The forward and reverse link capacities of CDMA2000 and IS-136 are evaluated when they are overlaid. It is assumed that IS-136 support mainly voice services and that CDMA2000 support different services with different rates and quality requirements. Multicode and variable processing gain are studied. Moreover, as CDMA2000 can use 1.25 MHz and 5 MHz of dispersion bandwidth in the 25 MHz cellular bandwidth it is possible to have 20 and 5 frequency allocations with different reuse patterns as in FDMA and TDMA cellular systems. This idea allows us to have very high capacity in the CDMA system with the installation of less equipment in comparison with the universal frequency reuse.