Design aspects and system evaluations of IS-95 based CDMA systems

The system performance of IS-95 based CDMA systems are studied in non-uniform and uniform traffic distributions in a uniform cell size. The three key elements in designing CDMA systems are pilot channel Ec/Io, forward traffic channel Eb/No and reverse traffic channel Eb/No. The CDMA system performance are evaluated in terms of capacity, soft handoff percentages, signal and interference power levels. Various simulations are conducted under hexagonal omni-cell configurations. The CDMA capacity will increase 17% when the propagation path-loss slope increases from 20 to 50 dB/decade. As orthogonality increases, the forward link capacity could increase by three times. Simulation shows that the number of simultaneous mobiles that the reverse link can support will increase from 27 to 36 when the loading in the surrounding cells is decreased by 50%. Commercially deployed CDMA systems demonstrate that the actual system performance matches well with the simulation prediction.