The overlay of intelligent FDSS system on N-CDMA system

The capacity gain of a frequency diversity spread spectrum system (FDSS) overlaid on top of a narrowband code division multiplexing access (N-CDMA) system is estimated. The carrier to interference ratios (CIR) of both the FDSS and N-CDMA systems are evaluated. It is assumed that the base stations of both systems are unilocated and that the power control of the uplink and downlink of both systems is imperfect. The number of the FDSS users that can be overlaid on the N-CDMA system is 140 low bit rate users (9.6 kbit/sec.) or 11 data users (144 kbit/sec.).