Performance Analysis of Oversaturated Group Orthogonal CDMA System in Multipath Channel

The method of increasing capacity of synchronous CDMA, called group orthogonal CDMA, is analyzed. When the number of users exceeds the signal space dimension the system becomes oversaturated. Previously designed oversaturated CDMA signatures are compared to conventional orthogonal signaling in multipath channel by computer simulations. Countermeasure to combat fading is to utilize zero forcing equalizer in the receiver. Results show that the energy loss due to larger number of active interferers in oversaturated system is for fading channels of the same order as for non-fading AWGN channel