Capacity and performance gains through temporal and spatial oversampling

In this work we present simulation results on the capacity and performance gains attainable by oversampling at the receiver in the temporal and spatial domains. The study assumes a downlink direct sequence code division multiple access (CDMA) system with a linear receiver. Oversampling in the temporal domain refers to sampling at a rate higher than the chip-rate. Oversampling in the spatial domain refers to multiple receiver antennas. The simulations results verify various aspects of our theoretical results including the dimensional resolution of inter-symbol interference (ISI) through spatial oversampling and the utilization of the bandwidth expansion for capacity gains through temporal oversampling. We quantify the performance gains by illustrating increases in system dimensionality and providing a bit error rate (BER) metric.