Space-Time-DFE for Adaptive Array Antennas in 4G WirelessCommunications

The feasibility of a space-time decision feedback equalizer applied to the uplink of a 12.8 Mbit/s QPSK-system is demonstrated by means of link and system level simulations of real-world-like propagation and cell scenarios. Even for small antenna arrays of only 4 sensors an SDMA gain of 67% is achieved, i.e. 5 users per cell may be loaded to only 3 carrier frequencies. For scenarios with omnidirectional coverage, uniform circular arrays present better performance than uniform linear arrays.