An iterative frequency-domain layered space-time receiver for SDMA systems with single-carrier transmission

The use of multiple antennas at the BS (base station) allows significant improvements on the spectral efficiency of wireless communication systems by increasing the number of simultaneous users in a given cell. We introduce a new iterative multiuser detection scheme for systems requiring high-rate transmission in severe time-dispersive channels. We consider the use of single-carrier modulation combined with frequency-domain equalization techniques, which are known to be excellent candidates for severe time-dispersive channels. The BS employs multiple antennas and consists of an iterative LST (layered space-time) receiver combined with frequency-domain equalization techniques. Our performance results show that the proposed receiver structure has excellent performance, which can be very close to the matched filter bound, even for severe time-dispersive channels and in the presence of strongly interfering channels.