Novel semi-adaptive ordered successive receivers for MIMO wireless systems

MIMO wireless systems are able to realize communication links with high spectral efficiency and high performance. By the transmission of different data streams at the same time and on the same frequency but from different transmit antennas, the spectral efficiency of MIMO systems can be increased linearly with the number of transmit antennas. However, to achieve such enormous spectral efficiencies, one of the major limitations is the complexity of the receiver that needs to separate several overlapped cochannel signals whose number increases with the number of transmit antennas. We investigate the performance of low complexity ordered successive MMSE receivers with realistic channel estimations. Generation of ing weights by both recursive and non-recursive approaches is studied. In order to compromise performance and complexity, novel ordered successive receivers where both approaches are combined are proposed. Those new receivers are named as semi-adaptive ordered successive receivers.