Mimo Detection and Precoding

Multiple-input multiple-output (MIMO) techniques are the fundamental technology in several standardizations including long-term evolution (LTE) and LTE-advanced. For instance MIMO spatial multiplexing (MIMO-SM) is used to increase the system capacity without requiring additional time/frequency resources. However the performance of the MIMO-SM depends on the employed detection algorithm. Also multi-user MIMO precoding at the transmitter part is used to support the simultaneous transmission to several users. In this book we review the basics of MIMO detection. Then we introduce two detection algorithms namely adaptive parallel QRDM algorithm (APQRDM) that increases the detection throughput and adaptive iterative QRD-M algorithm (AIQRDM) that reduces the hardware requirements. Besides these two algorithms adaptively reduce the computational complexity while achieving the optimum diversity. Furthermore in addition to introducing the state of the art of the precoding techniques we propose a fixed complexity sphere encoder (FSE) that requires a fraction of the computations performed by the QRDM encoder while achieving a tremendous increase in the precoding throughput.