Non-linear precoding for the downlink of FBMC/OQAM based multi-user MIMO systems

In this contribution, we present new progress on the design of non-linear precoding techniques for filter bank based multi-carrier with offset quadrature amplitude modulation (FBMC/OQAM) based multi-user multiple-input-multipleout (MIMO) downlink systems. The user terminals are allowed to have multiple antennas, and multi-stream transmissions for each user are enabled. First, the Tomlinson Harashima precoder (THP) based approach is generalized to such scenarios. Then, we discuss how to further adapt it to the case where the total number of receive antennas of the users exceeds the number of transmit antennas. An iterative THP scheme is devised such that the THP based non-linear precoding can be applied flexibly without suffering from the dimensionality constraint. The promising performance of the two non-linear precoding algorithms for FBMC/OQAM based multi-user MIMO downlink settings is demonstrated via numerical results.