  The constructive interference concept in the downlink of multiple-antenna
systems is addressed in this paper. The concept of the joint exploitation of
the channel state information (CSI) and data information (DI) is discussed.
Using symbol-level precoding, the interference between data streams is
transformed Under certain conditions into useful signal that can improve the
signal to interference noise ratio (SINR) of the downlink transmissions. In the
previous work, different constructive interference precoding techniques have
been proposed for the MPSK scenario. In this context, a novel constructive
interference precoding technique that tackles the transmit power minimization
(min-power) with individual SINR constraints at each user's receivers is
proposed assuming MQAM modulation. Extensive simulations are performed to
validate the proposed technique.
