ADAPTIVE CSI SHARING MECHANISM FOR D2D ENABLED PRECODING IN MASSIVE MIMO

摘要

The present invention relates to a user equipment device and method for adaptively sharing channel state information and setting a distributed precoding in a multi-input multi-output system over a device-to-device communication. A plurality of user equipment devices shares the channel state information statistics with each other and cooperatively design individual channel codebooks and precoder codebooks for the device-to-device channel state information exchange. A respective precoder can then be computed and selected from the respective precoder codebook in order to maximize the signal-to-leakage-and-noise ratio. Only the portion of channel state information lying in the overlapping signal subspace is shared with each user equipment device and the shared portion of channel state information is quantized up to a resolution adaptive to the global channel state information statistics and the device-to-device signaling capacity.