We consider the K-User Multiple-Input-Single- Output (MISO) Broadcast Channel (BC) where the transmitter, equipped with M antennas, serves K users, with K ≤ M. The transmitter has access to a partial channel state information of the users. This is modelled by letting the variance of the Channel State Information at the Transmitter (CSIT) error of user i scale as O(P−αi) for the Signal-to-Noise Ratio (SNR) P and some constant αi ≥ 0. In this work we derive the optimal Degrees-of- Freedom (DoF) region in such setting and we show that Rate- Splitting (RS) is the key scheme to achieve such a region.
- DoF region
- MISO BC
- Partial CSIT
ASJC Scopus subject areas
- Modelling and Simulation
- Computer Science Applications
- Electrical and Electronic Engineering