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Optimal DoF of the K-User Broadcast Channel with Delayed and Imperfect Current CSIT by de Kerret, Paul; Gesbert, David; Zhang, Jingjing; Elia, Petros is a scholarly article available to read on EtoBox.

What is Optimal DoF of the K-User Broadcast Channel with Delayed and Imperfect Current CSIT about?

This work studies the optimal Degrees-of-Freedom (DoF) of the $K$-User MISO Broadcast Channel (BC) with delayed Channel-State Information at the Transmitter (CSIT) and with additional current noisy CSIT where the current channel estimation error scales in~$P^{-\alpha}$ for $\alpha\in[0,1]$. This papers establishes for the first time the optimal DoF in this setting thanks to a new transmission scheme which achieves the elusive DoF-optimal combining of the Maddah-Ali and Tse scheme (MAT) introduced in their seminal work in $2010$ with Zero-Forcing (ZF) for an arbitrary number of users. The derived sum DoF takes the surprisingly simple form $(1-\alpha) K/H_K+\alpha K$ where $H_K\triangleq \sum_{k=1}^K \frac{1}{k}$ is the sum-DoF achieved using solely MAT.

Author

de Kerret, Paul; Gesbert, David; Zhang, Jingjing; Elia, Petros

Published

2016

Language

EN