Optimality of Simple Layered Superposition Coding in the 3 User MISO BC With Finite Precision CSIT | IEEE Journals & Magazine | IEEE Xplore

Optimality of Simple Layered Superposition Coding in the 3 User MISO BC With Finite Precision CSIT


Abstract:

We study the K = 3 user multiple input single output (MISO) broadcast channel (BC) with M = 3 antennas at the transmitter and 1 antenna at each receiver, from the general...Show More

Abstract:

We study the K = 3 user multiple input single output (MISO) broadcast channel (BC) with M = 3 antennas at the transmitter and 1 antenna at each receiver, from the generalized degrees of freedom (GDoF) perspective, under the assumption that the channel state information at the transmitter (CSIT) is limited to the finite precision. In particular, our goal is to identify a parameter regime where a simple layered superposition (SLS) coding scheme achieves the entire GDoF region. With αij representing the channel strength parameter for the link from the jth antenna of the transmitter to the jth receiver, we prove that the SLS is GDoF optimal without the need for time-sharing if max(αki, αim) ≤ αii and αki + αim ≤ αii + αkm for all i, k ∈ [3], m ∈ [M]. The GDoF region under this condition is a convex polyhedron. The result generalizes to arbitrary M ≥ 3.
Published in: IEEE Transactions on Information Theory ( Volume: 65, Issue: 11, November 2019)
Page(s): 7181 - 7207
Date of Publication: 05 July 2019

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