Achievable DoF regions of MIMO networks with imperfect CSIT
File(s)
Accepted version
Author(s)
Hao, C
Rassoul, B
Clerckx, B
Type
Journal Article
Abstract
We focus on a two-receiver Multiple-Input-Multiple-
Output (MIMO) Broadcast Channel (BC) and Interference
Channel (IC) with an arbitrary number of antennas at each
node. We assume an imperfect knowledge of local Channel State
Information at the Transmitters, whose error decays with the
Signal-to-Noise-Ratio. With such configuration, we characterize
the achievable Degrees-of-Freedom (DoF) regions in both BC and
IC, by proposing a Rate-Splitting (RS) approach, which divides
each receiver’s message into a common part and a private part.
Compared to the RS scheme designed for the symmetric MIMO
case, the novelties of the proposed block lie in 1) delivering
additional non-ZF-precoded private symbols to the receiver with
the greater number of antennas, and 2) a Space-Time implemen-
tation. These features provide more flexibilities in balancing the
common-message-decodabilities at the two receivers, and fully
exploit asymmetric antenna arrays. Besides, in IC, we modify
the power allocation designed for the asymmetric BC based on
the signal space where the two transmitted signals interfere with
each other. We also derive an outer-bound for the DoF regions
and show that the proposed achievable DoF regions are optimal
under some antenna configurations and CSIT qualities.
Output (MIMO) Broadcast Channel (BC) and Interference
Channel (IC) with an arbitrary number of antennas at each
node. We assume an imperfect knowledge of local Channel State
Information at the Transmitters, whose error decays with the
Signal-to-Noise-Ratio. With such configuration, we characterize
the achievable Degrees-of-Freedom (DoF) regions in both BC and
IC, by proposing a Rate-Splitting (RS) approach, which divides
each receiver’s message into a common part and a private part.
Compared to the RS scheme designed for the symmetric MIMO
case, the novelties of the proposed block lie in 1) delivering
additional non-ZF-precoded private symbols to the receiver with
the greater number of antennas, and 2) a Space-Time implemen-
tation. These features provide more flexibilities in balancing the
common-message-decodabilities at the two receivers, and fully
exploit asymmetric antenna arrays. Besides, in IC, we modify
the power allocation designed for the asymmetric BC based on
the signal space where the two transmitted signals interfere with
each other. We also derive an outer-bound for the DoF regions
and show that the proposed achievable DoF regions are optimal
under some antenna configurations and CSIT qualities.
Date Issued
2017-08-03
Date Acceptance
2017-05-22
Citation
IEEE Transactions on Information Theory, 2017, 63 (10), pp.6587-6606
ISSN
1557-9654
Publisher
IEEE
Start Page
6587
End Page
6606
Journal / Book Title
IEEE Transactions on Information Theory
Volume
63
Issue
10
Copyright Statement
© 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Sponsor
Commission of the European Communities
Engineering & Physical Science Research Council (EPSRC)
Grant Number
318489 HARP
EP/N015312/1
Subjects
cs.IT
math.IT
0801 Artificial Intelligence And Image Processing
0906 Electrical And Electronic Engineering
1005 Communications Technologies
Publication Status
Published