Overloaded Multiuser MISO Transmission with Imperfect CSIT
Enrico Piovano, Hamdi Joudeh, Bruno Clerckx
TL;DR
This paper proposes a novel transmission scheme for overloaded multiuser MISO broadcast channels with heterogeneous CSIT qualities, enabling non-orthogonal service to all users and demonstrating improved performance and optimal degrees of freedom.
Contribution
It introduces a superposition-based transmission strategy for overloaded MISO BC with mixed CSIT qualities, achieving enhanced performance and DoF optimality.
Findings
Enhanced performance over existing schemes
Achieves DoF optimality
Supports heterogeneous CSIT qualities
Abstract
A required feature for the next generation of wireless communication networks will be the capability to serve simultaneously a large number of devices with heterogeneous CSIT qualities and demands. In this paper, we consider the overloaded MISO BC with two groups of CSIT qualities. We propose a transmission scheme where degraded symbols are superimposed on top of spatially-multiplexed symbols. The developed strategy allows to serve all users in a non-orthogonal manner and the analysis shows an enhanced perfomance compared to existing schemes. Moreover, optimality in a DoF sense is shown.
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