Pseudo MIMO (pMIMO): An Energy and Spectral Efficient MIMO-OFDM System
arxiv(2024)
摘要
This article introduces an energy and spectral efficient multiple-input
multiple-output orthogonal frequency division multiplexing (MIMO-OFDM)
transmission scheme designed for the future sixth generation (6G) wireless
communication networks. The approach involves connecting each receiving radio
frequency (RF) chain with multiple antenna elements and conducting sample-level
adjustments for receiving beamforming patterns. The proposed system
architecture and the dedicated signal processing methods enable the scheme to
transmit a bigger number of parallel data streams than the number of receiving
RF chains, achieving a spectral efficiency performance close to that of a fully
digital (FD) MIMO system with the same number of antenna elements, each
equipped with an RF chain. We refer to this system as a ”pseudo MIMO” system
due to its ability to mimic the functionality of additional invisible RF
chains. The article begins with introducing the underlying principles of pseudo
MIMO and discussing potential hardware architectures for its implementation. We
then highlight several advantages of integrating pseudo MIMO into
next-generation wireless networks. To demonstrate the superiority of our
proposed pseudo MIMO transmission scheme to conventional MIMO systems,
simulation results are presented. Additionally, we validate the feasibility of
this new scheme by building the first pseudo MIMO prototype. Furthermore, we
present some key challenges and outline potential directions for future
research.
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