Unleashing the Potential of Beamspace Modulation in Near-Field MIMO: Opportunities and Challenges
Shuaishuai Guo, Kaiqian Qu, and Shuping Dang

TL;DR
This paper reviews the potential of beamspace modulation in near-field MIMO systems, highlighting opportunities for spectral efficiency improvements and discussing challenges in leveraging dynamic spatial degrees of freedom with limited RF chains.
Contribution
It provides a comprehensive review of near-field MIMO spatial DoF exploration and analyzes beamspace modulation as a promising technique to enhance system performance.
Findings
Beamspace modulation significantly improves spectral efficiency.
Near-field MIMO offers dynamic spatial degrees of freedom.
Implementation challenges include managing limited RF chains.
Abstract
The principal distinction in transitioning from far-field multiple-input multiple-output (MIMO) systems to near-field MIMO configurations lies in the notable augmentation of spatial degrees of freedom (DoF). This increase is not static;rather, it dynamically fluctuates in response to user mobility. A critical challenge emerges in effectively leveraging this significantly enhanced and continuously evolving spatial DoF, particularly when constrained by a limited and energy-intensive array of radio frequency (RF) chains. This article presents an exhaustive review of the current methodologies for exploring spatial DoF in MIMO systems, with a particular emphasis on the near-field context. Central to this review is the exploration of beamspace modulation, a technique that ingeniously capitalizes on the increased and dynamic spatial DoFs inherent in near-field MIMO systems. This strategic…
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Taxonomy
TopicsAdvanced MIMO Systems Optimization · Antenna Design and Analysis · Full-Duplex Wireless Communications
