Can Continuous Aperture MIMO Achieve Much Better Performance than Discrete MIMO?

  title={Can Continuous Aperture MIMO Achieve Much Better Performance than Discrete MIMO?},
  author={Zhongzhichao Wan and Jieao Zhu and Linglong Dai},
—The concept of continuous-aperture multiple- input multiple-output (CAP-MIMO) technology has been proposed recently, which aims at achieving high spectrum density by deploying extremely dense antennas or even continuous antennas in a given aperture. The fundamental question of CAP-MIMO is whether it can achieve much better performance than the traditional discrete MIMO system. In this paper, to model the CAP-MIMO, we use self-adjoint operators to depict the structural characteristics of the… 

Figures from this paper

Fundamental Limits of Holographic MIMO Channels: Tackling Non-Separable Transceiver Correlation

Holographic MIMO communication was proposed to sufficiently exploit the propagation characteristics of electromagnetic channels and boost the channel capacity. Unfortunately, the application of the

An Overview of Massive MIMO: Benefits and Challenges

This paper addresses the potential impact of pilot contamination caused by the use of non-orthogonal pilot sequences by users in adjacent cells, and analyzes the energy efficiency and degrees of freedom provided by massive MIMO systems to enable efficient single-carrier transmission.

Beam Focusing for Near-Field Multi-User MIMO Communications

The designed focused beams provide a new degree of freedom to mitigate interference in both angle and distance domains, which is not achievable using conventional far-field beam steering, allowing reliable communications for uses even residing at the same angular direction.

Channel Modeling and Channel Estimation for Holographic Massive MIMO With Planar Arrays

Novel channel estimation schemes that exploit the array geometry to identify a subspace of reduced rank that covers the eigenspace of any spatial correlation matrix are proposed.

Spatially-Stationary Model for Holographic MIMO Small-Scale Fading

This paper considers the small-scale fading in the far-field, and model it as a zero-mean, spatially-stationary, and correlated Gaussian scalar random field, and develops a discrete representation for the field as a Fourier plane-wave series expansion.

Wavenumber-Division Multiplexing in Line-of-Sight Holographic MIMO Communications

It is proved that the interference-free condition can only be achieved when the receiver size grows to infinity, and the spectral efficiency of WDM is evaluated via the singular-value decomposition architecture with waterfilling and compared to that of a simplified architecture, which uses linear processing at the receiver and suboptimal power allocation.

Principal Component Analysis-Based Broadband Hybrid Precoding for Millimeter-Wave Massive MIMO Systems

A principal component analysis (PCA)-based broadband hybrid precoder/combiner design, where both the fully-connected array and partially-connected subarray (including the fixed and adaptive subarrays) are investigated, and the near-optimality of the proposed PCA approach is theoretically proven.

Degrees of freedom in multiple-antenna channels: a signal space approach

The commonly used statistical multiple-input multiple-output (MIMO) model is inadequate and antenna theory is applied to take into account the area and geometry constraints, and to define the spatial signal space so to interpret experimental channel measurements in an array-independent but manageable description of the physical environment.

Communication Modes With Large Intelligent Surfaces in the Near Field

Numerical results show that quasi-optimal communication can be obtained starting from focusing functions, with the possibility of a significant enhancement of the channel capacity even in line-of-sight channel condition, without the need of implementing optimal but complex phase/amplitude profiles on transmitting/receiving antennas as well as resorts to intensive numerical solutions.

Fourier Plane-Wave Series Expansion for Holographic MIMO Communications

This paper provides a Fourier plane-wave series expansion of the channel response, which fully captures the essence of electromagnetic propagation in arbitrary scattering and is also valid in the (radiative) near-field.

Mutual Information for Electromagnetic Information Theory Based on Random Fields

An ideal model with infinite-length source and destination which shows a strong correpsondence with the time-domain model in classical information theory is built.