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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Low Complexity Hybrid Precoding Designs for Multiuser mmWave/THz Ultra Massive MIMO Systems.

João Pedro Pavia^1,2, Vasco Velez^1,2, Renato Ferreira^1,2

¹Department of Information Science and Technology, ISCTE-Instituto Universitário de Lisboa, 1649-026 Lisboa, Portugal.

Sensors (Basel, Switzerland)

|September 28, 2021

Summary

This summary is machine-generated.

This study introduces a hybrid analog/digital design algorithm for millimeter-wave and terahertz multiuser MIMO systems. The algorithm optimizes spectral efficiency and implementation complexity for ultra-massive MIMO, even with hardware constraints.

Keywords:

Terahertz (THz)antenna arrays hybrid precoding and combining millimeter wave (mmWave)multiuser ultra-massive-MIMO

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

Area of Science:

Wireless communication systems
Signal processing for wireless communications

Background:

Millimeter-wave (mmWave) and terahertz (THz) frequencies offer vast bandwidths for ultra-high-speed wireless connections.
High signal attenuation at these frequencies necessitates ultra-massive antenna arrays.
Hybrid analog/digital designs are crucial for managing complexity and power consumption in such systems.

Purpose of the Study:

To present a novel hybrid analog/digital design algorithm for mmWave and THz multiuser MIMO systems.
To enable efficient implementation of ultra-massive MIMO (UM-MIMO) in hardware-constrained THz systems.
To achieve a balance between spectral efficiency and implementation simplicity.

Main Methods:

A hybrid design algorithm with separate computation steps for digital precoder, analog precoder, and multiuser interference mitigation.
Adaptability to various analog architectures (phase shifters, switches, inverters, antenna selection).
Applicability to different system structures: fully-connected, arrays of subarrays (AoSA), and dynamic arrays of subarrays (DAoSA).

Main Results:

The proposed algorithm facilitates the support of UM-MIMO in THz systems.
Demonstrates the achievement of favorable trade-offs between spectral efficiency and implementation complexity.
Effective even with increasing numbers of users and data streams.

Conclusions:

The developed hybrid design algorithm is suitable for both mmWave and THz multiuser MIMO systems.
It offers a practical solution for implementing UM-MIMO in resource-limited THz environments.
The approach effectively balances performance and implementation efficiency for future wireless networks.