Hybrid Terahertz Beamforming Relying on Channel Sparsity and Angular Orthogonality

As the next generation concepts gravitate towards ultra-high frequency bands, such as the terahertz (THz) band having abundant resources, approaching Tbps transmission rates is becoming a reality. In this contact we may exploit the sparsity of the THz channel, which substantially reduces the hardwar...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on vehicular technology 2024-04, Vol.73 (4), p.1-14
Main Authors: Yue, Qingdong, Hu, Jie, Shui, Tingyu, Huang, Qingxiao, Yang, Kun, Hanzo, Lajos
Format: Article
Language:English
Subjects:
Array signal processing
Asymptotic properties
Beamforming
channel sparsity
Closed form solutions
Delay effects
Downlink
Exact solutions
hybrid beamforming
Linear programming
low complexity
Millimeter wave communication
Orthogonality
Radio frequency
Sparsity
spatial orthogonality
Terahertz communication (THz)
Terahertz frequencies
Throughput
Transmitting antennas
Ultrahigh frequencies
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:As the next generation concepts gravitate towards ultra-high frequency bands, such as the terahertz (THz) band having abundant resources, approaching Tbps transmission rates is becoming a reality. In this contact we may exploit the sparsity of the THz channel, which substantially reduces the hardware complexity, since a single RF chain is capable of designing a nearoptimal transmit beamformer in a single-carrier single-user THz system. We then reveal the spatial orthogonality experienced in the down link of a single-carrier THz broadcast system supporting multiple users. The minimum throughput of the users is maximized by specifically designing the hybrid beamformer. Based on the above-mentioned angular orthogonality, we characterise the asymptotically optimal structure of the hybrid beamformer. Specifically, the asymptotically optimal analog beamformer is represented in closed-form, while its asymptotically optimal digital counterpart is formulated by solving a linear-programming problem. As a special example, the asymptotically optimal hybrid beamformer is also obtained in closed-form for a THz multicast system. Moreover, we obtain the closed-form asymptotically optimal hybrid beamformer of a multi-carrier multi-user system, when we maximize the minimum throughput among all the user. Our numerical results explicitly demonstrate the compelling benefits of our hybrid beamforming design.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2023.3332206