Codebook Design for Composite Beamforming in Next-generation mmWave Systems | IEEE Conference Publication | IEEE Xplore

Codebook Design for Composite Beamforming in Next-generation mmWave Systems


Abstract:

In pursuance of the unused spectrum in higher frequencies, millimeter wave (mmWave) bands have a pivotal role. However, the high path-loss and poor scattering associated ...Show More

Abstract:

In pursuance of the unused spectrum in higher frequencies, millimeter wave (mmWave) bands have a pivotal role. However, the high path-loss and poor scattering associated with mmWave communications highlight the necessity of employing effective beamforming techniques. In order to efficiently search for the beam to serve a user and to jointly serve multiple users it is often required to use a composite beam which consists of multiple disjoint lobes. A composite beam covers multiple desired angular coverage intervals (ACIs) and ideally has maximum and uniform gain (smoothness) within each desired ACI, negligible gain (leakage) outside the desired ACIs, and sharp edges. We propose an algorithm for designing such ideal composite codebook by providing an analytical closed-form solution with low computational complexity. There is a fundamental trade-off between the gain, leakage and smoothness of the beams. Our design allows to achieve different values in such trade-off based on changing the design parameters. We highlight the shortcomings of the uniform linear arrays (ULAs) in building arbitrary composite beams. Consequently, we use a recently introduced twin-ULA (TULA) antenna structure to effectively resolve these inefficiencies. Numerical results are used to validate the theoretical findings.
Date of Conference: 10-13 April 2022
Date Added to IEEE Xplore: 16 May 2022
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Conference Location: Austin, TX, USA

I. Introduction

With the exponential growth in the number of users and the diversity of the broadband applications in next-generation communication systems, the ever-increasing need to explore higher bandwidths, reveals the pivotal role of mmWave communications in future wireless networks. However, given the high path-loss and poor scattering associated with mmWave communications, effective beamforming techniques integrating a large number of antennas are required to ensure satisfactory quality of service (QoS).

References

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