An Offset-Canceling Approximate-DFT Beamforming Architecture for Wireless Transceivers

Zhao, Haixiang; Mandal, Soumyajit; Madanayake, Arjuna; Cintra, Renato J.

doi:10.1109/iscas.2018.8351765

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…An N -element uniformly-spaced linear antenna array can be used to realize an N -beam multi-beamformer by computing N -element discrete Fourier transforms (DFTs) along the spatial dimension. These computations can be efficiently performed using a spatial Fast Fourier transform (FFT), which can be implemented using both analog as well as digital approaches [88] and reduces the brute force computational complexity of the DFT from O(N 2 ) down to O(N log N ). Moreover, approximate versions of the DFT can be computed with even lower complexity than the FFT, as shown by Cintra, Bayer, and their collaborators [89]- [93].…”

Section: Novel Wideband Multi-beamformers At Low Size Weight Anmentioning

confidence: 99%

Wireless Communications and Applications Above 100 GHz: Opportunities and Challenges for 6G and Beyond

et al. 2019

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Frequencies from 100 GHz to 3 THz are promising bands for the next generation of wireless communication systems because of the wide swaths of unused and unexplored spectrum. These frequencies also offer the potential for revolutionary applications that will be made possible by new thinking, and advances in devices, circuits, software, signal processing, and systems. This paper describes many of the technical challenges and opportunities for wireless communication and sensing applications above 100 GHz, and presents a number of promising discoveries, novel approaches, and recent results that will aid in the development and implementation of the sixth generation (6G) of wireless networks, and beyond. This paper shows recent regulatory and standard body rulings that are anticipating wireless products and services above 100 GHz and illustrates the viability of wireless cognition, hyper-accurate position location, sensing, and imaging. This paper also presents approaches and results that show how long distance mobile communications will be supported to above 800 GHz since the antenna gains are able to overcome airinduced attenuation, and present methods that reduce the computational complexity and simplify the signal processing used in adaptive antenna arrays, by exploiting the Special Theory of Relativity to create a cone of silence in over-sampled antenna arrays that improve performance for digital phased array antennas. Also, new results that give insights into power efficient beam steering algorithms, and new propagation and partition loss models above 100 GHz are given, and promising imaging, array processing, and position location results are presented. The implementation of spatial consistency at THz frequencies, an important component of channel modeling that considers minute changes and correlations over space, is also discussed. This paper offers the first in-depth look at the vast applications of THz wireless products and applications and provides approaches for how to reduce power and increase performance across several problem domains, giving early evidence that THz techniques are compelling and available for future wireless communications. INDEX TERMS mmWave, millimeter wave, 5G, D-band, 6G, channel sounder, propagation measurements, Terahertz (THz), array processing, imaging, scattering theory, cone of silence, digital phased arrays, digital beamformer, signal processing for THz, position location, channel modeling, THz applications, wireless cognition, network offloading. I. INTRODUCTION The tremendous funding and research efforts invested in millimeter wave (mmWave) wireless communications, and The associate editor coordinating the review of this manuscript and approving it for publication was Thomas Kuerner. the early success of 5G trials and testbeds across the world, ensure that commercial widespread 5G wireless networks will be realized by 2020 [1]. The use of mmWave in 5G wireless communication will solve the spectrum shortage in current 4G cellular communication systems that operate

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Section: Novel Wideband Multi-beamformers At Low Size Weight Anmentioning

confidence: 99%

Wireless Communications and Applications Above 100 GHz: Opportunities and Challenges for 6G and Beyond

et al. 2019

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“…Thus, we designed the circuit shown in Fig. 4, which is an enhanced and modified version of the original DCM circuit [37], to realize the 1 : k DCCs required to implement the a-DFT. The main improvements include the use of cascode transistors to reduce systematic mismatch and the use of k successively-switched branches to generate k matched outputs.…”

Section: Dcm and Dynamic Current Copier (Dcc)mentioning

confidence: 99%

Analog Current-Mode 8-Point Approximate-DFT Multi-Beamformer With 4.7 Gbps Channel Capacity

et al. 2023

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This paper describes a current-mode on-chip analog architecture suitable for multibeamforming of IF band signals from small-to moderate-sized antenna arrays. The architecture uses an approximate discrete Fourier transform (a-DFT) to realize the linear transformation (LT) required for multibeamforming. Compared with the ideal DFT, the a-DFT algorithm exhibits good enough accuracy while only utilizing small integer coefficients, allowing it to be easily realized as a current-mode circuit. The 8-point a-DFT demonstrated in this paper can be used as the core calculation block in a standalone beamforming system and also serve as the key computational block in modularized multi-beamformer systems for larger arrays. The design uses an offset cancellation technique based on a multi-phase dynamic current mirror (DCM) to decrease errors in the generated beam pattern caused by transistor mismatches. The proposed integrated multi-beamformer was realized in the TSMC 180 nm process. Test results show that the chip can support 8-point multi-beamforming with 54 dB dynamic range (DR) and 4.7 Gbps channel capacity. The chip has approximately 40.8% lower power consumption than a fully-digital 8-point a-DFT core synthesized using the NCSU 45 nm PDK. When used within a complete beamforming system, the chip can also save system-level power consumed by the digital blocks, such as reducing ADC power consumption by 69.5% to 92.9% as estimated from the median Walden FoM of recent work.INDEX TERMS Analog beamforming, multi-beamformer, current-mode circuit, dynamic current mirror, analog computing.

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A Fast DVM Algorithm for Wideband Time-Delay Multi-Beam Beamformers

Perera

Lingsch

Madanayake

et al. 2022

IEEE Trans. Signal Process.

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An Offset-Canceling Approximate-DFT Beamforming Architecture for Wireless Transceivers

Cited by 3 publications

References 13 publications

Wireless Communications and Applications Above 100 GHz: Opportunities and Challenges for 6G and Beyond

Wireless Communications and Applications Above 100 GHz: Opportunities and Challenges for 6G and Beyond

Analog Current-Mode 8-Point Approximate-DFT Multi-Beamformer With 4.7 Gbps Channel Capacity

A Fast DVM Algorithm for Wideband Time-Delay Multi-Beam Beamformers

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