A 6-GHz MU-MIMO Eight-Element Direct Digital Beamforming TX Utilizing FIR H-Bridge DAC

Zheng, Boyi; Lü, Jie; Flynn, Michael P.

doi:10.1109/tmtt.2021.3064318

Cited by 8 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Three main categories of beamforming technology have been investigated in the literature: digital (adaptive), analog (switched), and hybrid beamformer. In digital beamforming, one dedicated RF chain per antenna element is required [18,19]. On the other hand, various hardware components are required in large-scale antennas to enable digital beamforming, including mixers, power amplifiers, and digital-to-analog and analog-to-digital converters.…”

Section: Introductionmentioning

confidence: 99%

Design of Hybrid Beamforming System Based on Practical Circuit Parameter of 6-Bit Millimeter-Wave Phase Shifters

et al. 2023

View full text Add to dashboard Cite

This paper addresses the design of a hybrid beamforming system considering the circuit parameter of six-bit millimeter-wave phase shifters based on the process design kit. The phase shifter design adopts 45 nm CMOS silicon on insulator (SOI) technology at 28-GHz. Various circuit topologies are utilized, and in particular, a design is presented based on switched LC components, connected in a cascode manner. The phase shifter configuration is connected in a cascading manner to get the 6-bit phase controls. Six different phase shifters are obtained, which are 180°, 90°, 45°, 22.5°, 11.25°, and 5.6°, with a minimum number of LC components. The circuit parameters of the designed phase shifters are then incorporated in a simulation model of hybrid beamforming for a multiuser MIMO system. The number of OFDM data symbols used in the simulation is ten for eight users, 16 QAM modulation schemes, −25 dB SNR, 120 simulation runs, and around 170 h runtime. Simulation results are obtained considering four and eight users, assuming accurate technology-based models of RFIC components of the phase shifter as well as ideal phase shifter parameters. The results indicate that the performance of the multiuser MIMO system is affected by the accuracy level of the phase shifter RF component models. The outcomes also reveal the performance tradeoff based on user data streams and the number of BS antennas. By optimizing the amount of parallel data streams per user, higher data transmission rates are achieved, while maintaining acceptable error vector magnitude (EVM) values. In addition, stochastic analysis is conducted to investigate the distribution of the RMS EVM. The outcomes show that the best fitting of RMS EVM distribution of the actual and ideal phase shifters agreed with the log-logistic and logistic distributions, respectively. The obtained (mean, variance) values of the actual phase shifters based on accurate library models are (46.997, 481.36), and for ideal components the values are (36.47, 10.44).

show abstract

Section: Introductionmentioning

confidence: 99%

Design of Hybrid Beamforming System Based on Practical Circuit Parameter of 6-Bit Millimeter-Wave Phase Shifters

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Therefore, we propose a novel 6GHz band signal access scheme to relief the problem of spectrum resource shortage [2]. In the future, 6GHz band will be with 2.4GHz and 5GHz bands for data transmission, reduce the burden of other bands, further increase user access number, improve network quality [3][4][5]. The proposal of the scheme also provides new way for the development of 6G mobile communication technology in the future [6].…”

Section: Introductionmentioning

confidence: 99%

An optical access scheme with 1.25Gbit/s NRZ downstream signals over 6GHz subcarrier for next generation mobile systems application

et al. 2022

View full text Add to dashboard Cite

In order to solve the problem of network frequency resource congestion from the central office (CS) to the base station (BS) in sixth generation (6G) mobile communication systems, we design a passive optical network (PON) access scheme. 1.25Gbit/s non-return-to-zero (NRZ) downstream signals over 6GHz subcarrier are successfully transmitted in the 20km single-mode fiber (SMF) and allocated to 4 optical network units (ONUs). The radio frequency (RF) spectrums, optical spectrums, eye-diagrams and bit error rate (BER) before and after transmission of NRZ signals in the system were measured and analysed. The results show that, this scheme can provide high-speed, stable and secure data communication.

show abstract

A Wideband IQ-Mapping Direct-Digital RF Modulator for 5G Transmitters

Shen

Bootsman

Alavi

et al. 2022

IEEE J. Solid-State Circuits

View full text Add to dashboard Cite

This article presents a wideband 2 × 12-bit direct-digital RF modulator (DDRM) operating in a 0.5-to-3-GHz band for 5G transmitters. The proposed digital Cartesian modulator features an advanced IQ-mapping technique to boost RF power by 3 dB and suppress the I/ Q image. To verify the proposed concept, a 40-nm CMOS prototype is implemented whose RF peak output power at 2 GHz is more than 14 dBm. It achieves an adjacent-channel leakage ratio (ACLR) of −52 dBc and an error vector magnitude (EVM) of −40 dB for a 20-MHz 256-QAM signal at 2.4 GHz. With a 320-MHz 256-QAM signal, the measured ACLR and EVM performances are better than −43 dBc and −32 dB at 2.4 GHz, respectively, without using any digital pre-distortion.

show abstract

A 6-GHz MU-MIMO Eight-Element Direct Digital Beamforming TX Utilizing FIR H-Bridge DAC

Cited by 8 publications

References 7 publications

Design of Hybrid Beamforming System Based on Practical Circuit Parameter of 6-Bit Millimeter-Wave Phase Shifters

Design of Hybrid Beamforming System Based on Practical Circuit Parameter of 6-Bit Millimeter-Wave Phase Shifters

An optical access scheme with 1.25Gbit/s NRZ downstream signals over 6GHz subcarrier for next generation mobile systems application

A Wideband IQ-Mapping Direct-Digital RF Modulator for 5G Transmitters

Contact Info

Product

Resources

About