Multiuser-MIMO Transmitter Based on Optical Polar-Vector Modulators

Schneider, Garrett J.; Murakowski, Janusz; Shi, Shouyuan; Kermalli, Munawar; Galli, Stefano; Qi, Xiao-Feng; Prather, Dennis W.

doi:10.1109/lpt.2018.2868248

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…The opto-electronic implementation discussed here allows for a good demarcation between BBU and RRU, with a simple, low-cost RRU where antenna arrays can be simply swapped in and out while the core optical portion remains the same regardless of the utilized frequency bands. Novel optoelectronic lens-less implementations of MIMO transmitters have been previously reported by the Authors in [34], [35]. The experimental results reported in [34] confirmed the capability of conveying independent data over two different spatial beams simultaneously, using the same RF carrier.…”

Section: The Transmitter Architecturementioning

confidence: 53%

“…Novel optoelectronic lens-less implementations of MIMO transmitters have been previously reported by the Authors in [34], [35]. The experimental results reported in [34] confirmed the capability of conveying independent data over two different spatial beams simultaneously, using the same RF carrier. Although optoelectronic lens-less implementations of MIMO transmitters are interesting, this paper focuses on architectures supporting lens-based beamforming at the transmitter as they allow performing analog or fully connected hybrid beamforming [36]- [38] with the many benefits mentioned in the previous sections.…”

Section: The Transmitter Architecturementioning

confidence: 53%

“…The suitability of photonic transmitter arrays for MU-MIMO was demonstrated in the results found in [34]. In that work, a TOPS source was used to set the carrier frequency, and optical modulation was used to simultaneously encode data and beamform for two simulated users with a 1×2 transmitter array.…”

Section: A Transmitter Architecturementioning

confidence: 99%

See 2 more Smart Citations

Fourier-Optics Based Opto-Electronic Architectures for Simultaneous Multi-Band, Multi-Beam, and Wideband Transmit and Receive Phased Arrays

Prather

Galli²,

Schneider

et al. 2023

IEEE Access

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Current trends in wireless communications require a Base Transceiver Station (BTS) to support an ever-increasing number of antennas, wider bandwidths, multiple frequency bands, and many simultaneous beams. This is a tall order when considering all-electronic implementations, especially when operating at high carrier frequencies. We describe here Fourier-optics based opto-electronic architectures that include analog and fully connected transmit (TX) and receive (RX) implementations that support simultaneous multiband, multi-beam phased arrays where optical up-and down-conversion are used to generate IF/RF and RF/IF, respectively, signals for simultaneous multi-user and multi-beam transmission and reception over a wide range of frequencies. The proposed lens-based architectures have the ability to transmit and receive multiple distinct beams simultaneously even when only analog beamforming is performed, thus greatly simplifying the tasks of cell search and initial access without having to resort to complex matrix-based beamforming networks. Additionally, lens-based TX and RX beamforming is performed in the analog optical domain with zero power consumption and negligible latency bounded only by the time the light takes to travel through the lens. Photonic signal processing also reduces the number of RF components required at the remote radio unit (RRU) and the number of costly and power-hungry high-performance analog-to-digital/digital-toanalog converters (ADCs/DACs) required. The optical subsystems are ultra-wideband and frequency agnostic as only the front-end components (antennas, amplifiers) are RF frequency/band specific. Therefore, a single photonic system design may be operated at any band and, furthermore, existing installations may be modified/upgraded to operate in different bands with minimal component replacements needed. Finally, the presented architectures provide near unlimited beam-bandwidth product (BBP) with minimal power requirements and no external cooling. Theoretical analysis and experimental confirmation of the proposed architecture will both be reported, including a receiver with a nominal BBP of 36 GHz with a prototype system that consumed less than 300 W, thus yielding a power efficiency of beam formation of 8 W/GHz, which is more than a 6× improvement over the current state of the art.INDEX TERMS beamforming, microwave photonics, optical coherent detection, radio-over-fiber, wireless communications, beam bandwidth product.

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Section: The Transmitter Architecturementioning

confidence: 53%

Section: The Transmitter Architecturementioning

confidence: 53%

See 1 more Smart Citation

Fourier-Optics Based Opto-Electronic Architectures for Simultaneous Multi-Band, Multi-Beam, and Wideband Transmit and Receive Phased Arrays

Prather

Galli²,

Schneider

et al. 2023

IEEE Access

Self Cite

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Optically Driven, RF Transmit Phased Array Antennas for Mobile Communications and Wireless Networks

Prather

Shi

Konkol

et al. 2020

Wiley Encyclopedia of Electrical and Electronics Engineering

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This article introduces the use of optically fed, RF transmitting antennas for mobile communications and wireless networks. Motivation for the development of such antennas arises from the rapidly expanding allocations of electromagnetic spectrum by the Federal Communications Commission (FCC), which introduced spectral allocations extending up to 240 GHz. Because all electrical devices become lossy at such frequencies, photonic devices offer an attractive alternative. This article presents an overview of the use of photonic devices and systems for feeding and controlling RF phased array antennas for wireless communications. In particular, it introduces the concept of a current sheet as the ideal phase array antenna that offers a frequency‐independent impedance. The challenge has been the difficulty in designing a feed network capable of realizing such a dense array of current elements. To the extent that a photodetector is very small in comparison to RF wavelengths, it can serve as an ideal current source for a dense array. In addition, this article introduces not only broadband feed networks using photodetectors, but it also introduces novel feed architectures that offer significant control of the beam‐forming and data‐encoding to realize truly viable communication antennas.

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Tunable Optically Fed Radiofrequency Source for Distributing Coherent High-Fidelity Signals

Harrity,

Mahmud,

Schneider

et al. 2024

2024 IEEE/MTT-S International Microwave Symposium - IMS 2024

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Multiuser-MIMO Transmitter Based on Optical Polar-Vector Modulators

Cited by 4 publications

References 9 publications

Fourier-Optics Based Opto-Electronic Architectures for Simultaneous Multi-Band, Multi-Beam, and Wideband Transmit and Receive Phased Arrays

Fourier-Optics Based Opto-Electronic Architectures for Simultaneous Multi-Band, Multi-Beam, and Wideband Transmit and Receive Phased Arrays

Optically Driven, RF Transmit Phased Array Antennas for Mobile Communications and Wireless Networks

Tunable Optically Fed Radiofrequency Source for Distributing Coherent High-Fidelity Signals

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