Wideband Predistortion Technique With Dual-Parallel Schottky Diodes for Low Power RoF Systems

Kim, Hyungsoo; Lee, Jae-Sang; Son, Byung Hee; Jeon, Su-Jin; Hong, Seung‐Tae; Kim, Kwang‐Jin; Choi, Young‐Wan

doi:10.1109/lpt.2021.3076188

Cited by 3 publications

(2 citation statements)

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“…The PD model has been used in an RoF transmission, taking into account the realistic linear impairments of optical components such as laser, photodiode, filters, and semiconductor amplifiers. In detail, to efficiently analyze the nonlinear combinatorial effects of long-haul RoF transmission system, authors in [242], and [243] have incorporated the concept of DPD and Schottky diode-based APD for broadband LTE and 5G systems, respectively. In the proposed DPD approach, the feedback information is tested under the PVT variations without facing delay.…”

Section: Radio Over Fiber Communicationsmentioning

confidence: 99%

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Predistortion-Based Linearization for 5G and Beyond Millimeter-Wave Transceiver Systems: A Comprehensive Survey

Haider

You

et al. 2022

IEEE Commun. Surv. Tutorials

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The next-generation (5G/6G) wireless communication aims to leapfrog the currently occupied sub-6 GHz spectrum to the wideband millimeter-wave (MMW) spectrum. However, MMW spectrums with high-order modulation schemes drive the power amplifier (PA) at significant back-off, causing severe nonlinear distortions, thus deteriorating the transceiver's (TRXs) modulation process. Typically, the TRX efficacy is quantified with standardized linearization matrices, which take advantage of different predistortion (PD) schemes to handle deep compression of the PA. In this regard, TRX baseband signals are mostly linearized in the digital domain, where digitally controlled linearization needs higher sampling rates due to increasing MMW bandwidths to compensate for intermodulation (IMD) products, resulting in increased system cost and power consumption. Alternately, the digitally controlled analog-based linearization, i.e., the hybridization of digital predistortion (DPD) and analog predistortion (APD), is highly productive and cost-effective for fulfilling the linearized energy-efficient design vision of MMW networks. Therefore, this paper puts an extensive spotlight on the progress in PD-based linearization for 5G and beyond communications. It first provides background information on the advancements of PD schemes through recent surveys, then classifies the general roadmap of PD waveform processing across the TRX system models as preliminary. After this, we present three prominent PD architectures and their design approaches with intrinsic performance metrics. Finally, we explore four case studies encompassing PD operation under certain nonlinear constraints of different communication schemes. We examine the suitability of PD-based linearization solutions, both existing and proposed till the first quarter of 2022, and identify the potential prospects in this domain.

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Section: Radio Over Fiber Communicationsmentioning

confidence: 99%

“…• In RoF architecture, long-range transmission bandwidths may not indicate an optimal communication or downlink performance. The reason is that ensuing the superimposed multiplexing subcarriers through a fiber cable or free space incurs a linearity loss in the centralized light source [243].…”

Section: F Summary and Lessons Learnedmentioning

confidence: 99%