Group Digital Predistortion With Step Uniformization for Hybrid Beamforming Transmitters

Li, Caoyu; He, Songbai; You, Fei; Peng, Hao; Peng, Jun

doi:10.1109/lmwc.2020.3038877

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…• To eliminate the factor of high sampling rates and hardware complexities of black-box signal processors, effective [33], [34], [175], [206]- [208] [31], [209], [210] [35], [36] Array-Based APD [57], [176], [177], [199] LUT-Based DPD [76], [133], [138], [180], [181] Adaptive DPD [39], [60], [66], [100], [134], [182]- [191] For Standalone PA [66], [194]- [196] For MIMO Systems [38], [197] [57], [68], [192], [197]- [200] [52], [109], [192], [193], [201]- [205] Fig. 7.…”

Section: Summary and Lessons Learnedmentioning

confidence: 99%

“…It has been shown that slight variations of amplitude weights have a notable impact on SLL, causing extra calculations to determine the mean-DPD coefficients for different SLL cases before assigning fixed beamforming weights in the direction of the targeted user. An alternate optimization approach of DPD and APD parameters is employed in wideband hybrid MIMO-TX to avoid complex formulations from compromising DPD algorithms [68], [200]. The presented HPD models are based on the analog step uniformization to linearize all the PAs in an array with a shared DPD.…”

Section: Hybrid Predistortion (Hpd)mentioning

confidence: 99%

“…In MIMO systems, a co-designed HPD framework can be treated as a group to jointly maximize the array uniformity and spatial isolation provided by the APD biasing and behavioral modeling offered by the shared DPD [200]. Interests in HPD solutions for beamforming design are motivated because the number of DSP modules is only lower-bounded by the feedback paths from the PAs output.…”

Section: Hybrid Predistortionmentioning

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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