Multi-Stream Spatial Digital Predistortion for Fully-Connected Hybrid Beamforming Massive MIMO Transmitters

Liu, Xin; Chen, Wenhua; Chu, Jiaming; Ghannouchi, Fadhel M.; Feng, Zhenghe

doi:10.1109/tcsi.2021.3072591

Cited by 23 publications

(6 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is noted that similar nonlinear models have been utilized to characterize digital TXs affected by nonlinear crosstalk [8], [24], [25], to model concurrent dual-band TXs [32], to model the passive-intermodulation present in frequency-division duplexing radios [33], or to model the different intermodulation products in fully connected hybrid beamforming TX architectures [13]. In addition, we note that the model in (17) can be generalized to U > 2 users by considering a multivariable polynomial model of the form of [13, eq.…”

Section: A Spatial Characteristics Of Nonlinear Distortion Under Mult...mentioning

confidence: 99%

“…On the other hand, the proposed beam-level DPD tackles the problem from a beamformed channel perspective, implying that the output of the observation receiver provides a coherent sum of the antenna signals, which is then provided to the DPD learning engine. However, the resulting crosstalk terms are summed noncoherently, and thus, they are diluted in comparison to the distortion in (13). Hence, such combined feedback configuration provides robustness against unmodeled nonbeamformed distortion [18].…”

Section: Impact Of Array Crosstalkmentioning

confidence: 99%

“…L INEARIZATION of active array radio transmitters (TXs) with large numbers of antennas and power amplifier (PA) units is one timely topic in digital predistortion (DPD) research, posing many new challenges compared to classical single PA linearization [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14]. The operation principle and specific implementation of DPD solutions tailored for antenna arrays depend heavily on the considered TX architecture.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Beam-Level Frequency-Domain Digital Predistortion for OFDM Massive MIMO Transmitters

Brihuega

Anttila

Valkama

2023

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

In this article, a novel digital predistortion (DPD) solution for fully digital multiple-input-multiple-output (MIMO) transmitters (TXs) is proposed. Opposed to classical DPD solutions that operate at TX chain or antenna level, the proposed DPD operates at the stream or beam level, and hence, its complexity is proportional to the number of spatially multiplexed streams or users rather than to the number of antennas. In addition, the proposed beam-level DPD operates in the frequency domain (FD), which makes it possible to provide flexible frequency-dependent linearization of the transmit waveforms. This feature is very well suited to the linearity requirements applicable at the 5G new radio (NR) frequency-range 2 (FR2), where the inband quality requirements commonly limit the feasible TX power and can also vary significantly within the channel bandwidth depending on the utilized data modulation and coding schemes of the different frequency-multiplexed users. Altogether, the proposed solution enables a large reduction in the computational complexity of the overall DPD system, and its performance is demonstrated and verified through both experimental and simulation-based results.

show abstract

Section: A Spatial Characteristics Of Nonlinear Distortion Under Mult...mentioning

confidence: 99%

Section: Impact Of Array Crosstalkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Beam-Level Frequency-Domain Digital Predistortion for OFDM Massive MIMO Transmitters

Brihuega

Anttila

Valkama

2023

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

show abstract

“…Due to the multi-dimensional MP-DPD model, the cross-channel modulations are significantly suppressed at the cost of high computational complexity. These authors have extended their work in [204] by linearizing more (4) streams of the FC-HPD array. It has been shown that the multivariable DPD model can effectively mitigate the high-order IMD radiations imposed on the linear beam streams in a real transmission scenario, which altogether deviated from the analog PS modulation.…”

Section: Hybrid Predistortion (Hpd)mentioning

confidence: 99%

“…As the cross-memory terms are shared across the array channels, it is of interest to contemplate the geometric sets of SISO-DPD coefficients [213] to amend wide signal modulation bandwidths in a common-DPD oriented MIMO system. On the other hand, in FC hybrid MIMO system [204], a potential research opportunity could be to reduce the high sampling rates of DPD modules at continuous MMW bands. The lineardecomposition-based DPD modeling in [138] can be explored for FC-HPD architecture to limit the oversampling rates of dedicated DSP units while preserving high linearity.…”

Section: Future Research Directionsmentioning

confidence: 99%

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

Haider

You

et al. 2022

IEEE Commun. Surv. Tutorials

View full text Add to dashboard Cite

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.

show abstract

An ℓ0-norm-constrained adaptive algorithm for joint beamforming and antenna selection

Robert

Pitz

Batista

et al. 2022

Digital Signal Processing

View full text Add to dashboard Cite

Multi-Stream Spatial Digital Predistortion for Fully-Connected Hybrid Beamforming Massive MIMO Transmitters

Cited by 23 publications

References 28 publications

Beam-Level Frequency-Domain Digital Predistortion for OFDM Massive MIMO Transmitters

Beam-Level Frequency-Domain Digital Predistortion for OFDM Massive MIMO Transmitters

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

An ℓ0-norm-constrained adaptive algorithm for joint beamforming and antenna selection

Contact Info

Product

Resources

About