A High-Performance Complexity Reduced Behavioral Model and Digital Predistorter for MIMO Systems With Crosstalk

Abdelhafiz, Abubaker; Behjat, Laleh; Ghannouchi, Fadhel M.; Helaoui, Mohamed; Hammi, Oualid

doi:10.1109/tcomm.2016.2545654

Cited by 58 publications

(39 citation statements)

References 18 publications

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“…With moderate crosstalk levels, it is therefore likely that using this signal model will provide a very favorable tradeoff between cancellation performance and computational complexity. However, as already discussed, in highly integrated transceivers explicit modeling of the crosstalk between the transmitters is likely required in order to ensure sufficient cancellation performance [28].…”

Section: Nonlinear Signal Model Without Crosstalkmentioning

confidence: 99%

“…The first step in obtaining the desired PCA transformation matrix is to determine the least squares channel estimate given in (28) using all the basis functions. This estimate should be calculated with the highest possible transmit power, since the nonlinear SI terms that are negligible with the highest power will also be negligible with any lower transmit power.…”

Section: Computationally Efficient Estimation With Principal Componenmentioning

confidence: 99%

“…In particular, more computational resources are needed to estimate all the channel responses between the several transmitters and receivers, but no additional RF hardware is required. However, having several transmit chains on a single chip introduces another issue from the perspective of the digital canceller: the crosstalk between the transmitters, which occurs both before and after the power amplifiers (PAs) [22][23][24][25][26][27][28]. This phenomenon is illustrated in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…1 An illustration of the crosstalk phenomenon in a three-antenna MIMO transmitter, where crosstalk occurs both before and after the PAs. The former is typically referred to as nonlinear crosstalk, while the latter is called linear crosstalk high level of integration, which results in more leakage between the transmission paths [28]. Hence, the increase in computational complexity caused by the crosstalk modeling must be tolerated in order to obtain sufficient levels of SI cancellation also under MIMO operation.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Nonlinear self-interference cancellation in MIMO full-duplex transceivers under crosstalk

Korpi

Anttila

Valkama

2017

J Wireless Com Network

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This paper presents a novel digital self-interference canceller for an inband multiple-input-multiple-output (MIMO) full-duplex radio. The signal model utilized by the canceller is capable of modeling the in-phase quadrature (IQ) imbalance, the nonlinearity of the transmitter power amplifier, and the crosstalk between the transmitters, thereby being the most comprehensive signal model presented thus far within the full-duplex literature. Furthermore, it is also shown to be valid for various different radio frequency (RF) cancellation solutions. In addition to this, a novel complexity reduction scheme for the digital canceller is also presented. It is based on the widely known principal component analysis, which is used to generate a transformation matrix for controlling the number of parameters in the canceller. Extensive waveform simulations are then carried out, and the obtained results confirm the high performance of the proposed digital canceller under various circuit imperfections. The complexity reduction scheme is also shown to be capable of removing up to 65% of the parameters in the digital canceller, thereby significantly reducing its computational requirements.

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Section: Nonlinear Signal Model Without Crosstalkmentioning

confidence: 99%

Section: Computationally Efficient Estimation With Principal Componenmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nonlinear self-interference cancellation in MIMO full-duplex transceivers under crosstalk

Korpi

Anttila

Valkama

2017

J Wireless Com Network

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“…Since the techniques do not consider necessary crossterms between signals of different transmit paths, they are not suitable for linearization of multi-antenna transmitters with antenna crosstalk. The authors of [14] include certain crossterms between different transmit paths in their augmented crossover DPD. However, also their system model does not consider mixing between the crosstalk and the PA output signals.…”

Section: Introductionmentioning

confidence: 99%

Digital Predistortion for Multi-Antenna Transmitters Affected by Antenna Crosstalk

Hausmair

Landin

Gustavsson

et al. 2018

IEEE Trans. Microwave Theory Techn.

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In this paper, a digital predistortion (DPD) technique for wideband multi-antenna transmitters is proposed. The proposed DPD compensates for the combined effects of power amplifier (PA) nonlinearity, antenna crosstalk and impedance mismatch. The proposed technique consists of a linear crosstalk and mismatch model block shared by all transmit paths, and a dual-input DPD block in every transmit path. By avoiding the use of multi-input DPD blocks in every transmit path, the complexity of the proposed technique is kept low and scales more favorably with the number of antennas than competing techniques. It is shown that all blocks can be identified from measurements of the PA output signals using least-squares estimation. Measurement results of a four-path transmitter are presented and used to evaluate the proposed DPD technique against existing techniques. The results show that the performance of the proposed DPD technique is similar to those of existing techniques, while the complexity is lower.

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Calibration of a fully-switched MIMO channel sounder with internal crosstalk

Lee

Kim

et al. 2019

Signal Processing

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A High-Performance Complexity Reduced Behavioral Model and Digital Predistorter for MIMO Systems With Crosstalk

Cited by 58 publications

References 18 publications

Nonlinear self-interference cancellation in MIMO full-duplex transceivers under crosstalk

Nonlinear self-interference cancellation in MIMO full-duplex transceivers under crosstalk

Digital Predistortion for Multi-Antenna Transmitters Affected by Antenna Crosstalk

Calibration of a fully-switched MIMO channel sounder with internal crosstalk

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