Distortion and impairments mitigation and compensation of single‐ and multi‐band wireless transmitters (invited)

Ghannouchi, Fadhel M.; Younes, Mayada; Rawat, Meenakshi

doi:10.1049/iet-map.2012.0663

Cited by 24 publications

(25 citation statements)

References 50 publications

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“…where R is defined similarly to P now with y(n−m) replacing x(n − m) in equation (4). The input is now estimated from the output samples and the estimation error can be calculated as:…”

Section: Linearization Of Active Phased Arraymentioning

confidence: 99%

“…Different existing linearization methods are able to reduce the nonlinear distortions while keeping the PA as efficient as possible [3]. Digital predistortion (DPD) has been widely used for improvement of transmitter efficiency but generally on a single power amplifier and single antenna [4]. The new generation of active arrays considered for 5G mobile communication, is using a set of highly integrated active arrays, as illustrated in Fig.1.…”

Section: Introductionmentioning

confidence: 99%

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Linearization Trade-Offs in a 5G mmWave Active Phased Array OTA Setup

et al. 2020

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The new generation of 5G mobile communication systems is using millimeter wave (mmWave) active phased arrays (APA) which have up to hundreds of individual analog transmitter and receiver chains and antennas. For these highly integrated systems linearization of each analog path is very challenging. Therefore a single input single output (SISO) system in combination with over the air (OTA) measurement is considered as an efficient approach for linearization. However, the knowledge about the dependency of the total SISO nonlinearity on the contributions from different blocks in the antenna array, as well as the linearization trade-offs is still missing. In this paper, an overview of the possible linearization trade-offs in an OTA setup with a mmWave APA is provided. The linearization technique is applied to a 4x4 active phased array containing up-conversion of a sub 6 GHz LTE10 signal to an RF frequency of 28 GHz. Through measurements, the effects on adjacent channel power ratio (ACPR) and error vector magnitude (EVM) have been investigated for the following scenarios: i. impact from the up-converter, ii. impact of the steering angle due to antenna crosstalk and iii. a linearity comparison between a linearized and a backed-off system. INDEX TERMS active phased array (APA), single input single output (SISO), over the air (OTA), power amplifier (PA), millimeter wave (mmWave), digital pre-distortion (DPD).

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“…where R is defined similarly to P now with y(n−m) replacing x(n − m) in equation (4). The input is now estimated from the output samples and the estimation error can be calculated as:…”

Section: Linearization Of Active Phased Arraymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Linearization Trade-Offs in a 5G mmWave Active Phased Array OTA Setup

et al. 2020

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“…Apparently, in the literature, several models such as, Volterra series-based model, neural network-based models, and variations of memory polynomial models, have been proposed, which successfully model and mitigate the impairments introduced by modulator and power amplifiers [13,14,15,16,17,18]. However, this comes at the cost of complexity and higher processing rates.…”

Section: Introductionmentioning

confidence: 99%

Forward Behavioral Modeling of a Three-Way Amplitude Modulator-Based Transmitter Using an Augmented Memory Polynomial

Chatrath

Aziz

Helaoui

2018

Sensors

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Reconfigurable and multi-standard RF front-ends for wireless communication and sensor networks have gained importance as building blocks for the Internet of Things. Simpler and highly-efficient transmitter architectures, which can transmit better quality signals with reduced impairments, are an important step in this direction. In this regard, mixer-less transmitter architecture, namely, the three-way amplitude modulator-based transmitter, avoids the use of imperfect mixers and frequency up-converters, and their resulting distortions, leading to an improved signal quality. In this work, an augmented memory polynomial-based model for the behavioral modeling of such mixer-less transmitter architecture is proposed. Extensive simulations and measurements have been carried out in order to validate the accuracy of the proposed modeling strategy. The performance of the proposed model is evaluated using normalized mean square error (NMSE) for long-term evolution (LTE) signals. NMSE for a LTE signal of 1.4 MHz bandwidth with 100,000 samples for digital combining and analog combining are recorded as −36.41 dB and −36.9 dB, respectively. Similarly, for a 5 MHz signal the proposed models achieves −31.93 dB and −32.08 dB NMSE using digital and analog combining, respectively. For further validation of the proposed model, amplitude-to-amplitude (AM-AM), amplitude-to-phase (AM-PM), and the spectral response of the modeled and measured data are plotted, reasonably meeting the desired modeling criteria.

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“…A Simplified Volterra Series (SVS) model was developed in [11]. First, it takes advantage of an additional complex branch where the complex conjugate of the input samples is used to enhance the ability of the DPD to suppress the IQ-imbalance drawbacks [17]. Then, the Dynamic Deviation Reduction (DDR) approach [18] is used to reduce the number of input samples combinations.…”

Section: Introductionmentioning

confidence: 99%

Digital Predistorter Design Using a Reduced Volterra Model to Linearize GaN RF Power Amplifiers

Rezgui¹,

Rouissi²,

Ghazel³

2018

RADIOENGINEERING

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In this paper, a novel method for reducing a Simplified Volterra Series (SVS) model size is proposed for GaN RF Power Amplifier (PA) Digital Predistorter (DPD) design. Using the SVS-modified model, the number of coefficients needed for the PA behavioral modeling and predistortion can be reduced by 60% while maintaining acceptable performances. Simulation and implementation tests are performed for a Class AB GaN PA and Doherty GaN PA using a 20-MHz Long Term Evolution-Advanced (LTE-A) signal. The Adjacent Channel Power Ratio (ACPR) attains-40 dB and-41 dB for the Doherty and Class AB GaN PAs, respectively. The implementation complexity is also studied and the obtained results prove the capability of the proposed model to linearize PA using 3% of the Slice LUTs and 87% of the DSP48E1 available in the Xilinx Zynq-7000 FPGA.

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Distortion and impairments mitigation and compensation of single‐ and multi‐band wireless transmitters (invited)

Cited by 24 publications

References 50 publications

Linearization Trade-Offs in a 5G mmWave Active Phased Array OTA Setup

Linearization Trade-Offs in a 5G mmWave Active Phased Array OTA Setup

Forward Behavioral Modeling of a Three-Way Amplitude Modulator-Based Transmitter Using an Augmented Memory Polynomial

Digital Predistorter Design Using a Reduced Volterra Model to Linearize GaN RF Power Amplifiers

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