375 citations · 1.5k across the 22 of their papers we have counts for
24 papers
Compensation of correlated autoregressive clock jitter in arrays of Analog-to-Digital Converters
Daniele Gerosa, Lauri Anttila, Thomas Eriksson
In modern communication systems, the fidelity of analog-to-digital converters (ADCs) is limited by sampling clock jitter, i.e., small random timing deviations that undermine ideal…
Piecewise Digital Predistortion fo mmWave Active Antenna Arrays: Algorithms and Measurements
Alberto Brihuega, Mahmoud Abdelaziz, Lauri Anttila +4
In this paper, we describe a novel framework for digital predistortion (DPD) based linearization of strongly nonlinear millimeter-wave active antenna arrays. Specifically, we formu…
Full-Duplex OFDM Radar With LTE and 5G NR Waveforms: Challenges, Solutions, and Measurements
Carlos Baquero Barneto, Taneli Riihonen, Matias Turunen +5
This paper studies the processing principles, implementation challenges, and performance of OFDM-based radars, with particular focus on the fourth-generation Long-Term Evolution (L…
On Antenna Array Out-of-Band Emissions
Lauri Anttila, Alberto Brihuega, Mikko Valkama
We substantiate and extend recent research on the behavior of the out-of-band emissions in antenna array transmitters. Specifically, with multi-user precoding, we show that the emi…
Linearizing Active Antenna Arrays: Method and Measurements
Alberto Brihuega, Mahmoud Abdelaziz, Matias Turunen +3
In this paper, we provide a novel framework for efficient digital predistortion (DPD) based linearization of active antenna arrays with multiple and mutually different nonlinear po…
Gradient-Adaptive Spline-Interpolated LUT Methods for Low-Complexity Digital Predistortion
Pablo Pascual Campo, Alberto Brihuega, Lauri Anttila +4
In this paper, new digital predistortion (DPD) solutions for power amplifier (PA) linearization are proposed, with particular emphasis on reduced processing complexity in future 5G…
Digital Predistortion for Multiuser Hybrid MIMO at mmWaves
Alberto Brihuega, Lauri Anttila, Mahmoud Abdelaziz +2
Efficient mitigation of power amplifier (PA) nonlinear distortion in multi-user hybrid precoding based broadband mmWave systems is an open research problem. In this article, we fir…
Digital Cancellation of Passive Intermodulation in FDD Transceivers
Muhammad Zeeshan Waheed, Pablo Pascual Campo, Dani Korpi +3
Modern radio systems and transceivers utilize carrier aggregation (CA) to meet the demands for higher and higher data rates. However, the adoption of CA in the existing Long Term E…
Digital Predistortion in Large-Array Digital Beamforming Transmitters
Alberto Brihuega, Lauri Anttila, Mahmoud Abdelaziz +1
In this article, we propose a novel digital predistortion (DPD) solution that allows to considerably reduce the complexity resulting from linearizing a set of power amplifiers (PAs…
Performance Comparison of Constant Envelope and Zero-forcing Precoders in Multiuser Massive MIMO
Alberto Brihuega, Lauri Anttila, Mikko Valkama
In this article, the adoption and performance of a constant envelope (CE) type spatial precoder is addressed in large-scale multiuser MIMO based cellular network. We first formulat…
Digital Predistortion for Hybrid MIMO Transmitters
Mahmoud Abdelaziz, Lauri Anttila, Alberto Brihuega +2
This article investigates digital predistortion (DPD) linearization of hybrid beamforming large-scale antenna transmitters. We propose a novel DPD processing and learning technique…
Adaptive Nonlinear RF Cancellation for Improved Isolation in Simultaneous Transmit-Receive Systems
Adnan Kiayani, Muhammad Zeeshan Waheed, Lauri Anttila +7
This paper proposes an active radio frequency (RF) cancellation solution to suppress the transmitter (TX) passband leakage signal in radio transceivers supporting simultaneous tran…
Parallel Digital Predistortion Design on Mobile GPU and Embedded Multicore CPU for Mobile Transmitters
Kaipeng Li, Amanullah Ghazi, Chance Tarver +6
Digital predistortion (DPD) is a widely adopted baseband processing technique in current radio transmitters. While DPD can effectively suppress unwanted spurious spectrum emissions…
Low-Complexity Sub-band Digital Predistortion for Spurious Emission Suppression in Noncontiguous Spectrum Access
Mahmoud Abdelaziz, Lauri Anttila, Chance Tarver +3
Noncontiguous transmission schemes combined with high power-efficiency requirements pose big challenges for radio transmitter and power amplifier (PA) design and implementation. Du…
Full-Duplex Mobile Device - Pushing the Limits
Dani Korpi, Joose Tamminen, Matias Turunen +5
In this article, we address the challenges of transmitter-receiver isolation in \emph{mobile full-duplex devices}, building on shared-antenna based transceiver architecture. Firstl…
Impact of Received Signal on Self-interference Channel Estimation and Achievable Rates in In-band Full-duplex Transceivers
Dani Korpi, Lauri Anttila, Mikko Valkama
In this paper we analyze the effect of the calibration period, or lack of, on self-interference channel estimation in the digital domain of in-band full-duplex radio transceivers.…
Feasibility of In-band Full-Duplex Radio Transceivers with Imperfect RF Components: Analysis and Enhanced Cancellation Algorithms
Dani Korpi, Lauri Anttila, Mikko Valkama
In this paper we provide an overview regarding the feasibility of in-band full-duplex transceivers under imperfect RF components. We utilize results and findings from the recent re…
Modeling and Efficient Cancellation of Nonlinear Self-Interference in MIMO Full-Duplex Transceivers
Lauri Anttila, Dani Korpi, Emilio Antonio-Rodríguez +2
This paper addresses the modeling and digital cancellation of self-interference in in-band full-duplex (FD) transceivers with multiple transmit and receive antennas. The self-inter…
Reference Receiver Based Digital Self-Interference Cancellation in MIMO Full-Duplex Transceivers
Dani Korpi, Lauri Anttila, Mikko Valkama
In this paper we propose and analyze a novel self-interference cancellation structure for in-band MIMO full-duplex transceivers. The proposed structure utilizes reference receiver…
Widely-Linear Digital Self-Interference Cancellation in Direct-Conversion Full-Duplex Transceiver
Dani Korpi, Lauri Anttila, Ville Syrjälä +1
This article addresses the modeling and cancellation of self-interference in full-duplex direct-conversion radio transceivers, operating under practical imperfect radio frequency (…
Analysis of Oscillator Phase-Noise Effects on Self-Interference Cancellation in Full-Duplex OFDM Radio Transceivers
Ville Syrjala, Mikko Valkama, Lauri Anttila +2
This paper addresses the analysis of oscillator phase-noise effects on the self-interference cancellation capability of full-duplex direct-conversion radio transceivers. Closed-for…
Advanced Self-interference Cancellation and Multiantenna Techniques for Full-Duplex Radios
Dani Korpi, Sathya Venkatasubramanian, Taneli Riihonen +7
In an in-band full-duplex system, radios transmit and receive simultaneously in the same frequency band at the same time, providing a radical improvement in spectral efficiency ove…
Cancellation of Power Amplifier Induced Nonlinear Self-Interference in Full-Duplex Transceivers
Lauri Anttila, Dani Korpi, Ville Syrjälä +1
Recently, full-duplex (FD) communications with simultaneous transmission and reception on the same channel has been proposed. The FD receiver, however, suffers from inevitable self…
Full-Duplex Transceiver System Calculations: Analysis of ADC and Linearity Challenges
Dani Korpi, Taneli Riihonen, Ville Syrjälä +3
Despite the intensive recent research on wireless single-channel full-duplex communications, relatively little is known about the transceiver chain nonidealities of full-duplex dev…