Author : Prof. F. M. Ghannouchi
Fellow IEEE and IEEE-MTT-S Emeritus Distinguish Microwave Lecturer
Professor, Alberta Innovates Strategic/ Canada Research Chair in Green Radio Systems
Director, iRadio Laboratory (www.ucalgary.ca)
Department of Electrical and Computer Engineering,
University of Calgary, Canada
Fellow IEEE and IEEE-MTT-S Emeritus Distinguish Microwave Lecturer
Professor, Alberta Innovates Strategic/ Canada Research Chair in Green Radio Systems
Director, iRadio Laboratory (www.ucalgary.ca)
Department of Electrical and Computer Engineering,
University of Calgary, Canada
BIOGRAPHY
Fadhel Ghannouchi is currently a professor, Alberta Innovates/Canada Research Chair and Director of the iRadio Laboratory (www.iradio.ucalgary.ca) in the Department of Electrical and Computer Engineering at the University of Calgary, Alberta.
His research interests are in the areas of RF and wireless communications, nonlinear modeling of microwave devices and communications systems, design of power- and spectrum-efficient microwave amplification systems and design of SDR systems for wireless and satellite communications applications. His research has led to over 700 refereed publications and 20 US patents (5 pending), 4 books and 3 spun-off companies.
Fadhel Ghannouchi is currently a professor, Alberta Innovates/Canada Research Chair and Director of the iRadio Laboratory (www.iradio.ucalgary.ca) in the Department of Electrical and Computer Engineering at the University of Calgary, Alberta.
His research interests are in the areas of RF and wireless communications, nonlinear modeling of microwave devices and communications systems, design of power- and spectrum-efficient microwave amplification systems and design of SDR systems for wireless and satellite communications applications. His research has led to over 700 refereed publications and 20 US patents (5 pending), 4 books and 3 spun-off companies.
"Delta-Sigma based RF Transmitters for Software Defined Radio Applications"
ABSTRACT
The next wave in the information revolution will consist of bringing intelligence to the information and communication technology (ICT) sector, allowing seamless and intelligent networking and communication between different users using different services and operators. This will lead to the convergence of communication technologies, aiming at the development and deployment of cooperative and ubiquitous networks that involve existing and future wireless and satellite communications systems. A critical element in enabling the convergence of different communication systems is the development of software defined radio (SDR) systems that can be used across different frequency bands and for multi-standard applications. This SDR has to be developed to support different frequency carriers and modulation schemes concurrently, in addition to being power- and spectrum-efficient, in order to be able handle high data rates, while being less energy-hungry and more environmentally friendly.
The design of power amplifiers as critical components in any SRD based communication terminal has to be considered closely together with the system architecture, in order to ensure optimal system level performances in terms of quality of signal and power efficiency. This implies the use of adequate signal encoding schemes that convert the analog baseband signal to pulse train digital signal, such as pulse width modulation or (PWM) or sigma-delta modulation (DSM). This talk lays out the principles behind SDR Radio systems and examines the design of software-enabled linear and highly efficient RF/DSP co-designed power amplifiers/transmitters for multi-standard and multi-band applications. Recent advances and practical realizations of DSM based transmitters will also be presented and discussed.
The next wave in the information revolution will consist of bringing intelligence to the information and communication technology (ICT) sector, allowing seamless and intelligent networking and communication between different users using different services and operators. This will lead to the convergence of communication technologies, aiming at the development and deployment of cooperative and ubiquitous networks that involve existing and future wireless and satellite communications systems. A critical element in enabling the convergence of different communication systems is the development of software defined radio (SDR) systems that can be used across different frequency bands and for multi-standard applications. This SDR has to be developed to support different frequency carriers and modulation schemes concurrently, in addition to being power- and spectrum-efficient, in order to be able handle high data rates, while being less energy-hungry and more environmentally friendly.
The design of power amplifiers as critical components in any SRD based communication terminal has to be considered closely together with the system architecture, in order to ensure optimal system level performances in terms of quality of signal and power efficiency. This implies the use of adequate signal encoding schemes that convert the analog baseband signal to pulse train digital signal, such as pulse width modulation or (PWM) or sigma-delta modulation (DSM). This talk lays out the principles behind SDR Radio systems and examines the design of software-enabled linear and highly efficient RF/DSP co-designed power amplifiers/transmitters for multi-standard and multi-band applications. Recent advances and practical realizations of DSM based transmitters will also be presented and discussed.
"Distortion and Impairment’s Mitigation for MIMO and Carrier Aggregated Wireless Transmitters"
ABSTRACT
To accommodate the worldwide proliferation of cellular bands and ensure seamless and ubiquitous connectivity, next generation transceivers for LTE-A and 5G need to be able to operate concurrently with several radio interfaces. The Doherty amplifier architecture is being widely used in single–input single output (SISO) 3G and 4G base stations to enhance the power efficiency of the 3G and 4G base station along with digital predistortion (DPD) technique to mitigate the nonlinearity of the relatively narrow band transmission (up to 60 MHz) and hence enhance the quality of the signal at the antenna to meet the standard requirements in terms of in-band-distortion (EVM) and out-of-band distortion (ACPR). With the foreseen massive deployment of LTE and LTE-A (2015-2018) and 5G technology (2020 and beyond) to support, power and interconnect the Internet of Things (IoT), concurrent multi-stream multi-antenna (MIMO) and carrier aggregated (CA) efficient transmission technologies are being considered as key enabling technologies for the next generation networks beyond 4G and are currently being included in 4G+ (LTE-A) standards and beyond. These configurations call for the design of broadband/multi-band high efficient tranmitters.
The MIMO and multiband DPD technology are key enabling Technology to pre-process the MIMO and multi-band signals at a reasonable clock speed (equal to 3 to 5 times each single channel bandwidth) and mitigate linear and nonlinear distortion and hardware impairment for Carrier aggregated (CA) and multi stream /multi- antenna (MIMO) based transmitters. This technology is amplifier technology independent and can be used with any amplifier technology such as Doherty, LINC, and Envelope Tracking. Recent advances and practical realizations of MIMO/CA based transmitters will presented and discussed.
To accommodate the worldwide proliferation of cellular bands and ensure seamless and ubiquitous connectivity, next generation transceivers for LTE-A and 5G need to be able to operate concurrently with several radio interfaces. The Doherty amplifier architecture is being widely used in single–input single output (SISO) 3G and 4G base stations to enhance the power efficiency of the 3G and 4G base station along with digital predistortion (DPD) technique to mitigate the nonlinearity of the relatively narrow band transmission (up to 60 MHz) and hence enhance the quality of the signal at the antenna to meet the standard requirements in terms of in-band-distortion (EVM) and out-of-band distortion (ACPR). With the foreseen massive deployment of LTE and LTE-A (2015-2018) and 5G technology (2020 and beyond) to support, power and interconnect the Internet of Things (IoT), concurrent multi-stream multi-antenna (MIMO) and carrier aggregated (CA) efficient transmission technologies are being considered as key enabling technologies for the next generation networks beyond 4G and are currently being included in 4G+ (LTE-A) standards and beyond. These configurations call for the design of broadband/multi-band high efficient tranmitters.
The MIMO and multiband DPD technology are key enabling Technology to pre-process the MIMO and multi-band signals at a reasonable clock speed (equal to 3 to 5 times each single channel bandwidth) and mitigate linear and nonlinear distortion and hardware impairment for Carrier aggregated (CA) and multi stream /multi- antenna (MIMO) based transmitters. This technology is amplifier technology independent and can be used with any amplifier technology such as Doherty, LINC, and Envelope Tracking. Recent advances and practical realizations of MIMO/CA based transmitters will presented and discussed.