Electrical and Information Technology

Faculty of Engineering LTH | Lund University

Ove Edfors



Project name Funding org
DARE -- Digitally-Assisted Radio Evolution, 2011-03-01 - 2016-03-31
DARE targets the design of radio receivers for cellular communications complying with the LTE Advanced standard. A downlink data rate of up to 1Gb/s is addressed, with an aggregated signal bandwidth of up to 100 MHz. In addition to the larger signal bandwidth, a data rate boost is achieved by means of multiple-input multiple-output (MIMO) radios. Furthermore, compared to earlier standards, LTE Advanced allows the received signal to be present over two or more non-contiguous bands (so-called carrier aggregation), a feature that poses new challenges to the practice of radio design. The power consumption in a typical LTE Advanced radio is going to be relatively high, and a power-aware design approach is called for. Apart from the obvious choice of state-of-the-art nanometer CMOS processes for circuit integration, the outstanding digital computation capability offered by such processes also enables the deployment of highly complex algorithms to save power while securing the radio performance, which is always, to some extent, limited by the imperfections of the analog circuits. The results of the DARE research are expected to be of practical use already in the near future, while in the longer term they will help the Swedish industry to take up the challenge from the world players in the cellular radio business. Conversely, DARE benefits hugely from the interaction with experienced researchers from the telecom industry, which provide standardization and system-level information typically not available within an academic environment. DARE has already obtained very significant results in the design of key building blocks of an LTE Advanced radio: wide-band low-noise reconfigurable receiver front-ends with high linearity; wide-band and low-phase noise VCOs; a digital PLL including novel PLL building blocks; wide-band, linear and digitally reconfigurable channel-select filters; a wide-band analog-to-digital converter based on a delta-sigma modulator; a complete receiver front-end together with a novel block merging the delta-sigma modulator within the channel-select filter; Matlab-based LTE RF and downlink simulators; a power-efficient channel estimation algorithm for OFDM systems; a fully digital approach to the removal of the leakage from the transmitter to the receiver in the radio; a reconfigurable digital baseband architecture for MIMO-OFDM applications; a power-efficient adaptive radio channel estimator; and an iterative MIMO detection and decoding receiver. A large number of analog and mixed-signal circuit prototypes have been designed and fabricated in a 65nm CMOS process, which has lately been replaced by a state-of-the-art 28nm FD-SOI CMOS process, available to DARE thanks to a collaboration with STMicroelectronics.
DISTRANT. Distributed antenna systems for efficient wireless systems., 2010-02-08 - 2016-06-30
For distributed antenna systems, which consist of a central processing unit that performs joint processing of the signals from a very large number of base station/access point antennas, there is currently a severe lack of knowledge regarding many very fundamental issues. In this project, we aim for an interdisciplinary research effort where we will study hardware architectures and hardware limitations as well as theoretical limits of possible network performance. In the first phase, we will develop an initial system design based on state-of-the-art knowledge, derive requirements on hardware and algorithms and create a test range for propagation channel studies. In the second phase, we will design and implement low cost RF heads and FPGA hardware, design algorithms based on propagation channel models from the first phase and ultimately evaluate the full system performance in our test range. The expected project outcomes are: 1) Network deployment guidelines for indoor and outdoor cellular and wireless systems when using distributed antenna systems; 2) Suitable hardware architectures and designs for low cost distributed antenna systems; 3) Low complex base band solutions for centralized processing; and 4) Propagation models for distributed antenna systems or large arrays.
MAMMOET, MAssive MiMO for Efficient Transmission, 2014-01-01 - 2016-12-31
The Internet of the future will to a large extent rely on mobile networks. Mobile data grew with 70% in 2012 and is predicted to grow 13-fold in the next 5 years. This puts very high demands on the development of mobile access technology. MAMMOET will advance the development of Massive MIMO (MaMi), a new and most promising direction in mobile access. MaMi makes a clean break with current technology by using several hundreds of base station antennas that operate phase-coherently together, simultaneously serving many tens of low-complexity single-antenna terminals in the same time-frequency resource. MAMMOET will demonstrate that MaMi can increase both data rates and the overall spectral efficiency by up to ten times, while decreasing the transmitted radiofrequency (RF) power by many orders of magnitude. Other benefits of MaMi include the extensive use of inexpensive low-power components, reduced latency, simplification of the multiple-access layer, and robustness to interference. The drastically reduced emitted RF power can reduce the total energy consumption of a mobile network, when implemented with simple, low power hardware developed in MAMMOET. Consequently, MaMi can, with proper system design, facilitate entirely new deployment scenarios, with wind or solar powered base stations. MAMMOET will substantially contribute to the development of practical MaMi systems and secure a leading position for European industry in its exploitation. Specifically, MAMMOET will investigate the practical limitations of MaMi, and develop complete technological solutions leveraging on innovative low-cost and drastically more efficient and flexible hardware.The academic and research institute partners in MAMMOET include pioneers in MaMi and groups with extensive experience in circuit design for wireless communications. The industrial partners are leaders in their fields and cover the entire chain from component manufacturing to system development and service provisioning.
EU (FP7)
Massive MIMO system aspects from a terminal perspective, 2015-01-01 - 2018-12-31
Massive MIMO (MM) technology is emerging as one of the major candidates for increasing efficiency of future wireless communications - both spectral and energy efficiencies. Recent predictions show that energy efficiency can be increased by several orders of magnitude and spectral efficiency by at least one order of magnitude, under reasonable assumptions on system configurations. Predictions like these have opened up a frenetic research activity in the field. Despite great efforts spent on investigating how efficient MM systems should be designed, the terminal perspective is almost entirely neglected. One reason for this is that most of the new concepts relate directly to the base station and only indirectly to the terminal devices. The terminal designs will, however, to a large extent influence how the MM systems of the future perform. Terminal design considerations will influence the entire systems, all the way from how well different MM transmission techniques perform under real conditions to how transmission protocols are designed. This project investigates influence of terminal devices on MM system performance, and how they should be designed to optimize system efficiency. The investigation spans the entire gamut from designing terminal prototypes to developing design methodologies. This is done by combining practical measurements and experimental studies in a MM testbed with more theoretical simulations and system optimizations.
VINNOVA Industrial Excellence Center - System Design on Silicon, 2008-01-01 - 2017-12-31
The Industrial Excellence Center in System Design on Silicon (SoS) covers four areas of circuits design: RF/analog, mixed-signal, digital, and emerging technologies. SoS is also part of a larger research environment, combining basic, applied, and industry related research projects. Additionally, SoS has a strong connection to other research areas at Lund University, e.g. radio systems, information theory, electromagnetic theory, signal processing, and solid-state physics. SoS has been active since 2008, and has continuously strengthened its profile as a well-known research center through both academic production and technology transfer. Research projects are planned with the industrial partners, and new ideas are continuously conceived, exchanged, and evolved. SoS is established as an internationally recognized research environment and the results of the research are represented in the most prestigious conferences and journals in the field e.g. ESSCIRC, ISSCC and JSSC.


Project name Funding org
Coding, Modulation, Data Security and their Implementation, 2006-01-01 - 2012-12-31
Lågkomplex beräkning av linjära förkodare för mycket stora MIMO system, 2012-01-01 - 2014-12-31
Mobile Wireless Access to Fixed Networks, 2000-01-01 - 2008-12-31
My Personal Adaptive Global NET and Beyond, 2006-01-01 - 2008-06-30
MAGNET Beyond is a worldwide R&D project within Mobile and Wireless Systems and Platforms Beyond 3G.
EU (FP6)
Power Aware Communications for Wireless OptiMised personal Area Networks, 2002-01-01 - 2005-12-31
PACWOMAN is aiming at developing enabling technologies for Personal Area Networks.
EU (FP5)
Scalable Multi-tasking Baseband for Mobile Communications, 2008-01-01 - 2010-12-31
EU (FP7)
Using WLANs for indoor surveillance, 2006-01-01 - 2007-12-31
WIreless interference-Limited high-throughput Access Technologies and applicatIons, 2008-01-01 - 2010-12-31