Hugo M. Tullberg

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Societal development will lead to changes in the way mobile and wireless communication systems are used. Essential services such as e-banking, elearning, and e-health will continue to proliferate and become more mobile. On-demand information and entertainment (e.g., in the form of augmented reality) will progressively be delivered over mobile and wireless(More)
This article considers spectrum-on-demand in a cellular system. A communication system that wants to access spectrum to which it does not own a license must perform spectrum sensing to identify spectrum opportunities, and to guarantee that it does not cause unacceptable interference to the license owner. Because a single sensor may be in a fading dip,(More)
In 2020, mobile and wireless traffic volume is expected to increase thousand-fold over 2010 figures. Moreover, an increase in the number of wirelessly-connected devices to counts in the tens of billions will have a profound impact on society. Massive machine communication, forming the basis for the Internet of Things, will make our everyday life more(More)
In this paper we propose a Serial Concatenated Trellis Coded Modulation system using one or more inner accumulate code(s) and a Gray-labeled signal constellation. We show the existence of a threshold, such that if the signal-to-noise ratio (SNR) exceeds this threshold, the bit error probability goes to zero as the blocklength goes to infinity. Tight(More)
Dear MMTC colleagues: It is really a great honor for me to serve as the Asia vice-chair for this vital ComSoc Committee during the period 2014-2016! As part of my duties, I have contributed to the initial setting of the Interest Groups (IGs) and I am starting to work on the promotion of Special Issues (SIs)/symposiums/workshops with top(More)
In a companion paper, we showed the existence of decoding thresholds for maximum-likelihood (ML) decoding of a serial concatenated trellis-coded modulation (SCTCM) system with one or more inner accumulate codes. In this paper, we compute the decoding thresholds for an iterative, non-ML decoder by density evolution (DE), assuming infinite blocklengths. We(More)
The METIS project is laying the foundations of Fifth Generation (5G) mobile and wireless communication system putting together the point of view of vendors, operators, vertical players and academia. METIS envisions a 5G system concept that efficiently integrates new applications developed in the METIS horizontal topics and evolved versions of existing(More)
The METIS project is laying the foundation of 5G mobile and wireless communication systems putting together the point of view of vendors, operators, third party players and academia. In particular, METIS is developing and evaluating the key technology components of 5G systems. In this framework, a new mobile and wireless network architecture is required to(More)