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Rasmussen, Lars KildehöjORCID iD iconorcid.org/0000-0001-7182-9543
Alternative names
Publications (10 of 199) Show all publications
Liu, D., Wang, C. & Rasmussen, L. K. (2019). Discontinuous Reception for Multiple-Beam Communication. IEEE Access, 7, 46931-46946
Open this publication in new window or tab >>Discontinuous Reception for Multiple-Beam Communication
2019 (English)In: IEEE Access, E-ISSN 2169-3536, Vol. 7, p. 46931-46946Article in journal (Refereed) Published
Abstract [en]

Discontinuous reception (DRX) techniques have successfully been proposed for energy savings in 4G radio access systems, which are deployed on legacy 2GHz spectrum bands with signal features of omnidirectional propagation. In upcoming 5G systems, higher frequency spectrum bands will also be utilized. Unfortunately higher frequency bands encounter more significant path loss, thus requiring directional beamforming to aggregate the radiant signal in a certain direction. We, therefore, propose a DRX scheme for multiple beam (DRXB) communication scenarios. The proposed DRXB scheme is designed to avoid unnecessary energy-and-time-consuming beam-training procedures, which enables longer sleep periods and shorter wake-up latency. We provide an analytical model to investigate the receiver-side energy efficiency and transmission latency of the proposed scheme. Through simulations, our approach is shown to have clear performance improvements over the conventional DRX scheme where beam training is conducted in each DRX cycle.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2019
Keywords
Discontinuous reception, beamforming, multiple-beam communication
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-251724 (URN)10.1109/ACCESS.2019.2909808 (DOI)000466485400001 ()2-s2.0-85065090753 (Scopus ID)
Note

QC 20190520

Available from: 2019-05-20 Created: 2019-05-20 Last updated: 2019-05-20Bibliographically approved
Liu, D., Vu, M. T., Chatterjee, S. & Rasmussen, L. K. (2019). ENTROPY-REGULARIZED OPTIMAL TRANSPORT GENERATIVE MODELS. In: 2019 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING (ICASSP): . Paper presented at 44th IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), MAY 12-17, 2019, Brighton, ENGLAND (pp. 3532-3536). IEEE
Open this publication in new window or tab >>ENTROPY-REGULARIZED OPTIMAL TRANSPORT GENERATIVE MODELS
2019 (English)In: 2019 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING (ICASSP), IEEE , 2019, p. 3532-3536Conference paper, Published paper (Refereed)
Abstract [en]

We investigate the use of entropy-regularized optimal transport (EOT) cost in developing generative models to learn implicit distributions. Two generative models are proposed. One uses EOT cost directly in an one-shot optimization problem and the other uses EOT cost iteratively in an adversarial game. The proposed generative models show improved performance over contemporary models on scores of sample based test.

Place, publisher, year, edition, pages
IEEE, 2019
Series
International Conference on Acoustics Speech and Signal Processing ICASSP, ISSN 1520-6149
Keywords
Optimal transport, generative models
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:kth:diva-261047 (URN)10.1109/ICASSP.2019.8682721 (DOI)000482554003151 ()2-s2.0-85068999197 (Scopus ID)978-1-4799-8131-1 (ISBN)
Conference
44th IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), MAY 12-17, 2019, Brighton, ENGLAND
Note

QC 20191001

Available from: 2019-10-01 Created: 2019-10-01 Last updated: 2019-10-01Bibliographically approved
Zaki, A., Mitra, P. P., Rasmussen, L. K. & Chatterjee, S. (2019). Estimate exchange over network is good for distributed hard thresholding pursuit. Signal Processing, 156, 1-11
Open this publication in new window or tab >>Estimate exchange over network is good for distributed hard thresholding pursuit
2019 (English)In: Signal Processing, ISSN 0165-1684, E-ISSN 1872-7557, Vol. 156, p. 1-11Article in journal (Refereed) Published
Abstract [en]

We investigate an existing distributed algorithm for learning sparse signals or data over networks. The algorithm is iterative and exchanges intermediate estimates of a sparse signal over a network. This learning strategy using exchange of intermediate estimates over the network requires a limited communication overhead for information transmission. Our objective in this article is to show that the strategy is good for learning in spite of limited communication. In pursuit of this objective, we first provide a restricted isometry property (RIP)-based theoretical analysis on convergence of the iterative algorithm. Then, using simulations, we show that the algorithm provides competitive performance in learning sparse signals vis-a-vis an existing alternate distributed algorithm. The alternate distributed algorithm exchanges more information including observations and system parameters.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Sparse learning, Distributed algorithm, Greedy pursuit algorithm, RIP analysis
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-240987 (URN)10.1016/j.sigpro.2018.10.010 (DOI)000453494200001 ()2-s2.0-85055577903 (Scopus ID)
Note

QC 20190110

Available from: 2019-01-10 Created: 2019-01-10 Last updated: 2019-06-11Bibliographically approved
Liu, D., Cavarec, B., Rasmussen, L. K. & Yue, J. (2019). On Dominant Interference in Random Networks and Communication Reliability. In: ICC 2019 - 2019 IEEE International Conference on Communications (ICC): . Paper presented at 2019 IEEE International Conference on Communications, ICC 2019; Shanghai International Convention Center, Shanghai; China; 20 May 2019 through 24 May 2019. Institute of Electrical and Electronics Engineers (IEEE), Article ID 8761613.
Open this publication in new window or tab >>On Dominant Interference in Random Networks and Communication Reliability
2019 (English)In: ICC 2019 - 2019 IEEE International Conference on Communications (ICC), Institute of Electrical and Electronics Engineers (IEEE), 2019, article id 8761613Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, we study the characteristics of dominant interference power with directional reception in a random network modelled by a Poisson Point Process. Additionally, the Laplace functional of cumulative interference excluding the n dominant interferers is also derived, which turns out to be a generalization of omni-directional reception and complete accumulative interference. As an application of these results, we study the impact of directional receivers in random networks in terms of outage probability and error probability with queue length constraint.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2019
Series
IEEE International Conference on Communications, E-ISSN 1938-1883
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-258168 (URN)10.1109/ICC.2019.8761613 (DOI)2-s2.0-85070216996 (Scopus ID)9781538680889 (ISBN)
Conference
2019 IEEE International Conference on Communications, ICC 2019; Shanghai International Convention Center, Shanghai; China; 20 May 2019 through 24 May 2019
Note

QC 20191007

Available from: 2019-10-07 Created: 2019-10-07 Last updated: 2019-10-07Bibliographically approved
Li, N., Xiao, M. & Rasmussen, L. K. (2019). Spectrum Sharing With Network Coding for Multiple Cognitive Users. IEEE Internet of Things Journal, 6(1), 230-238
Open this publication in new window or tab >>Spectrum Sharing With Network Coding for Multiple Cognitive Users
2019 (English)In: IEEE Internet of Things Journal, ISSN 2327-4662, Vol. 6, no 1, p. 230-238Article in journal (Refereed) Published
Abstract [en]

In this paper, an intelligently cooperative communication network with cognitive users is considered, where in a primary system and a secondary system, respectively, a message is communicated to their respective receiver over a packet-based wireless link. The secondary system assists in the transmission of the primary message employing network coding, on the condition of maintaining or improving the primary performance, and is granted limited access to the transmission resources as a reward. The users in both systems exploit their previously received information in encoding and decoding the binary combined packets. Considering the priority of legitimate users, a selective cooperation mechanism is investigated and the system performance based on an optimization problem is analyzed. Both the analytical and numerical results show that the condition for the secondary system accessing the licensed spectrum resource is when the relay link performs better than the direct link of the primary transmission. We also extend the system model into a network with multiple secondary users and propose two relay selection algorithms. Jointly considering the related link qualities, a best relay selection and a best relay group selection algorithm are discussed. Overall, it is found that the throughput performance can be improved with multiple secondary users, especially with more potential users cooperating in the best relay group selection algorithm.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2019
Keywords
Cooperative communication, multiuser, network coding, spectrum sharing
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-246273 (URN)10.1109/JIOT.2017.2728626 (DOI)000459709500021 ()2-s2.0-85028923057 (Scopus ID)
Note

QC 20190325

Available from: 2019-03-25 Created: 2019-03-25 Last updated: 2019-03-25Bibliographically approved
Liu, D., Fodor, V. & Rasmussen, L. K. (2019). Will Scale-Free Popularity Develop Scale-Free Geo-Social Networks?. IEEE Transactions on Network Science and Engineering, 6(3), 587-598
Open this publication in new window or tab >>Will Scale-Free Popularity Develop Scale-Free Geo-Social Networks?
2019 (English)In: IEEE Transactions on Network Science and Engineering, Vol. 6, no 3, p. 587-598Article in journal (Refereed) Published
Abstract [en]

Empirical results show that spatial factors such as distance, population density and communication range affect our social activities, also reflected by the development of ties in social networks. This motivates the need for social network models that take these spatial factors into account. Therefore, in this paper we propose a gravity-low-based geo-social network model, where connections develop according to the popularity of the individuals, but are constrained through their geographic distance and the surrounding population density. Specifically, we consider a power-law distributed popularity, and random node positions governed by a Poisson point process. We evaluate the characteristics of the emerging networks, considering the degree distribution, the average degree of neighbors and the local clustering coefficient. These local metrics reflect the robustness of the network, the information dissemination speed and the communication locality. We show that unless the communication range is strictly limited, the emerging networks are scale-free, with a rank exponent affected by the spatial factors. Even the average neighbor degree and the local clustering coefficient show tendencies known in non-geographic scale-free networks, at least when considering individuals with low popularity. At high-popularity values, however, the spatial constraints lead to popularity-independent average neighbor degrees and clustering coefficients.

National Category
Computer Systems
Identifiers
urn:nbn:se:kth:diva-258825 (URN)10.1109/TNSE.2018.2841942 (DOI)000484296800027 ()2-s2.0-85047804112 (Scopus ID)
Note

QC 20190926

Available from: 2019-09-10 Created: 2019-09-10 Last updated: 2019-09-26Bibliographically approved
Ciftci, B., Gross, J., Norrga, S., Kildehöj, L. & Nee, H.-P. (2018). A Proposal for Wireless Control of Submodules in Modular Multilevel Converters. In: : . Paper presented at 20th European Conference on Power Electronics and Applications.
Open this publication in new window or tab >>A Proposal for Wireless Control of Submodules in Modular Multilevel Converters
Show others...
2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The modular multilevel converter is one of the most preferred converters for high-power conversion applications. Wireless control of the submodules can contribute to its evolution by lowering the material and labor costs of cabling and by increasing the availability of the converter. However, wireless control leads to many challenges for the control and modulation of the converter as well as for proper low-latency high-reliability communication. This paper investigates the tolerable asynchronism between phase-shifted carriers used in modulation from a wireless control point of view and proposes a control method along with communication protocol for wireless control. The functionality of the proposed method is validated by computer simulations in steady state.

Keywords
Modular multilevel converter, Wireless control
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-239736 (URN)000450299300223 ()2-s2.0-85057065852 (Scopus ID)9789075815290 (ISBN)
Conference
20th European Conference on Power Electronics and Applications
Note

QC 20181203

Available from: 2018-12-02 Created: 2018-12-02 Last updated: 2018-12-10Bibliographically approved
Li, N., Xiao, M. & Rasmussen, L. K. (2018). Diverse Communication Modes in Cooperative Downlink Non-Orthogonal Multiple Access - Invited Paper. In: IEEE Vehicular Technology Conference: . Paper presented at 87th IEEE Vehicular Technology Conference, VTC Spring 2018, 3 June 2018 through 6 June 2018 (pp. 1-5). Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>Diverse Communication Modes in Cooperative Downlink Non-Orthogonal Multiple Access - Invited Paper
2018 (English)In: IEEE Vehicular Technology Conference, Institute of Electrical and Electronics Engineers Inc. , 2018, p. 1-5Conference paper, Published paper (Refereed)
Abstract [en]

We consider cooperation in downlink non-orthogonal multiple access (NOMA) in a network supporting diverse communication modes. One user (UE2) exists as a potential relay between a base station (BS) and another user (UE1). With relaying the signal for UE1, UE2 obtains the opportunity for its own transmission to UE3 in D2D mode, meanwhile maintaining the transmission efficiency for UE1. On the basis of supporting different communication modes, we propose a NOMA-based cooperation scheme at UE2 to combine the relay message with its own. We derive achievable rate regions for two cases depending on the status of the Rayleigh fading channel of the UE2. We find solutions based on experiments through the transmit power allocation strategy at the UE2 and(/or) the BS. We show the impacts of our cooperative scheme and the corresponding user geometry on the achievable rates and the resource sharing strategies. © 2018 IEEE.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2018
Keywords
Fading channels, Rayleigh fading, Achievable rate region, Communication mode, Cooperative schemes, Diverse communications, Non orthogonal multiple accesses (NOMA), Non-orthogonal multiple access, Transmission efficiency, Transmit power allocation, Cooperative communication
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-238072 (URN)10.1109/VTCSpring.2018.8417569 (DOI)2-s2.0-85050976186 (Scopus ID)9781538663554 (ISBN)
Conference
87th IEEE Vehicular Technology Conference, VTC Spring 2018, 3 June 2018 through 6 June 2018
Note

Conference code: 138181; Export Date: 30 October 2018; Conference Paper; CODEN: IVTCD

QC 20190114

Available from: 2019-01-14 Created: 2019-01-14 Last updated: 2019-01-14Bibliographically approved
Li, N., Xiao, M. & Rasmussen, L. K. (2018). Optimized Cooperative Multiple Access in Industrial Cognitive Networks. IEEE Transactions on Industrial Informatics, 14(6), 2666-2676
Open this publication in new window or tab >>Optimized Cooperative Multiple Access in Industrial Cognitive Networks
2018 (English)In: IEEE Transactions on Industrial Informatics, ISSN 1551-3203, E-ISSN 1941-0050, Vol. 14, no 6, p. 2666-2676Article in journal (Refereed) Published
Abstract [en]

We consider optimized cooperation in joint orthogonal multiple access and nonorthogonal multiple access in industrial cognitive networks, in which lots of devices may have to share spectrum and some devices (e.g., those for critical control devices) have higher transmission priority, known as primary users. We consider one secondary transmitter (less important devices) as a potential relay between a primary transmitter and receiver pair. The choice of cooperation scheme differs in terms of use cases. With decode-and-forward relaying, the channel between the primary and secondary users limits the achievable rates especially when it experiences poor channel conditions. To alleviate this problem, we apply analog network coding to directly combine the received primary message for relaying with the secondary message. We find achievable rate regions for these two schemes over Rayleigh fading channels. We then investigate an optimization problem jointly considering orthogonalmultiple access and nonorthogonal multiple access, where the secondary rate is maximized under the constraint of maintaining the primary rate. We find both analytical solutions as well as solutions based on experiments through the time sharing strategy between the primary and secondary system and the transmit power allocation strategy at the secondary transmitter. We show the performance improvements of exploiting analog network coding and the impacts of cooperative schemes and user geometry on achievable rates and resource sharing strategies.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2018
Keywords
Analog network coding, industrial cooperative networks, nonorthogonal multiple access, optimization, spectrum sharing
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-231205 (URN)10.1109/TII.2017.2788428 (DOI)000434297100034 ()2-s2.0-85041177610 (Scopus ID)
Note

QC 20180629

Available from: 2018-06-29 Created: 2018-06-29 Last updated: 2018-06-29Bibliographically approved
Li, N., Rasmussen, L. K. & Xiao, M. (2018). Performance Analysis of Cognitive User Cooperation Using Binary Network Coding. IEEE Transactions on Vehicular Technology, 67(8), 7355-7369
Open this publication in new window or tab >>Performance Analysis of Cognitive User Cooperation Using Binary Network Coding
2018 (English)In: IEEE Transactions on Vehicular Technology, ISSN 0018-9545, E-ISSN 1939-9359, Vol. 67, no 8, p. 7355-7369Article in journal (Refereed) Published
Abstract [en]

We consider a cognitive radio network where a primary and a secondary transmitter, respectively, communicate a message to their primary and secondary receivers over a packet-based wireless link, using a joint automatic-repeat-request (ARQ) error control scheme. The secondary transmitter assists in the retransmission of the primary message, which improves the primary performance, and as a reward it is granted limited access to the transmission resources. Conventional ARQ, as well as two network-coding schemes are investigated for applications in the retransmission phase; namely the static network-coding scheme and the adaptive network-coding scheme. For each scheme we analyze the transmission process by investigating the distribution of the number of transmission attempts. We divide every frame into three transmission sessions and in each session we discover that the number of transmission attempts follows a certain negative binomial distribution, in which case can be further approximated by a normal distribution. Considering both the cases of an adaptive frame size and a truncated frame size, we derive analytical results on system performances and discuss the comparison of three schemes. Besides, the approximation method greatly reduces the complexity of transmission analysis, especially in the truncated frame-size case. Numerical results show that our analysis are valid and closely match the simulations.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2018
Keywords
Cognitive radio, cooperation, network coding, performance analysis
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-234618 (URN)10.1109/TVT.2018.2833494 (DOI)000441788300050 ()2-s2.0-85046448645 (Scopus ID)
Note

QC 20180913

Available from: 2018-09-13 Created: 2018-09-13 Last updated: 2018-09-13Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7182-9543

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