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Publications (10 of 456) Show all publications
He, S., Wang, J., Huang, Y., Ottersten, B. & Hong, W. (2017). Codebook-Based Hybrid Precoding for Millimeter Wave Multiuser Systems. IEEE Transactions on Signal Processing, 65(20), 5289-5304
Open this publication in new window or tab >>Codebook-Based Hybrid Precoding for Millimeter Wave Multiuser Systems
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2017 (English)In: IEEE Transactions on Signal Processing, ISSN 1053-587X, E-ISSN 1941-0476, Vol. 65, no 20, p. 5289-5304Article in journal (Refereed) Published
Abstract [en]

In millimeter-wave (mmWave) systems, antenna architecture limitations make it difficult to apply conventional fully digital precoding techniques but call for low-cost analog radio frequency (RF) and digital baseband hybrid precoding methods. This paper investigates joint RF-baseband hybrid precoding for the downlink of multiuser multiantenna mmWave systems with a limited number of RF chains. Two performance measures, maximizing the spectral efficiency and the energy efficiency of the system, are considered. We propose a codebook-based RF precoding design and obtain the channel state information via a beam sweep procedure. Via the codebook-based design, the original system is transformed into a virtual multiuser downlink system with the RF chain constraint. Consequently, we are able to simplify the complicated hybrid precoding optimization problems to joint codeword selection and precoder design (JWSPD) problems. Then, we propose efficient methods to address the JWSPD problems and jointly optimize the RF and baseband precoders under the two performance measures. Finally, extensive numerical results are provided to validate the effectiveness of the proposed hybrid precoders.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2017
Keyword
Hybrid precoding design, millimeter wave communication, energy efficient communication, successive convex approximation, power allocation
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-213755 (URN)10.1109/TSP.2017.2723353 (DOI)000407465900003 ()
Note

QC 20170920

Available from: 2017-09-20 Created: 2017-09-20 Last updated: 2017-09-20Bibliographically approved
Gharanjik, A., Shankar, M. R., Soltanalian, M. & Ottersten, B. (2017). Max-min transmit beamforming via iterative regularization. In: Conference Record - Asilomar Conference on Signals, Systems and Computers: . Paper presented at 50th Asilomar Conference on Signals, Systems and Computers, ACSSC 2016, 6 November 2016 through 9 November 2016 (pp. 1437-1441). IEEE Computer Society
Open this publication in new window or tab >>Max-min transmit beamforming via iterative regularization
2017 (English)In: Conference Record - Asilomar Conference on Signals, Systems and Computers, IEEE Computer Society, 2017, p. 1437-1441Conference paper, Published paper (Refereed)
Abstract [en]

This paper introduces an iterative optimization framework to tackle the multi-group multicast Max-Min transmit beamforming problem. In each iteration, the optimization problem is decomposed into four sub-problems, all of which can be solved using computationally efficient algorithms. The advantage of proposed method lies in its ability to handle different types of signal constraints like total power and unimodularity; a feature not exhibited by other techniques. The proposed technique outperforms the well-known semidefinite relaxation method in terms of quality of solutions.

Place, publisher, year, edition, pages
IEEE Computer Society, 2017
Keyword
Beamforming, Optimization, Computationally efficient, Iterative Optimization, Iterative regularization, Optimization problems, Quality of solution, Semidefinite relaxation, Signal constraints, Transmit beamforming, Iterative methods
National Category
Signal Processing
Identifiers
urn:nbn:se:kth:diva-207984 (URN)10.1109/ACSSC.2016.7869614 (DOI)000406057400253 ()2-s2.0-85016242755 (Scopus ID)9781538639542 (ISBN)
Conference
50th Asilomar Conference on Signals, Systems and Computers, ACSSC 2016, 6 November 2016 through 9 November 2016
Note

QC 20170607

Available from: 2017-06-07 Created: 2017-06-07 Last updated: 2017-11-10Bibliographically approved
Gharanjik, A., Shankar, B., Soltanalian, M. & Ottersten, B. (2016). An iterative approach to nonconvex QCQP with applications in signal processing. In: Proceedings of the IEEE Sensor Array and Multichannel Signal Processing Workshop: . Paper presented at 2016 IEEE Sensor Array and Multichannel Signal Processing Workshop, SAM 2016, 10 July 2016 through 13 July 2016. IEEE
Open this publication in new window or tab >>An iterative approach to nonconvex QCQP with applications in signal processing
2016 (English)In: Proceedings of the IEEE Sensor Array and Multichannel Signal Processing Workshop, IEEE, 2016Conference paper, Published paper (Refereed)
Abstract [en]

This paper introduces a new iterative approach to solve or to approximate the solutions of the nonconvex quadratically constrained quadratic programs (QCQP). First, this constrained problem is transformed to an unconstrained problem using a specialized penalty-based method. A tight upper-bound for the alternative unconstrained objective is introduced. Then an efficient minimization approach to the alternative unconstrained objective is proposed and further studied. The proposed approach involves power iterations and minimization of a convex scalar function in each iteration, which are computationally fast. The important design problem of multigroup multicast beamforming is formulated as a nonconvex QCQP and solved using the proposed method.

Place, publisher, year, edition, pages
IEEE, 2016
Keyword
Constraint theory, Iterative methods, Quadratic programming, Constrained problem, Design problems, Iterative approach, Multi-group, Quadratically-constrained quadratic programs, Scalar function, Unconstrained problems, Upper Bound, Signal processing
National Category
Signal Processing
Identifiers
urn:nbn:se:kth:diva-202884 (URN)10.1109/SAM.2016.7569622 (DOI)2-s2.0-84990829369 (Scopus ID)9781509021031 (ISBN)
Conference
2016 IEEE Sensor Array and Multichannel Signal Processing Workshop, SAM 2016, 10 July 2016 through 13 July 2016
Note

QC 20170310

Available from: 2017-03-10 Created: 2017-03-10 Last updated: 2017-03-10Bibliographically approved
He, S., Huang, Y., Yang, L., Ottersten, B. & Hong, W. (2015). Energy Efficient Coordinated Beamforming for Multicell System: Duality-Based Algorithm Design and Massive MIMO Transition. IEEE Transactions on Communications, 63(12), 4920-4935
Open this publication in new window or tab >>Energy Efficient Coordinated Beamforming for Multicell System: Duality-Based Algorithm Design and Massive MIMO Transition
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2015 (English)In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 63, no 12, p. 4920-4935Article in journal (Refereed) Published
Abstract [en]

In this paper, we investigate joint beamforming and power allocation in multicell multiple-input single-output (MISO) downlink networks. Our goal is to maximize the utility function defined as the ratio between the system weighted sum rate and the total power consumption subject to the users' quality of service requirements and per-base-station (BS) power constraints. The considered problem is nonconvex and its objective is in a fractional form. To circumvent this problem, we first resort to an virtual uplink formulations of the the primal problem by introducing an auxiliary variable and applying the uplink-downlink duality theory. By exploiting the analytic structure of the optimal beamformers in the dual uplink problem, an efficient algorithm is then developed to solve the considered problem. Furthermore, to reduce further the exchange overhead between coordinated BSs in a large-scale antenna system, an effective coordinated power allocation solution only based on statistical channel state information is reached by deriving the asymptotic optimization problem, which is used to obtain the power allocation in a long-term timescale. Numerical results validate the effectiveness of our proposed schemes and show that both the spectral efficiency and the energy efficiency can be simultaneously improved over traditional downlink coordinated schemes, especially in the middle-high transmit power region.

Place, publisher, year, edition, pages
IEEE, 2015
Keyword
Coordinated energy-efficient transmission, uplink-downlink duality, massive multiple-input-single-output system, beamforming and power allocation
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-180995 (URN)10.1109/TCOMM.2015.2496948 (DOI)000366928600024 ()
Note

QC 20160127

Available from: 2016-01-27 Created: 2016-01-26 Last updated: 2017-11-30Bibliographically approved
Gharanjik, A., Shankar, B. M. R., Arapoglou, P.-D. & Ottersten, B. (2015). Multiple Gateway Transmit Diversity in Q/V Band Feeder Links. IEEE Transactions on Communications, 63(3), 916-926
Open this publication in new window or tab >>Multiple Gateway Transmit Diversity in Q/V Band Feeder Links
2015 (English)In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 63, no 3, p. 916-926Article in journal (Refereed) Published
Abstract [en]

Design of high bandwidth and reliable feeder links are central toward provisioning new services on the user link of a multibeam satellite communication system. Toward this, utilization of the Q/V band and an exploitation of multiple gateways (GWs) as a transmit diversity measure for overcoming severe propagation effects are being considered. In this context, this contribution deals with the design of a feeder link comprising N + P GWs (N active and P redundant GWs). Toward provisioning the desired availability, a novel switching scheme is analyzed and practical aspects such as prediction-based switching and switching rate are discussed. Unlike most relevant works, a dynamic rain attenuation model is used to analytically derive average outage probability in the fundamental 1 + 1 GW case. Building on this result, an analysis for the N + P scenario leading to a quantification of the end-to-end performance is provided. This analysis aids system sizing by illustrating the interplay between the number of active and redundant GWs on the chosen metrics: average outage and average switching rate.

National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-164469 (URN)10.1109/TCOMM.2014.2385703 (DOI)000351507600027 ()2-s2.0-84925071135 (Scopus ID)
Note

QC 20150422

Available from: 2015-04-22 Created: 2015-04-17 Last updated: 2017-12-04Bibliographically approved
Gharanjik, A., Bhavani Shankar, M. R., Arapoglou, P. D., Bengtsson, M. & Ottersten, B. (2015). Robust precoding design for multibeam downlink satellite channel with phase uncertainty. In: ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings: . Paper presented at 40th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2015, 19 April 2014 through 24 April 2014 (pp. 3083-3087). IEEE conference proceedings
Open this publication in new window or tab >>Robust precoding design for multibeam downlink satellite channel with phase uncertainty
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2015 (English)In: ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings, IEEE conference proceedings, 2015, p. 3083-3087Conference paper, Published paper (Refereed)
Abstract [en]

n this work, we study the design of a precoder on the user downlink of a multibeam satellite channel. The variations in channel due to phase noise introduced by on-board oscillators and the long round trip delay result in outdated channel information at the transmitter. The phase uncertainty is modelled and a robust design framework is formulated based on availability and power constraints. The optimization problem is cast into the convex paradigm after approximations and the benefits of the resulting precoder are highlighted.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2015
Keyword
Convex optimization, Phase Uncertainty, Robust Precoding, Satellite Channel, SDR
National Category
Signal Processing Telecommunications
Identifiers
urn:nbn:se:kth:diva-181633 (URN)10.1109/ICASSP.2015.7178538 (DOI)2-s2.0-84946080887 (Scopus ID)9781467369978 (ISBN)
Conference
40th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2015, 19 April 2014 through 24 April 2014
Note

QC 20160229

Available from: 2016-02-29 Created: 2016-02-02 Last updated: 2016-02-29Bibliographically approved
Alodeh, M., Chatzinotas, S. & Ottersten, B. E. (2015). Spatial DCT-Based Channel Estimation in Multi-Antenna Multi-Cell Interference Channels. IEEE Transactions on Signal Processing, 63(6), 1404-1418
Open this publication in new window or tab >>Spatial DCT-Based Channel Estimation in Multi-Antenna Multi-Cell Interference Channels
2015 (English)In: IEEE Transactions on Signal Processing, ISSN 1053-587X, E-ISSN 1941-0476, Vol. 63, no 6, p. 1404-1418Article in journal (Refereed) Published
Abstract [en]

This work addresses channel estimation in multiple antenna multicell interference-limited networks. Channel state information (CSI) acquisition is vital for interference mitigation. Wireless networks often suffer from multicell interference, which can be mitigated by deploying beamforming to spatially direct the transmissions. The accuracy of the estimated CSI plays an important role in designing accurate beamformers that can control the amount of interference created from simultaneous spatial transmissions to mobile users. Therefore, a new technique based on the structure of the spatial covariance matrix and the discrete cosine transform (DCT) is proposed to enhance channel estimation in the presence of interference. Bayesian estimation and least squares estimation frameworks are introduced by utilizing the DCT to separate the overlapping spatial paths that create the interference. The spatial domain is thus exploited to mitigate the contamination which is able to discriminate across interfering users. Gains over conventional channel estimation techniques are presented in our simulations which are also valid for a small number of antennas.

Keyword
Channel estimation, discrete cosine transform, second order statistics, training sequence contamination
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-162941 (URN)10.1109/TSP.2015.2393844 (DOI)000350046600005 ()2-s2.0-84923239790 (Scopus ID)
Note

QC 20150402

Available from: 2015-04-02 Created: 2015-03-26 Last updated: 2017-12-04Bibliographically approved
Tsakonas, E., Jaldén, J., Sidiropoulos, N. D. & Ottersten, B. (2014). Convergence of the Huber Regression M-Estimate in the Presence of Dense Outliers. IEEE Signal Processing Letters, 21(11), 1211-1214
Open this publication in new window or tab >>Convergence of the Huber Regression M-Estimate in the Presence of Dense Outliers
2014 (English)In: IEEE Signal Processing Letters, ISSN 1070-9908, E-ISSN 1558-2361, Vol. 21, no 11, p. 1211-1214Article in journal (Refereed) Published
Abstract [en]

We consider the problem of estimating a deterministic unknown vector which depends linearly on noisy measurements, additionally contaminated with (possibly unbounded) additive outliers. The measurement matrix of the model (i.e., the matrix involved in the linear transformation of the sought vector) is assumed known, and comprised of standard Gaussian i.i.d. entries. The outlier variables are assumed independent of the measurement matrix, deterministic or random with possibly unknown distribution. Under these assumptions we provide a simple proof that the minimizer of the Huber penalty function of the residuals converges to the true parameter vector with a root n-rate, even when outliers are dense, in the sense that there is a constant linear fraction of contaminated measurements which can be arbitrarily close to one. The constants influencing the rate of convergence are shown to explicitly depend on the outlier contamination level.

Keyword
Breakdown point (BP), dense outliers, Huber estimator, performance analysis
National Category
Signal Processing
Identifiers
urn:nbn:se:kth:diva-148329 (URN)10.1109/LSP.2014.2329811 (DOI)000338354800001 ()2-s2.0-84903291685 (Scopus ID)
Funder
EU, FP7, Seventh Framework Programme, 228044
Note

QC 20140806

Available from: 2014-08-06 Created: 2014-08-05 Last updated: 2017-12-05Bibliographically approved
He, S., Huang, Y., Yang, L. & Ottersten, B. (2014). Coordinated Multicell Multiuser Precoding for Maximizing Weighted Sum Energy Efficiency. IEEE Transactions on Signal Processing, 62(3), 741-751
Open this publication in new window or tab >>Coordinated Multicell Multiuser Precoding for Maximizing Weighted Sum Energy Efficiency
2014 (English)In: IEEE Transactions on Signal Processing, ISSN 1053-587X, E-ISSN 1941-0476, Vol. 62, no 3, p. 741-751Article in journal (Refereed) Published
Abstract [en]

Energy efficiency optimization of wireless systems has become urgently important due to its impact on the global carbon footprint. In this paper we investigate energy efficient multicell multiuser precoding design and consider a new criterion of weighted sum energy efficiency, which is defined as the weighted sum of the energy efficiencies of multiple cells. This objective is more general than the existing methods and can satisfy heterogeneous requirements from different kinds of cells, but it is hard to tackle due to its sum-of-ratio form. In order to address this non-convex problem, the user rate is first formulated as a polynomial optimization problem with the test conditional probabilities to be optimized. Based on that, the sum-of-ratio form of the energy efficient precoding problem is transformed into a parameterized polynomial form optimization problem, by which a solution in closed form is achieved through a two-layer optimization. We also show that the proposed iterative algorithm is guaranteed to converge. Numerical results are finally provided to confirm the effectiveness of our energy efficient beamforming algorithm. It is observed that in the low signal-to-noise ratio (SNR) region, the optimal energy efficiency and the optimal sum rate are simultaneously achieved by our algorithm; while in the middle-high SNR region, a certain performance loss in terms of the sum rate is suffered to guarantee the weighed sum energy efficiency.

Keyword
Coordinated multicell precoding, energy efficient optimization, sum rate maximization, weighted sum energy efficiency maximization
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-142876 (URN)10.1109/TSP.2013.2294595 (DOI)000330771300019 ()2-s2.0-84893220104 (Scopus ID)
Funder
EU, FP7, Seventh Framework Programme, 228044
Note

QC 20140313

Available from: 2014-03-13 Created: 2014-03-13 Last updated: 2017-12-05Bibliographically approved
Björnson, E., Jorswieck, E., Debbah, M. & Ottersten, B. (2014). Multiobjective Signal Processing Optimization: The way to balance conflicting metrics in 5G systems. IEEE signal processing magazine (Print), 31(6), 14-23
Open this publication in new window or tab >>Multiobjective Signal Processing Optimization: The way to balance conflicting metrics in 5G systems
2014 (English)In: IEEE signal processing magazine (Print), ISSN 1053-5888, E-ISSN 1558-0792, Vol. 31, no 6, p. 14-23Article in journal (Refereed) Published
Abstract [en]

The evolution of cellular networks is driven by the dream of ubiquitous wireless connectivity: any data service is instantly accessible everywhere. With each generation of cellular networks, we have moved closer to this wireless dream; first by delivering wireless access to voice communications, then by providing wireless data services, and recently by delivering a Wi-Fi-like experience with wide-area coverage and user mobility management. The support for high data rates has been the main objective in recent years [1], as seen from the academic focus on sum-rate optimization and the efforts from standardization bodies to meet the peak rate requirements specified in IMT-Advanced. In contrast, a variety of metrics/objectives are put forward in the technological preparations for fifth-generation (5G) networks: higher peak rates, improved coverage with uniform user experience, higher reliability and lower latency, better energy efficiency (EE), lower-cost user devices and services, better scalability with number of devices, etc. These multiple objectives are coupled, often in a conflicting manner such that improvements in one objective lead to degradation in the other objectives. Hence, the design of future networks calls for new optimization tools that properly handle the existence of multiple objectives and tradeoffs between them.

Keyword
Multi objective, Processing optimizations
National Category
Signal Processing
Identifiers
urn:nbn:se:kth:diva-158451 (URN)10.1109/MSP.2014.2330661 (DOI)000346043700006 ()2-s2.0-84908224211 (Scopus ID)
Funder
Swedish Research Council, 2012-228EU, European Research Council, 305123
Note

QC 20150108

Available from: 2015-01-08 Created: 2015-01-08 Last updated: 2017-12-05Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-2298-6774

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