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Publications (10 of 126) Show all publications
Zhang, L., Xiao, M., Wu, G., Alam, M., Liang, Y.-C. & Li, S. (2017). A SURVEY OF ADVANCED TECHNIQUES FOR SPECTRUM SHARING IN 5G NETWORKS. IEEE wireless communications, 24(5), 44-51.
Open this publication in new window or tab >>A SURVEY OF ADVANCED TECHNIQUES FOR SPECTRUM SHARING IN 5G NETWORKS
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2017 (English)In: IEEE wireless communications, ISSN 1536-1284, E-ISSN 1558-0687, Vol. 24, no 5, 44-51 p.Article in journal (Refereed) Published
Abstract [en]

Spectrum efficiency is one of the key performance metrics in 5G communication networks. To enhance spectrum efficiency, advanced spectrum sharing techniques are normally used. In this article, we provide a survey of the recent development of advanced techniques for spectrum sharing. In particular, we elaborate cognitive radio, device-to-device communication, in-band full-duplex communication, non-orthogonal multiple access, and Long Term Evolution on unlicensed spectrum. For each technique, we present the basic principle and research methodology of the state of the art. By considering various promising evolutions in 5G networks, we emphasize challenges to deploy each technique. Finally, we discuss the integration issue of multiple spectrum sharing techniques and identify potential challenges.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2017
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-217758 (URN)10.1109/MWC.2017.1700069 (DOI)000414044700008 ()
Note

QC 20171121

Available from: 2017-11-21 Created: 2017-11-21 Last updated: 2017-11-21Bibliographically approved
Xiao, M., Mumtaz, S., Huang, Y., Dai, L., Li, Y., Matthaiou, M., . . . Ghosh, A. (2017). Millimeter Wave Communications for Future Mobile Networks. IEEE Journal on Selected Areas in Communications, 35(9), 1909-1935.
Open this publication in new window or tab >>Millimeter Wave Communications for Future Mobile Networks
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2017 (English)In: IEEE Journal on Selected Areas in Communications, ISSN 0733-8716, E-ISSN 1558-0008, Vol. 35, no 9, 1909-1935 p.Article in journal (Refereed) Published
Abstract [en]

Millimeter wave (mmWave) communications have recently attracted large research interest, since the huge available bandwidth can potentially lead to the rates of multiple gigabit per second per user. Though mmWave can be readily used in stationary scenarios, such as indoor hotspots or backhaul, it is challenging to use mmWave in mobile networks, where the transmitting/receiving nodes may be moving, channels may have a complicated structure, and the coordination among multiple nodes is difficult. To fully exploit the high potential rates of mmWave in mobile networks, lots of technical problems must be addressed. This paper presents a comprehensive survey of mmWave communications for future mobile networks (5G and beyond). We first summarize the recent channel measurement campaigns and modeling results. Then, we discuss in detail recent progresses in multiple input multiple output transceiver design for mmWave communications. After that, we provide an overview of the solution for multiple access and backhauling, followed by the analysis of coverage and connectivity. Finally, the progresses in the standardization and deployment of mmWave for mobile networks are discussed.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2017
Keyword
Millimeter wave communications, mobile networks, channel model, MIMO beamforming, multiple access, standardization
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:kth:diva-214315 (URN)10.1109/JSAC.2017.2719924 (DOI)000408055300001 ()2-s2.0-85023746035 (Scopus ID)
Note

QC 20170918

Available from: 2017-09-18 Created: 2017-09-18 Last updated: 2018-01-13Bibliographically approved
Xiao, M., Mumtaz, S., Huang, Y., Dai, L., Li, Y., Matthaiou, M., . . . Ghosh, A. (2017). Millimeter Wave Communications for Future Mobile Networks (Guest Editorial), Part I. IEEE Journal on Selected Areas in Communications, 35(7), 1425-1431.
Open this publication in new window or tab >>Millimeter Wave Communications for Future Mobile Networks (Guest Editorial), Part I
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2017 (English)In: IEEE Journal on Selected Areas in Communications, ISSN 0733-8716, E-ISSN 1558-0008, Vol. 35, no 7, 1425-1431 p.Article in journal, Editorial material (Refereed) Published
Place, publisher, year, edition, pages
IEEE, 2017
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-210995 (URN)10.1109/JSAC.2017.2698698 (DOI)000404242600001 ()2-s2.0-85021318479 (Scopus ID)
Note

QC 20170808

Available from: 2017-08-08 Created: 2017-08-08 Last updated: 2017-12-08Bibliographically approved
Zhang, Z., Ma, Z., Xiao, M., Liu, G. & Fan, P. (2017). Modeling and Analysis of Non-Orthogonal MBMS Transmission in Heterogeneous Networks. IEEE Journal on Selected Areas in Communications, 35(10), 2221-2237.
Open this publication in new window or tab >>Modeling and Analysis of Non-Orthogonal MBMS Transmission in Heterogeneous Networks
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2017 (English)In: IEEE Journal on Selected Areas in Communications, ISSN 0733-8716, E-ISSN 1558-0008, Vol. 35, no 10, 2221-2237 p.Article in journal (Refereed) Published
Abstract [en]

Multimedia broadcast/multicast service (MBMS) transmission, which distributes the media content to multiple users on the same radio resources by using point-to-multipoint communications, is a highly spectrum efficient mechanism for multimedia communications. In this paper, we study the application of power domain non-orthogonal transmission to MBMS enhancements in a K-tier heterogeneous network, in order to satisfy the ever-increasing demands for emerging applications and performance requirements. Then, we present non-orthogonal multi-rate MBMS transmission (NOMRMT) and non-orthogonal multi-service MBMS transmission schemes and investigate their performance by using stochastic geometry. A tractable mode is developed to analyze the performance of asynchronous and synchronous non-orthogonal MBMS transmission. Based on this model, analytical expressions for the signal-to-interference-plusnoise ratio coverage probability, average number of served users, and sum rate are derived. The results demonstrate that non-orthogonal MBMS transmission can achieve better performance than the orthogonal one, while synchronous non-orthogonal MBMS transmission is superior to the asynchronous one.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2017
Keyword
MBMS, non-orthogonal transmission, heterogeneous networks, stochastic geometry
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-214864 (URN)10.1109/JSAC.2017.2724458 (DOI)000410646800004 ()2-s2.0-85023193210 (Scopus ID)
Note

QC 20171024

Available from: 2017-10-24 Created: 2017-10-24 Last updated: 2017-10-24Bibliographically approved
Xue, Q., Fang, X., Xiao, M. & Yan, L. (2017). Multiuser Millimeter Wave Communications With Nonorthogonal Beams. IEEE Transactions on Vehicular Technology, 66(7), 5675-5688.
Open this publication in new window or tab >>Multiuser Millimeter Wave Communications With Nonorthogonal Beams
2017 (English)In: IEEE Transactions on Vehicular Technology, ISSN 0018-9545, E-ISSN 1939-9359, Vol. 66, no 7, 5675-5688 p.Article in journal (Refereed) Published
Abstract [en]

Recently, millimeter-wave (mmWave) and even terahertz wireless (with higher frequency) networks have attracted significant research interests as alternatives to support the formidable growth of wireless communication services. Normally, directional beamforming (BF) is shown as a promising technique to compensate its high path loss. We focus on mmWave communications and assume that both mmWave base stations (MBSs) and user equipments (UEs) can support directional BF. As mmWave spectrum has short wavelength, massive antenna arrays can be deployed at MBSs to form multiple directional beams through BF training. Then, an MBS can transmit simultaneously to multiple UEs (SUEs) with different beams in the networks. However, the beams that serve different SUEs may transmit (almost) in the same path, especially when SUEs are distributed densely. Thus, they are not in perfect orthogonal beams. Due to the leakage of transmission power, the interference among these beams may be severe. To address this problem, typically the MBS could serve these SUEs in time division multiplex. This will degrade the spectral efficiency. In this context, we investigate the effect of nonorthogonal beam interference and then propose two novel solutions (i.e., dynamic beam switching and static beam selection) to coordinate the transmitting beams effectively. Then, an improved downlink multiuser simultaneous transmission scheme is introduced. In the scheme, an MBS can serve multiple SUEs simultaneously with multiple orthogonal and/or nonorthogonal beams to guarantee SUEs' Quality of Service. The theoretical and numerical results have shown that our scheme can largely improve the performance of the achievable rate and, meanwhile, can serve lots of SUEs simultaneously.

Place, publisher, year, edition, pages
IEEE, 2017
Keyword
Interference, millimeter wave (mmWave), multiuser (MU), nonorthogonal beams
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-211611 (URN)10.1109/TVT.2016.2617083 (DOI)000405691700014 ()
Note

QC 20170811

Available from: 2017-08-11 Created: 2017-08-11 Last updated: 2017-08-11Bibliographically approved
Zhang, Z., Ma, Z., Xiao, Y., Xiao, M., Karagiannidis, G. K. & Fan, P. (2017). Non-Orthogonal Multiple Access for Cooperative Multicast Millimeter Wave Wireless Networks. IEEE Journal on Selected Areas in Communications, 35(8), 1794-1808.
Open this publication in new window or tab >>Non-Orthogonal Multiple Access for Cooperative Multicast Millimeter Wave Wireless Networks
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2017 (English)In: IEEE Journal on Selected Areas in Communications, ISSN 0733-8716, E-ISSN 1558-0008, Vol. 35, no 8, 1794-1808 p.Article in journal (Refereed) Published
Abstract [en]

Millimeter wave (mmWave) wireless networks can operate in single-cell point-to-multipoint mode to provide local multicast services efficiently. In this paper, the performance of multicast mmWave wireless networks is studied, through stochastic geometry. Then, the use of power domain non-orthogonal multiple access (NOMA) for enhancing mmWave multicasting is also investigated. Furthermore, we study multicasting in twotier mmWave heterogeneous networks, and propose a novel cooperative NOMA multicast scheme. Analytical expressions for the signal-to-interference-plus-noise ratio coverage probability, the average number of served users, and the sum multicast rate are derived, in order to assess the performance of these schemes. Finally, we discuss the maximum sum multicast rates, by formulating them as optimization problems, and also develop efficient golden section search algorithms to solve them. The offered solutions reveal the impact of data transmission rate and power allocation on the sum multicast rate. Both analytical and numerical results demonstrate that NOMA can significantly improve the mmWave multicasting, while the proposed cooperative NOMA mmWave multicast scheme can further improve the NOMA mmWave multicasting.

Place, publisher, year, edition, pages
IEEE, 2017
Keyword
Non-orthogonal multiple access, multicast transmission, millimeter wave communications, stochastic geometry
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-211594 (URN)10.1109/JSAC.2017.2710918 (DOI)000405719300009 ()
Note

QC 20170815

Available from: 2017-08-15 Created: 2017-08-15 Last updated: 2017-08-15Bibliographically approved
Zhang, L., Liu, J., Xiao, M., Wu, G., Liang, Y.-C. & Li, S. (2017). Performance Analysis and Optimization in Downlink NOMA Systems With Cooperative Full-Duplex Relaying. IEEE Journal on Selected Areas in Communications, 35(10), 2398-2412.
Open this publication in new window or tab >>Performance Analysis and Optimization in Downlink NOMA Systems With Cooperative Full-Duplex Relaying
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2017 (English)In: IEEE Journal on Selected Areas in Communications, ISSN 0733-8716, E-ISSN 1558-0008, Vol. 35, no 10, 2398-2412 p.Article in journal (Refereed) Published
Abstract [en]

We study a downlink non-orthogonal multiple access system with cooperative full-duplex relaying, where the near user in terms of the base station (BS) is enabled to act as a full-duplex relay for the far user. In particular, we first derive the outage probability and ergodic sum rate with closed-form expressions when the power allocations at the BS and relay (or the near user) are fixed. Then, we analytically obtain the optimal power allocations with closed-form expressions at the BS and relay to minimize the outage probability. Furthermore, by taking the fairness between the near user and far user into account, we characterize the optimal power allocations with closed-form expressions at the BS and relay to maximize the minimum achievable rate of users. Simulation results validate the correctness of the theoretical analysis and demonstrate the advantages of the proposed algorithms over the state of the art.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2017
Keyword
Achievable rate, cooperative relaying, full-duplex, NOMA, outage probability
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-214865 (URN)10.1109/JSAC.2017.2724678 (DOI)000410646800016 ()2-s2.0-85023170744 (Scopus ID)
Note

QC 20171024

Available from: 2017-10-24 Created: 2017-10-24 Last updated: 2017-10-24Bibliographically approved
Song, K., Ji, B., Huang, Y., Xiao, M. & Yang, L. (2017). Performance Analysis of Heterogeneous Networks With Interference Cancellation. IEEE Transactions on Vehicular Technology, 66(8), 6969-6981.
Open this publication in new window or tab >>Performance Analysis of Heterogeneous Networks With Interference Cancellation
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2017 (English)In: IEEE Transactions on Vehicular Technology, ISSN 0018-9545, E-ISSN 1939-9359, Vol. 66, no 8, 6969-6981 p.Article in journal (Refereed) Published
Abstract [en]

The performance of heterogeneous networks (HetNets) is investigated with both direct and relay-aided transmission strategies in a macrocell. We first propose an interference cancelation scheme at the macro base station on the basis of canceling cross-tier interferences from the macro base station to small-cell users. Then, expressions of the probability density function (PDF) and cumulative distribution function (CDF) of all receivers in both macro and small cells are derived, and the closed-form overall outage probability, average bit error rate (BER), and spectral efficiency of the network are obtained. Based on the derivations, we propose two adaptive relay-aided transmission schemes with instantaneous and statistical channel state information (CSI) to further improve the spectral efficiency. We show that the SNR boost at the small-cell mobile station comes from the cancelation of the cross-layer interference by the macro base station. Therefore, the performance of the small cell is improved greatly with interference cancelation, while the overall performance of the HetNet is also ameliorated. The numerical results finally show the validity of our analysis.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2017
Keyword
Amplify-and-forward relay, bit error rate (BER), heterogeneous network, outage probability
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-213805 (URN)10.1109/TVT.2017.2663898 (DOI)000407686300030 ()
Note

QC 20170913

Available from: 2017-09-13 Created: 2017-09-13 Last updated: 2017-09-13Bibliographically approved
Bao, J., Ma, Z., Xiao, M., Tsiftsis, T. A. & Zhu, Z. (2017). Performance analysis of uplink sparse code multiple access with iterative multiuser receiver. In: IEEE International Conference on Communications: . Paper presented at 2017 IEEE International Conference on Communications, ICC 2017, 21 May 2017 through 25 May 2017. Institute of Electrical and Electronics Engineers Inc..
Open this publication in new window or tab >>Performance analysis of uplink sparse code multiple access with iterative multiuser receiver
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2017 (English)In: IEEE International Conference on Communications, Institute of Electrical and Electronics Engineers Inc. , 2017Conference paper, Published paper (Refereed)
Abstract [en]

This paper investigates the asymptotic performance of bit-interleaved coded modulation (BICM) with iterative multiuser detection and decoding in uplink sparse code multiple access (SCMA) systems. The extrinsic information transfer (EXIT) characteristics analysis of the joint multiuser detector for SCMA is provided, and shows that the average detection reliability for multiple users converges to the single-user case, if ideal feedback from the decoder is available to the detector. We develop a tight analytical bound on the convolutionally encoded bit-error rate (BER) for independent Rayleigh fadings, based on the single-user bound with arbitrary multidimensional constellations. Moreover, we analyze the achievable coding and diversity gains of the SCMA-BICM system with iterative receiver. Simulations are carried out to verify the effectiveness of the analysis.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2017
National Category
Telecommunications Communication Systems
Identifiers
urn:nbn:se:kth:diva-216271 (URN)10.1109/ICC.2017.7996537 (DOI)2-s2.0-85028362700 (Scopus ID)9781467389990 (ISBN)
Conference
2017 IEEE International Conference on Communications, ICC 2017, 21 May 2017 through 25 May 2017
Note

QC 20171215

Available from: 2017-12-15 Created: 2017-12-15 Last updated: 2017-12-15Bibliographically approved
Du, R., Fischione, C. & Xiao, M. (2017). Poster: On the Immortality of Wireless Sensor Networks by Wireless Energy Transfer - A Node Deployment Perspective. In: Proceedings of International Conference on Embedded Wireless Systems and Networks: . Paper presented at International Conference on Embedded Wireless Systems and Networks (EWSN) 2017. .
Open this publication in new window or tab >>Poster: On the Immortality of Wireless Sensor Networks by Wireless Energy Transfer - A Node Deployment Perspective
2017 (English)In: Proceedings of International Conference on Embedded Wireless Systems and Networks, 2017Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

The lifetime of wireless sensor networks (WSNs) can be substantially extended by transferring energy wirelessly to the sensor nodes. In this poster, a wireless energy transfer (WET) enabled WSN is presented, where a base station transfers energy wirelessly to the sensor nodes that are deployed in several regions of interest, to supply them with energy to sense and to upload data. The WSN lifetime can be extended by deploying redundant sensor nodes, which allows the implementation of duty-cycling mechanisms to reduce nodes' energy consumption. In this context, a problem on sensor node deployment naturally arises, where one needs to determine how many sensor nodes to deploy in each region such that the total number of nodes is minimized, and the WSN is immortal. The problem is formulated as an integer optimization, whose solution is challenging due to the binary decision variables and a non-linear constraint. A greedy-based algorithm is proposed to achieve the optimal solution of such deployment problem. It is argued  that such scheme can be used in monitoring systems in smart cities, such as smart buildings and water lines.

National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-199615 (URN)
Conference
International Conference on Embedded Wireless Systems and Networks (EWSN) 2017
Note

QC 20170116

Available from: 2017-01-11 Created: 2017-01-11 Last updated: 2017-01-16Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-5407-0835

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