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Ma, Zheng
Publications (8 of 8) Show all publications
Dai, B., Yu, L., Liu, X. & Ma, Z. (2019). Feedback Coding Schemes for the Broadcast Channel With Mutual Secrecy Requirement at the Receivers. IEEE Transactions on Communications, 67(9), 6039-6052
Open this publication in new window or tab >>Feedback Coding Schemes for the Broadcast Channel With Mutual Secrecy Requirement at the Receivers
2019 (English)In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 67, no 9, p. 6039-6052Article in journal (Refereed) Published
Abstract [en]

The broadcast channel with mutual secrecy requirement at the receivers (BC-MSR-R) is a basic model characterizing the physical layer security (PLS) in the down-link of the wireless communication systems, where one transmitter sends two independent messages to two receivers via a broadcast channel, and each receiver can successfully decode his/her intended message and wishes to overhear the other one's message. This paper studies how to enhance the already existing secrecy rate region of the BC-MSR-R via receivers' feedback. Specifically, we propose two feedback strategies for the BC-MSR-R, where one uses the feedback to generate pure secret keys protecting the transmitted messages, and the other uses the feedback to generate not only keys but also cooperative messages helping the receivers to improve their decoding performance. Different inner bounds on the secrecy capacity region of the BC-MSR-R with noiseless feedback are constructed according to different feedback strategies, and these bounds are further illustrated by a Dueck-type example.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2019
Keywords
Broadcast channel, confidential message, feedback, secrecy capacity region
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-261977 (URN)10.1109/TCOMM.2019.2924206 (DOI)000487048400010 ()
Note

QC 20191014

Available from: 2019-10-14 Created: 2019-10-14 Last updated: 2019-10-14Bibliographically approved
Liu, G., Chen, X., Ma, Z., Zhang, X., Xiao, M. & Fan, P. (2019). Full-Duplex and C-RAN Based Multi-Cell Non-Orthogonal Multiple Access over 5G Wireless Networks. 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; 20-24 May 2019. Institute of Electrical and Electronics Engineers (IEEE), Article ID 8761250.
Open this publication in new window or tab >>Full-Duplex and C-RAN Based Multi-Cell Non-Orthogonal Multiple Access over 5G Wireless Networks
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2019 (English)In: ICC 2019 - 2019 IEEE International Conference on Communications (ICC), Institute of Electrical and Electronics Engineers (IEEE), 2019, article id 8761250Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, we propose the full-duplex and cloud radio access network (C-RAN) based multi-cell non-orthogonal multiple access schemes over 5G mobile wireless networks. To cope with the severe intra-cell and inter-cell interferences as well as perform the centralized optimization, we adopt the C-RAN architecture, where the baseband processing and resource management are conducted at a central unit (CU). With the goal of maximizing the weighted sum achievable rate, we formulate the sum rate maximization power allocation problem as a non-convex problem. Thanks to the hidden monotonicity structure of the considered problem, the optimal power allocation algorithm is developed by the monotonic optimization method. Besides, we propose another suboptimal algorithm by employing successive convex approximation method to obtain the close-to-optimal solution with a significantly reduced computational complexity. Extensive simulations are conducted to verify the effectiveness of our proposed power allocation schemes, and confirm the superiority of our proposed C-RAN architecture.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2019
Series
IEEE International Conference on Communications, ISSN 1550-3607
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-258177 (URN)10.1109/ICC.2019.8761250 (DOI)000492038801053 ()2-s2.0-85070232501 (Scopus ID)9781538680889 (ISBN)
Conference
2019 IEEE International Conference on Communications, ICC 2019; Shanghai International Convention Center, Shanghai; China; 20-24 May 2019
Note

QC 20191002. QC 20191129

Available from: 2019-10-02 Created: 2019-10-02 Last updated: 2019-11-29Bibliographically approved
Liu, H., Lu, J., Liu, T., Hao, L. & Ma, Z. (2019). Generalized Interference Alignment for Multi-cell Cooperative Transmission over Doubly Selective Channels. In: 2019 IEEE 89TH VEHICULAR TECHNOLOGY CONFERENCE (VTC2019-SPRING): . Paper presented at 89th IEEE Vehicular Technology Conference (VTC Spring), APR 28-MAY 01, 2019, Kuala Lumpur, MALAYSIA. IEEE
Open this publication in new window or tab >>Generalized Interference Alignment for Multi-cell Cooperative Transmission over Doubly Selective Channels
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2019 (English)In: 2019 IEEE 89TH VEHICULAR TECHNOLOGY CONFERENCE (VTC2019-SPRING), IEEE , 2019Conference paper, Published paper (Refereed)
Abstract [en]

The paper studies the multi-cell cooperation scheme under the time and frequency doubly selective channels, in which the multi-cell co-channel interference are jointly eliminated with the inter-symbol interference to enhance the transmission reception. The basic idea of interference alignment is exploited, with which the link-level interference and network-level interference are aligned to the same dimension before canceled. Instead of assuming the perfect channel information is available at the receivers, an embedded pilot framework is also proposed to track and update the channel state information every short time period, making the proposed scheme more feasible for practical application. Additionally, the pilot design is also discussed and an optimal embedded pilot scheme is derived.

Place, publisher, year, edition, pages
IEEE, 2019
Series
IEEE Vehicular Technology Conference Proceedings, ISSN 1550-2252
Keywords
doubly selective channels, interference alignment
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-260222 (URN)10.1109/VTCSpring.2019.8746315 (DOI)000482655600029 ()2-s2.0-85068966108 (Scopus ID)978-1-7281-1217-6 (ISBN)
Conference
89th IEEE Vehicular Technology Conference (VTC Spring), APR 28-MAY 01, 2019, Kuala Lumpur, MALAYSIA
Available from: 2019-09-30 Created: 2019-09-30 Last updated: 2019-09-30Bibliographically approved
Shen, Z., Liu, G., Ding, Z., Xiao, M., Ma, Z. & Yu, F. R. (2019). Optimal Power Allocations for 5G Non-Orthogonal Multiple Access with Half/Full Duplex Relaying. In: ICC 2019 - 2019 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC): . Paper presented at IEEE International Conference on Communications (ICC), MAY 20-24, 2019, Shanghai, PEOPLES R CHINA. IEEE
Open this publication in new window or tab >>Optimal Power Allocations for 5G Non-Orthogonal Multiple Access with Half/Full Duplex Relaying
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2019 (English)In: ICC 2019 - 2019 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC), IEEE , 2019Conference paper, Published paper (Refereed)
Abstract [en]

Recently, power allocation has attracted more and more attention in order to optimize the performance of nonorthogonal multiple access (NOMA) systems. Different from existing works, the power allocation problems are investigated for cooperative NOMA systems with dedicated amplify-and-forward half-duplex relay (NOMA-HDR) and full-duplex relay (NOMA-FDR). From the fairness standpoint, the power allocation problems are formulated to maximize the minimum achievable user rate in the considered systems. The problems for both NOMA-HDR and NOMA-FDR systems with two-user and M-user are addressed. The closed-form power allocation policy of two-user NOMA-HDR system is obtained. Also, the optimal numerical power allocation policies for two-user NOMA-FDR and M-user NOMA-HDR systems are obtained. In addition, the problem for M-user NOMA-FDR systems is solved in noise-limited environment. Simulation results show that the proposed NOMA-HDR or NOMA-FDR scheme with power adaption clearly outperforms the NOMA-HDR or NOMA-FDR scheme with fixed power allocation. Besides, when the residual self-interference channel gain is small, the performance of NOMA-FDR system is better than the NOMA-HDR system.

Place, publisher, year, edition, pages
IEEE, 2019
Series
IEEE International Conference on Communications, ISSN 1550-3607
Keywords
5G, NOMA, HDR/FDR, power allocation
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-264169 (URN)10.1109/ICC.2019.8761923 (DOI)000492038805048 ()2-s2.0-85070207596 (Scopus ID)978-1-5386-8088-9 (ISBN)
Conference
IEEE International Conference on Communications (ICC), MAY 20-24, 2019, Shanghai, PEOPLES R CHINA
Note

QC 20191129

Available from: 2019-11-29 Created: 2019-11-29 Last updated: 2019-11-29Bibliographically approved
Chen, X., Liu, G., Ma, Z., Zhang, X., Xu, W. & Fan, P. (2019). Optimal Power Allocations for Non-Orthogonal Multiple Access Over 5G Full/Half-Duplex Relaying Mobile Wireless Networks. IEEE Transactions on Wireless Communications, 18(1), 77-92
Open this publication in new window or tab >>Optimal Power Allocations for Non-Orthogonal Multiple Access Over 5G Full/Half-Duplex Relaying Mobile Wireless Networks
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2019 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 18, no 1, p. 77-92Article in journal (Refereed) Published
Abstract [en]

This paper investigates the power allocation problems for non-orthogonal multiple access with coordinated direct and relay transmission (CDRT-NOMA), where a base station (BS) communicates with its nearby user directly, while communicating with its far user only through a dedicated relay node (RN). The RN is assumed to operate in either half-duplex relaying (HDR) mode or full-duplex relaying (FDR) mode. Based on instantaneous channel state information (CSI), the dynamic power allocation problems under HDR and FDR schemes are formulated respectively, with the objective of maximizing the minimum user achievable rate. After demonstrating the quasi-concavity of the considered problems, we derive the optimal closed-form power allocation policies under the HDR scheme and the FDR scheme. Then, a hybrid relaying scheme dynamically switching between HDR and FDR schemes is further designed. Moreover, we also study the fixed power allocation problems for the considered CDRT-NOMA systems based on statistical CSI so as to optimize the long-term system performance. The simulations show that our proposed power allocation policies can significantly enhance the performance of CDRT-NOMA systems.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2019
Keywords
NOMA, coordinated direct and relay transmission, full-duplex relay, power allocation
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-243965 (URN)10.1109/TWC.2018.2876526 (DOI)000456139200006 ()2-s2.0-85055691739 (Scopus ID)
Note

QC 20190301

Available from: 2019-03-01 Created: 2019-03-01 Last updated: 2019-03-01Bibliographically approved
Pan, G., Diamantoulakis, P. D., Ma, Z., Ding, Z. & Karagiannidis, G. K. (2019). Simultaneous Lightwave Information and Power Transfer: Policies, chniques and Future Directions. IEEE Access, 7, 28250-28257, Article ID 8653294.
Open this publication in new window or tab >>Simultaneous Lightwave Information and Power Transfer: Policies, chniques and Future Directions
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2019 (English)In: IEEE Access, E-ISSN 2169-3536, Vol. 7, p. 28250-28257, article id 8653294Article in journal (Refereed) Published
Abstract [en]

Harvesting energy from the surrounding environment is an important and practical solution to prolong the life of the energy-constrained Internet-of-Things (IoT) devices, e.g., wireless sensors. Visible light communications (VLC) has been proved able to provide high-speed data links while meeting the illumination requirement. Thereby, the energy of VLC signals may be harvested by the energy-constrained IoT terminals, such as indoor sensors and portable/wearable devices. This paper presents the concept of simultaneous lightwave information and power transfer (SLIPT) with a particular focus on the design of the receiver and the practical methods to realize SLIPT in the domains of time, signal components, and photoelectric converters. Furthermore, this paper also introduces the applications of SLIPT to various network topologies and communication technologies, e.g., multiple input multiple output, hybrid VLC-radio frequency, and secure communications. Finally, a detailed discussion of future research directions and challenges for the design of SLIPT systems is also presented.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2019
Keywords
Cooperative communications, energy harvesting, secure communications, simultaneous lightwave information and power transfer, visible light communication
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-248361 (URN)10.1109/ACCESS.2019.2901855 (DOI)000461870800001 ()2-s2.0-85063275368 (Scopus ID)
Note

QC 20190405

Available from: 2019-04-05 Created: 2019-04-05 Last updated: 2019-04-05Bibliographically approved
Chen, X., Liu, G., Ma, Z., Zhang, X., Fan, P., Chen, S. & Yu, F. R. (2019). WHEN FULL DUPLEX WIRELESS MEETS NON-ORTHOGONAL MULTIPLE ACCESS: OPPORTUNITIES AND CHALLENGES. IEEE wireless communications, 26(4), 148-155
Open this publication in new window or tab >>WHEN FULL DUPLEX WIRELESS MEETS NON-ORTHOGONAL MULTIPLE ACCESS: OPPORTUNITIES AND CHALLENGES
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2019 (English)In: IEEE wireless communications, ISSN 1536-1284, E-ISSN 1558-0687, Vol. 26, no 4, p. 148-155Article in journal (Refereed) Published
Abstract [en]

NOMA is a promising radio access technology for 5G wireless systems. The core of NOMA is to support multiple users in the same resource block via power or code domain multiplexing, which provides great enhancement in spectrum efficiency and connectivity. Meanwhile, with the recent advance in self-interference (SI) cancelation techniques, FD wireless communication has become a feasible technology enabling radios to receive and transmit simultaneously. This article aims to investigate the combination of these two emerging technologies. At first, several typical scenarios and protocols are presented to illustrate the application of the FD technique in NOMA systems. Then, a novel NOMA system with FD base stations (BSs) based on C-RAN is proposed. Furthermore, power allocation policies are discussed for the proposed scheme, and simulation results are provided to demonstrate its superiority. Finally, challenges and research opportunities of FD NOMA systems are also identified to stimulate future research.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2019
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-259459 (URN)10.1109/MWC.2019.1800369 (DOI)000482599400022 ()2-s2.0-85070718061 (Scopus ID)
Note

QC 20190920

Available from: 2019-09-20 Created: 2019-09-20 Last updated: 2019-09-20Bibliographically approved
Zhai, K., Ma, Z. & Lei, X. (2018). Closed-formed distribution for the SINR of MMSE-detected MIMO systems and performance analysis. AEU - International Journal of Electronics and Communications, 97, 16-24
Open this publication in new window or tab >>Closed-formed distribution for the SINR of MMSE-detected MIMO systems and performance analysis
2018 (English)In: AEU - International Journal of Electronics and Communications, ISSN 1434-8411, E-ISSN 1618-0399, Vol. 97, p. 16-24Article in journal (Refereed) Published
Abstract [en]

In this paper, we investigate the error performance of multiple-input multiple-output (MIMO) wireless communications systems using minimum mean-square error (MMSE) detection. Particularly, a new closed-form statistical distribution for the output signal-to-interference-plus-noise ratio (SINR) of MMSE receiver is derived, for independent Rayleigh fading channels. The expression for the distribution of SINR is shown to be a linear combination of gamma distributions and polynomial of where xis the SINR. Base on the derived distribution for the SINR, closed-form and approximated expressions for the symbol error probability (SEP) of quadrature amplitude modulation (QAM) and phase shift keying (PSK) signaling are obtained, respectively. The derived SINR density and SEP are valid for arbitrary number of transmit and receive antennas. Furthermore, a reduced complexity approximation is introduced to obtain the SINR distribution and SEP performance of MMSE-Detected MIMO Systems with a large number of antennas. The provided simulation results confirm the validity of our theoretical analysis for both the SINR and SEP. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER GMBH, 2018
Keywords
Multiple-input multiple-output (MIMO), Minimum mean square error (MMSE), Signal-to-interference-plus-noise ratio (SINR) distribution, Symbol error probability (SEP)
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-246306 (URN)10.1016/j.aeue.2018.09.038 (DOI)000459837200003 ()2-s2.0-85054459209 (Scopus ID)
Note

QC 20190320

Available from: 2019-03-20 Created: 2019-03-20 Last updated: 2019-03-20Bibliographically approved
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