Imperial College London

MissBoyaDi

Faculty of EngineeringDepartment of Computing

Honorary Research Associate
 
 
 
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b.di Website

 
 
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Location

 

Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
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13 results found

Di B, Jennings N, 2021, Privacy-Preserving dialogues between agents: A contract-based incentive mechanism for distributed meeting scheduling, Multi-Agent Systems and Agreement Technologies. EUMAS 2020, Publisher: Springer, Cham

Meeting scheduling (MS) is a practical task in everyday life that involves independent agents with different calendars and preferences. In this paper, we consider the distributed MS problem where the host exchanges private information with each attendee separately. Since each agent aims to protect its own privacy and attend the meeting at a time slot that it prefers, it is necessary to design a distributed scheduling mechanism where the privacy leakage can be minimized and as many agents are satisfied with the outcome as possible. To achieve this, we propose an intelligent two-layer mechanism based on contract theory where the host motivates each agent to reveal its true preferences by providing different rewards without knowing the costs of each agent to attend the meeting. We first model the privacy leakage by measuring the difference between the revealed information of an agent’s calendar and other agents’ prior beliefs. An optimal control problem is then formulated such that the reward function and privacy leakage level can be jointly designed for each agent. Through theoretical analysis, we show that our proposed mechanism guarantees the incentive compatibility with respect to all agents. Compared to the state of the art, empirical evaluations show that our proposed mechanism achieves lower privacy leakage and higher social welfare within a small number of rounds.

Conference paper

Di B, Zhang H, Song L, Li Y, Han Z, Poor HVet al., 2020, Hybrid Beamforming for Reconfigurable Intelligent Surface based Multi-User Communications: Achievable Rates With Limited Discrete Phase Shifts, IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, Vol: 38, Pages: 1809-1822, ISSN: 0733-8716

Journal article

Zhang H, Di B, Chang Z, Liu X, Song L, Han Zet al., 2020, Equilibrium Problems With Equilibrium Constraints Analysis for Power Control and User Scheduling in NOMA Networks, IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, Vol: 69, Pages: 5467-5480, ISSN: 0018-9545

Journal article

Zhang H, Di B, Song L, Han Zet al., 2020, Reconfigurable Intelligent Surfaces Assisted Communications With Limited Phase Shifts: How Many Phase Shifts Are Enough?, IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, Vol: 69, Pages: 4498-4502, ISSN: 0018-9545

Journal article

Zhang Y, Di B, Wang P, Lin J, Song Let al., 2020, HetMEC: Heterogeneous Multi-Layer Mobile Edge Computing in the 6 G Era, IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, Vol: 69, Pages: 4379-4391, ISSN: 0018-9545

Journal article

Di B, Zhang H, Li L, Song L, Li Y, Han Zet al., 2020, Practical Hybrid Beamforming With Finite-Resolution Phase Shifters for Reconfigurable Intelligent Surface Based Multi-User Communications, IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, Vol: 69, Pages: 4563-4568, ISSN: 0018-9545

Journal article

Deng R, Di B, Song L, 2020, How Capacity is Influenced by Ultra-dense LEO Topology in Multi-terminal Satellite Systems?, IEEE Wireless Communications and Networking Conference (IEEE WCNC), Publisher: IEEE, ISSN: 1525-3511

Conference paper

Di B, Song L, Li Y, Li GYet al., 2019, TCM-NOMA: Joint Multi-User Codeword Design and Detection in Trellis-Coded Modulation-Based NOMA for beyond 5G, IEEE Journal on Selected Topics in Signal Processing, Vol: 13, Pages: 766-780, ISSN: 1932-4553

In this paper, we propose a novel non-orthogonal multiple access (NOMA) scheme based on trellis-coded modulation (TCM) techniques. Unlike the traditional code-domain NOMA scheme, we consider to jointly map the incoming data streams of multiple users to a superposed codeword so as to improve the coding gain of the system without any bandwidth extension. Both codeword design and multi-user detection are considered to optimize the TCM for NOMA. For the NOMA encoder, the multi-dimensional (MD) constellation is carefully selected and a new set partitioning algorithm is developed for MD signal set labeling. For joint decoding, a suboptimal two-layer Viterbi algorithm is developed where the non-orthogonal nature is utilized to reduce the complexity. Numerical evaluations have been performed to show that our proposed TCM-based NOMA scheme is superior to the traditional code-domain NOMA and orthogonal frequency division multiple access schemes with high Eb/N0 in terms of the BER performance under the same channel conditions.

Journal article

Di B, Song L, Li Y, Li GYet al., 2017, Non-orthogonal multiple access for high-reliable and low-latency V2X communications in 5G systems, IEEE Journal on Selected Areas in Communications, Vol: 35, Pages: 2383-2897, ISSN: 0733-8716

In this paper, we consider a dense vehicular communication network where eachvehicle broadcasts its safety information to its neighborhood in eachtransmission period. Such applications require low latency and highreliability, and thus, we propose a non-orthogonal multiple access scheme toreduce the latency and to improve the packet reception probability. In theproposed scheme, the BS performs the semi-persistent scheduling to optimize thetime scheduling and allocate frequency resources in a non-orthogonal mannerwhile the vehicles autonomously perform distributed power control. We formulatethe centralized scheduling and resource allocation problem as equivalent to amulti-dimensional stable roommate matching problem, in which the users andtime/frequency resources are considered as disjoint sets of players to bematched with each other. We then develop a novel rotation matching algorithm,which converges to a q-exchange stable matching after a limited number ofiterations. Simulation results show that the proposed scheme outperforms thetraditional orthogonal multiple access scheme in terms of the latency andreliability.

Journal article

Di B, Wang T, Song L, Han Zet al., 2017, Collaborative Smartphone Sensing Using Overlapping Coalition Formation Games, IEEE Transactions on Mobile Computing, Vol: 16, Pages: 30-43, ISSN: 1536-1233

Journal article

Di B, Song L, Li Y, 2016, Sub-Channel Assignment, Power Allocation, and User Scheduling for Non-Orthogonal Multiple Access Networks, IEEE Transactions on Wireless Communications, Vol: 15, Pages: 7686-7698, ISSN: 1536-1276

Journal article

Zhang S, Di B, Song L, Li Yet al., Sub-channel and Power Allocation for Non-orthogonal Multiple Access Relay Networks with Amplify-and-Forward Protocol

In this paper, we study the resource allocation problem for a single-cellnon-orthogonal multiple access (NOMA) relay network where an OFDMamplify-and-forward (AF) relay allocates the spectrum and power resources tothe source-destination (SD) pairs. We aim to optimize the resource allocationto maximize the average sum-rate. The optimal approach requires an exhaustivesearch, leading to an NP-hard problem. To solve this problem, we propose twoefficient many-to-many two-sided SD pair-subchannel matching algorithms inwhich the SD pairs and sub-channels are considered as two sets of playerschasing their own interests. The proposed algorithms can provide a sub-optimalsolution to this resource allocation problem in affordable time. Both thestatic matching algorithm and dynamic matching algorithm converge to apair-wise stable matching after a limited number of iterations. Simulationresults show that the capacity of both proposed algorithms in the NOMA schemesignificantly outperforms the conventional orthogonal multiple access scheme.The proposed matching algorithms in NOMA scheme also achieve a betteruser-fairness performance than the conventional orthogonal multiple access.

Journal article

Di B, Song L, Li Y, Han Zet al., V2X Meets NOMA: Non-Orthogonal Multiple Access for 5G Enabled Vehicular Networks

Benefited from the widely deployed infrastructure, the LTE network hasrecently been considered as a promising candidate to support thevehicle-to-everything (V2X) services. However, with a massive number of devicesaccessing the V2X network in the future, the conventional OFDM-based LTEnetwork faces the congestion issues due to its low efficiency of orthogonalaccess, resulting in significant access delay and posing a great challengeespecially to safety-critical applications. The non-orthogonal multiple access(NOMA) technique has been well recognized as an effective solution for thefuture 5G cellular networks to provide broadband communications and massiveconnectivity. In this article, we investigate the applicability of NOMA insupporting cellular V2X services to achieve low latency and high reliability.Starting with a basic V2X unicast system, a novel NOMA-based scheme is proposedto tackle the technical hurdles in designing high spectral efficient schedulingand resource allocation schemes in the ultra dense topology. We then extend itto a more general V2X broadcasting system. Other NOMA-based extended V2Xapplications and some open issues are also discussed.

Journal article

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