Digital-twin-enabled city-model-aware deep learning for dynamic channel estimation in urban vehicular environments

202211 bckwAccepted ManuscriptRGCPublishe

An enhanced information sharing roadside unit allocation scheme for vehicular networks

202201 bcvcNot applicableRGC15201118, R5007-18Early releaseUpon official publicatio

Feasibility study of physical-layer network coding in 802.11p VANETs

2014 IEEE International Symposium on Information Theory, ISIT 2014, Honolulu, HI, 29-4 July 2014Vehicular Ad-hoc Network (VANET) is expected to play a major role in improving road safety and traffic efficiency in people's daily life. However, the main issue in VANETs remains to be intermittent node connectivity and relatively short contact duration due to the high mobility of vehicles. Physical-layer Network Coding (PNC) that enables data exchange within a much shorter airtime (e.g., twice faster than traditional scheduling) favors the highly-dynamic link condition in vehicular environments and hence appears to be a powerful tool in VANETs. One of the most important challenges in applying PNC to VANETs comes from the Doppler shift due to high-speed vehicle motion, which leads to carrier frequency offset (CFO) and hence introduces inter-carrier interference (ICI) that degrades the bit error rate performance. In this paper, we investigate the impact of motion-induced CFO/ICI on the overall signal detection. In particular, we study whether PNC in VANETs can be made feasible with conventional equalization techniques that suppress the effect of CFO. We found that PNC suffers only a 3 dB SINR penalty in the worst case compared with generic point-to-point (P2P) communications, and generally PNC is feasible in vehicular environments even if the transmission powers of source nodes cannot be finely controlled.Department of Electronic and Information EngineeringRefereed conference pape

An Energy-efficient Region-based RPL Routing Protocol for Low-power and Lossy Networks

Routing plays an important role in the overall architecture of the Internet of Things. IETF has standardized the RPL routing protocol to provide the interoperability for low-power and lossy networks (LLNs). LLNs cover a wide scope of applications, such as building automation, industrial control, healthcare, and so on. LLNs applications require reliable and energy-efficient routing support. Point-To-point (P2P) communication is a fundamental requirement of many LLNs applications. However, traditional routing protocols usually propagate throughout the whole network to discover a reliable P2P route, which requires large amount energy consumption. Again, it is challenging to achieve both reliability and energy-efficiency simultaneously, especially for LLNs. In this paper, we propose a novel energy-efficient region-based routing protocol (ER-RPL), which achieves energy-efficient data delivery without compromising reliability. In contrast of traditional routing protocols where all nodes are required for route discovery, the proposed scheme only requires a subset of nodes to do the job, which is the key of energy saving. Our theoretical analysis and extensive simulation studies demonstrate that ER-RPL has a great performance superiority over two conventional benchmark protocols, i.e., RPL and P2P-RPL

A methodology for studying 802.11p VANET broadcasting performance with practical vehicle distribution

2014-2015 > Academic research: refereed > Publication in refereed journalAccepted ManuscriptRGCPublishe

Efficient 3D road map data exchange for intelligent vehicles in vehicular fog networks

202102 bcwhAccepted ManuscriptRGC15201118Publishe

A survey of inter-flow network coding in wireless mesh networks with unicast traffic

2015-2016 > Academic research: refereed > Publication in refereed journalAccepted ManuscriptRGCOthersDefence Research and Technology Office, SingaporePublishe

Concept of Node Usage Probability for Analysis and Design of Communication Networks

5th International Workshop on Chaos-Fractals Theories and Applications, IWCFTA 2012, Dalian, Liaoning, 18-21 October 2012In this paper we study the performance of communication networks from a network science perspective. We study the traffic performance of scale-free network under shortest path and minimum degree routing. We introduce the node usage probability, which depends on both the network topology and routing algorithm, to characterize the traffic load distribution and show that resource allocation based on the node usage probability outperforms the uniform and degree-based allocation scheme.Department of Electronic and Information EngineeringRefereed conference pape

The feasibility of NOMA in C-V2X

IEEE INFOCOM 2020 - IEEE Conference on Computer Communications Workshops (INFOCOM WKSHPS), Toronto, ON, Canada, 6-9 July 2020202102 bcwhAccepted ManuscriptRGC15201118Publishe