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| 1 | Mobility-Aware Partial Computation Offloading in Vehicular Networks: A Deep Reinforcement Learning Based Scheme显示文摘Encouraged by next-generation networks and autonomous vehicle systems,vehicular networks must employ advanced technologies to guarantee personal safety,reduce traffic accidents and ease traffic jams.By leveraging the computing ability at the network edge,multi-access edge computing(MEC)is a promising technique to tackle such challenges.Compared to traditional full offloading,partial offloading offers more flexibility in the perspective of application as well as deployment of such systems.Hence,in this paper,we investigate the application of partial computing offloading in-vehicle networks.In particular,by analyzing the structure of many emerging applications,e.g.,AR and online games,we convert the application structure into a sequential multi-component model.Focusing on shortening the application execution delay,we extend the optimization problem from the single-vehicle computing offloading(SVCOP)scenario to the multi-vehicle computing offloading(MVCOP)by taking multiple constraints into account.A deep reinforcement learning(DRL)based algorithm is proposed as a solution to this problem.Various performance evaluation results have shown that the proposed algorithm achieves superior performance as compared to existing offloading mechanisms in deducing application execution delay. | Jianfei Wang Tiejun Lv Pingmu Huang P.Takis Mathiopoulos | 2020 | China Communications2020，17，10： | 7 |
| 2 | Pilot reuse and power control of D2D underlaying massive MIMO systems for energy efficiency optimization显示文摘It is predicted that there will be billions of machine type communication(MTC) devices to be deployed in near future. This will certainly cause severe access congestion and system overload which is one of the major challenges for the proper operation of 5G networks. Adopting device-to-device(D2D) communications into massive multiple-input multiple-output(MIMO) systems has been considered as a potential solution to alleviate the overload of MTC devices by offloading the MTC traffic onto D2 D links. This work proposes a novel pilot reuse(PR) and power control(PC) for energy efficiency(EE) optimization of the uplink D2 D underlaying massive MIMO cellular systems. Although the use of large scale antenna array at the base station(BS) can eliminate most of the D2D-to-Cellular interference, the Cellular-to-D2 D interference and the channel estimation error caused by PR will remain significant. Motivated by this, and in order to reduce the channel estimation error, in this paper a novel heuristic PR optimum pilot reuse scheme is proposed for D2 D transmitters(D2DTs)selection. By taking into account the interference among users as well as the overall power consumption, the overall system EE is maximized through power optimization while maintaining the quality-of-service(Qo S)provisions for both cellular users(CUEs) and D2 D pairs. The power optimization problem is modeled as a non-cooperative game and, as such, a distributed iterative power control algorithm which optimizes users' power sequentially is proposed. Various performance evaluation results obtained by means of computer simulations have shown that the proposed PR scheme and PC algorithm can significantly increase the overall system EE. | Shenghao XU Haixia ZHANG Jie TIAN P.Takis MATHIOPOULOS | 2017 | Science China(Information Sciences)2017，60，10： | 3 |
| 3 | Outage analysis of cognitive two-way relaying networks with SWIPT over Nakagami-m fading channels显示文摘Dear editor,Green wireless communication has attracted the attention of the research community in recent years[1,2].Simultaneous wireless information and power transfer(SWIPT)technique is an attractive research area,since it enables the wireless nodes | Jing YANG Xiqi GAO Shanyang HAN Kostas P.PEPPAS P.Takis MATHIOPOULOS | 2018 | Science China(Information Sciences)2018，61，2： | 2 |
| 4 | Outage Performance of Cognitive DF Relaying Networks Employing SWIPT显示文摘In this paper, the outage performance of a cognitive relaying network over Nakagami-m fading channels, employing simultaneous wireless information and power transfer(SWIPT) technology is analyzed and evaluated. The operation of this network is considered in conjunction with the conventional decode-and-forward(DF) and incremental DF(IDF) protocols. For the conventional DF protocol, it is assumed that there is no direct link between the secondary transmitter(S) and the secondary destination(D), while(for both protocols) after harvesting energy, the relay node(R) always helps to forward the resulting signal to D. However, for the IDF protocol, R assists in relaying S's information to D only when the direct communication between S and D has failed. Furthermore, for both DF and IDF protocols, we assume there is no power supply for R, and R harvests energy from the transmitted signal of S. We derive exact analytical expressions for the outage probability at D in DF and IDF protocols, respectively, in terms of the bivariate Meijer's G-function. Performance evaluation results obtained by means of Monte-Carlo simulations are also provided and have validated the correctness of the proposed analysis. | jing yang yiyun cheng kostas p.peppas p.takis mathiopoulos jie ding | 2018 | China Communications2018，15，4： | 2 |
| 5 | Cooperative DVB-SH Satellite Broadcasting Systems with Rotated Signal Constellations显示文摘In this paper,we study the advantages of cooperation in broadcasting systems from a geosynchronous earth orbit(GEO)satellite to mobile terminals(MTs),achieved through a terrestrial complementary ground station(CGS) with fixed installment,which acts as a relay.Moreover and in the context of the digital video broadcasting-satellite-to-handheld(DVB-SH) standard,the performance improvements offered by the rotated constellations method are investigated,where prior transmission,a phase rotation of the transmitted symbols by a fixed angle is applied followed by a random component interleaver.Turbo codes with soft decision decoding and appropriate random channel interleavers are also considered.We present analytical expressions for the bit log-likelihood ratios(LLRs)that are needed for soft decision decoding at the MT turbo decoder,while the code combining technique is adapted to improve the end-to-end(E2E) performance.Then,we obtain through extensive computer simulations the average bit error probability(ABEP) of quadrature phase-shift keying(QPSK) signals received over pure land-mobile satellite(LMS)and pure CGS links for coding rates 1/3 and6/7.Moreover,the optimal rotation angles are obtained for both links.E2 E ABEP results are then presented assuming cooperation between GEO and CGS,while the power allocation issue is investigated under fixed total transmission power.Our performance evaluation results show that by using the constellation rotation technique,a performance gain can be achieved for high coding rates. | Nikos C.Sagias Stylianos Papaharalabos P.Takis Mathiopoulos | 2015 | China Communications2015，12，6： | 0 |
| 6 | Joint shape and color descriptors for 3D urban model retrieval显示文摘With the rapid development of photogrammetry,computer vision and three-dimensional(3D)modeling technologies,it is possible to efficiently construct detailed 3D urban models.Accordingly,large corpora of 3D models,such as the Google 3D Warehouse,are now becoming freely available on the web.How to find the proper 3D urban models is a challenging research issue.In this paper,we join shape descriptors and color descriptors for 3D urban model retrieval.The query objects are localized and segmented automatically from the input images by using a new selective search voting algorithm.Through combining the normalization with the light field descriptor,the Horizontal Light Descriptor is introduced to measure the shape similarity among the normalized urban models.The color descriptors are used to represent the color information of the urban models.The two types of descriptors are joined to search 3D urban models similar to the query objects.Experimental results have shown the effectiveness of our approach. | Liang Zhang Liqiang Zhang Xiaojing Yao P.Takis Mathiopoulos Chunming Han | 2016 | International Journal of Digital Earth2016，9，11： | 0 |
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