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Institution of Engineering and Technology International Communication Conference on Wireless Mobile and Computing

作者： Shen, Qiang Fang, Xuming Kim, Sunmyeng He, Rong Provincial Key Lab. of Information Coding and Transmission Southwest Jiaotong University Chengdu 610031 China High Performance Network Lab. Institute of Acoustics Chinese Academy of Sciences Beijing 100190 China School of Computer and Software Engineering Kumoh National Institute of Technology Gyeongbuk 730701 Korea Republic of

ISBN: (纸本)9781849191388

Routing in wireless mesh networks presents a great challenge due to unreliable wireless links and collisions. Recently, a new routing method, opportunistic routing (OR), is proposed to deal with them by exploiting broadcast nature of wireless networks. OR relies on the global knowledge of networks to select relays and determine priorities. In this paper, we propose a new routing scheme, OxDSR, which combines OR and dynamic source routing (DSR) and performs opportunistic transmissions with the help of the local information and the traditional route obtained by DSR. By taking the duplicates and additional wireless resource consumed by multiple ACK frames into consideration, we propose a new metric, equivalent data rate, to select and prioritize relays. Extensive simulation study shows that the proposed OxDSR is more resilient and achieves higher throughput than DSR based on the expected transmission count routing metric.

关键词： Medium access control

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Improved complementary sequence keying for wireless infrared communications

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Tiedao Xuebao/Journal of the China Railway Society 2010年第5期32卷 65-69页

作者： Tu, Yi-Feng Fan, Ping-Zhi Yuan, Wei-Na Hao, Li Provincial Key Lab. of Information Coding and Transmission Southwest Jiaotong University Chengdu 610031 China School of Information Science and Engineering East China University of Science and Technology Shanghai 200092 China

Since the unitary spreading sequence which possesses perfect auto-correlation property does not exist, infrared wireless communication systems based on direct sequence spread spectrum suffer severe multipath interference in multipath channels. CSK is proposed as a new modulation scheme, in which BCP is employed as spreading sequences. Because of the perfect auto-correlation property of BCP, CSK can significantly reduce multipath interference. However, CSK does not make full use of the perfect correlation property of BCP, furthermore, selection of appropriate BCP for CSK involves lots of computation when the length of the spreading sequence is relatively long. We propose an improved CSK, in which data streams after spreading by two element sequence of BCP are transmitted via two different subcarriers. The improved CSK can completely eliminate multipath interference and provide simplicity and flexibility to the selection of appropriate BCP. System performance can be enhanced by employing improved CSK. Our conclusions are verified by theoretical analysis and simulation results.

关键词： Signal interference

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Optimal selection of cooperative RAUs in HSR based distributed antenna systems and mobile relay with massive antennas

Optimal selection of cooperative RAUs in HSR based distribut...

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International Workshop on High Mobility Wireless Communications (HMWC)

作者： Ziyue Liu Pingzhi Fan Key Lab of Information Coding and Transmission Southwest Jiaotong University Chengdu China

ISBN: (纸本)9781467376303

This paper studies the performance and designs of high speed railway (HSR) communications that employ massive multiple-input multiple-output (MIMO) systems, where a mobile relay (MR) with a large number of antennas is mounted on the train. The users onboard the train communicate with the ground base station (BS) via MR, i.e. two-hop communications. The distributed antenna system (DAS) is used on ground, where a BS consists of a central unit (CU) and a number of remote antenna units (RAUs) connecting to the CU by optical fiber. The issue of selecting an optimal cooperative RAU set of a linear DAS for railway scenario is addressed. We present a low complexity approach to select a transmit RAU set for capacity maximization, based on the theory of convex optimization. We show via extensive Monte-Carlo simulations that the proposed algorithm provides performance very close to that of optimal selection based on exhaustive search.

关键词： MIMO Antenna arrays Mobile communication Mobile antennas Transmitting antennas Relays

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A novel simple candidate set method for symmetric TSP and its application in MAX-MIN ant system

A novel simple candidate set method for symmetric TSP and it...

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3rd International Conference on Swarm Intelligence, ICSI 2012

作者： Deng, Miao Zhang, Jihong Liang, Yongsheng Lin, Guangming Liu, Wei School of Information Engineering Shenzhen University Shenzhen China Shenzhen Key Lab. of Visual Media Processing and Transmission Shenzhen Institute of Information Technology Shenzhen China

ISBN: (纸本)9783642309755

Traveling Salesman Problem (TSP) is a kind of typical NP problem and has been extensively researched in combinatorial optimization. For solving it more effectively, candidate set is used in many algorithms in order to limit the selecting range when choosing next city to move, such as in Ant Systems, or to initialize a local optimum solution, such as in Lin-Kernighan Heuristic (LKH) algorithm. A novel simple method for generating candidate set is proposed in this paper and applied into MAX-MIN Ant System (MMAS) for symmetric TSP problem. Experimental results show that it has better performance than other Ant Systems including MMAS. Moreover, this method can be used in other algorithms for symmetric TSP problem. © 2012 Springer-Verlag.

关键词： Traveling salesman problem

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A physical layer secure wireless communication scheme for high speed railway

A physical layer secure wireless communication scheme for hi...

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International Workshop on Signal Design and Its Applications in Communications (IWSDA)

作者： Cui Yaping Xuming Fang Key Lab of Information Coding & Transmission Southwest Jiaotong University Chengdu China

The high speed railway wireless communication system is much different from public wireless communication system, because the service is train control messages, which is closely related to the safety of train transportation. Thus it is much demanding to the security and reliability. To guarantee the train control messages delivery security, secrecy capacity and outage probability at the high speed railway scenario under single-stream beamforming are analyzed and show that the security requirements can not been satisfied. Thus a physical layer secure wireless communications scheme under beamforming with artificial noise is proposed for high speed railway. In this scheme, artificial noise is used in the null space of the main channel only to degrade the eavesdropper's channel. Simulation results illustrate the proposed scheme decreases the outage probability under a certain secrecy capacity demand, and meets the secure communication requirements.

关键词： Array signal processing Rail transportation Physical layer Security Wireless communication Capacity planning Safety

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Low correlation zone sequences from interleaved construction

Low correlation zone sequences from interleaved construction

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作者： Parampalli, Udaya Tang, Xiaohu Department of Computer Science and Software Engineering University of Melbourne VIC 3010 Australia Provincial Key Lab of Information Coding and Transmission Institute of Mobile Communications Southwest Jiaotong University Chengdu China

Recently there has been a surge of interest in construction of low correlation zone sequences. The purpose of this paper is to survey the known results in the area and to present an interleaved construction of binary low correlation zone sequences. The interleaved constructionunifies many constructions currently availab.e in the literature. These sequences are useful in quasi-synchronous code-division multiple access (QS-CDMA) communication systems. Copyright © 2010.

关键词： Code division multiple access

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Energy-Spectral Efficiency Tradeoff of Downlink NOMA System with Fairness Consideration

Energy-Spectral Efficiency Tradeoff of Downlink NOMA System ...

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IEEE Vehicular Technology Conference

作者： Dadong Ni Li Hao Xiaomin Qian Quang Thanh Tran Key Lab of Information Coding and Transmission Southwest Jiaotong University Chengdu China

In this paper, we explore the energy efficiency (EE) and spectral efficiency (SE) tradeoff with α-fairness consideration for downlink non-orthogonal multiple access (NOMA) networks based on a multi-objective optimization problem. To acquire the Pareto optimal solution of the original optimization problem, the weighted sum method is adopted to transfer the multi-objective optimization problem to a single-objective optimization problem. The trade-off between SE and EE with fairness considered can be captured through the Pareto optimal solution. Simulation results reveal the achievable SE and EE with same α of NOMA networks outperform that of OFDMA protocol as α is small, and the NOMA networks with more multiplexed users have better performance in EE and SE of NOMA networks as the fairness level among users is higher.

关键词： NOMA Resource management Downlink Multiplexing Pareto optimization Interference

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Prediction of tourists flow distribution based on transition probability matrix

Prediction of tourists flow distribution based on transition...

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8th International Conference on information Science and Digital Content Technology, ICIDT 2012

作者： Hu, Yuting Xie, Rong Zhang, Wenjun Xu, Yi Institute of Image Communication and Information Processing Shanghai Digital Media Processing and Transmission Key Lab. Shanghai Jiaotong University Shanghai China

ISBN: (纸本)9788988678695

A new prediction algorithm of tourists flow distribution based on transition probability matrix (TPM) is proposed in this paper. In order to analyze the visitor transition-behavior and the tourists distribution model, the tourists flow distribution of 5 zones at Shanghai Expo site is predicted based on the TPM, which is estimated by use of multivariate linear regression in optimization. The extensive experimental results verify the efficiency and the correctness of the proposed algorithm over the wavelet neural network prediction method. © 2012 AICIT.

关键词： Forecasting

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Specific Emitter Identification Based on CNN via Variational Mode Decomposition and Bimodal Feature Fusion

Specific Emitter Identification Based on CNN via Variational...

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Power Electronics, Computer Applications (ICPECA), IEEE International Conference on

作者： Jinling Su Heng Liu Liu Yang Key Lab of Information Coding & Transmission Southwest Jiaotong University Chengdu China

Specific emitter identification (SEI) refers to the technology of identifying specific emitter individuals by the RF fingerprint carried by the emitter transmitting signals. RF fingerprint is a hardware difference feature caused by the nonlinearity and tolerance of the components inside the emitter, and can be used as the unique identification of the emitter. In this paper, we propose an emitter identification scheme based on convolutional neural network (CNN) via variational mode decomposition (VMD) and bimodal feature fusion. Firstly, four stray components of LoRa signals are extracted by VMD, which contain unintentional modulation features of the original signals. Then the time-frequency features (VMD-S) and temporal features (VMD-T) are extracted from the four stray components. Consequently, a CNN-based two-channel feature extraction network is built with an attention module and a bimodal feature fusion strategy which realizes the fusion of VMD-S and VMD-T. The experimental results show that the proposed SEI scheme achieves higher identification accuracy in comparison with the scheme without feature fusion at the low signal-to-noise ratio (SNR) region.

关键词： Radio frequency Time-frequency analysis Transmitters Modulation Fingerprint recognition Feature extraction Power electronics

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New opportunistic interference alignment in MIMO interference multiple access channels

New opportunistic interference alignment in MIMO interferenc...

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International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Lijun Bai Li Hao Siyang Tang Key Lab of Information Coding and Transmission Southwest Jiaotong University Chengdu China

ISBN: (纸本)9781509028610

In this paper, we investigate the K-cell multiple input multiple output (MIMO) interference multiple-access channel (IMAC) where opportunistic user scheduling and interference alignment (IA) are combined. For traditional opportunistic IA (OIA) scheme, without consideration on enhancing the effectiveness of the desired signal, each user calculates its beamforming vector only based on the singular value decomposition (SVD) of its total leakage of interference (LIF), which leads to the performance deterioration in terms of both the achievable average sum rate and bit error rate (BER). Focusing on K-cell MIMO IMAC, we propose the signal to LIF ratio (SLIR) OIA in this paper, the beamforming vector design criterion of which takes both LIF and desired signal into consideration. Compare with the existing OIA scheme, the proposed SLIR-OIA has the same order of magnitude in computational complexity. Applying the proposed SLIR-OIA algorithm to both perfect and limited feedback scenarios, we evaluate the sum rate and BER performance through simulations, the results of which show that the proposed SLIR-OIA scheme outperforms the traditional OIA scheme significantly.

关键词： Interference Array signal processing MIMO Measurement Algorithm design and analysis Feeds Bit error rate

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