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Construction of optimal 2D variable-weight optical orthogonal codes for high-speed OCDMA networks

Chinese Optics Letters 2010年第9期8卷 884-887页

作者：李西洋范平志类先富 Provincial Key Lab of Information Coding & Transmission School of Information Science & Technology Southwest Jiaotong University School of Mathematical Sciences Guangxi Teachers Education University

A new construction method of two-dimensional （2D） variable-weight optical orthogonal codes （VWOOCs） is proposed for high-speed optical code-division multiple-access （OCDMA） networks supporting multiple qualities of services （QoS）. The proposed codes have at most one-pulse per wavelength （AM-OPPW） property. An upper bound of the codeword cardinality of the 2D VWOOCs with AM-OPPW property is derived. It is then shown that the constructed codes have ideal correlation properties and optimal cardinality. Moreover, the code length and the bit-error-rate （BER） performance of the proposed codes are compared with those of the codes proposed previously.

关键词： Code division multiple access Optical communication Optimization

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A layered grouping random access scheme based on dynamic preamble selection for massive machine type communications

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Science China(information Sciences) 2022年第7期65卷 269-270页

作者： Gaofeng CHENG Huan CHEN Pingzhi FAN Li LI Li HAO Information Coding & Transmission Key Lab of Sichuan Province CSNMT International Cooperation Research Centre of China Southwest Jiaotong University

Dear editor, The massive random access （RA） schemes in the existing literature are mainly grant-free approaches, which are supported by non-orthogonal multiple access [1–3], compressive sensing （CS） [4, 5], group paging [2, 6], and multichannel ALOHA [7]. However, they still face the challenges of high energy consumption and data overhead, especially in future ultra-dense Internet of Things （Io T） networks （> 10～6devices/km2） [8].

关键词： grant free layered grouping AMP algorithm minimum preamble length mMTC

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A fast parallel SC-Fano decoding algorithm for PAC codes

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Science China(information Sciences) 2023年第5期66卷 215-226页

作者： Yunzhi WU Li LI Pingzhi FAN Information Coding & Transmission Key Lab of Sichuan Province Communications & Sensor Networks for Modern Transportation International Cooperatation Research Centre of China Southwest Jiaotong University

In order to efectively reduce the “decoding latency” of successive cancellation decoding aided Fano(SC-Fano) decoder employed in polarization-adjusted convolutional(PAC) codes, a fast parallel SCFano decoding algorithm is designed, which leverages multiple individual decoding components. Critical challenges arise from how to appropriately initialize the thresholds of diferent SC-Fano decoding components and how will these decoding components cooperate with each other. After appropriately overcoming these challenges, our design is capable of halving the “decoding latency” without incurring any noticeable frame error rate(FER) performance degradation, meanwhile, the overall computational complexity is normally constrained below one and a half times of that required by conventional SC-Fano decoders in simulated typical configurations.

关键词： PAC codes parallel decoding Fano decoding complexity

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Joint applications of Tomlinson-Harashima precoding and interference alignment in amplify-and-forward multi-relay cellular networks

Joint applications of Tomlinson-Harashima precoding and inte...

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5th International Workshop on Signal Design and Its Applications in Communications, IWSDA'11

作者： Liu, Heng Hao, Li Fan, Pingzhi Key Lab of Information Coding and Transmission Southwest Jiaotong University Chengdu China

ISBN: (纸本)9781612840468

This paper proposes a downlink multi-user transmission scheme for the amplify-and-forward (AF)-based multi-relay cellular network, in which Tomlinson-Harashima precoding (TH precoding) and interference alignment (IA) are jointly applied. The whole process of transmission is divided into two phases: TH precoding is first performed at base-station (BS) to support the multiplexing of data streams transmitted to both mobile-stations (MS) and relay-stations (RS), and then IA is performed at both BS and RSs to achieve the interference-free communications. During the whole process, neither data exchange nor strict synchronization is required among BS and RSs, thus reducing the system complexity as well as improving the system performance. Our analysis and simulation results show that the joint applications of TH precoding and IA outperforms other schemes in multi-relay framework. © 2011 IEEE.

关键词： Electronic data interchange

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Specific Emitter Identification Based on CNN via Variational Mode Decomposition and Bimodal Feature Fusion 3

Specific Emitter Identification Based on CNN via Variational...

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3rd IEEE International Conference on Power, Electronics and Computer Applications, ICPECA 2023

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

ISBN: (纸本)9781665472784

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. © 2023 IEEE.

关键词： Variational mode decomposition

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QR iterative subspace identification and its application in image denoising

QR iterative subspace identification and its application in ...

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International Conference on Image and Graphics

作者： Liu, Chanzhi Chen, Qingchun Key Lab of Information Coding and Transmission Southwest Jiaotong University Chengdu Sichuan China

ISBN: (纸本)9780769545417

The foundation of compressed sensing (CS) is the sparse representation of signals. Over-complete dictionaries could be utilized to map signals into their sparse representation over the dictionary. and iterative subspace identification (ISI) is an effective algorithm to determine the over-complete dictionary from signal samples. In this paper, the QR decomposition is proposed to be employed in the ISI scheme so as to obtain the adaptive over-complete dictionary. It is shown that the QR-ISI outperforms the ISI in terms of the recovered PSNR. Finally, the QR-ISI method could be applied to image denoising. Experiment results are presented to show that the QR-ISI offers a feasible method for image denoising with reasonable performance. © 2011 IEEE.

关键词： Image denoising

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Simple Approach to Reduce the Number of Selected Intra Luminance Prediction Modes for RDO Computation in AVS2 2

Simple Approach to Reduce the Number of Selected Intra Lumin...

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2017 IEEE 第2届先进信息技术,电子与自动化控制国际会议(IAEAC 2017)

作者： Yaguang Lu Hongyu Zhao Key Lab of Information Coding and Transmission Southwest Jiaotong University The School of Information Science and Technology Southwest Jiaotong University

The second generation Audio-video coding Standard(AVS2) is the latest video standard currently under the development of Audio-video coding Standard(AVS) Workgroup of China for achieving higher coding

ISBN: (纸本)9781467389808

The second generation Audio-video coding Standard(AVS2) is the latest video standard currently under the development of Audio-video coding Standard(AVS) Workgroup of China for achieving higher coding

关键词： Encoding Prediction algorithms Indexes Video coding Standards Copper Algorithm design and analysis

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Decoupled wireless network architecture for high-speed railway

Decoupled wireless network architecture for high-speed railw...

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2013 International Workshop on High Mobility Wireless Communications, HMWC 2013

作者： Li, Yan Fang, Xuming Key Lab of Information Coding and Transmission Southwest Jiaotong University Chengdu 610031 China

ISBN: (纸本)9781467363808

Reliability and security are crucial considerations for future high-speed railway wireless communication networks which bear the train control information. With the decision by International Union of Railways (UIC) that the narrowband GSM-R (the global system for mobile communication for railway) will evolve to LTE-R (long term evolution for railway) to satisfy the access demands of passengers, capacity becomes another challenge. Taking all of the above into account, novel wireless network architecture for future LTE-R is proposed in this paper, targeting at capacity extension and security enhancement without any loss of reliability. The proposed network architecture is U-plane/C-plane decoupled, and the higher frequency bands with wider spectrum are employed. It may not only save huge infrastructure reconstruction cost but also guarantee the transmission reliability of train control information. The theoretical analysis and simulation reveal that, in this proposed network architecture, train control and passenger services are isolated thereby enhancing the security of train control system and much larger capacity can be supported. Moreover, some other research directions to meet the demands of future LTE-R are presented. © 2013 IEEE.

关键词： Network architecture

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An administrable shortcut transmission scheme for OFDMA two-hop relay networks

An administrable shortcut transmission scheme for OFDMA two-...

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

作者： Long, Yan Fang, Xuming Zhao, Zhengguang Key Lab. of Information Coding and Transmission Southwest Jiaotong University Chengdu China

ISBN: (纸本)9781849191388

In this paper, an Administrable Shortcut transmission (AST) scheme in two-hop relay networks which enables two Subscriber Stations (SSs) within the same Relay Station (RS) communicate directly via RS's forwarding has been investigated. The scenario of AST scheme in two-hop relay networks and a path selection algorithm based on the minimum slot number with AST scheme are put forward. The simulation results show that the system performance is improved significantly with the increase of the probability of AST scheme taken into account. Therefore, AST scheme could be a potential technology for improving system performance in next generation wireless networks.

关键词： transmissions

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Performance of Turbo Coded vertical bell laboratories layered space time multiple input multiple output system 16

Performance of Turbo Coded vertical bell laboratories layere...

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2013 16th International Conference on Computer and information Technology, ICCIT 2013

作者： Kamruzzaman, M.M. Key Lab of Information Coding and Transmission Southwest Jiaotong University ChengduSichuan China

ISBN: (纸本)9781479934973

In this paper, performance of a Turbo Code (TC) and Vertical Bell laboratories Layered Space Time (VBLAST) encoded wireless link is evaluated in the presence of Rayleigh fading for Multiple-Input Multiple-Output (MIMO) system. Turbo encoded bits are modulated using QPSK or 16 QAM or 64 QAM modulator and modulated data are further encoded using VBLAST and then split into n streams which are simultaneously transmitted through n transmit antennas. Simulation results obtained show that coded MIMO system provides 17 to 25 dB coding gain for different combination of transmit and receive antennas at a BER of 10-3 compared to uncoded MIMO system. And there is around 2 to 8 dB gain for increasing number of transmitting antennas from 2 to 3 or 3 to 4. On the other hand, capacities for (2 Tx, 2 Rx), (3 Tx, 3 Rx) and (4 Tx, 4 Rx) are almost same from 0dB to 10dB but change significantly with increasing SNR from 10dB. © 2014 IEEE.

关键词： Quadrature amplitude modulation

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