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

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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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Performance of Turbo coded wireless link for SISO-OFDM, SIMO-OFDM, MISO-OFDM and MIMO-OFDM system

Performance of Turbo coded wireless link for SISO-OFDM, SIMO...

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14th International Conference on Computer and information Technology, ICCIT 2011

作者： Kamruzzaman, M.M. Key Lab. of Information Coding and Transmission Southwest Jiatong University Chengdu Sichuan China

ISBN: (纸本)9781612849065

In this paper, performance of a Turbo coded OFDM wireless link is evaluated in the presence of Rayleigh fading for SISO, SIMO, MISO and MIMO system. Data are encoded using turbo encoder then modulated by QPSK or 16 QAM or 64 QAM and further encoded using STBC, and the encoded data are split into n streams which are modulated by OFDM and simultaneously transmitted using n transmit antennas. It is observed that the turbo coded SISO-OFDM system provides 21 dB coding gain at 10-4, turbo coded SIMO-OFDM system provides 20 and 13 db coding gain for 2 and 4 receive antennas respectively at a BER of 10-6, turbo coded MISO-OFDM system provides 17 and 12 dB coding gain for 2 and 4 transmit antennas respectively at a BER of 10-6 and turbo coded MIMO-OFDM system provides 11 to 13 dB coding gain for different combination of transmit and receive antennas at BER 10-6 compare to uncoded SISO-OFDM, SIMO-OFDM, MISO-OFDM and MIMO-OFDM system. © 2011 IEEE.

关键词： Orthogonal frequency division multiplexing

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A relative risk model for anomaly detection in wireless sensor networks

A relative risk model for anomaly detection in wireless sens...

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2008 International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2008

作者： Jiayu, Tang Pingzhi, Fan Key Lab. of Information Coding and Transmission IMC Southwest Jiaotong University Chengdu China

ISBN: (纸本)9781424421084

Localization anomaly detection (LAD) for a wireless sensor network (WSN) plays a prominent role in defending against attacks on localization services. However, it is a difficult task to evaluate the effectiveness of the anomaly detection scheme according to complexity and uncertainty in various applications. This paper presents a relative risk model approach that was proposed for ecological risk assessment (ERA) to tackle this problem. The problem formulation and model-building process is described in detail. Our numerical simulation demonstrates that this relative risk model method is quite effective to the quantitative assessment of vulnerability analysis in wireless sensor networks. © 2008 IEEE.

关键词： Wireless sensor networks

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Improved method for detecting the short cycles of LDPC codes

Improved method for detecting the short cycles of LDPC codes

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2010 IEEE International Conference on information Theory and information Security, ICITIS 2010

作者： Hu, Pan Zhao, Hongyu Key Lab. of Information Coding and Transmission Southwest Jiao tong University Chengdu China

ISBN: (纸本)9781424469406

It is well known that the short cycles in Tanner Graph (TG) greatly impact on the iterative decoding performance of low density parity check (LDPC) codes. In previous literature two methods can be found for detecting such short cycles. This paper presents an improved version of previous Jun Fan's method, which is based on combinational analysis and enumeration of the check matrix patterns caused by cycles of length of 4, 6, 8 and 10 in the corresponding TG. The improved method can more exactly detect the cycles of length greater than 4 in comparison with Jun Fan's method. The validation of the proposed method can be verified by the detection results of short cycles for some LPDC codes. © 2010 IEEE.

关键词： Iterative decoding

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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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The average hamming correlation for the cubic polynomial hopping sequences

The average hamming correlation for the cubic polynomial hop...

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International Wireless Communications and Mobile Computing Conference, IWCMC 2008

作者： Peng, D.Y. Niu, X.H. Tang, X.H. Chen, Q.C. IEEE Key Lab. of Information Coding and Transmission Southwest Jiaotong University Chengdu Sichuan China

ISBN: (纸本)9781424422029

The average Hamming correlation is an important performance indicator of the frequency hopping sequences. In this paper, the lower bound on the average Hamming correlation for frequency hopping sequences with respect to the size q of the frequency slot set, the sequence length L, the family size M, the average Hamming autocorrelation Aa and the average Hamming crosscorrelation Ac, is established. The average Hamming correlation for the cubic polynomials hopping sequences over a finite field GF(p) is also derived and discussed. It is shown that the cubic polynomials hopping sequences over a finite field GF(p) are the optimal average Hamming correlation sets. © 2008 IEEE.

关键词： Frequency hopping

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A pairing scheduling scheme for virtual MIMO systems

A pairing scheduling scheme for virtual MIMO systems

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International Conference on Wireless Communications, Networking and Mobile Computing

作者： Huang, Bo Fang, Xuming Chen, Qing He, Rong Chen, Wu Provincial Key Lab. of Information Coding and Transmission Southwest Jiaotong Universit Chengdu 610031 China

ISBN: (纸本)9781424437092

Virtual MIMO (VMIMO) in the uplink communication system is a promising technique focused in recent years. It groups two or more user equipments (UEs) with individual antenna to construct a VMIMO channel communicating with a base station (BS) simultaneously in the uplink. In this paper we consider two UEs collab.ration (2×2 VMIMO), and propose a novel pairing scheduling based on the SINR threshold combined with the system packet scheduling scheme. The proposed scheme has the advantage of low computational complexity and improves the system capacity without reducing the user's quality of service. Simulation results show that the proposed scheme combined with the Proportional Fair (PF) packet scheduling is able to reach greater system throughput which is more suitable for the real system while the proposed scheme combined with the RR packet scheduling scheme have the advantage of lower data packet lose rate which has the better quality of service. © 2010 IEEE.

关键词： MIMO systems

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A novel handover scheme with relay technique in GSM-R network

A novel handover scheme with relay technique in GSM-R networ...

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2009 4th International Conference on Communications and Networking in China, CHINACOM 2009

作者： Zheng, Xiang Fei, Yang Key Lab. of Information Coding and Transmission Southwest Jiaotong University Chengdu 610031 Sichuan China

ISBN: (纸本)9781424443376

GSM-R (GSM for Railway) network is a professional cellular network which is used for railway transportation. Unlike mobiles with low speed in regular GSM network, in GSM-R network the signals received by mobiles on high speed trains may suffer severe Doppler shift and other interferences. Therefore, measurement of these tainted signals may cause wrong handover decisions, leading to lower probability of successful handover, hence the safety and reliability of GSM-R network are reduced significantly. In this paper, a novel handover scheme with relay technique in GSM-R network is proposed, which involves measurement of signals from relay stations in handover process. Numerical results show that the outage rate of handover using this new scheme is obviously smaller than that without relay stations, thus higher probability of successful handover is achieved.

关键词： Railroads

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