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Enhanced Privacy-Preserving WiFi Fingerprint Localization from CL Encryption

Chinese Journal of Electronics 2024年第6期33卷 1435-1446页

作者： Zhiwei WANG Qiuchi ZHU Zhenqi ZHANG School of Computer Nanjing University of Posts and Telecommunications State Key Laboratory of Public Big Data Guizhou University Advanced Cryptography and System Security Key Laboratory of Sichuan Province Chengdu University of Information Engineering Key Laboratory of Computational Science and Application of Hainan Province Hainan Normal University

The WiFi fingerprint-based localization method is considered one of the most popular techniques for indoor localization. In INFOCOM'14, Li et al. proposed a wireless fidelity(WiFi) fingerprint localization system based on Paillier encryption, which is claimed to protect both client C 's location privacy and service provider S's database privacy. However, Yang et al. presented a practical data privacy attack in INFOCOM'18, which allows a polynomial time attacker to obtain S's database. We propose a novel WiFi fingerprint localization system based on CastagnosLaguillaumie(CL) encryption, which has a trustless setup and is efficient due to the excellent properties of CL encryption. To prevent Yang et al.'s attack, the system requires that S selects only the locations from its database that can receive the nonzero signals from all the available access points in C 's nonzero fingerprint in order to determine C's location. Security analysis shows that our scheme is secure under Li et al.'s threat model. Furthermore, to enhance the security level of privacy-preserving WiFi fingerprint localization scheme based on CL encryption, we propose a secure and efficient zero-knowledge proof protocol for the discrete logarithm relations in C's encrypted localization queries.

关键词： Location awareness Threat modeling Data privacy Protocols Databases Fingerprint recognition Trustless services Encryption Servers Wireless fidelity

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An effective error concealment method used in multi-view video coding

An effective error concealment method used in multi-view vid...

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4th International Congress on Image and Signal Processing, CISP 2011

作者： Liang, Liang Ma, Ran An, Ping Liu, Chang School of Communication and Information Engineering Shanghai University Shanghai China Key Laboratory of Advanced Display and System Application of the Ministry of Education Shanghai China

ISBN: (纸本)9781424493067

Multi-view video coding (MVC) is one of the newest video compression standards, which has better compression efficiency than single view video coding. As the coding scheme exploits spatial, temporal and inter-view dependability for this scope, it leads the reconstructed multi-view video (MVV) become worse when transmitted in error-prone networks. To solve this problem, an effective error concealment (EC) method for MVC is proposed in this paper. The proposed method conceals a corrupted block by combining a few candidate blocks in intra-view reference frames or inter-view reference frames. The experimental results show that the proposed method has better concealment effect if using the inter-view reference frames effectively in B-view. © 2011 IEEE.

关键词： Image coding

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Numerical differentiation of noisy data with local optimum by data segmentation

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Journal of systems Engineering and Electronics 2015年第4期26卷 868-876页

作者： Jianhua Zhang Xiufu Que Wei Chen Yuanhao Huang Lianqiao Yang Key Laboratory of Advanced Display and System Applications (Shanghai University) Ministry of Education School of Mechanical & Electronic Engineering and Automation Shanghai University

A new numerical differentiation method with local opti- mum by data segmentation is proposed. The segmentation of data is based on the second derivatives computed by a Fourier devel- opment method. A filtering process is used to achieve acceptable segmentation. Numerical results are presented by using the data segmentation method, compared with the regularization method. For further investigation, the proposed algorithm is applied to the resistance capacitance （RC） networks identification problem, and improvements of the result are obtained by using this algorithm.

关键词： numerical differentiation noisy data local optimum,data segmentation.

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Frame-layer bit allocation for multi-view video coding based on frame complexity estimation

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Journal of Shanghai University(English Edition) 2010年第1期14卷 50-54页

作者：严涛安平沈礼权李振纲王贺张兆杨 School of Communication and Information Engineering Shanghai University Key Laboratory of Advanced Displays and System Application

Current multi-view video coding （MVC） reference model in joint video team （JVT） does not provide efficient rate control schemes. This paper presents a rate control algorithm for MVC by improving the quadratic rate-distortion （R-D） model. We reasonably allocate bit-rate among views based on the correlation analysisl The proposed algorithm consists of three levels to control the rate bits more accurately, of which the frame layer allocates bits according to the frame complexity and the temporal activity. Extensive experiments show that the proposed algorithm can control the bit rate efficiently.

关键词： multi-view video coding (MVC) rate control bit-allocation rate-distortion model correlation analysis frame complexity

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An adaptive and fast H.264 multi-frame selection algorithm based on information from previous searches

An adaptive and fast H.264 multi-frame selection algorithm b...

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IEEE International Conference onMultimedia and Expo, ICME 2007

作者： Liquan, Shen Zhi, Liu Zhaoyang, Zhang Xuli, Shi Key Lab. of Advanced Display and System Application Ministry of Education Shanghai University Shanghai 200072 China

ISBN: (纸本)1424410177

The H.264 video coding standard adopts multiple reference frames for motion estimation. This new feature improves the prediction accuracy of inter-coding blocks significantly, but it results in a considerable increase in encoder complexity, mainly regarding to multi-frame selection and motion estimation. The reference software JM adopts the full search scheme, and the increased computation is in proportion to the number of searched reference frames. However, the reduction of prediction residues is highly dependent on the nature of sequences, not on the number of searched frames. In this paper, we propose an adaptive and fast multi-frame selection algorithm (AFMFS) based on motion vectors and SAD information coming from previous searches to adaptively terminate the procedure of multiple reference frames selection. Compared with the full search algorithm and the flexible multi-reference frame search criterion (FMRFSC), simulation results show that the proposed algorithm can save 55.28% and 40.23% computation cost on average, respectively, while it still maintains similar coding efficiency. © 2007 IEEE.

关键词： Motion estimation

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A 2.4GHz high efficient monolithic class E power amplifier

A 2.4GHz high efficient monolithic class E power amplifier

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Asia Pacific Conference on Postgraduate Research in Microelectronics & Electronics (PrimeAsia)

作者： Su, Jie Zhang, Shulin Chen, Lei Tian, Liang Zhou, Jin Ruan, Ying Ran, Feng Lai, Zongsheng Institute of Microelectronics Circuit and System East China Normal University Shanghai 20062 China Key Laboratory of Advanced Display and System Application ShangHai University Shanghai 20062 China

ISBN: (纸本)9781424467372

This paper presents a 2.4GHz monolithic Class E power amplifier based on Grace 0.18um SiGe BiCMOS technology. It has a two-stage structure and adopts small DC feed inductors and on-chip matching networks. Without any off-chip components, the power amplifier achieves maximum output power of 22.4dBm. and the PAE is 33% with 2V supply. After optimizing the component parameter, the input and output terminals are both well matched to baseband and antenna respectively. With EER or ET technology this switch-mode amplifier can realize linear amplification, resulting in impressive high efficient in future communication system.

关键词： Power amplifiers

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Unequal decoding power allocation for efficient video transmission

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Journal of Shanghai University(English Edition) 2010年第1期14卷 60-65页

作者：王永芳余松煜杨小康张兆杨 Key Laboratory of Advanced Display and System Application School of Communication and Information Engineering Shanghai University Institute of Image Communication and Information Processing Research Shanghai Jiao Tong University

We present an unequal decoding power allocation （UDPA） approach for minimization of the receiver power consumption subject to a given quality of service （QoS）, by exploiting data partitioning and turbo decoding. We assign unequal decoding power of forward error correction （FEC） to data partitions with different priority by jointly considering the source coding, channel coding and receiver power consumption. The proposed scheme is applied to H.264 video over additive white Gaussion noise （AWGN） channel, and achieves excellent tradeoff between video delivery quality and power consumption, and yields significant power saving compared with the conventional equal decoding power allocation （EDPA） approach in wireless video transmission.

关键词： power allocation turbo code data partition joint source and channel code

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Wigner-Ville distribution and cross Wigner-Ville distribution of noisy signals

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Journal of systems Engineering and Electronics 2008年第5期19卷 1053-1057页

作者： Chen Guanghua Ma Shiwei Liu Ming Zhu Jingming Zeng Weimin Key Laboratory of Advanced Display and System Applications Ministry of Education & Microelectronic Research and Development Center Shanghai Univ. Shanghai 200072 P. R. China

The Wigner-Ville distribution （WVD） and the cross Wigner-Ville distribution （XWVD） have been shown to be efficient in the estimation of instantaneous frequency （IF）. But the statistical result of the IF estimation from XWVD peak is much better than using WVD peak. The reason is given from a statistical point of view. Theoretical studies show that XWVD of the analyzed signal can be estimated from XWVD of the noise-contaminated signal. The estimation is unbiased, and the variance is equal to that of noise. In this case, WVD cannot be estimated from W-VD of the noise-contaminated signal. Therefore, higher SNR is required when WVD is used to analyze signals.

关键词： Wigner-Ville distribution cross Wigner-Ville distribution instantaneous frequency expectation variance.

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The design of synchronous module in AM-OLED display controller

The design of synchronous module in AM-OLED display controll...

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2011 International Conference on Electric and Electronics, EEIC 2011

作者： Junwei-Ma Ran, Feng School of Mechatronical Engineering and Automation Shanghai University Shanghai China Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University China

ISBN: (纸本)9783642216961

On the basis of the analysis to the framework of AM-OLED display controllers, a key module - synchronous module is studied. In this paper, a FIFO circuit (first in first out) is designed using Gray convert technology and dual-port ram, which realizing scatheless transmit between different clock domain. The working principle of FIFO is analyzed, and the optimized FIFO circuit structure was put forward to improve the working stability of the FIFO. The synchronous module circuit was implemented by VerilogHDL language simulated through VCS (Verilog compiled simulator). The design had been applied successfully to a type of full colour TFT-OLED panel driver controller with gray levels 256, frame scanning frequency 60Hz ~ 100Hz. The testing results showed that this controller worked well with a stable and vivid display. © 2011 Springer-Verlag Berlin Heidelberg.

关键词： Controllers

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Unsupervised detection of abnormal behavior for intelligent surveillance

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Journal of Information and Computational Science 2014年第13期11卷 4805-4818页

作者： Zhang, Changqi Guan, Yepeng School of Communication and Information Engineering Shanghai University Shanghai China Key Laboratory of Advanced Displays and System Application Ministry of Education Shanghai University Shanghai China

A novel method based on dynamic particle flow has been developed to detect abnormal behavior automatically. The proposed approach starts by taking motion crowds as an aperiodic dynamical flow field to solve abnormal behavior detection problem. The motion in the scene is described by the particle trajectories computed by time integration of the dynamical flow field. Abnormal behavior is detected automatically based on some high-level features extracted from the developed particle flow without any hypothesis for the scene conditions in advance. The proposal does not require any object detection, tracking, or training in detecting abnormal behaviors. Comparative studies with some investigated methods have indicated the superior performance of the proposal in detecting abnormal behaviors from cluttered contents with dynamic scene variation and crowded environments. Copyright © 2014 Binary Information Press.

关键词： Flow fields

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