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IEEE International Conference on communications

作者： Tianyu Wang Lingyang Song Zhu Han Xiang Cheng Bingli Jiao The State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Electrical and Computer Engineering Department University of Houston

ISBN: (纸本)9781457720529

We consider a cognitive radio network in which multiple pairs of secondary users (SUs) communicate by a one-way relay node over orthogonal channels with the existence of an eavesdropper close to the destination. The transmit power of the relay needs efficient distribution for maximizing the sum secrecy rate of the SU pairs, meanwhile satisfying the interference constraint at the single primary user (PU). Specifically, we introduce two multi-object auctions, i.e. the Vickrey auction and the sequential first-price auction, to perform this power allocation problem. We prove the existence and give the general form of the only equilibrium for each auction. We also propose two algorithms based on the equilibriums, respectively. From the simulation results, we see that the system secrecy rate curve of the Vickrey auction gradually coincides with that of the optimal allocation with increasing power units, while the sequential first-price auction reflects more fairness.

关键词： Relay networks power splitting Transmitter power Physical layer Interference constraints Privacy Sequential Cognitive radio optimal allocation Game theory relay

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Design and evaluation of an IDMA cooperative relay free-space optical system

Design and evaluation of an IDMA cooperative relay free-spac...

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International Conference on Space Optical systems and Applications

作者： Jingyuan Fan Xiaolin Zhou Jun Liu State Key Laboratory of ASIC & System and Department of Communication Science and Engineering Fudan University Shanghai 200433 China

ISBN: (纸本)9781424496860

In this paper, we illustrate our attempt in an effective method of free space optical (FSO) communications. Firstly, a pulse-position modulated (PPM) optical interleave-division multiple-access (OIDMA) system is designed. Secondly, to alleviate the degrading effects of atmospheric turbulence, cooperative relay technique is adopted by OIDMA for achieving spatial diversity and robust transmission performance. Thirdly, to study the convergence behavior of the proposed relay-assisted optical PPM-OIDMA system, extrinsic information transfer (EXIT) charts are analyzed. By deriving the trajectories of the exchanged extrinsic information from EXIT charts, the time of iterations required for convergence can be easily predicted. The effects of scintillation, thermal noise, background noise and multi-user interference have been taken into consideration.

关键词： EXIT analysis OIDMA cooperative relay free-space optical EXITS free-space optical communication interleave division multiple access Multi-user Interference relay Optical systems Converge iterative methods optical

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Seamless Integration of RZ-DPSK-DWDM Optical Links with MIMO-OFDM system for 4th Generation Wide-Area Coverage Mobile communication

Seamless Integration of RZ-DPSK-DWDM Optical Links with MIMO...

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2011 International Conference on Future Wireless Networks and Information systems(ICFWI 2011)

作者： Yufeng Shao Yuanquan Wang Nan Chi State Key Lab of ASIC & System and Department of Communication Science and engineeringFudan University

We introduce 10×10Gb/s RZ-DPSK-DWDM links in the architecture integration of MIMO-OFDM *** optical communication performance and wireless communication performance is analyzed in the integrated *** long distance transmission for RZ-DPSK WDM is done,and the demodulated RZ-DPSK signal is transformed to the binary data,which is given to MIMO-OFDM-QPSK wireless communication *** MIMO-OFDMQPSK wireless system is designed with two transmit antennas and one receive antenna and four transmit antennas and one receive *** BER performance of almost 10-3 is achieved at SNR of 11 d B with four transmit antennas and one receive antenna which is better as compared to two transmit antennas and one receive *** results prove that seamless integration of RZ-DPSK-DWDM optical links with MIMO-OFDM system is suitable to simultaneously offer higher receiver performance and simplify system configuration for 4th generation wide-Area coverage mobile communication.

关键词： DWDM,RZ-DPSK,MIMO,OFDM,4G

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Compensation of Quadrature Imbalance in an Optical Coherent OQPSKReceiver in the presence of Frequency Offset and Phase Drift

Compensation of Quadrature Imbalance in an Optical Coherent ...

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全国第15次光纤通信暨第16届集成光学学术会议

作者：李欣颖 Yufeng Shao Bo Huang Junwen Zhang Shumin Zou Wuliang Fang Li Tao Jiangbo Zhu 迟楠 Department of Communication Science and Engineering State Key Lab of ASIC ＆ SystemFudan University

＜正＞In this letter,we describe the impact of quadrature imbalance（QI） in the presence of frequency offset and phase drift in an optical coherent offset-quadrature phase-shift-keying（OQPSK） *** the time domain,QI tilts and squeezes the square constellation into a diamond ***’ more,frequency offset continuously rotates the *** the presence of both QI and frequency offset,the constellation becomes *** conjugate misalignment was realized in a 2×4 90°optical hybrid, and the Gram-Schmidt orthogonalization procedure（GSOP） was applied in our simulation to compensate for quadrature imbalance in the ***,the GSOP enabled a set of nonorthogonal samples to be transformed into a set of orthogonal ***,a time domain method was adopted to compensate for chromatic dispersion（CD） due to fiber ***,the frequency offset between the received optical signal and LO signal,which was 200MHz in our simulation,was estimated and corrected by the phase increment estimation ***,we recovered the ideal square constellation after carrier phase estimation.

关键词： OQPSK Quadrature imbalance Frequency offset Phase drift

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Multiple-Inputs Multiple-Outputs Combining Center Launch and Ring Launch for High-Speed Transmission in Multimode Fiber Links

Multiple-Inputs Multiple-Outputs Combining Center Launch and...

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2011 International Conference on Future Wireless Networks and Information systems(ICFWI 2011)

作者： Yuanquan Wang Yufeng Shao Nan Chi State Key Lab of ASIC & System and Department of Communication Science and engineeringFudan University

Multiple-inputs multiple-outputs(MIMO) technology widely used in wireless system is introduced to multimode fiber(MMF) *** the typical MIMO implemented in MMF,we setup a novel MIMO system combining center launch and ring launch instead of offset *** was investigatedthat the ring launch can induce fewer modes and the sensitivity is shown to be superior to offset launch.A mathematicsystem model was given and *** further adopt intensity modulation direct detection for transmit *** simulated results revealthat a data rate of 30 Gb/s over 800 m graded index-multimode fiber(GI-MMF) can be achieved by using this newly established MIMO.

关键词： optical communication,multimode fibers,ring launch,center launch,multiple-inputs multiple-outputs

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Planar on-chip flow cytometer using evanescent waves based on liquid total internal reflection (L-TIR)

Planar on-chip flow cytometer using evanescent waves based o...

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International Solid-state Sensors, Actuators and Microsystems Conference

作者： Huang, H. Ji, X.M. Zhou, J. Huang, T.J. Huang, Y.P. ASIC and System State Key Lab Department of Microelectronics Fudan University Shanghai China Department of Engineering Science and Mechanics Pennsylvania State University University Park PA United States

ISBN: (纸本)9781457701573

This paper reports a planar flow cytometer for the detection of fluorescent particles using evanescent waves based on the liquid total internal reflection (L-TIR). This on-chip flow cytometer is able to form the evanescent waves on the interface between liquids which can be used to detect the fluorescent particles in nanosize with high speeds. The total internal reflection is formed to generate the evanescent waves by the geometry of the liquid interface which is defined by the structure of the device. The particles are injected and focused by the hydrodynamic method which makes the particles go through the optical detection area shined by the exciting laser one by one. This method has been proven to be a fast and effective method to analyze fluorescent particles or cells with the exciting light in the depth of several hundred nanometers. © 2011 IEEE.

关键词： Liquids

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Fluorescence enhancement via single-core liquid waveguides in microfluidic channels

Fluorescence enhancement via single-core liquid waveguides i...

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International Solid-state Sensors, Actuators and Microsystems Conference

ISBN: (纸本)9781457701573

A single-core liquid waveguide is reported to be used in the fluorescence enhancement. The liquid waveguide consists of the high refractive index liquid core and the low refractive index sheath liquid. The diameter of the liquid core can be tuned by sheath flow, and the liquid waveguide can work in different status of the refractive index profiles by the diffusion of the high refractive index solution. Because of the total internal reflection on the liquid interface and the focusing by the gradient refractive indices, the intensity of the fluorescent light collected inside the liquid core is increased. The fluorescence enhancement by the liquid waveguide is characterized by measuring the intensities from the top and the end of the liquid waveguide by the spectrometer. The result shows that the fluorescence enhancement is successfully achieved in the liquid waveguide by controlling the refractive index profiles of the liquids. © 2011 IEEE.

关键词： Liquids

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Depth map optimization based on just noticeable depth difference model

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Guangdianzi Jiguang/Journal of Optoelectronics Laser 2012年第7期23卷 1418-1424页

作者： Zhang, Yan An, Ping Zhang, Qiu-Wen Wang, Kui Zhang, Zhao-Yang Key Laboratory of Advanced Displays and System Application Shanghai University Shanghai 200072 China School of Communication and Information Engineering Shanghai University Shanghai 200072 China Department of Computer Science and Technology Anhui University of Finance and Economics Bengbu 230030 China

According to the human visual sensitivity characteristics to spatial depth changes, this paper studies the just noticeable depth difference (JNDD) of the detail perception. The JNDD model is proposed through derivation and analysis on a large number of subjective experiments. Then, a trilateral filtering algorithm is presented based on the model to suppress the unperceivable depth details and to minimize the rendering artifacts due to the inaccurate depth estimation. Subjective and objective experimental results prove that the proposed trilateral filtering algorithm for depth map based on JNDD model can smooth the object edges and reduce the edge noise in the synthesized view while reduce the bit rates.

关键词： Bandpass filters

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Compensation of Quadrature Imbalance in an Optical Coherent OQPSK Receiver in the presence of Frequency Offset and Phase Drift

Compensation of Quadrature Imbalance in an Optical Coherent ...

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中国光学学会纤维光学与集成光学专业委员会全国第15次光纤通信暨第16届集成光学学术会议

作者： Xinying Li Yufeng Shao Bo Huang Junwen Zhang Shumin Zou Wuliang Fang Li Tao Jiangbo Zhu Nan Chi Department of Communication Science and Engineering State Key Lab of ASIC & System Fudan University Shanghai 200433 China

In this letter, we describe the impact of quadrature imbalance (QI) in the presence of frequency offset and phase drift in an optical coherent offset-quadrature phase-shift-keying (OQPSK) *** the time domain, QI tilts and squeezes the square constellation into a diamond ***' more, frequency offset continuously rotates the *** the presence of both QI and frequency offset, the constellation becomes *** conjugate misalignment was realized in a 2×4 90° optical hybrid, and the Gram-Schmidt orthogonalization procedure (GSOP) was applied in our simulation to compensate for quadrature imbalance in the ***, the GSOP enabled a set of nonorthogonal samples to be transformed into a set of orthogonal ***, a time domain method was adopted to compensate for chromatic dispersion (CD) due to fiber ***, the frequency offset between the received optical signal and LO signal, which was 200MHz in our simulation, was estimated and corrected by the phase increment estimation ***, we recovered the ideal square constellation after carrier phase estimation.

关键词： OQPSK Quadrature imbalance Frequency offset Phase drift

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The theoretical and numerical models of a novel multi-wavelength source using a semiconductor ring laser

The theoretical and numerical models of a novel multi-wavele...

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OptoElectronics and communications Conference, OECC

作者： Jiangbo Zhu Junwen Zhang Nan Chi Siyuan Yu State Key Laboratory of ASIC & System and Department of Communication Science and Engineering Fudan University Shanghai China Department of Electronic and Electrical Engineering University of Bristol Bristol UK

A novel concept of multi-wavelength source is presented. We have simulated the performance by numerically solving the multimode rate equations of the system. 7 carriers are obtained, with flatness less than 5 dB.

关键词： Mathematical model Cavity resonators Numerical models Laser modes Optical filters Laser theory Semiconductor lasers

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