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International Conference on information Science and Engineering (ICISE)

作者： Xinmin Li Baoming Bai State Key Lab. of Integrated Service Networks Xidian University Xi'an China College of Communication and Information engineering Xi'an University of Science and Technology Xi'an China

In this paper, a method of Tomlinson-Harashima precoding (THP) combined with receive beamforming for the multi-user MIMO broadcast channel is proposed. When the base station and user terminals all have multiple antennas, each user's receiver maximizes the system sum rate with receive beamforming, and the base station use THP based on zero forcing criteria to cancel multiuser interferences (MUI). Simulation results show that the proposed method, THP-BF, has better BER performance than traditional THP and some linear precoding methods such as block diagonalization (BD) and zero forcing (ZF). The sum rate of ZF-THP at asymptotically high SNR is computed, and the computation results are consistent with simulation results. Simulation results reveal that ZF-THP has higher sum rate than linear precoding methods (such as ZF and BD) due to its more degrees of freedom of MIMO channels, and that THP-BF also has higher sum rate than traditional THP at low and moderate SNR.

关键词： Array signal processing MIMO Downlink Base stations Computational modeling Performance analysis Receiving antennas Interference cancellation Mobile communication Analytical models

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A method for blind identification of single user MIMO signal in step by step

A method for blind identification of single user MIMO signal...

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4th International Conference on Wireless and Mobile communications, ICWMC 2008

作者： Chen, Qinghua Xie, Xianzhong Institute of Personal Communication MII Key Lab. of Mobile Communication Technology Chongqing University of Posts and Telecommunications Chongqing 400065 China National Defense Key Laboratory of Telecommunication System Information and Control Technology Jiaxing 314033 China

ISBN: (纸本)9780769532745

This paper constructed signal models of four types of signal in wireless communication, i.e. single user MIMO signal, single user single antenna signal, virtual MIMO signal and multibeam smart antenna signal first, and then proposed a method for blind identification of single user MIMO signal in step by step in noncooperation communication, when the unknown source was one of the four types by using MUSIC algorithm and Forward-backward Spatial Smoothing algorithm to blindly estimate DOAs of the received signal in the first two steps, and use blind channel estimation in the third step. Simulation results show the feasibility of this method. There has not been any published literature reporting research results about this topic yet, so the results of this paper is of important value in both theory and application. © 2008 IEEE.

关键词： Multiple signal classification

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A method for blind identification of uplink virtual MIMO signal

A method for blind identification of uplink virtual MIMO sig...

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3rd International Conference on Innovative Computing information and control, ICICIC'08

作者： Chen, Qinghua Xie, Xianzhong Zheng, Yi Institute of Personal Communication MII Key Lab of Mobile Communication Technology Chongqing University of Posts and Telecommunications Chongqing 400065 China National Defense Key Lab of Telecommunication System Information and Control Technology Jiaxing 314033 China

ISBN: (纸本)9780769531618

This paper discusses system models of three types of signal in wireless communication, i.e. single user single antenna signal, virtual MIMO signal and single user MIMO signal. Based on the model, proposes a method for blind identification of uplink virtual MIMO signal by using the MUSIC algorithm to blindly estimate DOAs of the received signal. Simulation results show the feasibility of this method. This approach has important value in both theory and application for noncooperation communication environment. © 2008 IEEE.

关键词： Antennas

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A technique for blind identification of uplink signals in multibeam smart antenna

A technique for blind identification of uplink signals in mu...

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4th Advanced International Conference on Telecommunications, AICT 2008

作者： Chen, Qinghua Xie, Xianzhong Institute of Personal Communication MII Key Lab of Mobile Communication Technology Chongqing University of Posts and Telecommunications Chongqing 400065 China National Defense Key Laboratory of Telecommunication System Information and Control Technology Jiaxing 314033 China

ISBN: (纸本)9780769531625

In this paper, we construct signal modelings of four types of signals in wireless communication, i.e. single user single antenna signal, virtual MIMO signal, multibeam smart antenna signal and single user MIMO signal first , based on the model, propose a technique for blind identification of uplink signals in multibeam smart antenna by combining MUSIC algorithm with Forward-backward Spatial Smoothing algorithm to blindly estimate DOAs of these four types of signals, when the source signal is one of the four types. Simulation results show the feasibility of this technique. This paper has important value in both theory and application, especially in noncooperation communication environment. © 2008 IEEE.

关键词： Multiple signal classification

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Silicide as diffusion source for dopant segregation in 70-nm MOSFETs with PtSi Schottky-barrier source/drain on ultrathin-body SOI

Silicide as diffusion source for dopant segregation in 70-nm...

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9th International Conference on ULtimate Integration of Silicon, ULIS 2008

作者： Qiu, Z.J. Zhang, Z. Lu, J. Liu, R. Östling, M. Zhang, S.-L. State Key Lab. of ASIC and System School of Microelectronics Fudan University Shanghai China School of Information and Communication Technology Royal Institute of Technology Stockholm Sweden Angstrom Laboratory Uppsala University Uppsala Sweden

ISBN: (纸本)9781424417308

In this paper, dopant segregation (DS) method is adopted to enhance device performance of PtSi-based Schottky-barrier source/drain MOSFETs (SB-MOSFETs) fabricated on ultrathin silicon-on-insulator. The DS formation is realized by means of Suicide As Diffusion Source. Without DS treatment, the devices are typically p-type, but with a rather large electron branch at positive gate bias. Dopant segregation with As is found to turn the devices to well-performing n-MOSFETs, and DS with B to greatly enhance the hole conduction in the p-MOSFETs. A large threshold voltage (Vt) shift is however observed in the p-MOSFET due to B lateral spread caused during the drive-in process for the DS formation. By reducing the drive-in temperature, this problem is partially addressed with a smaller Vt shift and a much better control of short channel effect. © 2008 IEEE.

关键词： Threshold voltage

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Role of Si implantation in control of underlap length in Schottky-Barrier source/drain MOSFETs on ultrathin body SOI

Role of Si implantation in control of underlap length in Sch...

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9th International Conference on ULtimate Integration of Silicon, ULIS 2008

作者： Qiu, Z.J. Zhang, Z. Olsson, J. Lu, J. Hellström, P.-E. Liu, R. Östling, M. Zhang, S.-L. State Key Lab. of ASIC and System School of Microelectronics Fudan University Shanghai China School of Information and Communication Technology Royal Institute of Technology Stockholm Sweden Angstrom Laboratory Uppsala University Uppsala Sweden

ISBN: (纸本)9781424417308

This works demonstrates a novel approach using Si implantation prior to Pt deposition and PtSi formation to control the underlap length between the PtSi source/drain regions to the gate in Schottky-Barrier (SB-) MOSFETs. Dopant segregation at the PtSi/Si interface is used to enhance device performance. With the Ion/Ioff current ratio as an indicator, optimized Si implant doses are found for both n- and p-channel SB-MOSFETs. Through an effective barrier width, the underlap length has direct implication on the leakage current. © 2008 IEEE.

关键词： Schottky barrier diodes

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Research on stochastic comb-pilot design for NC-OFDM system

Research on stochastic comb-pilot design for NC-OFDM system

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

作者： Xuetao, Dong Xianzhong, Xie Institute of Personal Communication MII Key Lab on Mobile Communication CQUPT Chongqing 400065 China National Defense Key Laboratory of Telecommunication System Information and Control Technology NO.36 Institute of CETC Jiaxing 314033 China

ISBN: (纸本)9781424421084

NC-OFDM is OFDM-based spectrum pooling technique and also a transmission mode of cognitive radio. The paper models and analyzes NC-OFDM stochastic process, then designs stochastic comb-pilot pattern and analyzes its characteristics in detail. At the end of the paper simulation results prove the feasibilities of the stochastic comb-pilot strategies in NC-OFDM system. © 2008 IEEE.

关键词： Orthogonal frequency division multiplexing

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Blind source separation algorithm for communication complex signals in communication reconnaissance

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Frontiers of Electrical and Electronic Engineering in China 2008年第3期3卷 338-342页

作者： Weihong FU Xiaoniu YANG Nai’an LIU Xingwen ZENG State Key Laboratory of Integrated Service Networks Xidian UniveristyXi’an 710071China National Laboratory of Information Control Technology for Communication System Jiangnan Electronic Communications Research InstituteJiaxing 314033China

Most blind source separation algorithms are only applicable to real signals,while in communication reconnaissance processed signals are *** solve this problem,a blind source separation algorithm for communication complex signals is deduced,which is obtained by adopting the Kullback-Leibler divergence to measure the signals’*** the other hand,the performance of natural gradient is better than that of stochastic gradient,thus the natural gradient of the cost function is used to optimize the *** to the conclusion that the signal’s mixing matrix after whitening is orthogonal,we deduce the iterative algorithm by constraining the separating matrix to an orthogonal *** results show that this algorithm can efficiently separate the source signals even in noise circumstances.

关键词： communication reconnaissance blind source separation complex signal

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Design and analysis of a multicast-capable optical cross-connect

Design and analysis of a multicast-capable optical cross-con...

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Optical Transmission, Switching, and Subsystems VI

作者： Zhang, Chunlei Hu, Weisheng School of Electronic and Information Engineering Lanzhou Jiaotong University 88 West Anning Road Lanzhou Gansu 730070 China State Key Lab. of Advanced Optical Communication System and Networks Shanghai Jiaotong University 800 Dongchuan Road shanghai 200240 China

As multicast applications become more and more popular, implementing multicast in optical domain has attracted more and more attention due to its more efficient bandwidth usage. The MC-OXC is the key for realizing multicasting at optical layer and directly affects the performance of the multicast services in WDM networks. In this paper, a novel mixed-integrated optical multicast switch for multicast-capable cross-connect is proposed. The new architecture uses power splitters for multicast connections only, allowing unicast sessions to pass without enduring unnecessary power loss. And also the performances of the MC-OXC are analyzed. We performed the cost and cost sensitivity analysis for different MC-OXCs. The results show that the proposed architecture guarantees strictly nonblocking with lower costs. © 2008 SPIE.

关键词： Multicasting

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Twice-Cooperative Spectrum Sensing in Cognitive Radio systems

Twice-Cooperative Spectrum Sensing in Cognitive Radio System...

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International Conference on Wireless communications, Networking and Mobile Computing (WiCom)

作者： Li-Hua He Xianzhong Xie Xue-Tao Dong Tong Zhou Institute of personal communication MII Key lab on mobile communication CQUPT Chongqing China National Defense Key Laboratory of Telecommunication System Information and Control Technology NO.36 Institute of CETC Jiaxing China

The sensing performance of local detection in cognitive radio systems will be degraded when the channel experience fading and shadowing, and hidden terminal problem is inevitable for the primary transmitter-sensing. To overcome this problem, cooperative spectrum sensing has been proposed. We propose a twice-cooperative sensing algorithm to improve the sensing performance. By comparing to the single-cooperative, the simulations show that the proposed algorithm can enhance the sensing performance and the proposed algorithm can also save the band width of the control channel.

关键词： Cognitive radio Fading Degradation Shadow mapping Statistics Wireless sensor networks Probability Helium Mobile communication lab.ratories

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