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Compressed SNR-and-Channel Estimation for Beam Tracking in 60-GHz.WLAN

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China Communications 2015年第6期12卷 46-58页

作者： GAO Bo z.ANG Changming JIN Depeng z.NG lieguang State Key Laboratory on Microwave and Digital Communications Department of Electronic Engineering Tsinghua University

Signal-to-noise ratio （SNR） and channel estimations are critical for 60-GHz.communications to track the optimal trans- mission and reception beam pairs. However, the excessive pilot overhead for the estima- tions severely reduces system throughput in fast-rotation scenarios. In order to address this problem, we firstly demonstrate the potential sparseness property of 60-GHz.channel in beam tracking; subsequently, via exploiting this property, we propose a novel compressed SNR-and-channel estimation. The estimation is conducted in a three-stage fashion, includ- ing the unstructured estimation, nonz.ro-tap detection, and structured estimation with non- z.ro-tap location. Numerical simulations show that, in the case of substantial reduction of the pilot overhead, the proposed estimator still reveals a significant improvement in terms of estimation performance over the scheme in IEEE 802.1 lad. Furthermore, it is also demon- strated that the proposed SNR and channel estimators can approach the lower bounds in sparse channels so long as SNR exceeds 8 dB.

关键词： 60-GHz.communications beamtracking channel estimation SNR estimation sparse channel

Opportunistic spectrum sharing in software defined wireless network

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Journal of Systems Engineering and Electronics 2014年第6期25卷 934-941页

作者： Mao Yang Yong Li Depeng Jin Li Su lieguang z.ng Department of Electronic Engineering Tsinghua University

Over the past few decades, the world has witnessed a rapid growth in mobile and wireless networks（MWNs） which significantly change human life. However, proliferating mobile demands lead to several intractable challenges that MWN has to face. Software-defined network is expected as a promising way for future network and has captured growing attention. Network virtualiz.tion is an essential feature in software-defined wireless network（SDWN）, and it brings two new entities, physical networks and virtual networks. Accordingly, efficiently assigning spectrum resource to virtual networks is one of the fundamental problems in SDWN. Directly orienting towards the spectrum resource allocation problem, firstly, the fluctuation features of virtual network requirements in SDWN are researched, and the opportunistic spectrum sharing method is introduced to SDWN. Then, the problem is proved as NP-hardness. After that, a dynamic programming and graph theory based spectrum sharing algorithm is *** demonstrate that the opportunistic spectrum sharing method conspicuously improves the system performance up to around 20%–30% in SDWN, and the proposed algorithm achieves more efficient performance.

关键词： software-defined network(SDN) wireless virtualiz.-tion opportunistic spectrum sharing dynamic programming graph theory

An Optimiz.tion Methodology for Ring Based SDH Network

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An Optimization Methodology for Ring Based SDH Network

2000 International Conference on Communication Technology(WCC2000·ICCT2000)

作者： Jin Depeng z.ng lieguang Dept. of Electronic Engineering Tsinghua University

ISBN: (纸本)0780363949

＜正＞SDH has greatly developed as a new transmission system of digital network,the SDH backbone network based on the small SDH local networks has emerged as a two-layer wide area *** of good character of survivability,ring topology has extensively used in this two layer *** optimiz.tion has become an urgent problem when designing this *** paper presents a mathematical model for ring based SDH network and a novel optimiz.tion *** example is shown to illustrate the algorithm.

关键词： SDH Ring Optimiz.tion

Hardware/software co-verification platform for EOS design

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High Technology Letters 2005年第3期11卷 294-297页

作者： Wang Peng（王鹏） Jin Depeng z.ng lieguang Department of Electronic Engineering Tsinghua University Beijing 100084 P.R. China Information Engineer University Zhengzhou 450002 P.R. China

Ethernet over SDH/SONET (EOS) is a hotspot in today's data transmission technology for it combines the merits of both Ethernet and SDH/SONET. However, implementing an EOS system on a chip is complex and needs full verifications. This paper introduces our design of Hardware/Software co-verification platform for EOS design. The hardware platform contains a microprocessor board and an FPGA (Field Programmable Gate Array)-based verification board, and the corresponding software includes test benches running in FPGAs, controlling programs for the microprocessor and a console program with GUI (Graphical User Interface) interface for configuration, management and supervision. The design is cost-effective and has been successfully employed to verify several IP (Intellectual Property) blocks of our EOS chip. Moreover, it is flexible and can be applied as a general-purpose verification platform.

关键词： Hardware/software co-verification EOS

An integrated self-healing algorithm for resilient packet ring

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High Technology Letters 2005年第3期11卷 284-288页

作者： z.ou Xiaobo（周晓波） Jin Depeng z.ng lieguang School of Electronics and Information Engineering Beijing Jiaotong University Department of Electronic Engineering Tsinghua University

Resilient Packet Ring (RPR) is a Media Access Control (MAC) layer protocol that operates over a double counter-rotating ring network topology. RPR is designed to enhance Synchronous Digital Hierarchy(SDH) in order to handle data traffic more efficiently. Since Intelligent Protection Switching(IPS) is one of the key technologies in ring networks, RPR provides two intelligent protection algorithms: steering and wrapping. While wrapping in RPR in essence inherits the automatic protection switching(APS) algorithm of SDH, it also wastes the bandwidth on the wrapping ringlets and may result in severe congestion. Whereas steering in RPR provides high bandwidth utiliz.tion, its switching speed is low, because it is indeed a high layer's restoration algorithm. In this paper, integrated self-healing(ISH) algorithm as an effective algorithm for RPR is proposed, which synthesiz.s the merits of the two algorithms by transporting healing signal and computing routing in MAC layer. At last, the performance of ISH algorithm is analyz.d and simulated.

关键词： resilient packet ring (RPR) media access control (MAC) self-healing ring intelligent protection switching (IPS)

Coding and Decoding of Clock Synchroniz.tion in Digital Multiplexing System

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Coding and Decoding of Clock Synchronization in Digital Mult...

2000 International Conference on Communication Technology(WCC2000·ICCT2000)

作者： Wang Hansheng Qin Xiaoyi z.ng lieguang Tsinghua University

ISBN: (纸本)0780363949

＜正＞Digital multiplexing is the basis of high-speed broad band digital communication network,whose theory kernel is processing and transmitting the clock *** transmission of clock synchroniz.tion was not understood systematically and thoroughly before, and it is limited to only analyz.ng the jitter of *** paper interprets the process of clock synchroniz.tion in multiplexing system from quantiz.ng and coding the information of clock synchroniz.tion（interprets justification from T△-ΣM）,and interprets the jitter of justification from quantiz.tion *** to the theoretic model,decreasing the jitter caused by justification is namely decreasing the quantiz.tion error,because the jitter is caused by the quantiz.tion error of the information of clock synchroniz.tion.

关键词： digital multiplexing T△-ΣM jitter clock synchroniz.tion

Design and Applications of SDH Cross-Connection ASIC

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Design and Applications of SDH Cross-Connection ASIC

2000 International Conference on Communication Technology(WCC2000·ICCT2000)

作者： Rong Peng Jin Depeng z.ng lieguang State key lab on microwave ＆ digital communication Tsinghua University

ISBN: (纸本)0780363949

＜正＞The development of Synchroniz.ng Digital Hierarchy（SDH） technique relies on the evolution of *** paper introduces a novel SDH crossconnection ASIC designed by the E＆E Department of Tsinghua *** chip can Provide nonblocking cross-connection based on any combination of TU channels between eight STM-1 input streams and eight STM-1 output *** a newly developed built-in test circuit is embedded within the *** paper also analyses its timing performance and presents its applications.

关键词： SDH Cross-Connection ASIC

Analysis and Improvement of High-speed SDH Frame Alignment

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Analysis and Improvement of High-speed SDH Frame Alignment

2000 International Conference on Communication Technology(WCC2000·ICCT2000)

作者： Sha Yanping Wang Hansheng z.ng lieguang Dept. of Electronic Engineering Tsinghua University

ISBN: (纸本)0780363949

＜正＞Frame aligner is a key part in digital multiplexer/demultiplexer.A novel error tolerant frame alignment methodology is presented in this *** shows that this method complies with ITU-T recommendation and improves the *** parameters of frame aligner and framing pattern are carefiilly *** the parallel realiz.tion of frame aligner with the proposed method which can lowers the working frequency and power is applied in STM-4 system.

关键词： frame alignment SDH STM

PERFORMANCE ANALYSIS OF BIP CODES IN SDH ON POISSON DISTRIBUTION OF ERRORS

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PERFORMANCE ANALYSIS OF BIP CODES IN SDH ON POISSON DISTRIBU...

1996 International Conference on Communication Technology

作者： z.ang Xiaoru z.ng lieguang Dept.of Electronic Engineering Tsinghua University

This paper introduces in some details the bit interleaved parity(BIP) codes adopted in SDH for error monitoring,and derives the general relationship equation between BIP error block probability and

ISBN: (纸本)0780329163

This paper introduces in some details the bit interleaved parity(BIP) codes adopted in SDH for error monitoring,and derives the general relationship equation between BIP error block probability and

关键词： synchronous digital hierarchy BIP codes performance analysis bit interleaved parity codes SDH error monitoring error block probability bit error rate BER Poisson distribution errors