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1、Wireless Network Lab,NCTU,Taiwan,1,無線系統實驗室Wireless System Lab(ED900/913B),Li-Chun Wang(王蒞君)Department of Communications Engineering National Chiao Tung UniversityHsinchu,Taiwanhttp:/lichun,Wireless Network Lab,NCTU,Taiwan,2,3C Tradeoff in Wireless,The 3C(Capacity,Cost,Cwality)TradeoffThe more things
2、 changes,the more remain the same(Alphonse Karr,1808),High Capacity,Good Quality,Low Cost,Wireless Network Lab,NCTU,Taiwan,3,What is the fundamental issue for wireless communications?,Spectrum Efficiency,Wireless Network Lab,NCTU,Taiwan,4,Missions,建立學生對無線通訊的系統整體概念。研發 Cross-Layer Design的關鍵技術包括無線通訊實體層
3、和無線資源管理 技術。實驗室的座右銘學生為本，創意至上。Think Big!Think Different!Think Simple!,Wireless Network Lab,NCTU,Taiwan,5,個人學歷,19821986 國立交通大學 控制工程系 學士 19861988 國立台灣大學 電機研究所 碩士19921995 美國喬治亞理工學院 碩士Georgia Institute of Technology,Master of Science19951996 美國喬治亞理工學院 博士Georgia Institute of Technology,Ph.D.博士論文:Channel Mo
4、deling and Architecture Design for Cellular-Based Personal Communications,Wireless Network Lab,NCTU,Taiwan,6,個人經歷,1990/071992/08 交通部電信研究所傳輸研究室,助理研究員1995/011995/06 Nortel,BNR,Dallas,TX,Co-Op1996/072000/01 AT&T Labs-Research,Holmdel,NJ Wireless Communication Research Department,Senior Member of Techni
5、cal Staff 2000/022000/08 清華大學電機工程系 助理教授2000/08迄今交通大學電信工程系 副教授2002/01迄今NCTU Cisco Academy Training Center,Cisco Certified Academy Instructor,Wireless Network Lab,NCTU,Taiwan,7,專業領域-無線系統技術,著重無線系統中之跨階層適應技術(Cross-layer Link Adaptation and Protocol Design)、無線資源管理(Radio Resource Management)技術:MIMO無線系統;MIM
6、O 超寬頻無線電系統(Ultra-Wide Band,UWB)Wireless Mesh NetworkCross-Layer Link Adaptation TechniquesAdvanced CDMA之無線資源管理技術:Cooperative Cognitive Radio,Wireless Network Lab,NCTU,Taiwan,8,Professional Services,Journal/Special Issue Editor:Associate Editor,IEEE Transaction on Wireless Communications,2001 2005Ass
7、ociate Editor,International Journal of Sensor Networks(2005 now)Associate Editor,International Journal on Wireless Mobile Computing(2005 now)Guest Editor,Special Issue on Radio Resource Management and Protocol Engineering in Future IEEE Broadband Networks for IEEE Wireless Communications Magazine,20
8、06Guest Editor,Special Issue on Mobile Computing and Networking”of IEEE Journal on Selected Areas in Communications,Vol.23,No.6,June 2005.,Wireless Network Lab,NCTU,Taiwan,9,Honors,1997 IEEE Vehicular Technology Society Jack Neubauer Memorial Award for the Best Paper of the Year on the Subject of Ve
9、hicular Technology Systems.傑出畢業生陳瓊璋(95年博士畢)中華電信研究所經理96年傑出青年工程師元智大學助理教授(to be official on 97)龍騰論文獎張志文(96年博士畢)成大電機助理教授陳磊(93碩士畢)中國工程師傑出論文獎謝昆瑾(92碩士畢)國科會碩士論文獎,Wireless Network Lab,NCTU,Taiwan,10,研究理念與過程,研究最先進理論率先提出MIMO Scheduling 系統中之Soft Coverage 觀念，建立MIMO Scheduling 系統正確的研究方向及新的研究領域，預期對未來Multiuser MIMO
10、 Systems將有重要貢獻。率先研究整合MIMO與UWB兩技術之間的Performance Tradeoff Analysis Model，提醒學術界避免往不正確的方向繼續發展。與國際接軌積極參與重要國際會議每年均有論文發表於ICC或Globecom等Flagship International Conference。在國際會議上給Tutorial Course，IEEE VTC 2003 Spring，IEEE VTC 2007 Spring and Fall,IEEE PIMRC。受邀至國外知名大學及研究單位，包括美國 Caltech、University of Florida、WINL
11、AB、Bell Labs、香港大學、和香港科技大學演講，讓研究成果被世界頂尖學者知道並接受他們的考驗，進一步建立學術交流機會。,Wireless Network Lab,NCTU,Taiwan,11,People,博士後研究員黃建華、鍾文敬(report on 2008)。博士陳銘賓、劉維正、王中瑋、葉俥榮、Samer Talat。碩士盧盈志、黃偉賢、蘇文山、陳政敏、陳皓、嚴語麟、Diego Ballesteros。專題王文新、楊峻民、蔣明虔。,Wireless Network Lab,NCTU,Taiwan,12,Current Research,Cognitive Radio（感知無線電）
12、Sponsor:國科會(2005.82008.7)Subjects:Cognitive MAC Protocol（陳銘賓）Concurrent Transmission MAC Protocol（王中瑋）QoS-based Cognitive Scheduling(Samer Talat)Ultra-Wide Band(UWB)Sponsor:國科會(2004.82007.7)Subject:MIMO-UWB MIMO Ad Hoc ChannelsSpace-Time-Frequency Coding（劉維正),Wireless Network Lab,NCTU,Taiwan,13,Curr
13、ent Research,Intelligent Transport SystemSponsor:教育部卓越計劃（2006.32009.2)Subject:Vehicular Network（黃建華)Wireless Mesh Network（黃建華)Network-Coordination for Multi-Cell OFDM SystemSponsor:工研院(2007.1 2007.12)Joint base station coordination and user scheduling（葉俥榮),Wireless Network Lab,NCTU,Taiwan,14,New Pro
14、ject,Cooperative Cognitive Radio NetworkSponsor:國科會(2007.82010.7)Subject:Cooperative Sensing and Robust Topology Control techniques Cooperative Cognitive MAC Protocol Multiplexing-based Cooperative Multi-hop systems,Wireless Network Lab,NCTU,Taiwan,15,Multiuser Scheduling for MIMO Wireless Networks,
15、Wireless Network Lab,NCTU,Taiwan,16,Background on MIMO Techniques,Independent parallel transmit and receive antenna pairMIMO antenna techniques boost channel capacity enhance link reliability reject strong interference,Tx,Rx,Nt,Nr,Wireless Network Lab,NCTU,Taiwan,17,Major Challenges for MIMO Techniq
16、ues,Difficulties to simultaneously leverage the benefits of diversity and multiplexing e.g.diversity-multiplexing tradeoff(huge capacity gain may come at a price of reduced link reliability)implementation complexity,Wireless Network Lab,NCTU,Taiwan,18,Diversity-Multiplexing Tradeoff,Diversity-improv
17、e link reliability by replicasMultuplexing-enhance data rate by multiplexing,Tx,Rx,a,a,a,a,Tx,Rx,a,b,a+b,b+a,ba,a,a,ba,subchannel interference canceling is required,Wireless Network Lab,NCTU,Taiwan,19,Background on Scheduling Techniques,Through periodically selecting the best user to serve,the syste
18、m performance is improved by exploiting multiuser diversity or cooperative diversity.Ordered Statistics is the fundamental mathematical techniques for analyzing the scheduling wireless systems.,Wireless Network Lab,NCTU,Taiwan,20,A Multiuser MIMO Scheduling System,Perfect SNR estimation and noiseles
19、s feedback Hk=hij(k),each hij(k)is subject to Nakagami fading The BS selects the target user with highest effective SNR,Wireless Network Lab,NCTU,Taiwan,21,Effect of SWNSF Scheduling on min,SWNSF scheduling enhances the output SNR of the weakest subchannel,3 2 1,Wireless Network Lab,NCTU,Taiwan,22,E
20、ffect of SWNSF Scheduling on Coverage,MS,MIMO+RR Scheduling,MS,MIMO+SWNSF Scheduling(“soft”coverage depends on K),Wireless Network Lab,NCTU,Taiwan,23,Coverage Extension&Capacity Improvement,number of antennas,number of users,Wireless Network Lab,NCTU,Taiwan,24,Publications,Scheduling for MIMO System
21、sChiung-Jang Chen and Li-Chun Wang,“A Unified Capacity Analysis for Wireless Systems with Joint Multiuser Scheduling and Antenna Diversity in Nakagami Fading Channels,”IEEE Trans.on Communications,vol.54,No.3,pp.469478,Mar.2006.Chiung-Jang Chen and Li-Chun Wang,Enhancing Coverage and Capacity for Mu
22、ltiuser MIMO Systems by Utilizing Scheduling,IEEE Trans.on Wireless Communications,Vol.5,No.5,pp.1148-1157,May 2006.Chiung-Jang Chen and Li-Chun Wang,Impacts of Radio Channel Characteristics,Heterogenous Traffic Intensity and Near-Far Effect on Rate Adaptive Scheduling Algorithms,IEEE Trans.on Vehic
23、ular Technology,Vol.55,No.5,pp.15441554,Sep.2006Chiung-Jang Chen and Li-Chun Wang,“Performance Analysis of Scheduling in Multiuser MIMO Systems with Zero-Forcing Receivers,”IEEE Journal of Selected Area in Communication,July 2007.Li-Chun Wang and Chu-Jung Yeh,“Comparison of Scalar Feedback Mechanism
24、s in MIMO Scheduling Systems,”Wireless Personal Mulitmedia(WPMC),pp.1172-1176,Sep.2005.Li-Chun Wang and Chu-Jung Yeh,“On the Performance of Zero-Forcing Beamforming for MIMO Broadcast Systems,”2007 IEEE AP-S International Symposium on Antennas and Propagation in Honolulu,Hawaii,USA,June 2007,Wireles
25、s Network Lab,NCTU,Taiwan,25,MIMO Ultra-Wideband Li-Chun Wang,Wei-Cheng Liu,and Kuan-Jiin Shieh,“On the performance of using multiple transmit and receive antennas in pulse based ultra-wideband systems,”IEEE Transactions on Wireless Communications,vol.4,no.6,pp.2738-2750,Nov.2005.Wei-Cheng Liu and L
26、i-Chun Wang,“Performance analysis of pulse based ultra-wideband systems in the highly frequency selective fading channel with cluster property,”VTC2006-Spring.Wireless Mesh Network:Jane-Hwa Huang,Li-Chun Wang,and Chung-Ju Chang,“Coverage and Capacity of A Wireless Mesh Network”,IEEE International Co
27、nference on Wireless Networks,Communications and Mobile Computing,pp.458463,June 2005.Jane-Hwa Huang,Li-Chun Wang,and Chung-Ju Chang,“Deployment Strategies of Access Points for Outdoor Wireless Local Area Networks,”IEEE VTC 2005,pp.29492953,May 2005.Jane-Hwa Huang,Li-Chun Wang,and Chung-Ju Chang,“Co
28、verage Enhancement for a Multi-channel Ring-based Wireless Mesh Network with Guaranteed Throughput and Delay,”IEEE ICC 2006.,Wireless Network Lab,NCTU,Taiwan,26,Advanced CDMA Systems Li-Chun Wang and Chih-Wen Chang,“On the Performance of Multicarrier DS-CDMA with Imperfect Power Control and Variable
29、 Spreading Factors,”IEEE Journal on Selected Areas in Communications,Special issue on Advances in Multicarrier CDMA,Vol.24,No.6,pp.1154-1166,June 2006.Li-Chun Wang and Chih-Wen Chang,“Probability of false power control command in CDMA systems subject to measurement errors,”IEEE Communications Letter
30、s,vol.9,no.4,pp.298-300,Apr.2005.Ching-Yu Liao,Li-Chun Wang and Chung-Ju Chang,Comparison of Downlink Power Allocation Mechanisms in Soft Handoff for the WCDMA System with Heterogeneous Cell Structures,ACM/Kluwer Wireless Network,pp.593-605,Nov.2005(EI,SCI:1.17)Chih-Min Chao,Yu-Chee Tseng,Li-Chun Wa
31、ng,“Reducing Internal and External Fragmentations of OVSF Codes in WCDMA Systems with Multiple Codes,”IEEE Trans.on Wireless Communications,Vol.4,No.4,pp.15161526,July 2005(EI,SCI:1.232),Wireless Network Lab,NCTU,Taiwan,27,Advanced CDMA Systems Chih-Min Chao,Yu-Chee Tseng,Li-Chun Wang,“Dynamic Bandw
32、idth Allocation for Multimedia Traffic with Rate Guarantee and Fair Access in WCDMA Systems,IEEE Trans.on Mobile Computing,Vol.4,No.5,pp.420429,Sep./Oct.2005Li-Chun Wang,Shi-Yen Huang,and Yu-Chee Tseng,Interference Analysis and Resource Allocation for TDD-CDMA Systems to Support Asymmetric Services
33、by Using Directional Antennas,IEEE Trans.on Vehicular Technology,Vol.54,No.3,pp.1056-1069,May 2005 Li-Chun Wang,Ming-Chi Chen and Yi-Cheng Chen,A Cross-layer Cost-function Based Rate Adaptation Mechanism for the WCDMA System with Multi-class Services by Transport Format Selection,Wireless Communicat
34、ions and Mobile Computing(Wiley Inter Science),Vol.5,No.4,pp.397 406,July 2005.Li-Chun Wang and Chih-Wen Chang,“An interference avoidance code assignment strategy for MC-DS-CDMA with TF-domain Spreading,”accepted by IEEE International Conference on Communications 2006.,Wireless Network Lab,NCTU,Taiw
35、an,28,Fast HARQ for HSDPALi-Chun Wang and Chih-Wen Chang,“Gap Processing Time Analysis for Stall Avoidance Mechanisms for High Speed Downlink Packet Access with Parallel HARQ Schemes,”IEEE Trans.on Mobile Computing,Vol.5,No.11,pp.1591-1605,Nov.2006.Li-Chun Wang,Chih-Wen Chang,and Chung-Ju Chang,“On
36、the Performance of Indicator-based Stall Avoidance for High-Speed Downlink Packet Access Systems,”IEEE Trans.on Vehicular Technology,Vol.55,No.2,pp.691 703,March 2006.Cross-Layer Protocol Design for WLAN and Sensor NetworkL.C.Wang and C.H.Lee,“A TCP-physical cross-layer congestion control mechanism
37、for the multirate WCDMA system using explicit rate change notification,IEEE International Conference on Advanced Information Networking and Application,vol.2,pp.449-452,Mar 2005.Li-Chun Wang,Chung-Wei Wang,and Chuan-Ming Liu,“Adaptive Contention Window-based Cluster Head Election Algorithms for Wire
38、less Sensor Networks,”appeared in the VTC05 Fall.Li-Chun Wang,Hung-Hsi Chen,and Anderson Chen,“Optimal Channel Search Time for Handoff in the IEEE 802.11 WLANs”,to appear in VTC2006-Spring.Li-Chun Wang,Kuang-Nan Yen,and Anderson Chen,“Joint Rate and Power Adaptation for Wireless Local Area Networks in Nakagami Fading Channels,”to appear in IEEE WCNC,Apr.2006,
