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weidong xiang

Associate Professor
Electrical and Computer Engineering Department
University of Michigan-Dearborn

4901 Evergreen Rd.
Dearborn, MI. 48128
Office: 126 ELB
Phone: 313.593.5525
Email: xwd@umd.umich.edu
 


 

 

 

Research Interest

Please visit our website http://www.vehi-com.com/ for detail or Click here if you are from China

Brief Biography

Weidong Xiang received his M.S.E.E. and Ph.D. degrees from Tsinghua University, Beijing, China, in 1996 and 1999, respectively. From 1999 to 2004 he worked as a post-doctoral fellow and then a research scientist at the Software Radio Laboratory (SRL) at Georgia Institute of Technology, Atlanta. In September 2004, he joined the ECE Department, University of Michigan-Dearborn. His research interests include vehicular communications and networks, LTE, UWB, smart grid and wireless networked control system.

News

  1. A tutorial accepted at the IEEE CCNC 2012, Instructor: Weidong Xiang

High-speed at high-speed: Research and Prototyping Activities of Long Term Evolution (LTE) and Wireless Access for Vehicular Environments (WAVE) Systems Applied to Vehicles and High-Speed Trains.

Abstract: In this tutorial, we will share our leading-edge and unique experience on the research and prototyping of LTE and WAVE systems applied to both vehicular networks and high-speed train applications. The contents will cover latest progress in related areas ranging from channel modeling, baseband algorithms, prototyping and vehicular network simulator, system level channel emulator and field testing, all upon our recent research projects funded by NSF and CISCO Research Grant and an ongoing project of TD-LTE prototyping for high-speed trains supported by the China Government. At first, we will model the doubly selective channels in high mobility environments, which has not yet been well studied in the past literature. Both SISO and MIMO channels models, spatial and temporal attributes of channels and Doppler shift and spectrum will be studied, upon which innovative baseband algorithms will be invented to respond to the technical challenges arisen from fast time‐varying channels. Moreover, system level simulation built upon Matlab and C/C++ will be presented to evaluate the performance of LTE and WAVE systems.

Next, we will present the prototyping activities on LTE and WAVE systems based on field programmable gate array (FPGA) and DSP development boards and the implementation of real time baseband function blocks featuring with dedicated algorithms for high‐speed vehicles and trains. Associated field testing and experiment results will be thereafter reported and analyzed. The prototype can be used as functional onboard units (OBU) and roadside units (RSU) as well as the reference for next step specific integration circuits (ASIC) chip design.

After that, we will introduce a vehicular network simulator (VNS) that integrates TIGER database, channel models, OFDM format signals, MAC and network protocols, traffic models and driver behaviors. Down to the earth, the VNS that will be presented is one of the first simulation programs built upon from physical layer and capable of offering the parameters of coverage, channel fading, bit error rate (BER), packet error rate (PER), and packet latency as well as testing various protocols, schemes and applications.

In addition, we will present a channel emulator developed to emulate a moderate scale vehicular network by connecting tens of vehicles each having a MIMO configuration. Such a channel emulator is currently not available from both academy and industry but is highly in need in order to build up a controllable, cost efficiency and high confidence vehicular networks emulator upon hardware, instead of simulation, for both research and engineering purposes. Finally, we will update the status of several ongoing projects related to TD‐LTE for high-speed trains and WAVE prototyping and field testing.

  1. A Patent: Enhanced Carrier Frequency Estimator, Inventor: Weidong Xiang

Abstract: A method is provided for estimating a frequency offset in a carrier signal caused by the Doppler effect. The method determines a frequency offset estimate by utilizing a multi stage estimation scheme. More specifically, the method determines the frequency offset estimate of a data frame by iteratively estimating the frequency offset by comparing different portions of the preamble. As the length of the sampled patterns varies, the frequency offset estimates vary in accuracy and range. The method may adjust frequency offset estimates that are out of range. Finally, the receiver obtains a frequency offset estimate for the data frame from a weighted combination of frequency offset estimates. This method is applicable in WiFi (IEEE 802.11a/g), WiMax (IEEE 802.16), and WAVE (IEEE 802.11p) systems

Read more: http://www.faqs.org/patents/app/20090080576#ixzz1busvSNEN

Recent Journal Publication

  1. Y. Zhou, Y. Ji, W. Xiang, S. Addepalli, A. Guo, and F. Liu, “Heterogeneous Link Characterization Based on Multi-Keyhole Channel Model for Cooperative Diversity Wireless Communications,” IEICE Tans. Commun. 2011.

  2. Z. Gao, W. Xiang, Y. Zhao, J. Zhao, S. Cai, W. Pan, H. Jiang and H. Wang, “Random network coding-based optimal scheme for perfect wireless packet retransmission problems,” (Wiley) Wirel. Commun. Mob. Comput., 2011

  3. Sudhan Majhi, A. S. Madhukumar, A. B. Premkumar, W. Xiang and P. Richardson, “Enhancing Data Rates of TH-UWB Systems Using M-ary OPPM-BPSM Modulation Scheme: A System Perspective,” Springer Wireless Personal Commun., April 2010

  4. P. Richardson, Weidong Xiang and Dan Shan, “An outdoor UWB tracking system to improve safety of semi-autonomous vehicle operations,” Int. J. Ultra Wideband Commun. and Sys., vol. 1, no.3  pp. 209 – 221, 2010

 Recent Conference Presentation

  1.  Y. Zhou, Y. Ji, W. Xiang, S. Addepalli, A. Guo1, F. Liu, “On Eigenvalue and Capacity Distributions of Cooperative Multi-Keyhole Propagation Channels,”  7th IEEE Broadband wireless access workshop (BWA2011), IEEE Globecom 2011, Houston, US, 2011

  2.  H. Khani, H. Nie, W. Xiang, and Z. Chen, “Finite-Resolution Digital Receiver for High Rate Ultra-Wideband Weighted-Transmitted Reference System,” IEEE ICUWB 2011, Bologna, Italy, 2011.

  3.  (invited) S. Majhi, H. Qian, W. Xiang, S. Addepalli and Z. Gao. “Analysis of Outage Probability for Opportunistic Decode-and-Forward Relaying Network over Asymmetric Fading Channels,” The Third International Conference on Ubiquitous and Future Networks (ICUFN) 2011, Dalian, China, 2011.

 

Teaching

  1.   ECE570 Computer Networks, Winter 2011

Ongoing Projects

  1. NSF, IHCS, Collaborative Research: Multi-band Differential Code-Shifted Reference Technology for Ultra Wide Band Radio Applied to Intra-Vehicle Wireless Control and Communications Systems, $158,529.00, 7/1/2010 to 6/30/2013
  2. CISCO University Research Program Grant, Prototyping for Wireless Access for Vehicular Environments, $50,000, 2011

 

Funded Projects

  1. DoE, Argonne National Laboratory (ANL), Software Defined Radio (SDR) Prototype Based on the IEEE 802.15.4g Standard for Smart Grid, $46,938.00, 7/15/2010 to 1/14/2011
  1. NSF, MRI, "Acquisition of Instruments for the Research of Applying Ultra Wide Band Based Wireless Networks to Vehicles for Communications and Controls, $199,981, Weidong Xiang (PI), Wayne Stark, Paul Richardson and Taehyung Kim, 2008-2010
  1. Michigan University Commercialization Initiative (MUCI), Weidong Xiang (PI), Prototype for Wireless Access in Vehicular Environments (WAVE) Systems, 2008, $85,368

 

 

The last update date Oct. 26, 2011

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