- Date & Time: Thursday, June 2, 2011; 12:00 PM
Speaker: Ramesh Annavajjala, MERL
MERL Host: Philip V. Orlik Abstract - For orthogonal frequency-division multiplexing (OFDM) based wireless systems, a resource block (RB) in a two-dimensional time-frequency plane is defined as a data block spanned by a number of consecutive OFDM symbols over a number of consecutive subcarriers. Traditionally, RBs contain modulation symbols for data transmission and pilot symbols for channel estimation.
In this talk, I present a novel approach to RB designs for OFDM systems with multiple antennas at the transmitter and the receiver (i.e., MIMO-OFDM). The proposed approach, termed resource block embedding, does not require explicit pilot symbols to estimate the channel at the receiver, and hence reduces the channel estimation overhead significantly. I describe, in detail, the encoding and decoding algorithms for our proposed embedded resource blocks (ERB) for single-user single-antenna transmission, two transmitter antenna Alamouti code, four transmitter antenna stacked Alamouti code, and multi-stream spatial multiplexing. I also outline construction of ERBs for multi-user MIMO systems.
This is a joint work with Phil Orlik and Jin Zhang.
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- Date: November 2, 2010
Where: SmartGrids China
MERL Contact: Jinyun Zhang
Research Area: Electric Systems
Brief - The paper "The Latest Development of SmartGrid" by Zhang, J. was presented at SmartGrids China.
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- Date: September 7, 2010
Where: International Conference on Human-Computer Interaction with Mobile Devices and Services (MobileHCI)
Research Area: Speech & Audio
Brief - The paper "Contextual Push-to-talk: Shortening Voice Dialogs to Improve Driving Performance" by Weinberg, G., Harsham, B., Forlines, C. and Medenica, Z. was presented at the International Conference on Human-Computer Interaction with Mobile Devices and Services (MobileHCI).
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- Date: November 30, 2009
Where: IEEE Global Telecommunications Conference (GLOBECOM)
MERL Contacts: Jinyun Zhang; Philip V. Orlik; Toshiaki Koike-Akino Brief - The papers "Relay Selection and Data Transmission Throughput Tradeoff in Cooperative Systems" by Shah, V., Mehta, N.B. and Yim, M.H.R., "Medium Access Control Signaling for Reliable Spectrum Agile Radios" by Azarnasab, E., Chen, R.-R., Teo, K.H., Tao, Z. and Farhang-Boroujeny, B., "Unified Analysis of Linear Block Precoding for Distributed Antenna Systems" by Koike-Akino, T., Molisch, A.F., Tao, Z., Orlik, P.V. and Kuze, T., "Multi-user Cooperative Communications with Relay-Coding for Uplink IMT-Advanced 4G Systems" by Cao, L., Zhang, J. and Kanno, N., "Error Control Strategies for WiMAX Multi-Hop Relay Networks" by Fu, W., Tao, Z., Zhang, J. and Agrawal, D.P., "Opportunistic Cell Edge Selection in Multi-Cell OFDMA Networks" by Au-Yeung, C.K., Maaref, A. and Zhang, J. and "A New Coupling Channel Estimator for Cross-Talk Cancellation at Wireless Relay Stations" by Ma, J., Li, G.Y., Zhang, J., Kuze, T. and Iura, H. were presented at the IEEE Global Telecommunications Conference (GLOBECOM).
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- Date: September 15, 2009
Where: International Conference on Human-Computer Interaction with Mobile Devices and Services (MobileHCI)
Research Area: Speech & Audio
Brief - The paper "Contextual Push-to-Talk: A New Technique for Reducing Voice Dialog Duration" by Weinberg, G.L. was presented at the International Conference on Human-Computer Interaction with Mobile Devices and Services (MobileHCI).
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- Date: September 17, 2008
Where: IEEE International Conference on Automatic Face and Gesture Recognition (FG) Brief - The papers "Ambient Intelligence as the Bridge to the Future of Pervasive Computing" by Wren, C.R. and Ivanov, Y.A. and "Recognizing Talking Faces from Acoustic Doppler Reflections" by Kalgaonkar, K. and Raj, B. were presented at the IEEE International Conference on Automatic Face and Gesture Recognition (FG).
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- Date: March 16, 2007
Awarded to: Michael Seltzer
Awarded for: "Likelihood-Maximizing Beamforming for Robust Hands-free Speech Recognition"
Awarded by: IEEE Signal Processing Society
Research Area: Speech & Audio
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- Date: May 21, 2006
Where: IEEE International Symposium on Circuits and Systems (ISCAS) Brief - The papers "Computing During Supply Voltage Switching in DVS Enabled Real-time Processors" by Duan, C. and Khatri, S.P. and "Memory-based Cross-talk Canceling CODECs for On-chip Buses" by Duan, C., Gulati, K. and Khatri, S. were presented at the IEEE International Symposium on Circuits and Systems (ISCAS).
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- Date: May 1, 2006
Awarded to: Christopher Wren and Emmanuel Munguia Tapia
Awarded for: "Toward Scalable Activity Recognition for Sensor Networks"
Awarded by: Second International Workshop in Location and Context-Awareness (LoCA) Brief - MERL researcher Christopher Wren received the Best Presentation award for his talk on "Toward Scalable Activity Recognition for Sensor Networks".
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- Date: October 15, 2005
Where: SPIE Conference on Multimedia systems and Applications
Research Area: Digital Video
Brief - The paper "Browsing News and Talk Video on a Consumer Electronics Platform Using Face Detection" by Peker, K.A., Divakaran, A. and Lanning, T. was presented at the SPIE Conference on Multimedia systems and Applications.
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- Date: September 30, 2004
Where: IEEE Transactions on Speech and Audio Processing
Research Area: Speech & Audio
Brief - The article "Likelihood-Maximizing Beamforming for Robust Hands-Free Speech Recognition" by Seltzer, M.L., Raj, B. and Stern, R.M. was published in IEEE Transactions on Speech and Audio Processing.
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- Date: July 14, 2002
Where: World Multi-Conference on Systemics, Cybernetics and Informatics (ISAS-SCI)
MERL Contacts: Philip V. Orlik; Jinyun Zhang; Anthony Vetro Brief - The papers "Timing Synchronization for OFDM" by You, C., Gu, D. and Zhang, J., "An Online Renegotiation-Based Bandwidth Management with Circuit Assignment for VBR Traffic in Communications Networks" by Porikli, F.M. and Sahinoglu, Z., "A Trellis Based Technique for Blind Channel Estimation and Signal Detection" by Cao, L., Orlik, P.V., Gu, D. and Zhang, J., "Automatic Detection of Talking Head Segments in News Video in the Compressed Domain" by Radhakrishnan, R. and Divakaran, A., "Channel Estimation Error Impact on the Link Level Performance of Space-Time Coded Systems" by Li, L., Zhang, J. and Horng, J.H., "Map-Top Video Surveillance with Adaptive Video Delivery" by Kuwahara, N., Hata, T. and Vetro, A., "Study of Rate 1/4 HSDPA Turbo Codes and Scaling Effect" by Orlik, P.V., Derand, T., Horng, J.H. and Wang, D. and "A Date Reduction Procedure for 'Principal Cast' and other 'Talking Head' Detection" by Radhakrishnan, R. and Divakaran, A. were presented at the World Multi-Conference on Systemics, Cybernetics and Informatics (ISAS-SCI).
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- Date: January 23, 2002
Where: SPIE Conference on Storage and Retrieval for Media Databases Brief - The papers "Data Reduction Procedure for \'Principal-Cast\' and other \'Talking-Head\' Detection" by Divakaran, A. and Radhakrishnan, R. and "Rapid Generation of Sports Video Highlights Using the MPEG-7 Motion Activity Descriptor" by Peker, K.A., Cabasson, R. and Divakaran, A. were presented at the SPIE Conference on Storage and Retrieval for Media Databases.
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