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Publications

Ashutosh Sabharwal

Book Chapters

A. Sabharwal and B. Aazhang, "Multiuser Wireless Communication Systems,'' to appear in Encyclopedia of Communications , John Proakis (Editor), John Wiley and Sons, 2002

Patents

"Technique for wireless communications using a multi-sector antenna arrangement," US Patent #6127972, October 2000 (with D. Avidor, Lucent).

Journal Articles

Submitted

M. A. Khojastepour, A. Sabharwal and B. Aazhang," Cut-Set Theorems for Multi-state Networks", submitted to IEEE Transactions on Information Theory, November 2003.

Appeared / Accepted

B. Sadeghi, V. Kanodia, A. Sabharwal and E. Knightly, " OAR: A Multi-rate Media Access Protocol for Wireless Ad Hoc Networks", to appear in ACM Mobile Networking and Applications, 2003.
K. K. Mukkavilli, A. Sabharwal, E. Erkip and B. Aazhang, "On Beamforming with Finite Rate Feedback in Multiple Antenna Systems", accepted to IEEE Transactions on Information Theory (Special Issue on MIMO), 2003.
M. J. Borran, A. Sabharwal and B. Aazhang, "On Design Criteria and Construction of Non-coherent Space-time Constellations," accepted subject to revisions to IEEE Transactions on Information Theory (Special Issue on MIMO), 2003.
D. Rajan, A. Sabharwal, and B. Aazhang, "Delay-bounded Packet Scheduling of Bursty Traffic over Wireless Channels", accepted subject to minor revisions, IEEE Transactions on Information Theory , December 2002.
V. Kanodia, C. Li, A. Sabharwal, B. Sadeghi, and E. Knightly, "Distributed priority scheduling and medium access in ad hoc networks", ACM Wireless Networks, vol. 8, Nov 1, 2002 (invited article).
S. Bhashyam, A. Sabharwal and B. Aazhang, "Feedback Gain in Multiple Antenna Systems,'' IEEE Transactions on Communications, pp. 785-798, 50(5), May 2002.
A. Sabharwal and L. Potter, "Wald Statistic for Model Order Selection in Superposition Models", IEEE Transactions on Signal Processing, pp 956-965, 50(4), April 2002.
A. Sabharwal, U. Mitra and R. Moses,"MMSE Receivers for Multirate DS-CDMA Systems", IEEE Transactions on Communications, pp. 2184-2197, December 2001.
A. Sabharwal, D. Avidor and L. Potter, "Sector Beam Synthesis for Cellular Systems Using Phased Antenna Arrays", IEEE Transactions on Vehicular Technology, 49(5), pp. 1784-1792, September 2000.
C. J. Ying, A. Sabharwal and R. Moses, "A Combined Order Selection and Parameter Estimation Algorithm for Undamped Exponentials", IEEE Transactions on Signal Processing, 48(3), pp. 693-701, March 2000.
A. Sabharwal and L. Potter, "Convexly Constrained Linear Inverse Problems: Iterative Least-squares and Regularization", IEEE Transactions on Signal Processing, 46(9), pp. 2345-2352, September 1998.
A. Sabharwal and L. Potter, "Set Estimation via Ellipsoid Approximations: Theory and Algorithms", IEEE Transactions on Signal Processing, 45(12), pp. 3107-3112, December 1997.

Invited Conference Articles

K. K. Mukkavilli, A. Sabharwal and B. Aazhang, "Finite rate feedback design for multiple transmit antennas," 40th Allerton Conf. on Communications, Control and Computing, (Allerton, IL), October 2002.
A. Sabharwal, D. Rajan and B. Aazhang, "Dual problems in power control," 39th Allerton Conf. on Communication, Control and Computing., (Allerton, IL), October 2001.
D. Rajan, A. Sabharwal and B. Aazhang, "Impact of multiple access on uplink scheduling," Information Theory Workshop., (Cairns, Australia), September 2001.
K. K. Mukkavilli, A. Sabharwal, M. Orchard and B. Aazhang, "Space-time coding with feedback," Int. Symp on Telecommunications., (Teheran, Iran), September 2001.
M. Memarzadeh, A. Sabharwal and B. Aazhang, "Broadcast space-time coding," IT-COM., (Colorado), August 2001.
S, Bhashyam, A. Sabharwal and U. Mitra, "Channel Estimation for Multirate DS-CDMA Systems," for Asilomar., (Monterey, CA), October-November 2000.
A. Sabharwal, C. J. Ying, R. Moses and L. Potter, "Model Order Selection for Summation Models," 30th Asilomar Conf. on Signals, Systems and and Computers., (Pacific Grove, CA), pp. 1240-1244, November 1996.

Refereed Conference Articles

2003

R. Karrer, A. Sabharwal and E. Knightly, "Enabling large-scale wireless broadband: The case for TAPs," to be presented at 2nd Workshop on Hot Topics in Networks (HotNets-II) , November 2003.
M. A. Khojastepour and A. Sabharwal, "Performance bounds on scheduling with maximum delay constraints," 41st Allerton Conference on Communication, Control and Computing , July 2003.
U. Mitra and A. Sabharwal, " On achievable rates of complexity constrained relay channels," 41st Allerton Conference on Communication, Control and Computing , July 2003.
M. J. Borran, A. Sabharwal, B. Aazhang and P. Varshney, "Partially coherent constellations for multiple antenna systems," Asilomar Conference on Signals, Systems and Computers, November 2003.
K. K. Mukkavilli, A. Sabharwal and B. Aazhang, "Performance bounds on unit rank beamforming," Asilomar Conference on Signals, Systems and Computers, November 2003.
M. A. Khojastepour, A. Sabharwal and B. Aazhang, "On the capacity of Gaussian 'cheap' relay channel," accepted for presentation at GLOBECOM, December 2003.
A. Khoshnevis and A. Sabharwal, " Network channel estimation in cooperative wireless networks," Canadian Workshop on Information Theory (CWIT), pages 174-177, May 2003.
M. A. Khojastepour, A. Sabharwal and B. Aazhang, "Achievable rates for arbitrary network topologies with 'cheap' nodes," Canadian Workshop on Information Theory (CWIT), pages 28-31, May 2003.
M. A. Khojastepour, A. Sabharwal and B. Aazhang, "On the capacity of 'cheap' relay networks," 37th Annual Conference on Information Sciences and Systems (CISS), March 2003.
M. A. Khojastepour, A. Sabharwal and B. Aazhang, "Bounds on achievable rates for general multi-terminal networks with practical constraints," 2nd International Workshop on Information Processing in Sensor Networks (IPSN), pages 146-161, April 2003.
A. Chakrabarti, A. Sabharwal and B. Aazhang, "Using predictable mobility to reduce power consumption in sensor networks," 2nd International Workshop on Information Processing in Sensor Networks (IPSN), pages 129-145, April 2003.
K. K. Mukkavilli, A. Sabharwal, E. Erkip and B. Aazhang, "Beamformer design with feedback rate constraints: criteria and constructions," International Symposium on Information Theory (ISIT), page 414, July 2003.
M. J. Borran, A. Sabharwal and B. Aazhang, " Power Efficient Noncoherent Space-Time Constellations," International Symposium on Information Theory, page 208, July 2003.

2002

A. Sabharwal, "On capacity of relay-assisted communication," IEEE GLOBECOM, November 2002 (should have been titled "On routing in multi-hop communications").
K. K. Mukkavilli, A. Sabharwal and B. Aazhang, "Performance limits on beamforming with finite rate feedback for multiple antenna systems," 36th Asilomar Conference on Signals, Systems and Computers, November 2002.
B. Sadeghi, V. Kanodia, A. Sabharwal, and E. Knightly, "Opportunistic Media Access for Multirate Ad Hoc Networks,'' in Proceedings of ACM MOBICOM 2002, Atlanta, GA, September, 2002.
M. J. Borran, A. Sabharwal and B. Aazhang, "Constellations for imperfect channel state information at the receiver," 40th Allerton Conf. on Communications, Control and Computing, (Allerton, IL), October 2002.
V. Kanodia, B. Sadeghi, C. Li, A. Sabharwal, and E. Knightly, "Ordered packet scheduling in wireless ad hoc networks : mechanisms and performance tradeoffs", MOBIHOC , (Laussane, Switzerland), June 2002
M. J. Borran, A. Sabharwal, B. Aazhang and D. Johnson, "On design criteria and construction of non-coherent space-time constellations", ISIT , 2002
K. K. Mukkavilli, T. Muharemovic, A. Sabharwal and B. Aazhang, "On the Outage Probability of a Class of Signaling Schemes for Multiple Antennas", ISIT , 2002

2001

K. K. Mukkavilli, A. Sabharwal and B. Aazhang, "Design of Multiple Antenna Coding Schemes with Channel Feedback," 35th Asilomar Conference on Signals, Systems and Computers , pp 1009-1013, Nov. 2001
V. Kanodia, C. Li, A. Sabharwal, B. Sadeghi, and E. Knightly, "Distributed multi-hop scheduling and medium access with delay and throughput constraints", MOBICOM , (Rome, Italy), Aug 2001
D. Rajan, A. Sabharwal and B. Aazhang, "Delay and rate constrained transmission policies over wireless channels", accepted for presentation at GLOBECOM 2001 (San Antonio, TX), Nov. 2001.
D. Rajan, A. Sabharwal and B. Aazhang, "Transmission policies for bursty traffic sources on wireless channels", CISS 2001 .

1994-2000

A. Sabharwal, E. Erkip and B. Aazhang, "On Channel State Information in Multiple Antenna Block Fading Channels", accepted for presentation at ISITA , (Hawaii), November 2000.
A. Sabharwal, U. Mitra and R. Moses, "Low Complexity MMSE Receivers for Multirate DS-CDMA Systems", CISS , (Princeton), March 2000.
A. Sabharwal, U. Mitra and R. Moses, "Cyclic Wiener Filtering Based Multirate DS-CDMA Receivers", WCNC , (New Orleans), September 1999.
A. Sabharwal, D. Avidor and L. Potter, "Sector Beam Synthesis for Cellular Systems using Phased Antenna Arrays", WCNC , (New Orleans), September 1999.
A. Sabharwal and L. Potter, "Model Selection for Nested Model Classes with Cost Constraints", 9th IEEE Signal Processing Workshop on Statistical Signal and Array Processing, (Portland, OR), September 1998.
A. Sabharwal and L. Potter, "Linear Ill-posed Problems with Convex Constraints: Regularization with Stopping Rules", poster presentation, Society for Industrial and Applied Mathmatics (SIAM) Annual Meeting, (Kansas City, MO), July 1996.
C.-C. Huang, A. Sabharwal, Y. F. Zheng, and L. Potter, "Wavelet Packet Shrinkage Based Adaptive Sampling", Proc. of the International Conference on Acousticsm Speech and Signal Processing, (Atlanta, GA), pp. 1581-1584, May 1996.
A. Sabharwal and L. Potter, "Set Estimation via Ellipsoidal Approximations", Proc. of the International Conference on Acousticsm Speech and Signal Processing, ICASSP, (Detroit, MI), pp. 897-900, May 1995.
A. Sabharwal, V. Jandhyala and S. Prasad, "DCELP: A Low Bit Rate and Low Delay Speech Coding Method," Proc. of Int. Symp. on Speech, Image Proc. and Neural Networks, (Hong Kong), 1994.

Ph.D. Dissertation

A. Sabharwal, "Model Based Signal Processing for Communications and Radar Signal Reconstruction", Ph.D. Dissertation, The Ohio State University, 1999.

Master's Thesis

A. Sabharwal, "Constrained Signal Reconstruction", Master's thesis, The Ohio State University, 1995.

Technical Reports

A. Sabharwal, L. Potter and R. Moses, "On consistency of maximum likelihood estimates under overparametrization for stationary time series", IPS Laboratory Technical Report TR-96-02, The Ohio State University, 1997.
A. Sabharwal and L. Potter, "Some Results on Least-Squares and Regularization for Convexly Constrained LinearIinverse Problems; IPS Laboratory Technical Report TR-96-02, The Ohio State University, August 1996.
A. Sabharwal and L. Potter, "Radar Target Discrimination Features: A Review of Existing K-band and L-band Approaches," IPS Laboratory Technical Report TR-95-07, The Ohio State University, December 1995.
A. Sabharwal and L. Potter, "Set Estimation via Ellipsoidal Approximations : Theory and Algorithms," IPS Laboratory Technical Report TR-95-08, The Ohio State University, December 1995.

Last update: October 8, 2002

Ashutosh Sabharwal / ashu@rice.edu