Graduate Student,Electrical and Computer Engineering, Rice University, Houston, Tx-77005
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Research Summary
My
research has mainly focused on designing efficient multiple antenna systems to
support high data rates for future wireless applications. My important
contributions are as follows.
·
Feedback
Based Transmission Schemes:
We have
considered the problem of designing beamforming schemes for multiple antenna
systems in the presence of finite number of bits describing the channel
realization. While the ideal beamforming schemes result in good error
performance and low complexity receivers, the amount of feedback information
required can be impractical. We demonstrated that a significant portion of the
performance gains of the perfect channel beamforming schemes can be achieved
with only a few bits of channel information, and captured the relationship of
the number of feedback bits with the number of transmit antennas and error
performance. We have also developed a design criterion for the optimal
beamformers in the presence of finite rate feedback. Our ongoing research
investigates the problem of designing power control schemes coupled with
beamforming along with finite rate constraints on feedback, as well as the
extension of the design criterion to multiple receive antennas.
·
Enhanced
Dimensional Space Time Codes:
Space time code is a transmission scheme designed for multiple transmit
antenna systems, which achieves excellent performance even when channel state
information is not available at the transmitter. Most of the designs for space
time codes in the literature have relied on computer searches, which takes
away structure from the codes. We designed space time codes based on the full
diversity achieving Alamouti codes while maximizing the associated coding gain
using set partitioning principles of trellis coded modulation (TCM). The
resulting family of codes yields to a systematic design criterion while
exhibiting improved error performance over most of the space time codes in
literature. The structure present in the codes can potentially be exploited to
help reduce the complexity of the decoder.
· Undergraduate Project: We implemented the 802.11b standards for Wireless LAN in hardware as a group of three students. My work consisted of designing the entire baseband components of the transmitter and the receiver, and implementing the design in hardware. The work involved programming Analog Devices DSP (ADSP 2181) in assembly language, developing schematics for Xilinx FPGA (3195A) and designing a PC card for the ISA bus with the above components. We successfully demonstrated the working of the system and were awarded the best undergraduate project award at IIT Madras.
K. Kiran Mukkavilli, Ashutosh Sabharwal, Elza Erkip and Behnaam Aazhang, On Beamforming with Finite Rate Feedback in Multiple Antenna Systems, IEEE transactions on Information Theory, vol. 49, no. 10, pp. 2562-2579, October 2003.
D.Mihai Ionescu, K. Kiran Mukkavilli, Zhiyuan Yan and Jorma Lilleberg, Improved 8- and 16- state Space Time Codes for 4PSK with Two Transmit Antennas,in IEEE Communications Letters, Vol. 5, July 2001.
K. Kiran Mukkavilli, Ashu Sabharwal and Behnaam Aazhang, Generalized Beamforming for MIMO Systems with Limited Transmitter Information, in Proc. of 37th Asilomar conference on signals, systems and computers, November 2003.
Krishna Kiran Mukkavilli, Ashu Sabharwal, Elza Erkip and Behnaam Aazhang, Beamformer Design with Feedback Rate Constraints : Criteria and Constructions, in Proc. of International Symposium on Information Theory, Yokohama, Japan, June 2003.
Krishna Kiran Mukkavilli, Ashu Sabharwal, Elza Erkip and Behnaam Aazhang, Performance limits on beamforming with finite rate feedback for multiple antenna systems, in Proc. of 36th Asilomar conference on signals, systems and computers, pp 536-540, November 2002.
Krishna Kiran Mukkavilli, Ashu Sabharwal and Behnaam Aazhang, Finite rate feedback design for multiple transmit antennas, in Proc. of 40th Allerton conference on communication, control and computing, October 2002. (invited paper)
Krishna K. Mukkavilli, Tarik Muharemovic, A. Sabharwal and Behnaam Aazhang, On the outage proabability of a class of signaling schemes for multiple antennas, in the proceedings of ISIT, Lausanne, Switzerland, June 2002.
Krishna K. Mukkavilli, A. Sabharwal and Behnaam Aazhang, Design of Multiple Antenna Coding Schemes with Channel Feedback, in the proceedings of 35th Asilomar Conference on Signals, Systems and Computers, pp 1009-1013, November 2001
Krishna K. Mukkavilli, Ashutosh Sabharwal, Michael Orchard and Behnaam Aazhang, Transmit Diversity with Channel Feedback, in Proc. Intl. Symposium on Telecommunications, Tehran, Iran, Septemeber 2001.
Krishna K.Mukkavilli, D.Ionescu and Behnaam Aazhang, Design of Space-Time Codes with Optimal Coding Gain, in Proc. IEEE International Conference on Personal, Indoor and Mobile Radio Communication, PIMRC,London, UK, pp 495-499, September 2000.
DH2045, Duncan Hall, MS 366, Rice University, Houston, Tx-77005
Page last updated : 01/30/03