I received my Ph.D. degree from the Department
of Electrical Engineering and Computer Science (EECS) at
the University of California, Irvine (UCI), working
with Professor
Hamid Jafarkhani.
I am currently employed by Broadcom
Corporation
as a staff scientist.
Research
My major research interests are
communications theory, wireless communications, signal processing, and
information theory.
I was working for an ARO Multi University Research Initative
(MURI)
project on space-time processing for tactical Ad-Hoc networks.
Thesis
Communication over multiple antenna fading channels using
quantized and erroneous feedback information
Full-text [PDF], slides [PS]
Using only the receiver knowledge about the fading
channel state, open-loop communication is possible. The main question, however,
is whether we can improve
these schemes using channel information at the
transmitter with a reasonable amount of complexity and overhead. In closed-loop
schemes, transmitter knowledge
of the channel conditions is usually obtained using a
feedback link from the receiver to the transmitter. Feedback information must
be communicated over a reverse
channel in an adequately reliable and quick fashion.
This is because communication over each realization of the channel cannot begin
before the feedback link is
established. Moreover, the amount of communication
resources, such as bandwidth and power dedicated to feedback information must
be kept minimal so as not
to significantly affect the rest of the network and to
impose the least possible interferences on other users. Should we keep the
feedback information scarce, low
power, and prompt, we cannot help facing the issue of
unreliable feedback information. Feedback errors and mismatches are extra
sources of errors in a close-loop
system, degrading performance severely (even worse
than an open-loop scheme). Our main focus in this study is to prevent this
phenomenon and to design reliable
and high-rate communication schemes when the knowledge
of the transmitter about the channel condition is limited and erroneous.
Publications
Journal
Siavash Ekbatani, Farzad Etemadi, and Hamid Jafarkhani, “Throughput maximization over slowly fading channels using erroneous and quantized feedback,” To appear in IEEE Transactions on Communications, 2008. PDF
Siavash Ekbatani and Hamid
Jafarkhani, “Combining beamforming and space-time coding using noisy
quantized feedback,” To appear in IEEE Transactions on Communications,
2008. PDF
Siavash Ekbatani, Farzad Etemadi, and Hamid Jafarkhani, “Outage behavior of
slow fading channels with power control using noisy quantized CSIT,”
Submitted to IEEE Transactions on Information Theory, 2008. PDF
Farzad Etemadi, Siavash Ekbatani, and Hamid Jafarkhani, “Joint source–channel coding for slowly fading channels with limited and noisy transmitter side information,” In revision in IEEE Transactions on Information Theory, 2008.
Siavash Ekbatani and Hamid Jafarkhani,
“Combining beamforming and space-time coding using quantized
feedback,” IEEE Transactions on Wireless Communications, Vol. 7, Issue 3,
pp. 898-908, March 2008. PDF
Javad Kazemitabar, Hamid Jafarkhani, and Siavash Ekbatani,
“Code design for rank-deficient
correlated channels,” IEE Electronics Letters, Vol. 41, October
2005.
Conference
S. Ekbatani, F. Etemadi, and H.
Jafarkhani, “Outage behavior of
quasi-static fading channels with partial power control and noisy feedback,”
IEEE Global Comm. Conf. (GLOBECOM -07), November 2007.
F. Etemadi,
S. Ekbatani and H. Jafarkhani, “Design of multi-antenna coded modulators
using noisy quantized channel state information,” IEEE Global
Comm. Conf. (GLOBECOM-06), November 2006.
S. Ekbatani, F. Fazel and H.
Jafarkhani, “Space-time
multi-block coding with covariance beam forming for mobile transceivers in
block-fading channels,” IEEE Wireless Comm. and Net. Conf.
(WCNC-06), April 2006.
S. Ekbatani and H. Jafarkhani “Novel space-time-frequency codes with
improved distance spectrum for mobile multi-path channels,” IEEE
Wireless Comm. and Networking Conf. (WCNC-06), April 2006.
S. Ekbatani, L. Liu and H. Jafarkhani, “A power loading scheme for space-time trellis
codes based on channel magnitude feedback,” IEEE Global Comm.
Conf. (GLOBECOM-05), November 2005.