📄 ee359 project_prateek bansal_adaptive loading for mimoofdm.mht
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Subject: EE359 Project
Date: Fri, 5 Mar 2004 11:36:03 +0800
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<CENTER><B><FONT size=3D+3>Adaptive loading for MIMO/OFDM=20
Systems<BR><BR></FONT></B><FONT size=3D+1>Prateek =
Bansal<BR>Andrew=20
=
Brzezinski<BR><BR><BR></FONT></CENTER><B>Abstract:</B><BR><BR>
<P style=3D"TEXT-ALIGN: justify">Orthogonal Frequency =
Division=20
Multiplexing (OFDM) is a powerful technique employed in=20
communications systems suffering from frequency selectivity. =
Combined with multiple antennas at the transmitter and =
receiver as=20
well as adaptive modulation, OFDM proves to be robust =
against=20
channel delay spread. Furthermore, it leads to significant =
data=20
rates with improved bit error performance over links having =
only a=20
single antenna at both the transmitter and receiver.</P>
<P style=3D"TEXT-ALIGN: justify">This project demonstrates =
OFDM with=20
adaptive modulation applied to Multiple-Input =
Multiple-Output (MIMO)=20
systems. We apply an optimization algorithm to obtain a bit =
and=20
power allocation for each subcarrier assuming instantaneous =
channel=20
knowledge. The analysis and simulation is considered in two =
stages.=20
The first stage involves the application of a variable-rate=20
variable-power MQAM technique for a Single-Input =
Single-Output=20
(SISO) OFDM system. This is compared with the performanc eof =
fixed=20
OFDM transmission where a constant rate is applied to each=20
subcarrier. The second stage applies adaptive modulation to =
a=20
general MIMO system by making use of the Singular Value=20
Decomposition to separate the MIMO channel into parallel=20
subchannels. For a two-input antenna, two-output antenna =
system, the=20
performance is compared with the performance of a system =
using=20
selection diversity at the transmitter and maximal ratio =
combining=20
at the receiver.</P><BR><BR><BR><B>Links:</B><BR><BR><A=20
=
href=3D"http://web.mit.edu/brzezin/www/359/initial.html">Project=20
Introduction and Task Division</A> <BR><A=20
href=3D"http://web.mit.edu/brzezin/www/359/359.pdf">Project =
Report</A>=20
<BR><A =
href=3D"http://web.mit.edu/brzezin/www/359/matlab">OFDM=20
Simulator</A> <BR><BR><BR>
<CENTER><A =
href=3D"http://www.mit.edu/~brzezin/school.html">BACK TO MY=20
SCHOOL PAGE</A>=20
=
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