Massive MIMO: Communicating in the Near Field of a Large Aperture Massive Array System

agerasiaetherealΤεχνίτη Νοημοσύνη και Ρομποτική

24 Νοε 2013 (πριν από 3 χρόνια και 10 μήνες)

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Massive MIMO
:
Communicating in the Near Field of a Large Aperture
Massive Array Syste
m




Supervisor

Elisabeth de Carvalho
, edc@es.aau.dk



Project Description





Massive MIMO
[RPL
+
12]
has been recently introduced for cellular networks. In a massive
array system, the base stations are equipped with a very large number of antennas. While 4G
base stations are expected to have at most 8 antennas, massive BS will
be equipped with

a
number of

antennas
,

larger than 100

and
as high as 1000. The main enabler of such

systems is
the multi
-
antenna processing at the massive array, which focuses the energy very precisely
towards the end user. Therefore no energy is lost in

other directions. This enabl
es

a longer
communication reach, hence a bette
r coverage, very high rates, extreme energy efficiency and
reduced

inter
-
cell interference.

In this project, we propose to extend to concept of massive MIMO to
an
indoor scenario where
a massive array

of large aperture
is deployed
to serve as access points for wireless
communications in new infrastructures, such as airport halls, shopping malls, stadium, concert
stages, etc. Such a large aperture massive array system (LA
-
MASS) is conceived as part of t
he
new infrastructure and is integrated in its construction. Our general objective is the study of
LA
-
MASS in such a hot
-
spot area in a multi
-
user setting where a large array serves multiple
users simultaneously.

The main characteristic

of LA
-
MASS

is that
communications happen

in
the near
-
field

of the array
.

The project contains 2 main
components:



Channel characterization
: the purpose is to exhibit the main properties
of the channel
in the near field of the massive array
,

including the following aspects:
number of
degrees of freedom in the channel, conditioning of the channel, correlation between
users
, 2D and 3D array configurations
. Note that a simulator has been already
Figure
1
. Example of deployment of a large aperture
array in an indoor environment

developed accounting
for
the line of sight propagation

[A06] [JI05] [SN05]
.
The
stud
ents are expected to bui
l
d on the existing simulator where d
ifferent scattering
distribution will be included.




Communication design
: the purpose is an appropriate
beamforming design that is
adapted to channel characteristics in the near
-
field.
The focus
will be given on designs
that have a low computational complexity. S
chemes that
are based on full channel
knowledge, or only sta
tistics of the channel can be

considered.


Expected Outcome

The students will
acquire a deep knowledge on MIMO communications, including
propagation, signal processing and information theory

aspects
. The students will learn and
simulate the main MIMO transmission techniques and adapt them to a propagation
environment that is differe
nt from the environment for which MIMO has been originally
proposed.



Prerequisites



Mathematical and statistics fundame
ntals



Linear Algebra



P
ropagation fundamentals



Matlab.



References

[RPL
+
12] F. Rusek, D. Persson, B. K. Lau, E. G. Larsson, T. L.
Marzetta, O. Edfors and F.
Tufvesson, “Scaling up MIMO: Opportunities and Challenges with Very Large Arrays”, IEEE
Signal Processing Magazine, 2012,
http://arxiv.org/abs/1201.3210
.

[A06] J.B. Andersen, “Propag
ation aspects of MIMO channel modelling”, Space
-
Time
Wireless Systems: From Array Processing to MIMO Communications. ed. / H. Bolcskei; C.
Papadias; D. Gesbert; A
-
J van der Veen. Cambridge University Press, 2006.

[JI05] Jeng
-
Shiann Jiang and M.
-
A Ingram, "
Spherical
-
wave model for short
-
range MIMO,"
IEEE Transactions on

Communications
, Sept. 2005.

[SN05] I. Sarris and A.R. Nix, "Maximum MIMO Capacity in Line
-
of
-
Sight,"

Fifth
International Conference on

Inform
ation, Communications and Signal Processing,
2005.