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Trivellato, Matteo (2009) Wireless Systems with Quantized Information: Multiuser MIMO and Networked Control Systems. [Ph.D. thesis]

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Abstract (english)

This thesis deals with two multiuser wireless communication
systems: i) the multiple-input multiple-output (MIMO) broadcast
channel (BC) where a multi-antenna transmitter serves multiple
users along spatially multiplexed channels and ii) a networked
control system (NCS) where spatially distributed sensors,
controllers and actuators exchange information via a digital
wireless network in order to estimate or control a dynamical
system.

In MIMO BC, channel state information at transmitter (CSIT) is
essential to achieve spatial multiplexing across users. Special
interest is on frequency division duplexing systems where CSIT is
provided through limited uplink feedback (FB) from the receivers.
Either in case of single antenna or multi-antenna receivers the
main contributions are: i) the design of novel linear transceiver
strategies that account for limited CSIT, ii) the proposal of
channel quantization techniques and FB strategies that exploit
spatial and time correlation of the MIMO channel and iii) the
derivation of efficient and robust user selection schemes for the
maximization of the achievable throughput. In MIMO downlink
systems the potential gains of multiuser over more conventional
single user transmission strategies are also evaluated in a
multi-cell cellular network where coordination among spatially
distributed base stations and higher order sectorization are
investigated as possible methods to mitigate inter-cell
interference. In case of multiuser MIMO orthogonal frequency
division multiplexing (OFDM) downlink systems we provide non
trivial generalizations of channel quantization strategies
proposed for single carrier flat fading systems. Interestingly,
concentrating FB bits to characterize only a portion of the
available bandwidth at receivers and the possibility of exploiting
multiuser diversity can increase significantly the achievable
throughput.

In NCSs where system measurements come from multiple spatially
distributed sensors, the main contribution is the generalization
of estimation and control techniques to account for wireless link
inefficiencies: i) packet loss, ii) delays and iii) signal
quantization. In particular sensors, controller and actuator share
a common frequency resource motivating a cross layer optimization
of i) signal/measurements quantization processes and ii) network
resource allocation. Even with small transmission bandwidth,
single-hop communication protocols with binary phase shift keying
provide close to optimum performance in applications dealing with
state estimation or state control of a stable system. This support
the widespread use of low-cost sensors for these applications.


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EPrint type:Ph.D. thesis
Tutor:Benvenuto, Nevio
Ph.D. course:Ciclo 21 > Scuole per il 21simo ciclo > INGEGNERIA DELL'INFORMAZIONE > INGEGNERIA ELETTRONICA E DELLE TELECOMUNICAZIONI
Data di deposito della tesi:30 January 2009
Anno di Pubblicazione:01 January 2009
Key Words:Wireless systems, Multiuser MIMO, Networked Control Systems, quantization, limited feedback, estimation, linear quadratic Gaussian control
Settori scientifico-disciplinari MIUR:Area 09 - Ingegneria industriale e dell'informazione > ING-INF/03 Telecomunicazioni
Struttura di riferimento:Dipartimenti > Dipartimento di Ingegneria dell'Informazione
Codice ID:1592
Depositato il:30 Jan 2009
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