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MIMO OFDM for Wireless LANs

MIMO OFDM for Wireless LANs


ter verkrijging van de graad van doctor aan de
Technische Universiteit Eindhoven, op gezag van de
Rector Magnificus, prof.dr. R.A. van Santen, voor een
commissie aangewezen door het College voor
Promoties in het openbaar te verdedigen
op woensdag 14 april 2004 om 16.00 uur


Albert van Zelst

Geboren te Waalwijk

Dit proefschrift is goedgekeurd door de promotoren:
prof.dr.ir. G. Brussaard
prof.dr.ir. L.P. Ligthart
dr.ir. P.F.M. Smulders

aan Jessica
aan onze ouders


Broadband applications – such as high-speed computer networks, in-home delivery of
multimedia services, or hospital data networks for telediagnostics involving digital
imaging – and the demand for flexibility drive the need for broadband wireless
communication systems. Since the available frequency spectrum is scarce, future systems
should be characterised by significantly enhanced spectral efficiency in order to increase
link throughput and network capacity. A very promising approach is to use multiple
antennas at both the transmitter and the receiver (i.e., a Multiple-Input Multiple-Output
(MIMO) system). With such a system the throughput can be increased by simultaneously
transmitting different streams of data on the different transmit antennas but at the same
carrier frequency. Although these parallel data streams are mixed up in the air, they can be
recovered at the receiver by using spatial sampling (i.e., multiple receive antennas) and
corresponding signal-processing algorithms, provided that the MIMO channel is well
conditioned. This is in general the case in rich-scattering environments, e.g., indoor
environments. Above technique is referred to as Space Division Multiplexing (SDM).
The combination of the throughput enhancement of SDM with the robustness of
Orthogonal Frequency Division Multiplexing (OFDM) against frequency-selective fading
caused by severe multipath scattering and narrowband interference is regarded as a very
promising basis for future (indoor) high data-rate radio communication systems. SDM
OFDM is the focus of this dissertation and its main contents and contributions, in the
natural order from fundamental understanding, theoretical analysis to practical
measurements, are as follows.
1. By means of a physical interpretation, a fundamental and intuitive explanation is given
of the spectral efficiency and stability of a wireless MIMO system in rich-scattering
MIMO OFDM for Wireless LANs
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