Series in Microelectronics
edited by
Wolfgang Fichtner
Qiuting Huang
Heinz Jäckel
Gerhard Tröster
Bernd Witzigmann
Christoph
David Perels,
Frame-Based MIMO-OFDM Systems:
Impairment Estimation and Compensation.
2008, 180 pages. € 64,00. ISBN 3-86628-172-2 AND
978-3-86628-172-1
Abstract:
Multi-antenna
systems that use orthogonal frequency division multiplexing (MIMO-OFDM) are
considered to be employed in future wireless local area networks (WLAN). When
implementing such systems covering all aspects from analog signal conditioning
to digital baseband processing, non-idealities appear that deviate considerably
from idealized assumptions often found in literature.
Impairments such as carrier frequency offset, sampling rate offset, or channel
attenuation must be estimated and compensated in order to allow successful
communication at high data rates.
This thesis elaborates on impairments that dominate in frame-based WLAN MIMO-OFDM
systems. Algorithms are reviewed and evaluated, keeping a feasible hardware
implementation in mind. A generally suitable packet detection algorithm for any
frame-based multi-antenna receiver is characterized and implemented. Multiple
parameter estimation and compensation algorithms were implemented in a
FPGA-based real-time MIMO-OFDM testbed. A preamble structure to allow efficient
received signal power estimation is presented and used in the header of MIMO-OFDM
frames.
All implemented algorithms where characterized with regard to complexity in a
real-time FPGA-based testbed. Measurements characterizing the in-system
performance were conducted. The impact on the system data throughput of
individual algorithms shows that the loss incurred by the presence of such
impairments can be mitigated at reasonable costs.
About the Author:
Christoph David Perels was born on April 15th 1972 in Heidelberg,
Germany. He studied electrical engineering at the ETH Zurich from 1992 to 1997
and received his Diploma degree 1997. From 1997 to 2001 he worked at Swisscom
Mobile in the field of mobile communications and mobile data services. In 2001
he joined the Integrated Systems Laboratory at ETH Zurich to work towards his
PhD in the field of MIMO communication systems.
Keywords: MIMO-OFDM, WLAN, Synchronization, Parameter estimation, FPGA, Rapid
prototyping, VLSI
Series in Microelectronics
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