Series in Microelectronics
edited by
Wolfgang Fichtner
Qiuting Huang
Heinz Jäckel
Gerhard Tröster
Bernd Witzigmann
Simon Häne,
VLSI Circuits for MIMO-OFDM Physical Layer.
2007, 170 pages. € 64,00. ISBN 3-86628-196-X AND
978-3-86628-196-7
Abstract:
Data rates provided by wireless communication systems have been growing
exponentially in time. Today,
about a decade after the first publications on multiple-input multiple-output
(MIMO) wireless systems, the adoption of multiple antennas at both ends of the
wireless link in practical systems is considered the most promising technique
for breaking the gigabit-per-second barrier. In fact, MIMO provides a linear
increase in channel capacity with the minimum number of transmit or receive
antennas at the cost of increased receiver complexity only, without additional
bandwidth or transmit power expenditure.
When combined with broadband modulation schemes such as orthogonal frequency
division multiplexing (OFDM), MIMO receivers pose signal processing
requirements that call for dedicated very-large scale integration (VLSI)
circuits. Even on state-of-the-art process technologies, however, the
realization of optimal MIMO algorithms is impossible, so that suboptimal
solutions must be adopted.
This thesis focuses on the joint design of reduced-complexity algorithms and
corresponding VLSI architectures for some of the most implementation-critical
signal processing tasks in MIMO-OFDM systems, including channel estimation,
soft-information extraction, and Viterbi decoding. Appropriate algorithm
modifications avoid operations that are ill-suited for VLSI implementation and
reduce the overall operation count to a manageable order of magnitude. The
proposed circuits are prototyped in a real-time testbed for proof of concept
and provide reference figures for the silicon complexity of broadband MIMO
systems. Insight into performance and limitations of real-world MIMO systems is
provided by extensive measurements based on a multipath channel emulator.
About the Author:
Simon Häne was born in Switzerland in 1978. He received the Dipl. Ing.
degree in 2002 from the ETH, Zürich, Switzerland. He joined the Integrated
Systems Laboratory at the ETH as a research assistant, working on the
development of integrated circuits for signal processing in MIMO wireless
communication systems.
Keywords: MIMO-OFDM, WLAN, Channel estimation, Soft-information extraction,
Viterbi decoding, FPGA, Rapid prototyping, VLSI
Series in Microelectronics
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