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A study of precoding schemes for ofdm systems
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index.pdf
Date
2008
Author
Çakar, F. Selcen
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We examine the effect of precoding on OFDM systems. The precoding operation, which is also known as constellation rotation, leads to a gain in diversity order for fading channels. In this thesis, we examine the effect of precoding for different receivers such as Maximum Likelihood (ML), Minimum Mean Squared Error (MMSE), and Zero Forcing (ZF) receivers. The diversity gain due to precoding comes at no cost of bandwidth expansion or power increase. Therefore it is an attractive and practical alternative. We also examine the precoding gain, when some reduction of rate is tolerable and compare the performance of rate reduced system with the uncoded system with the system which is coded by rateless unitary precoders, and with the hard-decision decoded BCH coded coded system.
Subject Keywords
Electrical engineering.
,
Diversity.
,
Optimal Control.
URI
http://etd.lib.metu.edu.tr/upload/12609916/index.pdf
https://hdl.handle.net/11511/17984
Collections
Graduate School of Natural and Applied Sciences, Thesis