Channel Shortening Equalizers for UWB Rake Receivers

UWB systems occupy large bandwidths with very low
power spectral densities. This feature makes UWB
channels highly rich in multipaths. To exploit the
temporal diversity, a UWB receiver usually
incorporates Rake reception. Each multipath in the
channel carries just a fraction of the signal
energy. This phenomenon dictates a Rake receiver
with a large number of fingers to achieve a good
performance. Eventually, the Rake structure becomes
very complex from analysis and design perspectives
and expensive too. This book proposes channel
shortening or time domain equalization as a
technique to reduce the complexity of the UWB Rake
receiver. It begins with the definition of channel
shortening and provides a summary of the existing
channel shortening equalizer (CSE) designs and their
limitations. Consequently, this book presents
several CSE designs to reduce the UWB Rake receiver
complexity. A detalied performance analysis of the
proposed designs indicates that the CSEs can play a
significant role in designing a simple and cost
effective Rake receiver for UWB systems. This book
should be useful to the research students exploring
new CSE designs and applications.

Autorentext

Dr. Imtiaz H. Syed received a bachelor of electrical engineering degree from N.E.D. University, Pakistan, in 1998, master and Ph.D. degrees, from University of New South Wales, Australia, in 2001 and 2008, respectively, where he is currently a research fellow. His research interests include UWB, relay networks and equalization techniques.

Klappentext

UWB systems occupy large bandwidths with very lowpower spectral densities. This feature makes UWBchannels highly rich in multipaths. To exploit thetemporal diversity, a UWB receiver usuallyincorporates Rake reception. Each multipath in thechannel carries just a fraction of the signalenergy. This phenomenon dictates a Rake receiverwith a large number of fingers to achieve a goodperformance. Eventually, the Rake structure becomesvery complex from analysis and design perspectivesand expensive too. This book proposes channel shortening or time domain equalization as atechnique to reduce the complexity of the UWB Rakereceiver. It begins with the definition of channelshortening and provides a summary of the existingchannel shortening equalizer (CSE) designs and their limitations. Consequently, this book presentsseveral CSE designs to reduce the UWB Rake receivercomplexity. A detalied performance analysis of theproposed designs indicates that the CSEs can play asignificant role in designing a simple and costeffective Rake receiver for UWB systems. This bookshould be useful to the research students exploringnew CSE designs and applications.