Paper Info
Title
MMSE turbo equalisation for real-valued symbols
Abstract
This paper deals with iterative or turbo receivers where the maximum a posteriori detector has been replaced by a widely linearfilter minimising the mean square error, that is the widely linear Wiener Filter (WF). In communication systems where the transmitted symbols can be assumed to be realisations of a non-circular random variable, widely linear processing outperforms the linear one. Besides the non-circularity due to the a priori information fed back in the turbo scheme, we investigate real-valued modulation alphabets which are non-circular even if the a priori information is zero. We derive the widely linear WF for this case and observe that the number of floating point operations involved in its computation, is higher than the one of the linear WR Nevertheless, they have the same order of computational complexity. Moreover, we reveal the relationship between the proposed widely linear equaliser and interference cancellation based on the available a priori information. Simulation results of a frequency-selective turbo system show that despite of the increased computational complexity, the performance gain of widely linear processing compared to the linear one, is negligible. However, in systems without turbo feedback, the widely linear WF outperforms tremendously the linear one. Copyright (c) 2006 AEIT.
Year
DOI
Venue
2006
10.1002/ett.1126
EUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS
Field
DocType
Volume
Turbo,Wiener filter,Linear filter,Equalization (audio),Computer science,Iterative method,Turbo code,Electronic engineering,Equaliser,Computational complexity theory
Journal
17
Issue
ISSN
Citations 
3
1124-318X
1
PageRank 
References 
Authors
0.37
14
2
Name
Order
Citations
PageRank
Guido Dietl112715.21
Wolfgang Utschick21755176.66