Title :
A rate-maximizing channel-shortening detector with soft feedback side information
Author :
Rusek, Fredrik ; Al-Dhahir, Naofal ; Gomaa, Ahmad
Author_Institution :
Dept. of Electr. & Inf. Technol., Lund Univ., Lund, Sweden
Abstract :
In this paper, we present a novel approach for the design of rate-maximizing channel shortening detectors with soft feedback side information for frequency-selective channels. The detector is a soft-input soft-output detector and constitutes one of the components of an iterative receiver. The design optimization is performed from an information-theoretic perspective where we maximize the achievable rate during each step of the iterative process. Our proposed detector consists of a front-end filter whose coefficients are given in closed form in addition to a convex optimization procedure which provides the branch labels of the trellis and the feedback filter coefficients. The detector can be implemented as a BCJR-type algorithm operating on a trellis where the number of states is a user-defined parameter.
Keywords :
convex programming; intersymbol interference; iterative methods; trellis codes; BCJR-type algorithm; convex optimization; feedback filter coefficient; frequency-selective channel; front-end filter; information-theoretic perspective; intersymbol interference; iterative receiver; rate-maximizing channel shortening detector design; soft feedback side information; soft-input soft-output detector; trellis; BCJR Algorithm; Channel Shortening; Equalization; Information Rate; Intersymbol Interference; Reduced-Complexity Detection;
Conference_Titel :
Global Communications Conference (GLOBECOM), 2012 IEEE
Conference_Location :
Anaheim, CA
Print_ISBN :
978-1-4673-0920-2
Electronic_ISBN :
1930-529X
DOI :
10.1109/GLOCOM.2012.6503451