Title :
Nonsystematic turbo codes: Design and bounds on effective free distance
Author :
Vatta, Francesca ; Amat, Alexandre Graell I ; Banerjee, Adrish ; Costello, Daniel J., Jr.
Author_Institution :
DEEI, Univ. di Trieste, Trieste
Abstract :
In this paper, we address the design of turbo codes employing nonsystematic constituent encoders. Nonsystematic encoders have superior effective free distances compared to equivalent systematic encoders of the same complexity, and hence they are capable of achieving lower error floors. We derive bounds on the effective free distance of turbo codes employing nonsystematic constituent encoders and compare their distance and convergence properties with systematic turbo codes.
Keywords :
convergence; turbo codes; convergence properties; free distance; nonsystematic constituent encoders; nonsystematic turbo codes; systematic turbo codes; Convergence; Convolutional codes; Delay; Information theory; NASA; Output feedback; Shift registers; Telecommunications; Turbo codes; Upper bound;
Conference_Titel :
Information Theory and Its Applications, 2008. ISITA 2008. International Symposium on
Conference_Location :
Auckland
Print_ISBN :
978-1-4244-2068-1
Electronic_ISBN :
978-1-4244-2069-8
DOI :
10.1109/ISITA.2008.4895621
