Title :
A new SISO algorithm with application to turbo equalization
Author :
Sikora, Marcin ; Costello, Daniel J., Jr.
Author_Institution :
Dept. of Electr. Eng., Notre Dame Univ., IN
Abstract :
In this paper we propose a new soft-input soft-output equalization algorithm, offering very good performance/complexity tradeoffs. It follows the structure of the BCJR algorithm, but dynamically constructs a simplified trellis during the forward recursion. In each trellis section, only the M states with the strongest forward metric are preserved, similar to the M-BCJR algorithm. Unlike the M-BCJR, however, the remaining states are not deleted, but rather merged into the surviving states. The new algorithm compares favorably with the reduced-state BCJR algorithm, offering better performance and more flexibility, particularly for systems with higher order modulations
Keywords :
equalisers; trellis codes; turbo codes; M-BCJR algorithm; SISO algorithm; forward metric; forward recursion; higher order modulations; performance-complexity tradeoffs; reduced-state BCJR algorithm; simplified trellis; soft-input soft-output equalization algorithm; trellis section; turbo equalization; Bit rate; Convolutional codes; Costs; Demodulation; Equalizers; Heuristic algorithms; Intersymbol interference; Iterative algorithms; Iterative decoding; Noise figure;
Conference_Titel :
Information Theory, 2005. ISIT 2005. Proceedings. International Symposium on
Conference_Location :
Adelaide, SA
Print_ISBN :
0-7803-9151-9
DOI :
10.1109/ISIT.2005.1523702