Title :
Run-length Limited Codes with Free Distance Properties: Construction and Soft-Decision Decoding
Author :
Tiwari, H. ; Thangaraj, A.
Author_Institution :
IITMadras, Chennai
Abstract :
In this work, we have constructed RLL codes that can be used effectively with an outer LDPC code in the standard concatenation configuration. The main idea in the construction is the use of a two-state trellis representation for the sequences satisfying a (d, k) constraint. The constructed RLL codes have a free distance of 2 on this two-state trellis. This enables the use of a low-complexity, 2-state BCJR algorithm for soft-decoding the RLL codes in an iterative decoder. The method can be generalized to construct codes for other constraints as well.
Keywords :
concatenated codes; error correction codes; iterative decoding; parity check codes; runlength codes; trellis codes; BCJR algorithm; LDPC code; error-correcting code; iterative decoder; run-length limited codes; soft-decision decoding; standard concatenation; two-state trellis; AWGN channels; Bit error rate; Code standards; Error correction codes; Interference constraints; Intersymbol interference; Iterative decoding; Memory; Parity check codes; Turbo codes;
Conference_Titel :
Magnetics Conference, 2006. INTERMAG 2006. IEEE International
Conference_Location :
San Diego, CA
Print_ISBN :
1-4244-1479-2
DOI :
10.1109/INTMAG.2006.376513
