Title :
Time-varying turbo codes
Author :
Jiang, Fan ; Becker, Matthew R. ; Pérez, Lance C.
Author_Institution :
Dept. of Electr. Eng., Univ. of Nebraska, Lincoln, NE, USA
Abstract :
Turbo codes typically utilize time-invariant component codes whose total encoder memory is no greater than 4. In this letter, turbo codes with time-varying component codes are studied via EXIT analysis, distance spectrum analysis and simulation. Turbo codes with time-varying component codes and memory 6 are shown to have similar performance in the waterfall region and superior performance in the error floor region when compared to both the original memory 4 Berrou turbo code and the memory 8 big numerator-little denominator turbo codes.
Keywords :
convolutional codes; error statistics; iterative decoding; spectral analysis; statistical analysis; turbo codes; EXIT analysis; convolutional codes; distance spectrum analysis; encoder memory; extrinsic information transfer; iterative decoding; time-invariant component code; turbo codes; Algorithm design and analysis; Analytical models; Bit error rate; Convolutional codes; Information analysis; Iterative algorithms; Iterative decoding; Iterative methods; Statistical analysis; Turbo codes; EXIT; Extrinsic information transfer; analysis; iterative decoding; time-varying convolutional codes; turbo codes;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2004.833828
