Title :
Weight distributions of turbo-codes
Author_Institution :
Tech. Univ. of Munich, Germany
Abstract :
An optimal interleaving between two component encoders of a turbo-code is proposed. For any real constructable interleaver the optimality criterion is given. For component codes (CC) with known weight distribution (WD) the WD of the turbo-code with perfect interleaving is calculated. As CC´s the random codes and terminated convolutional codes are considered. It is shown that the often observed “break” in the performance curves for turbo-codes is a result of their “broken” WD
Keywords :
concatenated codes; convolutional codes; interleaved codes; component codes; component encoders; optimal interleaving; optimality criterion; performance curves; random codes; terminated convolutional codes; turbo-codes; weight distributions; Block codes; Convolution; Convolutional codes; Equations; Hamming weight; Informatics; Interleaved codes; Linearity; Random variables; Turbo codes;
Conference_Titel :
Information Theory, 1995. Proceedings., 1995 IEEE International Symposium on
Conference_Location :
Whistler, BC
Print_ISBN :
0-7803-2453-6
DOI :
10.1109/ISIT.1995.531140
