Improved distance spectrum of asymmetric turbo codes

Abstract EN

In this work, the performance of a class of asymmetric turbo codes, which are composed of mixed types of non-identical, recursive systematic convolutional codes has been investigated.

Internal pilot insertion technique is utilized to further improve the BER performance of turbo code especially at high SNR.

The minimum distance of turbo codes and the multiplicity of low weight codewords can be improved by inserting pilot bits within the sequence of information bits entering the turbo encoder.

This technique was shown to be useful on the symmetric and asymmetric turbo coded signals.