Evaluation of low complexity concatenated codes for high data rate transmission

In this paper we compare low complexity turbo-like codes formed by differential encoders. A unified coding scheme combining turbo codes and parallel concatenated zigzag codes (PCZZ) and its multi-dimensional extension for packet re-transmission schemes in HSDPA/WCDMA is proposed. It is shown that low complexity PCZZ outperforms WCDMA turbo codes at high coding rates. Modified zigzag decoder and suggested simple stopping rule for PCZZ iterative decoding brings further complexity reduction without visible performance loss.