An LTE reconfigurable SOVA/log-MAP turbo decoder for uncorrelated Rayleigh fading

According to published literature for turbo decoding, SOVA and log-MAP algorithms share common operations. This paper shows that the improved reconfigurable SOVA/log-MAP turbo decoder can be implemented in LTE standard for uncorrelated Rayleigh fading channel. We concentrate on physical shared channel and use pipeline turbo decoder architecture with 12 iterations. We examine two data rates and for each one we consider the nine possible QCIs using five frame lengths. Considering BER and delay limitations for each QCI, SOVA is proposed for most of the cases for low data rates (apart from QCIs with tight BER limitation), whereas log-MAP is proposed for higher data rates.