Low peak to average power ratio Turbo Block QPSK coded OFDM

In this work, we propose a QPSK OFDM code that has both low peak to average power ratio and good bit error rate performance. We consider a Time-frequency Turbo Block code. This code is composed of the cosets of the first-order binary Reed-Muller (RM) code in the frequency domain, and Bose-Chaudhuri-Hocquenghem (BCH) code in the time domain. Our contributions are two-fold: 1) we introduce two encoding schemes that guarantee a PAPR of 3 dB for QPSK constellation, 2) we propose moderate complexity decoding procedures for these schemes. We evaluate the performance of the proposed schemes for the additive white Gaussian noise channel. Our code performs only slightly worse than the best known Turbo codes but has significantly lower PAPR. This gives a significant total power gain over the best known Turbo codes.