Reduction of PAPR in coded OFDM using fast Reed-Solomon codes over prime Galois fields

ABSTRACT

In this work, two new techniques using Reed–Solomon (RS) codes over GF(257) and GF(65,537) are proposed for peak-to-average power ratio (PAPR) reduction in coded orthogonal frequency division multiplexing (OFDM) systems. The lengths of these codes are well-matched to the length of OFDM frames. Over these fields, the block lengths of codes are powers of two and we fully exploit the radix-2 fast Fourier transform algorithms. Multiplications and additions are simple modulus operations. These codes provide desirable randomness with a small perturbation in information symbols that is essential for generation of different statistically independent candidates. Our simulations show that the PAPR reduction ability of RS codes is the same as that of conventional selected mapping (SLM), but contrary to SLM, we can get error correction capability. Also for the second proposed technique, the transmission of side information is not needed. To the best of our knowledge, this is the first work using RS codes for PAPR reduction in single-input single-output systems.

KEYWORDS:

• OFDM
• PAPR
• SLM
• Reed–Solomon codes

Acknowledgements

The authors would like to express their gratitude to the anonymous reviewers whose constructive points improved the quality of this paper. The authors also would like to thank Mohammad Sadeq Pouladtan for editing the English of the text.

Disclosure statement

No potential conflict of interest was reported by the authors.