A CCK-OFDM Modem Having Low Peak-to-Average Power Ratio

Abstract

In [1], we showed the equivalence between complementary code keying (CCK) codeword and coset of the first order Reed-Muller (RM) code with variables of three. The CCK codewords are Golay sequences which have peak -to-average power ratio (PAPR) of 3dB at most and can correct one error. We proposed a CCK-OFDM modem to reduce PAPR of orthogonal frequency division multiplexing (OFDM) as shown Figure 1. Also, we present the performance improvement techniques by increasing the variables of four to correct three errors and reduce PAPR at least 9dB with this system. In [1], the system used two Fast Hadamard Transform (FHT) blocks of size 8 ? 64 in the receiver. In this paper, we reduce the complexity of the receiver by using FHT blocks of size 8 ? 64 and 2 ? 4 without deteriorating the performance. We generalize our results that we increase the variables of RM code to enhance the error corrcting and PAPR reduction capabilities without increasing receiver’s complexity.