Performance improvement techniques for CCK-OFDM WLAN modem

We propose a new scheme using the 1st order Reed-Muller (RM) code with variables 4, RM(1, 4), which improves the performance of IEEE 802.11g wireless local area network (WLAN) modems in terms of peak-to-average power ratio (PAPR) and symbol error probability (SER). We show the equivalence between the complementary code keying (CCK) codeword and the coset of the 1st order Reed-Muller code with variables 3, RM(1, 3). This proposed system shows better performance than CCK in terms of PAPR and SER. When the number of IFFT points is 64, we reduce PAPR by 9dB and get a coding gain of 3dB at symbol error probability of 10/sup -4/. Since the system of RM(1, 4) can be implemented using the RM(1, 3), there is a little increase in complexity.