Invertible subset LDPC codes for PAPR reduction in OFDM-WLAN systems

A new type of low density parity-check (LDPC) codes, called as invertible subset LDPC (IS-LDPC) codes, was proposed to reduce the peak-to-average power ratio (PAPR) for orthogonal frequency-division multiplexing (OFDM) systems with low complexity recently. In this paper, we apply IS-LDPC codes to OFDM-wireless local area networks (OFDM-WLAN) systems and design parameters of IS-LDPC codes to satisfy requirements of the IEEE 802.11 OFDM-WLAN system. Moreover, we propose interleaved subset mapping scheme to guarantee the frequency diversity gain. The simulation results show that the IS-LDPC codes for the IEEE 802.11 OFDM-WLAN system exhibit good error-correcting performance and significantly reduce the PAPR. With all mentioned advantages, the PAPR reduction scheme based on IS-LDPC codes could serve as an attractive PAPR reduction solution for the IEEE 802.11 OFDM-WLAN systems.