COMBINED POWER LOADING AND PAPR REDUCTION FOR OFDM WITH ERASURE DECODER

摘要

System and method for combining equal Signal to Noise Ratio (SNR) Power-Loading (PL) with Hard Decision Erase (HDE) decoder in Orthogonal Frequency-Division Multiplexing (OFDM) using Bit-Interleaved Coded Modulation (BICM) communication system. An SNR threshold is calculated such that BER in the receiver is substantially minimized. Zero power level is assigned to sub-carriers having SNR before PL that is lower than SNR threshold, and a power level is assigned to other sub-carriers, such that SNR after PL seen at the receiver is substantially equal across the sub-carriers to which a non-zero power level was assigned. The HDE decoder at the receiver erases the bits with substantially zero energy level. Additionally, TR based PAPR reduction is combined with the equal SNR PL and HDE decoder. In the later case, sub-carriers having SNR before PL that is lower than SNR threshold are used as reserved tones.