A New Wireless Access Scheme: Novel Punctured LDPC Coded Ultra-wideband System

Ultra-wideband (UWB) technology has attracted much attention in high speed indoor wireless communications. UWB communications have transmitted power limitations according to FCC regulation. To face this drawback, while still maintaining significant error correction capabilities, we propose a novel punctured low-density parity-check (LDPC) coding scheme for multiband OFDM (orthogonal frequency division multiplexing) UWB systems in this paper. Different from the randomly punctured coding, we puncture the variable nodes on their degrees. We fix the target SNR threshold of the punctured code and optimize (maximize) the puncturing fraction for that threshold. From our analysis and numerical results, we find that this new scheme gives a significant performance gain compared with the randomly punctured scheme.