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Raptor codes and Rate-Compatible Low-Density Parity-Check (RC-LDPC) codes have drawn much attention in recent years as they can approach channel capacity without requiring channel information at the transmitter. Raptor codes have been shown to uniformly approach the binary-input AWGN channel capacity, especially at low SNR's, whereas RC-LDPC codes have the potential to provide higher throughput than Raptor codes at high SNR's. In this paper, the authors use different message word sizes to compare the throughput of three rateless codes, namely, Raptor codes, Rate-Compatible Irregular Repeat-Accumulate (RC-IRA) codes, and the Rate-Compatible Quasi-Cyclic LDPC (RC/QC-LDPC) codes proposed in the 3GPP2 and 802.20 standards.
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