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The authors investigate the design of Luby Transform (LT) codes with Minimum-Shift-Keying (MSK) modulation over Additive White Gaussian Noise (AWGN) channels. Both systematic and nonsystematic LT codes are considered from the perspectives of decoding threshold and bit error rate. Using systematic LT codes, coding complexity can be reduced by eliminating the need for decoder-doping, and less parity bits are required as compared to the nonsystematic LT codes. In addition, systematic LT codes exhibit better performance than their nonsystematic counterparts for low fixed code rates. To evaluate the performance of the LT coded MSK system, they consider a family of rate-compatible fixed-rate codes, which allows one to use EXtrinsic Information Transfer (EXIT) charts for analysis and design.
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