  In this paper, we presented three approaches to improve the design of Kite
codes (newly proposed rateless codes), resulting in an ensemble of
rate-compatible
  LDPC codes with code rates varying "continuously" from 0.1 to 0.9 for
additive white Gaussian noise (AWGN) channels. The new ensemble rate-compatible
LDPC codes can be constructed conveniently with an empirical formula.
Simulation results show that, when applied to incremental redundancy hybrid
automatic repeat request (IR-HARQ) system, the constructed codes (with higher
order modulation) perform well in a wide range of signal-to-noise-ratios
(SNRs).
