Annotated Raptor Codes
  In this paper, an extension of raptor codes is introduced which keeps all the desirable properties of raptor codes, including the linear complexity of encoding and decoding per information bit, unchanged. The new design, however, improves the performance in terms of the reception rate. Our simulations show a 10% reduction in the needed overhead at the benchmark block length of 64,520 bits and with the same complexity per information bit. 
Kaveh Mahdaviani, Masoud Ardakani, Chintha Tellambura
cs.IT math.IT