Spatially-Coupled Precoded Rateless Codes with Bounded Degree Achieve   the Capacity of BEC under BP decoding
  Raptor codes are known as precoded rateless codes that achieve the capacity of BEC. However the maximum degree of Raptor codes needs to be unbounded to achieve the capacity. In this paper, we prove that spatially-coupled precoded rateless codes achieve the capacity with bounded degree under BP decoding. 
Kosuke Sakata, Kenta Kasai and Kohichi Sakaniwa
cs.IT math.IT