Advances in Visual Data Compression and Communication

i

i

i

i

i

i

i

i

14.3 Compressive Modulation 305

14.3.3 Design RP Codes

An RP code is a linear rateless code which encodes binary digits into multilevel

symbols. It can be represented by a bipartite graph, where left nodes are binary input

and right nodes are encoded multilevel symbols. Every right node has the same fixed

node degree L and the weights of connecting edges are taken from the same set

{w

1

,w

2

,.. . ,w

L

}. The key design parameters for a RP code are the right node degree

L and the set of edge weights.

As the pursuit for RP code arises from the modulation problem, the design objec-

tive naturally is to find a low-complexity code whose output symbols