A Joint Soft Sparse Encoding Scheme for Relay System
Qin Zhang, Dengsheng Lin, Gang Wu · 2011
In this paper, we study a joint soft sparse encoding scheme for the three-node relay system. The relayed soft information is expressed basing on the Log- Likelihood-Ratios (LLRs) of the received signals at the relay. We investigate this coding method by using a regular LDPC code at the source and a sparse generator matrix at the relay. We also deliberately design the structure of the joint code by Gaussian approximation. Simulation results demonstrate that the system which uses the proposed coding scheme can obtain a considerable gain over the traditional hard encoding scheme.