Practical Codes for Lossy Compression When Side Information May Be Absent
Source: Drexel University
Practical codes are developed for quadratic Gaussian lossy compression when side information may be absent by hybridizing Successively Refinable Trellis Coded Quantization (SR-TCQ) and Low-Density Parity-Check (LDPC) codes. A 2-refinement level SR-TCQ is used to generate a common description for both decoders and an individual description for the decoder with side information. Then, the common description is losslessly compressed while the individual description is compressed using a LDPC code which exploits the side information in a belief propagation decoder. Simulation results show that the practical codes require no more than 0:46 extra bits at moderate rates and no more than 0:7 extra bit at low rates from the theoretical bounds.