Name
Title | ||
|---|---|---|
EXIT Chart Based System Design for Iterative Source-Channel Decoding with Fixed-Length Codes |
Abstract | ||
|---|---|---|
Audio-visual source encoders for digital wireless communications extract parameter sets on a frame-by-frame basis. Due to delay and complexity constraints these parameters exhibit some residual redundancy which manifests itself in non-uniform parameter distributions and intra- as well as inter-frame correlation. This residual redundancy can be exploited by iterative source-channel decoding (ISCD) to improve the robustness against impairments from the channel. In the design process of ISCD systems the well known EXIT charts play a key role. However, in case of inter-frame parameter correlation, the classic EXIT charts do not provide reliable bounds for predicting the convergence behavior of ISCD. We explain the reasons for the so-called overshooting effect and propose a novel extension to the EXIT chart computation which provide significantly better bounds for the decoding trajectories. Four advanced ISCD system configurations are proposed and investigated using the benefits of the improved EXIT chart based system design. These configurations include regular and irregular redundant index assignments. In addition, we incorporate unequal error protection in the optimization of irregular index assignments. We show how to realize a versatile multi-mode ISCD scheme which operates close to the theoretical limit. |
Year | DOI | Venue |
|---|---|---|
2011 | 10.1109/TCOMM.2011.062311.090019 | IEEE Transactions on Communications |
Keywords | Field | DocType |
combined source-channel coding,iterative decoding,radiocommunication,EXIT chart based system design,audiovisual source encoders,complexity constraints,convergence behavior,decoding trajectories,delay constraints,digital wireless communications,fixed-length codes,interframe parameter correlation,intraframe correlation,irregular redundant index assignments,iterative source-channel decoding,nonuniform parameter distributions,overshooting effect,regular redundant index assignments,residual redundancy,unequal error protection,versatile multimode ISCD scheme,EXIT chart,Iterative source-channel decoding (ISCD),soft decision source decoding (SDSD),turbo principle | Convergence (routing),EXIT chart,Control theory,Computer science,Communication channel,Systems design,Electronic engineering,Robustness (computer science),Redundancy (engineering),Encoder,Decoding methods | Journal |
Volume | Issue | ISSN |
59 | 9 | 0090-6778 |
Citations | PageRank | References |
7 | 0.51 | 28 |
Authors | ||
4 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Schmalen, Laurent | 1 | 112 | 32.50 |
| Marc Adrat | 2 | 170 | 16.64 |
| Thorsten Clevorn | 3 | 45 | 6.05 |
| Peter Vary | 4 | 852 | 75.52 |