LDPC code design for fading interference channels

Date
2019-03
Advisor
Instructor
Source Title
IEEE Transactions on Vehicular Technology
Print ISSN
0018-9545
Electronic ISSN
1939-9359
Publisher
IEEE
Volume
68
Issue
3
Pages
2374 - 2385
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
Abstract

We focus on the two-user Gaussian interference channel (IC) with fading and study implementation of different encoding/decoding schemes with low-density parity-check (LDPC) codes for both quasi-static and fast fading scenarios. We adopt Han-Kobayashi encoding, derive stability conditions on the degree distributions of LDPC code ensembles, and obtain explicit and practical code designs. In order to estimate the decoding thresholds, a modified form of the extrinsic information transfer chart analysis based on binary erasure channel approximation for the incoming messages from the component LDPC decoders to state nodes is developed. The proposed code design is employed in several examples for both fast and quasi-static fading cases. Comprehensive set of examples demonstrate that the designed codes perform close to the achievable information theoretic limits. Furthermore, multiple antenna transmissions employing the Alamouti scheme for fading ICs are studied, a special receiver structure is developed, and specific codes are explored. Finally, advantages of the designed codes over point-to-point optimal ones are demonstrated via both asymptotic and finite block length simulations.

Course
Other identifiers
Book Title
Keywords
Low-density parity-check codes, Interference channels, Code design, Iterative joint decoding, Han-Kobayashi encoding
Citation
Published Version (Please cite this version)