LDPC codes for fading Gaussian broadcast channels

In this work, we study coding over a class of two-user broadcast channels (BCs) with additive white Gaussian noise and multiplicative fading known at the receivers only. Joint decoding of low-density parity-check (LDPC) codes is analyzed. The message update rule at the mapping node linking the users...

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Bibliographic Details
Published in:IEEE transactions on information theory 2005-06, Vol.51 (6), p.2173-2182
Main Authors: Berlin, P., Tuninetti, D.
Format: Article
Language:English
Subjects:
Additive white noise
Algorithms
Applied sciences
Boundaries
Broadcast channels (BCs)
Broadcasting
Channels
Codes
Coding
Coding, codes
Communication channels
Constraint optimization
Decoding
Detection, estimation, filtering, equalization, prediction
Exact sciences and technology
extrinsic information transfer (EXIT) charts
Fading
fading channels
Gaussian
Information analysis
Information theory
Information, signal and communications theory
Interference cancellation
Joining processes
low-density parity-check (LDPC) codes
Noise levels
Normal distribution
Parity check codes
Performance analysis
Signal and communications theory
Signal, noise
sum-product algorithm
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
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Summary:In this work, we study coding over a class of two-user broadcast channels (BCs) with additive white Gaussian noise and multiplicative fading known at the receivers only. Joint decoding of low-density parity-check (LDPC) codes is analyzed. The message update rule at the mapping node linking the users' codes is derived and is found to exhibit an interesting soft interference cancellation property. High performance codes are found using the differential evolution optimization technique and extrinsic information transfer analysis adapted to our multiuser setting. The optimized codes have rates very close to the boundary of the achievable region for binary constrained input for both faded and unfaded channels. Simulation results for moderate block lengths show that our codes operate within less than 1 dB of their respective threshold.
ISSN:0018-9448
1557-9654
DOI:10.1109/TIT.2005.847752