NDLI: LDPC Codes for Network-Coded Bidirectional Relaying With Higher Order Modulation

Content Provider	IEEE Xplore Digital Library
Author	Ravindran, K. Thangaraj, A. Bhashyam, S.
Copyright Year	1972
Abstract	We study the use of Low-Density Parity-Check (LDPC) codes for two-phase, network-coded bidirectional relaying with higher-order modulation. In the multiple-access phase, the sum of transmitted symbols scaled by the channel gains is the received relay constellation, which is network-mapped (clustered) to a transmit constellation for the ensuing broadcast phase. This operation at the relay is termed Clustered-Scaled-Sum (CSS) decoding. We propose a CSS coding scheme for bidirectional relaying using a single LDPC code over a ring with higher-order PAM or QAM alphabets. We design a message-passing decoder for CSS decoding with trade-offs possible between complexity and performance. We suggest a method for completing a Constrained Partially-filled Latin Square (CPLS) to a latin square, which is used in the construction of network maps at the relay for any channel fading state. The performance of the CSS coding scheme with LDPC codes over rings is shown to be very close to information-theoretic outer bounds.
Starting Page	1975
Ending Page	1987
Page Count	13
File Size	953728
File Format	PDF
ISSN	00906778
Volume Number	63
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Decoding Relays Parity check codes Cascading style sheets Encoding Frequency modulation multiuser channels Channel coding
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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