Design of multi-edge-type bilayer-expurgated LDPC codes for decode-and-forward in relay channels
We consider the design of bilayer-expurgated low- density parity-check (BE-LDPC) codes as part of a decode- and-forward protocol for use over the full-duplex relay chan- nel. A new ensemble of codes, termed multi-edge-type bilayer- expurgated LDPC (MET-BE-LDPC) codes, is introduced where the BE-LDPC...
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| Main Authors: | , , , |
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| Format: | Article |
| Published: |
Institute of Electrical and Electronics Engineers
2011
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| Subjects: | |
| Online Access: | http://eprints.utm.my/id/eprint/44836/ |
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| Summary: | We consider the design of bilayer-expurgated low- density parity-check (BE-LDPC) codes as part of a decode- and-forward protocol for use over the full-duplex relay chan- nel. A new ensemble of codes, termed multi-edge-type bilayer- expurgated LDPC (MET-BE-LDPC) codes, is introduced where the BE-LDPC code design problem is transformed into the problem of optimizing the multinomials of a multi-edge-type LDPC code. We propose two design strategies for optimizing MET-BE-LDPC codes; the bilayer approach is preferred when the difference in SNR between the source-to-relay and the source- to-destination channels is small, while the bilayer approach with intermediate rates is preferred when this difference is large. In both proposed design strategies multi-edge-type density evolution is used for code optimization. The resulting MET-BE-LDPC codes exhibit improved threshold and bit-error-rate performance as compared to previously reported bilayer LDPC codes. |
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