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Soft-Output Demapper with Approximated LLR for DVB-T2 Systems
| Publication type | Conference paper |
|---|---|
| Year of publication | 2015 |
| Authors | Giuseppe Baruffa and Luca Rugini |
| Title | Soft-Output Demapper with Approximated LLR for DVB-T2 Systems |
| Conference name | IEEE Globecom 2015 |
| Volume | |
| Issue | |
| Pages | 1–6 |
| Editor | |
| Publisher | IEEE |
| Date | December 2015 |
| Place | San Diego, CA, USA |
| ISSN number | |
| ISBN number | 978-1-4799-5952-5 |
| Key words | DVB-T2, Log-likelihood ratio, LDPC, Multipath, Soft-output demapper |
| Abstract | Bit-interleaved coded modulation (BICM) is at the heart of the second generation digital terrestrial television systems (DVB-T2), which achieves a large spectral efficiency by means of high-order quadrature amplitude modulation (QAM) and low-density parity-check (LDPC) codes. This paper proposes a simple but effective approximation for the log-likelihood ratio (LLR) of the bits estimated by the soft-output QAM demapper. The proposed approximation, which keeps few dominant terms of the LLR expression, needs low additional complexity with respect to the conventional Max-Log approximation. Simulation results for DVB-T2 in multipath channels show a performance gain with respect to the Max-Log approach, especially for QAM with large modulation order. |
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| Paper |  (portable document format, 801519 Bytes) |