LLR Reliability Improvement for Multilayer Signals

The limitations and rigidness of current use of spectrum resources have fostered the design of new power multiplexing techniques to improve frequency efficiency and flexibility. These techniques are based on the simultaneous transmission of different services on the same channel with different power...

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Bibliographic Details
Published inIEEE transactions on broadcasting Vol. 63; no. 1; pp. 275 - 281
Main Authors Regueiro, Cristina, Barrueco, Jon, Montalban, Jon, Angueira, Pablo, Ordiales, Juan Luis, Velez, Manuel
Format Journal Article
LanguageEnglish
Published IEEE 01.03.2017
Subjects
AWGN
Decoding
Gain
LDM
LLR
log-likelihood ratio
multilayer
NOMA
Nonhomogeneous media
PDF
Probability density function
Robustness
Signal to noise ratio
simulations
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Summary:The limitations and rigidness of current use of spectrum resources have fostered the design of new power multiplexing techniques to improve frequency efficiency and flexibility. These techniques are based on the simultaneous transmission of different services on the same channel with different power distribution. At the receiver side Log-likelihood ratio (LLR) probability density functions have been so far optimized for single layer systems, so the reception quality of multilayer signals with the existing LLR algorithms is degraded. This paper proposes a new LLR probability density function, including corrections for the multilayer influence, in order to improve reception performance. Simulation results are also included to test the performance improvement in terms of the receiving SNR threshold.
ISSN:0018-9316
1557-9611
DOI:10.1109/TBC.2016.2617280