Research Article
Signal shaping scheme based on the BWT for the transmission of non-binary sources with memory over the AWGN channel
@INPROCEEDINGS{10.4108/chinacom.2010.114, author={Pedro M. Crespo and Xabier Insausti and Javier Del Ser and Jes\^{u}s Guti\^{e}rrez-Guti\^{e}rrez}, title={Signal shaping scheme based on the BWT for the transmission of non-binary sources with memory over the AWGN channel}, proceedings={5th International ICST Conference on Communications and Networking in China}, publisher={IEEE}, proceedings_a={CHINACOM}, year={2011}, month={1}, keywords={Burrows-Wheeler Transform Kullback-Leibler Divergence Shaping Gain Constellation Design}, doi={10.4108/chinacom.2010.114} }- Pedro M. Crespo
Xabier Insausti
Javier Del Ser
Jesús Gutiérrez-Gutiérrez
Year: 2011
Signal shaping scheme based on the BWT for the transmission of non-binary sources with memory over the AWGN channel
CHINACOM
ICST
DOI: 10.4108/chinacom.2010.114
Abstract
This paper proposes a low-complexity signal shaping scheme for the transmission of non-binary symbols generated by sources with memory over the AWGN channel. It is based on using the Burrows-Wheeler Transform (BWT) [1] and standard two dimensional (QAM) constellations. The constellation points are driven based on the first order probabilities of the BWT output symbols so that shaping gain is maximized. The proposed system is an extension of the one introduced in [2] for binary sources. To evaluate its performance, the corresponding average energy per transmitted symbol is compared with that obtained when using an ideal source encoder followed by a standard uncoded QAM transmission scheme. In addition, it is shown that the power gain ratio between both systems can be assessed based on the Kullback-Leibler divergence between the first order probability distributions of the BWT output symbols and the Maxwell-Boltzmann probability distribution, obtained under the constraint of achieving an entropy equal to the entropy-rate of the original source.