GTTI 2009: sessione Trasmissione Spectrally efficient LDPC coded modulations
Andrea Marinoni, Thomas A. Courtade, Richard D. Wesel · 2009
In recent times the need of spectral efficiency has become a relevant topic for many communication systems, especially for wireless services. In order to achieve the be st trade- off between bandwidth occupancy and error-rate performance, several structures that involve large constellations have been proposed in literature. This paper focuses on LDPC-coded systems using 16-QAM constellations on a channel affected by Additive White Gaussian Noise (AWGN). The LDPC codes that have been used include both binary and non-binary systems. In order to be compared, they have been designed such that they are equivalent in terms of blocklength, rate and average column weight. Simulation results show how the structure that involves a q-ary LDPC code outperforms the other schemes: new possible scenarios to be analyzed and ongoing works are then introduced. I. I NTRODUCTION