Huleihel, WasimGoldfeld, ZivKoch, Tobias MircoMadiman, MokshayMédard, MurielHuleihel, Wasim2018-10-032018-10-032018-08-16IEEE International Symposium on Information Theory (ISIT 2018), 17-22 June 2018, Vail, Colorado, USA. [Proceedings], 5 p.978-1-5386-4780-62157-8117https://hdl.handle.net/10016/27521Proceeding of: IEEE International Symposium on Information Theory (ISIT 2018)The capacity-achieving input distribution of the complex Gaussian channel with both average- and peak-power constraint is known to have a discrete amplitude and a continuous, uniformly-distributed, phase. Practical considerations, however, render the continuous phase inapplicable. This work studies the backoff from capacity induced by discretizing the phase of the input signal. A sufficient condition on the total number of quantization points that guarantees an arbitrarily small backoff is derived, and constellations that attain this guaranteed performance are proposed.5application/pdfeng© 2018 IEEE.Discrete constellationsPeak-power-limited complex Gaussian channelsCapacity-achieving input distributionDiscrete amplitudeconference paperElectrónicaTelecomunicacionesopen access15IEEE International Symposium on Information Theory (ISIT 2018) [Proceedings]CC/0000027947