Title :
Cutoff rate and constellation design for the companding channel
Author :
Davidson, J. ; Kalet, I.
Author_Institution :
Shiron-Advanced Commun. Ltd., Tel-Aviv, Israel
Abstract :
In modern voiceband data communication the received signal is subject to nonlinear quantization noise due to companding. Under certain conditions this quantization noise may become dominant and cause serious degradation in performance. We first calculate the cutoff rate and then use these results to design new “optimal” signal constellations for the companding channel. These new constellations are computed assuming a signal dependent non-circular Gaussian channel transition density
Keywords :
Gaussian channels; channel capacity; compandors; data communication; probability; quantisation (signal); signal synthesis; companding channel; cutoff rate; noncircular Gaussian channel transition density; nonlinear quantization noise; optimal signal constellation design; performance degradation; probability; voiceband data communication; Additive noise; Constellation diagram; Data communication; Gaussian channels; Gaussian noise; Quadrature amplitude modulation; Quantization; Signal to noise ratio; Telephony; Working environment noise;
Conference_Titel :
Electrical and Electronics Engineers in Israel, 1996., Nineteenth Convention of
Conference_Location :
Jerusalem
Print_ISBN :
0-7803-3330-6
DOI :
10.1109/EEIS.1996.566985
