Title :
Optimizing signal constellations for the output of a quantizer
Author :
Perkins, Michael G.
Author_Institution :
German Aerospace Res. Establ., Oberpfaffenhofen, West Germany
Abstract :
A technique is presented for optimizing signal constellations for the output of a quantizer. The quantizer outputs are assumed to occur with unequal probabilities, and the mean-square error introduced by the channel is used as the performance criterion. A memoryless Gaussian channel and a peak power constraint are assumed. Transmitter power gains of 1 dB-2 dB were demonstrated when the technique was used to optimize signal constellations for the output of a DPCM (differential pulse code modulation) image coder
Keywords :
analogue-digital conversion; encoding; picture processing; pulse-code modulation; 1 to 2 dB; DPCM; differential pulse code modulation; image coder; mean-square error; memoryless Gaussian channel; output; peak power constraint; picture processing; quantizer; signal constellations; transmitter power gains; Constellation diagram; Decoding; Digital modulation; Frequency; Gaussian channels; Lattices; Quantization; Random variables; Speech coding; Upper bound;
Conference_Titel :
Global Telecommunications Conference and Exhibition 'Communications Technology for the 1990s and Beyond' (GLOBECOM), 1989. IEEE
Conference_Location :
Dallas, TX
DOI :
10.1109/GLOCOM.1989.64267
