Fig. 6

Quantization and decision patterns based on the genuine user and impostor PDFs. Ideally the genuine user PDF should be contained in the authentic zone and the impostor PDF should have a large mass outside the authentic zone. Fifty percent probability mass is contained in the genuine user and impostor PDF ellipse and circle. The genuine user PDF is based on a 10 dB SNR. a Fixed equiprobable quantization (FQ). b Likelihood classification (LC). c Zero leakage quantization scheme with likelihood based reproduction (ZLQ-LR)