A Mismatched Joint Source-Channel Coding Perspective of Probabilistic Amplitude Shaping: Achievable Rates and Error Exponents

02/16/2018
by   Rana Ali Amjad, et al.
0

Probabilistic Amplitude Shaping (PAS) is a novel method of reliable commmunication over channels with non-uniform capacity achieving input distribution. The encoder of PAS is a concatenation of a distribution matcher with systematic encoding of a Forward Error Correction (FEC) code whereas the PAS decoder is a concatenation of a mismatched FEC decoder and dematcher. In recent works PAS has been shown to close the shaping gap to Shannon capacity for discrete input AWGN channel for a wide range of SNR values. In this paper we modify the classical joint source-channel coding setup to include the salient features of PAS and we derive the Gallager style error exponent and consequently achievable rates for this setup.

READ FULL TEXT

Please sign up or login with your details

Forgot password? Click here to reset