Design of an Improved <i>M</i>-Ary DCSK-Aided Protograph-Coded Communication System

Differential chaos shift keying (DCSK) is a promising communication technique in the Internet of Things (IoT) scenario. Among various DCSK schemes, $M$ -ary schemes suit LDPC code especially well dispense with channel state information demodulator. However, traditional decoder does not make full use repeated chaotic signals. To solve this problem, we propose an improved design using novel initial signal estimation (ICSE) algorithm. The each utilized to estimate original signal, hence provide accurate log-likelihood ratio (LLR) and improve error performance. further boost system performance, A protograph proposed extrinsic transfer (P-EXIT) Both analytical simulated results show that both are competitive. protograph-coded our ICSE algorithm solution for low-power low-complexity devices.