Soft Information Extraction for 16QAM and 64QAM Modulation Schemes

This technical documentation describes a software package consisting of 4 MATLAB (.m) files designed for extracting soft information from 16QAM and 64QAM modulated signals. The implementation utilizes advanced demodulation algorithms to compute log-likelihood ratios (LLRs) for each transmitted bit, significantly enhancing communication system performance. Key functions include constellation point mapping, Euclidean distance calculations, and bit-wise reliability metric computation. The software enables users to efficiently and accurately extract modulation information, thereby improving communication efficiency and signal quality through enhanced soft-decision decoding capabilities. Additional features include analytical tools for processing and evaluating the extracted information, facilitating optimized data transmission and subsequent processing operations. The implementation employs optimal detection algorithms that calculate the probability ratios for each bit position based on received signal points relative to the constellation diagram. This approach provides substantial performance gains in forward error correction systems compared to hard-decision decoding methods. Overall, this package serves as a practical and high-performance tool that delivers superior results in digital communications and signal processing applications.