SI-MM-OFDM-IM

Introduction

Index modulation (IM) refers to a family of modulation techniques that rely on the activation states of some resources/building blocks for information embedding. The resources/building blocks can be either physical, e.g., antenna, subcarrier, time slot, and frequency carrier, or virtual, e.g., virtual parallel channels, signal constellation, space-time matrix, and antenna activation order. A distinct feature of IM is that part of the information is implicitly embedded into the transmitted signal.

What is in this repo?

In this repo we implement three of the basics IM schemes:

• Single Mode OFDM Index Modulation (SM-OFDM-IM)
• Dual Mode OFDM Index Modulation (DM-OFDM-IM)
• Multiple Mode OFDM Index Modulation (MM-OFDM-IM)

and we propose and implement a novel (IM) scheme, with a much more improved Bit Error Rate (BER) performance, the

• Sub-block Index Multiple Mode OFDM Index Modulation (SI-MM-OFDM-IM).

This repo also contains a recearch paper:

• Obfuscation_of_Index_Modulated_OFDM_Signals.pdf

which contains:

• Model Architecture (Unencrypted/Encrypted)
• BER Performance Evaluation (Unencrypted/Encrypted)
• Modulation Obfuscation Security Evaluation (Unencrypted/Encrypted)
  • Machine Learning - Neural Network

Software Platform

• Octave

Implementation

• Transmitter

• Channel Model

  • Rician Fading Channel
  • Perfect Channel Estimation

• Receiver

  • Detector
    • Viterbi-like Algorithm
    • Better performance than the Optimal ML Detector

SM-OFDM-IM

DM-OFDM-IM

MM-OFDM-IM

SI-MM-OFDM-IM