Avoiding Effects of OFDM Adjacent Channel Interference by Using Combinations of Modulation Schemes

Table of Contents

• Abstract
• Introduction
• OFDM adjacent channel interference
• Conventional Methods
  • Windowing
  • Filtering
  • Guard-band and virtual sub-carrier
  • Forward Error Correction coding
  • Adaptive modulation
• Combinations of modulation schemes
  • Performance of OFDM modulation schemes
  • Proposal
  • Simulation model and results
    • Simulations of the proposed method
    • Optimization
• Conclusion
• Acknowledgments
• References

Objectives and Key Themes

This work aims to investigate and propose a method to mitigate the effects of adjacent channel interference (ACI) in Orthogonal Frequency-Division Multiplexing (OFDM) systems. The study explores various conventional ACI mitigation techniques and introduces a novel approach using combinations of modulation schemes.

• Adjacent Channel Interference (ACI) in OFDM systems
• Performance analysis of different OFDM modulation schemes (BPSK, QPSK, 16QAM, 64QAM)
• Development and evaluation of a novel ACI mitigation method using modulation scheme combinations
• Simulation and optimization of the proposed method
• Comparison of the proposed method with conventional ACI mitigation techniques

Chapter Summaries

The introduction sets the context for the research on adjacent channel interference in OFDM systems. Chapter 2 details the nature of OFDM adjacent channel interference. Chapter 3 reviews conventional methods for mitigating this interference, including windowing, filtering, guard bands, error correction, and adaptive modulation. Chapter 4 presents the core of the research, introducing a novel approach utilizing combinations of modulation schemes to combat ACI. This chapter includes performance evaluations and simulations of the proposed method, along with optimization strategies. Note that the conclusion and results are not included in this preview.

Keywords

OFDM, adjacent channel interference, modulation schemes (BPSK, QPSK, 16QAM, 64QAM), error correction, adaptive modulation, simulation, mitigation techniques.