The Orthogonal Frequency Division Multiplexing (OFDM) is an important aspect of multicarrier digital data transmission system where a single data stream is transmitted into a several number of lower rates subcarrier signals. In this thesis, there are five different types of the techniques introduced to strengthen the communication quality and capacity.
This kind of new standard of transmission of data is the first one to perform with OFDM in data packet based communication system. In wireless communication network, the abstraction of parallel transmission of data symbols is implemented to attain high throughput and effective transmission quality. The OFDM is a method to deal with parallel transmission.
Inhaltsverzeichnis (Table of Contents)
- Chapter 1
- INTRODUCTION
- Overview of OFDM
- Modulation and Demodulation of OFDM
- Advantage of OFDM System
- History of Channel Estimation and Selection
- Pilot Assisted Channel Estimation
- Cyclic Prefix
- Overview of PAPR
- Motivation
- Objective of the Research Work
- Methodologies of Research Work
- Addition of Cyclic Prefix
- Comb type and Block type Pilot Schemes
- Clipping based SLM PTS Technique
- Thesis Organization
- Chapter 2
- LITERATURE REVIEW
- Review on Inter Carrier Interference Reduction in OFDM
- Survey on Peak Cancelation Techniques
- Overview of Power Line Communication System in OFDM
- Review on MIMO OFDM System
- Existing Techniques for BER and SNR Analysis
- Survey of Earlier Schemes for PAPR Reduction
- Summary
- Chapter 3
- ENHANCEMENT OF COMMUNICATION QUALITY AND CAPACITY IN OFDM SIGNAL
- Problem Statement
- Contribution of the Research Work
- Significant Principle of an OFDM System
- Overview of Power Line Communication
- Single Carrier Technology
- Spread Spectrum Technique
- FFT and IFFT based Peak Cancellation
- Traditional ICI Reduction Techniques
- Frequency Domain Equalization
- Time Domain Windowing
- Maximum Likelihood Estimation
- Proposed Communication Quality and Capacity Enhancement Techniques
- Wavelet OFDM for Power Line Communication
- Peak Cancellation of the Digital OFDM Symbol
- ICI Reduction Technique for OFDM with Phase Noise over Fading Channels
- Result and Discussion
- Evaluation Metrics
- Performance Analysis of Wavelet Transform for PLC
- Performance Analysis of Peak Cancellation of the OFDM
- Performance Analysis of ICI Cancellation of the OFDM
- Summary
- Chapter 4
- WAVELET TRANSFORM BASED BER AND SNR ESTIMATION IN MIMO OFDM
- Problem Statement
- Contribution of the Research Work
- Overview of MIMO OFDM
- Channel Estimation
- Wavelet Technique in OFDM
- Existing HAAR DWT Technique in OFDM
- Proposed Techniques for Turbo HAAR DWT
- System Model
- Turbo Code using MIMO OFDM System
- Modulation
- Proposed HAAR DWT Technique in the MIMO OFDM System
- Orthogonal Space Time Block Code
- Turbo Decoder
- Result and Discussion
- Evaluation Metrics
- System Specification
- Performance Analysis of BER vs SNR for Different modulations with AWGN Channel
- Performance Analysis of BER vs. SNR for Different Modulations with Rician Channel
- Performance Analysis of BER vs. SNR for Different Modulations with combination of AWGN and Rician Channel
- Summary
- Chapter 5
- CLIPPING BASED SLM PTS TECHNIQUE FOR PAPR REDUCTION IN OFDM SYSTEM
- Problem Statement
- Contribution of the Research Work
- Definition of PAPR
- Impact of PAPR
- Basics for PAPR Reduction Method Selection
- PAPR Reduction based on Traditional SLM PTS Technique
- Proposed Clipping SLM PTS Technique
- Clipping with SLM PTS technique
- Analysis of the Computational Complexity
- Result and Discussion
- Experimental Setup
- Evaluation Metric
- Performance Analysis of Existing and Proposed PAPR Reduction Technique
- Summary
Zielsetzung und Themenschwerpunkte (Objectives and Key Themes)
This research work focuses on enhancing the communication quality and capacity of Orthogonal Frequency Division Multiplexing (OFDM) systems by addressing key challenges related to peak-to-average power ratio (PAPR) reduction, inter-carrier interference (ICI) mitigation, and bit error rate (BER) performance in various communication environments. The primary objective is to develop and evaluate innovative techniques that optimize the performance of OFDM systems, particularly in scenarios involving power line communication (PLC) and multiple-input multiple-output (MIMO) systems.
- Improving the efficiency of data transmission in OFDM systems.
- Reducing the Peak to Average Power Ratio (PAPR) in OFDM signals.
- Mitigating Inter-Carrier Interference (ICI) to enhance signal quality.
- Optimizing the performance of OFDM in power line communication channels.
- Investigating the use of Wavelet transforms in MIMO-OFDM systems.
Zusammenfassung der Kapitel (Chapter Summaries)
- Chapter 1: Provides an introduction to OFDM, its advantages, and challenges. It also discusses the history of channel estimation and selection, PAPR, motivation for the research, objectives, methodologies, and thesis organization.
- Chapter 2: Presents a comprehensive literature review covering various aspects of OFDM, including ICI reduction techniques, peak cancellation methods, power line communication systems, MIMO-OFDM systems, BER and SNR analysis, PAPR reduction techniques, and existing research on these areas.
- Chapter 3: Delves into the enhancement of communication quality and capacity in OFDM signals. It identifies the problem statement, contributions of the research, fundamental principles of OFDM, an overview of power line communication, FFT and IFFT-based peak cancellation, traditional ICI reduction techniques, and proposed techniques for improving communication quality and capacity, including Wavelet OFDM for power line communication, peak cancellation of digital OFDM symbols, and ICI reduction techniques for OFDM with phase noise over fading channels. It also includes a discussion of results and performance analysis for these techniques.
- Chapter 4: Focuses on Wavelet transform-based BER and SNR estimation in MIMO-OFDM systems. It outlines the problem statement, research contributions, an overview of MIMO-OFDM, wavelet techniques in OFDM, existing HAAR DWT techniques, proposed techniques for turbo HAAR DWT, a detailed explanation of the system model, turbo coding, modulation, HAAR DWT technique in MIMO-OFDM systems, orthogonal space-time block code, turbo decoder, and comprehensive results and discussions.
- Chapter 5: Explores the use of clipping-based Selective Mapping Partial Transmit Sequence (SLM PTS) technique for PAPR reduction in OFDM systems. It defines PAPR, its impact, basics of PAPR reduction method selection, traditional SLM PTS techniques, the proposed clipping SLM PTS technique, analysis of computational complexity, results, and discussion.
Schlüsselwörter (Keywords)
The core keywords and focus topics of this research include Orthogonal Frequency Division Multiplexing (OFDM), Peak to Average Power Ratio (PAPR) reduction, Inter-Carrier Interference (ICI) mitigation, Bit Error Rate (BER) performance, Signal to Noise Ratio (SNR) analysis, Power Line Communication (PLC), Multiple-Input Multiple-Output (MIMO) systems, Wavelet transforms, HAAR Discrete Wavelet Transform (HAAR DWT), Turbo coding, Selective Mapping Partial Transmit Sequence (SLM PTS), and clipping-based PAPR reduction techniques. This research investigates the application of these concepts to enhance the communication quality and capacity of OFDM systems in various scenarios.
- Arbeit zitieren
- Dr. Lokesh Chikkananjaiah (Autor:in), 2019, The Orthogonal Frequency Division Multiplexing (OFDM). Introduction and explanation of five different types of techniques, München, GRIN Verlag, https://www.grin.com/document/980234
