1st Edition

Analytical Evaluation of Nonlinear Distortion Effects on Multicarrier Signals

By Theresa Araújo, Rui Dinis Copyright 2015
    220 Pages
    by CRC Press

    220 Pages 87 B/W Illustrations
    by CRC Press

    Due to their ability to support reliable high quality of service as well as spectral and power efficiency, multicarrier modulation systems have found increasing use in modern communications services. However, one of the main drawbacks of these systems is their vulnerability to nonlinear distortion effects. Analytical Evaluation of Nonlinear Distortion Effects on Multicarrier Signals details a unified approach to well-known analytical results on memoryless nonlinearities that takes advantage of the Gaussian behavior of multicarrier signals.

    Sharing new insights into the behavior of nonlinearly distorted multicarrier signals, the book begins with a review of the fundamental principles of multicarrier transmission and multicarrier-based systems. Next, it covers well-known results on nonlinear distortion of Gaussian signals and examines the accuracy of the use of Gaussian approximation for evaluating nonlinear effects. It also considers the performance of various multicarrier-based systems in the presence of different types of nonlinear devices.

    • Describes general clipping and filtering techniques to reduce the envelope fluctuations of multicarrier signals
    • Analyzes quantization effects caused by the numerical accuracy required in the DFT computations
    • Discusses quantization requirements of analog-to-digital converters
    • Redefines loading techniques to take into account nonlinear distortion issues on adaptive multicarrier systems
    • Examines the impact of nonlinear signal processing techniques for reducing the envelope fluctuations of OFDMA signals
    • Presents performance results for all the discussed applications

    The book covers the essential principles of multicarrier modulations, including OFDM modulations and other multicarrier schemes. It describes multicarrier modulation systems that will be used in next-generation communications systems and also provides new insight into the behavior of nonlinearly distorted multicarrier signals.

    Illustrating the application of the nonlinear distortion analysis techniques presented, the book provides you with a wide range of analytical tools to assess the effects of nonlinearities on the performance of multicarrier-based schemes.

    List of Abbreviations
    List of Symbols

    Introduction
    Book Structure

    Multicarrier Transmission
    Orthogonal Multicarrier Signals
    Orthogonal Frequency Division Multiplexing
         Transmitter Structure
         Receiver Structure
    Other Multicarrier Schemes
         Discrete Multitone
              Bandpass Approach
               Baseband Approach
         Orthogonal Frequency Division Multiple Access
              Downlink Transmission
              Uplink Transmission
         Multicarrier Code Division Multiple Access
              Downlink Transmission
              Uplink Transmission 
         Software Radio
    Characterization of the Transmitted Signals
         Spectral Characterization
              Other Multicarrier Schemes
         Time Domain Characterization
              Other Multicarrier Schemes
         Envelope Fluctuations

    Nonlinear Distortion of Gaussian Signals
    Memoryless Nonlinearities Characterization
         Memoryless Nonlinear Characteristics
         Cartesian Memoryless Nonlinear Characteristics
         Polar Memoryless Nonlinear Characteristics
    Memoryless Nonlinear Distortion of Gaussian Signals
    Cartesian Memoryless Nonlinearities with Gaussian Inputs
    Polar Memoryless Nonlinearities with Gaussian Inputs

    Accuracy of the Gaussian Approximation for the Evaluation of Nonlinear Effects
    Exact Characterization of Nonlinearly Distorted Multicarrier Signals 
         Nonlinear Characteristic of Order 3
          Nonlinear Characteristic of Order 5
         Generalization
    Analytical Characterization of Nonlinearly Distorted Multicarrier Signals using the Gaussian Approximation
    Accuracy of the Gaussian Approximation
    Discussion

    Nonlinear Effects in Specific Multicarrier Systems
    Clipping and Filtering Techniques
         Transmitter Structure
         Signal Characterization Along the Signal Processing Chain
         Numerical Results
         Analytical BER Performance
         Performance Results
         Complementary Remarks
    Impact of Quantization Effects on Multicarrier Signals 
         Quantization Effects on Multicarrier Modulated Signals
         Statistical Characterization of the Transmitted and Received Signals
         Performance Results
    Impact of Quantization E_ects on Software Radio Signals 
         ADC Quantization in Software Radio Architectures
         Statistical Characterization of the Quantized Signals
         Performance Results
    Loading Techniques with Nonlinear Distortion Effects
         Nonlinear Signal Processing for Multicarrier Signals
         Loading Techniques
              Single Carrier Analysis
              Multicarrier Analysis
              Waterfilling
              Leke-Cioffi Algorithm
         Loading with Nonlinear Distortion Effects
         Performance Results
    Impact of Nonlinear Signal Processing on OFDMA Signals
         Nonlinear Effects on OFDMA Signals
         Statistical Characterization of the Transmitted Signals
         Signal-to-Interference Ratio Levels on the Received Signals
              Multiple Users
              Single User
         Performance Results
              Downlink Transmission
              Uplink Transmission
    Discussion

    Output Autocorrelation for Polar Memoryless Nonlinearities with Gaussian Inputs

    Analytical Results for Specific Nonlinearities
    Cartesian Memoryless Nonlinearities
    Polar Memoryless Nonlinearities

    Exact Characterization of a Polar Memoryless Nonlinearity with Characteristic g(R) = R5
    Generalization

    Approximated Symbol Error Rate for Cross QAM Constellations

    References

    Biography

    Theresa Araújo, Rui Dinis