Performance Optimization of Digital Communications Systems

Published:
March 21, 2006 by Auerbach Publications - 224 Pages
Author(s):
Vladimir Mitlin, Mitlin & Associates, San Diego, California, USA

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$129.95
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ISBN 9780849368967
Cat# AU6896
 

Features

  • Provides analytical and simulation approaches to performance optimization in digital networks
  • Examines the estimation of the signal-to-noise ratio (SNR) of a communications channel in a complex multipath propagation environment
  • Reviews a method of pulse shaping: the generation of low-complexity, spectrally efficient pulses for digital communications
  • Presents a general methodology for optimal selection of the automatic repeat request (ARQ) parameters in quadrature amplitude modulation channels
  • Analyzes the performance optimization of multicarrier systems with forward error correction and ARQ
  • Discusses the estimation of the bit error rate of self-similar constellations in ADSL systems
  • Develops an exact solution for the throughput of a general duplex communications channel with forward error correction and ARQ
  • Details how to break a TCP/IP message into MAC packets in networks compliant with the IEEE 802.11 wireless LAN standard

    • Summary

    Because fine-tuning the parameters of a system is critical to a developer's success, Performance Optimization of Digital Communications Systems examines particular optimization problems in digital communications, presenting analytical techniques in combination with SystemView and MATLAB® simulations. Consisting of ten chapters, this monograph presents a unique method for determining the quality of a communications channel - a great advantage to any company that uses this method. The book presents a method for the transmission of proprietary data. It also describes the means to reduce the peak-to-average power ratio and introduces optimal phase shifters for multicarrier communication systems.

    This volume contains numerous illustrations and includes appendices that offer optimization puzzles, MATLAB scripts, and some newly discovered properties of flat-spectrum and spectrum-shaped waveforms.

    Table of Contents

    Introduction
    About This Book
    Acknowledgments

    Method for Determining the Quality of a
    Communication Channel
    Background
    Main Idea Illustrated and a Minimization Principle
    Phase-Spanning Nyquist Set Test
    Frequency-Spanning Nyquist Set Test
    Determining the Noise Level in a Nonbaseband System
    Measuring the Level of a Useful Signal
    Conclusions

    Digital Communications in Stealth Mode
    Background
    Stealth Communications Transceiver
    Test on Randomness
    BER Performance
    Using a Decoy Signal
    Conclusions

    Pulse Shape Optimization
    Background
    Pulse Shape Optimization Criterion
    SO-Pulse and L-Pulse
    Phi-Pulse
    BER Test
    Approximation of Pulses by SAS
    Data Windows Corresponding to the Pulses Introduced
    Raised Pulses
    Conclusions

    Optimal Phase Shifters for Peak-to-Average Power Ratio
    Reduction in Multicarrier Communication Systems
    Background
    Optimal Phase Shifters and the Constant Envelope Principle
    Flat Spectrum Chirps
    Simulations of Multicarrier Transmission
    Possible Applications of FSC
    Conclusions

    Optimization of the Automatic Repeat Request Parameters
    in Quadrature Amplitude Modulation Channels
    Background
    Derivation of the BER of a QAM Channel with FEC and ARQ
    ARQ Performance Gain
    A Method of Estimating the ARQ Gain
    A Procedure for Determining the Optimum ARQ Parameters
    Extension of the Method for the Case of a Slowly Fading
    Channel
    Determining the Average Number of Transmissions and the
    Uncoded SER, Given the SER Past FEC/ARQ
    Determining an Average Fraction of Erroneous Bits in an
    Erroneous QAM Symbol
    Conclusions

    Optimal Selection of Error Correction and Retransmission
    Parameters in Multichannel Communications Systems
    Background
    Performance Gain Due to FEC/ARQ in Discrete Multitone
    Systems
    Mean-Field Approximation for Multicarrier Channel
    with ARQ
    An Approximate Solution of Equation 7.2.2
    Optimization of FEC and ARQ Parameters for Current ADSL
    Standards
    Conclusions

    Bit Error Rate of Self-Similar Constellations
    in ADSL Systems
    Background
    Self-Similarity of ADSL QAM Constellations
    Error Probability Function of an ADSL QAM Constellation Encoder
    Nonsquare Constellations: An Asymptotic Analysis
    Comparison with Numerical Simulations
    Conclusions

    Throughput Optimization in a General Duplex
    Communications System with FEC and ARQ
    Background
    A System Model with FEC and ARQ
    Joint Optimization of FEC and ARQ Parameters in Both Directions
    Conclusions

    A Quantitative Procedure of Optimizing the MAC Packet
    Size in TCP/IP-Compliant Networks
    Background
    Statement of the Problem of Optimizing the MAC Packet Size
    in TCP/IP-Compliant Networks
    Derivation of Equation 10.2.6
    Determining the Optimal MAC Packet Size in the Case of a
    Variable MAC Frame Length
    Solution to the Problem and Decision Diagrams
    Extension of the Method in the Case of a Fixed MAC Frame
    Length
    Extension of the Method to Account for Error Detection
    and Retransmission in the TCP/IP Protocol
    Application to 802.11-Compliant Networks
    Conclusions

    Appendices
    A
    Optimization Puzzles

    B
    MATLAB Scripts for the Bandwidth Optimization Problem

    C
    More about Flat Spectrum Chirps

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