Adaptive Modulation Schemes for OFDM and SOQPSK Using Error Vector Magnitude (EVM) and Godard Dispersion

Abstract

n this paper, we develop a new approach which enables adaptation across two modulation schemes in the iNET standard: orthogonal frequency-division multiplexing (OFDM) and shaped-offset quadrature phased-shift keying (SOQPSK). We present the error vector magnitude (EVM) for OFDM and second-order Godard dispersion (D(2)) for SOQPSK as our link metrics that measure the degradation due to thermal noise and channel effects and then derive the mathematical relationship between these two metrics. This relationship enables us to utilize a set of empirically-derived rules that incorporate both modulation schemes.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2014
Accession Number
ADA619898

Entities

People

  • Brett T. Walkenhorst
  • Enkuang D. Wang
  • Jieying Han

Organizations

  • Air Force Test Center

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Communications Techniques
  • Complex Variables
  • Dispersions
  • Electronic Mail
  • Frequency
  • Frequency Division Multiplexing
  • Frequency Domain
  • Modulation
  • Multipath Channels
  • Multiplexing
  • Orthogonal Frequency Division Multiplexing
  • Phase
  • Phase Modulation
  • Resource Management
  • Simulations
  • Standards
  • Test And Evaluation

Fields of Study

  • Computer science
  • Engineering

Readers

  • Radio communications and signal processing.
  • Regression Analysis.