Resource-Efficient Digital Communications: Research and Testbed Development in Support of Future Force Warrior and Joint Tactical Radio Systems

Abstract

This report describes the design and simulation of a bandwidth-efficient waveform suitable for the SLICE radio developed by ITT Aerospace/Communications; this waveform uses quadrature amplitude modulation (QAM) and low-complexity turbo codes developed at Notre Dame. The result is compared with another using continuous phase modulation (CPM). It is shown that the amplifier backoff required for QAM puts it at a disadvantage to CPM at spectral efficiencies where both are feasible - below 2.0 bits/sec/Hz. However, signal processing techniques (e.g. pre-distortion filtering) for QAM can reduce that disadvantage; moreover, at higher spectral efficiencies, QAM may be the only feasible solution. Other topics include low-density parity check (LDPC) convolutional codes, new techniques to reduce the peak to average power ratio (PAPR) for QPSK signals, and analysis of systems employing adaptive modulation and orthogonal frequency division multiplexing (OFDM).

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 2007
Accession Number
ADA474493

Entities

People

  • Daniel Costello
  • Oliver Collins
  • Thomas E. Fuja
  • Yih-fang Huang

Organizations

  • University of Notre Dame

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Amplitude Modulation
  • Communications Techniques
  • Digital Communications
  • Frequency
  • Frequency Division Multiplexing
  • Low Density
  • Modulation
  • Multiplexing
  • Orthogonal Frequency Division Multiplexing
  • Phase Modulation
  • Radio Equipment
  • Signal Processing
  • Tactical Radios

Fields of Study

  • Engineering
  • Physics

Readers

  • Radio communications and signal processing.

Technology Areas

  • Space