Quadrature Clock Modulation Versus Binary and Quadrature Phase Shift Keying in the Presence of Intersymbol Interference.

Abstract

Quadrature Clock Modulation (QCM) is a binary phase shift keying (BPSK) technique in which alternate bits are transmitted orthogonally. Compared to normal BPSK modulation, QCM improves the performance of a communication system which is limited by intersymbol interference (ISI). Compared to quadrature phase shift keying (QPSK) for the same information rates, QCM is slightly inferior in data detection performance. The average carrier tracking capability of a QCM scheme is equal to that of BPSK for the same closed-loop bandwidth and time bandwidth product (BT) of the channel filter at a specified signal energy to noise ratio (Eb/No). The data detection performance for QCM, BPSK, and QPSK is analyzed by comparing the one-shot probability of error conditioned on a phase error as a function of Eb/No and BT for a specified channel filter. Carrier tracking performance for QCM and BPSK is analyzed by obtaining an average phase error variance for the linear model of a Costas loop.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1977
Accession Number
ADA056518

Entities

People

  • Gary A. White

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • C4I
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Command And Control Systems
  • Communication Systems
  • Computer Programming
  • Computer Programs
  • Computers
  • Data Rate
  • Detection
  • Detectors
  • Intersymbol Interference
  • Mathematical Models
  • Models
  • Modulation
  • New Jersey
  • Phase Shift
  • Probability
  • United States

Fields of Study

  • Engineering

Readers

  • Radio communications and signal processing.