Rate-Optimal Signal Design for Wireless Communications

Abstract

In a tactical communications scenario, the transmitter will only have an imperfect estimate of the temporally correlated mobile RF channel. Given imperfect channel state information (CSI), we address the optimal signal design problem. Using the cutoff rate metric, we determine: (a) the optimal allocation of power and bandwidth between information and training signals, (b) the optimal binary input as a function of SNR and CSI quality, (c) and adaptive modulation scheme which switches between only two inputs based on the CSI quality. We show that this simple adaptive modulation scheme is nearly optimal at moderate to high SNR. We also establish that there is at most a 1 dB increase in the maximum penalty for using On-Off Keying instead of BPSK.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2004
Accession Number
ADA431575

Entities

People

  • Ananthram Swami
  • Lang Tong
  • Saswat Misra

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Bandwidth
  • Channel Models
  • Channel State Information
  • Communication Systems
  • Detectors
  • Estimators
  • Military Communications
  • Modulation
  • Networks
  • Probability
  • Sensor Networks
  • Statistics
  • Tactical Communications
  • Training
  • Transmitters
  • Wireless Communications

Fields of Study

  • Engineering

Readers

  • Operations Research
  • Radio communications and signal processing.