Transmission Subspace Tracing for MIMO Communications Systems

Abstract

This paper describes the benefits of transmission subspace tracking for multiple input multiple output communications systems, and applies the concepts of previous work on adaptive transmit antenna algorithms to this problem. A specific stochastic gradient technique of subspace or "multi-mode" tracking of the independent modes of the MIMO transfer function and the application to space time coding is considered. The technique provides gains by tracking the active modes when there are more transmit than receive antennas. With the proposed algorithm, the receiver generates binary feedback selecting preferred perturbed weights, which gives the transmitter a gradient estimate useful for subspace tracking. The capability resulting from this approach is shown by simulation.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 2001
Accession Number
ADA506824

Entities

People

  • Brian C. Banister
  • James R. Zeidler

Organizations

  • Naval Information Warfare Systems Command

Tags

DTIC Thesaurus Topics

  • Algorithms
  • Channel Estimation
  • Communications Techniques
  • Computer Programming
  • Data Rate
  • Department Of Defense
  • Engineering
  • Feedback
  • Frequency
  • Modulation
  • Multiple Input Multiple Output
  • Signal Processing
  • Simulations
  • Transfer Functions
  • Transmitters
  • United States Government
  • Wireless Communications

Fields of Study

  • Engineering

Readers

  • Linear Algebra
  • Radio communications and signal processing.
  • Robotics and Automation.

Technology Areas

  • Space
  • Space - Space Objects