Sum Capacity (Sub)optimality of Orthogonal Transmissions in Vector Gaussian Multiple Access Channels

Abstract

We study in this paper the sum capacity achievability of orthogonal transmissions in vector Gaussian multiple access channels (MAC). Specifically, we derive the sufficient and necessary conditions, in terms of channel matrices and transmitter power constraints, for orthogonal transmission to achieve the sum capacity of a vector Gaussian MAC. The obtained conditions provide a unified framework in explaining many of the results that are intuitively true. They also enable us to explore cases that have not been addressed to determine the (sub)optimality of orthogonal transmissions compared with the overlay transmission.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 2007
Accession Number
ADA489671

Entities

People

  • Biao Chen
  • John Matyjas
  • Xiaohu Shang

Organizations

  • Syracuse University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Air Force
  • Air Force Research Laboratories
  • Bandwidth
  • Channel Allocation
  • Channel Models
  • Channel State Information
  • Frequency
  • Frequency Allocation
  • Frequency Bands
  • Frequency Division Multiple Access
  • Index Terms
  • Information Operations
  • Military Research
  • Multiple Access
  • Signal Processing
  • Transmitters

Readers

  • Linear Algebra
  • Radio communications and signal processing.
  • Systems Analysis and Design