Spectrum Shaping Challenges in Dynamic Spectrum Access Networks with Transmission Hyperspace

Abstract

Our goal in this paper is to discuss several issues and challenges involved with dynamic spectrum access in cognitive radio networks (CRNs). In this context, we introduce three optimization problems for spectrum shaping in cognitive radio networks (CRNs) using orthogonal frequency division multiplexing (OFDM). These optimization problems utilize the concept of transmission hyperspace (TH). The first problem involves maximization of sum-rate of the network under primary and secondary quality-of-service (QoS) constraints utilizing frequency and space dimensions of the TH. The second problem relaxes the omnidirectional assumption and incorporates antenna directionality in the first problem. As for the third problem, time dimension of the TH is added to the first two problems and the resulting problem is formulated as a time scheduling problem. We show that all these problems are NP-hard which requires the development of efficient heuristic algorithms.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2012
Accession Number
ADA562485

Entities

People

  • Andrew L. Drozd
  • Chilukuri K. Mohan
  • Engin Masazade
  • Irina Kasperovich
  • Onur Özdemir
  • Pramod Varshney
  • Richard Loe
  • Stephen Reichhart

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Algorithms
  • Cognitive Radio
  • Communication Networks
  • Directional
  • Directional Antennas
  • Frequency
  • Frequency Bands
  • Frequency Division Multiplexing
  • Military Research
  • Omnidirectional
  • Omnidirectional Antennas
  • Optimization
  • Orthogonal Frequency Division Multiplexing
  • Spectra
  • Throughput

Fields of Study

  • Computer science

Readers

  • Computer Networking
  • Distributed Systems and Data Platform Development
  • Radio communications and signal processing.

Technology Areas

  • Space