Statistical resource allocation for multi-band Cognitive Radio systems

Joseph Wynn Mwangoka, Khaled Letaief, Zhigang Cao

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A recent development in wireless communications is Cognitive Radio (CR) technology, an innovative design approach which allows the realization of optimal allocation of the scarce radio resources such as the spectrum. Successful resource allocation in CR systems has to overcome the uncertainty of spectrum bands availability as well as the chaotic wireless propagation environment. Previously, most research in resource allocation in CRs has mainly concentrated on the spectrum opportunity discovery aspect while the robust QoS performance problem has remained largely unexplored. In this paper, we jointly consider the power control and spectrum band discovery problems under uncertain CR operative environments. This problem setting is a direct analogy of the portfolio optimization (PO) concept. In PO, once the variance of return is known, then an investor can use the information to find a wealth allocation strategy so as to minimize the investment risk. Similarly, in uncertain CR scenarios, once the variance of a QoS parameter (e.g., throughput) is known, then a power allocation strategy can be obtained leading to reliable communication. The resulting power strategy also marks out the subbands to be used - essentially achieving soft spectrum sensing. In this work, we shall use the concept of portfolio optimization to jointly achieve power control and subband allocation over uncertain CR environments. The limitations of the approaches are investigated through the sensitivity analysis of the solutions obtained. A raw data processing approach will also be given leading to an alternative algorithm for stable data processing. Numerical results are presented to demonstrate the potential of the proposed approaches.

Original languageEnglish
Pages (from-to)116-126
Number of pages11
JournalPhysical Communication
Volume2
Issue number1-2
DOIs
Publication statusPublished - Mar 2009
Externally publishedYes

Fingerprint

resource allocation
Radio systems
Cognitive radio
Resource allocation
Power control
optimization
Quality of service
Communication
wireless communication
sensitivity analysis
Power spectrum
Sensitivity analysis
availability
resources
communication
Throughput
Availability
propagation

Keywords

  • Cognitive radio
  • Non-contiguous OFDM
  • Quadratic programming
  • Robust resource allocation
  • Soft spectrum sensing

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Statistical resource allocation for multi-band Cognitive Radio systems. / Mwangoka, Joseph Wynn; Letaief, Khaled; Cao, Zhigang.

In: Physical Communication, Vol. 2, No. 1-2, 03.2009, p. 116-126.

Research output: Contribution to journalArticle

Mwangoka, Joseph Wynn ; Letaief, Khaled ; Cao, Zhigang. / Statistical resource allocation for multi-band Cognitive Radio systems. In: Physical Communication. 2009 ; Vol. 2, No. 1-2. pp. 116-126.
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