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Outage-dependent and traditional power optimisations for amplify and forward incremental relaying with channel estimation errors

Outage-dependent and traditional power optimisations for amplify and forward incremental relaying with channel estimation errors

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  • Author(s): F.S. Tabataba 1 ; P. Sadeghi 2 ; M.R. Pakravan 1
    • View affiliations
    • Affiliations: 1: Data Networking Research Lab, Department of Electrical Engineering, Sharif University of Technology, Advanced Communications Research Institute (ACRI), Tehran, Iran
      2: Research School of Engineering, The Australian National University, Canberra, Australia
  • Source: Volume 6, Issue 10, 3 July 2012, p. 1234 – 1244
    DOI:  10.1049/iet-com.2011.0726 , Print ISSN 1751-8628, Online ISSN 1751-8636
© The Institution of Engineering and Technology
Published

In this study, the authors optimise the outage probability of amplify and forward incremental relaying (IR) scheme using two different power allocation methods in the presence of channel estimation errors. The authors find the outage probability of IR scheme and minimise it subject to traditional power (TP) constraint in which the sum of nodes' powers is fixed and outage-dependent power (ODP) constraint which is compatible with the physical concept of IR and takes into account the quality of the direct path in the optimisation problem. The authors provide closed-form expressions to allocate power to pilot and data symbols of both the source and the relay. Although, their analysis uses high signal-to-noise-ratio (SNR) approximation, the analytical solutions perform very close to optimal ones obtained through global numerical search. The authors show that ODP constraint has substantial superiority over TP constraint, especially when the relay is placed close to the source. Moreover, the authors compare power-optimised IR subject to the mentioned power constraints with equal power allocation scheme and show the impact of power optimisation on the outage performance of IR system.

Inspec keywords: approximation theory; channel estimation; probability; amplify and forward communication

Other keywords: power allocation methods; optimisation problem; channel estimation errors; power constraints; outage probability; traditional power optimisations; outage-dependent; amplify and forward incremental relaying; signal-to-noise-ratio approximation

Subjects: Communication channel equalisation and identification; Radio links and equipment; Other topics in statistics; Interpolation and function approximation (numerical analysis)

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