Optimum power loading for non-coherent frequency-selective relay channels

  • Authors:
  • Yanwu Ding;Murat Uysal

  • Affiliations:
  • Department of Electrical Engineering and Computer Science, Wichita State University, Wichita, KS;Department of Electrical and Computer Engineering, University of Waterloo, ON, Canada

  • Venue:
  • MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
  • Year:
  • 2009

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Abstract

In this paper, we investigate the information theoretical performance of a cooperative OFDM (orthogonal frequency division multiplexing) system with imperfect channel estimation. Assuming the deployment of a training-aided channel estimator, we derive a lower bound on the achievable rate for the cooperative OFDM system with amplify-and-forward relaying over frequency-selective Rayleigh fading channels. The bound is later utilized to optimally allocate power between the training and data transmission phases for the cooperating nodes. Monte-Carlo simulations demonstrate that the proposed power allocation scheme brings 5 to 15 percent improvement in the achievable rate.