Optimal bit and power loading for amplify-and-forward cooperative OFDM systems

Osama Amin, Murat Uysal

Research output: Contribution to journalArticlepeer-review


In this paper, we investigate bit and power allocation strategies for an orthogonal frequency division multiplexing (OFDM) cooperative network over frequency-selective fading channels. We assume amplify-and-forward relaying and consider the bit error rate (BER) performance as our performance measure. Aiming to optimize the BER under total power constraint and for a given average data rate, we propose three adaptive algorithms; optimal power loading (OPL), optimal bit loading (OBL), and optimal joint bit and power loading (OBPL). Our Monte Carlo simulation results demonstrate performance gains through adaptive bit and power loading over conventional non-adaptive systems as well as currently available adaptive cooperative scheme in the literature. The impact of practical issues on the performance of proposed adaptive schemes such as imperfect channel estimation and limited feedback is further discussed.

Original languageEnglish (US)
Article number5692975
Pages (from-to)772-781
Number of pages10
JournalIEEE Transactions on Wireless Communications
Issue number3
StatePublished - Mar 2011


  • OFDM
  • amplify-and-forward relaying
  • bit allocation
  • cooperative network
  • power allocation

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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