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Wireless Personal Communications

, Volume 51, Issue 3, pp 379–397 | Cite as

Cross-Layer Analysis of Joint Rate and Power Adaptation in Nakagami Fading Channels with Multiple-User Contention

  • Li-Chun WangEmail author
  • Jane-Hwa Huang
  • Anderson Chen
  • Chung-Ju Chang
Article
  • 54 Downloads

Abstract

Adaptively adjusting transmit rate and power concurrently to enhance goodput and save energy is a challenging issue in a wireless local area network (WLAN) because goodput enhancement and energy saving are usually two contradictory goals. In this paper, we propose channel-driven rate and power adaptation (CDRPA) schemes and develop a physical (PHY)/medium access control (MAC) cross-layer analytical method incorporating the impacts of Nakagami fading channel and the carrier sense multiple access (CSMA) MAC protocol. The CDRPA scheme has much lower computation complexity than the energy-optimal complete-search scheme. In a multiuser contention scenario, we analyze the energy efficiency and the goodput of the power-first and rate-first CDRPA schemes as well as the energy-optimal complete-search adaptation scheme. At the cost of lower goodput, the power-first scheme has better energy efficiency than the rate-first CDRPA scheme, whereas if the goodput is the main concern, the rate-first CDRPA scheme shall be chosen due to better goodput performance. More interestingly, we find that the power-first CDRPA scheme can achieve about the same goodput and energy efficiency as the energy-optimal complete-search link adaptation scheme.

Keywords

Wireless local area network (WLAN) Rate and power adaptation Cross-layer analysis 

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Copyright information

© Springer Science+Business Media, LLC. 2009

Authors and Affiliations

  • Li-Chun Wang
    • 1
    Email author
  • Jane-Hwa Huang
    • 1
  • Anderson Chen
    • 2
  • Chung-Ju Chang
    • 1
  1. 1.Department of Communication EngineeringNational Chiao Tung UniversityHsinchuTaiwan, ROC
  2. 2.Information & Communications Research LaboratoriesIndustrial Technology Research Institute of TaiwanHsinchuTaiwan, ROC

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