Cross-layer performance analysis of joint rate and power adaptation schemes with multiple-user contention in Nakagami fading channels

Li-Chun Wang*, Kuang Nan Yen, Jane Hwa Huang, Anderson Chen, Chung Ju Chang

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

Adaptively adjusting transmission rate and power to concurrently enhance goodput and save energy is an important issue in the wireless local area network (WLAN). However, goodput enhancement and energy saving are two contradictory goals, since high data rate usually requires high transmission power to meet the bit-error-rate (BER) requirement. To achieve the tradeoff between energy efficiency and goodput, therefore, we suggest a fast channel-driven rate and power adaptation (CDRPA) algorithm. Furthermore, we develop a physical (PHY)/medium access control (MAC) cross-layer analytical method to evaluate goodput and energy efficiency, incorporating the impacts of Nakagami fading channel and the carrier sense multiple access (CSMA) MAC protocol. This paper compares two adaptation schemes. The power-first scheme first selects the transmission power and then the data rate, aiming at energy saving. On the contrary, the rate-first scheme first selects the data rate and then the transmission power, aiming to enhance goodput. Numerical results show that the power-first scheme achieves better energy efficiency. However, the rate-first CDRPA scheme can indeed boost goodput, while maintaining comparable energy efficiency as the power-first scheme.

Original languageEnglish
Title of host publicationIWCMC 2006 - Proceedings of the 2006 International Wireless Communications and Mobile Computing Conference
Pages881-886
Number of pages6
DOIs
StatePublished - 1 Dec 2006
EventIWCMC 2006 - 2006 International Wireless Communications and Mobile Computing Conference - Vancouver, BC, Canada
Duration: 3 Jul 20066 Jul 2006

Publication series

NameIWCMC 2006 - Proceedings of the 2006 International Wireless Communications and Mobile Computing Conference
Volume2006

Conference

ConferenceIWCMC 2006 - 2006 International Wireless Communications and Mobile Computing Conference
CountryCanada
CityVancouver, BC
Period3/07/066/07/06

Keywords

  • Joint rate and power adaptation
  • PHY/MAC cross-layer analysis

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