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

Authors:
Li-Chun Wang;Jane-Hwa Huang;Anderson Chen;Chung-Ju Chang
Affiliations:
Department of Communication Engineering, National Chiao Tung University, Hsinchu, Taiwan, ROC 300;Department of Communication Engineering, National Chiao Tung University, Hsinchu, Taiwan, ROC 300;Information & Communications Research Laboratories, Industrial Technology Research Institute of Taiwan, Hsinchu, Taiwan, ROC 300;Department of Communication Engineering, National Chiao Tung University, Hsinchu, Taiwan, ROC 300
Venue:
Wireless Personal Communications: An International Journal
Year:
2009

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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.