Principles of mobile communication (2nd ed.)
Principles of mobile communication (2nd ed.)
A rate-adaptive MAC protocol for multi-Hop wireless networks
Proceedings of the 7th annual international conference on Mobile computing and networking
Goodput Analysis and Link Adaptation for IEEE 802.11a Wireless LANs
IEEE Transactions on Mobile Computing
MiSer: an optimal low-energy transmission strategy for IEEE 802.11a/h
Proceedings of the 9th annual international conference on Mobile computing and networking
Cross-layer optimization of multipoint message broadcast in MANETs
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
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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.