ABSTRACT
The issue of green communications is compounded by the incredible growth of wireless communications in the developing regions which use wireless as a medium to leap frog past traditional wire-line technologies. The primary cost gains arise from the use of low-cost and low-power single-board computers and high-volume low-cost off-the-shelf 802.11 wireless cards using unlicensed spectrum. The nodes connect to others through point-to-point long-distance wireless links with high gain directional antennas. When the Frame Delivery Ratio-Received Signal Strength Indicator relationship is determined in the probing stage, the algorithm enters the adapting stage to adapt its bit rate and txpower to achieve a tradeoff between energy efficiency and link throughput. The energy consumption ratio is defined as the ratio of total energy consumed to the total number of frames successfully received in a given time interval. Extensive simulation shows that energy-efficient rate adaptation algorithm achieves high energy efficiency while retaining considerable throughput gain by jointly selecting bit rates and txpower.
