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The demand for high data-rate multimedia wireless communications has been growing rapidly. As standards are addressing higher capacity wireless links to meet increasing demands, device power consumption is also increasing. Although silicon technology is progressing exponentially, doubling about every two years, processor power consumption is also increasing by 150% every two years. In contrast, the improvement in battery technology is much slower, increasing a modest 10% every two years, leading to an exponentially increasing gap between the demand for energy and the battery capacity offered. Furthermore, the shrinking device sizes are also imposing an ergonomic limit on the battery capacity available.
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