![]() With this motivation in mind, the authors proposed two neat ideas to enable down-clocking on 802.11b: compressive sensing during packet receptionto signal down-sampling during transmission. While lowering clock rate during data transmission might not sound beneficial as during reception, theauthors argue that it is necessary in practice because the granularity of WiFi channel access is much faster than clock rate adaptation, so transmission and reception must operate at the same clock rate. Different from E-MiLi, SloMo applies the concept of down-clocking all the way to the entire WiFi operation, including both data transmission and reception. The work is related to a recent work, E-MiLi, which saves energy by ``down clocking" the WiFi radio during idle listeningperiods. SloMo is an interesting approach to further reduce smartphone energy consumption by operating the WiFi chipset at a (much) lower clock rate. Our prototype remains fully functional when the clock rate is reduced by a factor of five, potentially reducing power consumption by over 30%. We have implemented our 802.11b-based design in a software radio platform, and show that it seamlessly interacts with existing WiFi deployments. Leveraging the inherent sparsity in Direct Sequence Spread Spectrum (DSSS) modulation, we propose a transceiver design based on compressive sensing that allows WiFi devices to operate their radios at lower clock rates when receiving and transmitting at low bit rates, thus consuming less power. ![]() We observe, however, that many of these same applications have relatively low bandwidth requirements. Unfortunately, applications found on today’s wireless devices often require frequent access to the channel. The fundamental limitation with this approach, however, is that the radio is incapable of transmitting or receiving unless it is fully powered. Hence, modern devices fastidiously manage their radios, shifting into low-power listening or sleep states whenever possible. As manufacturers continue to improve the energy efficiency of battery-powered wireless devices, WiFi has become one of-if not the-most significant power draws.
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