Design and evaluation of a new MAC protocol for long-distance 802.11 mesh networks
Proceedings of the 11th annual international conference on Mobile computing and networking
Fundamentals of wireless communication
Fundamentals of wireless communication
Long-distance 802.11b links: performance measurements and experience
Proceedings of the 12th annual international conference on Mobile computing and networking
Using emulation to understand and improve wireless networks and applications
NSDI'05 Proceedings of the 2nd conference on Symposium on Networked Systems Design & Implementation - Volume 2
Micro power management of active 802.11 interfaces
Proceedings of the 6th international conference on Mobile systems, applications, and services
Beyond pilots: keeping rural wireless networks alive
NSDI'08 Proceedings of the 5th USENIX Symposium on Networked Systems Design and Implementation
A case for adapting channel width in wireless networks
Proceedings of the ACM SIGCOMM 2008 conference on Data communication
Tegola tiered mesh network testbed in rural Scotland
Proceedings of the 2008 ACM workshop on Wireless networks and systems for developing regions
Enabling MAC protocol implementations on software-defined radios
NSDI'09 Proceedings of the 6th USENIX symposium on Networked systems design and implementation
Cross-layer wireless bit rate adaptation
Proceedings of the ACM SIGCOMM 2009 conference on Data communication
Dynamic spectrum access in DTV whitespaces: design rules, architecture and algorithms
Proceedings of the 15th annual international conference on Mobile computing and networking
Frequency-aware rate adaptation and MAC protocols
Proceedings of the 15th annual international conference on Mobile computing and networking
Energy-efficient link adaptation in frequency-selective channels
IEEE Transactions on Communications
Supporting demanding wireless applications with frequency-agile radios
NSDI'10 Proceedings of the 7th USENIX conference on Networked systems design and implementation
WiLdnet: design and implementation of high performancewifi based long distance networks
NSDI'07 Proceedings of the 4th USENIX conference on Networked systems design & implementation
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White space frequencies are highly attractive for long-distance communication due to greater signal propagation. The lack of standards and licensing issues with increased flexibility provided by the cognitive radio allow for sophisticated customized solutions for white spaces. Rural-area networks are seen as the main beneficiaries and white spaces communication is expected to outperform current wireless solutions in this domain. However, rural networks often have to rely on a constrained energy budget and highly benefit from energy-efficient operation. We investigate the efficiency of flexible wireless transmission over long-distance white space links. We theoretically and experimentally examine the impact of channel width, modulation and coding and transmission amplitude on energy consumption. From our findings we derive the physical layer parameter settings that achieve energy optimality and develop PowerRate, a protocol that dynamically adjusts transmission parameters according to channel state. We implement PowerRate in GNUradio and evaluate its energy-saving potential in various fading environments.