Energy-bandwidth Tradeoff in Wireless Networks.

Energy Efficiency;Bandwidth Efficiency;Wireless Multi-hop Networks;Convex Optimization;Electrical Engineering;Engineering;Electrical Engineering: Systems

Bae, ChanghunSadanandarao, Sandeep P. ;

University of Michigan

关键词: Energy Efficiency;    Bandwidth Efficiency;    Wireless Multi-hop Networks;    Convex Optimization;    Electrical Engineering;    Engineering;    Electrical Engineering: Systems;   

Others  :  https://deepblue.lib.umich.edu/bitstream/handle/2027.42/77816/changhun_1.pdf?sequence=1&isAllowed=y

瑞士|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

To effectively forward data from source to destination in energy-constrained wireless multi-hop networks, this thesis investigates the end-to-end energy-bandwidth tradeoff, and illustrates how an optimal routing path can be selected based on this tradeoff in arbitrary 2-dimensional networks.In this tradeoff, set of relays communicates with each other, trading off the costs in power and bandwidth to achieve the minimum total energy consumption for a given target rate.By contrast, classical energy-bandwidth tradeoff analysis in multi-hop routing network only employs the transmission energy consumption in equi-spaced linear networks.In this thesis we consider energy-constrained wireless multi-hop networks, where each node is powered by a small battery. Under this constraint, reducing energy consumption and utilizing available spectrum are the most important design considerations for such networks,which motivates the analysis of the energy-bandwidth tradeoff. After summarizing a model for the wireless channel, we introduce two performance measures in energy and bandwidth:(1) total energy consumption per information bit that incorporates both the energy radiated by transmitters and the energy consumed by receiversto process the received signals, and (2) end-to-end rate that captures the number of information bits end-to-end transmitted per channel use by any node in the network that is forwarding the data. We analyze the tradeoff between the total energy consumption per information bit and the end-to-end rate for various multi-hop routing scenarios based upon different types of transmission energy and rate. Using convex optimization methods, we show that the best energy-bandwidth tradeoffs or lower bounds can be achieved for general channel capacity models. We show that the total energy consumption per information bit can be minimized by optimally choosing the end-to-end rate, determined from the location of relays and the end-to-end distance. Thus by comparing the total energy consumption per information bit for different routing paths, a routing path which achieves the best energy-bandwidth tradeoff can be obtained. We then extend this analysis to the case with spatial reuse to improve the bandwidth efficiency, and practical channel code with modulation schemes. Finally we investigate cooperation between nodes to further increase the bandwidth utilization for various relaying strategies.