DocumentCode :
2086751
Title :
Throughput maximization for energy harvesting nodes transmitting over time-varying channels
Author :
Qing Bai ; Nossek, Josef A.
Author_Institution :
Inst. for Circuit Theor. & Signal Process., Tech. Univ. Munchen, Munich, Germany
fYear :
2013
fDate :
9-13 June 2013
Firstpage :
4174
Lastpage :
4179
Abstract :
We investigate in this work the throughput maximizing transmission strategies of an energy harvesting transmitter which communicates over a time-varying channel. Two system models are considered to this end, the generic model for which the energy harvesting node is treated as a continuous-time control system, and the MQAM model for which practical modulation schemes are employed for transmission. A generalized circuit power function dependent on the transmit power is formulated for the generic model. We apply optimal control theory with this model and propose a modified water-filling algorithm to obtain the optimal transmission policy. The circuit power modelling with MQAM transmissions, on the other hand, is based on studies on the power dissipation of various functional components of the transmitter circuitry. Energy-efficient modulation orders can be found and the throughput maximization becomes a linear optimization problem in this case. A heuristic algorithm with near-optimal performance is also developed to conquer the difficulty of problems with large number of variables. Besides, the dynamic programming (DP) technique is applied with both system models which not only verifies the optimality of our obtained power allocations, but also provides an online solution to the situation that the transmitter does not have in advance the full channel state information (CSI) of the entire time slot of interest.
Keywords :
continuous time systems; dynamic programming; energy harvesting; linear programming; optimal control; quadrature amplitude modulation; time-varying channels; DP technique; MQAM model; MQAM transmission; circuit power modelling; continuous-time control system; dynamic programming; energy harvesting nodes; energy harvesting transmitter; energy-efficient modulation order; full channel state information; generalized circuit power function; generic model; heuristic algorithm; linear optimization problem; modified water-filling algorithm; modulation scheme; near-optimal performance; optimal control theory; optimal transmission policy; power dissipation; throughput maximization transmission strategy; time-varying channels; transmit power; Decision support systems; Erbium; High definition video; Niobium;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications (ICC), 2013 IEEE International Conference on
Conference_Location :
Budapest
ISSN :
1550-3607
Type :
conf
DOI :
10.1109/ICC.2013.6655217
Filename :
6655217
Link To Document :
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