Channel-Aware Energy Optimization of OFDM Receivers Using Dynamic Precision Scaling in FPGAs

Fernando Cladera 1 Matthieu Gautier 2, * Olivier Sentieys 1
* Auteur correspondant
1 CAIRN - Energy Efficient Computing ArchItectures with Embedded Reconfigurable Resources
Inria Rennes – Bretagne Atlantique , IRISA-D3 - ARCHITECTURE
Abstract : To reduce the energy consumption of Orthogonal Frequency-Division Multiplexing (OFDM) systems, a new variable word-length method is presented in this paper. A simulation based approach is used: the optimized fixed-point implementation of an OFDM receiver is found for different simulated channel conditions, depending on the Signal-to-Noise Ratio (SNR) and the channel type. During the execution, the receiver estimates the channel conditions and chooses the optimum word-length to decode the received information. A realistic energy consumption of the receiver is estimated with a library that contains the energy consumption of Field-Programmable Gate Array (FPGA) basic operators depending on the bit-width, obtained from experimental data. Up to 57% of the dynamic energy can be saved using this method.
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Communication dans un congrès
European Signal Processing Conference (EUSIPCO 2015), Aug 2015, Nice, France
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Fernando Cladera, Matthieu Gautier, Olivier Sentieys. Channel-Aware Energy Optimization of OFDM Receivers Using Dynamic Precision Scaling in FPGAs. European Signal Processing Conference (EUSIPCO 2015), Aug 2015, Nice, France. 〈hal-01175917〉

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