Channel-Aware Energy Optimization of OFDM Receivers Using Dynamic Precision Scaling in FPGAsReport as inadecuate




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* Corresponding author 1 CAIRN - Energy Efficient Computing ArchItectures with Embedded Reconfigurable Resources Inria Rennes – Bretagne Atlantique , IRISA-D3 - ARCHITECTURE 2 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.

Keywords : Index Terms— Fixed-point arithmetic energy reduction OFDM receiver variable wordlength





Author: Fernando Cladera - Matthieu Gautier - Olivier Sentieys -

Source: https://hal.archives-ouvertes.fr/



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