Cross layer design exploration for orthogonal frequency division multiplexing energy-quality trade-offs

Deliang Fan, Purdue University

Abstract

In digital wireless communication systems, the development of computationally intensive blocks not only increases functionality and improves quality but also leads to more power consumption. Many studies have been done to show how to make trade-offs between energy (supply voltage scaling) and quality for a single DSP (Digital Signal Processing) block. However, within a digital communication system, there is more than one DSP block. For example, in an OFDM (Orthogonal Frequency Division Multiplexing) system, the two most computationally intensive blocks are IFFT (Inverse Fast Fourier Transform) and FFT (Fast Fourier Transform). If the supply voltage of IFFT is over-scaled to achieve lower power consumption, leading to some approximation in the IFFT block, the parameters of FFT should also be adjusted to achieve the best match for the approximated IFFT. Hence, it is clear that there is a need to build a cross layer design framework to achieve optimized energy and quality trade-offs for the system as a whole under supply voltage over-scaling. In this thesis, we propose a new design framework for digital wireless communication systems, which can achieve an energy-quality efficient system under given channel condition by appropriate scaling of supply voltage.

Degree

M.S.E.C.E.

Advisors

Roy, Purdue University.

Subject Area

Electrical engineering

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