International Journal of Electronics, ( ISI ), Volume (102), No (12), Year (2015-9) , Pages (2046-2061)

Title : ( Analog Implementation of Radix-2, 16-FFT Processor for OFDM Receivers: Non-linearity Behaviors and System Performance Analysis )

Authors: Nasrin Mokhtarian , Ghosheh Abed Hodtani ,

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Analog implementations of decoders have been widely studied, with promising results in terms of circuit complexity, power and speed. To attempt to integrate these decoders with other analog front-end processing blocks is an extension of analog decod- ing research. An analog FFT would be suitable for combination with an analog decoder in the making of an all-analog communication front-end for OFDM sys- tems. In this paper, the implementation of a 16-symbol Fast Fourier Transform processor based on analog CMOS current mirrors within circuit and system level is presented, and the FFT is implemented using a butterfly diagram, where each node is implemented using analog circuits. Implementation details include considera- tion of effects of transistors mismatch and inherent noises and effects of circuit non-linearity in OFDM system performance. It is shown that not only transistor inherent noises can be mea- sured but also transistors mismatch can be applied as an input-referred noise source that can be used in system and circuit level studies. Simulations of a radix-2, 16-symbol fast Fourier transform (FFT) show that proposed circuits consume very low power and impacts of noise, mismatch and non-linearity for each node of this processor are very small.

Keywords

Keywords: analog circuits; current mirrors; fast Fourier transform; mismatch; orthogonal frequency division multiplexing; quadrature Amplitude
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@article{paperid:1032560,
author = {Nasrin Mokhtarian and Abed Hodtani, Ghosheh},
title = {Analog Implementation of Radix-2, 16-FFT Processor for OFDM Receivers: Non-linearity Behaviors and System Performance Analysis},
journal = {International Journal of Electronics},
year = {2015},
volume = {102},
number = {12},
month = {September},
issn = {0020-7217},
pages = {2046--2061},
numpages = {15},
keywords = {Keywords: analog circuits; current mirrors; fast Fourier transform; mismatch; orthogonal frequency division multiplexing; quadrature Amplitude Modulation.},
}

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%0 Journal Article
%T Analog Implementation of Radix-2, 16-FFT Processor for OFDM Receivers: Non-linearity Behaviors and System Performance Analysis
%A Nasrin Mokhtarian
%A Abed Hodtani, Ghosheh
%J International Journal of Electronics
%@ 0020-7217
%D 2015

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