What is it about?
The OFDM is a widely used modulation for wireless and wired communication systems thanks to its high spectral efficiency and robustness against frequency-selective fadings. Examples are: ADSL & VDSL, DVB-T, WiFi & LiFi, 4G to cite only a few. However, OFDM beside all its merits consumes energy because it has a statistical high Peak-to-Average Power Ratio (PAPR). GreenOFDM is a new technique borrowed from the well-known SeLected-Mapping (SLM). GreenOFDM is a disruptive SLM because with only M IFFTs it generates O(M^2) OFDM time-domain symbol candidates. By computing selectively the PAPR of the candidates in a specific order, the one that has a PAPR lower than a predetermined threshold is selected for transmission. This decreases significantly the energy consumption of both the digital and more importantly the analog macro-blocks.
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Why is it important?
Our findings show that OFDM modulation can also be useful for years battery-life of IoT objects and edge devices using Artificial Intelligence algorithms.
Perspectives
Writing this article was a great pleasure as it has co-authors with whom I have had long standing collaborations. We hope this article will engage all smart engineers and physicists to further improve the GreenOFDM, either theoretically and/or experimentally in order to eventually find it deployed in the forthcoming real-life communication systems. It is noteworthy that GreenOFDM as described in the IET's article has not been patented.
Denis Mestdagh
IEEE
Read the Original
This page is a summary of: GreenOFDM: A New Selected Mapping method for OFDM PAPR Reduction , Electronics Letters, February 2018, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/el.2017.4743.
You can read the full text:
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