Power Consumption Calculation for IEEE 802.11-23: July 2023
This document presents power consumption calculations for an active transmitter in the AMP STA, energy storage capacity requirements, and energy harvesting efficiency for IEEE 802.11-23 in July 2023.
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July 2023 doc.: IEEE 802.11-23/1232r0 Power Consumption Calculation Date: 2023-07-11 Authors: Name Joerg ROBERT Affiliations Address TU Ilmenau/ Fraunhofer IIS Phone email joerg.robert@tu- ilmenau.de clemens.korn@tu- ilmenau.de Helmholtzplatz 2, 98693 Ilmenau, Germany Clemens KORN Submission Slide 1 Joerg ROBERT, TU Ilmenau/Fraunhofer IIS
July 2023 doc.: IEEE 802.11-23/1232r0 Abstract Document 11-23/876r0 presented an approach for X-Band operation. The were questions related to the actual power consumption. This presentation shows some figures on the actual energy consumption inside the AMP STA and the required energy storage capacitor size. Submission Slide 2 Joerg ROBERT, TU Ilmenau/Fraunhofer IIS
May. 2023 doc.: IEEE 802.11-23/1232r0 Link Budget Calculation AMP-assisting STA 27dBm (500mW) 5dBi 0dBi 52dB (915MHz) -20dBm AMP STA -25dBm (0.003mW) 0dBi 5dBi 60dB (2.4GHz) -80 dBm Transmit Power Transmitter Ant. Gain. Receiver Ant. Gain Path Loss for 10m RX Power at Receiver Parameters as presented in 11-23/876r0 Minimum signal level of -20dBm at AMP STA Transmit power of 3 W for AMP STA Submission Slide 3 Joerg ROBERT, TU Ilmenau/Fraunhofer IIS
July 2023 doc.: IEEE 802.11-23/1232r0 Some Assumptions for the AMP STA 802.11b uplink waveform, 50 bytes @11Mbit/s 190 s TX duration 10 s PLL settling time 5mW power consumption when PLL [1] and/or TX is active (200 s) Main consumption is due to PLL Previous slide assumes TX power of only 3 W Minimize TX on-air time to save energy 1 Joule for one uplink packet Submission Slide 4 Joerg ROBERT, TU Ilmenau/Fraunhofer IIS
July 2023 doc.: IEEE 802.11-23/1232r0 Energy Harvesting Conversion efficiency 10% of the harvester [2] Minimum reception level of -20dBm Minimum power of 1 W available for the harvester 10 W 1 s to harvest 1 Joule @ -20 dBm 0.1 s to harvest 1 Joule @ -10 dBm Submission Slide 5 Joerg ROBERT, TU Ilmenau/Fraunhofer IIS
July 2023 doc.: IEEE 802.11-23/1232r0 Required Energy Storage Capacity Stored energy on capacitor is given by ? =? ???? 50% of the energy is actually usable, U=2V Required capacitor size of C=1 F to store 1 J Submission Slide 6 Joerg ROBERT, TU Ilmenau/Fraunhofer IIS
July 2023 doc.: IEEE 802.11-23/1232r0 Conclusions This presentation calculated the required energy for an active transmitter in the AMP STA The system requires approx. 1 J per packet The given numbers can be harvested from the field in a realistic timeframe Only a tiny capacitor is required to store the energy Submission Slide 7 Joerg ROBERT, TU Ilmenau/Fraunhofer IIS
July 2023 doc.: IEEE 802.11-23/1232r0 Literature [1] K. -F. Un et al., "A 0.12-mm2 1.2-to-2.4-mW 1.3-to-2.65-GHz Fractional- N Bang-Bang Digital PLL With 8- s Settling Time for Multi-ISM-Band ULP Radios," in IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 66, no. 9, pp. 3307-3316, Sept. 2019 [2] A. Collado and A. Georgiadis, "Conformal Hybrid Solar and Electromagnetic (EM) Energy Harvesting Rectenna," in IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 60, no. 8, pp. 2225-2234, Aug. 2013 Submission Slide 8 Joerg ROBERT, TU Ilmenau/Fraunhofer IIS
