TY - GEN
T1 - Power Allocation for OTFS-based AirComp System with Robust Precoding
AU - Zhou, Dongkai
AU - Wang, Siqiang
AU - Guo, Jing
AU - Zheng, Zhong
AU - Wang, Weihao
AU - Fei, Zesong
AU - Wang, Xinyi
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - In this work, we consider a high-mobility AirComp scenario, where orthogonal time frequency space (OTFS) modulation is employed to eliminate the effects of high-mobility channels. Specifically, firstly, a two-stage transmission scheme is developed for the considered system. The estimated channel in the first stage is used to design the minimum mean square error precoder utilized for data transmission in the second stage for the current frame. To further enhance the computation accuracy, the estimated channel is used for the power allocation between the pilot symbol and data symbols for the next frame. Therein, we derive the normalized mean square error (NMSE) by taking into account the imperfect channel estimation and then find the optimal power allocation which minimizes the computation NMSE under the total power constraint via the interior point method. The simulation results show that, compared to the benchmark schemes (i.e., the non-robust precoder and the robust precoder without power allocation), the proposed scheme can effectively improve the computation accuracy of the AirComp system.
AB - In this work, we consider a high-mobility AirComp scenario, where orthogonal time frequency space (OTFS) modulation is employed to eliminate the effects of high-mobility channels. Specifically, firstly, a two-stage transmission scheme is developed for the considered system. The estimated channel in the first stage is used to design the minimum mean square error precoder utilized for data transmission in the second stage for the current frame. To further enhance the computation accuracy, the estimated channel is used for the power allocation between the pilot symbol and data symbols for the next frame. Therein, we derive the normalized mean square error (NMSE) by taking into account the imperfect channel estimation and then find the optimal power allocation which minimizes the computation NMSE under the total power constraint via the interior point method. The simulation results show that, compared to the benchmark schemes (i.e., the non-robust precoder and the robust precoder without power allocation), the proposed scheme can effectively improve the computation accuracy of the AirComp system.
KW - Over-the-air computation
KW - imperfect channel estimation
KW - orthogonal time frequency space
KW - power allocation
UR - https://www.scopus.com/pages/publications/85183461121
U2 - 10.1109/ISCIT57293.2023.10376117
DO - 10.1109/ISCIT57293.2023.10376117
M3 - Conference contribution
AN - SCOPUS:85183461121
T3 - 22nd International Symposium on Communications and Information Technologies, ISCIT 2023
SP - 19
EP - 24
BT - 22nd International Symposium on Communications and Information Technologies, ISCIT 2023
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 22nd International Symposium on Communications and Information Technologies, ISCIT 2023
Y2 - 16 October 2023 through 18 October 2023
ER -