TY - GEN
T1 - A low-complexity approximate message passing equalizer for OTFS system
AU - Zhang, Yang
AU - Zhang, Qunfei
AU - Zhang, Lingling
AU - He, Chengbing
AU - Tian, Xinyuan
N1 - Publisher Copyright:
© 2021 IEEE.
PY - 2021/7/28
Y1 - 2021/7/28
N2 - The orthogonal time frequency space (OTFS) modulation has emerged as a potential candidate modulation scheme for high mobility wireless communications. However, OTFS may experience significant inter-Doppler interference (IDI) and inter-symbol interference (ISI) occur in the receiver. To jointly combat both interferences, we propose an efficient improved approximate message passing (AMP) equalizer for OTFS transmission over delay-Doppler channels in this paper. Specifically, a decoupling operation can be performed for joint interference cancellation, and the sparse feature of equivalent channel matrix is utilized in delay-Doppler domain. Then, the posterior mean and variance estimates of the transmitted symbol is reconstructed by the denoising step. Furthermore, a threshold-based convergence scheme is proposed with the purpose of trade-off the computational complexity and performance of the OTFS system. Simulation results demonstrate that the proposed improved AMP equalizer exhibits a better bit error rate (BER) performance with a reduced complexity compared to its conventional counterparts.
AB - The orthogonal time frequency space (OTFS) modulation has emerged as a potential candidate modulation scheme for high mobility wireless communications. However, OTFS may experience significant inter-Doppler interference (IDI) and inter-symbol interference (ISI) occur in the receiver. To jointly combat both interferences, we propose an efficient improved approximate message passing (AMP) equalizer for OTFS transmission over delay-Doppler channels in this paper. Specifically, a decoupling operation can be performed for joint interference cancellation, and the sparse feature of equivalent channel matrix is utilized in delay-Doppler domain. Then, the posterior mean and variance estimates of the transmitted symbol is reconstructed by the denoising step. Furthermore, a threshold-based convergence scheme is proposed with the purpose of trade-off the computational complexity and performance of the OTFS system. Simulation results demonstrate that the proposed improved AMP equalizer exhibits a better bit error rate (BER) performance with a reduced complexity compared to its conventional counterparts.
KW - Approximate message passing
KW - Delay-Doppler channels
KW - OTFS
UR - http://www.scopus.com/inward/record.url?scp=85116425364&partnerID=8YFLogxK
U2 - 10.1109/ICCCWorkshops52231.2021.9538883
DO - 10.1109/ICCCWorkshops52231.2021.9538883
M3 - 会议稿件
AN - SCOPUS:85116425364
T3 - 2021 IEEE/CIC International Conference on Communications in China, ICCC Workshops 2021
SP - 449
EP - 454
BT - 2021 IEEE/CIC International Conference on Communications in China, ICCC Workshops 2021
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2021 IEEE/CIC International Conference on Communications in China, ICCC Workshops 2021
Y2 - 28 July 2021 through 30 July 2021
ER -