TY - GEN
T1 - An Improved MRC-Rake Symbol Detector for OTFS Modulation Using Expectation Cancellation
AU - Zhang, Haojian
AU - Lv, Minghui
AU - Li, Jianing
AU - Zhang, Tingting
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - MRC-Rake detector has shown a great advantage in the low-complexity OTFS symbol detection over the probability graph based detectors, like message passing and expectation propagation (EP) detectors. However, these probabilistic detectors provide us an idea of soft-interference cancellation to incrementally improve the MRC-Rake detector. In this paper, it is first proposed to use the modulation symbol expectation cancellation to mitigate the error propagations during interference cancellations in the MRC-Rake detector. We calculate the symbol expectation using the estimated log-likelihood ratios (LLRs) of information bits. To calculate the LLRs, a simple approach to estimate the equalized symbol gain and variance is also presented. Numerical results show that the proposed incremental improvement achieves faster convergence and better error rate over the original MRC-Rake detector and EP detector, especially when high-order QAMs are adopted.
AB - MRC-Rake detector has shown a great advantage in the low-complexity OTFS symbol detection over the probability graph based detectors, like message passing and expectation propagation (EP) detectors. However, these probabilistic detectors provide us an idea of soft-interference cancellation to incrementally improve the MRC-Rake detector. In this paper, it is first proposed to use the modulation symbol expectation cancellation to mitigate the error propagations during interference cancellations in the MRC-Rake detector. We calculate the symbol expectation using the estimated log-likelihood ratios (LLRs) of information bits. To calculate the LLRs, a simple approach to estimate the equalized symbol gain and variance is also presented. Numerical results show that the proposed incremental improvement achieves faster convergence and better error rate over the original MRC-Rake detector and EP detector, especially when high-order QAMs are adopted.
KW - Orthogonal time frequency space
KW - maximal ratio combining
KW - soft information
KW - symbol detection
UR - https://www.scopus.com/pages/publications/85159785308
U2 - 10.1109/WCNC55385.2023.10118810
DO - 10.1109/WCNC55385.2023.10118810
M3 - 会议稿件
AN - SCOPUS:85159785308
T3 - IEEE Wireless Communications and Networking Conference, WCNC
BT - 2023 IEEE Wireless Communications and Networking Conference, WCNC 2023 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2023 IEEE Wireless Communications and Networking Conference, WCNC 2023
Y2 - 26 March 2023 through 29 March 2023
ER -