A BER formula of OTFS modulation with message‐passing receiver

The orthogonal time frequency space (OTFS) modulation is a promising multicarrier waveform which can have good performance in high‐mobility scenarios. Among various receivers designed for the OTFS modulation, the message‐passing (MP) receiver has received much attention which can achieve a good bit...

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Bibliographic Details
Published in:IET communications 2023-09, Vol.17 (15), p.1820-1828
Main Authors: Du, Peng, Zhang, Yuan
Format: Article
Language:English
Subjects:
Bit error rate
bit error rate (BER)
Codes
Distribution functions
Error analysis
Fourier transforms
Messages
message‐passing
Modulation
orthogonal time frequency space (OTFS)
Parameter estimation
Probability distribution
Probability distribution functions
Random variables
Selective fading
Transmitters
Waveforms
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Summary:The orthogonal time frequency space (OTFS) modulation is a promising multicarrier waveform which can have good performance in high‐mobility scenarios. Among various receivers designed for the OTFS modulation, the message‐passing (MP) receiver has received much attention which can achieve a good bit error rate (BER) performance. However, the BER performance of MP receiver is usually obtained through simulations due to the lack of corresponding BER formula in the literature. This work studies the BER formula of OTFS modulation with MP receiver over doubly selective fading channel. Specifically, equivalent signal models of the MP receiver are first defined and the expression of the corresponding signal‐noise‐ratio (SNR) is derived, then the probability distribution function of the SNR is estimated by assuming the distribution of SNR as a lognormal distribution, then the methods to estimate the parameters of the distribution function are proposed, and finally the formula for calculating the BER of the OTFS modulation with MP receiver is obtained. Simulation results verify that the proposed BER formula is accurate. This work proposes a BER formula of OTFS modulation with the message‐passing receiver over doubly‐selective fading channel. The key is to obtain the equivalent signal model of the receiver and estimate the probability distribution function of the SNR. Simulation results verify that the proposed BER formula is accurate.
ISSN:1751-8628
1751-8636
DOI:10.1049/cmu2.12656