Bayesian Over-the-Air Computation
نویسندگان
چکیده
As an important piece of the multi-tier computing architecture for future wireless networks, over-the-air computation (OAC) enables efficient function in multiple-access edge computing, where a fusion center aims to compute data distributed at devices. Existing OAC relies exclusively on maximum likelihood (ML) estimation recover arithmetic sum transmitted signals from different ML estimation, however, is much susceptible noise. In particular, misaligned there are channel misalignments among received signals, suffers severe error propagation and noise enhancement. To address these challenges, this paper puts forth Bayesian approach by letting each device transmit two pieces statistical information such that estimators can be devised tackle misalignments. Numerical simulation results verify that, 1) For aligned synchronous OAC, our linear minimum mean squared (LMMSE) estimator significantly outperforms estimator. low signal-to-noise ratio (SNR) regime, LMMSE reduces (MSE) least 6 dB; high SNR lowers floor MSE 86.4%; 2) asynchronous sum-product posteriori (SP-MAP) equal footing terms performance, better than Moreover, SP-MAP computationally efficient, complexity which grows linearly with packet length.
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ژورنال
عنوان ژورنال: IEEE Journal on Selected Areas in Communications
سال: 2023
ISSN: ['0733-8716', '1558-0008']
DOI: https://doi.org/10.1109/jsac.2022.3229428