Expanding Over-the-Air Computation With Frequency Modulations
Por:
Martinez-Gost M., Pérez-Neira A., Lagunas M.A.
Publicada:
1 nov 2025
Resumen:
In this study we introduce Logarithmic Frequency Shift Keying (Log-FSK), a novel frequency modulation for over-the-air computation (AirComp). Log-FSK leverages non-linear signal processing to produce AirComp in the frequency domain, this is, the maximum frequency of the received signal corresponds to the sum of the individual transmitted frequencies. The demodulation procedure relies on the inverse Discrete Cosine Transform (DCT) and the extraction of the maximum frequency component. Log-FSK enables the computation of functions beyond the sum by incorporating nomographic function representation. Furthermore, unlike existing AirComp modulations, Log-FSK allows to compute several functions in a single transmission. We evaluate the capabilities of the scheme in an additive white Gaussian noise (AWGN) and flat-fading channels. To demonstrate its practicality, we present specific applications and experimental results showcasing the effectiveness of Log-FSK AirComp within linear Wireless Sensor Networks (WSN). Our numerical results show that Log-FSK outperform linear analog modulations in terms of MSE and power consumption.
Filiaciones:
Martinez-Gost M.:
Centre Tecnològic de Telecomunicacions de Catalunya, Spain
Universitat Politècnica de Catalunya, Dept. of Signal Theory and Communications, Spain
Pérez-Neira A.:
Centre Tecnològic de Telecomunicacions de Catalunya, Spain
Universitat Politècnica de Catalunya, Dept. of Signal Theory and Communications, Spain
ICREA Acadèmia, Spain
Lagunas M.A.:
Centre Tecnològic de Telecomunicacions de Catalunya, Spain
Green Submitted, Green Accepted, All Open Access; Green Open Access
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