HybridDeepRx: Deep Learning Receiver for High-EVM Signals
This addresses the problem of reliable communication under high distortion for wireless network operators, but it is incremental as it builds on existing ML receiver approaches.
The paper tackled demodulating OFDM signals with high nonlinear distortion by proposing a deep learning-based convolutional neural network receiver, which outperformed classical linear and existing ML receivers, especially at high error vector magnitude relative to modulation order, improving terminal power-efficiency and network coverage.
In this paper, we propose a machine learning (ML) based physical layer receiver solution for demodulating OFDM signals that are subject to a high level of nonlinear distortion. Specifically, a novel deep learning based convolutional neural network receiver is devised, containing layers in both time- and frequency domains, allowing to demodulate and decode the transmitted bits reliably despite the high error vector magnitude (EVM) in the transmit signal. Extensive set of numerical results is provided, in the context of 5G NR uplink incorporating also measured terminal power amplifier characteristics. The obtained results show that the proposed receiver system is able to clearly outperform classical linear receivers as well as existing ML receiver approaches, especially when the EVM is high in comparison with modulation order. The proposed ML receiver can thus facilitate pushing the terminal power amplifier (PA) systems deeper into saturation, and thereon improve the terminal power-efficiency, radiated power and network coverage.