Channel Estimation Based on Machine Learning Paradigm for Spatial Modulation OFDM
This work addresses channel estimation for wireless communication systems, but it appears incremental as it applies existing machine learning techniques to a specific modulation scheme.
The paper tackles channel estimation in spatial modulation OFDM systems by integrating deep neural networks for end-to-end data detection over Rayleigh fading channels, showing significant advantages over classical methods when pilot overhead and cyclic prefix are reduced, with an ensemble network further improving generalization and performance.
In this paper, deep neural network (DNN) is integrated with spatial modulation-orthogonal frequency division multiplexing (SM-OFDM) technique for end-to-end data detection over Rayleigh fading channel. This proposed system directly demodulates the received symbols, leaving the channel estimation done only implicitly. Furthermore, an ensemble network is also proposed for this system. Simulation results show that the proposed DNN detection scheme has a significant advantage over classical methods when the pilot overhead and cyclic prefix (CP) are reduced, owing to its ability to learn and adjust to complicated channel conditions. Finally, the ensemble network is shown to improve the generalization of the proposed scheme, while also showing a slight improvement in its performance.