Active Sensing for Communications by Learning
This work addresses adaptive sensing challenges in wireless communications, offering improved performance for specific applications like beam alignment, but it is incremental as it builds on existing deep learning methods.
The paper tackles the problem of designing adaptive sensing strategies in wireless communications by proposing a deep learning framework that uses LSTM and DNNs to handle sequential observations and optimize utility functions. Numerical results show it outperforms existing adaptive and nonadaptive sensing schemes for tasks like mmWave beam alignment and reconfigurable intelligent surface sensing.
This paper proposes a deep learning approach to a class of active sensing problems in wireless communications in which an agent sequentially interacts with an environment over a predetermined number of time frames to gather information in order to perform a sensing or actuation task for maximizing some utility function. In such an active learning setting, the agent needs to design an adaptive sensing strategy sequentially based on the observations made so far. To tackle such a challenging problem in which the dimension of historical observations increases over time, we propose to use a long short-term memory (LSTM) network to exploit the temporal correlations in the sequence of observations and to map each observation to a fixed-size state information vector. We then use a deep neural network (DNN) to map the LSTM state at each time frame to the design of the next measurement step. Finally, we employ another DNN to map the final LSTM state to the desired solution. We investigate the performance of the proposed framework for adaptive channel sensing problems in wireless communications. In particular, we consider the adaptive beamforming problem for mmWave beam alignment and the adaptive reconfigurable intelligent surface sensing problem for reflection alignment. Numerical results demonstrate that the proposed deep active sensing strategy outperforms the existing adaptive or nonadaptive sensing schemes.