Improving Massive MIMO Belief Propagation Detector with Deep Neural Network
This work addresses detection performance in massive MIMO systems, which is incremental as it modifies existing BP methods with deep learning.
The paper tackles the problem of improving belief propagation detection for massive MIMO systems by using deep neural networks to optimize correction factors, resulting in lower bit error rate and improved robustness at the same complexity level compared to state-of-the-art detectors.
In this paper, deep neural network (DNN) is utilized to improve the belief propagation (BP) detection for massive multiple-input multiple-output (MIMO) systems. A neural network architecture suitable for detection task is firstly introduced by unfolding BP algorithms. DNN MIMO detectors are then proposed based on two modified BP detectors, damped BP and max-sum BP. The correction factors in these algorithms are optimized through deep learning techniques, aiming at improved detection performance. Numerical results are presented to demonstrate the performance of the DNN detectors in comparison with various BP modifications. The neural network is trained once and can be used for multiple online detections. The results show that, compared to other state-of-the-art detectors, the DNN detectors can achieve lower bit error rate (BER) with improved robustness against various antenna configurations and channel conditions at the same level of complexity.