论文标题
结合深度学习和线性处理以进行调制分类和符号解码
Combining Deep Learning and Linear Processing for Modulation Classification and Symbol Decoding
论文作者
论文摘要
最近,深度学习已应用于无线通信中的许多问题,包括调制分类和符号解码。许多现有的端到端学习方法表现出对频率和时机误差等信号扭曲的鲁棒性,并且在足够的训练中超过了经典信号处理技术。但是,深度学习方法通常需要数十万个浮点操作来进行推理,这是比经典信号处理方法高的数量级,因此对于长序列而言并不能很好地扩展。此外,它们通常是一个黑匣子,并且没有了解其最终输出的获得方式,因此无法与现有方法集成在一起。在本文中,我们提出了一种新型的神经网络体系结构,该结构将深度学习与接收器通常进行的线性信号处理相结合,以实现关节调制分类和符号恢复。提出的方法通过学习和纠正信号扭曲(如载体频率偏移量和线性处理淡出)来估计信号参数。使用这种混合方法,我们利用深度学习的力量,同时保留长序列的常规接收器处理技术的效率。所提出的混合方法在信号失真估计中提供了良好的准确性,从而在符号错误率方面导致有希望的结果。为了调制分类的精度,它的表现优于许多最先进的深度学习网络。
Deep learning has been recently applied to many problems in wireless communications including modulation classification and symbol decoding. Many of the existing end-to-end learning approaches demonstrated robustness to signal distortions like frequency and timing errors, and outperformed classical signal processing techniques with sufficient training. However, deep learning approaches typically require hundreds of thousands of floating points operations for inference, which is orders of magnitude higher than classical signal processing approaches and thus do not scale well for long sequences. Additionally, they typically operate as a black box and without insight on how their final output was obtained, they can't be integrated with existing approaches. In this paper, we propose a novel neural network architecture that combines deep learning with linear signal processing typically done at the receiver to realize joint modulation classification and symbol recovery. The proposed method estimates signal parameters by learning and corrects signal distortions like carrier frequency offset and multipath fading by linear processing. Using this hybrid approach, we leverage the power of deep learning while retaining the efficiency of conventional receiver processing techniques for long sequences. The proposed hybrid approach provides good accuracy in signal distortion estimation leading to promising results in terms of symbol error rate. For modulation classification accuracy, it outperforms many state of the art deep learning networks.