实现智能化和更高的频谱效率：基于Faster than-Nyquist和深度学习的可变填充比传输系统
For Intelligent and Higher Spectrum Efficiency: A Variable Packing Ratio Transmission System Based on Faster-than-Nyquist and Deep Learning
摘要：
随着无线通信中各种业务的快速发展，频谱资源变得越来越宝贵。在20世纪70年代提出的比奈奎斯特更快（FTN）信令是用于提高频谱利用率的有希望的范例。本文提出了智能可变包装比（VPR）为基础的传输高频谱效率（SE）和安全性，分别。在基于深度学习（DL）的估计的帮助下，所提出的用于高SE的方案可以实现更高的容量，而对现有通信范例（例如，频谱分配或帧结构）。同时，针对基于VPR的安全传输，提出了一种动态生成方案，通过生成随机分布的位置来切换封装率，有效地避免了检测和攻击。此外，我们提出了一个简化的DL为基础的包装比估计这两种情况下，使接收机可以估计包装比没有任何带内或带外控制消息。仿真结果表明，该简化估计算法与原多分支全连接结构相比，在精度和收敛速度上几乎相同，但复杂度降低了20倍。最后，我们推导出封闭形式的SE的建议VPR传输在不同的信道。数值结果验证了推导的正确性，并展示了超越传统奈奎斯特传输的VPR方案的SE增益。
英文摘要：
With the rapid development of various services in wireless communications, spectrum resource has become increasingly valuable. Faster than Nyquist (FTN) signaling, proposed in the 1970s, is a promising paradigm for improving spectrum utilization. This paper proposes intelligent variable-packing-ratio (VPR)-based transmissions for high spectrum efficiency (SE) and security, respectively. Aided by deep learning (DL)-based estimation, the proposed scheme for high SE can achieve a higher capacity with negligible modification to existing communication paradigms (e.g., spectrum allocation or frame structure). Also, for VPR-based secure transmission, a dynamic generation scheme is proposed to produce randomly distributed positions to switch the packing ratio, which can effectively avoid detections and attacks. In addition, we propose a simplified DL-based packing ratio estimation for both of these two scenarios so that the receiver can estimate the packing ratio without any in-band or out-band control messages. Simulation results show that the proposed simplified estimation achieves nearly the same accuracy and convergence speed as the original multi-branch fully-connected structure with a complexity reduction of 20 folds. Finally, we derive the closed-form SE of the proposed VPR transmission under different channels. The numerical results validate the correctness of the derivation and demonstrate the SE gains of the VPR scheme beyond conventional Nyquist transmission.
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