Abstract
In recent years, Faster-than-Nyquist (FTN) transmission has been regarded as one of the key technologies for future 6G due to its advantages in high spectrum efficiency. However, as a price to improve the spectrum efficiency, the FTN system introduces inter-symbol interference (ISI) at the transmitting end, whicheads to a serious deterioration in the performance of traditional receiving algorithms under high compression rates and harsh channel environments. The data-driven detection algorithm has performance advantages for the detection of high compression rate FTN signaling, but the current related work is mainly focused on the application in the Additive White Gaussian Noise (AWGN) channel. In this article, for FTN signaling in multipath channels, a data and model-driven joint detection algorithm, i.e., DMD-JD algorithm is proposed. This algorithm first uses the traditional MMSE or ZFinear equalizer to complete the channel equalization, and then processes the serious ISI introduced by FTN through the deepearning network based on CNN or LSTM, thereby effectively avoiding the problem of insufficient generalization of the deepearning algorithm in different channel scenarios. The simulation results show that in multipath channels, the performance of the proposed DMD-JD algorithm is better than that of purely model-based or data-driven algorithms; in addition, the deepearning network trained based on a single channel model can be well adapted to FTN signal detection under other channel models, thereby improving the engineering practicability of the FTN signal detection algorithm based on deepearning.
Highlights
With the development of mobile multimedia services such as high-definition video and XR, mobile communication systems have put forward higher and higher requirements for transmission rates
Research on FTN has mainly focused on model-driven detection algorithms, but for FTN signaling with higher compression rates, whether it isinear detection algorithms based on MMSE or ZF, or non-linear detection algorithms such as maximum a posteriori (MAP) or BCJR, the performance is not ideal, and theatter’s implementation complexity is even very high
We propose a DMD-JD detection algorithm to solve the problem of FTN signal detection in time-varying multipath channels
Summary
With the development of mobile multimedia services such as high-definition video and XR, mobile communication systems have put forward higher and higher requirements for transmission rates. FTN realizes the compression of the transmitted signal in the time domain and the frequency domain by introducing a certain amount of ISI at the transmitting end in advance [2,3,4,5], so as to obtain higher spectral efficiency than traditional orthogonal transmission technology. Research on FTN has mainly focused on model-driven detection algorithms, but for FTN signaling with higher compression rates, whether it isinear detection algorithms based on MMSE or ZF, or non-linear detection algorithms such as MAP or BCJR, the performance is not ideal, and theatter’s implementation complexity is even very high. Preliminary research results show that under the condition of a high compression rate, the performance of the FTN signal detection algorithm based on deepearning is better than the traditional model-driven algorithm.
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