Zhuo Xinran, Pan Jianxiong, Wang Huwei, Li Xiangming, Ye Neng
School of Cyberspace Science and Technology, Beijing Institute of Technology, Beijing 100081, China.
Science and Technology on Communication Networks Laboratory, Shijiazhuang 050081, China.
Sensors (Basel). 2022 Jun 29;22(13):4907. doi: 10.3390/s22134907.
High frequency wireless communication aims to provide ultra high-speed transmissions for various application scenarios. The waveform design for high frequency communication is challenging due to the requirements for high spectrum efficiency, as well as good hardware compatibility. With high flexibility and low peak-to-average power ratio (PAPR), discrete Fourier transformation spreading-based orthogonal frequency division multiplexing (DFT-s-OFDM) can be a promising candidate waveform. To further enhance the spectral efficiency, we integrate faster-than-Nyquist (FTN) signaling in DFT-s-OFDM, and find that the PAPR performance can also be improved. While FTN can introduce increased inter-symbol interference (ISI), in this paper, we deploy an isotropic orthogonal transform algorithm (IOTA) filter for FTN-enhanced DFT-s-OFDM, where the compact time-frequency structure of the IOTA filter can significantly reduce the ISI. Simulation results show that the proposed waveform is capable of achieving good performance in PAPR, bit error rate (BER) and throughput, simultaneously, with 3.5 dB gain in PAPR and 50% gain in throughput.
高频无线通信旨在为各种应用场景提供超高速传输。由于对高频谱效率以及良好硬件兼容性的要求，高频通信的波形设计具有挑战性。离散傅里叶变换扩频正交频分复用（DFT-s-OFDM）具有高灵活性和低峰均功率比（PAPR），可以成为一种很有前景的候选波形。为了进一步提高频谱效率，我们在DFT-s-OFDM中集成了快于奈奎斯特（FTN）信号，发现PAPR性能也可以得到改善。虽然FTN会引入增加的符号间干扰（ISI），但在本文中，我们为FTN增强的DFT-s-OFDM部署了各向同性正交变换算法（IOTA）滤波器，其中IOTA滤波器紧凑的时频结构可以显著降低ISI。仿真结果表明，所提出的波形能够在PAPR、误码率（BER）和吞吐量方面同时实现良好性能，PAPR增益为3.5 dB，吞吐量增益为50%。
