针对太赫兹频段高速移动场景,提出了一种参考信号方案——增强型离散傅里叶变换扩展正交频分复用(E DFT-s-OFDM)DMRS:将具有循环前缀(CP)和循环后缀(CS)的参考信号序列分割为首部和尾部参考信号序列,然后分别嵌入每个OFDM符号的尾部和首部.这种方案的优点在于,前一个OFDM符号的尾部和后一个OFDM符号的首部构成一个完整的参考信号序列,从而允许接收端在每个OFDM符号间隔内都能进行信道估计,提高了信道估计的精度和实时性.此外,相邻OFDM符号的首部和尾部参考信号序列相同,从而省去了每个OFDM符号的传统循环前缀(CP),提高了频谱效率.仿真结果表明,在太赫兹频段高速移动场景下,与5G NR DFT-s-OFDM波形的DMRS方案相比,该方案的信道估计更精确,通信系统的频谱效率更高.
Research on reference signal scheme for high-mobility scenarios in the Terahertz frequency band
A novel reference signal scheme,E DFT-s-OFDM DMRS was proposed for high-mobility scenarios in the Terahertz band. The proposed scheme involved segmenting the reference signal sequence with cyclic prefix and cyclic suffix into a head and tail reference signal sequence. These sequences were then embedded into the tail and head of each OFDM symbol,respectively. The scheme had the advantage of using a complete reference signal sequence formed by the tail of the preceding OFDM symbol and the head of the following OFDM symbol. This allowed the re-ceiver to perform channel estimation in each OFDM symbol interval,improving the accuracy and real-time perfor-mance of channel estimation. Furthermore,adjacent OFDM symbols share identical head and tail reference signal se-quences,eliminating the traditional cyclic prefix for each OFDM symbol and improving spectral efficiency. Simula-tion results demonstrate that this scheme provides more precise channel estimation and greater spectral efficiency than DMRS scheme with 5G NR DFT-s-OFDM waveform for high-mobility scenarios in the Terahertz band.
Terahertz frequency bandhigh-mobility scenarioreference signalchannel estimationspectrum efficiency
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维普
