Linearization of Terahertz Transmitter Based on Low Sampling Rate DAC and ADC

XIAO Shanghui; LIU Jian; HU Bo; ZHANG Mengyao; QUAN Xin; XU Qiang; PAN Wensheng; LIU Ying; SHAO Shihai; TANG Youxi

doi:10.11999/JEIT211304

Volume 45 Issue 2

Feb. 2023

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Article Navigation > Journal of Electronics & Information Technology > 2023 > 45(2): 718-724

XIAO Shanghui, LIU Jian, HU Bo, ZHANG Mengyao, QUAN Xin, XU Qiang, PAN Wensheng, LIU Ying, SHAO Shihai, TANG Youxi. Linearization of Terahertz Transmitter Based on Low Sampling Rate DAC and ADC[J]. Journal of Electronics & Information Technology, 2023, 45(2): 718-724. doi: 10.11999/JEIT211304

Citation:

XIAO Shanghui, LIU Jian, HU Bo, ZHANG Mengyao, QUAN Xin, XU Qiang, PAN Wensheng, LIU Ying, SHAO Shihai, TANG Youxi. Linearization of Terahertz Transmitter Based on Low Sampling Rate DAC and ADC[J]. Journal of Electronics & Information Technology, 2023, 45(2): 718-724. doi: 10.11999/JEIT211304

Citation:

XIAO Shanghui, LIU Jian, HU Bo, ZHANG Mengyao, QUAN Xin, XU Qiang, PAN Wensheng, LIU Ying, SHAO Shihai, TANG Youxi. Linearization of Terahertz Transmitter Based on Low Sampling Rate DAC and ADC[J]. Journal of Electronics & Information Technology, 2023, 45(2): 718-724. doi: 10.11999/JEIT211304

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Linearization of Terahertz Transmitter Based on Low Sampling Rate DAC and ADC

doi: 10.11999/JEIT211304

1.
National key Laboratory of Science and Technology on Communications, University of Electronic Science and Technology of China, Chengdu 611731, China
2.
Unit 96901, PLA, Beijing 100094, China
3.
School of Information Science and Technology, Southwest Jiaotong University, Chengdu 611756, China

Funds: The National Natural Science Foundation of China (62071094, 61901396)

Received Date: 2021-11-22
Accepted Date: 2022-03-03
Rev Recd Date: 2022-02-23

Available Online: 2022-03-07

Publish Date: 2023-02-07

Abstract

Abstract

TeraHertz (THz) with high frequency and large bandwidth is an advantageous potential wireless spectrum resource in Sixth Generation (6G) mobile communication. However, the nonlinear distortion of THz devices limits the power conversion efficiency and the communication transmission distance. If traditional Digital Pre-Distortion (DPD) technology is used for non-linear correction, the sampling rate of the Digital-to-Analog Converter (DAC) and Analog-to-Digital Converter (ADC) is usually required to reach 5 times the signal bandwidth, which is difficult to apply to the THz frequency band. Therefore, in this paper, a digital correction method is proposed to correct the nonlinearity of the THz transmitter using the low-rate DAC and ADC. This method is mainly divided into three steps: Firstly, the observation data obtained by the low sampling rate ADC is used, and the high sampling rate observation signal with limited bandwidth is recovered by up-sampling. At this time, the signal sampling rate is 5 times the signal bandwidth, which can effectively characterize the 5th order nonlinear distortion; Then the DPD model with limited bandwidth is established to extract the DPD correction coefficient; Finally, the corrected signal is down-sampled to the DAC to correct the nonlinear distortion of the transmitter channel. The simulation results show that when DAC and ADC work at the sampling rate of 1.25 times the baseband signal rate, for a 64-QAM modulated signal, the Error Vector Magnitude (EVM) can be reduced from 8.46% to 2.27%. Therefore, modulation schemes with higher spectrum efficiency can be adopted in THz communications.
- Analog-to-Digital Converter(ADC),
- TeraHertz(THz),
- Power amplifier,
- Digital Pre-Distortion(DPD)

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References(19)

References

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