Chen Wenxuan, Liu Yunpeng, Tang Xiaobin, Mu Junxu, Lai Sheng
Opt Express. 2021 Feb 1;29(3):3596-3608. doi: 10.1364/OE.415291.
We experimentally demonstrate an improved orthogonal frequency division multiplexing (OFDM) into the pulse width modulation (PWM) scheme for the X-ray communication (XCOM). The scheme is insensitive to the nonlinearity of the grid-controlled X-ray tube with switching 'on' and 'off' between two points. The dependence of this system's bit-error-rate (BER) performances on the data rates and the working parameters including the anode voltage and filament current of the grid-controlled X-ray tube are studied. The OFDM-PWM scheme reaches the data rate of 360 kbps at a BER of the forward error correction threshold of 3.8 × 10 over a 5 cm air channel. In addition, an experiment aided by density-based spatial clustering of applications with noise nonlinear compensation is carried out, and the results demonstrate the improvements in Q-factor by 0.62 dB.
我们通过实验证明了一种用于X射线通信（XCOM）的、改进的正交频分复用（OFDM）到脉宽调制（PWM）的方案。该方案对栅控X射线管在两点之间“开”和“关”切换时的非线性不敏感。研究了该系统的误码率（BER）性能对数据速率以及包括栅控X射线管阳极电压和灯丝电流在内的工作参数的依赖性。在5厘米空气通道上，OFDM - PWM方案在前向纠错阈值BER为3.8×10时达到了360 kbps的数据速率。此外，还进行了一项借助基于密度的噪声非线性补偿应用空间聚类的实验，结果表明品质因数提高了0.62 dB。
