The “magnetic window” is considered to be an effective technique for alleviating a vehicle’s atmospheric reentry blackout, whereas the dynamic variation characteristic of the plasma sheath is critical for the vehicle’s communication. In this article, the effects of dynamic plasma sheath on electromagnetic wave propagation and the bit error rate (BER) of two typical modulation signals under an external magnetic field are investigated. First, the hybrid matrix method is used to calculate the transmission coefficients of right-handed circularly polarized (RHCP) waves with different magnetic fields and plasma electron density fluctuation. Then, the average BER of two typical modulations signals, namely M-ary phase-shift keying (MPSK) and noncoherent M-ary frequency shift keying modulation (NC-MFSK) is numerically simulated based on the magnetized plasma sheath channel response. The results show that the magnitude in dB scale and phase of the RHCP transmission coefficient follow Gaussian distribution when the probability density function of the electron density is a Gaussian distribution. The BER performance of binary phase-shift keying (BPSK) and NC-MFSK is relevant to the incident wave frequency, the plasma stopband, and the intensity of electron density variation. Owing to the insensitivity of phase jitter, the NC-8FSK has a better performance than BPSK, followed by NC-4FSK and NC-2FSK.

中文翻译：

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外磁场下动态等离子体鞘对电磁波传播和误码率的影响

“磁窗”被认为是缓解飞行器再入大气断电的有效技术，而等离子体鞘的动态变化特性对飞行器的通信至关重要。本文研究了动态等离子体鞘层对电磁波传播的影响以及外部磁场下两种典型调制信号的误码率（BER）。首先，利用混合矩阵法计算了不同磁场和等离子体电子密度波动的右旋圆极化（RHCP）波的透射系数。然后，两个典型调制信号的平均 BER，即 M-ary 相移键控 (MPSK) 和非相干 M-ary 频移键控调制 (NC-MFSK) 基于磁化等离子体鞘层通道响应进行数值模拟。结果表明，当电子密度的概率密度函数为高斯分布时，RHCP传输系数的dB尺度大小和相位服从高斯分布。二进制相移键控 (BPSK) 和 NC-MFSK 的 BER 性能与入射波频率、等离子体阻带和电子密度变化的强度有关。由于对相位抖动不敏感，NC-8FSK的性能优于BPSK，其次是NC-4FSK和NC-2FSK。结果表明，当电子密度的概率密度函数为高斯分布时，RHCP传输系数的dB尺度大小和相位服从高斯分布。二进制相移键控 (BPSK) 和 NC-MFSK 的 BER 性能与入射波频率、等离子体阻带和电子密度变化的强度有关。由于对相位抖动不敏感，NC-8FSK的性能优于BPSK，其次是NC-4FSK和NC-2FSK。结果表明，当电子密度的概率密度函数为高斯分布时，RHCP传输系数的dB尺度大小和相位服从高斯分布。二进制相移键控 (BPSK) 和 NC-MFSK 的 BER 性能与入射波频率、等离子体阻带和电子密度变化的强度有关。由于对相位抖动不敏感，NC-8FSK的性能优于BPSK，其次是NC-4FSK和NC-2FSK。