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M-ary nonlinear sine chirp spread spectrum for underwater acoustic communication based on virtual time-reversal mirror method
EURASIP Journal on Wireless Communications and Networking ( IF 2.6 ) Pub Date : 2021-05-01 , DOI: 10.1186/s13638-021-01995-3
Songzuo Liu , Habib Hussain Zuberi , Yi Lou , Muhmmad Bilal Farooq , Shahabuddin Shaikh , Waleed Raza

Linear chirp spread spectrum technique is widely used in underwater acoustic communication because of their resilience to high multipath and Doppler shift. Linear frequency modulated signal requires a high spreading factor to nearly reach orthogonality between two pairs of signals. On the other hand, nonlinear chirp spread spectrum signals can provide orthogonality at a low spreading factor. As a result, it improves spectral efficiency and is more insensitive to Doppler spread than the linear counterpart. To achieve a higher data rate, we propose two variants (half cycle sine and full cycle sine) of the M-ary nonlinear sine chirp spread spectrum technique based on virtual time-reversal mirror (VTRM). The proposed scheme uses different frequency bands to transmit chirp, and VTRM is used to improve the bit error rate due to high multipath. Its superior Doppler sensitivity makes it suitable for underwater acoustic communication. Furthermore, the proposed method uses a simple, low-power bank of matched filters; thus, it reduces the overall system complexity. Simulations are performed in different underwater acoustic channels to verify the robustness of the proposed scheme.



中文翻译:

基于虚拟时间倒转镜法的水声通信M元非线性正弦线性调频扩频

线性线性调频扩频技术因其对高多径和多普勒频移的适应性而广泛用于水下声通信。线性调频信号需要很高的扩展因子,才能在两对信号之间几乎达到正交性。另一方面,非线性线性调频扩频信号可以以低扩频因子提供正交性。结果,它提高了光谱效率,并且比线性对应物对多普勒扩展更不敏感。为了获得更高的数据速率,我们提出了基于虚拟时间反转镜(VTRM)的M元非线性正弦线性调频扩频技术的两个变体(半周期正弦和全周期正弦)。所提出的方案使用不同的频带来传输线性调频信号,并且由于高多径,VTRM用于提高误码率。其出色的多普勒灵敏度使其适用于水下声学通信。此外,所提出的方法使用了一个简单的低功耗匹配滤波器组。因此,它降低了整个系统的复杂性。在不同的水下声学通道中进行了仿真,以验证所提出方案的鲁棒性。

更新日期:2021-05-02
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