Underwater acoustic communication based on virtual time reversal and sweep-spread carrier

Li, Wencong; Yuan, Fei; Chen, Ke-Yu; Zhu, Yan

doi:10.1109/oceansap.2016.7485563

Cited by 1 publication

(1 citation statement)

References 14 publications

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“…The VTRM system design is shown in Fig. 8; first, the estimated channel impulse response h ′ (t) is time-reversed h ′ (−t) , and then it is convolved with the received signal [42]. Let x r (t) be the transmit signal passed through the UWA channel can be given as Then after virtual time reversal, the received signal can be expressed as…”

Section: Virtual Time-reversal Mirror Methodsmentioning

confidence: 99%

M-ary nonlinear sine chirp spread spectrum for underwater acoustic communication based on virtual time-reversal mirror method

Liu¹,

Zuberi²,

Farooq³

et al. 2021

J Wireless Com Network

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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.

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Section: Virtual Time-reversal Mirror Methodsmentioning

confidence: 99%