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Orthogonal signal-division multiplexing (OSDM) underwater acoustic communication method based on time domain oversampling

An underwater acoustic communication and oversampling technology, which is applied in ultrasonic/sonic/infrasonic transmission systems, transmission monitoring, electrical components, etc., and can solve problems such as orthogonality destruction between symbol vectors and system performance degradation.

Active Publication Date: 2019-02-05
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

However, when the OSDM system introduces Doppler distortion, the orthogonality between symbol vectors will be destroyed, resulting in Inter-Vector Interference (IVI) similar to OFDM Inter-Carrier Interference (ICI). ), the system performance is significantly degraded

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  • Orthogonal signal-division multiplexing (OSDM) underwater acoustic communication method based on time domain oversampling
  • Orthogonal signal-division multiplexing (OSDM) underwater acoustic communication method based on time domain oversampling
  • Orthogonal signal-division multiplexing (OSDM) underwater acoustic communication method based on time domain oversampling

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Embodiment Construction

[0074] The present invention will now be further described in conjunction with the embodiments and drawings:

[0075] The specific method of orthogonal signal division multiplexing underwater acoustic communication technology based on time domain oversampling is as follows: (1) A time domain oversampling OSDM system model is designed for multipath time-varying underwater acoustic channels, where each OSDM symbol vector is equivalent Ground transmission on multiple virtual sub-channels, which can make the system's appropriate internal frequency diversity gain higher; (2) The receiving end uses the zero vector and frequency shift Chu sequence for Doppler compensation and channel estimation, and the received Each vector is equalized independently to obtain an estimate of the transmitted symbol; (3) At the same time, the equalization algorithm is implemented based on the composite channel matrix decomposition, and its computational complexity is approximately linear.

[0076] The metho...

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Abstract

The invention relates to an orthogonal signal-division multiplexing (OSDM) underwater acoustic communication method based on time domain oversampling. Frequency domain diversity gain obtained throughOSDM intra-vector precoding is combined with frequency diversity gain obtained by time domain oversampling. Compared with a conventional symbol rate OSDM system, the system has the advantage that intra-vector frequency diversity gain is higher. Under the condition, each OSDM symbol vector is equivalently transmitted through a plurality of virtual channels. At a receiving end, equalization processing and multivariant receiving of each vector are realized through adoption of similar structures. According to a numerical simulation result, it is clear that compared with a conventional OSDM system,the time domain oversampling OSDM system provided by the invention has the advantage that the performance is clearly improved. Through composite channel matrix decomposition, an equalization algorithm employed by the invention has computing complexity approximate to linearity, and the time domain oversampling OSDM system provided has practical value.

Description

Technical field [0001] The invention belongs to the field of underwater acoustic communication, and relates to an orthogonal signal division multiplexing underwater acoustic communication method based on time domain oversampling, in particular to a time domain oversampling orthogonal signal division suitable for multipath time-varying underwater acoustic channels Reuse method. Background technique [0002] The underwater acoustic channel is currently recognized as one of the most challenging wireless communication media. The low transmission rate of acoustic waves (1500m / s) will cause long-term multipath delay spread, which usually spans dozens of underwater acoustic communication symbol intervals, resulting in severe inter-symbol interference (ISI) . In order to overcome this interference and achieve high-speed transmission, Orthogonal Frequency Division Multiplexing (OFDM) and its frequency domain equalization technology have been widely used in the field of underwater acoust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/391H04B13/02H04B11/00
CPCH04B11/00H04B13/02H04B17/391H04B17/3912
Inventor 韩晶张玲玲王玉洁
Owner NORTHWESTERN POLYTECHNICAL UNIV
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