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Multi-user underwater acoustic communication method based on cyclic shift keying spread spectrum modulation

A technology of underwater acoustic communication and spread spectrum modulation, which is applied in the direction of forward error control, digital transmission system, electrical components, etc., can solve the problems of low user communication rate and few accessible users, so as to improve the signal-to-interference ratio, The effect of increasing the number of users and improving the detection performance of the system

Active Publication Date: 2019-10-11
DALIAN UNIV OF TECH
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the current multi-user underwater acoustic communication system, there are few accessible users and the communication rate of each user is low.

Method used

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  • Multi-user underwater acoustic communication method based on cyclic shift keying spread spectrum modulation
  • Multi-user underwater acoustic communication method based on cyclic shift keying spread spectrum modulation
  • Multi-user underwater acoustic communication method based on cyclic shift keying spread spectrum modulation

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Embodiment Construction

[0045] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0046] The present invention only involves the baseband modulation stage in the communication system, so this part of the method is emphatically described, and the content of the carrier modulation and demodulation stage is ignored.

[0047] The transmitter structure is as figure 1 shown. Assuming that the number of users in the system is M, for the mth (m=1, 2, 3...M) user, its transmitter is mainly composed of 5 modules: channel encoder, bit interleaver π m (used to disperse the concentrated burst errors), CSK modulator, chip interleaver Π m (used to distinguish users) and carrier modulators. The following uses the specific implementation manner of the transmitting end of the mth user as an example for description.

[0048] The specific implementation of the transmitter includes the following sub-steps:

[0049] T1. Information data b of...

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Abstract

The invention belongs to the technical field of underwater acoustic communication, and particularly relates to a multi-user underwater acoustic communication method based on cyclic shift keying spreadspectrum modulation. The method comprises the following steps: step 1, enabling a transmitting end to interleave cm by utilizing a bit interleaver pi m of an mth user, then carrying out CSK modulation to improve the communication rate, and then carrying out interleaving to distinguish the users; step 2, transmitting the data after carrier modulation by using an underwater acoustic communication transmitter; and step 3, enabling a receiving end to perform passive time reversal processing on the multiple paths of preprocessed receiving signals so as to compress the channel and improve the signal to interference ratio. Then, a CSK soft demodulation mode is adopted so that CSK modulation and a traditional IDMA iterative demodulation system are perfectly combined. The detection performance ofthe system can be effectively improved. The communication rate of each user can be effectively improved, and meanwhile, the number of users can be increased.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic communication, and in particular relates to a multi-user underwater acoustic communication method based on cyclic shift keying spread spectrum modulation. Background technique [0002] With the continuous expansion of the demand for underwater communication networks in ocean development, underwater acoustic communication has become a research hotspot in the current ocean field. However, the characteristics of underwater acoustic channel, such as long delay spread, limited bandwidth, fast time-varying and high background noise, also limit the development of underwater acoustic communication. For multi-user underwater acoustic communication systems, the influence of channel characteristics on communication system performance is more obvious. Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), and Code Division Multiple Access (CDMA) are three commonly used m...

Claims

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Application Information

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IPC IPC(8): H04B1/7097H04L1/00H04B13/02
CPCH04B1/7097H04B13/02H04L1/0071
Inventor 景连友殷洪玺
Owner DALIAN UNIV OF TECH
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