Collaborative coding and communication method applicable to underwater acoustic network

Abstract

The invention discloses a collaborative coding and communication method applicable to an underwater acoustic network. The method comprises the following steps that through adoption of a distributed outer code and inner code collaborative coding diversity transmission method, one part of source data after outer code coding is transmitted at positions of source nodes, and a relay node forwards the other part of the source data after the outer code coding; at the position of the relay node, ACK signals and transmission of the relay node are combined, and united coding is carried out on the data of the plurality of source nodes; a destination node can recover the data of the source nodes only by accurately receiving any part of the source data after the outer code coding; and at the position of the destination node, the inner codes are united to form iterative decoding, and the accurate receiving probability of the data is improved. The method has the beneficial effects that through utilization of coding gain of outer codes, the receiving accuracy of the relay node for the data of the source nodes can be improved, and the collaborative capacity of a system is improved.

Description

technical field [0001] The present invention relates to the fields of underwater acoustic network, network cooperation and coding, etc. It is mainly a cooperative coding communication method suitable for underwater acoustic network, which utilizes the cooperative coding diversity transmission method of distributed outer code and inner code to improve the data quality of underwater acoustic network. transmission reliability. Background technique [0002] In recent years, cooperative diversity technology has attracted wide attention of wireless communication researchers. This technology uses the principle of space diversity to make single-antenna nodes cooperate with each other and share resources to form a virtual multiple-input multiple-output (MIMO) system to realize space Diversity can not only improve the transmission rate and transmission reliability of the wireless link, but also improve the spectral efficiency, throughput and capacity of the system, providing a new ide...

AI Technical Summary

Problems solved by technology

However, the underwater acoustic channel is a typical time-delay and frequency-shift dual-diffusion channel, which has serious time-delay, multipath, Doppler effect, time-varying, and space-varying, and is considered to be one of the most complicated wireless channels. Under the condition of the underwater acoustic channel, the data transmission of the underwater acoustic network usually has great instability

When the relay node cooperates by decoding and forwarding or encoding and forwarding, if the information sent by the source node cannot be decoded correctly, the relay node will not participate in forwarding the source node information or encoded information, and the system will automatically switch to the non-cooperative mode, greatly Reduce the system's ability to collaborate

At the same time, due to the large delay of underwater acoustic propagation, if the relay node forwards the information of each destination node separately, the throughput of the network will be greatly reduced

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