Underwater acoustic network MAC scheduling method based on time domain interference alignment

Abstract

The invention discloses an underwater acoustic network MAC scheduling method based on time domain interference alignment. The method comprises the following steps: S1, initializing a transmission delay matrix, wherein propagation delay among nodes in an underwater acoustic network refers to time required for transmitting a data signal from a source node to a destination node through a specified transmission medium, and the propagation delay among all node pairs in the network is stored in a delay matrix D; S2, initializing a transmission scheduling matrix; using the scheduling matrix S for storing transmission scheduling of messages in the network; wherein the elements in the S represent transmission conditions of messages in each time slot. The invention relates to the technical field ofunderwater acoustic communication networks. According to the underwater acoustic network MAC scheduling method based on time domain interference alignment, new transmission scheduling is formed; according to the scheduling algorithm, multiple nodes are allowed to receive or transmit messages in the same time domain, message conflicts can be avoided, the network throughput is improved, the servicetransmission situation in practical application is fully considered, and the scheduling algorithm has high practical application value.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic communication networks, in particular to a MAC scheduling method for underwater acoustic networks based on time-domain interference alignment. Background technique [0002] The ocean is rich in resources. As a tool to detect the underwater world, the underwater acoustic network is widely used in military, commercial and technological fields, such as marine military intelligence monitoring and sensitive area monitoring, underwater resource exploration and protection, marine Observation of biological seabed activities, etc. The underwater acoustic network consists of gateway nodes, master nodes, and sensor nodes. [0003] The underwater acoustic network is different from the existing terrestrial sensor network. It mainly communicates through the underwater acoustic channel. The transmission speed of sound in water is 1500m / s, which is 5 orders of magnitude lower than the radio transmissi...

AI Technical Summary

Problems solved by technology

[0003] The underwater acoustic network is different from the existing terrestrial sensor network. It mainly communicates through the underwater acoustic channel. The transmission speed of sound in water is 1500m / s, which is 5 orders of magnitude lower than the radio transmission speed in the air. Therefore, the underwater acoustic network has Larger propagation delay, the attenuation of sound wave transmission is inversely proportional to the frequency, that is, the higher the frequency, the stronger the attenuation of transmission, so the underwater acoustic network generally uses a lower frequency band, which makes the available bandwidth limited. The problem of high propagation delay and narrow bandwidth, there are also challenges such as severe temporal and spatial changes. Underwater noise, multipath, and Doppler effects lead to extremely high bit error rates in underwater acoustic channels. Due to the complexity of underwater acoustic channels, traditional wireless networks MAC protocol cannot be applied to underwater acoustic network

[0004] Based on the characteristics of large propagation delay, limited bandwidth, and high bit error rate of underwater acoustic networks, it is necessary to design a MAC protocol suitable for underwater acoustic networks.

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