A flood monitoring data transmission method based on non-orthogonal multiple access

Abstract

The invention discloses a flood monitoring data transmission method based on non-orthogonal multiple access. A plurality of water level monitoring points are set in the same river channel of a water level monitoring system; the distance from each monitoring point to a base station is different; the base station evaluates channel condition of the monitoring points, then carries out pairing and grouping and divides a frequency domain of a multiple access channel into a plurality of orthogonal sub-channels; each sub-channel is shared by at least two monitoring points; and non-orthogonal transmission is employed among the sub-channels. The base station allocates powers to the monitoring points on each sub-channel according to certain power allocation algorithm. Each monitoring point receiver finishes decoding messages through adoption of a serial interference elimination technology. According to the scheme provided by the embodiment of the invention, the monitoring quality of the water level system is not influenced, and moreover, the problem that spectrum resources are insufficient is solved creatively.

Description

technical field [0001] The invention relates to the technical field of flood disaster emergency communication, in particular to a flood monitoring data transmission method based on non-orthogonal multiple access. Background technique [0002] Due to the rapid development of wireless communication, the shortage of spectrum resources has always been the bottleneck for the improvement of data rate and service quality. It is urgent to find a mobile technology that can not only meet user experience requirements but also improve spectrum efficiency. In this context, informal Communication multiple access technology emerges at the historic moment. The multiple access technologies used in traditional wireless communication system models include time division multiple access, code division multiple access, frequency division multiple access, etc. These technologies divide the dimension of the signal space into orthogonal user. The non-orthogonal multiple access technology breaks th...

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Problems solved by technology

[0004] When a flood disaster occurs, there is a shortage of spectrum resources in the existing technology. When a flood disaster occurs, a large number of users suddenly access the base station and occupy a large amount of spectrum resources, which seriously affects the flood control alarm and monitoring data transmission of key river monitoring stations.

The existing data mode adopts the orthogonal multiple access technology, and each sub-channel is occupied by only one user, ignoring the full use of spectrum resources, and cannot guarantee that when a large number of users burst into access, each monitoring site can can work normally

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