Cellular network transmission method based on uplink non orthogonal multiple access relay assistance

Abstract

The invention discloses a cellular network transmission method based on uplink non orthogonal multiple access relay assistance. The method comprises the following steps: forming a cluster by N users within the coverage of a relay node in a cellular network, wherein the relay is located at the central position of the cluster; the uplink information transmission process of the users in the cluster is as follows: user-relay node-base station. It is assumed that the relay node transmits information to the base station while the user transmits the information to the relay node within a time length T. The user in the cluster transmits the information to the relay node in an orthogonal frequency division multiple access mode on resource allocation, and a single user only occupies on frequency band resource; the relay node works in a full duplex mode, the user information arriving at the relay node is immediately decoded and forwarded to the base station, and an NOMA mode is adopted in the bandwidth resource allocation in the process, and the user information is transmitted to the base station by all bandwidths in the cluster; and numerical simulation results show that compared with the traditional method of merely using the OFDMA uplink transmission method, the user uplink information transmission scheme provided by the invention can effectively improve the spectrum effectiveness of the system.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and more specifically relates to a cellular network transmission method based on uplink non-orthogonal multiple access relay assistance. Background technique [0002] With the large-scale popularity of smart terminals and the popularization of smart services such as smart meter reading, smart transportation, and smart grid in recent years, the data traffic carried by mobile networks has increased rapidly. The sharp increase in mobile network traffic demand has brought greater pressure on the already scarce wireless spectrum resources. Improving the utilization of spectrum resources has become an urgent problem to be solved in contemporary broadband wireless communications. [0003] In the traditional OMA (Orthogonal Multiple Access, Orthogonal Multiple Access) technology, only a single wireless resource can be allocated to one user, such as OFDMA (Orthogonal Frequency Division Mul...

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Problems solved by technology

[0003] In the traditional OMA (Orthogonal Multiple Access, Orthogonal Multiple Access) technology, only a single wireless resource can be allocated to one user, such as OFDMA (Orthogonal Frequency Division Multiple Access, Orthogonal Frequency Division Multiple Access) technology, which cannot Users allocate different transmission powers to achieve power domain multiplexing, so the spectrum efficiency is low, and wireless spectrum resources cannot be effectively saved, resulting in waste of spectrum resources

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