User matching and power distribution method of MIMO-NOMA (Multiple Input Multiple Output-Non-Orthogonal Multiple Output) downlink communication system

A technology of MIMO-NOMA and communication system, which is applied in the field of user matching and power allocation of MIMO-NOMA downlink communication system, can solve the problems of communication system performance degradation, etc., and achieve the improvement of total throughput, low computational complexity, and guaranteed minimum rate Effect

Active Publication Date: 2020-03-27
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect that the current user matching method is likely to cause the performance degradation of the entir...

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  • User matching and power distribution method of MIMO-NOMA (Multiple Input Multiple Output-Non-Orthogonal Multiple Output) downlink communication system
  • User matching and power distribution method of MIMO-NOMA (Multiple Input Multiple Output-Non-Orthogonal Multiple Output) downlink communication system
  • User matching and power distribution method of MIMO-NOMA (Multiple Input Multiple Output-Non-Orthogonal Multiple Output) downlink communication system

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0051] The single-cell MIMO-NOMA downlink communication system model is as follows: figure 1 As shown, the cellular center is a base station (BaseStation, BS), and the base station deployment N t root antenna. The users in the cell are divided into N clusters, when N = N t When , each Beam Forming (BF) vector matches a single cluster. Usually, the total number of antennas of the user is greater than the total number of antennas of the base station. Assuming that each user in the cell is equipped with one antenna, the total number of receiving antennas of the user is L . Let each cluster have K users, the entire cellular system contains users (receiving antennas).

[0052] For the ...

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Abstract

The invention discloses a user matching and power distribution method of an MIMO-NOMA downlink communication system. The user matching method comprises the following steps: dividing all users into a strong user group and a weak user group according to a channel gain sorting result, sequentially selecting the users of the strong user group, calculating the correlation coefficients between the usersand each user of the weak user group, selecting the weak user with the highest correlation coefficient as the weak user of the cluster where the strong user is located, and respectively excluding thematched users from the respective user groups; and completing until matching of all strong users and weak users. According to the user allocation method provided by the invention, the inter-cluster interference on weak users in the cluster in a scene with relatively low inter-user channel relevancy is less than that of a traditional MIMO-NOMA scheme, so that the total throughput of a communication system is improved; the power distribution method provided by the invention has relatively low calculation complexity, and ensures the lowest rate of the users in the cluster while maximizing the total throughput of the communication system.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a user matching and power allocation method of a MIMO-NOMA downlink communication system. Background technique [0002] With the rapid development of communication technology, mobile data traffic is increasing exponentially. It is estimated that by 2020, data traffic will increase by at least 1000 times compared to 2010. Faced with the current situation of scarce spectrum resources, new technologies are urgently needed to improve the capacity of communication systems. Non-Orthogonal Multiple Access (NOMA) is one of the key technologies of 5G. Compared with 4G Orthogonal Multiple Access (OMA) technology, it can make better use of system spectrum resources and improve system total throughput. [0003] NOMA uses the difference in signal power to distinguish signals, and the channel is changed from exclusive use of a single signal to superposition and multiplexing...

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Application Information

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IPC IPC(8): H04B7/0426H04B7/0413H04L25/03
CPCH04B7/0426H04B7/0413H04L25/03331H04B7/0452
Inventor 陆音瞿亦黄杨楚瀛李滔森王秀梅朱洪波
Owner NANJING UNIV OF POSTS & TELECOMM
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