A Method of Optimizing Beamforming Based on Non-Orthogonal Multiple Access Technology
A non-orthogonal multiple access and beamforming technology, applied in the directions of diversity/multi-antenna systems, space transmit diversity, electrical components, etc. Throughput and other issues, to achieve the effect of improving fairness, ensuring QoS requirements, and reducing inter-beam interference
Active Publication Date: 2019-11-22
XIDIAN UNIV
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Problems solved by technology
However, the zero-forcing beamforming method does not guarantee that the system throughput is optimal
Although some literatures use the optimization method to obtain the optimal beamforming vector, they do not consider the conditions for successful serial interference cancellation and the minimum QoS (Quality of Service) requirement constraints of edge users, which do not meet the non-normal General Communication Requirements for Multiple Access Systems
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[0043] Specific embodiments of the present invention will be described in detail below.
[0044] Such as figure 1 As shown, a method for optimizing beamforming based on non-orthogonal multiple access technology includes the following steps:
[0045] (1), the base station sends superimposed signals to multiple users;
[0046] (2) The user receives the superimposed signal sent by the base station, and obtains the respective signal-to-noise ratios by calculating the signal-to-noise ratio of the superimposed signals, and feeds back the respective signal-to-noise ratios to the base station;
[0047] (3), the base station judges the user attribute through the user's signal-to-noise ratio, and confirms whether the user is a central user or a marginal user;
[0048] (4) The base station performs fixed power allocation through non-orthogonal multiple access technology, central users allocate 20% of the total transmission power, and edge users allocate 80% of the total power;
[0049...
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The invention relates to a beam forming optimization method based on a non-orthogonal multiple access technology. The method comprises the steps that (1), a base station sends superposed signals to multiple users; (2), the users receive the superposed signals sent by the base station, obtain respective signal to noise ratios and feed back respective signal to noise ratios to the base station; (3), the base station judges user attributes through the signal to noise ratios of the users; (4), the base station allocates fixed power based on the non-orthogonal multiple access technology, wherein the 20% of the total transmitting power is allocated to center users, and 80% of the total power is allocated to the edge users; (5), with the purpose of maximizing the system throughput, the base station obtains the optimized beam forming vector by taking a condition for successful serial interference removal and the constraints of the least QoS demands of the edge users into consideration; and (6), the center users in each beam demodulate information through serial interference removal, and the edge users directly demodulate the information by taking the center user as the interference.
Description
technical field [0001] The invention belongs to the field of fifth-generation mobile communication technology, and in particular relates to a method for optimizing beamforming based on non-orthogonal multiple access technology. Background technique [0002] Non-orthogonal multiple access technology is a research hotspot in the fifth generation mobile communication network. Due to its high spectral efficiency and large number of device connections, it has received extensive attention. [0003] The main idea of non-orthogonal multiple access technology is to use the power domain: at the sending end, the information of different users is superimposed on the same resource and assigned different power levels; at the receiving end, the information of different users is separated by serial interference cancellation. [0004] NOMA (non-orthogonal multiple access) can use the power domain to improve spectral efficiency, and MIMO (multiple-input multiple-output system) technology c...
Claims
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IPC IPC(8): H04B7/0408H04B7/0413H04B7/06
CPCH04B7/0408H04B7/0413H04B7/0617
Inventor 赵力强郭成
Owner XIDIAN UNIV