A power distribution method based on a multi-user non-orthogonal multiple access technology

Abstract

The invention discloses a power distribution method based on a multi-user non-orthogonal multiple access technology, and belongs to the field of wireless communication. The method mainly comprises thefollowing steps: (1) firstly, detecting channel state information of each user by a base station, and arranging the channel state information according to a descending order; Secondly, listing a total capacity formula under a single-cell multi-user system; And finally, establishing an optimization model of the single-cell multi-user system capacity. (2) performing formula conversion on the objective function, namely the system capacity, and rewriting the objective function into a linear superposition sum of a plurality of increment functions; (3) distributing each subcarrier power by using anaverage power distribution algorithm; And (4) the base station selects the transmitting power of each user to enable each increment function to reach the maximum in the definitional domain, and obtains the distribution power of each user on each subcarrier. According to the method designed by the invention, the subcarriers in the non-orthogonal multiple access system are reasonably and fully utilized while the service quality requirement of a cell user is ensured, and the capacity and the user fairness of the non-orthogonal multiple access system are improved through the reasonable distribution of the power of each user.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, more specifically, to a power allocation method based on multi-user non-orthogonal multiple access technology. Background technique [0002] With the popularization of smart terminals and the development of new mobile communication services such as the Internet of Things, the demand for wireless network applications has shown explosive growth. The traditional multiple access technology is difficult to meet the requirements of 5G due to the problem that the number of users is proportional to the orthogonal resources. The desired continuous wide-area coverage, high-capacity hotspots, large connections with low power consumption, and low latency and high reliability require research on new multiple access technologies to meet this challenge. Non-Orthogonal Multiple Access (NOMA) is widely considered as a promising multiple access technology because of its high capacity and hig...

AI Technical Summary

Problems solved by technology

However, the existing technology assumes that each subcarrier is only allocated to two or fewer users, and only considers a single user or a small number of users to meet the minimum rate requirement

From the point of view of practical application, this assumption not only causes waste of communication resources, but also significantly reduces system performance.

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