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Beam forming optimization method of online NOMA multi-antenna system based on Lyapunov theory

A multi-antenna system, beamforming technology, applied in diversity/multi-antenna system, radio transmission system, transmission system, etc., can solve problems such as impairing the communication performance of weak users

Active Publication Date: 2018-06-19
SUN YAT SEN UNIV
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Problems solved by technology

This situation will greatly damage the communication performance of weak users (that is, users far away from the sender). Therefore, corresponding measures such as cooperative communication must be taken to avoid insufficient resource utilization for a period of time and improve system performance as much as possible.

Method used

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  • Beam forming optimization method of online NOMA multi-antenna system based on Lyapunov theory
  • Beam forming optimization method of online NOMA multi-antenna system based on Lyapunov theory
  • Beam forming optimization method of online NOMA multi-antenna system based on Lyapunov theory

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Embodiment 1

[0057] (1) System model

[0058] Such as figure 1 As shown, the communication system model applicable to the present invention is composed of a multi-antenna base station and 2K single-antenna receiving users, and 2K users form K clusters through a clustering algorithm, and each cluster has 2 users, 1 strong user and 1 Weak users and strong users have buffer queues to decode and store information of weak users and forward the information to weak users. Consider a time period with M moments, and each moment has K+1 time slices. The first time slice considers that the base station uses NOMA to send information, and the remaining K time slices are decoded and forwarded by K strong users to K clusters Weak users. Assuming that the base station can fully know the channel state information (Channel State Information, CSI) of the entire network system, the channel response from the base station to the strong user in the Kth cluster is expressed as h k，m , the channel response to t...

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Abstract

The invention provides a beam forming optimization method of an online NOMA multi-antenna system based on the Lyapunov theory. An online mode is considered, the data causality is solved via the Lyapunov theory, a long-term time average optimization problem is converted into an optimization problem of each moment, slack variables are imported by using a concave-convex optimization algorithm, multi-dimensional first-order Taylor expansion is performed to solve the non-convex problem of objective functions and constraints, and optimal beam forming and power allocation schemes at each moment are obtained through iteration.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and more specifically, relates to a beamforming optimization method of an online NOMA multi-antenna system based on Lyapunov theory. Background technique [0002] In recent years, with the rapid development of mobile communications, spectrum resources have become more and more scarce. Facing the rapidly growing demand for mobile services, how to effectively improve the utilization of limited spectrum resources has become an urgent need for the fifth generation (5G) mobile communication system. One of the key problems to be solved. With the feature of effectively improving system capacity, Non-Orthogonal Multiple Access (NOMA) technology is widely considered to be a promising multiple access technology. The basic idea of ​​NOMA is to use power multiplexing technology to transmit in a non-orthogonal manner at the transmitting end, actively introduce interference information,...

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Application Information

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IPC IPC(8): H04B7/0408H04B7/0426H04B7/06H04B7/08
CPCH04B7/0408H04B7/0426H04B7/0617H04B7/0632H04B7/0817Y02D30/70
Inventor 龚倩昀黄姗李全忠张旗秦家银
Owner SUN YAT SEN UNIV
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