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Lyapunov algorithm-based online NOMA multi-antenna system beamforming optimization method

A technology of multi-antenna system and optimization method, which is applied in the directions of diversity/multi-antenna system, radio transmission system, transmission system, etc., to achieve the effect of expanding usage conditions and improving the performance of safe transmission rate

Active Publication Date: 2018-07-20
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The innovation of the present invention is to consider the online mode, learn from the Lyapunov algorithm to solve the energy causality, convert the time-average optimization problem into a single-slot optimization problem, and use the minimum mean square error (MMSE) and alternate optimization algorithm to solve the objective function and constrained nonlinearity. For convex problems, the optimal beamforming matrix at each moment is obtained by iteration

Method used

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  • Lyapunov algorithm-based online NOMA multi-antenna system beamforming optimization method
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  • Lyapunov algorithm-based online NOMA multi-antenna system beamforming optimization method

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Embodiment 1

[0045] 1. System model

[0046] The applicable communication system model of the present invention is made up of a base station and K users, such as figure 1As shown, each user has N antennas, the base station has M antennas, and the transmitter transmits information to K users using the energy receiving technology. It is assumed that the base station can fully know the channel state information (Channel State Information, CSI) of the entire network system. In the tth time slot, the channel response from the base station to the Kth user is expressed as H k (t), the channel response to the eavesdropper is denoted as H e (t), thus, the base station is able to properly allocate its beamforming matrix to improve the security and speed of the entire network.

[0047] 2. Problem description

[0048] According to the non-orthogonal multiple access (NOMA) technology protocol, the sending end adopts superposition coding technology, and the signal x(t) sent by the base station at th...

Embodiment 2

[0108] The effect of the present invention can be further illustrated by the following simulation experiment results, and the basic process of the simulation experiment is referred to Figure 4 .

[0109] for figure 2 and image 3 , set the number of users in the system K=2, the number of user antennas N=2, the number of base station antennas M=2, the channel response from the base station to the strong and weak users is an independent and identically distributed complex Gaussian random with a mean value of 0 and a variance of 10dB and 0dB respectively variable, the channel response of the eavesdropper is an independent and identically distributed complex Gaussian random variable with a mean of 0 and a variance of 0dB, and the total transmit power of the base station is 5dB. The rate constraint for weak users is 0.5bps / Hz. Figure 2 considers the time-averaged rate of the system over 200 slots. The disturbance parameter is X=45, the maximum capacity of the battery is E_max...

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Abstract

The invention provides a Lyapunov algorithm-based online NOMA multi-antenna system beamforming optimization method. The method considers an online mode, solves the energy causality by using the Lyapunov algorithm, converts a time averaging optimization problem into a single timeslot optimization problem, solves a target function and constrained non-convex problem by using MMSE and an alternating optimization algorithm, and obtains an optimal beamforming matrix of each time point through iteration.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, more specifically, to a beamforming optimization method of an online NOMA multi-antenna system based on Lyapunov algorithm. Background technique [0002] With the development of communication technology, spectrum resources are becoming increasingly scarce. Facing the rapidly growing demand for mobile services, how to effectively improve spectrum utilization has become one of the urgent problems to be solved in the 5th generation (5G) mobile communication system. Non-Orthogonal Multiple Access (NOMA) technology is widely considered to be the first choice for its solution. The basic idea of ​​NOMA is to use superposition coding technology to send information in a non-orthogonal manner at the sending end, actively introduce interference information, and use Serial Interference Cancellation (Successive Interference Cancellation, SIC) at the receiving end to enable the receiver ...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04B7/0408
CPCH04B7/0408H04B7/0617
Inventor 陈钦博闫建飞李全忠张旗秦家银
Owner SUN YAT SEN UNIV
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