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Power distribution method for non-orthogonal multiple access system

A non-orthogonal multiple access and access system technology, which is applied in the field of power allocation of non-orthogonal multiple access systems, can solve the problems of impairing the communication performance of weak users and not considering the fairness of resource allocation of each user in the communication system, etc. , to maximize the utility

Inactive Publication Date: 2017-09-15
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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). From the perspective of practical application, this single strategy does not take into account the fairness of resource allocation among users in the communication system.

Method used

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  • Power distribution method for non-orthogonal multiple access system
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  • Power distribution method for non-orthogonal multiple access system

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Embodiment 1

[0031] The applicable communication system model of the present invention is made up of a single-antenna base station and N single-antenna receiving users; The channel response from the base station to the nth user is expressed as h n ,in It is assumed that the base station can fully know the channel state information (Channel State Information, CSI) of the entire network system; therefore, the base station can properly allocate its transmission power to improve the communication performance of the communication system; without loss of generality, it is assumed that the communication between the base station and each user The channel response satisfies the inequality |h 1 |≤|h 2 |≤…≤|h N |.

[0032] According to the non-orthogonal multiple access (NOMA) technology protocol, the sending end adopts superposition coding technology, so the received signal of the nth user can be expressed as:

[0033]

[0034] where p n Indicates the transmit power allocated by the base st...

Embodiment 2

[0106] 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 with reference to Figure 4 .

[0107] for figure 1 , set the number of users in the system to N=3. The channel response from the base station to each user has a mean of 0 and a variance of The independent and identically distributed complex Gaussian random variable of , and the total transmit power of the base station is P / σ 2 = 20dB.

[0108] for figure 2 and image 3 , set the number of users in the system to N=2. channel variance for strong users Weak user channel variance is set to and

[0109] (6) Simulation analysis and results

[0110] figure 1 is the convergence process diagram of the iterative algorithm in the present invention under the condition of given transmission power. From the simulation results, it can be seen intuitively that the algorithm can quickly converge to a stabl...

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Abstract

The invention relates to a power distribution method for a non-orthogonal multiple access system. The method comprises the following steps of S1, initializing an iteration coefficient and a group of power distribution schemes satisfying a constraint condition; S2, calculating a channel balance factor and a slack variable of each user based an initial power distribution scheme; S3, optimizing the power distribution of each user based on the calculated channel balance factor and the slack variable; S4, integrating the optimized power distribution of each user, thereby obtaining an optimized power distribution scheme, and calculating total utility of the system under the optimized power distribution scheme; and S5, repeatedly performing steps S2-S4 until the total utility of the system is converged through utilization of the optimized power distribution scheme, and outputting the corresponding optimized power distribution scheme as the optimized distribution scheme when the total utility of the system is converged.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and more specifically, relates to a power allocation method of a non-orthogonal multiple access system. Background technique [0002] With the rapid development of mobile communications, spectrum resources are becoming more and more scarce. Facing the rapidly growing demand for mobile services, how to effectively improve the utilization of limited spectrum resources has become a key problem to be solved in the 5th generation (5G) mobile communication system. one. Due to its ability to effectively increase 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, and implement serial interference cancellation (Successive Interfer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/18H04W52/26H04W52/34H04W52/36H04W72/04
CPCH04W52/18H04W52/267H04W52/346H04W52/367H04W72/0473H04W72/53
Inventor 李重阳秦家银
Owner SUN YAT SEN UNIV
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