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Power distribution method for non-orthogonal multiple access (NOMA) system

A non-orthogonal multiple access and access system technology, applied in the field of power allocation of non-orthogonal multiple access systems, can solve problems such as waste of resources and reduce system performance, achieve optimal and reasonable allocation, solve reachability and rate maximized effect

Active Publication Date: 2017-12-12
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a non-orthogonal multiple access system power allocation method in order to solve the defects of resource waste and system performance reduction caused by the power allocation method of the non-orthogonal multiple access communication system in the prior art.

Method used

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  • Power distribution method for non-orthogonal multiple access (NOMA) system
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  • Power distribution method for non-orthogonal multiple access (NOMA) system

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Embodiment 1

[0034] refer to figure 1 , the system model of the non-orthogonal multiple access system applicable to the present invention consists of a base station and M receiving users, and each node has only a single antenna. The entire bandwidth of the system is divided into N subcarriers, and each subcarrier is allowed to be shared by M users. On each subcarrier, the transmitted signal from the base station experiences flat channel fading. On the nth subcarrier, the channel response from the base station to the mth user is denoted by h m，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 increase the reachability and rate of the entire network.

[0035] According to the non-orthogonal multiple access (NOMA) protocol, the sending end adopts superposition coding technology, so the base station is located at t...

Embodiment 2

[0105] 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 .

[0106] for figure 2 and image 3 , the number of subcarriers corresponding to the system is N=16, and the number of receiving users M=2. On all subcarriers, the channel response from base station to user 1 is zero mean and variance δ 2 The independent and identically distributed complex Gaussian random variable of ; the channel response from the base station to user 2 is an independent and identically distributed complex Gaussian random variable with mean 0 and variance 1. By limiting δ 2 ≤1, indicating that user 1 and user 2 are weak users and strong users, respectively. Therefore, the reachability and rate of weak users on all subcarriers is expressed as Strong users are

[0107] figure 2 is the variance of responses to different channels, given P 1 =19dB, the power ...

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Abstract

The invention relates to a power distribution method for a non-orthogonal multiple access (NOMA) system. The method provided by the invention has the advantages that subcarriers in the NOMA system can be effectively and sufficiently utilized; and through optimization of reasonable power distribution, the maximum achievable rate of the NOMA system can be achieved.

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] In the past few decades, data traffic has increased greatly, and the problem of explosively increased traffic has become one of the key problems that the fifth generation (5G) mobile communication system urgently needs to solve. Due to the feature of effectively increasing system capacity, Non-Orthogonal Multiple Access (NOMA) technology is widely considered to be a promising multiple access technology. As we all know, in a cellular network, in order to avoid inter-user interference, traditional orthogonal multiple access technology does not allow resource reuse, however, at this point, the communication system based on non-orthogonal multiple access technology Multiple users can share the same communication resources such as time, code and ...

Claims

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Application Information

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IPC IPC(8): H04W52/18H04W52/26H04W52/28H04W52/34H04W52/36H04W72/04
CPCH04W52/18H04W52/267H04W52/282H04W52/285H04W52/346H04W52/367H04W72/0473H04W72/53
Inventor 陈献才张旗秦家银
Owner SUN YAT SEN UNIV
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