Power domain NOMA cooperative transmission method and device based on bit error rate fairness

A technology of cooperative transmission and bit error rate, which is applied in the field of NOMA cooperative transmission in the power domain, can solve the problems of low user service quality and inability to meet the needs of large-scale user nodes with different data flows and high reliability information transmission.

Active Publication Date: 2019-11-05
ANHUI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the existing technical problems, the present invention provides a power domain NOMA cooperative transmission method and its device based on bit error rate fairness, which solves the problem that in the existing 5G scenario in the application of the Internet of Things, the quality of user service is low and cannot satisfy large Access to large-scale user nodes and high-reliability information transmission for different data flows

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  • Power domain NOMA cooperative transmission method and device based on bit error rate fairness
  • Power domain NOMA cooperative transmission method and device based on bit error rate fairness
  • Power domain NOMA cooperative transmission method and device based on bit error rate fairness

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Embodiment 1

[0083] see figure 1 , this embodiment provides a power domain NOMA cooperative transmission method based on bit error rate fairness, and the power domain NOMA cooperative transmission method includes the following steps (steps 1-5).

[0084] Step 1. Establish a transmission system model. see figure 2 as well as image 3 , at least one relay node, at least two user nodes and at least one base station located in the center of the transmission area are set in the transmission system model. The relay node is a strong user node near the center of the transmission area, and the user node is a weak user node at the edge of the transmission area, and both the relay node and the user node are single-antenna nodes. The relay node acts as a half-duplex relay node and amplifies and forwards the linearly superimposed signals sent by two user nodes. The distribution coefficients of the two user nodes are α 1 and alpha 2 , and the transmitters share the same time domain and frequency ...

Embodiment 2

[0147] This embodiment provides a power domain NOMA cooperative transmission method based on bit error rate fairness, and the power domain NOMA cooperative transmission method is simulated and analyzed on the basis of Embodiment 1. The best order decoded by SIC is to detect in descending order of channel gain, so first s 1 The signal is detected, the s 2 The signal of s is treated as noise, and assuming s 1 The signal is not fully decoded, there is a pair of s 2 The signal is decoded with an error residual. And in the uplink non-orthogonal multiple access communication system, QPSK modulation is adopted to analyze the uplink SER performance of the single relay AF cooperative NOMA system.

[0148] see image 3 , according to two user channel gain assumptions Channel coefficient variance from user 1 to relay node R Channel coefficient variance from user 2 to relay node R Channel coefficient variance from relay node R to destination node D According to the simulated a...

Embodiment 3

[0153] This embodiment provides a power domain NOMA cooperative transmission device based on bit error rate fairness, and the device applies the power domain NOMA cooperative transmission method based on bit error rate fairness in Embodiment 1. The transmission device includes a model establishment module, an upper boundary acquisition module, a decomposition module, a bit error rate acquisition module and a power allocation optimization module.

[0154] The model building module is used to establish a transmission system model, and set at least one relay node, at least two user nodes and at least one base station located in the center of the transmission area in the transmission system model; the relay node is a strong User node, the user node is a weak user node at the edge of the transmission area, and both the relay node and the user node are single-antenna nodes; the relay node acts as a half-duplex relay node and performs linear superposition signals sent by two user node...

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Abstract

The invention discloses a power domain NOMA cooperative transmission method and device based on bit error rate fairness. The method comprises the following steps: establishing a transmission system model; carrying out boundary simplification processing on the received signal of the destination node to obtain upper boundaries of the detection signal and the noise signal; decomposing the upper boundaries of the detection signal and the noise signal into sub-signals containing two independent random variables respectively, wherein the two independent random variables obey the exponential distribution of preset parameters respectively; calculating a moment mother function of a detection signal, simplifying the moment mother function, obtaining an error rate closed-form boundary formula according to the simplified moment mother function, and calculating a closed-form solution of an average symbol error rate through the error rate closed-form boundary formula. According to the method, the service quality of weak users can be improved, the error rate closed boundary formula with a simple structure is obtained, the performance of the error rate can be adjusted through the formula, the fairness and high signal-to-noise ratio conditions of the users can be met, and then the optimization of power distribution and the expansion of various scenes are realized.

Description

technical field [0001] The present invention relates to a power domain NOMA cooperative transmission method in the field of communication technology, in particular to a power domain NOMA cooperative transmission method based on bit error rate fairness, and also relates to a power domain NOMA cooperative transmission device based on bit error rate fairness. Background technique [0002] With the rapid increase in demand for high-speed data services, it is increasingly important to further improve spectral efficiency. As a new type of multiple access technology, non-orthogonal multiple access (NOMA) can greatly improve the spectral efficiency of the system and become one of the key technologies in 5G. Power domain NOMA allocates different transmission power to each user, so that multiple users can share the same traditional orthogonal resources such as time frequency and spreading code; at the receiving end, according to the difference in user channel gain, serial interference...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/08H04W24/02H04W72/04H04W72/08H04B7/026
CPCH04W4/08H04W24/02H04W72/0473H04B7/026H04W72/542Y02D30/70
Inventor 徐磊朱定成姚以静张红伟方红雨李晓辉
Owner ANHUI UNIVERSITY
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