Dynamic cooperative relay transmission method based on power domain non-orthogonal multiple access technology

A non-orthogonal multiple access and access technology, applied in the field of dynamic cooperative relay transmission, can solve the problems of low reliability of edge users and waste of time slot resources of base stations

Inactive Publication Date: 2018-09-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the waste of base station time slot resources in the existing coordinated transmission scheme based on power domain non-orthogonal multiple access technology and the direct and relay coordinated

Method used

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  • Dynamic cooperative relay transmission method based on power domain non-orthogonal multiple access technology
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  • Dynamic cooperative relay transmission method based on power domain non-orthogonal multiple access technology

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specific Embodiment approach 1

[0068] Specific implementation mode one: combine figure 1 To illustrate this embodiment, the specific process of the dynamic cooperative relay transmission method based on power domain non-orthogonal multiple access technology in this embodiment is as follows:

[0069] Step 1. Set up a cell containing N mobile users. The number of central users who communicate directly with the base station S is M, and the number of edge users who cannot directly communicate with the base station S is L. L≥M / 2, N=L+M , sort the channel quality of the central users, and select two central users with the best channel quality, an edge user with the best channel quality, and a decoding and forwarding relay closest to the edge user for pairing. Therefore, M / 2 user pairs can be obtained, and frequency division multiple access is used to distinguish between different user pairs;

[0070] The information transmission process includes two phases: the direct transmission phase and the cooperative transm...

specific Embodiment approach 2

[0115] Specific embodiment 2: the difference between this embodiment and specific embodiment 1 is: in the step 4, it is judged that the central user U 3 Whether the edge user U is successfully decoded 2 Information x 2 , yes, go to step 6; no, go to step 5;

[0116] The specific process is:

[0117] Set the bit error rate threshold (manually set), greater than or equal to the bit error rate threshold, the decoding fails; less than the bit error rate threshold, the decoding is successful;

[0118] BER threshold is 10 -3 -10 -5 .

[0119] Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0120] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in the step nine, it is judged whether the decoding and forwarding relay R has successfully decoded the information x 2 , yes, go to step 10; no, go to step 11; the specific process is:

[0121] Set the bit error rate threshold (manually set), greater than or equal to the bit error rate threshold, the decoding fails; less than the bit error rate threshold, the decoding is successful;

[0122] BER threshold is 10 -3 -10 -5 .

[0123] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a dynamic cooperative relay transmission method based on power domain non-orthogonal multiple access technology, and relates to a dynamic cooperative relay transmission method.The purpose of the invention is to solve the problems of base station slot resource waste of the existing cooperative transmission scheme based on the power domain non-orthogonal multiple access technology and low edge user reliability of the direct relay cooperative transmission scheme based on the power domain non-orthogonal multiple access technology. The process is: in a direct transmission phase, a base station S broadcasts a superposition coding signal xs of information x1 required by a central user U1 and information x2 required by an edge user U2, performing: the U1, a U3, and a relayR respectively decode x2 received signals by adopting a least mean square error algorithm, and then U1 decodes x1 using a serial interference cancellation algorithm; in a cooperative transmission phase, the S broadcasts x2 information required by the U3, the R broadcasts x2, and the U1 broadcasts x2 according to a dynamic protocol, respectively: U3 decodes x3 the received signals using MMSE; andthe U2 decodes x2 the received signals using maximum ratio combining and MMSE. The method is used in the field of wireless cooperative relay transmission.

Description

technical field [0001] The invention relates to the field of wireless cooperative relay transmission, in particular to a dynamic cooperative relay transmission method. Background technique [0002] The rapid development of the mobile Internet and the Internet of Things puts forward higher requirements for data rates, so how to improve system spectrum efficiency and reduce end-to-end delay will become the focus of next-generation mobile communication technologies. The application of non-orthogonal multiple access technology in cooperative relay network can greatly improve the spectrum efficiency of wireless communication systems. First, the multiple access technologies commonly used in cellular networks are: frequency division multiple access (FDMA), time division multiple access (TDMA), code division multiple access (CDMA) and a mixture of multiple orthogonal multiple access technologies way etc. Since different users use orthogonal time, frequency and code domain resource...

Claims

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Application Information

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IPC IPC(8): H04B7/155H04B7/026H04B7/26H04W52/46
CPCH04B7/026H04B7/15592H04B7/2606H04W52/46
Inventor 王钢许尧郑黎明张文硕周若飞王金龙李真
Owner HARBIN INST OF TECH
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