User maximum sum rate optimization method in environmental backscatter access NOMA system

A technology of backscattering and optimization methods, applied in transmission systems, digital transmission systems, advanced technologies, etc., can solve the problems of removing interference, not reducing system performance, not considering the joint optimization of base station power allocation and scattering coefficients, etc.

Active Publication Date: 2021-03-09
HENAN POLYTECHNIC UNIV
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Problems solved by technology

Therefore, in this case, the receiver cannot completely correctly remove interference from weak cellular devices which can significantly degrade system performance
A...

Method used

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  • User maximum sum rate optimization method in environmental backscatter access NOMA system
  • User maximum sum rate optimization method in environmental backscatter access NOMA system
  • User maximum sum rate optimization method in environmental backscatter access NOMA system

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Embodiment Construction

[0057] An embodiment of the present invention is given below to further describe the present invention in detail.

[0058] Such as figure 1 As shown in , consider a NOMA system with one base station, two users and one backscattering environment backscattering, and all devices are configured with a single antenna. Let S represent the base station, and R i and R j Denotes two users, F denotes backscatter, and and H SF Denotes the base station to user R i and R j and the channel gain of the backscatter F, and Denotes backscatter F to user R i and R j channel gain, P s is the transmit power of the base station.

[0059] The user's maximum rate and constraints are expressed as follows

[0060]

[0061] s.t.P s ξ≤P s (1-ξ)

[0062] 0≤ζ≤1

[0063] Among them, ξ represents the power allocation coefficient of the base station, ζ represents the scattering coefficient of backscattering, and the constraint bar P s ξ≤P s (1-ξ) indicates that the transmission power al...

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Abstract

The invention discloses a user maximum sum rate optimization method in an environmental backscatter access NOMA (Non-Orthogonal Multiple Access) system, which is suitable for a system comprising a base station, two users and a backscatter, and all equipment is provided with a single antenna. A base station allocates power to two users according to a power allocation principle, backscattering is carried out on the two users under the condition that a scattering coefficient is greater than 0 and less than 1, a joint optimization problem of realizing the optimal sum rate of the two users is established, and the optimization problem is a double-target optimization problem of the power allocation coefficient and the backscattering coefficient of the base station. A scattering coefficient is fixed, a Lagrange function is established by utilizing a KKT condition to obtain a power distribution coefficient optimization value, the power distribution coefficient optimization value is substitutedinto an original target function, the optimization value of the scattering coefficient is solved according to the same method, and finally, the two solved optimization values are substituted into a sum rate formula to obtain the optimized sum rate.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a user maximum sum rate optimization method in an environment backscattering access NOMA system. Background technique [0002] Future 6G technology promises to support mass deployments of low-power wireless connections with high data rates and minimal latency. A power-domain NOMA with ambient backscatter communication system provides hyperspectral and energy-efficient communication in massive Internet of Things (IoT) networks. More specifically, NOMA using superposition coding and sequential interference cancellation (SIC) technology allows multiple cellular devices to communicate using different levels of transmission power on the same spectrum or time resource, and NOMA also ensures that Fairness between different cellular devices on resources. On the other hand, ambient backscatter communication has received great attention due to its ultra-low pow...

Claims

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Application Information

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IPC IPC(8): H04W72/04H04L12/24
CPCH04W72/0473H04L41/142Y02D30/70
Inventor 李兴旺乔大伟孙江峰郑一珂谢珍
Owner HENAN POLYTECHNIC UNIV
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