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Energy efficiency-based resource allocation method in an SCMA downlink system

A technology for resource allocation and energy efficiency, which is applied in transmission systems, digital transmission systems, and energy consumption reduction, and can solve problems such as codebook coding and mapping gain, and SCMA system energy efficiency issues, etc.

Active Publication Date: 2019-05-17
CHONGQING UNIV OF POSTS & TELECOMM +1
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AI Technical Summary

Problems solved by technology

Existing researchers mostly study the system capacity problem, and seldom consider the energy efficiency problem in the SCMA system; when considering the energy efficiency problem, many of them randomly allocate the codebook, and do not consider the encoding and mapping brought by the codebook gain

Method used

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  • Energy efficiency-based resource allocation method in an SCMA downlink system
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  • Energy efficiency-based resource allocation method in an SCMA downlink system

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Embodiment Construction

[0037] The technical solutions in the embodiments of the present invention will be described clearly and in detail below with reference to the drawings in the embodiments of the present invention. The described embodiments are only some of the embodiments of the invention.

[0038] The technical scheme that the present invention solves the problems of the technologies described above is:

[0039] Such as figure 1Shown: Assume a single-cell multi-user SCMA downlink cellular network, which includes a base station, K users, the number of subcarrier resources is N, and the number of codebooks is M. In order to avoid the interference of the same codebook in the cell, it is stipulated that each user can only be allocated one codebook at most. Considering the sparse nature of SCMA codewords, a message passing algorithm (MPA) can be used to detect multiplexed signals on the same subcarrier. Therefore, different codebooks can be considered as orthogonal resources, and multiple acces...

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Abstract

The invention discloses an energy efficiency-based resource allocation method in an SCMA downlink system. Under the advocation of green communication, the transmission quality of a user is ensured, and the energy consumption and the environmental pollution are reduced, so that sustainable development is realized. According to the energy efficiency priority joint resource allocation method providedby the invention, an energy efficiency-based joint codebook and power iterative allocation algorithm is provided aiming at maximizing the system energy efficiency, and the method comprises the following steps of: firstly, assuming that power is fixedly allocated, and designing an energy efficiency gain-based codebook allocation scheme; secondly, under the condition that codebook distribution is fixed, power distribution is converted into a convex optimization problem to be solved; and finally iteratively distributing the codebook and the power to obtain the maximum energy efficiency. According to the method, the energy efficiency performance of the system is improved while the transmission quality of the user is ensured, and the method is of great significance to green communication of the SCMA downlink system.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an energy efficiency-based resource allocation scheme of a sparse code multiple access technology (Sparse Code Multiple Access, SCMA). Background technique [0002] Facing 2020 and the future, data traffic, device connections and business demands are growing explosively. The fifth generation mobile communication system (5G) will meet the needs of flexible network deployment and efficient operation and maintenance, and greatly improve spectrum efficiency, energy efficiency and cost efficiency. Realize the sustainable development of mobile communication network. [0003] Green communication is a communication concept with the goal of energy saving and emission reduction. Its main purpose is to reduce energy consumption and environmental pollution while ensuring the quality of user transmission, so as to achieve sustainable development. In a communication...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04W72/04H04W72/08H04W72/54
CPCY02D30/70
Inventor 袁泉代云霞罗菊
Owner CHONGQING UNIV OF POSTS & TELECOMM
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