Adaptive coding modulation scheme and resource scheduling method based on sparse code multiple access (SCMA) system

A technology of sparse code multiple access and adaptive coding, which is applied in the fields of adaptive coding and modulation schemes and resource scheduling, and can solve the problem that the optimal allocation of system resources cannot be realized in the case of multi-users, SCMA systems cannot select coding and modulation schemes, and difficult system throughput and transmission link quality trade-offs and other issues

Active Publication Date: 2016-06-01
严格集团股份有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the SCMA system with a fixed modulation and coding method cannot dynamically select an appropriate coding and modulation scheme according to changes in channel conditions, which makes it difficult to balance the syste

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  • Adaptive coding modulation scheme and resource scheduling method based on sparse code multiple access (SCMA) system
  • Adaptive coding modulation scheme and resource scheduling method based on sparse code multiple access (SCMA) system
  • Adaptive coding modulation scheme and resource scheduling method based on sparse code multiple access (SCMA) system

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specific Embodiment approach 1

[0038] Specific implementation mode 1: The adaptive coding and modulation scheme and resource scheduling method based on the sparse code multiple access system in this implementation mode are specifically prepared according to the following steps:

[0039]Step 1. Establish a system model; establish a cellular network multi-cell system, select a cell in the cellular network multi-cell system, and use the sparse code multiple access SCMA method to access the users participating in the scheduling of the cell to the cellular network multi-cell system middle;

[0040] Among them, each cell in the multi-cell system is a regular hexagon with a radius of 500m; and each cell is adjacent to six cells, and the users participating in the scheduling are only randomly distributed in each cell; the users participating in the scheduling The simulated services are all real-time video streaming services; the guaranteed data transmission rate (GBR) required by real-time video streaming services ...

specific Embodiment approach 2

[0063] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is: the specific process of obtaining a pair of 16-point SCMA codebook according to the constellation diagram calculation in step 2 is:

[0064] Here we take the most complex 16-point SCMA codebook construction method as an example to introduce;

[0065] Step 21, draw two identical standard QPSK constellation diagrams, which are respectively QPSK1 as shown in Figure 1 (a) and QPSK2 as shown in Figure 1 (b); wherein, there are 4 constellation points in the QPSK constellation diagram, and 4 constellation points All on a circle, the angle between two adjacent constellation points and the origin of the four constellation points is 90°, the distance between the constellation point and the origin represents the amplitude of the modulated signal, and the connection between the constellation point and the origin The angle between the positive semi-axis and the ...

specific Embodiment approach 3

[0079] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 or 2 is that in step 3, according to the instantaneous downlink SINR value, the user reports the corresponding CQI value to the base station at each TTI, and the base station reports the CQI information in time according to the reported CQI information. Adjust and update the user's channel condition information specifically as follows:

[0080] When the channel condition is good, that is, SINR>10.3, high-order modulation and high channel rate are used, that is, according to a pair of 16-point SCMA codebook modulation to achieve high transmission rate and high throughput; When the difference SINR<4.606, the low-order modulation is used to modulate according to a pair of 4-point SCMA codebook to ensure the quality of the transmission link. When 4.606

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Abstract

The invention discloses an adaptive coding modulation scheme and resource scheduling method based on a sparse code multiple access (SCMA) system, and relates to an adaptive coding modulation scheme and resource scheduling method. The adaptive coding modulation scheme and resource scheduling method based on the SCMA system is brought forward for solving the problem of incapability of realizing optimal distribution of system resources in case of multiple users due to difficult balance between system throughput and transmission link quality, caused by incapability of dynamically selecting a proper coding modulation scheme according to change of a channel condition by use of an SCMA system with a fixed modulation coding mode. The method is realized by the following steps: 1, establishing a system model; 2, constructing a pair of 4-point SCMA codebooks, a pair of 8-point SCMA codebooks and a pair of 16-point SCMA codebooks; 3, performing optimal distribution of system resources in case of multiple users; 4, performing resource scheduling on users after adaptive modulation and coding, and the like. The method provided by the invention is applied to the field of adaptive coding modulation scheme and resource scheduling.

Description

technical field [0001] The present invention relates to an adaptive coding and modulation scheme and a resource scheduling method, in particular to an adaptive coding and modulation scheme and a resource scheduling method based on a sparse code multiple access system; Background technique [0002] Sparse code multiple access (SCMA) is a new type of non-orthogonal multiple access method. It is a high-speed transmission technology proposed by Huawei for high spectrum utilization efficiency. This air interface technology has been listed as a candidate for 5G mobile communication Compared with the traditional multiple access technology, it has the advantages of high capacity, small delay, fast transmission rate, strong anti-multipath ability, and overcomes the short-range effect of CDMA. [0003] However, the relevant research on SCMA is still very limited at present, and many theoretical researches are still blank. Taking Adaptive Modulation and Coding (AMC) technology as an ex...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04W72/04
CPCH04L1/0009H04W72/0446H04W72/0453
Inventor 韩帅郭诚台祥雪石硕孟维晓
Owner 严格集团股份有限公司
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