Optimization method for overload characteristics of SCMA uplink multiple access system

A technology of access system and overload characteristics, applied in the field of code domain non-orthogonal multiple access, can solve the problems of reducing the Euclidean distance between constellation points and high bit error rate, and achieve good performance and system bit error rate performance. Effect

Inactive Publication Date: 2018-01-26
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The mother constellation used in it is on a straight line, and the codebook of other users can be obtained by rotation. However, when high-order modulation is used, the constellation points corresponding to the user are limited to a straight line, which will inevitably greatly reduce the Euclidean distance between constellation points. , the bit error rate is relatively high

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  • Optimization method for overload characteristics of SCMA uplink multiple access system
  • Optimization method for overload characteristics of SCMA uplink multiple access system
  • Optimization method for overload characteristics of SCMA uplink multiple access system

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Embodiment Construction

[0042] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0043] Combining with the subset segmentation method in trellis coded modulation, the present invention proposes an optimal design method for the overload characteristics of sparse code multiple access, first generating the total constellation diagram of all users on each resource block, and then using the signal subset segmentation The constellation diagram of each user is generated from the overall constellation diagram on the resource block, and finally the codebook is designed in combination with the low-density spreading code. At the receiver, the message passing algorithm (Message Passing Algorithm, MPA) is used to process to decode. Specifically include the follo...

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Abstract

The invention discloses an optimization method for the overload characteristics of a SCMA uplink multiple access system. The optimization method for the overload characteristics of the SCMA uplink multiple access system comprises the following steps: designing the total constellation graph of all users on each resource block; generating the constellation corresponding to each user by means of thesubset segmentation method in the grid coded modulation; generating a constellation matrix with a low density spread spectrum sequence; and generating a user codebook by the constellation matrix. Compared with the traditional multiple access communication, the SCMA can break through the bottleneck of 4G, access more users with equal resources, and achieve the effect of massive connection; the invention considers that the overload factors of the SCMA are important factors to realize the mass connection and analyzes the relationship between the overload factors and the codebook; the overload factors are not only related to the number of subcarriers and non zero dimensions, but also are crucial to the performance of system bit error rate; therefore, under the condition of high overload rate,the performance of the codebook designed by the optimization method for the overload characteristics of the SCMA uplink multiple access system also shows good performance, and the prospect for development is great.

Description

technical field [0001] The invention relates to a method for optimizing the overload characteristics of an SCMA uplink multiple access system, in particular to a method for optimizing the overload characteristics of an SCMA uplink multiple access system under a Gaussian channel, and belongs to the technical field of code domain non-orthogonal multiple access. Background technique [0002] The development of modern mobile communication technology began in the 1920s, and commercial use began in the early 1980s. The evolution from the first generation to the fourth generation of mobile communication systems can be described as rapid development. In order to meet the needs of the times and the rapid development of the mobile Internet, a new generation of mobile communication technology - 5G (fifth generation communication system) was developed. Nowadays, candidate access technologies in 5G are emerging in an endless stream, such as air interface waveform technology F-OFDM (Filte...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W28/02H04W28/04H04L1/00H04L5/00H04L27/34
Inventor 马梦娟周健
Owner NANJING UNIV OF POSTS & TELECOMM
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