SCMA (sparse code multiple access) simple codebook design method under Gauss channel

A Gaussian channel and design method technology, applied in the field of communication systems, can solve problems such as the inability to meet 5G massive connections, and achieve the effect of low BER and good system performance

Active Publication Date: 2016-06-01
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Orthogonal multiple access cannot meet the needs of 5G mass connections because the number of access users is proportional to the orthogonal resources

Method used

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  • SCMA (sparse code multiple access) simple codebook design method under Gauss channel
  • SCMA (sparse code multiple access) simple codebook design method under Gauss channel
  • SCMA (sparse code multiple access) simple codebook design method under Gauss channel

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Embodiment Construction

[0021] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] Use N to represent the length of the codeword, that is, the total number of resource blocks for transmitting data. R is used to represent the number of non-zero elements in the codeword, that is, the number of effective resource blocks occupied by each user during actual transmission. The number of bits transmitted by each user is W, so it can be determined that the maximum number of users using SCMA coding is:

[0023] J m a x = N R

[0024] The number of users actually transmitted on each resource block is:

[0025] d f = J R ...

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Abstract

The invention relates to an SCMA (sparse code multiple access) simple codebook design method under a Gauss channel and belongs to the communication system technical field. The method is mainly applied to conditions under Gaussian channels. The method includes the following steps that: the total constellation diagram of all users on each resource block is designed; a subset segmentation method in trellis coded modulation (TCM) is utilized to generate constellations corresponding to the users; a mapping matrix is constructed; the constellations of the users and the mapping matrix are combined tougher to construct a constellation matrix; and a codebook is generated according to the constellation matrix. With the method of the invention adopted, it can be ensured that the minimum Euclidean distance between constellation points between the users is maximized, and at the same time, it can be ensured that the minimum Euclidean distance between constellation points of the users is maximized; the bit error rate (BER) of a system can be low; and the performance of the system is also favorable under a high overload rate condition.

Description

technical field [0001] The invention belongs to the technical field of communication systems, and relates to a simple SCMA codebook design method under a Gaussian channel. Background technique [0002] The mobile Internet and the Internet of Things are the two main driving forces for the development of mobile communications in the future. Therefore, the number of mobile terminals will show explosive growth in the future, and 5G must meet the characteristics of massive connections. The upgrading of each generation of mobile communication will be accompanied by the evolution of multiple access technology. The existing communication system adopts the orthogonal multiple ) Orthogonally divided resources to access. For example, the OFDMA adopted in the 4G system divides the transmission bandwidth into a series of orthogonal subcarrier sets, and then allocates different subcarrier sets to different users to realize multiple access. Orthogonal multiple access cannot meet the requ...

Claims

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Application Information

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IPC IPC(8): H04L5/00
CPCH04L5/003H04L5/0051
Inventor 邵凯余贝王光宇
Owner CHONGQING UNIV OF POSTS & TELECOMM
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