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Design method of downlink scma codebook based on layered space-time structure

A technology of downlink and design method, applied in the field of downlink codebook design, can solve the problems of high bit error rate, complex signal detection method at the receiving end, etc., achieve simple signal reception, simple demodulation method, and improved coding The effect of modulating capacity

Active Publication Date: 2021-04-20
HARBIN INST OF TECH
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Problems solved by technology

[0004] The present invention aims to solve the existing problems of SCMA codebook design, high bit error rate, and complex way of detecting signals at the receiving end

Method used

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  • Design method of downlink scma codebook based on layered space-time structure
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  • Design method of downlink scma codebook based on layered space-time structure

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specific Embodiment approach 1

[0032] Specific implementation mode one: refer to figure 1 and figure 2 Specifically illustrate the present embodiment, the downlink SCMA codebook design method based on the layered space-time structure described in the present embodiment, the method includes the following steps:

[0033] Step 1, calculating the difference between the channel state coefficients of any two antennas occupied by each user at the base station, and sorting the obtained differences between the channel state coefficients of all users in ascending order to form a user set;

[0034] Step 2, allocate time slot resources in the antenna to each user according to the user set and adopt the regular degree distribution-based differential channel state coefficient sorting resource allocation algorithm and ensure that the number of users carried by each time slot resource is the same, and obtain the SCMA mapping matrix;

[0035] Step 3: The SCMA mapping matrix obtains the constellation point corresponding to...

specific Embodiment approach 2

[0047]Specific embodiment two: this embodiment is to further illustrate the downlink SCMA codebook design method based on the layered space-time structure described in the specific embodiment one. In this embodiment, the method also includes step six,

[0048] Step 6: The receiver demodulates all the received codebooks by using the message passing iterative decoding algorithm to obtain the received signal.

[0049] In this embodiment, the message passing iterative decoding algorithm is also called the MPA iterative decoding algorithm.

specific Embodiment approach 3

[0050] Specific embodiment three: this embodiment is a further description of the downlink SCMA codebook design method based on the layered space-time structure described in specific embodiment one. In this embodiment, any The difference between the channel state coefficients of the two antennas Δh (j) for:

[0051]

[0052] In the formula, Expressed as the nth of the base station T The channel state coefficient between the antenna and the jth user, n T =1,2.

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Abstract

The invention relates to a downlink SCMA codebook design method based on a layered space-time structure, and relates to the technical field of communication signal detection. The invention aims to solve the technical problem of communication signal detection. Use the channel state coefficient of each user to select time slot resources, and use the RD-DCP algorithm to obtain the system mapping matrix F; design the vector d to meet the power constraint conditions and linear correlation conditions; according to the mapping matrix F and vector d, through traversal The generator matrix G is obtained by the search method; the user at the sending end generates the codeword s according to the obtained generator matrix G; after the codeword s reaches the receiver through the fading channel, it is demodulated by the MPA iterative decoding algorithm to obtain the received signal. It is used to design the codebook of the downlink.

Description

technical field [0001] The invention relates to a downlink codebook design method. The invention belongs to the technical field of communication signal detection. Background technique [0002] SCMA (Sparse Code Division Multiple Access), as a new non-orthogonal multiple access technology, meets the requirements of large connection and low delay proposed by the fifth generation mobile communication system with its overload characteristics, so the transmission method of SCMA system It has become the hotspot and key technology of current research. [0003] Space-time coding has high flexibility, excellent anti-fading performance and high information transmission rate, and has developed rapidly. It has become a mature coding method in MIMO systems. However, the research on the combination of SCMA and STBC (space-time block coding) at home and abroad is still a relatively new field, and there are very few related works. Most of the existing research results combine SCMA with m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456H04B7/06H04L5/00
CPCH04B7/0456H04B7/0626H04L5/0016H04L5/0057
Inventor 于启月李焕英刘子靖张翼鹏孟维晓
Owner HARBIN INST OF TECH
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