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Downlink SCMA codebook design method based on layered space-time structure

A downlink and design method technology, which is applied in the field of downlink codebook design, can solve the problems of complex signal detection methods and high bit error rates at the receiving end, achieve simple demodulation methods, simple received signals, and improve coding and modulation The effect of capacity

Active Publication Date: 2020-04-17
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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  • Downlink SCMA codebook design method based on layered space-time structure
  • Downlink SCMA codebook design method based on layered space-time structure
  • Downlink SCMA codebook design method based on layered space-time structure

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specific Embodiment approach 1

[0032] Specific implementation mode one: refer to figure 1 with 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 t...

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 discloses 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. The method comprises the steps of carrying out time slot resource selection by utilizing the channel state coefficient of each user, and obtaining a system mapping matrix F by adopting an RD-DCP algorithm; designing a vector d to meet a power constraint condition and a linear correlation condition; obtaining a generation matrix G through atraversal search method according to the mapping matrix F and the vector d; enabling a sending end user to generate a code word s according to the obtained generation matrix G; and after the code word s reaches a receiver through a fading channel, adopting an MPA iterative decoding algorithm to perform demodulation to acquire a received signal. The method is used for designing the codebook of a 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 Applications(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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