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SCMA optimization codebook design method

A design method, codebook technology, applied in digital transmission systems, electrical components, error prevention, etc.

Active Publication Date: 2017-10-20
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

In SCMA technology, codebook design directly affects the performance of multiple access technology and the complexity of MPA decoding at the receiving end. Therefore, codebook design is an important part of SCMA technology. Although many researchers are committed to SCMA codebook design, However, optimal SCMA codebook design is still an open topic

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Embodiment Construction

[0066] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0067] figure 2 is a Gaussian channel SCMA uplink system model, the bit information of J users is mapped to codewords in the pre-designed SCMA codebook after channel coding, and the information of J users is superimposed on K resource blocks for transmission. After the additive interference of Gaussian white noise in the Gaussian channel, it is received by the receiving end. The Gaussian channel SCMA uplink system model can be expressed as:

[0068]

[0069] where y=[y 1 ,y 2 ,y 3 ,...,y K ] T , x j =[x 1j ,x 2j ,x 3j ,...,x Kj ] T is the transmitted codeword of the jth user, n is a K×1 additive Gaussian white noise vector with a mean value of 0 and a variance of 1; K represents the number of resource blocks. Then the received signal on the kth resource block is:

[0070]

[0071] image 3 is the Rayleigh channel SCMA uplink system model. Compar...

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Abstract

Disclosed is an SCMA (Sparse Code Multiple Access) optimization codebook design method, comprising the following steps: firstly, setting an SCMA codebook parameter; secondly, rotating a QPSK (Quadrature Phase Shift Keying) constellation an angle anticlockwise to maximize the minimum Euclidean distance between projection constellation points of QPSK on two dimensions; thirdly, performing dimensional and point extension on C to obtain a mother constellation C+, and then rotating the C+ to construct a total constellation map c of df users on a single resource block to maximize the minimum Euclidean distance between the users; fourthly, rotating the total constellation anticlockwise to maximize the minimum product distance of each user on the resource block, and then mapping the mother constellation C+ to an SCMA codebook of multiple users with the use of the optimized rotating angle and in combination with a factor matrix F; and finally, in a Rayleigh fading channel, interweaving Q channels of QAM (Quadrature Amplitude Modulation) symbols, obtained by mapping on each resource block, of the users. The SCMA codebook designed by the method has good capability of resisting noise, interference and fading.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to an SCMA optimized codebook calculation method. Background technique [0002] In the development history of mobile communication, the development of each generation of mobile communication system is accompanied by the evolution of multiple access technology. 1G-4G mobile communication systems use the frequency domain, time domain, code domain and orthogonal multiple access methods in the time-frequency domain to distinguish multi-user messages. Compared with the existing 4G in the future, the spectral efficiency of 5G needs to be increased by 5 to 15 times, and the connection density needs to be increased by more than 10 times. In addition, the delay requirement of some scenarios needs to reach the order of milliseconds, and at the same time, it needs to be close to 100%. reliable communication. Orthogonal Multiple Access (OMA) cannot meet the requirements of 5G for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/34H04L1/00
CPCH04L1/0071H04L27/3444
Inventor 景小荣陶红宝
Owner CHONGQING UNIV OF POSTS & TELECOMM
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