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A scma codebook search method based on maximizing the minimum product distance criterion

A technology of distance and product, which is applied in the field of SCMA codebook search based on maximizing the minimum product distance criterion, can solve the problem of codebook design difficulty and achieve the effect of small calculation, simple operation and guaranteed bit error rate performance

Active Publication Date: 2018-04-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that SCMA is more difficult to codebook design and has higher requirements, and proposes a SCMA codebook search method based on maximizing the minimum product distance criterion

Method used

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  • A scma codebook search method based on maximizing the minimum product distance criterion
  • A scma codebook search method based on maximizing the minimum product distance criterion
  • A scma codebook search method based on maximizing the minimum product distance criterion

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specific Embodiment approach 1

[0029] Specific embodiment one: a kind of SCMA codebook searching method based on maximizing the minimum product distance criterion of this embodiment is specifically prepared according to the following steps:

[0030] Step 1. Draw two identical standard QPSK (Quadrature Phase Shift Keying) constellation diagrams, respectively QPSK1 (as shown in Figure 1(a)) and QPSK2 (as shown in Figure 1(b)), the power is a, That is, the distance from each constellation point to the origin is a; (the default power a of standard QPSK (visible in the reference book) is 1, and here I also directly specify it as 1, where the QPSK coordinates will be directly related to the 16-point coordinates obtained later. Because the 16-point coordinates are based on the QPSK coordinates) Among them, there are 4 constellation points in the QPSK constellation diagram, and the 4 constellation points are all on a circle, and the adjacent two constellation points of the 4 constellation points are respectively con...

specific Embodiment approach 2

[0059] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the abscissa of the point in the SCMA constellation diagram of the first 16 points in the two corresponding 16-point SCMA constellation diagrams in step 3 is the first The first two bits B of the point in the 16-point SCMA constellation diagram 1 B 2 (B 1 B 2 Represents a point, such as the x1 axis coordinates in QPSK1 corresponding to 01) as shown in Figure 2(a); the ordinate of the point in the first 16-point SCMA constellation diagram is the point in the first 16-point SCMA constellation diagram last two bits B 3 B 4 The coordinates of the y1 axis corresponding to QPSK2 are shown in Figure 2(b). Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0060] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the abscissa of the point in the SCMA constellation diagram of the second 16 points in the SCMA constellation diagram of two corresponding 16 points in step 3 is the first The first two bits B of the points in the two 16-point SCMA constellation diagrams 1 B 2 (B 1 B 2 Represents a point, such as the x2 axis coordinates in QPSK1 corresponding to 01) as shown in Figure 2(a); the ordinate of the point in the second 16-point SCMA constellation diagram is the point in the second 16-point SCMA constellation diagram last two bits B 3 B 4 The y2-axis coordinate corresponding to QPSK2 is shown in Figure 2(b). Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses an SCMA codebook searching method based on a maximized minimum product distance criterion relating to the SCMA codebook searching method. The invention solves the problem that the design difficulty and the demand of SCMA to a codebook are relatively high. The method comprises steps such as step 1, drawing constellation diagrams QPSK1 and QPSK2; step 2, obtaining rotated QPSK1 and QPSK2 constellation diagrams; step 3, obtaining the position coordinates of every constellation point in two corresponding 16-point SCMA constellation diagrams; step 4, selecting the minimum of the product distance Rij from the calculated product distances Rij; step 5, obtaining the minimum of all minimum product distances Rij; step 6, determining the rotation angle value theta max enabling the Rij to be maximum. The method is applicable to the SCMA codebook searching field.

Description

technical field [0001] The present invention relates to an SCMA codebook search method, in particular to a SCMA codebook search method based on maximizing the minimum product distance criterion. Background technique [0002] Sparse code multiple access (SCMA) is a new type of non-orthogonal multiple access method. It is a high-speed transmission technology proposed by Huawei for high spectrum utilization efficiency. This air interface technology has been listed as a candidate for 5G mobile communication Compared with the traditional multiple access technology, it has the advantages of high capacity, small delay, fast transmission rate, strong anti-multipath ability, and overcomes the short-range effect of CDMA. Compared with the low-density signal (LDS), SCMA adds a codebook design to obtain a certain codebook gain, but at the same time, unlike the traditional constellation point design, SCMA is more difficult to design the codebook , the requirements are higher, and the op...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/34
CPCH04L27/3444
Inventor 韩帅郭诚张佳琪沙学军张中兆
Owner HARBIN INST OF TECH
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