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The invention relates to a pilot and data superposition transmission method of a SCMA multiple access system

A technology for accessing systems and data, applied in transmission systems, baseband systems, digital transmission systems, etc., can solve problems such as reducing system spectrum efficiency, and achieve the effect of ensuring spectrum efficiency and improving accuracy

Active Publication Date: 2018-12-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Application Information

AI Technical Summary

Problems solved by technology

In time-varying channels, in order to improve channel tracking performance, it is necessary to insert pilot sequences into more OFDM symbols, which will reduce the spectral efficiency of the system

Method used

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  • The invention relates to a pilot and data superposition transmission method of a SCMA multiple access system
  • The invention relates to a pilot and data superposition transmission method of a SCMA multiple access system
  • The invention relates to a pilot and data superposition transmission method of a SCMA multiple access system

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Embodiment

[0029] In this example, it is assumed that there are 24 subframes in the SCMA-OFDM system, each subframe has one OFDM symbol, the number of subcarriers of one OFDM symbol is 1024, the number of users is 6, and each user has only one transmitting antenna, the method described Include the following steps:

[0030] The transmitting end:

[0031] Step 1: In the 6th subframe, insert the orthogonal pilot sequence P of 6 users 1 ,...,P 6 .

[0032] Step 2-1: In the 17th subframe, according to figure 1 The pilot design method, every four subcarriers is a unit, the first and second subcarriers in each unit are inserted into the pilot information of user 1, and the third and fourth subcarriers are inserted into the pilot information of user 6, Similarly, data information of other users is inserted according to the SCMA transmission model.

[0033] Step 2-2: In the 18th subframe, follow figure 1 The pilot design method, every four subcarriers is a unit, the first and third subcarri...

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Abstract

The invention belongs to the technical field of wireless communication and relates to a pilot and data superposition transmission method of a SCMA multiple access system. The invention first estimatesthe initial channel information of a plurality of users through a group of orthogonal pilot sequences, and then updates the channel information of different users in a mode of pilots and data superposition of different users. Under this pilot allocation scheme, there is no pilots superposition of different users on each sub-carrier, only data and pilots superposition of different transmitting users, which not only improves the accuracy of channel estimation, but also ensures the spectral efficiency of the system.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a pilot frequency and data superposition transmission method of an SCMA multiple access system. Background technique [0002] Sparse Code Multiple Access (SCMA) is one of Non-orthogonal Multiple Access (NOMA) technologies. At the sending end, the transmission data bits are first mapped to a specific multi-dimensional codeword in the complex domain, and the codewords of multiple users are non-orthogonally superimposed and transmitted on the same resource block through sparse spreading. The receiving end can use this sparsity to perform low-complexity multi-user joint detection, and combine channel information to complete multi-user data demodulation. Because the number of multi-dimensional codewords obtained by the sparse spread spectrum method is significantly larger than the number of resource blocks occupied by the codewords, SCMA improves the transmission capacit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04L25/02
CPCH04L5/0037H04L5/0044H04L5/0048H04L25/0224
Inventor 但黎琳张毅杨杰尤花征
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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