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Multi-user detection method of non-orthogonal multiple access system based on compressed sensing

A non-orthogonal multiple access, multi-user detection technology, applied in transmission systems, digital transmission systems, forward error control, etc., can solve problems such as poor practicability, inability to obtain the number of active users in the system, and improve accuracy. performance, improve accuracy

Active Publication Date: 2020-02-11
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, in the license-free NOMA uplink transmission system, the BS cannot obtain the number of active users in the system before receiving the data transmitted by the users.
Therefore, it is not practical

Method used

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  • Multi-user detection method of non-orthogonal multiple access system based on compressed sensing
  • Multi-user detection method of non-orthogonal multiple access system based on compressed sensing
  • Multi-user detection method of non-orthogonal multiple access system based on compressed sensing

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Embodiment Construction

[0050] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the invention.

[0051] This embodiment provides a multi-user detection method for a non-orthogonal multiple access system based on compressed sensing, which can be applied to a license-free NOMA uplink transmission system. First, the multi-user detection based on compressed sensing provided in the embodiment The overall structure diagram of the method is described. See figure 1 As shown, the base station includes a preprocessing module and an active user detection module.

[0052] The preprocessing module is used to receive the received signal sent by the user terminal, and obtain an equiva...

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Abstract

The invention discloses a multi-user detection method of a non-orthogonal multiple access system based on compressed sensing. The method can be applied to an unlicensed NOMA uplink transmission system. According to the method, a generalized Dice coefficient matching criterion is used for replacing a traditional inner product matching criterion; multi-user detection can be realized without knowingthe number of active users of the system; the accuracy of the selected user support set is improved; therefore, the accuracy of multi-user detection is improved. Besides, an iteration termination threshold value based on noise energy is set; iteration of the algorithm is effectively terminated in time, under-estimation and over-estimation of the number of active users are avoided, finally, a variable step size mechanism with large step size rapid approaching and small step size accurate approaching is introduced, the multi-user detection rate is increased, and the users can be rapidly and accurately detected in an unlicensed NOMA uplink transmission system.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a multi-user detection method of a non-orthogonal multiple access system based on compressed sensing. Background technique [0002] With the continuous increase in the number of mobile devices and the wide application of the Internet of Things, massive machine-type communication has become an urgent need, but it will be difficult to achieve it with the existing communication system. The reason is that OMA (orthogonal multiple access, orthogonal multiple access) technology It is difficult to meet the large-scale connection of devices and grant-based scheduling will cause a lot of signaling overhead and delay. For this reason, scholars have proposed a Grant-Free NOMA (Grant-Free non-orthogonal multiple access, grant-free non-orthogonal multiple access) system. [0003] In the Grant-Free NOMA system, when there is no data to send, the user terminal will be in a dormant state...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
CPCH04L1/0048H04L1/005
Inventor 王茜竹方冬吴广富何兰
Owner CHONGQING UNIV OF POSTS & TELECOMM
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