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Non-orthogonal multiple access decoding method for power domain

A non-orthogonal multiple access, power domain technology, applied in the field of wireless communication coding and decoding, can solve problems such as increasing the probability of user 1 signal decoding failure, SIC technology error propagation, etc., to achieve the effect of good decoding performance

Active Publication Date: 2017-07-07
LANZHOU UNIVERSITY
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Problems solved by technology

The fifth-generation mobile communication will face massive user access, and the application scenarios of the Internet of Things will put forward higher requirements for system capacity. Orthogonal multiple Traditional orthogonal multiple access technology cannot meet the high-capacity requirements of the fifth-generation mobile communication
If user 1 fails to decode the user 2 signal, the SIC technology will cause error propagation, increasing the probability of user 1 signal decoding failure

Method used

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  • Non-orthogonal multiple access decoding method for power domain
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  • Non-orthogonal multiple access decoding method for power domain

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] A power domain non-orthogonal multiple access decoding method, the implementation steps are as follows:

[0022] Step 1. The base station performs channel coding (for example, low-density parity-check code, Turbo code, polar code, etc.) and modulation on the signals sent to user 1 and user 2 to obtain transmission information symbols and . Determine the transmit power allocated to user 1 and user 2 at the base station and . The base station uses superposition modulation to send signals to user1 and user2.

[0023] Step 2: User 1 receives the signal . Among them, the path gain from base station to user 1 is h 1 , Indicates that the noise power is background Gaussian white noise. User 1 first decodes the information symbol of user 2 , in the traditional method, the signal of user 1 is treated as Gaussian white noise at this ti...

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Abstract

The invention discloses a non-orthogonal multiple access decoding method for a power domain. A superimposed modulation signal (formula) is regarded as an overall constellation diagram, an information symbol X2 is decoded and recovered by utilizing a receiving signal Y1 through a high order modulation soft decoding algorithm, and a signal-to-noise ratio of decoding at this time is (formula). When a channel decoder fails to recover the information symbol X2, the soft decoding information of the obtained information symbol X2 is taken as prior information to assist decoding of an information symbol X1. The method aims at the characteristics of an NOMA system and provides a novel method for decoding at a near user place. The probability of failure of decoding a signal of a user 2 at a place of a user 1 can be reduced, so that the performance of decoding a signal of the user 1 at the place of the user 1 is further improved. The better decoding performance is obtained at the cost of increase of decoding complexity. The method can be also applied to decoding at a far user place.

Description

technical field [0001] The present invention relates to the technical field of wireless communication coding and decoding, in particular to a non-orthogonal multiple access (Non-orthogonal multiple Access, NOMA) access decoding method in the power domain. Background technique [0002] In the second-generation, third-generation and fourth-generation mobile communication technologies, orthogonal multiple access technologies are used, such as time-division multiple access, frequency-division multiple access and code division multiple access. The fifth-generation mobile communication will face massive user access, and the application scenarios of the Internet of Things will put forward higher requirements for system capacity. Orthogonal multiple Traditional orthogonal multiple access technology cannot meet the high-capacity requirements of the fifth-generation mobile communications. From the perspective of multi-user information theory, NOMA access is obviously better than ort...

Claims

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Application Information

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IPC IPC(8): H04J11/00H04L1/00
CPCH04J11/0026H04J11/0063H04L1/0009
Inventor 袁磊潘杰袁琳
Owner LANZHOU UNIVERSITY
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