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Symbol detection method and system for acentric non-orthogonal system joint active user

A non-orthogonal, symbolic technology, applied in the field of symbol detection in a non-center non-orthogonal system with active users, and can solve the problems of amplified noise and reduced detection performance.

Active Publication Date: 2020-09-29
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the object of the present invention is to provide a symbol detection method and system for joint active users of a centerless non-orthogonal system, so as to alleviate the influence of noise amplification under low signal-to-noise ratio existing in the prior art, and A technical problem where the detection performance will be significantly degraded in the case of misjudgment of the active user set

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Embodiment 1

[0023] figure 1 It is a flow chart of a method for detecting symbols of joint active users in a centerless non-orthogonal system according to an embodiment of the present invention. The method is applied to a target client, and the target client is a client of a user node of the target communication system. The target The communication system is a centerless non-orthogonal communication system. like figure 1 As shown, the method specifically includes the following steps:

[0024] Step S102, acquiring a target communication signal carrying symbol information; the target communication signal is the sum of communication signals transmitted by at least one user node client.

[0025] Step S104, based on the needle board prior model, determine the active prior probability of each user node in the target communication system.

[0026]Step S106, based on the active prior probability of each user node and the target communication signal, initialize iteration parameters; the iteratio...

Embodiment 2

[0076] The following distance illustrates the simulation detection results of a symbol detection method for joint active users in a centerless non-orthogonal system provided by the present invention.

[0077] Assume that the multi-antenna decentralized network has K=100 independent user nodes, and the number of transmitting antennas for each user node is N T , the number of receiving antennas is N R , user nodes non-orthogonally access the network. The target communication system bandwidth is divided into M subcarriers. The ratio of K / M is defined as the overload factor. There are J=20 active user nodes that are transmitting data, and the active user nodes are randomly grouped, and the size and position of the group are also random. For all simulation results, the elements of the observation matrix H obey independent Gaussian distribution, and the user node bit data adopts BPSK modulation. Normalized Mean Squared Error (NMSE) performance, a series of experiments are conduc...

Embodiment 3

[0081] Figure 5 is a schematic diagram of a centerless non-orthogonal system joint active user symbol detection system provided according to an embodiment of the present invention, the system is applied to a target client, and the target client is a client of a user node of the target communication system, and the target communication The system is a centerless non-orthogonal communication system. like Figure 5 As shown, the system includes: a receiving module 10 , a determining module 20 , an initialization module 30 and an iteration module 40 .

[0082] Specifically, the receiving module 10 is configured to acquire a target communication signal carrying symbol information; the target communication signal is a sum of communication signals transmitted by at least one user node client.

[0083] The determining module 20 is configured to determine the active prior probability of each user node in the target communication system based on the needle board prior model.

[0084...

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Abstract

The invention provides a symbol detection method and system for an acentric non-orthogonal system joint active user, which are applied to a target client, the target client is a client of a user nodeof a target communication system, and the target communication system is an acentric non-orthogonal communication system, and the method comprises the following steps: acquiring a target communicationsignal carrying symbol information; determining an active prior probability of each user node in the target communication system based on a needle plate prior model; initializing iteration parametersbased on the active prior probability of each user node and the target communication signal; and performing iterative computation on the symbol prior mean value based on an iterative relationship between the target communication signal and the iterative parameter until a preset end condition is met to obtain a target symbol mean value. The technical problems that in the prior art, the influence of noise can be amplified under the low signal-to-noise ratio, and the detection performance can be remarkably reduced under the condition that an active user set is misjudged are solved.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a symbol detection method and system for joint active users of a centerless non-orthogonal system. Background technique [0002] The centerless system is a self-organizing network that is not based on fixed facilities. Each node of this type of network communicates through mutual coordination and allocation of resources. It does not depend on the central node. The joining or exit of any node will not affect the communication network and can be quickly deployed. And networking. In non-orthogonal systems, multiple users share the same time-frequency-space resources. The data of multiple users are spread by non-orthogonal codes and then superimposed on each other, and then spread to different transmitting antennas by spatial coding, and there is serious user data interference in the receiver. The symbol detection algorithm is a relatively mature receiver alg...

Claims

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Application Information

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IPC IPC(8): H04B7/0413H04B1/12
CPCH04B1/12H04B7/0413
Inventor 倪祖耀辛睿匡麟玲张树英刘秉坤
Owner TSINGHUA UNIV