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A Multi-User Detection Method

A multi-user detection and learning method technology, applied in the field of wireless communication, can solve problems such as multiple access interference, achieve excellent anti-interference performance, effective utilization, and improve system capacity.

Active Publication Date: 2019-12-24
XI AN JIAOTONG UNIV
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Problems solved by technology

[0007] In order to solve the problem of multiple access interference caused by non-orthogonal signals in the NOMA system, the present invention provides an effective multi-user detection method, which performs mixed Gaussian modeling on the noise in the channel

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Embodiment Construction

[0056] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0057] In order to more clearly illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and 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 present invention.

[0058] The scenarios considered here are figure 2 , is a NOMA uplink with 1 base station, K users and N subcarriers. After the base station performs OFDM demodulation processing on the received signal, the received signal of the nth subcarrier can be obtained as:

[0059]

[0060] Among them, g nk represents the channel gain of user k on subcarrier n, s nk Represents the spreading sequence s k The nth component of α k represents the tr...

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Abstract

The invention discloses a detection method for multiple users. The method comprises the following steps: dividing a signal received by a base station into L types according to a GMM (Gaussian MixtureModel) clustering algorithm; building a mixed Gaussian model weighted by L Gaussians for signal noise; and recovering an estimated value of a transmitting signal alpha by using the mixed Gaussian model weighted by the L Gaussians and a 3-layer sparse Bayesian learning method according to the received signal, and outputting the estimated value of the transmitting signal. The detection method for the multiple users takes use of the sparsity of the transmitting signal of the users and the sparity of a disturbance subcarrier to convert the detection problem of the multiple users into a problem onsparse signal recovery, so that the problem of a near-far effect is solved, and a requirement of the system for power control accuracy is lowered; and therefore, uplink frequency spectrum resources can be used more effectively, and the system capacity can be obviously improved.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a multi-user detection method. Background technique [0002] At present, the mainstream of the fourth-generation mobile communication is to adopt an Orthogonal Frequency Division Multiplexing (OFDM for short) system. Orthogonal multiple access requires that the carriers at the transmitting end be orthogonal to each other, reducing interference caused by multipath, but also greatly reducing spectrum utilization. [0003] Non-Orthogonal Multiple Access (NOMA for short) technology is one of the key technologies of the fifth generation mobile communication. Facing the demand for dense mass access and ultra-large capacity of future wireless networks, in the case of limited spectrum resources, non-orthogonal multiple access technology is regarded as the evolution trend and breakthrough direction of the next generation of mobile communications. [0004] Compared with tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7103H04L1/00
CPCH04B1/7103H04L1/0048H04L1/005
Inventor 李锋彭伊婷陈伟
Owner XI AN JIAOTONG UNIV
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