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Large-scale non-orthogonal multi-access method

A non-orthogonal multi-access, large-scale technology, applied in diversity/multi-antenna systems, shaping networks in transmitter/receiver, spatial transmit diversity, etc., can solve the problem of low spectral efficiency, high computational complexity, training Sequence length and other problems, to achieve the effect of low implementation complexity, suppression of interference, and improved performance

Active Publication Date: 2017-08-29
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of long training sequence, low spectrum efficiency and high computational complexity when large-scale users access the above scheme, and propose a large-scale non-orthogonal multiple access method

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  • Large-scale non-orthogonal multi-access method
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  • Large-scale non-orthogonal multi-access method

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Embodiment Construction

[0027] The present invention will be further elaborated and illustrated below in conjunction with the accompanying drawings and specific embodiments.

[0028] The block diagram of non-orthogonal multiple access based on frequency multiplexing multi-antenna system is as follows: figure 1 As shown, the base station has N t One antenna is configured for each mobile terminal. The base station divides mobile users into multiple clusters, and each cluster contains a small number of terminals to reduce the complexity of serial interference cancellation. Mobile users in the same cluster use the same training sequence, while different clusters use mutually orthogonal training sequences, and transmit to the base station on the uplink channel at the same time. The base station uses the minimum mean square error channel estimation method to obtain the equivalent channel state information of each cluster, and designs transmit beams for the signals of each cluster based on the equivalent ...

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Abstract

The invention discloses a large-scale non-orthogonal multi-access method. The method is performed as follows. A base station divides a large number of mobile users wishing to access a wireless network into a plurality of clusters based on the long-term statistic information of a channel wherein each cluster contains a limited number of mobile users so that the mobile terminals could perform serial interference cancellation with low complexity. All the mobile users also launch training to the base station coincidentally. The base station obtains the channel state information of the uplink channel through the channel estimation and converts it into the equivalent channel state information of each cluster. According to the equivalent channel state information, the base station performs superposing and coding to the signals emitted by each cluster, and launches the superposed and coded signals in the form of wave beams so as to reduce the interference among the clusters. After the mobile users receive the signals, the signals from mobile users whose gains in the channel of the same cluster are weak are decoded firstly, then the signals from these mobile users are removed from the receiving signals, and finally, the signals of these mobile users are decoded. The invention provides a simple but effective non-orthogonal multi-access method for broadband mobile communication system for a large number of users to access.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a large-scale non-orthogonal multiple access method. Background technique [0002] With the rise and development of the Internet of Things and mobile Internet, future wireless networks need to support the simultaneous access of large-scale mobile users. In currently widely used orthogonal multiple access technologies, such as time division multiple access (TDMA), frequency division multiple access (FDMA) and code division multiple access (CDMA), a radio resource block only Can be assigned to a mobile terminal. Due to the scarcity of wireless resources, it is difficult for traditional orthogonal multiple access technology to support simultaneous access of a large number of users. Under such circumstances, non-orthogonal multiple access technology has been extensively studied and is not widely considered as one of the key technologies for future broadband wireless communicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0408H04B7/06H04L25/02H04L25/03
CPCH04B7/0408H04B7/0617H04L25/025H04L25/03006
Inventor 陈晓明张朝阳钟财军
Owner ZHEJIANG UNIV