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A Downlink User Selection Method for Non-orthogonal Multiple Access System with Limited Feedback

A non-orthogonal multiple access and access system technology, applied in the field of non-orthogonal multiple access, can solve problems such as channel information estimation errors

Inactive Publication Date: 2019-03-01
XI AN JIAOTONG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, in the real system, the channel information estimation itself has errors, and if the sender wants to obtain the channel information, the receiver needs to feedback the quantized channel information through the limited-capacity feedback channel.

Method used

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  • A Downlink User Selection Method for Non-orthogonal Multiple Access System with Limited Feedback
  • A Downlink User Selection Method for Non-orthogonal Multiple Access System with Limited Feedback
  • A Downlink User Selection Method for Non-orthogonal Multiple Access System with Limited Feedback

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with drawings and embodiments.

[0047] see figure 1 As shown, the user selection method for the downlink of the non-orthogonal multiple access system under the limited feedback of the present invention includes the following steps:

[0048] 1) K single-antenna users in the cell obtain their own channel state information CSI through the pilot signal broadcast by the base station, and feed back their quantized CDI and CQI to the base station through a limited feedback channel, and the base station deploys M antennas, M>1, K>2M;

[0049] 2) The base station selects 2M users from the K single-antenna users for transmission according to the received feedback information, wherein the base station first schedules M RBF users and the corresponding M RBF users according to the CQI and CDI fed back by the candidate users. Beamforming vectors, and then match one user for M RBF (Random Beamforming) users (we ca...

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Abstract

The invention provides a user selection method of a non-orthogonal multiple access system downlink under limited feedback. M antennas are arranged at a base station side. K single antenna users are distributed in a cell. All users of a receiving side acquire channel state information via pilot frequency signals broadcasted by a transmitting end, and channel vectors are quantified as channel direction information CDI and channel quality information CQI and then the channel direction information CDI and the channel quality information CQI are fed back to the base station via a limited rate channel. The base station schedules 2M users from K candidate users to perform transmission of the downlink according to the CDI and the CQI fed back by the users, wherein every two of the 2M users form a user cluster, and M user clusters are formed in total. M wave beam forming vectors are adopted to transmit M user clusters in the system and equal power P is allocated for each cluster, wherein each wave beam vector supports one user cluster, each cluster includes two non-orthogonal users, and each user performs intra-cluster power allocation via a power allocation algorithm. The overall throughput of the system is enabled to have obvious advantages in comparison with that of conventional non-orthogonal transmission.

Description

Technical field: [0001] The invention relates to a non-orthogonal multiple access technology in the technical field of 5G mobile communication, and in particular to a user selection method for a downlink of a non-orthogonal multiple access system under limited feedback. Background technique: [0002] With the promotion of Internet +, Internet of Things, and industrial informatization, the demand for mobile and wireless traffic will increase significantly in the future. Therefore, the goal of 5G is also to provide large-capacity, high-speed, and high-efficiency data services to mobile users. In order to make full use of wireless resources, people have explored in frequency dimension, space dimension, time dimension, coding dimension, etc., and proposed corresponding OFDM, MIMO, TDMA, CDMA and other technologies, and have been successfully applied to existing mobile communications system. In addition to opening up new transmission frequency bands, such as 700MHz, people also...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/06H04L1/06H04L5/00
CPCH04B7/0626H04B7/0632H04L1/06H04L5/0057
Inventor 张超刘世梅
Owner XI AN JIAOTONG UNIV
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