A method for user grouping and power allocation under millimeter wave mimo-noma system

A technology of MIMO-NOMA and user grouping, which is applied in the field of user grouping and power allocation under the millimeter-wave MIMO-NOMA system to achieve the effect of improving the spectral efficiency of the system

Active Publication Date: 2022-07-08
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, each radio frequency chain in this method can only serve two users, and it is not suitable for the situation where the number of users is much larger than that of radio frequency chains

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  • A method for user grouping and power allocation under millimeter wave mimo-noma system
  • A method for user grouping and power allocation under millimeter wave mimo-noma system
  • A method for user grouping and power allocation under millimeter wave mimo-noma system

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Embodiment Construction

[0057] The present invention will be described in further detail below with reference to the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto. Example

[0058] In this embodiment, as figure 1 A single-cell downlink mmWave MIMO-NOMA system is shown, and the system conditions are assumed to be: the base station is equipped with N BS root transmit antenna, N RF A radio frequency chain serving K multi-antenna users. Among them, N BS >>N RF .

[0059] The present invention provides a method for user grouping and power allocation in a millimeter-wave MIMO-NOMA system based on message passing, and the method includes the following steps:

[0060] Step 1: The base station obtains the downlink channel information of the user, and the digital precoder is and equal power distribution Do analog precoding.

[0061] In step 1, the base station obtains the downlink channel information of the user, and the method for pe...

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Abstract

The invention discloses a method for user grouping and power allocation in a millimeter wave MIMO-NOMA system based on message transfer. The method includes steps: (1) a base station acquires downlink channel information of users and performs analog precoding. (2) With the goal of maximizing the weighted sum rate of the system, a user grouping algorithm based on the minimum summation message passing strategy is proposed to obtain the matching result between the user and the radio frequency chain. (3) The zero-forcing digital precoding is used to suppress inter-group interference, and a low-complexity power allocation method is adopted to maximize the weighted sum rate of the system. The invention can effectively improve the system spectrum efficiency, fully utilize the system hardware resources, and can be used for multi-user data transmission.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a user grouping and power allocation method under a millimeter wave MIMO-NOMA system. Background technique [0002] With the explosion of connected devices in communication systems, available radio resources have become extremely scarce, posing unprecedented challenges to the development of fifth-generation (5G) wireless communications. In order to alleviate the shortage of radio resources and improve the transmission rate of communication, a direct method is to use higher frequency band resources. For example, the millimeter wave (mmWave) frequency band from 30 GHz to 300 GHz has been regarded as one of the technologies with great potential due to its ability to provide a wider wireless frequency band. [0003] mmWave also promotes the application of massive multiple-input multiple-output (MIMO) technology, which realizes spatial multiplexing and diversity gain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0417H04B7/06H04B7/0452
CPCH04B7/0443H04B7/0617H04B7/0452Y02D30/70
Inventor 王小明高金玉蒋锐徐友云
Owner NANJING UNIV OF POSTS & TELECOMM
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