Method for combining orthogonal multiple access and non-orthogonal multiple access under Cell-free Massive MIMO

A non-orthogonal multiple access technology, which is applied in the field of communication, can solve the problems of low user throughput, poor reliability, and large communication delay, and achieve the best spectral efficiency, shortened pilot length, and high speed.

Inactive Publication Date: 2021-11-26
HARBIN INST OF TECH +1
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Problems solved by technology

However, when using this technology, the user throughput on the edge of the cell is low, the reliability is poor, and the communication delay is large, which has become a limitation for the application of massive MIMO technology

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  • Method for combining orthogonal multiple access and non-orthogonal multiple access under Cell-free Massive MIMO
  • Method for combining orthogonal multiple access and non-orthogonal multiple access under Cell-free Massive MIMO
  • Method for combining orthogonal multiple access and non-orthogonal multiple access under Cell-free Massive MIMO

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[0094] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them; based on this The embodiments in the invention, and all other embodiments obtained by persons of ordinary skill in the art without creative efforts, all belong to the scope of protection of the present invention.

[0095] The current existing methods all discuss the case of K=2. Obviously, it is unreasonable and not flexible enough to force the number of users in each cluster to be equal. We should set the maximum number of users in a cluster K according to the specific number of users and channel-related time. max and stipulate k l ≤K max , where k l is the number of users in the lth cluster.

[0096] We divide all users into L clusters, the number of ...

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Abstract

The invention provides a method for combining orthogonal multiple access and non-orthogonal multiple access under Cell-free Massive MIMO. All users are divided into L clusters, 1 or 2 users are located in each cluster, the users in each cluster use the same pilot frequency, and the users in different clusters use mutually orthogonal pilot frequencies, so that the number of orthogonal pilot frequencies is L; APs are randomly divided into two parts, one part is used for providing services for an OMA user, and the other part is used for providing services for an NOMA user; the downlink data transmission depends on conjugate beam forming, and the spectrum efficiency of the downlink data transmission of the single user is obtained; a power allocation algorithm is used to maximize a power control algorithm P1 of the minimum SINR, and power control is converted into a convex optimization problem P2; the solution of the downlink maximum minimum SINR is found for the convex optimization problem P2 by using a binary search method, orthogonal multiple access and non-orthogonal multiple access are combined according to the specific user number and the channel correlation time condition, and the optimal spectrum efficiency can be obtained under the conditions of different user numbers and correlation time.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a method for combining orthogonal multiple access and non-orthogonal multiple access under Cell-free Massive MIMO. Background technique [0002] (1) Non-orthogonal multiple access, non-orthogonal multiple access is one of the most important core technologies in wireless communication, and multiple access technology has always been a focus of 5G research. The multiple access technology used in the 4G system is Orthogonal Frequency Division Multiple Access (OFDMA), which makes the allocation and utilization of time-frequency resources more reasonable and efficient by dividing subcarriers, thereby Improve communication efficiency and obtain higher communication quality. However, as the number of users continues to grow, access to non-orthogonal shared resources among users has become inevitable. [0003] Non-Orthogonal Multiple Access (NOMA) in the power domain p...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0413H04B7/06
CPCH04B7/0413H04B7/0617Y02D30/70
Inventor 吴少川隋秋怡李壮
Owner HARBIN INST OF TECH
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