Power distribution method in decellularized large-scale MIMO system based on PZF precoding

A technology of allocation method and precoding scheme, which is applied in the field of power allocation in decellularized massive MIMO system, can solve the problem of not considering the user experience of the downlink system, and achieve the effect of increasing the total rate of users and improving system performance

Active Publication Date: 2021-03-09
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, this solution does not consider the user experience of the entire downlink system

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  • Power distribution method in decellularized large-scale MIMO system based on PZF precoding
  • Power distribution method in decellularized large-scale MIMO system based on PZF precoding
  • Power distribution method in decellularized large-scale MIMO system based on PZF precoding

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[0043] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0044] The invention provides a power allocation method in a decellularized massive MIMO system based on PZF precoding. Such as figure 1 As shown, the method includes the following steps:

[0045] Step (1), establishing a decellularized massive MIMO system model based on PZF precoding.

[0046] In the decellularized massive MIMO system, L APs equipped with M antennas and K single-antenna users are randomly distributed in the service area, and the AP serves users in TDD mode, satisfying LM>>K. It is assumed that all APs in the system are connected to a central processing unit (central processing unit, CPU) through a fronthaul link network, so as to exchange channel state information (CSI). According to the channel hardening characteristic of massive MIMO, the uplink and downlink channels have reciprocity, so the present invention only consider...

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Abstract

The invention provides a power distribution method in a cellular large-scale MIMO system based on PZF precoding, and the method comprises the steps: dividing users into a strong user set and a weak user set according to the strength of channel gain between an AP and each user, employing the PZF precoding for strong user set members, employing the MRT precoding for weak user set members, and obtaining a decellularized large-scale MIMO system model based on PZF precoding; deriving a downlink user rate closed expression according to the system model; establishing an original power optimization problem P1 for maximizing the total rate of downlink users; introducing a slack variable tk, reconstructing the original power optimization problem P1 into an optimization problem P2, converting the optimization problem P2 into a convex optimization problem, and solving the convex optimization problem by using a continuous convex approximation method to obtain an optimal power distribution scheme, namely a suboptimal power distribution scheme of the original optimization problem. Compared with a fixed power distribution scheme, the power distribution method provided by the invention can significantly improve the total rate of downlink users of the system, thereby improving the system performance.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a power allocation method in a decellularized massive MIMO system based on PZF precoding. Background technique [0002] With the rapid development of mobile communications, the demand for traffic continues to grow. Massive multiple-input multiple-output (MIMO) systems can greatly improve the spectral efficiency and energy efficiency of the system, and have been regarded as the key technology of 5G. one. Although this centralized structure can effectively solve the problem of resource consumption on the fronthaul link, its inherent inter-cell interference, frequent handover and coverage problems, especially the coverage of cell edge users, have become a problem for cellular networks. The bottleneck of system performance improvement. In recent years, the emergence of smart terminals and new mobile services has led to a surge in the number of mobile broadband user...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0426H04B7/0456
CPCH04B7/0426H04B7/0456Y02D30/70
Inventor 杨龙祥杨晓萍张尧周猛
Owner NANJING UNIV OF POSTS & TELECOMM
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