Method for heterogeneous user pilot frequency power optimal distribution in large-scale multi-input multi-output system

A technology for pilot power and optimal allocation, used in power management, wireless communications, electrical components, etc.

Inactive Publication Date: 2014-09-10
SOUTHEAST UNIV
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  • Method for heterogeneous user pilot frequency power optimal distribution in large-scale multi-input multi-output system
  • Method for heterogeneous user pilot frequency power optimal distribution in large-scale multi-input multi-output system
  • Method for heterogeneous user pilot frequency power optimal distribution in large-scale multi-input multi-output system

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[0059] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0060] A heterogeneous user pilot power optimal distribution method in a large-scale MIMO system of the present invention, the scheme includes the following processes:

[0061] Step 1) There is a base station and K heterogeneous users in the cell, use g k =[g 1k , g 2k ,..., g Mk ] T Indicates the channel vector from the kth user in the cell to the base station, where M is the total number of antennas in the base station, k=1, 2, 3...K, the complex transmission coefficient of the kth user terminal in the cell to the mth antenna of the base station for g mk , m is a positive integer, and 1≤m≤M, h mk Indicates the complex fast fading factor from the kth user terminal in the cell to the mth antenna of the base station, β k Indicates the slow fading coefficient of the kth user terminal in the cell to the base station, so-called heterogene...

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Abstract

The invention discloses a method for heterogeneous user pilot frequency power optimal distribution in a large-scale multi-input multi-output system. The method comprises a first step of generating a group of randomly distributed heterogeneous users, enabling each user to undergo independent channel information, and calculating a system downlink achievable speed; a second step of forming a Lagrangian function L by the system downlink achievable speed and total power constraint conditions; a third step of assuming lambda to be a Lagrangian multiplier, performing derivation of L on pilot frequency power rhok and lambda to obtain an expression of rhok related to the lambda and the channel information; a fourth step of obtaining the value range of lambda based on the expression obtained in the third step according to the restrictions that rhok is larger than 0 and smaller than the total power; a fifth step of performing binary search according to the value range of lambda obtained in the fourth step, and obtaining an optimal pilot frequency power distribution value. According to the method, different channel information of the heterogeneous user is utilized to achieve optimal distribution of pilot frequency power, and the overall data transmission performance of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and specifically relates to a method for optimally allocating pilot frequency power of heterogeneous users in a large-scale multiple-input multiple-output system. Background technique [0002] With the increasing user demand for high-speed data services and the increasing number of community users, the mobile communication network has an increasing demand for spectrum resources. Large-scale multi-user MIMO (multi-user MIMO, referred to as: MU-MIMO) system improves system spectrum utilization by increasing the number of base station antennas, and has received widespread attention. The large-scale MU-MIMO system is equipped with far more antennas than the number of users on the base station side, and the cell users are equipped with a single antenna. The base station uses this large number of antennas to serve multiple end users in the same time-frequency resource at the same time. ...

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Application Information

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IPC IPC(8): H04W52/32
Inventor 张华郑心如许威
Owner SOUTHEAST UNIV
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