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Uplink and downlink power distributing method of multi-cell multi-user MIMO system

A multi-cell multi-user, allocation method technology, applied in power management, wireless communication, electrical components and other directions, can solve the problem of difficult to obtain accurate instantaneous characteristics of the channel and so on

Active Publication Date: 2015-06-03
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the time-varying nature of wireless channels, it is difficult to obtain accurate instantaneous characteristics of the channel

Method used

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  • Uplink and downlink power distributing method of multi-cell multi-user MIMO system
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  • Uplink and downlink power distributing method of multi-cell multi-user MIMO system

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Embodiment Construction

[0031] Below in conjunction with example the present invention will be further described.

[0032] Consider a multi-cell multi-user MIMO system with L cells, each cell has a base station with M antennas and N randomly distributed single-antenna users. In the actual channel, the large-scale information changes very slowly, so the base station can use the channel statistical characteristic estimation method to obtain the large-scale fading coefficient of the channel Indicates the first l 2 From the nth user to the lth user in a cell 1 The large-scale fading coefficient of a cell base station.

[0033] The i-th cell is considered as the object of power allocation, and the allocated power of other cells is known. First consider the uplink. In the uplink, according to the large-scale fading information, the number of base station antennas M and the number of users in the cell N, the uplink channel condition characterization of the nth user in the i-th cell is obtained

[003...

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Abstract

The invention discloses an uplink and downlink power distributing method of a multi-cell multi-user MIMO system. Uplink and downlink power is distributed to each user according to channel statistical information, and the total system capacity is optimized. The method comprises the following steps: estimating the statistical property of a channel by a base station, calculating the uplink channel state characterization of each user by use of large-scale information, the quantity of antennas of the base station and the quantity of the users, and distributing the power according to the limiting condition of the total transmitting power of an uplink system and different channel characteristics of all the users; and carrying out downlink precoding transmission according to uplink channel information by the base station, calculating the downlink channel state characterization of each user by use of the large-scale information, the quantity of the antennas of the base station and the quantity of the users, and further distributing downlink power according to the limitation of the total transmitting power of a downlink system and different channel characteristics of all the users. The provided power distributing scheme has low complexity, and is simple and feasible, and the acquired channel capacity is very close to the channel capacity acquired by the optimized power distribution.

Description

technical field [0001] The present invention relates to a mobile communication system using multiple sending / receiving antennas to transmit high-speed data, in particular to an uplink and downlink power allocation method applicable in a multi-cell multi-user multi-antenna system. Background technique [0002] In recent years, the demand for wireless data services has grown rapidly, and wireless transmission resources have become increasingly scarce. In order to make full use of spectrum resources, the multi-antenna transmission / reception (MIMO) system has become a key technology in wireless communication systems. Compared with single-antenna transmission, MIMO systems have obvious advantages. Through the transmission of parallel data streams, MIMO can obtain system capacity that increases linearly with the number of transmitting and receiving antennas, and also has the advantages of transmission diversity and higher stability. In order to further reduce inter-cell interfere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/34
CPCH04W52/346
Inventor 金石张琦朱洪波
Owner SOUTHEAST UNIV