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User matching method in MIMO transmission and method for confirming match factor

A user pairing and user technology, applied in communication between multiple stations, selection device, radio/inductive link selection arrangement, etc., can solve problems such as different transmission power, reduced channel capacity, and unequal channel power of transmitting antennas , to achieve the effect of flexible adjustment

Inactive Publication Date: 2008-07-16
STATE GRID BEIJING ELECTRIC POWER +1
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Problems solved by technology

Usually, two users with better channel orthogonality are paired so that the two transmitted signals can be separated easily at the receiving end, but the paired users may cause the transmission of the two users due to the use of adaptive power control (APC). The power is different, and the distance from different users to the base station and the path loss may also be different, which will lead to unequal channel power of different transmitting antennas, thereby reducing the channel capacity

Method used

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  • User matching method in MIMO transmission and method for confirming match factor
  • User matching method in MIMO transmission and method for confirming match factor
  • User matching method in MIMO transmission and method for confirming match factor

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Embodiment Construction

[0030] Preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0031] First, the relationship between the channel capacity and the received signal-to-noise ratio and the channel matrix is ​​explained.

[0032] In multi-user MIMO transmission, there are l receiving antennas, and two single-antenna transmitting users send their respective data on the same frequency band according to a certain pairing method, forming a l×2 antenna with the l receiving antennas of the base station. MIMO channel matrix H = ( H i , H j ) = h i 1 h j ...

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Abstract

The invention discloses a user pairing method used in uplink multiuser MIMO (MU-MIMO) transmission and a method for determining user pairing factor in a mobile communication system. The user pairing method includes the following steps: a base station measures user receiving signal to noise ratio and the channel matrix formed by users and a base station end; according to channel capacity, the influence on a system caused by fast fading and slow fading is taken into comprehensive consideration; finally, through calculating user pairing factor, the user who has maximum paring factor with the selected user is chosen to complete pairing with the selected user; moreover, data is transmitted. Both methods can realize maximization of system capacity to a certain degree; meanwhile, through introducing an adjusting factor into a pairing factor formula, the throughput and fairness of a system can be flexibly adjusted.

Description

technical field [0001] The invention relates to user pairing technology in mobile communication, in particular to a user pairing method for multi-user MIMO (MU-MIMO) uplink transmission and a method for determining user pairing factors in mobile communication. Background technique [0002] In general, the channel capacity of a MIMO system increases with min{N Tx , N Rx} and linear growth, so increase min{N Tx , N Rx} That means an increase in channel capacity. In practical systems, it is usually assumed that the number of transmitting antennas is less than or equal to the number of receiving antennas, that is, N Tx ≤N Rx , so in uplink MIMO transmission, when the base station has multiple receiving antennas, min{N can be increased by increasing the number of transmitting antennas at the user end Tx , N Rx}, so as to achieve the purpose of increasing the channel capacity of the system. [0003] In actual uplink single-user MIMO transmission, if the user end uses multi...

Claims

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Application Information

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IPC IPC(8): H04B7/26H04Q7/38
Inventor 于辉杨超陈峰范斌王文博
Owner STATE GRID BEIJING ELECTRIC POWER
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