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Method and device for determining downlink weight vector of multiple pieces of user equipment

A technology of user equipment and weight vector, applied in the field of communication, can solve the problems of user downlink weight vector not conforming to the actual state of the system, no gain or negative gain for spatial multiplexing, etc.

Active Publication Date: 2016-02-03
SHANGHAI HUAWEI TECH CO LTD
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Problems solved by technology

[0004] This application provides a method and device for determining the downlink weight vector of multi-user equipment, with the purpose of solving the problem of no gain or negative gain in spatial multiplexing caused by the fact that the user downlink weight vector does not conform to the actual state of the system

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  • Method and device for determining downlink weight vector of multiple pieces of user equipment
  • Method and device for determining downlink weight vector of multiple pieces of user equipment
  • Method and device for determining downlink weight vector of multiple pieces of user equipment

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Embodiment Construction

[0043] A method and device for determining a downlink weight vector of a multi-user device disclosed in an embodiment of the present application can be applied in a MIMO communication system. The model and parameter relationship of the MIMO communication system are as follows:

[0044] The equivalent transmission matrix defining the downlink MIMO system is as follows:

[0045]

[0046] Then the system transmission model is:

[0047] r=GS+z

[0048] Among them, r is the received signal, G is the equivalent transmission channel, S is the source vector, and z is the additive complex noise. Since it is a downlink scenario, joint reception is not considered.

[0049] Assume that the transmitter can only obtain an estimate of the channel direction of the user equipment It satisfies the following relationship with the true value and estimated value of the channel:

[0050]

[0051] in unknowable.

[0052] Downlink weight vector of user equipment is the final undetermin...

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Abstract

The invention provides a method and a device for determining a downlink weight vector of multiple pieces of user equipment. The method comprises the following steps that: a base station acquires an accuracy alpha<l> of channel state information of each piece of user equipment; the base station determines a value of each element beta<l,i> in a weight projection expected matrix beta according to a relationship between a module value square alpha<2> of accuracy information and a reciprocal (defined in the description) of a total number of transmitting antenna dimensions; and the base station determines the downlink weight vector of each piece of user equipment in the multiple pieces of user equipment according to the weight projection expected matrix beta. According to the method and the device in the embodiment, the accuracy of the channel state information of each piece of user equipment is taken as one of bases for determining the downlink weight vector, so that the determined downlink weight vector is closer to a practical situation of a communication system compared with the prior art in which the accuracy of the channel state information of each piece of user equipment is assumed to be an ideal value, thereby achieving a higher spatial multiplexing gain.

Description

technical field [0001] The present application relates to the communication field, in particular to a method and device for determining downlink weight vectors of multi-user equipment. Background technique [0002] If multiple antennas are used simultaneously at the transmitting end and the receiving end, a multiple input multiple output (Multiple Input Multiple Output, MIMO) system is formed. Existing studies have shown that MIMO systems have higher channel capacity. At the transmitting end, the data stream is divided into multiple sub-data streams and transmitted from different antennas, which can increase the transmission rate without increasing the transmission power and bandwidth. This technology is called spatial multiplexing (spatial multiplexing) technology, and the increase in transmission rate brought about is called spatial multiplexing gain. [0003] Each user participating in spatial multiplexing requires a specific downlink weight vector, and a certain relati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04B7/06
CPCH04B7/0452H04B7/0456H04B7/0626
Inventor 王智鹰蒋培刚
Owner SHANGHAI HUAWEI TECH CO LTD
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