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A method and device for precoding in a multi-user mimo system

A multi-user, precoding technology, applied in the field of precoding in multi-user MIMO systems, can solve the problems of not being able to obtain channel information, co-channel interference, and reduce the amount of precoding calculations

Active Publication Date: 2015-09-02
北京万海云科技有限公司
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Problems solved by technology

[0006] The method and device for precoding in a multi-user MIMO system provided by the present invention solve how to effectively reduce the calculation amount of precoding, and can also perform effective precoding in the case of co-channel interference that cannot obtain channel information The problem

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  • A method and device for precoding in a multi-user mimo system

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Embodiment Construction

[0065] In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0066] For a time division duplex (TDD) system, because the uplink and downlink occupy the same frequency resources, the reciprocity of the uplink and downlink channels can be used for precoding. Among them, in order to benefit from channel reciprocity, it is required that the delay between the time when the input channel is observed and the time when the channel information is used is less than the channel coherence time. The system can obtain user channel information through the received pilot signals of each user. For example, in TD-LTE, it can use demodulated reference pilots and sounding pilots to obtain user channel information for precoding.

[0067] In the MU-MIMO system, the precoded transmission signal of the base station can be expres...

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Abstract

The invention discloses a method and a device for precoding in a multi-user MIMO (multiple input multiple output) system. The method includes receiving pilot signals of users; computing spatial correlation matrixes according to the received pilot signals, and computing guiding matrixes of expected users according to the received pilot signals and pilot signals transmitted by the users; and computing precoding matrixes of the expected users according to inverses of the spatial correlation matrixes and the guiding matrixes. The method and the device have the advantages that computational complexity of precoding can be effectively reduced, and precoding also can be effectively carried out under the condition of co-channel interference which stops acquisition of channel information.

Description

Technical field [0001] The present invention relates to the field of communications, in particular to a method and device for precoding in a multi-user MIMO system. Background technique [0002] The development of wireless communication technology has always revolved around how to improve the transmission rate and quality within the harsh channel environment and limited bandwidth. It has been proven that the most effective way to improve data transmission rate and quality on wireless channels is to use multiple input / multiple output (MIMO) technology, that is, using antenna arrays at the transmitting and / or receiving ends of wireless communication systems for information transmission technology. MIMO technology doubles the capacity and spectrum utilization rate of the communication system without increasing the bandwidth. It is one of the key technologies widely used in the new generation of wireless mobile communication systems. MIMO technology has been used in wireless mobile...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L1/00
Inventor 陈永倩刘文雯
Owner 北京万海云科技有限公司
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