Method and device for precoding in multi-user MIMO (multiple input multiple output) system

A multi-user, precoding technology, which is applied in the field of precoding in multi-user MIMO systems, can solve the problems of reducing the amount of precoding calculations, failing to obtain channel information and co-channel interference, etc.

Active Publication Date: 2012-10-03
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 calculat...

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  • Method and device for precoding in multi-user MIMO (multiple input multiple output) system
  • Method and device for precoding in multi-user MIMO (multiple input multiple output) system
  • Method and device for precoding in multi-user MIMO (multiple input multiple output) system

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Embodiment Construction

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

[0066] For a Time Division Duplex (TDD) system, since 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, the delay between the moment of observing the input channel and the moment of using this channel information is required to be less than the channel coherence time. The system can obtain the user's channel information through the received pilot signal of each user. For example, in TD-LTE, the demodulated reference pilot and sounding pilot can be used to obtain the user's channel information for precoding.

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

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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 communication field, in particular to a precoding method and device in a multi-user MIMO system. Background technique [0002] The development of wireless communication technology always revolves around how to improve the transmission rate and quality in the harsh channel environment and limited bandwidth. It has been proven that the most effective way to improve the data transmission rate and quality on wireless channels is to use multiple input / multiple output (MIMO) technology, that is, the use of antenna arrays at the transmitting end and / or receiving end of a wireless communication system for information transmission technology. MIMO technology doubles the capacity and spectrum utilization of the communication system without increasing the bandwidth, and 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 c...

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Application Information

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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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