Pre-encoded transmission method for MIMO system

A multi-output, multi-input technology, applied in the field of precoding, can solve the problems of large deviation and low spectrum efficiency, and achieve the effect of reducing errors and improving spectrum utilization

Inactive Publication Date: 2009-06-10
NTT DOCOMO INC
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0053] In order to solve the problem of low spectral efficiency due to the large deviation between the feedback combining channel and the real receiving channel in the existi...

Method used

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  • Pre-encoded transmission method for MIMO system
  • Pre-encoded transmission method for MIMO system
  • Pre-encoded transmission method for MIMO system

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Embodiment Construction

[0074] In the precoding transmission method of a MIMO system of the present invention, in the feedback phase, the mobile station uses the MMSE combiner to calculate the channel direction index (CDI) and channel quality information (CQI) of the quantized equivalent channel, and then in the scheduling stage and precoding stage use the feedback information to perform corresponding processing to improve spectrum utilization efficiency.

[0075] Such as figure 1 As shown, the precoding transmission method of the MIMO system of the present invention includes:

[0076] Step 11, since each user does not know the precoding transmission matrix T during feedback, so the real receiver combining vector cannot be obtained and the equivalent channel h k , but in an actual multi-user system, the base station scheduler always tends to select users whose feedback channels are orthogonal to each other, because it can make the interference between users smaller and the capacity relatively larg...

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Abstract

The invention provides a precoding transmission method for a multi-input and multi-output system, which comprises: a mobile station supposes an emission matrix as a unitary matrix, an MMSE receiver is used for signal combination, an equative channel is calculated, CQI and CDI are obtained and are fed back a base station; according to a channel direction index and channel quality information fed by the mobile station, the base station obtains a zero-forcing precoding emission matrix or a regulated zero-forcing precoding emission matrix corresponding to partial or total possible user combination, carries out multiuser scheduling operation and determines the scheduled user combination; and the base station utilizes the zero-forcing precoding emission matrix or the regulated zero-forcing precoding emission matrix corresponding to the scheduled user combination to carry out precoding and emission; and a scheduled user carries out MMSE receiving. The method reduces error of channel feedback, therefore effectively promoting the utilization ratio of frequency spectrum of the system.

Description

technical field [0001] The invention relates to a precoding technology in a multi-user MIMO system, in particular to a precoding transmission method of a multi-user MIMO system. Background technique [0002] Future wireless communication systems are required to provide higher and higher information transmission rates and communication quality. In order to achieve this goal on limited spectrum resources, MIMO (Multi Input Multi Output, Multiple Input Multiple Output) technology has become one of the indispensable means adopted in future wireless communications. [0003] In the MIMO system, the transmitting end uses multiple antennas to transmit signals, and the receiving end uses multiple antennas to receive signals. Studies have shown that compared with traditional single-antenna transmission methods, MIMO technology can significantly increase channel capacity, thereby increasing information transmission rates. [0004] Using a pre-coding (pre-coding) transmission method i...

Claims

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Application Information

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IPC IPC(8): H04B7/06
Inventor 王玮张战加山英俊
Owner NTT DOCOMO INC
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