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Method and device for performing channel quality indicator estimation

A technology of channel quality indication and channel quality estimation, which is applied in space transmit diversity, baseband system components, diversity/multi-antenna systems, etc., can solve the problems of system throughput decline and deviation, and achieve the effect of accurate CQI

Active Publication Date: 2012-12-05
DATANG MOBILE COMM EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this time, the selected MCS will have a large deviation, resulting in a decrease in system throughput.

Method used

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  • Method and device for performing channel quality indicator estimation
  • Method and device for performing channel quality indicator estimation
  • Method and device for performing channel quality indicator estimation

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Experimental program
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Embodiment Construction

[0022] In the embodiment of the present invention, in the MIMO system, the uplink channel estimation is performed by using the sounding reference signal sent by the user terminal; the user terminal is scheduled according to the uplink channel estimation result, and the user terminal is allocated the time for next transmission. Occupied physical resources; CQI estimation is performed according to uplink channel information of each physical resource allocated for the user terminal. Afterwards, the MCS level of the user terminal corresponding to the obtained CQI can be determined through the set correspondence between the CQI and the MCS level.

[0023] Here, the sounding reference signal may be sent by the user terminal to the base station side at regular intervals. In addition, the user terminal may occupy all or part of the bandwidth to send the sounding reference signal to the base station side.

[0024] The following is attached figure 1 , taking the SU-MIMO system as an e...

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Abstract

The invention discloses a method for performing channel quality indicator (CQI) estimation, which is applied to a multi-input multi-output system. The method comprises the following steps: according to a received sounding reference signal transmitted by a user terminal, performing uplink channel estimation; according to an uplink channel estimation result, scheduling the user terminal, and allocating physical resources to be occupied in next transmission to the user terminal; and according to the uplink channel information of each physical resource, performing the CQI estimation to obtain a CQI. At the same time, the invention also discloses a device for performing the CQI estimation in the multi-input multi-output system. The method and the device can estimate the CQI of any sub-band because the sounding reference signal transmitted by the user terminal can cover the whole bandwidth, estimate the CQI before a user transmits data because the sounding reference signal can be independent of the data transmitted by the user terminal, and obtain the more accurate CQI because the CQI estimation is performed according to the uplink channel information corresponding to the physical resources allocated to the user terminal for the next transmission.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to a method and device for estimating Channel Quality Indicator (CQI) in Multiple Input Multiple Output (MIMO). Background technique [0002] The transmission diversity technology of the MIMO system is to repeatedly send the precoded data stream at the transmitter, so as to obtain diversity gain and coding gain; the spatial multiplexing technology of the MIMO system is to send several different data streams at the transmitter, so that different In the case of increasing the bandwidth, the capacity and spectrum efficiency of the communication system are doubled, which truly reflects the essence of the capacity improvement of the MIMO system, but it requires that the channel can be equivalent to several independent parallel sub-channels, so that there will be no gap between data streams. interfere. [0003] In uplink transmission, in order to achieve a higher peak ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/06H04L25/02
Inventor 陈文洪缪德山拉盖施索士强
Owner DATANG MOBILE COMM EQUIP CO LTD