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Scheduling method and apparatus based on user feedback in multi-user MIMO communication system

A communication system, multi-user technology, applied in the field of scheduling based on user feedback to achieve the effect of performance improvement

Active Publication Date: 2009-02-18
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This means that reducing the number of simultaneous users served by a multi-user MIMO system will reduce the residual CCI, which in turn may lead to an increase in overall capacity

Method used

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  • Scheduling method and apparatus based on user feedback in multi-user MIMO communication system
  • Scheduling method and apparatus based on user feedback in multi-user MIMO communication system
  • Scheduling method and apparatus based on user feedback in multi-user MIMO communication system

Examples

Experimental program
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Effect test

example 1

[0048] Example 1 (CCI measurement results)

[0049] For the CCI measurement criterion, the selected user estimates the CCI power and compares it with the sum of the power of the CCI and the noise to determine whether the CCI is too high. Each user first estimates the power of the desired signal and the interference power from other users. The estimation of interference power requires each user to estimate the equivalent channel obtained by multiplying its own physical channel matrix and other user's precoding matrix. This can be achieved by transmitting dedicated pilots that are orthogonal between users, or by transmitting common pilots and explicit downlink signaling. The user then calculates the average SINR and signal-to-noise ratio (SIR) for its own data stream, and compares the ratio of SINR to SIR with a preset threshold. If the ratio of SINR to SIR is large, it indicates that the interference power occupies a dominant position in the total interference noise power and...

example 2

[0050] Example 2 (total capacity estimation)

[0051] For the total capacity estimation criterion, the selected users predict whether the total capacity will increase or decrease by reducing the number of users. Based on the estimated signal and interference power, each user can estimate the average capacity of each data stream, and by multiplying the total number of data streams by the average capacity of each data stream, the total capacity of all service users can be estimated value. Then, by reducing the interference sources and redistributing the transmission power accordingly, the signal and interference power changes caused by the reduction of the number of users are predicted, and the corresponding capacity changes are estimated. Finally, after comparing the total capacity obtained under different user number assumptions, each user determines whether the current user number should be reduced, and feeds back the result to the sender.

[0052] figure 2 A block diagra...

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Abstract

A method for utilizing user feedback to dispatch user in a wireless multi-user MIMO communication system, including: selecting a user who synchronously receives services in multi-user MIMO transmission by a base station and each data stream number assigned to the selected user as a dispatched result, generating s pre-coding matrix based on obtained dispatched result for selected user; multiplying the pre-coding matrix and user data stream to generate a data sequence after pre-coding; generating a pilot signal for the selected user, and sending the generated pilot signal and the generated pre-coding data sequence to a user end; estimating a signal power and an interfere power when the user end receives the pilot signal, and estimating a noise power; determining whether there is a need to reduce the user number synchronously serviced by the multi-user MIMO communication system based on the obtained signal power, interfere power and noise power, and feeding back the determined result to the base station; adjusting the user number synchronously serviced by the multi-user MIMO communication system by the base station based on the received feedback result.

Description

technical field [0001] The present invention relates to a scheduling method and device based on user feedback in a wireless multi-user MIMO communication system. More specifically, it relates to using user feedback information to improve the non-ideal conditions at the transmitter end in a wireless multi-user MIMO communication system. User feedback-based scheduling method and device for multi-user MIMO performance degradation caused by channel state information (CSI) Background technique [0002] In recent years, multi-antenna multiple-input and multiple-output (MIMO) technology has attracted a lot of attention because it can increase channel capacity, improve channel reliability and reduce bit error rate. The maximum capacity or upper limit of the capacity of the MIMO system increases linearly with the increase of the minimum number of antennas at the transceiver end. Under the same conditions, the capacity of an ordinary smart antenna system that uses multiple antennas o...

Claims

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Application Information

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IPC IPC(8): H04Q7/38H04B7/26
Inventor 吴克颖王磊
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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