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Method and system for estimating channel quality

A technology for channel quality estimation and wireless data communication. It is applied in transmission systems, radio transmission systems, diversity/multi-antenna systems, etc. It can solve the problem that data cannot be continuously transmitted, and achieve the effect of reducing time synchronization requirements and improving system throughput.

Active Publication Date: 2011-10-26
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, random beamforming also brings a problem: users in the cell must know their channel quality one or more time slots in advance, and report the channel quality to the base station
[0009] However, the downside of this solution is that the data cannot be transferred continuously

Method used

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  • Method and system for estimating channel quality
  • Method and system for estimating channel quality
  • Method and system for estimating channel quality

Examples

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Embodiment Construction

[0028] As mentioned above, in a multi-user cell communication system based on packet grouping, using random beamforming can bring instantaneous beamforming gain to some users in the cell, and also instantaneously improve the interference characteristics of some users in the cell.

[0029] When stochastic beamforming is applied, at least two transmit antennas (or antenna elements), use beamforming constellations, such as amplitude and relative phase differences between the transmit antennas, to randomly point the antenna beams in a particular direction. After a period of time, for example every time slot or a predetermined number of time slots in a slotted system, the beamforming constellation changes and the beam is thus directed in another direction.

[0030] Also as mentioned above, in order to take full advantage of random beamforming, the system needs to know what channel quality a user will get in a particular time slot using a particular beamforming constellation. Theref...

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Abstract

The present invention relates to a method for channel quality estimation in a wireless data communication system, wherein data streams are transmitted from a transmitter having multiple antennas and / or antenna elements to a receiver over a frequency band, wherein, during a first period of time, data streams are transmitted on at least one sub-band of the frequency band using a first beamforming constellation, and wherein, during a subsequent second period of time, data streams are transmitted on said sub-band using a second beamforming constellation. The method further includes a training step, during the first period of time, wherein a data stream is transmitted on a portion of, or adjacent to, said sub-band while using the beamforming constellation to be used in said second period of time. The present invention also relates to a system, a transmitter and a communication system.

Description

technical field [0001] The present invention relates to a wireless communication system, in particular to a method for estimating channel quality, especially a method for estimating channel quality used in a multi-user cell communication system based on message grouping. Background technique [0002] In a packet-based multi-user cell communication system, such as a multi-user Orthogonal Frequency Division Multiplexing (OFDM) system, a scheduling device is typically used to decide which radio resources are allocated to which users and when. Users report their wireless channel quality to the base station at regular intervals, and the base station makes scheduling decisions based on the respective wireless channel quality reported by each user. The scheduling device may take advantage of the fact that the channels of the users vary independently, that is, when one or more user channels fade, or it may be that when one or more channels assigned to a particular user fade, other c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/06
CPCH04B7/0617H04B7/0695
Inventor 雅普·范·德·比克马蒂尔斯·温斯特姆
Owner HUAWEI TECH CO LTD
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