Downlink beam forming method

A beam and direction of arrival technology, applied in the field of downlink beamforming, can solve problems such as the failure of asymmetric traffic channel algorithms and the inability to ensure the accurate pointing of the main lobe of the beam.

Inactive Publication Date: 2009-02-11
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] This method only ensures that the uplink and downlink beam patterns have the same zero point, and cannot guarantee the accurate direction of the main lobe of the beam; and it only has better performance for single-cell symmetric traffic channels, and the algorithm may fail for asymmetric traffic channels

Method used

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Embodiment Construction

[0042] First, explain the idea of ​​the present invention:

[0043] The present invention assumes that the uplink wave arrival angle can be accurately obtained, and at the same time, it is expected that under the condition that there is no strong interference source around the user, according to the obtained wave arrival angle information of the mobile terminal, the beam forming deviation caused by the different uplink and downlink frequencies is corrected at the same time , Forming the downward weight.

[0044] The second step is to explain the scope of application of the present invention:

[0045] An implementation method of the present invention includes the following steps:

[0046] (1) Estimate the direction of arrival angle θ of the mobile terminal based on the uplink reference signal.

[0047] (2) Put the direction of arrival angle θ into the following formula to calculate the uplink receiving weight w u，i :

[0048] w u ...

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Abstract

The invention relates to a downlink waveform forming method, which comprises the following steps: (1.1) estimating a direction-of-arrival angle theta of a mobile terminal; and (1.2) calculating a downlink transmission weight Wd,i according to the direction-of-arrival angle theta and a frequency correction factor fd / fu and shaping, wherein the formula is shown in the chart. The method can acquire direction-of-arrival angle theta by using an uplink reference signal and can eliminate the pointing error of waveform formation caused by the difference of uplink / downlink carrier frequency in an FDD mode through the frequency correction factor fd / fu, thereby ensuring the accurate pointing direction of the main lobe of a downlink wave.

Description

Technical field [0001] The present invention relates to mobile communications and smart antennas, in particular to a downlink beam forming method applicable in both Frequency Division Duplex (abbreviated as FDD) and Time Division Duplex (abbreviated as TDD) modes. Background technique [0002] Beamforming can increase cell coverage, improve link performance for cell edge users, and can eliminate spatial interference and increase system capacity. In the process of beam forming, the arrival angle of the user belongs to the slowly varying channel information, which is the average of the channel information over a period of time. Therefore, in the TDD mode, the uplink and downlink carrier frequencies are the same, and the downlink beamforming weights are generated for downlink beamforming based on the estimated arrival angle direction information of the uplink pilot signal, and then the downlink beamforming is performed. [0003] In the FDD mode, because the uplink and downlink carri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06
Inventor 姜静王衍文
Owner ZTE CORP
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