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Intelligent antenna wave beam shaping method and baseband signal processor

A beamforming method and smart antenna technology, applied in the direction of antennas, antenna arrays, baseband system components, etc., can solve the problems of downlink beam misalignment, inaccuracy, and increased downlink interference of other UEs, so as to ensure the quality of downlink services , reduce noise, improve accuracy and effect of shaping gain

Active Publication Date: 2013-06-26
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the actual network operation, it is inevitable that individual antenna paths will fail, and the reduction in the number of antennas will have a negative impact on the downlink beamforming, especially in the case of asymmetrical uplink and downlink of the failed antenna paths. The antenna shaping algorithm based on the symmetrical characteristics of uplink and downlink is bound to be inaccurate
[0013] For example, assuming that there are pairs of antennas numbered 0-7, the uplink path numbered 0 is damaged and the downlink path numbered 7 is damaged due to some reason.
Then, according to the existing beamforming algorithm, during uplink processing, antenna eigenvectors numbered 1-7 will be calculated; during downlink beamforming, uplink antenna eigenvectors numbered 1-7 will be used, but because number 7 If there is a downlink failure, the downlink beamforming can only be performed based on antenna numbers 1-6
It can be seen that when this situation occurs, the uplink is based on a total of 7 antennas numbered 1-7 to obtain the eigenvector, while the downlink is only based on a total of 6 antennas numbered 1-6 for beamforming, which cannot satisfy the beamforming principle The principle of uplink and downlink symmetry that needs to be satisfied
[0014] It can be seen that in the case of some antenna failures, if the existing beamforming algorithm is used, the downlink beam will not be aligned with the UE, the receiving power of the formed UE will be reduced, and the downlink interference to other UEs will be increased.

Method used

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  • Intelligent antenna wave beam shaping method and baseband signal processor

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Embodiment 1

[0036] The principle of the EBB method is based on the symmetry of the uplink and downlink channels, and the downlink beamforming coefficients are obtained through uplink channel estimation and the use of space matrix characteristics. Antenna calibration is carried out in two directions separately. If the failure status of antennas in the two directions of transmission and reception is consistent, the eigenvectors calculated based on the remaining effective antennas in the uplink can be used to calculate the shaping coefficients on the corresponding effective antennas in the downlink. The symmetry of up and down can ensure the shaping effect as much as possible. However, as analyzed above, for the situation where the antenna faults in the two directions of sending and receiving are inconsistent, for example, the number of available uplink antennas is greater than the number of downlink antennas, there will be a situation where only part of the uplink information is used for dow...

Embodiment 2

[0060] The principle of the GOB algorithm is to pre-calculate the shaping coefficients of multiple antennas with fixed-directional beams and store them in the list, then calculate the incoming wave direction of the main path of the signal according to certain criteria, and search the shaping coefficients of the outgoing wave direction from the list .

[0061] In a nutshell, the beamforming method in Embodiment 2 is implemented as follows: use the received data of all uplink effective antennas to calculate the angle of arrival AOA, query the preset response vector list based on the AOA, and then obtain the shaping coefficient, and use all An effective downlink antenna performs downlink beamforming.

[0062] see image 3 , is the flow chart of Embodiment 2.

[0063] Embodiment two includes:

[0064] Step 301: According to the antenna parameters, set the corresponding relationship between the uplink incoming wave direction and the response vector of the antenna array;

[0065...

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Abstract

The invention discloses a beam forming method for an intelligent antenna. The method comprises the steps of: acquiring uplink and downlink channel states of each antennae; calculating the uplink data of the antennae with the normal uplink and downlink channel states to obtain a characteristic vector; and taking conjugate to the characteristic vector as a downlink beam forming coefficient. The beam forming method for the intelligent antenna can ensure that users can utilize the rest antennae to perform optimization and adjustment of the downlink beam forming while partial intelligent antenna has failure. The beam forming method for the intelligent antenna can improve the accuracy and the forming gain of the downlink forming, reduce the interferences to non-forming users, and ensure networkdownlink service quality. The invention also provides a baseband signal processor at the same time.

Description

technical field [0001] The present invention relates to the technical field of smart antennas, in particular, it provides a beamforming method for smart antennas and a baseband signal processor for realizing the method. Background technique [0002] Smart Antenna (SA) is a key technology for anti-multipath fading in mobile communication systems. It makes base station (NodeB) transceivers work in selective receiving and transmitting states, reducing multipath fading. Its essence is spatial domain adaptive filtering technology. A smart antenna is generally defined as an antenna array installed on the base station side of a mobile wireless access system. Through a set of fixed antenna units with programmable electronic phase relationships, the signals of each link between the base station and the user equipment (UE) are obtained. directional characteristics. [0003] Smart antennas use beamforming technology to improve spatial filtering effects, and beamforming also has anti-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/04H04B7/06H04B7/08H04L25/02H01Q21/00
Inventor 苏进喜邹素玲牛纲
Owner DATANG MOBILE COMM EQUIP CO LTD