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TDD system base station disturbance null method and system

A base station and null trapping technology, which is applied in the field of null trapping of base station uplink interference from downlink signals of long-distance base stations, can solve problems such as inability to estimate interference, not considered, and high complexity, and achieve the effect of improving estimation accuracy and reducing complexity

Inactive Publication Date: 2013-01-30
BEIJING XINWEI TELECOM TECH
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Problems solved by technology

But this prior knowledge is not available in most of the jamming systems described in the previous section
[0010] In addition, the spatial characteristics of interference can be obtained by using a special signal structure, such as estimating interference by inserting dedicated empty symbols in the channel. In TD-SCDMA system, it can be estimated by using empty Preamble pilot window, while in SCDMA system, it can be estimated by using However, none of these special signal structures can estimate the interference described above. Moreover, since this interference is not considered in the system design, there is no method for estimating this interference in general systems. special symbol
In addition, there is another method to obtain the interference spatial characteristics is blind estimation. Generally, blind estimation has two disadvantages. One is that the complexity is too high, and then enough interference signals are needed to find its statistics.

Method used

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  • TDD system base station disturbance null method and system
  • TDD system base station disturbance null method and system
  • TDD system base station disturbance null method and system

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Embodiment Construction

[0045] The specific implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings, and the specific implementation in SCDMA and TD-SCDMA systems.

[0046] According to the technical scheme described in the present invention, at first, according to the characteristic waveform design correlator of the possible downlink signal of other base stations in this system, adopt this correlator to search correlation peak, determine whether this correlation peak is according to the height of each correlation peak Formed for the downlink signal of the remote base station, if it is, determine the spatial characteristics of the remote base station according to the spatial waveform of the correlation peak, and determine the interference depth t according to the position of the correlation peak I , t I Such as figure 2 shown.

[0047] Figure 5 The process shown is the process of finding the corresponding spatial feat...

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Abstract

This invention provides a method for carrying out zero-trap of interference to up-line signals by the down-line signals of a far distance base station in TDD system including: using a correlator relating to the time character waveform of down-line signals of a far distance base station to carry out search and judgment to related peaks of several symbols before the up empty time sample signal and getting the space waveforms of the several related peaks to determine the maximum interference depth according to the positions of the peaks and getting interference space character vectors based on the space character waveforms and carrying out interference zero-trap to the interfered symbols of the up-link.

Description

technical field [0001] The invention relates to a method for canceling the uplink interference of a base station in the TDD mode of a mobile communication system, in particular to a method for nulling the uplink interference of a long-distance base station downlink signal in a smart antenna system. Background technique [0002] In a TDD wireless communication system, the downlink and uplink use the same frequency, but work in different time slots to avoid mutual interference between uplink and downlink. The size of the guard time slot is related to the coverage area of ​​the base station and the separation distance of the same-frequency base stations. The present invention relates to the interference relationship between the same-frequency base stations at the separation distance. [0003] In the time-division duplex wireless macrocellular communication system, due to the transmission delay, there is a time deviation between the remote base station signal and the local signa...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/04H04B7/26
Inventor 肖业平岳彦生蒋伯峰叶威
Owner BEIJING XINWEI TELECOM TECH
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