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Method for restraining interference in intelligent antenna system

A technology for interference suppression and smart antennas, applied in antennas, transmission systems, transmission noise suppression, etc., can solve problems such as reducing the system's uplink signal-to-noise ratio, and achieve the effects of improving signal-to-noise ratio, improving quality, and improving beamforming

Inactive Publication Date: 2010-07-21
BEIJING XINWEI TELECOM TECH
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Problems solved by technology

[0004] However, in a strong interference environment, the user's spatial characteristics will be affected by the interference spatial characteristics. At this time, the polluted spatial characteristics are used as the user's spatial characteristics. Using this spatial characteristic for beamforming will reduce the uplink signal-to-noise ratio of the system.

Method used

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  • Method for restraining interference in intelligent antenna system
  • Method for restraining interference in intelligent antenna system

Examples

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Effect test

example 1

[0036] First, interference detection is performed, and the code channel m is designated at the base station, and the code channel m will no longer be allocated to users during system operation. That is, the code channel m is always idle, and is specially used for interference detection. The base station despreads the code channel m at a total of 2n+1 synchronous sampling points (n≥3, the value of n depends on the calculation capability and the required precision), respectively shifting n sampling points to the left and right of the uplink synchronous point, and calculates each The weights of the root antennas (Weight), and according to the obtained weights of each antenna, array signal synthesis is performed to obtain the symbol (Symbol) power.

[0037] Secondly, the occupied code channel is processed to obtain the signal spatial characteristics and interference spatial characteristics. Prior to this, the acquisition of the best synchronization point is carried out, including...

example 2

[0044] In addition to judging can be used as image 3 The method shown is the same as in Example 1.

[0045] Such as image 3 As shown, whether to use the interference cancellation algorithm is judged according to the signal-to-interference-noise ratio (SINR). If the maximum SINR of the occupied code channel is less than a certain reference value MxdB, the interference cancellation algorithm is used. Otherwise, the interference cancellation algorithm is not used. The signal-to-interference-noise ratio is the ratio of signal power to interference and noise power, which is a standard for measuring communication quality. SINR = 20 · log 10 ( S I + N ) Calculate, where S is the signal power, I is the interference power, and N is the noise power.

example 3

[0047] First, interference detection is performed, and the code channel m is designated at the base station, and the code channel m will no longer be allocated to users during system operation. That is, the code channel m is always idle, and is specially used for interference detection. The base station despreads the code channel m at a total of 2n+1 synchronous sampling points offset by n sampling points on the left and right sides of the uplink synchronization point, and calculates the weight of each antenna, and according to the obtained Combining the array signals with the weight value, and calculating the symbol (Symbol) power.

[0048] Secondly, the occupied code channel is processed to obtain the signal spatial characteristics and interference spatial characteristics. Including: despreading the occupied code channel at 2n+1 synchronous sampling points, and calculating the weight value of each antenna, as the signal space feature of the occupied code channel (same as Ch...

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Abstract

The method for restraining interference includes steps: detecting interference in pointed code channel m of base station; processing occupied code channel to obtain characters of signal space and interference space in occupied code channel; based on characters of signal space and interference space to carry out determination for restraining interference; calculating zero defective value for occupied code channel needed to carry out interference cancellation algorithm, and then assigning form for upgoing beam; assigning form for upgoing beam directly for occupied code channel without need of carrying out interference cancellation algorithm. The invention increases upgoing SNR, improves assigned form of down going beam, and raises quality of communication. Implementation of the method does not need to increase any training sequence, and other system spending.

Description

technical field [0001] The present invention relates to a wireless communication system, more specifically to a method for interference suppression in a smart antenna system. Background technique [0002] In a wireless communication system, various kinds of interference exist, which seriously affect the call quality of the wireless communication system. For example, the SCDMA (Synchronous Code Multiple Access) wireless communication system works in the frequency band of 1785-1805. In this frequency band, there are GSM-DCS1800 intermodulation interference, microwave communication interference, radio jammer interference, GSM repeater interference, etc. System external interference, in addition, there are SCDMA base stations, mobile phone itself due to failure or out of sync caused by system internal interference. Because SCDMA adopts CDMA (Code Multiple Access) technology, CDMA system is an interference-limited system, and its ability to suppress strong interference is poor. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B15/00H04B7/26H01Q3/26
Inventor 蒋伯峰岳彦生李一鸣
Owner BEIJING XINWEI TELECOM TECH
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