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A Dynamic Nulling Method in Wireless Communication System

A wireless communication system and a nulling technology, applied in the field of dynamic nulling, can solve the problems that the change of interference cannot be tracked in real time, and various types of interference cannot be eliminated.

Inactive Publication Date: 2018-03-09
BEIJING XINWEI TELECOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Due to the diversity of interference in the wireless communication system, using a single nulling processing method to generate a nulling matrix cannot eliminate various types of interference, and the change of interference cannot be tracked in real time

Method used

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  • A Dynamic Nulling Method in Wireless Communication System
  • A Dynamic Nulling Method in Wireless Communication System

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Embodiment Construction

[0017] The specific embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0018] There are two ways to generate null matrix in frequency domain and time domain. The methods in the frequency domain include sub-channel level (multiple subcarriers) nulling and single subcarrier nulling; the methods in the time domain include single-frame generation nulling matrix and multi-frame smoothing generation nulling matrix. Generally speaking, for interference with low power or channel characteristics that cannot be accurately obtained (such as common noise interference), it is inclined to use multi-frame smoothing or channel characteristics of multiple sub-carriers to extract stable features of the interference signal to generate a null-sag matrix (denoted as method 1), and for interference with high power and accurate channel characteristics (such as interference from SDMA users paired with it in the base station), it tend...

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Abstract

The invention provides a dynamic zero-trap method in a wireless communication system. The dynamic zero-trap method includes: supporting two zero-trap modes by means of using multiframe smooth or multi-subcarrier channel characteristics to generate a zero-trap matrix and using single-frame and single-subcarrier channel characteristics to generate the zero-trap matrix; performing judgment on interference characteristics, and if interference power is lower or the interference channel characteristics cannot be accurately acquired, adopting the mode of using the multiframe smooth or multi-subcarrier channel characteristics to perform zero-trap processing; if the interference power is higher and the interference channel characteristics can be accurately acquired, adopting the mode of using the single-frame and single-subcarrier channel characteristics to perform zero-trap processing. The interference of different signal strength and channel characteristics inside and outside the wireless communication system can be restrained through the adaptive zero-trap matrix generation method.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a dynamic nulling method in a wireless communication system. Background technique [0002] Smart antennas use array antenna technology and digital signal processing methods to form main beams in the direction of useful signals and null traps in the direction of interference according to the signal space characteristics of different users, thereby improving the performance of the wireless system. In the wireless communication system, there are various types of interference outside the system and within the system, and the strength and signal characteristics of the interference are also different. The extraction and processing of the interference signal characteristics are the key to the nulling technology. Due to the diversity of interference in the wireless communication system, using a single nulling processing method to generate a nulling matrix cannot eliminate various ty...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L25/03H04B7/04
CPCH04B7/0413H04L1/0637H04L25/03019
Inventor 俞岚黄其华董付现
Owner BEIJING XINWEI TELECOM TECH
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