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Method and device for evaluating intermodulation interference

A technology to be evaluated for intermodulation interference, applied in the field of communication, can solve problems such as the inability to evaluate intermodulation interference of signals with different carrier bandwidths, and achieve the effect of ensuring safe operation and avoiding intermodulation interference

Active Publication Date: 2012-02-08
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention is proposed for the problem that the intermodulation interference generated by signals with different carrier bandwidths cannot be evaluated. Therefore, the main purpose of the present invention is to provide an evaluation scheme for the intermodulation interference of GU mixed-mode systems to solve the above problems

Method used

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  • Method and device for evaluating intermodulation interference
  • Method and device for evaluating intermodulation interference
  • Method and device for evaluating intermodulation interference

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Evaluate the impact of intermodulation interference on the base station side of the GU mixed-mode system on the GSM system. Combine below Figure 6 The flow of the implementation of this embodiment is described in detail.

[0059] As described in step S602, it is assumed that the transmit power of the GSM carrier is 43dBm and the frequency is 900MHz; the transmit power of the UMTS carrier is 43dBm and the center frequency is 902.6MHz. Divide the UMTS broadband bandwidth into 19 UMTS narrowband bandwidths, and the center frequency of each narrowband signal is 900.8, 901, ..., 904.4MHz, then the power on each UMTS narrowband bandwidth is 43-10×1g(19) = 30.2dBm.

[0060] As described in step S604, according to the IIP3 of the device, that is, the third-order cut-off point of the device input, the intermodulation distortion IMD3=43+30.2-2×IIP3=73.2-2×IIP3 (dBm) when the input signal is 43dBm and 30.2dBm .

[0061] As described in step S606, the 19 narrowband signals of ...

Embodiment 2

[0065] Evaluate the impact of intermodulation interference on the base station side of the GU mixed-mode system on the UMTS system, combined below Figure 6 The flow of the implementation of this embodiment is described in detail.

[0066] As described in step S602, it is assumed that the transmit power of the GSM carrier is 43dBm, the frequency is 900MHz, the transmit power of the UMTS carrier is 43dBm, and the center frequency is 902.6MHz. Divide the UMTS broadband bandwidth into 19 UMTS narrowband bandwidths, and the center frequency of each narrowband signal is 900.8, 901, ..., 904.4MHz, then the power on each UMTS narrowband bandwidth is 43-10×1g(19) = 30.2dBm.

[0067] As described in step S604, according to the IIP3 of the device, that is, the third-order cut-off point of the device input, the intermodulation distortion IMD3=43+30.2-2×IIP3=73.2-2×IIP3 (dBm) when the input signal is 43dBm and 30.2dBm .

[0068] As described in step S606, the 19 narrowband signals of U...

Embodiment 3

[0072] Evaluate the impact of intermodulation interference on the base station side of the GU mixed-mode system on other systems, combined below Figure 6 The flow of the implementation of this embodiment is described in detail.

[0073] As described in step S602, it is assumed that the transmit power of the GSM carrier is 43dBm and the frequency is 900MHz; the transmit power of the UMTS carrier is 43dBm and the center frequency is 902.6MHz. Divide the UMTS broadband bandwidth into 19 UMTS narrowband bandwidths, and the center frequency of each narrowband signal is 900.8, 901, ..., 904.4MHz, then the power on each UMTS narrowband bandwidth is 43-10×1g(19) = 30.2dBm.

[0074] As described in step S604, according to the IIP3 of the device, that is, the third-order cut-off point of the device input, the intermodulation distortion IMD3=43+30.2-2×IIP3=73.2-2×IIP3 (dBm) when the input signal is 43dBm and 30.2dBm .

[0075] As described in step S606, the 19 narrowband signals of UMT...

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Abstract

The invention discloses a method and device for evaluating intermodulation interference. The method includes: dividing the UMTS broadband bandwidth of the general mobile communication system into a plurality of UMTS narrowband bandwidths of the same size according to the global mobile communication GSM bandwidth, and calculating the UMTS narrowband bandwidth. The power; calculate the intermodulation distortion according to the power, and calculate the intermodulation product according to the power and intermodulation distortion; judge whether the intermodulation product falls on the bandwidth of the system to be evaluated, and calculate the intermodulation product according to the intermodulation product falling on the bandwidth of the system to be evaluated Intermodulation interference; determine the impact of the system to be evaluated based on intermodulation interference. The invention avoids the intermodulation interference and ensures the safe operation of the system.

Description

technical field [0001] The present invention relates to the field of communications, in particular to a method and device for evaluating intermodulation interference. Background technique [0002] In Global System of Mobile communication (GSM for short) and Universal Mobile Telecommunications System (UMTS for short) (ie, GU mixed-mode system), the mixed-mode system base station (Base Transceiver Station, referred to as BTS) can transmit GSM and UMTS carrier frequencies while using a transmitter and a power amplifier in the downlink. This kind of hardware sharing can greatly reduce the cost of BTS system equipment, and at the same time use frequency resources more effectively, bringing Considerable economic benefits. [0003] However, when two different frequency signals of GSM and UMTS act on the same nonlinear circuit, they will modulate each other and generate second-order intermodulation distortion (Intermodulation Distortion), third-order intermodulation distortion, etc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W52/34H04B7/005
Inventor 黄伟芳郝瑞晶刘晓东王娟李光远
Owner ZTE CORP
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