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Passive intermodulation interference cancellation system and method based on double-delay estimation

A technology for interference cancellation and time delay estimation, applied in transmission systems, electrical components, etc., can solve the problems of high passive intermodulation time delay estimation and poor cancellation effect

Inactive Publication Date: 2017-12-08
北京银河信通科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to solve the defects of passive intermodulation interference existing in existing wireless communication and satellite communication systems, resulting in excessive estimation of passive intermodulation delay and poor passive intermodulation interference cancellation effect, and proposes a A passive intermodulation interference cancellation system and method based on dual delay estimation

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  • Passive intermodulation interference cancellation system and method based on double-delay estimation

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Embodiment 1

[0093] This embodiment specifically expounds the system composition, function realization and flow diagram of applying the present invention "a passive intermodulation interference cancellation system and method based on dual delay estimation" to a communication system.

[0094] figure 1 It is a schematic diagram of the system composition of "a passive intermodulation interference cancellation system and method based on dual delay estimation" in this embodiment. from figure 1 It can be seen from the figure that in this embodiment, PIM interference suppression is accomplished only through digital implementation, and the system has strong adaptability and is easy to realize by hardware.

[0095] The system receives the double time slot signal through the receiving preprocessing module, performs signal preprocessing, outputs the preprocessed pilot frequency slot signal to the PIM reconstruction module and the dual time delay estimation module, and outputs the preprocessed data t...

Embodiment 2

[0137] This embodiment has specifically described the dual delay estimation processing described in Step 5 of the present invention and the dual delay estimation processing adopted in Step F in Embodiment 1 under dual-carrier QPSK modulation, and its flow is as follows image 3 shown. from image 3 It can be seen from the figure that the specific steps of the dual delay estimation process are as follows:

[0138] Step F.1 initialization sequence moment;

[0139] Specifically: perform initialization settings, search delay τ′ 1in =-τ 1max , τ′ 1ed =τ 1max , the number of searches in the cycle i=0, the maximum number of searches L, the median value of the search delay τ 1mid = 0, delay search step value Δτ 1 =τ 1max / 2;

[0140] Step F.2 preparing to reconstruct the PIM interference signal and actually receiving the PIM interference signal;

[0141] Specifically: receiving the pre-processing data time slot receiving signal from the data pre-processing unit, that is, act...

Embodiment 3

[0169] According to the system flow described in Embodiment 1 and the dual-delay estimation process described in Embodiment 2, this embodiment specifically explains the passive intermodulation interference performed by performing steps 1 to 8 of the present invention on dual-carrier QPSK modulated signals Cancellation results, comparison results such as Figure 5 , Image 6 shown.

[0170] Figure 5 In (a), the horizontal axis represents time, and the vertical axis represents signal amplitude; Figure 5 The curve in (a) is the effect comparison before and after cancellation of Wushuang delay estimation processing, in which the dark curve represents the interference signal, and the light curve represents the signal after LMS cancellation. Figure 5 In (b), the horizontal axis represents time, and the vertical axis represents signal amplitude; Figure 5 The curve in (b) is the effect comparison before and after cancellation with double delay estimation processing, where the ...

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Abstract

The invention relates to a passive intermodulation interference cancellation system and method based on double-delay estimation, and belongs to the technical field of wireless communication anti-interference. The method comprises steps that: 1) enabling a duplexer to transmit a dual-carrier QPSK modulated downlink signal and then receives a uplink signal; 2) determining whether the received signal is in a pilot time slot and determines whether to jump to the step 3) or the step 6); 3) performing PIM parameter estimation and setting a PIM model parameter; 4) reconstructing a PIM interference signal; 5) performing dual-delay estimation and adjusting the stetting of the PIM model parameter setting; 6) enabling a data preprocessing unit to process a data transmission time slot reception signal and to output a resulting signal to an interference cancellation unit, and enabling the cancellation unit to set the PIM model parameter; 7) performing interference cancellation; and 8) determining, according to whether the data transmission time slot is ended, to complete the PIM interference cancellation. The system and method realize dual-carrier PIM interference real-time suppression with sensitive changes and high precision.

Description

technical field [0001] The invention relates to a passive intermodulation interference cancellation system and method based on dual time delay estimation, and belongs to the technical field of signal processing and anti-interference in wireless communication, satellite communication and ground communication systems. Background technique [0002] Passive Intermodulation (PIM for short) refers to the elimination of signals generated when two or more frequency components pass through passive devices (such as duplexers, isolators, coaxial cables, connectors, antennas, loads, etc.) A phenomenon in which there are new frequency components outside the harmonics. The generated new frequency is a linear combination of the fundamental frequency, and interference is formed when the newly generated frequency falls within the passband of the communication receiver. [0003] With the continuous development of wireless communication and satellite communication, the size of the antenna req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/525
CPCH04B1/525
Inventor 梁弼政李林涛胡东方王晓东
Owner 北京银河信通科技有限公司
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