MULTICHANNEL PASSIVE INTERMODULATION DIGITAL CANCELLATION CIRCUIT

Title:

MULTICHANNEL PASSIVE INTERMODULATION DIGITAL CANCELLATION CIRCUIT

Document Type and Number:

WIPO Patent Application WO/2019/080124

Kind Code:

A1

Abstract:

Disclosed in the present invention is a multichannel passive intermodulation (PIM) digital cancellation circuit, comprising a first frequency-shift rate module, a second frequency-shift rate module, a first conversion circuit, a second conversion circuit, a duplexer, a second transmission duplexer, a channel combiner, a third conversion circuit, a cascaded filter circuit, a PIM canceller, a feedback circuit, and a first adder. The cascaded filter circuit compensates for channel responses such as a delay difference and a phase difference generated after a transmitted signal passes through a digital domain downlink, a digital-to-analog converter, and an analog domain downlink; the cascaded filter circuit simulates group delay unevenness characteristics of the duplexer in the multichannel PIM digital cancellation circuit; a cascade filter fits the S parameter of the channel combiner in the multichannel PIM digital cancellation circuit, and precisely fits the combining process of the channel combiner in a digital domain, so that in the present invention, signals capable of cancelling PIM interference signals during multi-transmission and multi-reception of a radio frequency system comprising the channel combiner are generated.

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Inventors:

WANG HAO (CN)
CHEN YINGYING (CN)
LUO YUPING (CN)

Application Number:

PCT/CN2017/108128

Publication Date:

May 02, 2019

Filing Date:

October 27, 2017

Export Citation:

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Assignee:

HUAWEI TECH CO LTD (CN)

International Classes:

H04B1/10

Domestic Patent References:

WO2015085547A1

2015-06-18

Foreign References:

CN107271769A	2017-10-20
CN106849970A	2017-06-13

Other References: