Multi-channel Passive Intermodulation Digital Cancellation Circuit
A digital offset and multi-channel technology, applied in electrical components, wireless communications, equalizers, etc., can solve the problem that multi-transmission PIM interference signals cannot be offset
Active Publication Date: 2021-09-14
HUAWEI TECH CO LTD
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Problems solved by technology
[0004] The embodiment of the present invention discloses a multi-channel passive intermodulation digital cancellation circuit, which can solve the problem that the PIM interference signal of the radio frequency system in the multi-transmission and reception of the combiner in the form of an electric bridge and a V network structure cannot be cancelled. question
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[0067] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.
[0068] see figure 1 , figure 1 A schematic structural diagram of a multi-channel digital PIM cancellation circuit provided by an embodiment of the present invention. Such as figure 1 As shown, the multi-channel PIM digital cancellation circuit includes: .
[0069] The first frequency shift variable rate module 101, the first memory 102, the first conversion circuit 103, the duplexer 104, the channel combiner 105, the second frequency shift variable rate module 106, the second memory 107, and the second conversion circuit 108 , a second transmit duplexer 109 , a cascaded filter circuit 110 , a PIM canceller 111 , a third conversion circuit 112 , a feedback circuit 113 and a first adder 114 .
[0070] Wherein, the input port of the above-mentioned first frequency-shifting va...
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The invention discloses a multi-channel PIM digital cancellation circuit, comprising: a first frequency-shifting and rate-changing module, a second frequency-shifting and rate-changing module, a first conversion circuit, a second conversion circuit, a duplexer, and 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. Among them, the cascade filter circuit compensates the channel response such as time delay difference and phase difference generated after the transmitted signal passes through the digital domain downlink, digital-to-analog converter and analog domain downlink; the cascade filter circuit simulates multi-channel PIM digital The group delay non-flat characteristics of the duplexer in the cancellation circuit; the cascade filter fits the S-parameters of the channel combiner in the multi-channel PIM digital cancellation circuit, and the combining process of the channel combiner is performed in the digital domain. The precise fitting finally enables the present invention to generate a signal that can cancel the PIM interference signal of the radio frequency system in the multi-transmission and reception including the channel combiner.
Description
technical field [0001] This application relates to the field of passive intermodulation cancellation, in particular to a multi-channel passive intermodulation digital cancellation circuit Background technique [0002] In the Frequency Division Duplexing (FDD) multi-carrier base station communication system, in the multi-carrier and large transmission bandwidth scenario, the antenna feeder system will generate passive intermodulation ( Passive Inter Modulation (PIM) interference signal, when the frequency point of the PIM interference signal falls within the receiving frequency band, it will overlap or expand the spectrum of the received signal, seriously affecting the receiving sensitivity of the base station system, and further affecting the network uplink throughput. [0003] Based on the above problems, in the prior art, a PIM canceller is proposed. The PIM canceller can perform non-linear modeling and cancel the PIM interference signal falling into the receiving frequen...
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IPC IPC(8): H04B1/10
CPCH04B1/10H04B1/525H04W88/085Y02D30/70H04B1/123H04L27/01
Inventor 王昊陈莹莹罗宇平
Owner HUAWEI TECH CO LTD