CN109347498B - Interference cancellation device for very high frequency radio station - Google Patents
Interference cancellation device for very high frequency radio station Download PDFInfo
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- CN109347498B CN109347498B CN201811155077.0A CN201811155077A CN109347498B CN 109347498 B CN109347498 B CN 109347498B CN 201811155077 A CN201811155077 A CN 201811155077A CN 109347498 B CN109347498 B CN 109347498B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B2001/1045—Adjacent-channel interference
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Abstract
The invention provides an interference cancellation device for a very high frequency radio station, which comprises a receiving and transmitting switching module, an interference sampling module, an interference cancellation module, a synthesis and feedback module and a control module, wherein the receiving and transmitting switching module is used for receiving and transmitting a signal; the input end of the receiving and transmitting switching module is connected with an antenna and a radio station. The input end of the control module receives a receiving and transmitting signal of the radio station and is used for monitoring the receiving and transmitting state of the radio station in real time; the receiving and transmitting switching module respectively connects the interference sampling module and the synthesizing and feedback module between the radio station and the antenna in series for interference sampling and interference cancellation when the radio station transmits and receives according to the receiving and transmitting state instruction of the very high frequency radio station provided by the control module; the interference sampling module is used for sampling a radio station transmitting signal; the interference cancellation module is used for generating a radio frequency cancellation signal; the synthesis and feedback module is used for synthesizing the interference signal and the cancellation signal and sampling the synthesized error signal. The invention eliminates the adjacent channel interference and receiver intermodulation interference among a plurality of VHF radio stations.
Description
Technical Field
The invention belongs to the technical field of circuit design and equipment-level electromagnetic compatibility, and particularly relates to an interference cancellation device for a very high frequency radio station.
Background
The very high frequency electromagnetic wave signal has the linear propagation characteristic similar to that of light wave, high stability and less influence of external conditions. The VHF radio station is mainly applied to the fields of broadcast television, military affairs and modern aviation. Particularly in the aviation and military fields, the real-time communication performance requirement of the very high frequency radio station is extremely high. In airport scheduling, the VHF radio station is mainly used for keeping contact with the ground all the time during the flight of the airplane so as to realize airport scheduling. The interference or interruption of the VHF communication between the command tower and the takeoff and landing aircraft can endanger the normal flight order of the flight and even cause serious accidents. In the military field, very high frequency radio stations are often used for line-of-sight communication between moving action stations (such as naval vessels, combat vehicles and the like), and can realize transmission of information such as voice, data, images and the like. In particular, in small mobile combat platforms such as combat vehicles, vhf radio stations are the main, even only, means of communication. Therefore, it is required that a plurality of vhf stations can simultaneously operate to upload and receive wartime information at any time.
Vhf stations typically operate in half duplex, with one vhf station being both the source and the receiver. In the situation of intensive use of the above vhf radio stations, when a plurality of vhf radio stations simultaneously work, the adjacent channel interference of the vhf communication and the intermodulation interference of the receiver are serious, which may cause the situation of communication quality reduction and even the thorough interruption of the communication signal. The traditional electromagnetic interference control strategy belongs to a passive interference suppression method, and electromagnetic interference is avoided mainly by methods of transmission channel suppression, space separation, frequency division, time separation and the like. Correspondingly, the main method for solving the interference problem between the vhf stations at present is to enlarge the antenna spacing and perform management control measures such as frequency division and time division. Under the condition of limited space, the effect of enlarging the antenna distance is limited; the control measures such as frequency division and time division affect the practical use, and signal missing reporting and receiving are easily caused.
The self-adaptive radiation interference cancellation technology is an effective technical approach for solving the interference problem between the very high frequency radio stations. The self-adaptive interference cancellation device can self-adaptively track and filter one or more adjacent channel interference signals entering the receiver by utilizing the correlation between the interference signals and the reference signals, and also can eliminate the intermodulation interference of the receiver. The existing VHF radio stations largely use the same-port form of a transmitting-receiving antenna, so that one radio station is an interference source and sensitive equipment. When the radio frequency cancellation device is used, interference sampling is required to be carried out at an interface of an antenna and a radio station, and cancellation signal injection is required to be carried out. The interference sampling and cancellation signal injection parts in the existing Chinese patent ultrashort wave electromagnetic interference cancellation device (application number 201010198092.0), a multichannel interference cancellation device (application number 201518001239.6), a co-site coupling interference cancellation device (application number 201518001240.9), a self-adaptive broadband interference cancellation device (application number 201320001505.0), a self-adaptive interference cancellation device and a debugging method thereof (application number 201110223502.7) and the like are respectively connected in series at the ends of a transmitting antenna and a receiving antenna. The patent (application No. 201710846705.9) considers the problem of interference sampling and cancellation signal injection in the transmit-receive co-port antenna, but it is used in the case where multiple stations share a single receive antenna. Since the vhf stations need to transmit data, when a plurality of vhf stations transmit and receive output simultaneously, each station needs to be equipped with an independent antenna. The above inventions are not suitable for handling interference suppression between vhf stations having independent antennas and transmitting and receiving the same ports.
Disclosure of Invention
The present invention is directed to an interference cancellation apparatus for a vhf radio station, so as to eliminate adjacent channel interference and receiver intermodulation interference among multiple vhf radio stations.
The invention provides a very high frequency radio station interference cancellation device, which is characterized by comprising: the device comprises a receiving and transmitting switching module, an interference sampling module, an interference cancellation module, a synthesis and feedback module and a control module; the input end of the receiving and transmitting switching module is connected with N antennas and N radio stations, the interference output end of the receiving and transmitting switching module is connected with the interference input end of the synthesis and feedback module, the error through input end of the receiving and transmitting switching module is respectively connected with the error through output end of the synthesis and feedback module, the transmitting output end of the receiving and transmitting switching module is connected with the sampling input end of the interference sampling module, and the control input end of the receiving and transmitting switching module is connected with the receiving and transmitting switching control output end of the control module; the direct-through output end of the interference sampling module is connected with the transmitting direct-through input end of the receiving and transmitting switching module, and the reference output end of the interference sampling module is connected with the reference input end of the interference cancellation module; the offset output end of the interference offset module is connected with the offset input end of the synthesis and feedback module, and the error input end of the interference offset module is connected with the error feedback output end of the synthesis and feedback module;
the input end of the control module receives the receiving and transmitting signals of the radio stations, and is used for monitoring the receiving and transmitting states of the N radio stations in real time and controlling the receiving and transmitting switching module according to the receiving and transmitting state information of all the radio stations; the receiving and transmitting switching module respectively connects the interference sampling module and the synthesizing and feedback module between the radio station and the antenna in series for interference sampling and interference cancellation when the radio station transmits and receives according to the receiving and transmitting state instruction of the very high frequency radio station provided by the control module; the interference sampling module is used for sampling the signals transmitted by the radio station and distributing the sampled signals to each cancellation channel of the interference cancellation module; the interference cancellation module is used for generating a radio frequency cancellation signal; the synthesis and feedback module is used for synthesizing an interference signal and a cancellation signal and sampling the synthesized error signal;
the receiving and transmitting switching module is provided with N antenna interfaces and N radio station interfaces which are respectively connected with the N antennas and the radio stations in a one-to-one correspondence manner; the receiving and transmitting switching module is provided with N interference output ends which are respectively connected with the N interference input ends of the synthesis and feedback module in a one-to-one correspondence manner; the receiving and transmitting switching module is provided with N error direct-connection input ends which are respectively connected with N error direct-connection output ends of the synthesis and feedback module in a one-to-one correspondence manner; the receiving and transmitting switching module is provided with N transmitting output ends which are respectively connected with N sampling input ends of the interference sampling module in a one-to-one correspondence manner; the receiving and transmitting switching module is provided with N transmitting through input ends which are respectively connected with N sampling through output ends of the interference sampling module in a one-to-one correspondence manner;
the interference sampling module is provided with N sampling through output ends which are respectively connected with N transmitting through input ends of the transceiving switching module in a one-to-one correspondence manner; the interference sampling module is provided with M reference output ends which are respectively connected with the M reference input ends of the interference cancellation module in a one-to-one correspondence manner; when N is equal to 2, taking M as 2; when N is more than 2, taking M as N2;
the 1 st to M th cancellation output ends of the interference cancellation module are respectively connected with the 1 st to M th cancellation input ends of the synthesis and feedback module, and the 1 st to M th error input ends of the interference cancellation module are respectively connected with the 1 st to M th error feedback output ends of the synthesis and feedback module.
In the above technical solution, the transceiver switching module includes N independent transceiver switching sub-modules; each receiving and transmitting switching submodule is provided with an antenna interface, a radio station interface, an interference output end, an error through input end, a transmitting output end, a transmitting through input end and a control input end.
In the above technical solution, the interference sampling module includes N independent rf couplers and a plurality of power dividers; wherein:
the input ends of the N radio frequency couplers are N sampling input ends of the interference sampling module, and the through output ends of the N radio frequency couplers are N sampling through output ends of the interference sampling module; the coupling output ends of the N radio frequency couplers are respectively connected with the input end of the power divider and used for sampling each interference emission source;
the output end of the power divider is connected with the reference input end of the interference cancellation module, and the input N paths of interference coupling sampling signals are distributed to M reference input ends corresponding to the interference cancellation module according to the mutual interference condition among all the radio stations.
In the above technical solution, the interference cancellation module includes M cancellation channels; each path of error input end of the cancellation channel is connected with an error feedback output end of the synthesis and feedback module, and the cancellation output end of the cancellation channel is connected with the cancellation input end corresponding to the synthesis and feedback module according to the mutual interference relationship among the radio stations and is used as a part of the multi-path cancellation signals to synthesize the interference cancellation signals.
In the above technical solution, when N is 2, the combining and feedback module includes 2 combiners, 2 feedback couplers, 2 bandpass filters, 2 input limiters, 2 low-noise amplifiers, and 2 output limiters; wherein the content of the first and second substances,
the first input end of the 2-path synthesizer is the interference input end of the synthesis and feedback module, the second input end of the 2-path synthesizer is the cancellation input end of the synthesis and feedback module, and the output end of the 2-path synthesizer is connected with the input end of the feedback coupler and is used for synthesizing an interference signal and a cancellation signal;
the output end of the output amplitude limiter is the error direct-through output end of the synthesis and feedback module and is used for extracting a cancellation residual signal sample to be used for self-adaptive control of a cancellation channel;
when N is larger than 2, the synthesis and feedback module comprises N paths of synthesizers, N2 paths of synthesizers, N feedback couplers, N bandpass filters, N input amplitude limiters, N low noise amplifiers, N output amplitude limiters and N paths of power dividers; wherein
The N input ends of the N paths of synthesizers are N cancellation input ends of the synthesis and feedback module and are connected with N cancellation output ends of the interference cancellation module, and the N paths of cancellation outputs respectively correspond to different N different emission sources or N different radio stations and are used for synthesizing cancellation signals of different cancellation channels to form cancellation signals capable of canceling multiple interference sources;
the first input end of the 2-path synthesizer is the interference input end of the synthesis and feedback module, the second input end of the 2-path synthesizer is the cancellation input end of the synthesis and feedback module, and the output end of the 2-path synthesizer is connected with the input end of the feedback coupler and is used for synthesizing an interference signal and a cancellation signal;
the coupling output end of the feedback coupler is connected with the input end of the N-path power divider, the through output end of the feedback coupler is connected with the input end of the band-pass filter, the output end of the band-pass filter is connected with the input end of the input amplitude limiter, the output end of the input amplitude limiter is connected with the input end of the low-noise amplifier, the output end of the low-noise amplifier is connected with the input end of the output amplitude limiter, the output end of the output amplitude limiter is the error through output end of the synthesis and feedback module, the output end of the N-path power divider is the error feedback output end of the synthesis and feedback module, the N output ends of the N-path power divider are respectively connected with the N error input ends of the interference cancellation module, and
the input end corresponds to different N different emission sources or N different radio stations respectively and is used for extracting cancellation residual signal samples to be used as adaptive control of the cancellation module.
In the above technical solution, the transceiver switching submodule includes four single-pole double-throw radio frequency switches, which are divided into a first radio frequency switch, a second radio frequency switch, a third radio frequency switch and a fourth radio frequency switch; wherein the content of the first and second substances,
the radio frequency switch comprises a first radio frequency switch, a second radio frequency switch, a third radio frequency switch, a fourth radio frequency switch, a radio station interface, a control module and a control module, wherein the C end of the first radio frequency switch is an antenna interface of the transceiving switching module, the NO end of the first radio frequency switch is connected with the C end of the fourth radio frequency switch, the NC end of the first radio frequency switch is an NC end of the second radio frequency switch, the NO end of the fourth radio frequency switch is a transmitting through input end of the transceiving switching module, the NC end of the fourth radio frequency switch is an interference output end of the transceiving switching module, the C end of the second radio frequency switch is a radio station interface of the transceiving switching module, the NO end of the second radio frequency switch is connected with the C end of the third radio frequency switch, the NO end and the NC end of the third radio frequency switch are respectively a transmitting output end and.
In the above technical solution, when N is equal to 2, the interference sampling module includes 2 independent couplers; wherein
The input end of the coupler is the sampling input end of the interference sampling module, the through output end of the coupler is the sampling through output end of the interference sampling module, and the coupling output end of the coupler is connected with the reference input end of the interference cancellation module and is used for sampling interference signals.
In the above technical solution, the interference sampling module includes N couplers and N power dividers when N is greater than 2; wherein
The input end of the coupler is the sampling input end of the interference sampling module, the through output end of the coupler is the sampling through output end of the interference sampling module, and the coupling output end of the coupler is connected with the input end of an N-path power divider and used for sampling interference signals;
and the output ends of the N power dividers are the output ends of the interference sampling module and are used for distributing the interference sampling signals to each cancellation channel.
In the above technical solution, the interference cancellation module is characterized in that: the device comprises at least M channels, wherein the error input end of each cancellation channel is connected with the error feedback output end of the synthesis and feedback module, and the cancellation output end of each cancellation channel is connected with the cancellation input end of the synthesis and feedback module and used for generating a radio frequency interference cancellation signal.
The invention can be used for eliminating the mutual interference between the radio stations of the same receiving and transmitting port; the invention can be used for eliminating the interference suppression between the very high frequency stations which are provided with independent antennas and have the same receiving and transmitting ports; the invention can eliminate the blocking interference, adjacent channel noise interference and receiver intermodulation interference caused by a plurality of transmitting radio stations entering a receiver, wherein the blocking interference and the adjacent channel noise interference are caused by the transmitting radio station to the adjacent receiving radio station.
Drawings
FIG. 1 is a block diagram of an interference cancellation apparatus for a VHF radio station in an embodiment of the present invention;
FIG. 2 is a block diagram of a transceiver switch module according to an embodiment of the present invention;
FIG. 3 is a block diagram of a transceiver switching submodule according to an embodiment of the present invention;
FIG. 4 is a block diagram of an interference sampling module according to an embodiment of the present invention;
FIG. 5 is a block diagram of another interference sampling module according to an embodiment of the present invention;
fig. 6 is a block diagram of an interference cancellation module according to an embodiment of the present invention;
FIG. 7 is a block diagram of a synthesis and feedback module according to an embodiment of the present invention;
FIG. 8 is a block diagram of another exemplary synthesis and feedback module according to the present invention.
Detailed Description
The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.
Fig. 1 is a block diagram of the structure of an embodiment of the present invention: the device comprises a receiving and transmitting switching module 1, an interference sampling module 2, an interference cancellation module 3, a synthesis and feedback module 4 and a control module 5; wherein
The 1 st to Nth antenna interfaces of the transceiving switching module 1, N is an integer more than or equal to 2, are respectively connected with the 1 st to Nth antennas, the 1 st to Nth radio station interfaces thereof are respectively connected with the 1 st radio station and the Nth radio station, the 1 st to Nth interference output ends thereof are respectively connected with the 1 st to Nth interference input ends of the synthesis and feedback module 4, the 1 st to Nth error through input ends thereof are respectively connected with the 1 st to Nth error through output ends of the synthesis and feedback module 4, the 1 st to Nth emission output ends thereof are respectively connected with the 1 st to Nth sampling input ends of the interference sampling module 2, the 1 st to Nth emission through input ends thereof are respectively connected with the 1 st to Nth through sampling output ends of the synthesis and feedback module 4, and the control input end thereof is connected with the transceiving switching control output end of the control module 5;
the 1 st to Nth sampling input ends of the interference sampling module 2 are respectively connected with the 1 st to Nth transmitting output ends of the transceiving switching module 1, the 1 st to Nth sampling through output ends thereof are respectively connected with the 1 st to Nth transmitting through input ends of the transceiving switching module 1, and the 1 st to Nth sampling through output ends thereof are respectively connected with the 1 st to Nth transmitting through input ends thereof2The reference output end is respectively connected with the 1 st to the N th of the cancellation module 32The reference input end is connected and used for sampling the radio station transmitting signal and distributing the sampling signal to each cancellation channel of the weight module;
1 st to Nth of the interference cancellation module 32The reference input terminal is respectively connected with the 1 st to the Nth of the interference sampling module 22Reference output terminal connected to 1 st to Nth2The cancellation output end is respectively connected with the 1 st to the Nth of the synthesis and feedback module 42The 1 st to the Nth of the cancellation input end of the first transistor are connected2The error input end is respectively connected with the 1 st to the Nth of the synthesis and feedback module 42The error feedback output end is connected and used for generating a radio frequency cancellation signal;
the 1 st to Nth interference input ends of the synthesis and feedback module 4 are respectively connected with the 1 st to Nth interference output ends of the transceiving switching module 2, the 1 st to Nth error through output ends thereof are respectively connected with the 1 st to Nth error through input ends of the transceiving switching module 1, and the 1 st to Nth error through output ends thereof are respectively connected with the 1 st to Nth error through input ends thereof2The cancellation input end is respectively connected with the 1 st to the N th of the interference cancellation module 32The 1 st to the Nth of the cancellation output end are connected2The error feedback output end is respectively connected with the 1 st to the N th of the interference cancellation module 32The error input ends are connected; the device is used for synthesizing an interference signal and a cancellation signal and sampling a synthesized error signal;
the receiving and sending switching control output end of the control module 5 is connected with the control input end of the receiving and sending switching module 1, and the input end of the control module is a receiving and sending switching signal of the radio stations, and is used for monitoring the receiving and sending states of the N radio stations in real time and controlling the receiving and sending switching module according to the receiving and sending state information of all the radio stations;
further, a structural block diagram of an embodiment of the transceiving switching module 1 is shown in fig. 2, and includes N independent transceiving switching sub-modules 11; wherein, the antenna interface of the receiving and dispatching switching submodule 1 is connected with an antenna, the radio interface is connected with a radio, the interference output end is connected with an interference input end of the synthesis and feedback module 4, the error through input end is connected with an error through output end of the synthesis and feedback module 4, the emission output end is connected with a sampling input end of the interference sampling module 2, the emission through input end is connected with a sampling through output end of the interference sampling module 2, and the control input end is connected with the receiving and dispatching switching control output end of the control module 5; wherein:
a structural block diagram of an embodiment of the transceiving switching submodule 11 is shown in fig. 3, and includes four single-pole double-throw radio frequency switches 111 to 114; wherein, a common end (C end) of the radio frequency switch 111 is an antenna interface of the transceiving switching module 1, a normally open end (NO end) of the radio frequency switch 111 is connected with the C end of the radio frequency switch 114, a normally closed end (NC end) of the radio frequency switch 111 is connected with the NC end of the radio frequency switch 112, the NO end of the radio frequency switch 114 is a transmitting through input end of the transceiving switching module 1, the NC end of the radio frequency switch 114 is an interference output end of the transceiving switching module 1, the C end of the radio frequency switch 112 is a radio station interface of the transceiving switching module 1, the NO end of the radio frequency switch 112 is connected with the C end of the radio frequency switch 113, and the NO end and the NC end of the radio frequency switch 113 are respectively a transmitting output end and a through error input end of the transceiving switching module 1;
in this example, when the rf switch 111 and the rf switch 112 are both thrown to the NC terminal, the transceiving switching submodule 11 is in a bypass state, that is, the radio station is directly connected to the antenna through the rf switches 111 and 112; when the radio frequency switches 111, 112, 113 and 114 are all thrown to the NO terminal, the transceiving switching submodule 11 is in a sampling state; when the radio frequency switch 111 is thrown to the NO end, the radio frequency switch 114 is thrown to the NC end, the radio frequency switch 113 is thrown to the NC end, and the radio frequency switch 112 is thrown to the NO end, the transceiving switching submodule 11 is in a cancellation state;
when N is 2, the block diagram of an embodiment of the interference sampling module 2 is shown in fig. 4, and includes 2 independent couplers 21; the input end of the coupling 21 is a sampling input end of the interference sampling module 2, the through output end thereof is a sampling through output end of the interference sampling module 2, and the coupling output end thereof is connected with a reference input end of the interference cancellation module 3 and is used for performing interference sampling on the emission source;
when N > 2, a block diagram of an embodiment of the interference sampling module 2 is shown in fig. 5, and includes N couplers 21 and N power dividers 22; wherein
The input end of the coupling 21 is a sampling input end of the interference sampling module 2, the through output end thereof is a sampling through output end of the interference sampling module 2, and the coupling output end thereof is connected with the input end of an N-path power divider;
the output ends of the N power dividers 22 are the output ends of the interference sampling module 2;
fig. 6 shows a block diagram of an embodiment of the interference cancellation module 3, which includes N2An error input end of the cancellation channel 31 is connected with an error feedback output end of the synthesis and feedback module 4, and a cancellation output end of the cancellation channel is connected with a cancellation input end of the synthesis and feedback module 4, and is used for generating radio frequency interference cancellation signals;
in this example, the cancellation channel may adopt the cancellation channel structure of the patent (application No. 201518001239.6).
When N is 2, the structural block diagram of an embodiment of the combining and feedback module 4 is shown in fig. 7, and includes 2- way combiners 41, 2 feedback couplers 42, 1 bandpass filter 43, 1 input limiter 44, 1 low noise amplifier 45, and 1 output limiter 46; wherein the content of the first and second substances,
a first input end of the 2-way synthesizer 41 is an interference input end of the synthesis and feedback module 4, a second input end thereof is a cancellation input end of the synthesis and feedback module 4, and an output end thereof is connected with an input end of the feedback coupler 42, and is used for synthesizing an interference signal and a cancellation signal;
the coupling output end of the feedback coupler 42 is the error feedback output end of the synthesis and feedback module 4, the through output end of the feedback coupler 42 is connected with the input end of the band-pass filter 43, the output end of the band-pass filter 43 is connected with the input end of the input amplitude limiter 44, the output end of the input amplitude limiter 44 is connected with the input end of the low-noise amplifier 45, the output end of the low-noise amplifier 45 is connected with the input end of the output amplitude limiter 46, and the output end of the output amplitude limiter 46 is the error through output end of the synthesis and feedback module 4, and is used for extracting cancellation residual signal samples to be used for adaptive control of a cancellation channel;
when N > 2, a block diagram of a structure of an embodiment of the synthesis and feedback module 4 is shown in fig. 8, and includes N synthesizers 47, N synthesizers 41 for 2 paths, N feedback couplers 42, N bandpass filters 43, N input limiters 44, N low noise amplifiers 45, N output limiters 46, and N power dividers 48 for N paths; wherein
N input ends of the N-path synthesizer 47, that is, N cancellation input ends of the synthesis and feedback module 4, are connected to N cancellation output ends of the interference cancellation module, and the N-path cancellation outputs respectively correspond to different N different emission sources or N different radio stations, and are used for synthesizing cancellation signals of different cancellation channels to form cancellation signals capable of canceling multiple interference sources;
a first input end of the 2-way synthesizer 41 is an interference input end of the synthesis and feedback module 4, a second input end thereof is a cancellation input end of the synthesis and feedback module 4, and an output end thereof is connected with an input end of the feedback coupler 42, and is used for synthesizing an interference signal and a cancellation signal;
the coupling output end of the feedback coupler 42 is connected with the input end of the N-path power divider 48, the through output end of the feedback coupler 42 is connected with the input end of the band-pass filter 43, the output end of the band-pass filter 43 is connected with the input end of the input amplitude limiter 44, the output end of the input amplitude limiter 44 is connected with the input end of the low-noise amplifier 45, the output end of the low-noise amplifier 45 is connected with the input end of the output amplitude limiter 46, the output end of the output amplitude limiter 46 is the error through output end of the synthesis and feedback module 4, the output end of the N-path power divider 48 is the error feedback output end of the synthesis and feedback module 4, N output ends of the N-path power divider 48 are respectively connected with N error input ends of the interference cancellation, and the N error input ends respectively correspond to different N different emission sources or N different radio stations, and are used for extracting cancellation residual signal samples as adaptive control of the cancellation module 3.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (9)
1. An apparatus for very high frequency radio station interference cancellation, comprising: the device comprises a receiving and transmitting switching module, an interference sampling module, an interference cancellation module, a synthesis and feedback module and a control module; the input end of the receiving and transmitting switching module is connected with N antennas and N radio stations, the interference output end of the receiving and transmitting switching module is connected with the interference input end of the synthesis and feedback module, the error through input end of the receiving and transmitting switching module is respectively connected with the error through output end of the synthesis and feedback module, the transmitting output end of the receiving and transmitting switching module is connected with the sampling input end of the interference sampling module, and the control input end of the receiving and transmitting switching module is connected with the receiving and transmitting switching control output end of the control module; the direct-through output end of the interference sampling module is connected with the transmitting direct-through input end of the receiving and transmitting switching module, and the reference output end of the interference sampling module is connected with the reference input end of the interference cancellation module; the offset output end of the interference offset module is connected with the offset input end of the synthesis and feedback module, and the error feedback input end of the interference offset module is connected with the error feedback output end of the synthesis and feedback module;
the input end of the control module receives the receiving and transmitting signals of the radio stations, and is used for monitoring the receiving and transmitting states of the N radio stations in real time and controlling the receiving and transmitting switching module according to the receiving and transmitting state information of all the radio stations; the receiving and transmitting switching module respectively connects the interference sampling module and the synthesizing and feedback module between the radio station and the antenna in series for interference sampling and interference cancellation when the radio station transmits and receives according to the receiving and transmitting state instruction of the very high frequency radio station provided by the control module; the interference sampling module is used for sampling the signals transmitted by the radio station and distributing the sampled signals to each cancellation channel of the interference cancellation module; the interference cancellation module is used for generating a radio frequency cancellation signal; the synthesis and feedback module is used for synthesizing an interference signal and a cancellation signal and sampling the synthesized error signal;
the receiving and transmitting switching module is provided with N antenna interfaces and N radio station interfaces which are respectively connected with the N antennas and the radio stations in a one-to-one correspondence manner; the receiving and transmitting switching module is provided with N interference output ends which are respectively connected with the N interference input ends of the synthesis and feedback module in a one-to-one correspondence manner; the receiving and transmitting switching module is provided with N error direct-connection input ends which are respectively connected with N error direct-connection output ends of the synthesis and feedback module in a one-to-one correspondence manner; the receiving and transmitting switching module is provided with N transmitting output ends which are respectively connected with N sampling input ends of the interference sampling module in a one-to-one correspondence manner; the receiving and transmitting switching module is provided with N transmitting through input ends which are respectively connected with N sampling through output ends of the interference sampling module in a one-to-one correspondence manner;
the interference sampling module is provided with N sampling through output ends which are respectively connected with N transmitting through input ends of the transceiving switching module in a one-to-one correspondence manner; the interference sampling module is provided with M reference output ends which are respectively connected with the M reference input ends of the interference cancellation module in a one-to-one correspondence manner; when N is equal to 2, taking M as 2; when N is more than 2, taking M as N2；
The 1 st to M th cancellation output ends of the interference cancellation module are respectively connected with the 1 st to M th cancellation input ends of the synthesis and feedback module, and the 1 st to M th error feedback input ends of the interference cancellation module are respectively connected with the 1 st to M th error feedback output ends of the synthesis and feedback module.
2. The very high frequency radio station interference cancellation arrangement according to claim 1, wherein said transmit-receive switching module comprises N independent transmit-receive switching sub-modules; each receiving and transmitting switching submodule is provided with an antenna interface, a radio station interface, an interference output end, an error through input end, a transmitting output end, a transmitting through input end and a control input end.
3. The apparatus of claim 2, wherein the interference sampling module comprises N independent rf couplers and several power dividers; wherein:
the input ends of the N radio frequency couplers are N sampling input ends of the interference sampling module, and the through output ends of the N radio frequency couplers are N sampling through output ends of the interference sampling module; the coupling output ends of the N radio frequency couplers are respectively connected with the input end of the power divider and used for sampling each interference emission source;
the output end of the power divider is connected with the reference input end of the interference cancellation module, and the input N paths of interference coupling sampling signals are distributed to M reference input ends corresponding to the interference cancellation module according to the mutual interference condition among all the radio stations.
4. The very high frequency radio station interference cancellation arrangement according to claim 3, wherein said interference cancellation module comprises M cancellation channels; each path of error feedback input end of the cancellation channel is connected with an error feedback output end of the synthesis and feedback module, and the cancellation output end of the cancellation channel is connected with the cancellation input end corresponding to the synthesis and feedback module according to the mutual interference relationship among the radio stations and is used as a part of the multi-path cancellation signals to synthesize interference cancellation signals.
5. The very high frequency radio station interference cancellation device according to claim 4, wherein said combining and feedback module, when N is 2, comprises 2 combiners, 2 feedback couplers, 2 bandpass filters, 2 input limiters, 2 low noise amplifiers, and 2 output limiters; wherein the content of the first and second substances,
the first input end of the 2-path synthesizer is the interference input end of the synthesis and feedback module, the second input end of the 2-path synthesizer is the cancellation input end of the synthesis and feedback module, and the output end of the 2-path synthesizer is connected with the input end of the feedback coupler and is used for synthesizing an interference signal and a cancellation signal;
the output end of the output amplitude limiter is the error direct-through output end of the synthesis and feedback module and is used for extracting a cancellation residual signal sample to be used for self-adaptive control of a cancellation channel;
when N is larger than 2, the synthesis and feedback module comprises N paths of synthesizers, N2 paths of synthesizers, N feedback couplers, N bandpass filters, N input amplitude limiters, N low noise amplifiers, N output amplitude limiters and N paths of power dividers; wherein
The N input ends of the N paths of synthesizers are N cancellation input ends of the synthesis and feedback module and are connected with N cancellation output ends of the interference cancellation module, and the N paths of cancellation outputs respectively correspond to different N different emission sources or N different radio stations and are used for synthesizing cancellation signals of different cancellation channels to form cancellation signals capable of canceling multiple interference sources;
the first input end of the 2-path synthesizer is the interference input end of the synthesis and feedback module, the second input end of the 2-path synthesizer is the cancellation input end of the synthesis and feedback module, and the output end of the 2-path synthesizer is connected with the input end of the feedback coupler and is used for synthesizing an interference signal and a cancellation signal;
the coupling output end of the feedback coupler is connected with the input end of the N-path power divider, the through output end of the feedback coupler is connected with the input end of the band-pass filter, the output end of the band-pass filter is connected with the input end of the input amplitude limiter, the output end of the input amplitude limiter is connected with the input end of the low-noise amplifier, the output end of the low-noise amplifier is connected with the input end of the output amplitude limiter, the output end of the output amplitude limiter is the error through output end of the synthesis and feedback module, the output end of the N-path power divider is the error feedback output end of the synthesis and feedback module, and N outputs of the N-path power
The output ends are respectively connected with N error feedback input ends of the interference cancellation module, and the N error feedback input ends respectively correspond to N different emission sources or N different radio stations and are used for extracting cancellation residual signal samples to be used for adaptive control of the cancellation module.
6. The very high frequency radio station interference cancellation device according to claim 5, wherein said transmit-receive switching submodule comprises four single-pole double-throw radio frequency switches, which are divided into a first radio frequency switch, a second radio frequency switch, a third radio frequency switch and a fourth radio frequency switch; wherein the content of the first and second substances,
the radio frequency switch comprises a first radio frequency switch, a second radio frequency switch, a third radio frequency switch, a fourth radio frequency switch, a radio station interface, a control module and a control module, wherein the C end of the first radio frequency switch is an antenna interface of the transceiving switching module, the NO end of the first radio frequency switch is connected with the C end of the fourth radio frequency switch, the NC end of the first radio frequency switch is an NC end of the second radio frequency switch, the NO end of the fourth radio frequency switch is a transmitting through input end of the transceiving switching module, the NC end of the fourth radio frequency switch is an interference output end of the transceiving switching module, the C end of the second radio frequency switch is a radio station interface of the transceiving switching module, the NO end of the second radio frequency switch is connected with the C end of the third radio frequency switch, the NO end and the NC end of the third radio frequency switch are respectively a transmitting output end and.
7. The very high frequency radio station interference cancellation arrangement according to claim 6, wherein said interference sampling module, when N equals 2, comprises 2 independent couplers; wherein
The input end of the coupler is the sampling input end of the interference sampling module, the through output end of the coupler is the sampling through output end of the interference sampling module, and the coupling output end of the coupler is connected with the reference input end of the interference cancellation module and is used for sampling interference signals.
8. The apparatus of claim 7, wherein the interference sampling module comprises N couplers and N power dividers when N is greater than 2; wherein
The input end of the coupler is the sampling input end of the interference sampling module, the through output end of the coupler is the sampling through output end of the interference sampling module, and the coupling output end of the coupler is connected with the input end of an N-path power divider and used for sampling interference signals;
and the output ends of the N power dividers are the output ends of the interference sampling module and are used for distributing the interference sampling signals to each cancellation channel.
9. The very high frequency radio station interference cancellation arrangement according to claim 8, wherein said interference cancellation module is further configured to: the device comprises at least M channels, wherein the error feedback input end of each cancellation channel is connected with the error feedback output end of the synthesis and feedback module, and the cancellation output end of each cancellation channel is connected with the cancellation input end of the synthesis and feedback module and used for generating radio frequency interference cancellation signals.
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| CN103858355A (en) * | 2013-12-17 | 2014-06-11 | 华为技术有限公司 | Method and device for reducing intermodulation interference |
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| CN107659333B (en) * | 2017-09-19 | 2019-10-22 | 中国人民解放军海军工程大学 | The co-located interference cancellation device in multi-section transceiver radio station |
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