CN112350782A - Co-location interference cancellation method - Google Patents
Co-location interference cancellation method Download PDFInfo
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- CN112350782A CN112350782A CN202011334517.6A CN202011334517A CN112350782A CN 112350782 A CN112350782 A CN 112350782A CN 202011334517 A CN202011334517 A CN 202011334517A CN 112350782 A CN112350782 A CN 112350782A
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Abstract
The invention discloses a co-location interference cancellation method, which comprises the following steps: step one, when a wireless terminal transmits a signal, a sampler generates a path of power signal related to the transmitted signal, and then a phase coarse adjustment circuit adjusts the phase of the power signal by 0-20 degrees; step two, the signal power of step one is divided into two routes of I, Q orthogonal signals with equal size by the split phase circuit; thirdly, the central controller controls the two attenuators to output two paths of amplitude-adjustable signals, and then the signals are sent to a combiner to be superposed to obtain a vector signal which is rotatable in direction and adjustable in amplitude and ranges from 0 degrees to 360 degrees; and step four, when the vector signal and the interference on the receiving antenna have the same amplitude and the opposite phase, the interference can be counteracted, and the invention generates a high-power signal with the opposite phase and the same amplitude to counteract the interference, thereby achieving the purpose of eliminating the same-frequency interference signal and improving the wireless communication quality.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a co-location interference cancellation method.
Background
In wireless coverage engineering, in order to increase signal coverage, a plurality of wireless terminals have to be deployed to complete an overlapping area of wireless coverage; available frequency spectrum and channel resource resources are limited, which introduces more serious co-frequency interference to a part of signal coverage areas, causes network packet loss and time delay, causes the wireless communication quality to become quite poor, and solves the problem, and the prior method mainly comprises three methods:
firstly, network optimization is carried out by adopting a cellular deployment mode, channels of adjacent wireless terminals are separated, and the separation distance of the same channel is as far as possible. The mobile and telecommunication adopt professional antenna feeder type coverage, an industrial wireless terminal is connected with 4-8 antennas in a tapping mode through a feeder line, one wireless terminal occupies one channel to cover a floor or the whole floor, and the same frequency interference can be effectively avoided;
secondly, the coverage area of the wireless terminal can be controlled under the condition of not reducing the signal power by adjusting the downward inclination angle phi of the directional antenna, so that the co-frequency interference on other equipment is reduced, or the influence of the co-frequency interference on the wireless terminal is reduced;
the preselection filter is mainly applied to the front end of the radio station, inhibits out-of-band interference, solves the problems of blocking of the radio station, deterioration of receiving performance and the like, and is realized by a double-resonance loop;
however, in the prior art, the generation of co-channel interference is avoided from the system planning level, but the method needs professional equipment or personnel to carry out planning in the initial stage, and the existing co-channel interference cannot be solved; in the second prior art, the coverage area of a cell can be adjusted, and the co-frequency interference on peripheral equipment or the co-frequency interference on the cell per se can be reduced, but the technology depends on the performance of an antenna and is not suitable for personal/family equipment; in the prior art, three frequencies are switched quickly and are smaller than 100us, but the receiving/transmitting frequency interval is required to be larger than 800kHz, and the frequency spectrum utilization rate is low, so that a co-location interference cancellation method is provided.
Disclosure of Invention
The invention aims to provide a co-location interference cancellation method, which generates a high-power signal with opposite phase and same amplitude to be mutually cancelled with interference through 4 main functional modules of a phase coarse adjustment circuit, a phase splitting circuit, an attenuation circuit and a combiner so as to achieve the purpose of eliminating co-frequency interference signals, thereby effectively optimizing the problems of radio station channel blockage, receiving performance deterioration and the like caused by the inhibition of out-of-band interference at the front section of a radio frequency link.
In order to achieve the purpose, the invention provides the following technical scheme: a co-location interference cancellation method comprises a transmitting system, an interference canceller and a receiver, wherein the interference canceller is connected with the transmitting system and the receiver and used for generating a high-power signal with opposite phase and same amplitude to cancel an interference signal, and the co-location interference cancellation method comprises the following steps:
firstly, a transmitter of a wireless terminal generates a path of power signal related to a transmission signal through a sampler when transmitting the signal, and then performs 0-20-degree phase adjustment on the power signal through a coarse phase adjustment circuit;
step two, the phase splitting circuit divides the signal in the step one into two paths of I and Q orthogonal signals with equal size, and outputs the I path reference signal and the Q path reference signal to the correlator at the same time;
thirdly, the central controller controls the two attenuators to output two paths of amplitude-adjustable signals, and then the signals are sent to a combiner to be superposed to obtain a vector signal which is rotatable in direction and adjustable in amplitude and ranges from 0 degrees to 360 degrees;
and step four, when the vector signal is equal to the interference amplitude and opposite to the phase of the interference on the receiving antenna, the interference can be counteracted.
Preferably, the interference canceller includes a coarse phase adjustment module, a phase splitting circuit, an attenuation circuit, a combiner, a correlator, a protection bypass, and an error detection module.
Preferably, the phase coarse adjustment module is connected or disconnected with a radio frequency coaxial line through a switch array, the coaxial lines are cascaded with each other, and the carrier phase is changed by 0-20 degrees.
Preferably, in the phase splitting circuit, the radio frequency signal first passes through the power dividing circuit to generate two paths of signals with equal amplitude and same phase, and then passes through the phase shifter to generate orthogonal signals I and Q with a phase difference of 90 °.
Preferably, the attenuation circuit is composed of a 3-level power dividing and synthesizing circuit and a 7-level attenuation circuit, and can complete 0.25 dB-16 dB stepping attenuation, and the minimum stepping interval is 0.25 dB.
Preferably, the combiner is composed of two stages of synthesis circuits, and first synthesizes the I and Q path signals into a signal reverse to the interference, and then synthesizes the signal with the receiving antenna to cancel the interference, and finally the received signal only has a useful signal.
Preferably, in the second step, the I path and the Q path of reference signals are output to the correlator and then sent to the error detection module for error detection.
The invention provides a co-location interference cancellation method, which has the following beneficial effects:
the invention generates a high-power signal with opposite phase and same amplitude to offset with interference through 4 main functional modules of a phase coarse adjustment circuit, a phase splitting circuit, an attenuation circuit and a combiner, so as to achieve the purpose of eliminating same-frequency interference signals, thereby effectively optimizing the problems of radio station channel blockage, receiving performance deterioration and the like caused by inhibiting out-of-band interference at the front section of a radio frequency link; the invention can effectively avoid the restriction that the receiving/transmitting frequency interval reaches a certain bandwidth due to interference suppression, effectively solve the problem of same frequency interference and improve the wireless communication quality.
Drawings
FIG. 1 is a system architecture of the present invention;
FIG. 2 is a block schematic diagram of an interference canceller of the present invention;
FIG. 3 is a schematic diagram of a coarse phase adjustment module according to the present invention;
FIG. 4 is a circuit diagram of a phase splitter of the present invention;
FIG. 5 is a circuit diagram of a phase shifter of the present invention;
FIG. 6 is a circuit diagram of an attenuator of the present invention;
fig. 7 is a circuit diagram of the combiner of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1 to 7, the present invention provides a technical solution: a co-location interference cancellation method comprises a transmitting system, an interference canceller and a receiver, wherein the interference canceller is connected with the transmitting system and the receiver and used for generating a high-power signal with opposite phase and same amplitude to be cancelled with an interference signal, the interference canceller comprises a phase coarse tuning module, a phase splitting circuit, an attenuation circuit, a combiner, a correlator, a protection bypass and an error detection module, the phase coarse tuning module is connected with the phase splitting circuit, the phase splitting circuit is connected with the attenuation circuit and the correlator, the attenuation circuit is connected with the combiner, the protection bypass is arranged between the combiner and the error detection module, the correlator is connected with the error detection module, the phase coarse tuning module is connected or disconnected with a radio frequency coaxial line through a switch array, the coaxial lines are cascaded with one another to change the carrier phase by 0-20 degrees, when the split-phase circuit works, a radio frequency signal firstly passes through a power dividing circuit to generate two paths of signals with equal amplitude and same phase, and then passes through a phase shifter to generate orthogonal signals I and Q with 90-degree phase difference, the attenuation circuit is composed of a 3-level power dividing and synthesizing circuit and a 7-level attenuation circuit, 0.25 dB-16 dB stepping attenuation can be completed, the minimum stepping interval is 0.25dB, the combiner is composed of two-level synthesizing circuits, the signals of the paths I and Q are synthesized into signals reverse to interference, then the signals are synthesized with a receiving antenna to offset the interference, and finally the received signals only have useful signals.
The co-location interference cancellation method comprises the following steps:
firstly, when a transmitter of a wireless terminal transmits signals, a sampler generates a path of power signals related to the transmitted signals, and then a phase coarse tuning circuit adjusts the phase of the power signals by 0-20 degrees, so that the phase discrimination sensitivity is improved;
step two, the phase splitting circuit divides the signal in the step one into two paths of I and Q orthogonal signals with equal size, and simultaneously outputs the I path reference signal and the Q path reference signal to the correlator, and the correlator carries out correlation detection processing and then conveys the signals to an error detection module for error detection;
thirdly, the central controller controls the two attenuators to output two paths of amplitude-adjustable signals, and then the signals are sent to a combiner to be superposed to obtain a vector signal which is rotatable in direction and adjustable in amplitude and ranges from 0 degrees to 360 degrees;
and step four, when the vector signal and the interference on the receiving antenna have equal amplitude and opposite phase, the interference can be counteracted, and the received signal is not influenced, thereby solving the problem of strong signal interference of the local transmitter to the receiver during duplex work.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A method for canceling co-location interference is characterized by comprising a transmitting system, an interference canceller and a receiver, wherein the interference canceller is connected with the transmitting system and the receiver and is used for generating a high-power signal with opposite phases and same amplitude to cancel the interference signal, and the method for canceling co-location interference comprises the following steps:
firstly, a transmitter of a wireless terminal generates a path of power signal related to a transmission signal through a sampler when transmitting the signal, and then performs 0-20-degree phase adjustment on the power signal through a coarse phase adjustment circuit;
step two, the phase splitting circuit divides the signal in the step one into two paths of I and Q orthogonal signals with equal size, and outputs the I path reference signal and the Q path reference signal to the correlator at the same time;
thirdly, the central controller controls the two attenuators to output two paths of amplitude-adjustable signals, and then the signals are sent to a combiner to be superposed to obtain a vector signal which is rotatable in direction and adjustable in amplitude and ranges from 0 degrees to 360 degrees;
and step four, when the vector signal is equal to the interference amplitude and opposite to the phase of the interference on the receiving antenna, the interference can be counteracted.
2. The method of claim 1, wherein: the interference canceller comprises a phase coarse tuning module, a phase splitting circuit, an attenuation circuit, a combiner, a correlator, a protection bypass and an error detection module.
3. A method according to claim 2, wherein the method further comprises: the phase coarse adjustment module is connected or disconnected with a radio frequency coaxial line through a switch array, the coaxial lines are cascaded, and the carrier phase is changed by 0-20 degrees.
4. A method according to claim 2, wherein the method further comprises: in the phase splitting circuit, a radio frequency signal firstly passes through a power division circuit to generate two paths of signals with equal amplitude and same phase, and then passes through a phase shifter to generate orthogonal signals I and Q with 90-degree phase difference.
5. A method according to claim 2, wherein the method further comprises: the attenuation circuit is composed of a 3-level power dividing and synthesizing circuit and a 7-level attenuation circuit, and can complete 0.25 dB-16 dB stepping attenuation, and the minimum stepping interval is 0.25 dB.
6. A method according to claim 2, wherein the method further comprises: the combiner is composed of two stages of synthesis circuits, I and Q path signals are synthesized into a signal reverse to the interference, and then synthesized with the receiving antenna to offset the interference, and finally the received signal only has useful signals.
7. A method according to claim 2, wherein the method further comprises: in the second step, the I path reference signal and the Q path reference signal are output to the correlator and then are transmitted to the error detection module for error detection.
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| CN202011334517.6A CN112350782A (en) | 2020-11-25 | 2020-11-25 | Co-location interference cancellation method |
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| CN202011334517.6A CN112350782A (en) | 2020-11-25 | 2020-11-25 | Co-location interference cancellation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114157387A (en) * | 2021-11-30 | 2022-03-08 | 湖北工业大学 | Adaptive co-location interference cancellation system with auxiliary channel and method |
| CN114499558A (en) * | 2022-02-16 | 2022-05-13 | 成都市联洲国际技术有限公司 | Same frequency interference cancellation device |
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