CN102611469B - A kind of phase-shift filtering method - Google Patents
A kind of phase-shift filtering method Download PDFInfo
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- CN102611469B CN102611469B CN201210039511.5A CN201210039511A CN102611469B CN 102611469 B CN102611469 B CN 102611469B CN 201210039511 A CN201210039511 A CN 201210039511A CN 102611469 B CN102611469 B CN 102611469B
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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
- H04B1/12—Neutralising, balancing, or compensation arrangements
- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
Abstract
The present invention discloses a kind of phase-shift filtering method, for solving the problem of the frequency interferences communication channel communication that communication channel is closed on. The present invention is in receiving system, use phase adjustment block to input the phase differential of the signal in port in designated frequency band and outside designated frequency band to two to regulate, making the phase differential in the frequency range specified be 0 degree, the phase differential outside designated frequency band is 180 degree; Or the phase differential in the frequency range specified is 180 degree, phase differential outside designated frequency band is 0 degree, again by the frequency signal outside frequency range shared by power combing module filtering designated communication channel, thus the electromagnetic noise in filter out-band, it is to increase the ability of equipment receiving system electromagnetism interference.
Description
Technical field
The present invention relates to electromagnetism signal technical field of filtering, particularly relate to a kind of phase-shift filtering method.
Background technology
Current communication system, the filtering scope of radio frequency noise is only only limitted to the filtering to the radio noise in communications band passband. Fig. 1 is transmitting and the reception programme structure example of a kind of communication system of the prior art. Wherein, in the receiving loop of this system, first wave filter is a bandpass filter, its can the signal of filtering be the frequency range outside the reception frequency range that takies of whole system i.e. electromagnetism signal with outer frequency range, the band limits of filtering is the frequency range of a suitable wideband, under when comprising multiple communication channel in being with, adjacent frequency interference can be produced between communication channel, and the electromagnetic interference noise in this communications band needs the wave filter ability filtering of arrowband, pole, current prior art there is no the scheme that can carry out filtering. The problem thus caused is, once disturb near the frequency occupied by other communication channels in frequency range, then the demodulation of the radiofrequency signal of current communication channel may be subject to serious impact. This interference is generally called adjacent frequency interference. The source of interference may be mobile terminal, base station, signal generator etc.
Summary of the invention
In view of this, the main purpose of the present invention is to provide a kind of phase-shift filtering method, for solving the problem of the frequency interferences communication channel communication that communication channel is closed on, it is achieved communication channel is to the high noise immunity of the frequency interferences closed on.
For achieving the above object, the technical scheme of the present invention is achieved in that
Based on the embodiment of the present invention, the present invention provides a kind of phase-shift filtering method, and the method for suppressing the electromagnetic interference of designated frequency band in communication system reception/transmission circuit, and the method comprises:
Being regulated by the phase differential of two-way input signal by phase adjustment block so that the phase differential of the two paths of signals of output in the frequency range specified is 0 degree, the phase differential outside designated frequency band is 180 degree; Or the phase differential in the frequency range specified is 180 degree, the phase differential outside designated frequency band is 0 degree.
Based on the embodiment of the present invention, the present invention provides another kind of phase-shift filtering method, and the method for suppressing the electromagnetic interference of designated frequency band in communication system reception/transmission circuit, and the method comprises:
Receive/send out module by both-end message number and receive/launch both-end message number;
The phase differential of the both-end message number by phase adjustment block, described both-end message number being received/being sent out module reception/transmitting regulates, making described phase adjustment block and described both-end message number receive/send out the phase differential of the simple two-way signal between module in designated frequency band is 0 degree, and the phase differential outside designated frequency band is 180 degree; Or the phase differential in designated frequency band is 180 degree, the phase differential outside designated frequency band is 0 degree.
Further, described method also comprises:
In receiving path, by power combing solution module, the two paths of signals that described phase adjustment block exports is converted into single port signal, the signal outside filtering designated frequency band;
In transmitting path, by power decomposing module, single port signal is converted into simple two-way signal, it is input to described phase adjustment block.
Based on the embodiment of the present invention, the present invention provides another kind of phase-shift filtering method, and the method for suppressing the electromagnetic interference of designated frequency band in communication system reception/transmission circuit, and the method comprises:
The two paths of signals dividing success ratio equal one-channel signal by power decomposing module;
By phase adjustment block, the two paths of signals that described power decomposing module exports being carried out phase adjusted, the phase differential of the two paths of signals exported after making adjustment in designated frequency band is 0 degree, and the phase differential outside designated frequency band is 180 degree; Or the phase differential in designated frequency band is 180 degree, the phase differential outside designated frequency band is 0 degree.
Based on the embodiment of the present invention, the present invention provides another kind of phase-shift filtering method, and the method for suppressing the electromagnetic interference of designated frequency band in communication system reception/transmission circuit, and the method comprises:
The phase place of two paths of signals of input being regulated by phase adjustment block, make the phase differential of the two paths of signals of output in designated frequency band be 0 degree, the phase differential outside designated frequency band is 180 degree; Or the phase differential in designated frequency band is 180 degree, the phase differential outside designated frequency band is 0 degree;
By power combing module, the two paths of signals that described phase adjustment block exports is converted into single port signal, the signal outside filtering designated frequency band.
Based on the embodiment of the present invention, the present invention provides another kind of phase-shift filtering method, and the method for suppressing the electromagnetic interference of designated frequency band in communication system reception/transmission circuit, and the method comprises:
The two paths of signals dividing success ratio equal one-channel signal by power decomposing module;
By phase adjustment block, the two paths of signals that described power decomposing module exports being carried out phase adjusted, the phase differential of the two paths of signals exported after making adjustment in designated frequency band is 0 degree, and the phase differential outside designated frequency band is 180 degree; Or the phase differential in designated frequency band is 180 degree, the phase differential outside designated frequency band is 0 degree;
By power combing module, the two paths of signals that described phase adjustment block exports is converted into single port signal, the signal outside filtering designated frequency band.
Further, in above-mentioned phase-shift filtering method, described power decomposing module adopts power splitter or Ba Lun to realize.
Further, in above-mentioned phase-shift filtering method, described power combing module adopts power combing device, Ba Lun or differential low-noise amplifier to realize, wherein:
Phase differential in designated frequency band is 0 degree, when the phase differential outside designated frequency band is 180 degree, selects the signal outside power combing device filtering designated frequency band, retains the signal in designated frequency band;Or
Phase differential in designated frequency band is 0 degree, when the phase differential outside designated frequency band is 180 degree, selects Ba Lun or differential low-noise amplifier to retain the signal outside designated frequency band, the signal in filtering designated frequency band; Or
Phase differential in designated frequency band is 180 degree, when the phase differential outside designated frequency band is 0 degree, selects power combing device to retain the signal outside designated frequency band, the signal in filtering designated frequency band; Or
Phase differential in designated frequency band is 180 degree, when the phase differential outside designated frequency band is 0 degree, selects the signal outside Ba Lun or differential low-noise amplifier filtering designated frequency band, retains the signal in designated frequency band.
Further, the described phase-adjusted method of described phase adjustment block execution is:
By signal sampling module, first via input signal is sampled, sampled signal is exported to phase control module;
By phase control module control figure phase filter, regulated the phase place of designated frequency band signal by the rank number of control figure phase filter, to the signal phase compensation 180 degree of described designated frequency band;
2nd road input signal is directly exported as output signal from output port.
Further, the described phase-adjusted method of described phase adjustment block execution is:
By variable capacity/inductance control circuit, the capacitance/inductance values of variable condenser/inductance is regulated;
By the center frequency point of the filtering of variable condenser/adjustment of inductance inverse filter;
Under the control of described variable condenser/inductance, inverse filter is to the signal phase compensation 180 degree of designated frequency band;
2nd road input signal of described phase-shifting filter device directly exports from output port as output signal.
Based on the embodiment of the present invention, the present invention provides the method that another kind can suppress adjacent frequency and disturb, and the method comprises:
Electromagnetism signal outside using the first wave filter filtering communication system to receive frequency band;
The signal using phase-shifting filter device to be exported by the first wave filter carries out phase-shift filtering, the electromagnetism signal outside filtering designated frequency band;
The single-ended signal that phase-shifting filter device exports is carried out demodulation process.
The present invention is in receiving system, use phase adjustment block to input the phase differential of the signal in port in designated frequency band and outside designated frequency band to two to regulate, making phase differential in the frequency range specified of signal that two output ports export be 0 degree, the phase differential outside designated frequency band is 180 degree; Or, the phase differential of the phase differential of the two paths of signals that phase adjustment block exports in the frequency range specified is 180 degree, phase differential outside designated frequency band is 0 degree, again by frequency range shared by power combing module filtering designated communication channel or the electromagnetism signal outside shared frequency range, thus the electromagnetic noise in filter out-band, the ability of raising equipment receiving system electromagnetism interference, the electromagnetic noise of the channel that communication channel is contiguous will be suppressed greatly. The robustness of communication system under complex electromagnetic environment will be strengthened greatly.
Accompanying drawing explanation
Fig. 1 is the block diagram of the communication system of prior art;
The structural representation of a kind of phase-shifting filter device that Fig. 2 provides for the embodiment of the present invention;
The structural representation of a kind of phase-shifting filter device that Fig. 3 provides for the embodiment of the present invention;
The structural representation of a kind of phase-shifting filter device that Fig. 4 provides based on Fig. 3 for the present invention;
A kind of communication system block diagram that Fig. 5 provides based on Fig. 4 for the present invention, includes the balancing aerial shown in Fig. 4 and phase adjustment block;
The structural representation of another kind of phase-shifting filter device that Fig. 6 provides based on Fig. 3 for the present invention;
Fig. 7 is the schematic diagram of the present invention based on the both-end port communications system of Fig. 6;
The structural representation of a kind of phase-shifting filter device that Fig. 8 provides for the embodiment of the present invention;
The structural representation of a kind of phase-shifting filter device that Fig. 9 provides for the embodiment of the present invention
The structural representation of a kind of phase-shifting filter device that Figure 10 provides for the embodiment of the present invention;
The block diagram of the communication system that Figure 11 provides for the embodiment of the present invention, adds phase-shifting filter device;
The phase-shifting filter device (group) realized by digital filtering method that Figure 12 provides for the embodiment of the present invention realize block diagram;
Figure 13 for the embodiment of the present invention provide by inverse filter add variable capacity (inductance) method realize phase-shifting filter device (group) realize block diagram;
The frequency response of the phase-shifting filter device that Figure 14 provides for the embodiment of the present invention;
The optimal result of the amplitude response of the signal of single difference output in the phase-shifting filter device that Figure 15 provides for the embodiment of the present invention;
The difference signal exported in the phase-shifting filter device that Figure 16 provides for the embodiment of the present invention is directly converted to the result after single-ended signal.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, by the following examples also with reference to accompanying drawing, the present invention is described in more detail.
Embodiment 1
The structural representation of a kind of phase-shifting filter device that Fig. 2 provides for the embodiment of the present invention, this application of installation is in communication system reception/transmission circuit, and for suppressing the adjacent frequency to designated frequency band to disturb, this device comprises: phase adjustment block;
Described phase adjustment block is for regulating the two paths of signals phase differential from input port input so that the phase differential of the two paths of signals that this module exports in the frequency range specified is 0 degree, and the phase differential outside designated frequency band is 180 degree; Or the phase differential in the frequency range specified is 180 degree, the phase differential outside designated frequency band is 0 degree.
Described phase adjustment block has dual input port and dual output port, and two groups of both-end mouths are respectively used to the connection with other assembly, it is achieved phase-adjusted effect.
The signal of the output of described phase-shifting filter device just can realize corresponding filter effect through a power combing module.
Preferably, described phase-shifting filter device can comprise one group of phase adjustment block, carry out selected signal by which phase adjustment block by adding radio frequency switch. Mode of connection is: one end of all phase adjustment block all links together, and the other end selects the flow direction of signal by a radio frequency switch.
Embodiment 2
The structural representation of another kind of phase-shifting filter device that Fig. 3 provides for the embodiment of the present invention, this device comprises: comprises both-end message number and receives/send out module and phase adjustment block, wherein:
Module is received/sent out to both-end message number, for receiving/launch both-end message number;
Phase adjustment block, for regulating both-end message number to receive/send out the phase differential of signal of two output ports of module, makes the two paths of signals exported after regulating equal in the frequency range specified or close to 180 degree, equals or close to 0 degree outside described designated frequency band; Or the phase differential of signal of two output ports regulating both-end message number to receive/send out module equals in the frequency range specified or close to 0 degree, equal outside described designated frequency band or close to 180 degree.
A both-end mouth of module was received/sent out to described both-end message number both-end mouth and phase adjustment block connects;Another group both-end mouth of described phase adjustment block is as the external connectivity port of phase-shifting filter device;
Fig. 4 is this embodiment preferred embodiment, in this example, module is received/sent out to described both-end message number is balancing aerial, the difference signal that balancing aerial exports is input in phase adjustment block, phase adjustment block regulates the phase place of signal of input so that anti-phase (phase differential for equal or close to 180 degree) of the phase differential of the signal that two output ports of phase adjustment block export in designated frequency band and outside designated frequency band.
A kind of communication system block diagram that Fig. 5 provides for Fig. 4, includes the balancing aerial shown in Fig. 4 and phase adjustment block. This system is a receipts/system.
Receiving path is: after balancing aerial receives the signal of freeboard, the adjustment of phase place is carried out by phase adjustment block, the filter effect of phase-shift filtering module is realized by power combing module, afterwards, signal enters the first wave filter and carries out filtering, then enters, by radio frequency switch, the reception that receiving demodulation module completes signal.
Transmitting path is: after launching modulation module generates signals, by radio frequency switch, enter the first wave filter and carry out filtering, for transmitting, power combing module at receiving loop has just become the power decomposing module launching module, next signal enters phase adjustment block and realizes filter effect, this filter effect combines realization by balancing aerial, and (implementation of the filter effect that realization combined by phase adjustment block and balancing aerial is: phase adjustment block needs the electromagnetism signal of the designated frequency band of filtering owing to being changed phase place information by phase adjustment block, therefore just cannot be launched by balancing aerial).
Described communication system is exactly the system including described receiving path and transmitting path.
Fig. 6 is another preferred embodiment of this embodiment, in this example, module is received/sent out to described both-end message number is that chip is received/sent out to a both-end message number, and the signal demand that phase adjustment block exports ensures that the phase place in designated frequency band and the phase differential outside designated frequency band are 180 degree.
The signal of the output of described phase-shifting filter device just can realize corresponding filter effect through a power combing module.
Fig. 7 is the schematic diagram of the present invention based on the both-end port communications system of Fig. 6. Wherein, both-end mouth signal emission module produces both-end message number, after phase adjustment block phase shift, is received by both-end mouth signal receiving module, and both-end message number is by, after phase adjustment block, just achieving filter effect. The embodiment of this both-end port communications system is generally applied in the occasion of the long haul communication of both-end message number.
Embodiment 3
The structural representation of a kind of phase-shifting filter device that Fig. 8 provides for the embodiment of the present invention, this device comprises: power decomposing module and phase adjustment block, wherein:
Power decomposing module, the two paths of signals that the one-channel signal point success ratio for receiving is equal, the phase place of two paths of signals is not required by the present invention. With the device of rate of doing work decomposing module can be power splitter, Ba Lun (Balun, balance-uneven umformer) or other can by the device of power decile.
Phase adjustment block, for receiving the two paths of signals that described power decomposing module exports, and regulates the phase differential of two paths of signals to equal in the frequency range specified or close to 180 degree, equals or close to 0 degree outside described designated frequency band; Or the phase differential regulating two paths of signals equals or close to 0 degree in the frequency range specified, equal outside described designated frequency band or close to 180 degree.Namely the phase differential of the phase differential of the signal exported from described phase adjustment block two ports in designated frequency band and outside designated frequency band is made to be anti-phase;
An external connectivity port of the phase-shifting filter device of this embodiment is the single port place of power decomposing module, two port of power decomposing module connects a both-end mouth of phase adjustment block, and another group both-end mouth of phase adjustment block is as the external connectivity port of phase-shifting filter device.
The application scenario of the phase-shifting filter device in this embodiment is described signal is single-ended signal, now, need to carry out phase shift by phase-shift filtering module and realize filter effect, just need first to use power decomposing module that single-ended signal is converted into both-end message number, again this both-end message number is inputted phase adjustment block and carry out phase adjusted, and when this signal is undertaken receiving by the mouth signal receiving chip of both-end shown in Fig. 7, it is suitable for the phase-shifting filter device of the present embodiment.
Embodiment 4
A kind of phase-shifting filter device that Fig. 9 provides for the embodiment of the present invention comprises: phase adjustment block and power combing module, wherein:
Phase adjustment block, for receiving outside differential input signal, the phase differential of two-way input signal is regulated so that the phase differential of two paths of signals that this module exports equals or close to 180 degree in the frequency range specified, equal outside described designated frequency band or close to 0 degree; Or the phase differential regulating two-way input signal equals or close to 0 degree in the frequency range specified, equal outside described designated frequency band or close to 180 degree. Namely make the phase differential of the signal from two the ports outputs of described phase adjustment block in designated frequency band and outside designated frequency band anti-phase (phase differential is 180 degree);
Power combing module, the two paths of signals exported from phase adjustment block for receiving, the both-end message number transmitted between phase adjustment block and power combing module is converted into single port signal, and when power combing module uses the mode of two paths of signals energy addition, then can filtering designated frequency band, leave the signal of the frequency range outside designated frequency band; When power combing module uses the mode of two paths of signals energy subtraction, then can leave designated frequency band, the frequency band signals outside filtering designated frequency band.
The application scenario of this phase-shifting filter device is: described input signal is both-end message number, now, need to carry out phase shift by phase-shift filtering module and realize filter effect, and when the signal after phase-shift filtering being converted into single-ended signal and completes whole filtering process, it is suitable for the phase-shifting filter device of the present embodiment.
Embodiment 5
A kind of phase-shifting filter device structural representation that Figure 10 provides for the embodiment of the present invention, this device comprises: power decomposing module, phase adjustment block, power combing module, wherein:
The input port of this device is the single port of power decomposing module, two port of power decomposing module connects a both-end mouth of phase adjustment block, another group both-end mouth of phase adjustment block connects the both-end mouth of described signal synthesizing module, and the single port of power combing module is external connectivity port.
Power decomposing module, for power is divided into equal two part, is transmitted by two-way, phase place is not required. Can with the device of rate of doing work decomposing module can be power splitter, Ba Lun or other can by the device of power decile.
Phase adjustment block, the phase differential for the signal of two output ports of regulating power decomposing module equals or close to 180 degree in the frequency range specified, and equals or close to 0 degree outside described designated frequency band;Or equal in the frequency range specified or close to 0 degree, equal outside described designated frequency band or close to 180 degree. Namely the phase differential of the signal exported from described phase adjustment block two ports anti-phase in designated frequency band and outside designated frequency band (phase differential equal or close to 180 degree) is made.
Power combing module, for the both-end message number transmitted between phase adjustment block and power combing module is converted into single port signal, makes the energy subtraction needing the frequency range of filtering, it is necessary to the energy of the frequency range of reservation is added, thus realizes filter effect.
When the phase differential of the two paths of signals of phase adjustment block output equals 180 degree in the frequency range specified, when equaling 0 degree outside designated frequency band, if power combing module use two paths of signals energy be added mode, then can filtering designated frequency band, leave the signal of all the other frequency ranges. There is device such as power combing device (being in fact exactly that power splitter uses conversely) of this type of function.
When the phase differential of the two paths of signals of phase adjustment block output equals 180 degree in the frequency range specified, when equaling 0 degree outside designated frequency band, if power combing module uses the mode of two paths of signals energy subtraction, then can leave designated frequency band, the signal of all the other frequency ranges of filtering. There is device such as difference signal syntheses device (being in fact exactly that Ba Lun uses conversely) of this type of function.
Embodiment 6
Adjacent channel can there is the system architecture figure of electromagnetic interference noise in filtering communications band band in what a kind of phase-shifting filter device provided based on Figure 10 that Figure 11 provides for the embodiment of the present invention realized, and this system comprises:
Antenna, for launching or receive air electromagnetic signals;
Antenna switch or duplexer, for distinguishing the state residing for communication system, be used for gated transmission loop and receiving loop;
First wave filter, for receiving the tick transmitted by antenna, and filtering communication system receives the undesired signal outside frequency band from the signal received. The whole reception frequency range that the frequency band (referred to as passband) of this first wave filter institute gating is communication system, comprises one or more communication channel (or can also be referred to as channel) in this frequency band range;
Phase-shifting filter device, for carrying out phase-shift filtering, the frequency range outside filtering designated frequency band to the signal that the first wave filter exports.
Receiving demodulation device, carries out demodulation process for the single-ended signal exported by phase-shifting filter device.
In this system example, the structure of the phase-shifting filter device used as shown in Figure 7, comprising power decomposing module, phase adjustment block, power combing module, wherein:
The single-ended signal that first wave filter exports is input to power decomposing module, being decomposed into difference phase differential by power decomposing module is anti-phase two-way constant amplitude signal, if described power decomposing module adopts power splitter to realize, difference phase differential after then decomposing is 0 degree, if described power decomposing module adopts Ba Lun to realize, then the difference phase differential after decomposing is 180 degree;
When described power decomposing module adopts power splitter to realize, power combing module adopts the mode of signal subtraction, namely selects the signal outside Ba Lun or differential low-noise amplifier filtering designated frequency band. Namely the phase differential that power decomposing module exports is the signal of 0 degree, it is 180 degree by phase adjustment block (group) by the adjusting offset between the frequency range outside the frequency range of current communication channel and current communication channel frequency range, then, after two paths of signals is added by power combing module, the target signal filter in the frequency range outside current communication channel frequency range is fallen.
When described power decomposing module adopts Ba Lun or differential low-noise amplifier realizes, power combing module adopts the mode of signal addition, namely selects the signal outside power combing device (input and output of power splitter use conversely) filtering designated frequency band. The phase differential that power decomposing module exports be the signal of 180 degree by phase adjustment block (group), be 0 degree by the difference phase difference variable of current communication channel; Then, after two paths of signals is subtracted each other by power combing module, the target signal filter in the frequency range outside current communication channel frequency range is fallen.
Embodiment 7
A kind of phase-shifting filter device that Figure 12 provides for the embodiment of the present invention realize structure iron, in this embodiment, power decomposing module uses power splitter, power combing module uses differential low-noise amplifier (DifferentialLowNoiseAmplifier, DLNA). The reason of this embodiment selection power splitter instead of Ba Lun is: selecting Ba Lun, then require that the difference phase place of the signal outside channel needs to be converted into 0 degree, this wider range, more difficult control, what therefore select in present case is power splitter. Select power splitter then only to need the difference phase place of this channel is turned into 180 degree, it is necessary to the frequency range of process is narrower, it is easier to realize.
In this embodiment, the road signal that power decomposing module exports only is processed by phase adjustment block, and another road signal directly exports, and this module specifically comprises: signal sampling module, digital phase filter device, phase control module;
Signal sampling module is used for the road output signal to power decomposing module and samples, and its one end is connected with power decomposing module, and the other end is connected with phase control module; The sampled result obtaining signal is the prerequisite carrying out digital filtering.
Digital phase filter device is used for the signal phase compensation 180 degree of designated frequency band under the control of phase control circuit, and the connection of its one end and power decomposing module, one end and power combing model calling, the other end is connected with phase control module.
The present invention selects the phase place to digital filter to control, instead of amplitude is controlled, the reason namely directly carrying out filtering is: directly carry out filtering, then need digital filter design to become a lot of rank, cause the instability of phase place information, also can produce the very big time delay of signal processing in addition. Therefore, the way that the present invention takes be by power splitter export a road channel frequency in phase compensation 180 degree, minimum digital filter rank number can be used so just can to complete filtering, reduction digital filter complexity.
Phase control module is used for the rank number of control figure phase filter to regulate the phase place of designated frequency band signal, its one end and signal sampling model calling, and the other end is connected with digital phase filter device; By digital phase filter device, phase change information is loaded on a road signal path of power splitter output. Digital phase filter device can be selected, and such as 1 to 2 rank Bart irrigates this wave filter, adds that linear-phase filter carries out the fine setting of time delay. Other digital filter way of realization is also possible, as long as to carry out 180 degree anti-phase for the phase place of the signal of channel.
Embodiment 8
Another kind of phase-shifting filter device that Figure 13 provides for the embodiment of the present invention realize structure iron, this embodiment is different from embodiment 7 is that the implementation of phase adjustment block is different. This embodiment adds the phase adjusting device (group) of variable capacity/inductance method realization by inverse filter.Compare with the implementation of the digital filtering method of phase-shifting filter device, digital filter is easy to realize wave filter (group), and wider range of frequency can be covered, and directly use the bank of filters being made up of hardware will face the little problem of bandwidth coverage, therefore, the present invention proposes to use variable capacity/inductance to regulate inverse filter work frequency range, makes it just and currently to receive channel and overlaps. In this embodiment phase adjustment block realize principle and phase adjustment block in embodiment 7 to realize principle identical, in this embodiment, phase adjustment block comprises:
Variable capacity/inductance control circuit is used for the capacitance to variable condenser and regulates, and its one end is connected with power decomposing module, and the other end is connected with variable condenser/inductance;
Variable condenser/inductance is for regulating the center frequency point of the filtering of inverse filter;
Inverse filter is used for the signal phase compensation 180 degree of designated frequency band under the control of variable condenser/inductance, and the connection of its one end and power decomposing module, one end and power combing model calling, one end is connected with variable condenser/inductance. 1 to 2 rank Bart can be selected to irrigate this wave filter, add that linear-phase filter carries out the fine setting of time delay, obtain the difference phase differential that final wave filter changes signal.
Embodiment 9
Phase-shift filtering module that what Figure 14 described is export through the optimal situation of difference phase place of both-end mouth difference signal of phase shift, wherein, f1And f2Being the most high frequency of current communication channel and minimum frequency, this channel is only the part that whole communication system receives part bandwidth. At f1And f2Between frequency band, the phase differential of differential channel keeps original by Ba Lun 180 degree, and the signal of all the other frequencies, be set to 0 degree (if use power splitter, then at f1And f2Between frequency band, the phase differential of differential channel is set to 180 degree, and the signal of all the other frequencies, is set to keep original by the 0 of power splitter degree). Can accept scope is f1And f2Between the absolute value of difference phase differential from 90 degree to 180 degree (angle scope needs to be limited in 0-180 degree, and negative angle adds that 180 degree just can be converted into positive-angle), f1And f2Outside the scope that can accept of the absolute value of difference phase differential of frequency range be 0 degree to 90 degree (angle scope needs to be limited between 0-180 degree, and negative angle adds that 180 degree just can be converted into positive-angle).
The optimal situation of the energy decrement of the difference signal shown in Figure 15, because being differential lines, energy is divided equally on both wires, and therefore, the decay on two lines, for former single-ended signal, is all-3dB.
Shown in Figure 16 be the characteristic with Figure 14 and Figure 15 difference signal synthesis after the optimal situation of result.
Composite formula is:
When 2 ports and 3 port signal phase bit Inverting, power combing formula is:
Wherein, the poor mould S that the present invention requires123Phase place information as shown in figure 14, amplitude information as shown in figure 16, S12Carry amplitude and the phase place information of a wherein road differential lines, S13Carry amplitude and the phase place information of another road differential lines.
When 2 ports are identical with 3 port signal phase places, power combing formula is:
Wherein, due to common mode signal S12And S13Amplitude is very close and difference phase place is 0 degree, common mode S can be found out by the formula of common mode signal123Will greatly decay.
It can be seen that f1And f2, being also exactly the signal of the interior frequency of current communication channel because being difference mould signal, can find out according to the formula of difference mould signal and not having decay, and f1Below and f2Above signal is common mode signal, according to the formula of common mode signal, decays to negative infinitely great.Consider practical situation, f after synthesis1And f2Between have certain decay, such as, about-0.5dB, this is on the actual reception of signal impact little (scope that can accept is from 0dB to-10dB). And f1Below and f2The decay of above signal also can not be really negative infinitely great, but it also can be a bigger value that rate subtracts value, such as, about-20dB, and this has been to play useful effect (scope that can accept is dB from-5dB to-��) completely in the application of reality.
In addition, the realization of phase adjusting device (group) can be use lump device, resonator filter, digital filter or take to differential lines wherein one carry out time delay (but being not limited to the above method) and realize phase adjusting device (group), realization principle is shown in the amplitude information conforms Figure 15 of the single differential lines that final phase adjusting device (group) realizes, shown in difference phase place information conforms Figure 14, shown in amplitude information conforms Figure 16 of the single-ended signal after synthesis.
The scope of the present invention's application comprises the communication system of all non-single channels with certain communications band. Include but not limited to DTV system, simulated television system, FM loudspeaker system, gsm communication system, cdma communication system, WCDMA communication system, TD-SCDMA communication system, TD-LTE communication system, FDD-LTE communication system etc.
The present invention relates to the problem carrying out the filtering of in-band signalling by changing signal phase place information; breach in prior art the effect that cannot realize; its case study on implementation is not limited to part involved in the present invention, with the similar implementation of above-mentioned design all in protection scope of the present invention.
Claims (9)
1. a phase-shift filtering method, the method for suppressing the electromagnetic interference of designated frequency band in communication system reception/transmission circuit, it is characterised in that, the method comprises:
The phase differential of the two-way input signal being inputted port input by phase adjustment block to self two is regulated, make the signal exported from two output ports of described phase adjustment block in designated frequency band and designated frequency band phase differential be 180 degree, it is specially: the phase differential making the two paths of signals exported in the frequency range specified is 0 degree, and the phase differential outside designated frequency band is 180 degree; Or the phase differential in the frequency range specified is 180 degree, the phase differential outside designated frequency band is 0 degree;
By power combing module, the two paths of signals that described phase adjustment block exports is converted into single port signal, the signal outside filtering designated frequency band.
2. a phase-shift filtering method, the method for suppressing the electromagnetic interference of designated frequency band in communication system reception/transmission circuit, it is characterised in that, the method comprises:
Receive/send out module by both-end message number and receive/launch both-end message number;
By phase adjustment block, the phase differential of the both-end message number that module reception/transmitting was received/sent out to the described both-end message number of self two input port inputs is regulated, make the signal exported from two output ports of described phase adjustment block in designated frequency band and designated frequency band phase differential be 180 degree, it is specially: the phase differential making the simple two-way signal between described phase adjustment block and a described both-end message number receipts/module in designated frequency band is 0 degree, and the phase differential outside designated frequency band is 180 degree; Or the phase differential in designated frequency band is 180 degree, the phase differential outside designated frequency band is 0 degree;
By power combing module, the two paths of signals that described phase adjustment block exports is converted into single port signal, the signal outside filtering designated frequency band.
3. phase-shift filtering method according to claim 2, it is characterised in that, described method also comprises:
In transmitting path, by power decomposing module, single port signal is converted into simple two-way signal, it is input to described phase adjustment block.
4. a phase-shift filtering method, the method for suppressing the electromagnetic interference of designated frequency band in communication system reception/transmission circuit, it is characterised in that, the method comprises:
The two paths of signals dividing success ratio equal one-channel signal by power decomposing module;
The two paths of signals of the described power decomposing module output being inputted port input by phase adjustment block to self two carries out phase adjusted, make the signal exported from two output ports of described phase adjustment block in designated frequency band and designated frequency band phase differential be 180 degree, it is specially: the phase differential of the two paths of signals exported after making adjustment in designated frequency band is 0 degree, and the phase differential outside designated frequency band is 180 degree; Or the phase differential in designated frequency band is 180 degree, the phase differential outside designated frequency band is 0 degree;
By power combing module, the two paths of signals that described phase adjustment block exports is converted into single port signal, the signal outside filtering designated frequency band.
5. phase-shift filtering method according to claim 4, it is characterised in that, described power decomposing module adopts power splitter or Ba Lun to realize.
6. phase-shift filtering method according to claim 4, it is characterised in that, described power combing module adopts power combing device, Ba Lun or differential low-noise amplifier to realize, wherein:
Phase differential in designated frequency band is 0 degree, when the phase differential outside designated frequency band is 180 degree, selects the signal outside power combing device filtering designated frequency band, retains the signal in designated frequency band; Or
Phase differential in designated frequency band is 0 degree, when the phase differential outside designated frequency band is 180 degree, selects Ba Lun or differential low-noise amplifier to retain the signal outside designated frequency band, the signal in filtering designated frequency band; Or
Phase differential in designated frequency band is 180 degree, when the phase differential outside designated frequency band is 0 degree, selects power combing device to retain the signal outside designated frequency band, the signal in filtering designated frequency band; Or
Phase differential in designated frequency band is 180 degree, when the phase differential outside designated frequency band is 0 degree, selects the signal outside Ba Lun or differential low-noise amplifier filtering designated frequency band, retains the signal in designated frequency band.
7. phase-shift filtering method according to the arbitrary item of Claims 1-4, it is characterised in that, described phase adjustment block performs described phase-adjusted method and is:
By signal sampling module, first via input signal is sampled, sampled signal is exported to phase control module;
By phase control module control figure phase filter, regulated the phase place of designated frequency band signal by the rank number of control figure phase filter, to the signal phase compensation 180 degree of described designated frequency band;
2nd road input signal is directly exported as output signal from output port.
8. phase-shift filtering method according to the arbitrary item of Claims 1-4, it is characterised in that, described phase adjustment block performs described phase-adjusted method and is:
By variable capacity/inductance control circuit, the capacitance/inductance values of variable condenser/inductance is regulated;
By the center frequency point of the filtering of variable condenser/adjustment of inductance inverse filter;
Under the control of described variable condenser/inductance, inverse filter is to the signal phase compensation 180 degree of designated frequency band;
2nd road input signal of described phase-shifting filter device directly exports from output port as output signal.
9. one kind can be suppressed the method that adjacent frequency disturbs, it is characterised in that, the method comprises:
Electromagnetism signal outside using the first wave filter filtering communication system to receive frequency band;
The signal using phase-shifting filter device to be exported by the first wave filter carries out phase-shift filtering,
Comprise: by power decomposing module by two paths of signals equal for one-channel signal point success ratio;
The two paths of signals of the described power decomposing module output being inputted port input by phase adjustment block to self two carries out phase adjusted, make the signal exported from two output ports of described phase adjustment block in designated frequency band and designated frequency band phase differential be 180 degree, it is specially: the phase differential of the two paths of signals exported after making adjustment in designated frequency band is 0 degree, and the phase differential outside designated frequency band is 180 degree; Or the phase differential in designated frequency band is 180 degree, the phase differential outside designated frequency band is 0 degree;
By power combing module, the two paths of signals that described phase adjustment block exports is converted into single port signal, the electromagnetism signal outside filtering designated frequency band;
The single-ended signal that phase-shifting filter device exports is carried out demodulation process.
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| CN201210039511.5A CN102611469B (en) | 2012-02-21 | 2012-02-21 | A kind of phase-shift filtering method |
| PCT/CN2012/074131 WO2013123706A1 (en) | 2012-02-21 | 2012-04-16 | Phase-shift filter method |
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| CN201210039511.5A CN102611469B (en) | 2012-02-21 | 2012-02-21 | A kind of phase-shift filtering method |
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| JP6095444B2 (en) * | 2013-03-29 | 2017-03-15 | 富士通テン株式会社 | Antenna device and radar device |
| CN103595366B (en) * | 2013-10-17 | 2016-05-11 | 天津大学 | A kind of 0.6～1.2GHz CMOS second order dot matrix Ba Lun |
| CN104122273B (en) * | 2014-07-11 | 2017-08-25 | 电子科技大学 | The radiometer synthesized based on multichannel frequency band |
| CN106911197A (en) * | 2017-05-02 | 2017-06-30 | 佛山职业技术学院 | A kind of simple environment electromagnetics signal acceptance method |
| CN108400774B (en) * | 2018-03-22 | 2020-06-02 | 上海唯捷创芯电子技术有限公司 | Balanced radio frequency power amplifier, chip and communication terminal |
| CN111064482B (en) * | 2018-10-16 | 2021-08-10 | 青岛海信移动通信技术股份有限公司 | Equipment and method for suppressing interference |
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| CN102318188A (en) * | 2007-08-23 | 2012-01-11 | 太阳诱电株式会社 | Filter, demultiplexer, and module including demultiplexer, communication apparatus |
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| US4578652A (en) * | 1984-05-14 | 1986-03-25 | Itt Corporation | Broadband four-port TEM mode 180° printed circuit microwave hybrid |
| JP2712923B2 (en) * | 1991-09-10 | 1998-02-16 | 富士通株式会社 | SAT phase shift circuit |
| US6137353A (en) * | 1998-06-29 | 2000-10-24 | Philips Electronics North America Corporation | Linearized integrated FM demodulator using a plurality of cascaded all-pass filters or a bessel filter |
| FR2869483B1 (en) * | 2004-04-21 | 2007-01-05 | Sagem | SPREAD SPECTRUM SIGNAL BROKER REJECTOR METHOD AND DEVICE |
| KR100617139B1 (en) * | 2004-12-07 | 2006-08-31 | 엘지전자 주식회사 | A frequency direct conversion receiver for a mobile telecommunication device and a direct conversion method using the device |
| KR100744913B1 (en) * | 2006-05-16 | 2007-08-01 | 삼성전기주식회사 | Mobile terminal and mothed for removing interfering phase-noise in the mobile terminal |
| US7656964B1 (en) * | 2007-01-24 | 2010-02-02 | Rf Micro Devices, Inc. | Forward and reverse VSWR insensitive power detection using phase shifting and harmonic filtering |
| CN101651646B (en) * | 2009-09-02 | 2013-07-03 | 中兴通讯股份有限公司 | Differential receiving system of cellular receiver and method for realizing signal reception |
| CN102148633A (en) * | 2010-02-05 | 2011-08-10 | 松下电器产业株式会社 | Wireless receiving device and method for reducing received noise by utilizing diversity antenna |
| CN102594379A (en) * | 2012-02-21 | 2012-07-18 | 中兴通讯股份有限公司 | Phase-shifting filter device and application thereof |
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| CN102318188A (en) * | 2007-08-23 | 2012-01-11 | 太阳诱电株式会社 | Filter, demultiplexer, and module including demultiplexer, communication apparatus |
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| WO2013123706A1 (en) | 2013-08-29 |
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