CN104104458A - Method for determining main signals of time division signals and method for detecting strength of main signals - Google Patents
Method for determining main signals of time division signals and method for detecting strength of main signals Download PDFInfo
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- CN104104458A CN104104458A CN201410342737.1A CN201410342737A CN104104458A CN 104104458 A CN104104458 A CN 104104458A CN 201410342737 A CN201410342737 A CN 201410342737A CN 104104458 A CN104104458 A CN 104104458A
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Abstract
The invention provides a method for determining main signals of time division signals. Two paths of signals passing through the coupling end and the output end of a coupler after frequency mixing is conducted are obtained; the path of signals of the coupling end are transformed into second low-frequency envelope voltages through a detector; the path of signals of the output end are transformed into first low-frequency envelop voltages through the detector after intermediate frequency smoothing is conducted; the two paths of low-frequency envelop voltages are compared in real time through a chip with an ADC function, the voltage difference value of the two paths of low-frequency envelop voltages is obtained, and whether the signals are main channel signals or interference signals is judged, wherein the specific judging method comprises the following steps that the range of voltage difference values of the two paths of low-frequency envelop voltages when the time division signals are the main signals is set according to the rejection characteristics of a circuit, the voltage difference values are compared in real time through a comparison unit, signals within the range are the main channel signals, and signals beyond the range are the interference signals.
Description
Technical field
The present invention relates to a kind of ionization meter and the judgement to the frequency at signal place and interference frequency of time division signal.
Background technology
Conventional signal strength measurement technology is substantially all to detect aspect analog circuit, through frequency conversion, then filtering convert low frequency envelope voltage value to by detection chip, but the shortcoming of this kind of scheme is the impact that is subject to interference signal, the particularly interference of neighboring trace signal, such as gsm service signal, when the intensity of neighboring trace signal and the signal strength difference of main channel are greater than 35dB, it is exactly the intensity of interference signal that this kind of method measured what come, but not the signal strength signal intensity of main channel, the information making the mistake to user, conventionally the method for head it off is to solve with the demodulation of numeric field, but this kind of method is too complicated, and cost is higher.The invention is intended to address this problem, under the condition of analog circuit, can accurately distinguish useful signal and interference signal, allow user in use can determining apparatus whether be subject to interference.
Summary of the invention
The object of the invention is to: the main signal decision method and the strength detecting method thereof that propose a kind of time division signal, by the scheme of analog circuit, time division signal intensity is measured, and exclude the interference signal and improve the signal interference problem of existing equipment, the especially interference of adjacent-channel signals.
Technical scheme of the present invention is: a kind of main signal decision method of time division signal, extract mixing by the two paths of signals of overcoupling device coupled end and output, and coupled end Yi road signal changes into the second low frequency envelope voltage by wave detector; Output Yi road signal changes into the first low frequency envelope voltage through wave detector again after intermediate frequency filtering; By thering is the chip of ADC function, two-way low frequency envelope voltage is compared in real time, draw the voltage difference of two-way low frequency envelope voltage, and judgement is main channel signal or interference signal;
Concrete determination methods is as follows: according to the suppression characteristic of circuit, set when time division signal is main signal, the scope of the voltage difference of two-way low frequency envelope voltage, by the real-time comparative voltage difference of comparing unit, signal within the scope of this is main channel signal, and the signal that exceeds this scope is interference signal.
As preferred version, a main signal decision method for time division signal, comprises the first coupler, the first attenuator and the second attenuator, the first low pass filter and the second low pass filter, first detector and second detector, the first intermediate-frequency filter and the second intermediate-frequency filter, the first amplifier and the second amplifier;
The coupling port of the first coupler be linked in sequence the second attenuator, the second low pass filter and second detector; Signal after mixing is through the coupling port of first degree of coupling, and by the second attenuator and the second low pass filter, then after second detector, to be converted to the second low frequency envelope voltage be V2;
The output port of the first coupler be linked in sequence the first attenuator, the first intermediate-frequency filter, the first amplifier, the second intermediate-frequency filter, the second amplifier, the first low pass filter and first detector; Signal after mixing is through the output port of first degree of coupling, order is by the first attenuator, the first intermediate-frequency filter, the first amplifier again, and then through the second intermediate-frequency filter, the second amplifier, the first low pass filter, finally by first detector, converting the first low frequency envelope voltage to is V1;
If two-way magnitude of voltage V1-V2=△ is V, be main signal, retain V1 value now, if V1-V2< △ is V, be interference signal, give up V1 value now; Wherein, △ V is the V1 of time division signal while being main signal and the difference of V2.
Gsm service signal for example, carrier spacing is 200KHz, its business characteristic is that the signal of a carrier wave can drop in contiguous several carrier waves, particularly in 2 adjacent carrier waves, be that strength difference between main channel signal and neighboring trace signal only has 35dB, thisly drop on signal in passband filtering all cannot filtering in any case, such a time division signal, the signal strength signal intensity of coming lower than neighboring trace leakage signal when the signal strength signal intensity of main channel, the signal strength values detecting by this traditional analog circuit detection method is so the intensity level of neighboring trace signal, but not the signal strength values of main channel, the information that can make the mistake to user like this.The present invention extracts respectively mixing by the two paths of signals of overcoupling device coupled end and output, and through wave detector, two paths of signals is changed into respectively to low frequency envelope voltage V1, V2, by thering is the chip of ADC function (including but not limited to single-chip microcomputer), compare, relatively its voltage difference is judged main channel signal and interference signal in real time, if two-way magnitude of voltage V1-V2 is △ V, being channel main signal, if V1-V2< △ is V, is interference channel signal.
The present invention also provides a kind of strength detecting method of time division signal, it is characterized in that: comprise the second coupler, radio-frequency filter, third detector and dual comparator; Wireless receiving signal also exports the second coupler to, the coupled end output signal of the second coupler is after radio-frequency filter and third detector, being converted to the 3rd low frequency envelope voltage is V3, V3 sends into the positive input of dual comparator, the reverse input end of dual comparator is regulated and is obtained an incoming level V4 by bleeder circuit, V3, V4 are relatively obtained to the output voltage V ctrl of dual comparator, when Vctrl is high level, time division signal is weak signal, and input end signal is sent into frequency mixer after amplifier; When Vctrl is low level, time division signal is strong signal, and input end signal is sent into frequency mixer after attenuator.
Further, in intensity detection circuit, also comprise the first switch and second switch, the output of the second coupler connects the first switch, the output of dual comparator connects second switch, by Vctrl, control the first switch and second switch, when Vctrl is high level, time division signal is weak signal simultaneously, Vctrl controls the first switch and second switch is beaten to amplifier, and the output end signal of the second coupler is sent into frequency mixer after amplifier; When Vctrl is low level, time division signal is strong signal, and Vctrl controls the first switch and second switch is beaten to attenuator, and the output end signal of the second coupler is sent into frequency mixer after attenuator.
Further, the value of described incoming level V4 is 0.5 ± 0.1V.
The invention has the beneficial effects as follows: with respect to traditional analog circuit detection method, detection method feature described in the invention is that comparison mixing is by the voltage difference of the two paths of signals of overcoupling device coupled end and output, by real-time comparison 2 road voltage differences, can accurately quote the signal strength values of main channel, if voltage difference is △ V, single-chip microcomputer can think that the V1 value now detecting is effective value, retain this value, if voltage difference < △ is V, single-chip microcomputer, for being interference signal, is given up V1 value now.
The present invention also comprises strong signal determining problem, at the input road signal that is coupled, carry out detection, by comparator, compare control voltage, by the selector switch of this voltage control circuit, for strong signal, signal enters frequency mixer after attenuator, for weak signal, signal enters frequency mixer after amplifier, and this kind of method can increase the dynamic range of equipment.
Accompanying drawing explanation
Fig. 1 is the schematic block diagram of the trunk signal decision method of time division signal;
Fig. 2 is wave detector schematic block diagram;
Fig. 3 is strong signal determining schematic diagram;
Fig. 4 is comparator schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.
As shown in Figure 1, comprise the first coupler, the first attenuator and the second attenuator, the first low pass filter and the second low pass filter, first detector and second detector, the first intermediate-frequency filter and the second intermediate-frequency filter, the first amplifier and the second amplifier.Wherein, the first coupler is selected the EMDC-10-1 of MACOM company, the first attenuator and the second attenuator are selected Pi type impedance network attenuator, the first low pass filter and the second low pass filter are selected HDF902E1, first detector and second detector are selected the AD8310ARM of ADI company, the first intermediate-frequency filter and the second intermediate-frequency filter select 361731, the first amplifiers and the second amplifier to select the SPF5043 of RFMD company.
The degree of coupling of the first coupler is Cp, and insertion loss is Il, and for the signal Pmix (dBm) after mixing, the signal strength signal intensity of the first coupler coupling port is Pmix-Cp, and the signal strength signal intensity of output port is Pmix-I
l.The coupling port of first degree of coupling be linked in sequence the second attenuator, the second low pass filter and second detector, the signal after mixing is through the coupling port of first degree of coupling, then through the second attenuator and the second low pass filter, the portfolio premium of attenuation filter is G
a, then after second detector, be converted to the second low frequency envelope voltage V2.The output port of first degree of coupling be linked in sequence the first attenuator, the first intermediate-frequency filter, the first amplifier, the second intermediate-frequency filter, the second amplifier, the first low pass filter and first detector, signal after mixing is through the output port of first degree of coupling, again through the first attenuator, the first intermediate-frequency filter, the first amplifier, and then through the second intermediate-frequency filter, the second amplifier, the first low pass filter, the portfolio premium of decay, filtering and amplifier is G
b, finally by first detector, convert low frequency envelope voltage V1 to.
The effect of V2 is for judging main signal and interference signal, judged after main signal and interference signal, the field intensity value finally showing is determined by the value of V1, if two-way magnitude of voltage V1-V2=△ is V, be main signal, retain V1 value now, if V1-V2< △ is V, be interference signal, give up V1 value now.
Below describe judgement parameter of the present invention in detail: the output voltage of wave detector depends on the level value of input signal, take logarithmic detector as example, incoming level Pin, in its linear input range, its output voltage:
Vout＝K×Pin (1)
In formula, K is detection output voltage slope
A road signal, the signal voltage of its coupling is
V2＝K×(Pmix-Cp+G
A)， (2)
B road signal, the voltage of its output signal is
V1＝K×(Pmix-I
l+G
B)， (3)
(2), (3) formula are arranged out
△V＝V2-V1＝K×(G
B-I
l+Cp-G
A) (4)
(4) formula has provided the magnitude of voltage of △ V, is the gain difference of two-way circuit,
If main channel signal G
b=P
fL+ G
lNA, if interference signal G
b=P
i+ G
lNA.
P in formula
fLfor the insertion loss of intermediate-frequency filter, G
lNAfor the gain of amplifier, P
ifor the inhibition degree of intermediate-frequency filter to interference signal.In the range of linearity of wave detector, decide primary channel signal and interference signal accurately.
As shown in Figure 2, for given detection device, its linear input range is the dBm of (P_dmin, P_dmax) unit, can pass through G
aand G
brespectively the level of A, B port is adjusted to the linear input range of wave detector.The AD8310ARM of YiADI company is example, its dynamic range has reached 95dB, but in side circuit, the input signal of wave detector not only comprises useful signal, also comprise ground noise, so its dynamic range is subject to the impact of ground noise, ground noise directly affects the minimum incoming level of whole circuit, the namely sensitivity of equipment.
For these reasons, the present embodiment provides a kind of strong signal determinating circuit, by strong signal determining scheme, can improve the dynamic range of equipment.As shown in Figure 3,4, the degree of coupling of the second coupler is Cp, and insertion loss is I
l, for wireless input signal, the signal strength signal intensity of its coupled end is Pmix-Cp.The signal of coupled end is through radio-frequency filter and third detector, wherein radio-frequency filter is selected HDF902E1, third detector is selected AD8314ACPZ-R7, after third detector, be converted to the 3rd low frequency envelope voltage V3, V3 sends into the positive input of dual comparator, the reverse input end of dual comparator is regulated and is obtained an incoming level V4 by bleeder circuit, and V4 value is 0.5V, V3, V4 is relatively obtained to the output voltage V ctrl of dual comparator.
The output of the second coupler connects the first switch, the output of dual comparator connects second switch, and control the first switch and second switch by Vctrl simultaneously, when Vctrl is high level, time division signal is weak signal, Vctrl controls the first switch and second switch is beaten to amplifier, and the output end signal of the second coupler is sent into frequency mixer after amplifier; When Vctrl is low level, time division signal is strong signal, and Vctrl controls the first switch and second switch is beaten to attenuator, and the output end signal of the second coupler is sent into frequency mixer after attenuator.
Input signal is through amplifying (when Vctrl is high level, input end signal is through amplifier) or decay (when Vctrl is low level, input end signal is through attenuator) after send into frequency mixer, extract mixing by the two paths of signals of overcoupling device coupled end and output, coupled end signal is through the second attenuator and the second low pass filter, and the portfolio premium of decay and filtering is G
aafter second detector, be converted to again the second low frequency envelope voltage V2, the signal of output is through the first attenuator, the second intermediate-frequency filter, the second amplifier, and then through the second intermediate-frequency filter, the second amplifier and the first low pass filter, the portfolio premium of decay, filtering and amplifier is G
bfinally by first detector, convert the first low frequency envelope voltage V1 to, the voltage of V1 and V2 is admitted to single-chip microcomputer, relatively its voltage difference is judged main channel signal and interference channel signal in real time, if two-way magnitude of voltage V1-V2 is △ V, being main channel signal, if V1-V2< △ is V, is interference signal.
Although the present invention discloses as above with preferred embodiment, so it is not in order to limit the present invention.Persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is when being as the criterion depending on claims person of defining.
Claims (5)
1. a main signal decision method for time division signal, is characterized in that: extract mixing by the two paths of signals of overcoupling device coupled end and output, coupled end Yi road signal changes into the second low frequency envelope voltage by wave detector; Output Yi road signal changes into the first low frequency envelope voltage through wave detector again after intermediate frequency filtering; By thering is the chip of ADC function, two-way low frequency envelope voltage is compared in real time, draw the voltage difference of two-way low frequency envelope voltage, and judgement is main channel signal or interference signal;
Concrete determination methods is as follows: according to the suppression characteristic of circuit, set when time division signal is main signal, the scope of the voltage difference of two-way low frequency envelope voltage, by the real-time comparative voltage difference of comparing unit, signal within the scope of this is main channel signal, and the signal that exceeds this scope is interference signal.
2. the main signal decision method of a kind of time division signal according to claim 1, is characterized in that: comprise the first coupler, the first attenuator and the second attenuator, the first low pass filter and the second low pass filter, first detector and second detector, the first intermediate-frequency filter and the second intermediate-frequency filter, the first amplifier and the second amplifier;
The coupling port of the first coupler be linked in sequence the second attenuator, the second low pass filter and second detector; Signal after mixing is through the coupling port of first degree of coupling, and by the second attenuator and the second low pass filter, then after second detector, to be converted to the second low frequency envelope voltage be V2;
The output port of the first coupler be linked in sequence the first attenuator, the first intermediate-frequency filter, the first amplifier, the second intermediate-frequency filter, the second amplifier, the first low pass filter and first detector; Signal after mixing is through the output port of first degree of coupling, order is by the first attenuator, the first intermediate-frequency filter, the first amplifier again, and then through the second intermediate-frequency filter, the second amplifier, the first low pass filter, finally by first detector, converting the first low frequency envelope voltage to is V1;
If two-way magnitude of voltage V1-V2=△ is V, be main signal, retain V1 value now, if V1-V2< △ is V, be interference signal, give up V1 value now; Wherein, △ V is the V1 of time division signal while being main signal and the difference of V2.
3. a strength detecting method for time division signal, is characterized in that: comprise the second coupler, radio-frequency filter, third detector and dual comparator; Wireless receiving signal also exports the second coupler to, the coupled end output signal of the second coupler is after radio-frequency filter and third detector, being converted to the 3rd low frequency envelope voltage is V3, V3 sends into the positive input of dual comparator, the reverse input end of dual comparator is regulated and is obtained an incoming level V4 by bleeder circuit, V3, V4 are relatively obtained to the output voltage V ctrl of dual comparator, when Vctrl is high level, time division signal is weak signal, and input end signal is sent into frequency mixer after amplifier; When Vctrl is low level, time division signal is strong signal, and input end signal is sent into frequency mixer after attenuator.
4. the strength detecting method of a kind of time division signal according to claim 3, it is characterized in that: comprise the first switch and second switch, the output of the second coupler connects the first switch, the output of dual comparator connects second switch, by Vctrl, control the first switch and second switch, when Vctrl is high level, time division signal is weak signal simultaneously, Vctrl controls the first switch and second switch is beaten to amplifier, and the output end signal of the second coupler is sent into frequency mixer after amplifier; When Vctrl is low level, time division signal is strong signal, and Vctrl controls the first switch and second switch is beaten to attenuator, and the output end signal of the second coupler is sent into frequency mixer after attenuator.
5. the strength detecting method of a kind of time division signal according to claim 3, is characterized in that: the value of described incoming level V4 is 0.5 ± 0.1V.
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| CN1617456A (en) * | 2003-11-13 | 2005-05-18 | 株式会社瑞萨科技 | High frenquency signal receiver and semiconductor integrated circuit |
| EP2045926A1 (en) * | 2006-06-28 | 2009-04-08 | Panasonic Corporation | Adjacent channel interference detecting apparatus and method |
| CN101800609A (en) * | 2010-02-03 | 2010-08-11 | 华为终端有限公司 | Method and device for displaying disturbance degree of environmental noise |
| CN102404059A (en) * | 2010-08-04 | 2012-04-04 | 宏旸科技股份有限公司 | Automatic gain control system with dual-RSSI interference detection |
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2014
- 2014-07-17 CN CN201410342737.1A patent/CN104104458B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1617456A (en) * | 2003-11-13 | 2005-05-18 | 株式会社瑞萨科技 | High frenquency signal receiver and semiconductor integrated circuit |
| EP2045926A1 (en) * | 2006-06-28 | 2009-04-08 | Panasonic Corporation | Adjacent channel interference detecting apparatus and method |
| CN101800609A (en) * | 2010-02-03 | 2010-08-11 | 华为终端有限公司 | Method and device for displaying disturbance degree of environmental noise |
| CN102404059A (en) * | 2010-08-04 | 2012-04-04 | 宏旸科技股份有限公司 | Automatic gain control system with dual-RSSI interference detection |
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Denomination of invention: Method for determining main signals of time division signals and method for detecting strength of main signals Effective date of registration: 20190425 Granted publication date: 20160113 Pledgee: Bank of Nanjing, Limited by Share Ltd, Nanjing branch Pledgor: Nanjing seengen Technology Development Co. Ltd. Registration number: 2019320000200 |
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Date of cancellation: 20200727 Granted publication date: 20160113 Pledgee: Bank of Nanjing Limited by Share Ltd. Nanjing branch Pledgor: NANJING SENGEN TECHNOLOGY DEVELOPMENT Co.,Ltd. Registration number: 2019320000200 |