CN1996801B - A method and device for obtaining the performance parameters of the wireless receiver - Google Patents
A method and device for obtaining the performance parameters of the wireless receiver Download PDFInfo
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Abstract
This invention discloses one method and device to get wireless receiver property parameters, which converts measurement signals into digital IQ signals and gets digital zone signal power and wave quality factors according to the IQ signals and then gets output signal power from receiver according to the digital zone signal power and gets receiver property parameter according to the signal power. This invention shall not need to preserve test mouth on the circuit board through special device to test receiver property parameters.
Description
Technical field
The present invention relates to the less radio-frequency reception technique, refer to a kind of method and device that obtains the radio receiver performance parameter especially.
Background technology
In the wireless communication system, the basic function of radio-frequency receiving system is exactly, and will be down-converted to the IQ signal by the signal that antenna receives, and sends base band demodulating then to.In radio-frequency receiving system, because receiver is when receiving useful signal, therefore the interference that also can receive various unwanted signals, need be estimated the performance parameter of wireless receiver, so that get rid of interfere information effectively.
The receiver performance parameter is more, such as second order intermodulation performance parameter, image signal rejection parameter, phase noise etc., is that example is described below respectively with these three kinds of receiver performance parameters below.
(1) second order intermodulation performance parameter.
Because the existence of receiver nonlinear characteristic, the outer large-signal of the band of receiver inlet is after passing through receiver, and its non-linear intermodulation component might appear in the output band, thus the useful signal quality that influence receives.When there was the outer interference signal of a big band in receiving terminal, this band interference signal outward can be a second order intermodulation characteristic by the receiver second nonlinear, appears in the useful signal band of output.
Quantitative evaluation for second order intermodulation performance obtains by second order intermodulation cut-off point IIP2, the calculating of second order intermodulation cut-off point as shown in Equation (1):
IIP2＝2P
BLOCK-IM2 (1)
Wherein, P
BLOCKBeing the outer interfering signal power of band of receiver inlet, is the given value by the agreement regulation; IM2 is the outer interference signal of this band by the power of the second order intermodulation component that produces at output behind the receiver second nonlinear.
(2) image signal rejection parameter.
For the receiver of a non-zero if, the local oscillation signal frequency of supposing receiver is f
LO, the output intermediate frequency of receiver is f
I, so, under the normal condition, the operating frequency f of receiver
CShown in formula (2):
f
C＝f
LO+f
I (2)
Suppose that it is f that there is a frequency in receiver inlet
LO-f
IInterference signal because the characteristic of frequency mixer in the radio-frequency receiving system, after this interference signal input mixer mixing, can produce intermediate frequency at output equally be f
IMiddle frequency interference signal, obviously should in frequency interference signal can influence the performance of system greatly.Because the frequency of this input-terminal disturbance signal is with f with normal operating frequency just
LOBe the image signal at center, so this interference signal is also referred to as image signal.Inhibition to image signal is one of important performance of radio-frequency receiving system.
To the evaluation process of image signal rejection, be by input input mirror image signal at radio-frequency transmitter, the measurement of output end at receiver obtains the middle frequency interference signal that is produced by image signal then.
(3) phase noise.
In the whole radio-frequency receiving system, there are two inputs in frequency mixer, the signal that the input input receives by antenna, another input input local oscillation signal.Under the perfect condition, local oscillation signal is a clean single-tone, and in the practical application, also there is bigger sideband in local oscillation signal, and this sordid sideband of local oscillation signal is also referred to as phase noise.Like this, when the signal that receives by antenna is carried out down-conversion, not only can the down-conversion useful signal, interference signal that also can the opposite side band portion is carried out down-conversion simultaneously.Fig. 1 a is actual local oscillation signal schematic diagram.
At present, in order to obtain above-mentioned receiver performance parameter, be to obtain by on the circuit board of receiver place equipment, reserving test port, measuring by special test equipment.
Such as, in order to obtain IM2, need on the circuit board of portable terminal, reserve test port, at the P of the input of receiver input as measuring-signal
BLOCK, measure at test port by instrumentation then and obtain IM2, calculate according to formula (1) again and obtain second order intermodulation cut-off point IIP2.For another example, in order to obtain middle frequency interference signal, need on the circuit board of portable terminal, reserve test port, at the image signal of the input of receiver input as measuring-signal, by the power of instrumentation frequency interference signal in the test port measurement obtains, the frequency interference signal equivalence just obtains the mirror image rejection to the power that input deducts image signal later on again in will being somebody's turn to do afterwards then.And for example, in order to obtain phase noise, need on the circuit board of portable terminal, reserve test port, import respectively with the local oscillator centre frequency at the input of receiver and to differ 100Hz, 1KHz, 10KHz, the measuring-signal of the power of 100KHz and 1MHz sideband, by the phase noise of instrumentation at the power of corresponding above-mentioned each sideband of test port measurement acquisition, shown in Fig. 1 b, Fig. 1 b is based on the phase noise change curve schematic diagram of the local oscillation signal of Fig. 1 a then.
Obtain the method for receiver performance parameter from prior art, need on the circuit board of receiver place equipment, reserve test port, measure by instrumentation, on the one hand, the test port of reserving is general bigger, take the area of circuit board, so directly hindered the small sizeization of receiver place equipment; On the other hand, instrumentation costs an arm and a leg, and makes measurement become complicated, inconvenience.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of obtaining the radio receiver performance parameter, can simply obtain the radio receiver performance parameter, and does not influence the small sizeization of receiver place equipment.
Another object of the present invention is to provide a kind of device that obtains the radio receiver performance parameter, can simply obtain the radio receiver performance parameter, and do not influence the small sizeization of receiver place equipment.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of method of obtaining the radio receiver performance parameter, this method comprises:
A. measuring-signal is converted to digital homophase and quadrature IQ signal, and obtains the signal power and the waveform quality factor of numeric field according to this numeral IQ signal;
B. according to the signal power and the waveform quality factor of the numeric field that obtains, obtain the signal power of receiver output, comprising:
B1. determine the described figure place that measuring-signal is converted to the A/D conversion of digital IQ signal, and the high level corresponding voltage value, according to signal power and the figure place of A/D conversion and the analog signal power of the output that obtains the A/D conversion that the high level corresponding voltage value is determined of the numeric field that obtains;
B2. according to the analog signal power of the output of described waveform quality factor and A/D conversion, the analog signal power of input that obtains the A/D conversion is as the signal power of receiver output;
C. according to the signal power of the receiver output that obtains, obtain the receiver performance parameter.
The method of obtaining the signal power of numeric field described in the steps A is: calculate the in-phase component of the described digital IQ signal of changing through modulus A/D and square sum of quadrature component.
The method of obtaining the waveform quality factor described in the steps A is:
Obtain training sequence in every time slot signal according to described measuring-signal,, obtain the IQ sequence after the A/D conversion, calculate according to described training sequence and IQ sequence again and obtain the waveform quality factor according to digital IQ signal.
The method of analog signal power of obtaining the output of A/D conversion described in the step B1 is: that calculates described magnitude of voltage square obtains first value with the merchant of system impedance, that calculates the signal power of described numeric field and 2 described figure place power square obtains second value, and it is long-pending to calculate described first value and second value again.
The method of analog signal power of obtaining the input of A/D conversion described in the step B2 is: the analog signal power that calculates the output of described A/D conversion amasss with the waveform quality factor is.
The method of obtaining the receiver performance parameter described in the step C is:
Outside described measuring-signal is the band of receiver inlet during interfering signal power, described receiver performance parameter is a second order intermodulation performance parameter, and acquisition methods is: the signal power that the outer interfering signal power of band that calculates twice and the receiver of described acquisition are exported poor;
When measuring-signal was image signal, described receiver performance parameter was an image signal rejection parameter, and acquisition methods is: with the equivalent signal power to input of the signal power of described receiver output, deduct image signal power again;
When measuring-signal when differing the power signal of predeterminated frequency sideband with the local oscillator centre frequency, described receiver performance parameter is a phase noise, this phase noise be the signal power that the receiver of the power signal of corresponding input sideband is exported.
A kind of device that obtains the radio receiver performance parameter, this device comprises: numeric field signal power acquisition module, waveform quality factor acquisition module, receiver output signal power acquisition module, and receiver performance parameter acquisition module, wherein,
Numeric field signal power acquisition module receives measuring-signal, carries out A/D and is converted to digital IQ signal, gives receiver output signal power acquisition module according to digital IQ calculated signals that obtains and the signal power P0 that exports numeric field;
Waveform quality factor acquisition module receives measuring-signal, obtains the training sequence in every time slot signal; Reception is from the digital IQ signal of numeric field signal power acquisition module, obtains the IQ sequence after the A/D conversion, according to described training sequence with the IQ sequence is calculated and the output waveform quality factor are given receiver output signal power acquisition module;
Receiver output signal power acquisition module receives the signal power P from the numeric field of numeric field signal power acquisition module
0, receive waveform quality factor from waveform quality factor acquisition module, calculate the signal power of also output receiver output and give the receiver performance parameter acquisition module;
The receiver performance parameter acquisition module receives the signal power from the receiver output of receiver output signal power acquisition module, calculates the receiver performance parameter according to existing computational methods.
Described measuring-signal is the outer interfering signal power of the band of receiver inlet or image signal or differs the power signal of predeterminated frequency sideband with the local oscillator centre frequency.
Described receiver performance parameter is second order intermodulation performance parameter or image signal rejection parameter or phase noise.
As seen from the above technical solution, the present invention is by being converted to measuring-signal digital homophase and quadrature (IQ) signal, and obtain the signal power and the waveform quality factor of numeric field according to this numeral IQ signal, again according to the signal power and the waveform quality factor of the numeric field that obtains, obtain the signal power of receiver output, and, obtain the receiver performance parameter according to this signal power.As seen, the present invention need not reserve test port on the circuit board of receiver place equipment, come the measuring receiver performance parameter by instrumentation, like this, on the one hand, has guaranteed the small size demand of receiver place equipment; On the other hand,, make that the measurement cost is low owing to do not need instrumentation, and simple, convenient.
Description of drawings
Fig. 1 a is actual local oscillation signal schematic diagram;
Fig. 1 b is based on the phase noise change curve schematic diagram of the local oscillation signal of Fig. 1 a;
Fig. 2 is the flow chart of the inventive method;
Fig. 3 is the corresponding relation that the simulated power of the digital power that measures of numeric field and analog domain subtracts;
Fig. 4 is the structural representation of apparatus of the present invention.
Embodiment
Core concept of the present invention is: measuring-signal is converted to digital IQ signal, and obtains the signal power and the waveform quality factor of numeric field according to this numeral IQ signal; According to the signal power and the waveform quality factor of the numeric field that obtains, obtain the signal power of receiver output, and, obtain the receiver performance parameter according to this signal power.
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing preferred embodiment that develops simultaneously, the present invention is described in more detail.
Fig. 2 is the flow chart of the inventive method, and as shown in Figure 2, the inventive method may further comprise the steps:
Step 200: measuring-signal is converted to digital IQ signal, and obtains the signal power and the waveform quality factor of numeric field according to this numeral IQ signal.
According to the basic communication principle, the signal that receiver receives obtains digital IQ signal, at the resulting signal power P of numeric field after changing by modulus (A/D)
0As shown in Equation (3):
P
0＝I
2+Q
2 (3)
P
0Comprise available signal power and interfering signal power, I is the in-phase component of digital IQ signal, and Q is the quadrature component of digital IQ signal.
The waveform quality factor ρ of signal is as shown in Equation (4):
Wherein, P
SThe signal power P of the numeric field that the expression receiver receives
0In available signal power.
System is an example with Time Division-Synchronous Code Division Multiple Access (TD-SCDMA), waveform quality factor ρ obtains the training sequence that can utilize 144 chip lengths in every time slot signal, by being carried out related operation, described digital IQ signal obtains, waveform quality factor ρ obtains the technology as well known to those skilled in the art that belongs to, specific implementation repeats no more here, can be referring to related data.Suppose that in the resulting IQ sequence in A/D conversion back be Z
k, and training sequence is R
0k, then waveform quality factor ρ after carrying out related calculation as shown in Equation (5):
Wherein, k=1 ... 144.
Step 201:, obtain the signal power of receiver output according to the signal power and the waveform quality factor of the numeric field that obtains.
What receiver was exported is analog signal, and in order to obtain the signal power of receiver output, the digital power that numeric field need be measured is converted to the simulated power of analog domain.
Fig. 3 is the corresponding relation between the simulated power of the digital power that measures of numeric field and analog domain, as shown in Figure 3, is 13bit with A/D conversion figure place, and high level 1 corresponding 0.55V voltage is example, the signal power P of the numeric field after the A/D conversion
0With its corresponding simulating power P
0, aRelation as shown in Equation (6):
Wherein, 50 for system impedance is 50 Ω, and 8192 is 13 powers of 2.Can get according to formula (6),
The available signal power that formula (7) substitution formula (4) can be got the analog domain that receiver receives is shown in the formula (8):
P
S，a＝P
0，a·ρ (8)
P in the formula (8)
S, aBe the signal power of receiver output.
Step 202:, obtain the receiver performance parameter according to the signal power of the receiver output that obtains.
Signal power according to the receiver of formula (8) acquisition is exported can obtain the receiver performance parameter according to existing computational methods.
Such as, when measuring-signal is P
BLOCKThe time, the signal power that the receiver that obtains is exported can obtain second order intermodulation cut-off point IIP2 as IM2 substitution formula (1), thereby obtains second order intermodulation performance parameter;
For another example, when measuring-signal was image signal, the equivalent signal power to input of signal power with the receiver that obtains is exported deducted image signal power again, thereby obtains image signal rejection parameter;
And for example, when measuring-signal for to differ predeterminated frequency such as 100Hz with the local oscillator centre frequency, 1KHz, 10KHz, during the power signal of 100KHz and 1MHz equiband, the signal power of the receivers output of the power signal of corresponding respectively different input sidebands is the out of phase noise of acquisition.
From the inventive method as seen,, obtained the receiver performance parameter easily, and need not on the circuit board of receiver place equipment, to reserve test port, measured by instrumentation by the receiver output signal power.Like this, on the one hand, guaranteed the small size demand of receiver place equipment; On the other hand,, make that the measurement cost is low owing to do not need instrumentation, and simple, convenient.
Fig. 4 is the structural representation of apparatus of the present invention, and as shown in Figure 4, at the invention described above method, this device comprises:
Numeric field signal power acquisition module receives measuring-signal, carries out A/D and is converted to digital IQ signal, according to digital IQ calculated signals that obtains and the signal power P that exports numeric field
0Give receiver output signal power acquisition module;
Waveform quality factor acquisition module receives measuring-signal, obtains the training sequence in every time slot signal; Reception is from the digital IQ signal of numeric field signal power acquisition module, obtains the IQ sequence after the A/D conversion, according to described training sequence with the IQ sequence is calculated and output waveform quality factor ρ gives receiver output signal power acquisition module;
Receiver output signal power acquisition module receives the signal power P from the numeric field of numeric field signal power acquisition module
0, receive waveform quality factor ρ from waveform quality factor acquisition module, calculate the signal power of also output receiver output and give the receiver performance parameter acquisition module;
The receiver performance parameter acquisition module receives the signal power from the receiver output of receiver output signal power acquisition module, calculates the receiver performance parameter according to existing computational methods.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a method of obtaining the radio receiver performance parameter is characterized in that, this method comprises:
A. measuring-signal is converted to digital homophase and quadrature IQ signal, and obtains the signal power and the waveform quality factor of numeric field according to this numeral IQ signal;
B. according to the signal power and the waveform quality factor of the numeric field that obtains, obtain the signal power of receiver output, comprising:
B1. determine the described figure place that measuring-signal is converted to the A/D conversion of digital IQ signal, and the high level corresponding voltage value, according to signal power and the figure place of A/D conversion and the analog signal power of the output that obtains the A/D conversion that the high level corresponding voltage value is determined of the numeric field that obtains;
B2. according to the analog signal power of the output of described waveform quality factor and A/D conversion, the analog signal power of input that obtains the A/D conversion is as the signal power of receiver output;
C. according to the signal power of the receiver output that obtains, obtain the receiver performance parameter.
2. method according to claim 1 is characterized in that, the method for obtaining the signal power of numeric field described in the steps A is: calculate the in-phase component of the described digital IQ signal of changing through modulus A/D and square sum of quadrature component.
3. method according to claim 1 is characterized in that, the method for obtaining the waveform quality factor described in the steps A is:
Obtain training sequence in every time slot signal according to described measuring-signal,, obtain the IQ sequence after the A/D conversion, calculate according to described training sequence and IQ sequence again and obtain the waveform quality factor according to digital IQ signal.
4. method according to claim 1, it is characterized in that, the method of analog signal power of obtaining the output of A/D conversion described in the step B1 is: that calculates described magnitude of voltage square obtains first value with the merchant of system impedance, that calculates the signal power of described numeric field and 2 described figure place power square obtains second value, and it is long-pending to calculate described first value and second value again.
5. method according to claim 4 is characterized in that, the method for analog signal power of obtaining the input of A/D conversion described in the step B2 is: the analog signal power that calculates the output of described A/D conversion amasss with the waveform quality factor is.
6. method according to claim 1 is characterized in that, the method for obtaining the receiver performance parameter described in the step C is:
Outside described measuring-signal is the band of receiver inlet during interfering signal power, described receiver performance parameter is a second order intermodulation performance parameter, and acquisition methods is: the signal power that the outer interfering signal power of band that calculates twice and the receiver of described acquisition are exported poor;
When measuring-signal was image signal, described receiver performance parameter was an image signal rejection parameter, and acquisition methods is: with the equivalent signal power to input of the signal power of described receiver output, deduct image signal power again;
When measuring-signal when differing the power signal of predeterminated frequency sideband with the local oscillator centre frequency, described receiver performance parameter is a phase noise, this phase noise be the signal power that the receiver of the power signal of corresponding input sideband is exported.
7. device that obtains the radio receiver performance parameter, it is characterized in that this device comprises: numeric field signal power acquisition module, waveform quality factor acquisition module, receiver output signal power acquisition module, and receiver performance parameter acquisition module, wherein
Numeric field signal power acquisition module receives measuring-signal, carries out A/D and is converted to digital IQ signal, according to digital IQ calculated signals that obtains and the signal power P that exports numeric field
0Give receiver output signal power acquisition module;
Waveform quality factor acquisition module receives measuring-signal, obtains the training sequence in every time slot signal; Reception is from the digital IQ signal of numeric field signal power acquisition module, obtains the IQ sequence after the A/D conversion, according to described training sequence with the IQ sequence is calculated and the output waveform quality factor are given receiver output signal power acquisition module;
Receiver output signal power acquisition module receives the signal power P from the numeric field of numeric field signal power acquisition module
0, receive waveform quality factor from waveform quality factor acquisition module, calculate the signal power of also output receiver output and give the receiver performance parameter acquisition module;
The receiver performance parameter acquisition module receives the signal power from the receiver output of receiver output signal power acquisition module, calculates the receiver performance parameter according to existing computational methods.
8. device according to claim 7 is characterized in that, described measuring-signal is the outer interfering signal power of the band of receiver inlet or image signal or differs the power signal of predeterminated frequency sideband with the local oscillator centre frequency.
9. method according to claim 7 is characterized in that, described receiver performance parameter is second order intermodulation performance parameter or image signal rejection parameter or phase noise.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6885853B2 (en) * | 2001-04-11 | 2005-04-26 | National Scientific Corporation | Communications receiver with integrated IF filter and method therefor |
| CN1759583A (en) * | 2003-03-12 | 2006-04-12 | 皇家飞利浦电子股份有限公司 | Transceiver with I/Q mismatch compensation scheme |
| CN1870473A (en) * | 2005-10-21 | 2006-11-29 | 华为技术有限公司 | Passive intermodulation testing method of mobile communication base station system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6885853B2 (en) * | 2001-04-11 | 2005-04-26 | National Scientific Corporation | Communications receiver with integrated IF filter and method therefor |
| CN1759583A (en) * | 2003-03-12 | 2006-04-12 | 皇家飞利浦电子股份有限公司 | Transceiver with I/Q mismatch compensation scheme |
| CN1870473A (en) * | 2005-10-21 | 2006-11-29 | 华为技术有限公司 | Passive intermodulation testing method of mobile communication base station system |
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