CN112910576B - DDC power statistics equivalent bit error rate test method - Google Patents
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Abstract
The invention discloses a digital down-conversion DDC power statistics equivalent bit error rate test method, which comprises the following steps: suppressing interference signals outside a receiver IBW to be tested; adjusting the power of an interference source to ensure that the error rate is critical to the internal control standard of a selected anti-interference index; closing the output signal of useful signal source, keeping the output signal of interference signal source open, reading DDC power statistic value as the threshold value P of test normal (ii) a Connecting a signal source with a receiving antenna port of a receiver to be tested, closing a signal source output signal, reading a DDC power statistic value at the moment, wherein the DDC power statistic value is only the bottom noise power P existing in the IBW noise (ii) a According to the corresponding standard blocking test index requirement, configuring a signal source to deviate from receiving a useful signal; reading DDC power statistic P at the moment blockn If P is blockn ＞P normal If so, judging that the blockage index is unqualified; otherwise, the blocking indicator is qualified.
Description
Technical Field
The invention relates to the field of radio frequency transceivers, in particular to a DDC power statistics equivalent bit error rate test method.
Background
The radio frequency transceiver generally comprises main modules such as a baseband processing board, a digital transceiver integrated board, a power amplifier, a duplexer, a power supply and the like. The function is mainly divided into two parts: a receiver part, a transmitter part.
The receiver part filters, amplifies, down converts, filters and then amplifies radio frequency signals received by an antenna and transmitted by terminal users such as a mobile station and the like into intermediate frequency signals with proper level, performs A/D conversion, digital down conversion and digital filtering, separates I/Q signals and transmits the signals to a baseband processing board.
The transmitter part receives a downlink baseband I/Q signal transmitted by the baseband processing board, converts the downlink baseband I/Q signal into an intermediate frequency signal after molding filtering and digital up-conversion (DUC) processing and DPD processing by a DAC, converts the intermediate frequency signal into a radio frequency small signal through IQ modulation, amplifies and filters the radio frequency small signal, amplifies the radio frequency small signal through a power amplifier, transmits the radio frequency small signal to a corresponding sector through a duplexer by an antenna, and simultaneously utilizes a feedback signal to finish the detection of the power intensity of a transmitted signal.
The performance of a transmitting-receiving channel is generally evaluated by testing a digital transmitting-receiving integrated board, and the radio frequency index of the whole machine is evaluated by testing the radio frequency transceiver. On one hand, the receiver part of the radio frequency transceiver needs to use 3 special signal sources, the number of receiving channels is large, and the number of test indexes is large, so that the radio frequency index test efficiency of the receiver of the radio frequency transceiver is low. On the other hand, because the receiver index of the narrowband radio frequency transceiver is severe, a plurality of discrete devices, such as a PLL, a mixer, a filter, a small signal amplifier, etc., are used during design, which affects the consistency of the receiver radio frequency index of the radio frequency transceiver.
Disclosure of Invention
The invention mainly aims to provide a DDC power statistics equivalent error rate test method which can effectively improve the first pass rate and efficiency of the receiver radio frequency index test of a radio frequency transceiver.
The technical scheme adopted by the invention is as follows:
the method for testing the digital down-conversion DDC power statistics equivalent bit error rate comprises the following steps:
suppressing interference signals outside the receiver IBW to be tested;
adjusting the power of an interference source to ensure that the error rate is critical to the internal control standard of a selected anti-interference index;
closing the output signal of useful signal source, keeping the output signal of interference signal source open, reading DDC power statistic value as the threshold value P of test normal ；
Connecting a signal source with a receiving antenna port of a receiver to be tested, configuring relevant parameters, closing a signal source output signal, and reading a DDC power statistic value which is only the bottom noise power P existing in the IBW noise ；
According to the corresponding standard blocking test index requirement, the deviation of the signal source from receiving the useful signal f is configured RX N is a value determined according to the requirement of a corresponding standard blockage test index;
reading DDC power statistic P at the moment blockn If P is blockn ＞P normal If so, judging that the blockage index is unqualified; if P blockn ≤P normal And judging that the blockage index is qualified.
According to the technical scheme, interference signals except IBW are specifically suppressed through an intermediate frequency filter of an analog part of the receiver to be tested.
And performing secondary filtering on the interference signal through a sub-band filter of the digital down-conversion according to the technical scheme, and further inhibiting the interference signals except the IBW.
In connection with the above technical solution, the method further comprises the steps of:
locating the spurious signal frequency: when the DDC power statistic value of a certain anti-interference index is larger than a threshold value P normal If the anti-interference index is not qualified, judging that the anti-interference index is not qualified; the reject frequency of the ineligible term is F block error Then through the pair F block error And carrying out DDC power statistics on adjacent frequencies, and positioning to the frequency of the spurious signal on the receiver to be tested.
With the above technical solution, the locating the frequency of the spurious signal specifically includes:
if the blocking frequency F is not qualified block error DDC power statistic value is higher than threshold value, carrier diversity frequency configuration is kept unchanged, output signal power of interference signal source is kept unchanged, output signal frequency of interference signal source is stepped by certain frequency and is respectively close to carrier configuration frequency F 0 And away from carrier configuration frequency F 0 Carrying out frequency sweep test, and simultaneously reading the DDC power statistic value at the moment;
the setting frequency of the interference signal source is gradually close to the carrier configuration frequency F 0 When the DDC power statistic value is increased gradually, if the DDC power statistic value is increased gradually, the frequency of the signal source is set to be F 1 Then DDC power statistic increases sharply, and the frequency of output signal of interference signal source is adjusted to approach the carrier configuration frequency F 0 If the DDC power statistic decreases suddenly, the frequency of the spurious signal of the receiver to be tested deviates from the frequency of the main signal by delta (F) 1 -F 0 )；
The setting frequency of the interference signal source is gradually far away from the carrier configuration frequency F 0 When the DDC power statistic value is gradually reduced, if the DDC power statistic value is reduced, the frequency of the signal source is set to be F 2 In the process, the DDC power statistic value is increased suddenly, and the frequency of the output signal of the interference signal source is continuously adjusted to be far away from the carrier configuration frequency F 0 If the DDC power statistic decreases suddenly, the frequency of the spurious signal of the receiver to be tested deviates from the frequency of the main signal by delta (F) 2 -F 0 )。
According to the technical scheme, the number of non-signal power statistical sampling points of DDC power statistics is 7-10.
According to the technical scheme, the main sources of link noise in the IBW comprise: local oscillator phase noise signals are mixed with blocking signals, local oscillator signals are mixed with blocking phase noise signals, and natural noise is generated.
After the signal source is connected with the receiving antenna port of the receiver to be tested, the configured related parameters comprise carrier diversity frequency.
The invention has the following beneficial effects: according to the DDC power statistics equivalent bit error rate test, the noise power value in the IBW can be found by only using one signal source to evaluate the radio frequency index of the digital transceiver integrated board, and whether the blocking index is unqualified or not can be judged by comparing the noise power value with the threshold value of the DDC power statistics. Therefore, the invention effectively improves the test efficiency of evaluating the radio frequency indexes such as the blockage of the receiver, the adjacent channel interference resistance, the intermodulation response interference resistance, the parasitic interference resistance and the like by obtaining the digital down-conversion (DDC) non-signal power in the IBW to be equivalent to the error rate of the receiver.
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The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a diagram illustrating a congestion indicator budget according to an embodiment of the present invention;
FIG. 2 is a flow chart of a DDC power statistics equivalent bit error rate test method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of secondary filtering of a digital down-conversion (DDC) sub-band filter according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating the frequency of a positioning spur according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main sources of link noise in IBW: the local oscillator Phase noise LO mixes with the blocker, the local oscillator LO mixes with the blocker Phase noise, the natural noise and other link noise (LNA, mixer, small signal amplifier, etc.), as shown in fig. 1. As can be seen from fig. 1, the LO Phase noise is mixed with the blocking, and the noise component falling in IBW is larger, and its determinant factor is the LO Phase noise index, therefore, the LO Phase noise index directly affects the receiver noise immunity. The LO mixes with the blocking Phase noise the noise components that fall within the IBW, depending on the single tone signal quality that provides the blocking signal source. Other link noise (LNA, mixer, small signal amplifier, etc.) is small and can be optimized by device selection and link budget.
In summary, the noise power in the IBW directly affects the receiver immunity, and the scheme to be implemented must be able to accurately obtain the noise power value in the IBW, so that the noise power value can be more closely equivalent to the bit error rate of the receiver.
Table 1 below illustrates the budget of the blocking index of the narrowband radio transceiver (TETRA system), mainly considering the effect of reciprocal mixing caused by LO Phase noise (Local oscillator Phase noise), and calculating the noise power in ibw (information bandwidth), thereby obtaining the LO Phase noise index required by the receiver.
Table 1: blockage indicator noise component calculation
While the blocking signal power outside the IBW is much larger than the useful signal power, this part must be filtered out when digital down-conversion (DDC) detects the noise power inside the IBW.
As shown in fig. 2, the method for testing the DDC power statistics equivalent bit error rate in the digital down-conversion according to the embodiment of the present invention includes the following steps:
s1, suppressing interference signals outside the receiver IBW to be tested;
s2, adjusting the power of the interference source to make the bit error rate critical to the internal control standard of a selected anti-interference index;
s3, closing the output signal of the useful signal source and keeping the output signal of the interference signal source open; reading DDC power statistic value at the moment as a checked threshold value P normal ；
S4, connecting the signal source with the receiving antenna port of the receiver to be tested, and configuring related parameters; closing the signal source output signal, reading the DDC power statistic value at the moment, which is the only bottom noise power P existing in the IBW noise ；
S5, according to the corresponding specification blocking test index requirement, configuring the signal source deviating from the receiving useful signal f RX N is a value determined according to the requirement of a corresponding standard blockage test index;
s6, reading DDC power statistic P blockn ；
S7, judgment P blockn ＞P normal ？
S8, if P blockn ＞P normal If the blockage index is not qualified, judging the blockage index to be qualified;
s9, if P blockn ≤P normal And judging that the blockage index is qualified.
In the embodiment of the present invention, step S1 is implemented mainly by performing bandwidth design on an intermediate frequency filter of an analog portion of the receiver to be tested, and designing a sub-band filter of a digital down-conversion (DDC).
Taking a narrow band radio frequency transceiver (TETRA system) as an example, the following design is specifically required to filter interference signals other than IBW:
1. the design bandwidth of the intermediate frequency filter is 30.5kHz, and the out-of-band rejection meets the following requirement 2:
TABLE 2 out-of-band rejection parameters for IF filters
As can be seen from the out-of-band rejection of the intermediate frequency filter, the analog part of the receiver has a certain rejection capability to interference signals other than IBW.
2. The sub-band filter of the digital down-conversion (DDC) performs a second filtering of the interferer (as shown in fig. 3), effectively suppressing-90 dB outside the IBW. The effective bit width of DDC power statistics is 64 bits, and the number of non-signal power statistics sampling points in the embodiment of the invention is 10^ 7. Non-signal power refers to the power of noise signals other than the power of the desired signal within the IBW.
By combining the design characteristics of the receiver, the comprehensive suppression capability of the analog and digital filters is enough to filter out interference power except IBW, and the power obtained by DDC power statistics is the noise power in the IBW. And because the DDC power statistic bit width is 64 bits, the stability of obtaining the effective value in the IBW can be controlled within 0.5 dBFs.
Selecting any one anti-interference index to carry out error rate test, adjusting the power of an interference source to ensure that the error rate is in the internal control standard when approaching, closing the output signal of a useful signal source, keeping the output signal of the interference signal source open, reading a DDC power statistic value P normal Thus, P can be set normal Is the threshold value of the DDC power statistical test of the product. During subsequent measurements, higher than P normal DDC power value of (1) is judged as an unqualified item and is lower than P normal The DDC power statistic of (a) is determined as a qualified item.
In another embodiment of the present invention, the receiver RSSI is taken as an example, and the DDC power statistics equivalent bit error rate test method mainly includes the following steps:
1. the receiver RSSI is calibrated according to specifications, and if there are multiple channel RX (receive) links, the RX link gain should be adjusted so that the RSSI of all RX links remains consistent.
2. The signal source is connected to an RX (receiving) antenna port of the receiver, and the carrier diversity, the frequency (including the number of TX carriers, the number of diversity antennas of the RX and the frequency of the TX carriers) and the like are configuredClosing the output signal of the signal source, reading the DDC power statistic value P noise When only the bottom noise power, P, exists in the IBW noise Should be lower than threshold value P of DDC power check normal . At this time P is not present noise Is equal to P norma The case (1).
3. Equivalent test receiver immunity index (taking TETRA standard ± 50kHz blocking index as an example): according to the requirements of blocking test indexes of TETRA specifications, the signal source is configured to deviate from RX useful signal f RX +/-50 kHz, power-40 dBm (note that line loss is calibrated, and the power is the power reaching an antenna port), and a DDC power statistic P is read block50 。
4. If P block50 ＞P normal If so, judging that the blockage index is unqualified; if P block50 ≤P normal And judging that the blockage index is qualified.
For receiver DDC power statistic value P under the configuration block50 The analysis was carried out:
a. blocking power: after the signal source blocking signal is mixed with the LO, its frequency is still 50K away from the intermediate frequency, and is filtered by the intermediate frequency filter and the sub-band filter of the digital down-conversion (DDC).
b. Blocking phase noise power: the blocking is provided by a signal source, theoretically a single-tone signal of 1Hz (the single-tone signal is a single-carrier sine wave signal output by the signal source, the frequency is determined by the signal source setting, the theoretical bandwidth is 1Hz), but actually, phase noise exists, and the blocking signal enters an antenna port of the receiver, is amplified by RX low-noise amplifier and is blocked (the frequency is f) RX ± 50kHz) noise signal is mixed with the LO, whose frequency is within the intermediate frequency IBW and cannot be filtered out.
Lo Phase noise: LO Phase noise is critical to receiver immunity, and LO Phase (50kHz) is mixed with the blocking signal input by the signal source, and its frequency is within the intermediate frequency IBW and cannot be filtered.
d. Other noise power: natural noise, noise introduced by low noise amplifiers, power supplies, mixers, etc.
It can be seen from the analysis process that the noise power of DDC power statistics is mainly: blocking signal (frequency f) RX ±50kHz) Phase noise signal is mixed with LO Phase noise (50kHz) and blocking signal (frequency f) RX ± 50 kHz). The influence of signal source noise is eliminated, and other noise comes from internal devices of the receiver, so that the noise immunity of the receiver can be effectively evaluated by acquiring a DDC power value.
According to the method for evaluating the DDC power statistics of the +/-50 kHz blocking signals, the blocking indexes of +/-100 kHz, +/-200 kHz, +/-500 kHz and the like of other frequency points are respectively evaluated. Similarly, according to the TETRA standard, the adjacent channel immunity, the immunity corresponding to intermodulation, the immunity indexes such as higher harmonics and the like can be evaluated by the same method.
5. Locating the spurious signal frequency: when the DDC power statistic value of a certain index is larger than the threshold value P normal And judging that the index is unqualified. The reject frequency of the ineligible term is F block error Through the pair F block error DDC power statistics is performed adjacent to frequencies, which can quickly and efficiently locate spurious signal frequencies at the receiver. The specific method comprises the following steps:
frequency F when evaluating receiver immunity index for ddc power statistics block error DDC power statistic above a threshold value, F block error It is not necessarily the spurious signal frequency, but may be the spurious signal of adjacent frequencies causing F block error The noise power increases at frequency.
b. Keeping the carrier diversity frequency configuration unchanged, keeping the power of the output signal of the interference signal source unchanged, stepping the frequency of the output signal of the interference signal source by 1kHz (which can be properly adjusted according to the actual condition of the product), and respectively approaching the carrier configuration frequency F 0 And away from carrier configuration frequency F 0 And carrying out frequency sweep test, and simultaneously reading the DDC power statistic value at the moment.
The setting frequency of the interference signal source is gradually close to the carrier configuration frequency F 0 In time, DDC power statistics gradually increase. If in the process, the signal source frequency is set to F 1 In the process, the DDC power statistic value is increased suddenly, and the frequency of the output signal of the interference signal source is continuously adjusted to be close to the carrier configuration frequency F 0 If the DDC power statistic decreases suddenly, it indicates that the spurious signal frequency of the receiver deviates from the main signal frequency△(F 1 -F 0 )。
The setting frequency of the interference signal source is gradually far away from the carrier configuration frequency F 0 In time, DDC power statistics gradually decrease. If in the process, the frequency of the signal source is set to F 2 In the process, the DDC power statistic value is increased suddenly, and the frequency of the output signal of the interference signal source is continuously adjusted to be far away from the carrier configuration frequency F 0 If the DDC power statistic decreases abruptly, it indicates that the frequency of the spurious signal of the receiver deviates from the frequency of the main signal by delta (F) 2 -F 0 )。
c. As shown in FIG. 3, the frequencies of the 3 blocking signals are F block1 、F block2 And F block3 The corresponding DDC power statistics values are respectively P block1 、P block2 And P block3 . If there is no spurious signal, P block3 ＞P block2 ＞P block1 . However, as can be seen from fig. 3, the noise power value P falling within IBW after mixing of 3 blocking signals block2 ＞P block3 ＞P block1 From this, the frequency F of the spurious signal is known block2 Causing abrupt changes in the noise power within the IBW, and therefore the spur frequency deviates from the main signal frequency Delta (F) block2 -F 0 ) Relative power Δ P blockerror ＝P block2 -P normal 。
It will be appreciated that modifications and variations are possible to those skilled in the art in light of the above teachings, and it is intended to cover all such modifications and variations as fall within the scope of the appended claims.
Claims (8)
1. A digital down-conversion DDC power statistics equivalent bit error rate test method is characterized by comprising the following steps:
suppressing interference signals outside a receiver IBW to be tested;
adjusting the power of an interference source to ensure that the error rate is critical to the internal control standard of a selected anti-interference index;
closing the output signal of useful signal source, keeping the output signal of interference signal source on, and reading the DDC power statistic value as testIs threshold value P normal ；
Connecting a signal source with a receiving antenna port of a receiver to be tested, configuring relevant parameters, closing a signal source output signal, reading a DDC power statistic value which is only the bottom noise power P in the IBW noise ；
According to the corresponding standard blocking test index requirement, the deviation of the signal source from receiving the useful signal f is configured RX N is a value determined according to the requirement of a corresponding standard blockage test index;
reading DDC power statistic P at the moment blockn If P is blockn ＞P normal If so, judging that the blockage index is unqualified; if P blockn ≤P normal And judging that the blockage index is qualified.
2. The DDC power statistics equivalent bit error rate test method of claim 1, wherein interference signals outside IBW are suppressed by an intermediate frequency filter of an analog part of a receiver to be tested.
3. The DDC power statistics equivalent bit error rate test method of claim 2, wherein the interference signal is secondarily filtered by a sub-band filter of digital down-conversion to further suppress the interference signal other than IBW.
4. A digital down-conversion DDC power statistics equivalent bit error rate test method according to any of claims 1-3, characterized in that the method further comprises the steps of:
locating the spurious signal frequency: when the DDC power statistic value of a certain anti-interference index is larger than a threshold value P normal Judging that the anti-interference index is unqualified; the reject frequency of the ineligible term is F blockerror Then through the pair F blockerror And carrying out DDC power statistics on adjacent frequencies, and positioning to the frequency of the spurious signal on the receiver to be tested.
5. The method according to claim 4, wherein locating the spur frequency specifically comprises:
if the blocking frequency F is not qualified blockerror DDC power statistic value is higher than threshold value, carrier diversity frequency configuration is kept unchanged, output signal power of interference signal source is kept unchanged, output signal frequency of interference signal source is stepped by certain frequency and is respectively close to carrier configuration frequency F 0 And away from carrier configuration frequency F 0 Carrying out frequency sweep test, and simultaneously reading the DDC power statistic value at the moment;
the setting frequency of the interference signal source is gradually close to the carrier configuration frequency F 0 When the DDC power statistic value is increased gradually, if the DDC power statistic value is increased gradually, the frequency of the signal source is set to be F 1 Then DDC power statistic increases sharply, and the frequency of output signal of interference signal source is adjusted to approach the carrier configuration frequency F 0 If the DDC power statistic decreases suddenly, the frequency of the spurious signal of the receiver to be tested deviates from the frequency of the main signal by delta (F) 1 -F 0 )；
The setting frequency of the interference signal source is gradually far away from the carrier configuration frequency F 0 When the DDC power statistic value is gradually reduced, if the DDC power statistic value is reduced, the frequency of the signal source is set to be F 2 In the process, the DDC power statistic value is increased suddenly, and the frequency of the output signal of the interference signal source is continuously adjusted to be far away from the carrier configuration frequency F 0 If the DDC power statistic decreases suddenly, the frequency of the spurious signal of the receiver to be tested deviates from the frequency of the main signal by delta (F) 2 -F 0 )。
6. The method according to claim 1, wherein the number of non-signal power statistical sampling points of DDC power statistics is 7-10.
7. The method according to claim 1, wherein the main sources of link noise in IBW include: local oscillator phase noise signals are mixed with blocking signals, local oscillator signals are mixed with blocking phase noise signals, and natural noise is generated.
8. The DDC power statistics equivalent bit error rate testing method of claim 1, wherein after connecting the signal source with the receiving antenna port of the receiver to be tested, the configured related parameters comprise carrier diversity frequency.
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