WiFi (Wireless Fidelity) 7 radio frequency testing device
By designing a WiFi 7 RF test device that includes a signal generator, spread spectrum module, and tester, the problem that existing devices cannot meet the testing requirements of WiFi 7 is solved. This device enables RF testing of WiFi 7 devices, covering higher frequency bands and wider bandwidths, and evaluates the performance of devices in complex environments.
Patent Information
- Application Number
- CN202520035683.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-08
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-01-08
AI Technical Summary
Existing WiFi radio frequency testing equipment cannot meet the testing requirements of WiFi 7 technology, especially in terms of frequency band, speed and throughput.
A WiFi 7 radio frequency test device was designed, including a signal generator, a spread spectrum module, a first tester, and a test monitoring device. The spread spectrum module improves the frequency range and bandwidth of the test signal to meet the testing requirements of WiFi 7, and the first and second testers test the performance of the received and transmitted signals.
It enables radio frequency testing of WiFi 7 devices, covering higher frequency bands, supports reception performance testing with a bandwidth of 320 MHz, evaluates device performance in complex interference environments, and ensures stable connection of devices under higher data rates and lower signal strength.
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Figure CN223786066U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of WiFi radio frequency test, in particular to a WiFi7 radio frequency test device. BACKGROUND
[0002] WiFi 7 is a new generation of WiFi technology based on WiFi 6, which introduces 320MHz bandwidth, 4096-QAM, multi-link operation, enhanced MU-MIMO, multi-AP cooperation and other technologies. WiFi 7 can provide higher data transmission rate and lower latency compared to WiFi 6.
[0003] In related technologies, the WiFi radio frequency test device cannot meet the test requirements of WiFi 7 technology, such as frequency band, rate and throughput tests. CONTENT OF THE UTILITY MODEL
[0004] The present application aims to at least solve one of the technical problems existing in the prior art, and provides a WiFi7 radio frequency test device, which aims to meet the test requirements of WiFi 7 technology and realize the radio frequency test of WiFi 7 device.
[0005] In a first aspect, the embodiments of the present application provide a WiFi7 radio frequency test device, comprising: a signal generator, a spread spectrum module, a first test instrument and a test monitoring device.
[0006] The signal generator is configured to generate a test signal.
[0007] The spread spectrum module is connected between the signal generator and the device under test, and is configured to increase the frequency of the test signal, so that the test signal received by the device under test meets the WiFi7 radio frequency test requirements.
[0008] The first test instrument is connected to the device under test, and is configured to test the performance of the received signal of the device under test.
[0009] The test monitoring device is connected to the first test instrument, and is configured to collect test data and analyze test results.
[0010] According to the technical scheme of the embodiments of the present application, at least the following beneficial effects are obtained: since WiFi 7 technology introduces 320MHz bandwidth, if the radio frequency test of WiFi 7 related terminal device is to be realized, the test device needs to support a larger frequency range and bandwidth; based on this, the spread spectrum module connected between the signal generator and the device under test increases the frequency of the test signal generated by the signal generator, so that the test device can cover a higher frequency band, thereby meeting the test requirements of WiFi 7 technology and realizing the radio frequency test of WiFi 7 device.
[0011] According to some embodiments of the present application, a second tester is further included, connected between the spread spectrum module and the test monitoring device, for testing the performance of the signal transmitted by the device under test.
[0012] According to some embodiments of the present application, the spread spectrum module includes a first frequency conversion subsystem, for processing the signal transmitted by the device under test, so that the second tester tests the performance of the signal transmitted by the device under test.
[0013] According to some embodiments of the present application, the spread spectrum module includes a second frequency conversion subsystem, for generating an oscillation signal and mixing the oscillation signal with the test signal to increase the frequency of the test signal.
[0014] According to some embodiments of the present application, the second frequency conversion subsystem includes an oscillator, a filter and a mixer, the oscillator is used to generate an oscillation signal, the mixer is used to mix the oscillation signal with the test signal to increase the frequency of the test signal, and the filter is used to filter during the mixing process.
[0015] According to some embodiments of the present application, a power sampler is further included, one end of the power sampler is connected to the device under test, and the other end of the power sampler is connected to the spread spectrum module, the power sampler is used to detect the in-band power of the signal transmitted by the device under test.
[0016] According to some embodiments of the present application, the power sampler includes a detector and a digital sampler, the detector is used to convert the instantaneous power value of the signal transmitted by the device under test into a digital voltage signal, and the digital sampler samples the digital voltage signal to detect the in-band power of the signal transmitted by the device under test.
[0017] According to some embodiments of the present application, the signal generator includes a first signal generator and a second signal generator, the first signal generator is used to generate a first test signal, and the second signal generator is used to generate a second test signal, the first signal generator is connected to the spread spectrum module, and the second signal generator is connected to the power sampler, and the first test signal and the second test signal are transmitted through the power sampler.
[0018] According to some embodiments of the present application, the first tester is connected to the spread spectrum module, and the first tester is further used to verify the bandwidth and main sidelobe performance of the test signal after frequency increase.
[0019] According to some embodiments of the present application, the signal generator generates the test signal through direct digital synthesis.
[0020] Other features and advantages of the present application will be set forth in the description that follows, and in part will be apparent from the description, or can be learned by practice of the application. The purposes and other advantages of the present application will be realized and attained by the structure particularly pointed out in the description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS
[0021] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and are used to explain the technical solutions of the application, and do not constitute a limitation on the technical solutions of the application.
[0022] The application will be further described below in conjunction with the drawings and embodiments;
[0023] Figure 1 is a structural schematic block diagram of a WiFi7 radio frequency test device provided by an embodiment of the application;
[0024] Figure 2 is a structural schematic block diagram of a WiFi7 radio frequency test device provided by another embodiment of the application;
[0025] Figure 3 is a structural schematic block diagram of a spread spectrum module of a WiFi7 radio frequency test device provided by another embodiment of the application. DETAILED DESCRIPTION
[0026] This part will describe the specific embodiments of the application in detail, the preferred embodiments of the application are shown in the drawings, the role of the drawings is to supplement the description of the text part with figures, so that people can intuitively and visually understand each technical feature and the overall technical solution of the application, but it cannot be understood as a limitation on the protection scope of the application.
[0027] In the description of the application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.
[0028] In the description of the application, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features
[0029] In the description of the present application, the words such as setting, installing, connecting and the like should be understood in a broad sense unless otherwise explicitly defined, and the person skilled in the art can determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.
[0030] The following will be described in combination with the accompanying Figures 1-3 The present application is further described.
[0031] As Figure 1 shown, Figure 1 is a structural schematic block diagram of a WiFi7 radio frequency test device provided by an embodiment of the present application, the WiFi7 radio frequency test device comprising: a signal generator, a spread spectrum module, a first test instrument and a test monitoring device;
[0032] The signal generator is used to generate a test signal;
[0033] The spread spectrum module is connected between the signal generator and the device under test, and is used to improve the frequency of the test signal, so that the test signal received by the device under test meets the WiFi7 radio frequency test requirements;
[0034] The first test instrument is connected to the device under test, and is used to test the performance of the received signal of the device under test;
[0035] The test monitoring device is connected with the first test instrument, and is used to collect test data and analyze test results.
[0036] In the embodiment, the WiFi7 radio frequency test device can be used to test WiFi7 related terminal devices, such as wireless routers and wireless access points (APs), etc. The test device can test the strength of the wireless signal transmitted by the device, the receiving sensitivity, the performance of the device on different WiFi channels, the performance of the device in the presence of other signal interference, the data transmission rate and efficiency of the device, the performance of the device when switching between different access points, etc.
[0037] It can be understood that the test of the device under test by the WiFi7 radio frequency test device can include a receiving test, that is, the performance of the device under test in receiving a signal, for example, the performance of a WiFi7 wireless router in receiving a signal. The performance of the device under test in receiving a signal can be embodied in various aspects, such as receiving sensitivity parameters, minimum received signal strength indication, selectivity, maximum input power, bit error rate, signal-to-noise ratio, channel isolation, multiple-input multiple-output (MIMO) performance, interference suppression, frequency response, dynamic range, etc.
[0038] The test of WiFi 6 is usually focused on the 2.4 GHz and 5 GHz frequency bands, and the focus is on the receiving performance of the device in these frequency bands, including the maximum receiving power and receiving sensitivity, and the processing capability of 160 MHz bandwidth. For WiFi 7, in addition to the above frequency bands, tests also need to be conducted in the 6 GHz frequency band, including support for 320 MHz bandwidth, and the receiving performance test needs to verify whether the device can maintain good receiving sensitivity under a wider bandwidth. The performance of the device under the minimum receivable signal strength (for example, -70 dBm) under WiFi 6 is tested to ensure that the connection can still be maintained in the case of weak signals. WiFi 7 supports higher modulation orders (such as 4096-QAM), and the receiving sensitivity test needs to evaluate the performance of the device under lower signal strength to ensure that stable connection can still be maintained under higher data rates. Compared with the test of WiFi 6, since WiFi 7 devices can use multiple frequency bands and channels simultaneously, the test needs to include interference scenarios for these multi-link operations, and the receiving performance of the device in a complex interference environment. The receiving performance of the device when using 8x8 MIMO technology under WiFi 6 is tested, including the effect of spatial diversity and the phase synchronization between multiple antennas, and higher order MIMO configurations (such as 16x16 MIMO) are tested under WiFi 7.
[0039] Based on this, the first tester needs to have multiple testing capabilities, therefore, the first tester can be a network analyzer with wireless testing function, which can send and receive wireless signals for analyzing the receiving characteristics of the device under test, including frequency response, bandwidth, phase and group delay, etc. It can also be a wireless communication tester designed specifically for wireless communication devices, which can simulate a WiFi network environment and provide detailed test reports including receiving sensitivity, bit error rate and signal-to-noise ratio, etc. It can also be a spectrum analyzer, which can capture the strength and characteristics of wireless signals in the entire frequency spectrum, measure the received signal strength, check the occupation of signals in the frequency spectrum, and test the response of the device to different frequency signals and the selectivity to adjacent channel signals, etc.
[0040] In addition, since WiFi 7 technology introduces 320 MHz bandwidth, in order to realize the radio frequency test of WiFi 7 related terminal devices, the test device needs to support a larger frequency range and bandwidth. Based on this, through the spread spectrum module connected between the signal generator and the device under test, the frequency of the test signal generated by the signal generator is increased, so that the test device can cover higher frequency bands, thereby meeting the test requirements of WiFi 7 technology and realizing the radio frequency test of WiFi 7 devices.
[0041] In this embodiment, the spread spectrum module can be used to expand the output frequency range and bandwidth of the signal generator to meet the test requirements of new standards such as WiFi 7; the spread spectrum module can include an upconverter that converts baseband signals or lower frequency signals to higher frequencies, and can also include amplifiers, filters, frequency mixers, etc. for processing radio frequency signals, and can also include a wideband radio frequency amplifier for amplifying signals to ensure that the signals maintain sufficient strength within the expanded frequency range, and can also include a filter for selecting a specific frequency range to exclude unwanted frequency components.
[0042] In an embodiment, the spread spectrum module can spread the signal to 6-7.125 GHz.
[0043] In an embodiment, the first tester can be a spectrum analyzer, and spectrum analysis is the core of radio frequency testing, used to measure the frequency components of a signal. Through the spectrum analyzer, the performance of the radio frequency signal in the frequency domain can be viewed, and the bandwidth, power spectral density, and signal-to-noise ratio of the signal can be measured.
[0044] In an embodiment, the reception test of the WiFi 7 radio frequency test device can first connect the spread spectrum module to the signal generator to ensure that the signal output by the signal generator can be frequency spread and bandwidth increased by the spread spectrum module, and to confirm that the output of the spread spectrum module matches the reception frequency range and bandwidth of the WiFi 7 device under test; set the signal generator to generate the required test signal, including appropriate frequency, bandwidth, power and modulation type, and configure the spread spectrum module to match the output of the signal generator and ensure that the output signal meets the test requirements of WiFi 7; send signals to the WiFi 7 device under test through the spread spectrum module; use a spectrum analyzer or other reception performance test equipment to monitor and analyze the signals received by the device under test; evaluate the strength, quality and stability of the signals received by the device under test, and check the performance of the device under test at maximum bandwidth and different frequencies.
[0045] The signal generator is used to generate test signals, and it can be understood that the signal generator is used to generate original test signals before spreading, and the test signals can be baseband signals. The signal generator can be an arbitrary waveform generator that can generate user-defined complex waveforms such as baseband signals, modulated signals, etc.; it can also be a vector signal generator used to generate complex modulated signals such as QAM, PSK, FSK, etc., and can also simulate actual wireless communication signals including WiFi, LTE, 5G, etc.
[0046] The signal generator can generate a basic signal in the form of a digital signal without radio frequency modulation, or a signal that has been radio frequency modulated and can be directly transmitted through an antenna, including specific frequency, bandwidth and modulation type, to simulate the actual wireless communication environment; It can also be a modulated signal using various modulation techniques for testing the modulation and demodulation capabilities of wireless devices; It can also be a multi-carrier signal for simulating the multi-carrier transmission used in modern wireless communication systems, etc.
[0047] The test monitoring device is connected to the first test instrument for collecting test data and analyzing test results. The test monitoring device can be a computer or other device. It can be understood that the parameters of the monitoring device can be set according to the test plan, including frequency range, bandwidth, sampling rate, etc., to ensure that all relevant test data can be accurately captured. In the receiving test, the test monitoring device can collect data of the received signal of the device under test through the first test instrument, including signal strength, bit error rate, throughput, delay, etc. During the test, the monitoring device can provide real-time feedback to help engineers observe whether the performance of the device under test meets the expectations, and record the collected data for subsequent detailed analysis.
[0048] In an embodiment, the test monitoring device can analyze the performance of the device under test under different signal conditions, such as receiving performance under different frequencies, bandwidths and signal strengths. It can also evaluate the performance of the device under test in a multi-user scenario, such as MU-MIMO and OFDMA, etc. WiFi 7 new features. If the test results show that the performance of the device under test does not meet the standard, the monitoring device can also help diagnose the problem, such as whether it is a problem with the radio frequency front end, insufficient receiving sensitivity, or other hardware or software problems. After the test is completed, the monitoring device can generate a detailed test report, including test results, performance charts and records of any abnormal conditions.
[0049] In some embodiments of the WiFi 7 radio frequency test device provided in the present application, as shown in Figure 2 , it further comprises a second test instrument connected between the spread spectrum module and the test monitoring device for testing the performance of the signal transmitted by the device under test.
[0050] Referring to Figure 2 , Figure 2is a structural schematic block diagram of a WiFi7 radio frequency test device provided by another embodiment of the present application. It can be understood that the WiFi7 radio frequency test device can test the measured device, which can include a transmission test, that is, test the performance of the measured device transmitting signals, for example, the performance of a WiFi7 wireless router transmitting signals. The performance of the measured device transmitting signals can be embodied in various aspects, such as output power, error vector magnitude, frequency deviation, bandwidth, adjacent channel leakage ratio, occupied bandwidth, envelope tracking, quality of transmitted signals, multiple-input multiple-output (MIMO) performance, waveform quality, etc.
[0051] Based on this, the second tester also needs to have multiple testing capabilities, so the second tester can be a network analyzer with wireless testing function, a wireless communication tester, a spectrum analyzer, a comprehensive tester, etc.
[0052] The second tester is connected between the spread spectrum module and the test monitoring device, so the test monitoring device, the second tester, the spread spectrum module and the measured device are connected in sequence. The signal transmitted by the measured device is input to the second tester after passing through the spread spectrum module. The test monitoring device obtains the test result after the second tester tests the signal transmitted by the measured device.
[0053] It can be understood that the signal transmitted by the measured device is input to the second tester after passing through the spread spectrum module. In the transmission test, the channel of the signal transmitted by the measured device passing through the spread spectrum module can be different from the channel of the signal passing through the spread spectrum module in the reception test. In addition, the influence of the spread spectrum module on the signal can be relatively small, that is, the transparency of the signal needs to be maintained when processing the signal, and no additional distortion or noise is introduced. In addition, the insertion loss of the spread spectrum module can be relatively low to reduce the energy loss of the signal when passing through the module, and the linearity of the spread spectrum module can be relatively high to avoid nonlinear distortion of the signal in the spread spectrum process. In an embodiment, the spread spectrum module can convert the frequency of the signal to a frequency range that the second tester can receive.
[0054] In the WiFi7 radio frequency test device provided by some embodiments of the present application, the spread spectrum module includes a first frequency conversion subsystem, and the first frequency conversion subsystem is used to process the signal transmitted by the measured device to enable the second tester to test the performance of the signal transmitted by the measured device.
[0055] In this embodiment, the spread spectrum module includes a first frequency conversion subsystem, and the first frequency conversion subsystem is used to transmit the signal transmitted by the measured device in the transmission test and process the signal transmitted by the measured device to enable the second tester to test the performance of the signal transmitted by the measured device.
[0056] It can be understood that the processing of the signal transmitted by the device under test by the first frequency conversion subsystem can be frequency conversion processing, for example, converting the frequency of the signal from a lower frequency range to a higher frequency range or converting the frequency of the signal from a higher frequency range to a lower frequency range, because the tester usually has its inherent receiving frequency range, if the transmission signal of the device under test is not within this range, the frequency conversion subsystem must adjust the signal frequency to the range that the tester can receive, and in some cases, frequency conversion can help avoid frequency conflicts with other wireless signals or systems, and signal processing is also more convenient in some frequency ranges.
[0057] In an embodiment, the second tester can be a wireless tester of CWM270 model, which supports testing of multiple wireless communication standards, including WiFi 7 (IEEE 802.11be).
[0058] In the WiFi 7 radio frequency test device provided in some embodiments of the present application, the spread spectrum module includes a second frequency conversion subsystem, and the second frequency conversion subsystem is configured to generate an oscillation signal and mix the oscillation signal with a test signal to increase the frequency of the test signal.
[0059] In the present embodiment, the spread spectrum module includes a second frequency conversion subsystem, and the second frequency conversion subsystem is configured to increase the frequency of the test signal, specifically, the second frequency conversion subsystem increases the frequency of the test signal by generating an oscillation signal and mixing the oscillation signal with the test signal.
[0060] It can be understood that the second frequency conversion subsystem can generate a pure oscillation signal through a built-in high-stability oscillator, and the generated oscillation signal is then introduced into a mixer to mix with the test signal to be processed. The mixer multiplies two signals of different frequencies to generate new frequency components. In the mixing process, by selecting a suitable oscillation signal frequency, the mixed signal contains the sum frequency of the original test signal frequency and the oscillation signal frequency.
[0061] In the WiFi 7 radio frequency test device provided in some embodiments of the present application, as shown in Figure 3 , the second frequency conversion subsystem includes an oscillator, a filter, and a mixer. The oscillator is configured to generate an oscillation signal, the mixer is configured to mix the oscillation signal with a test signal to increase the frequency of the test signal, and the filter is configured to filter during the mixing process.
[0062] Referring to Figure 3 , Figure 3is a structural schematic block diagram of a frequency spreading module provided by another embodiment of the present application, the frequency spreading module comprising an oscillator, a filter and a mixer, in addition, comprising a power divider and a plurality of amplifiers, and a second frequency conversion subsystem comprising an oscillator, a filter and a mixer; the oscillator is used to generate an oscillation signal of 4-6 GHz, the oscillation signal generated by the oscillator enters the mixer after being distributed by the power divider and amplified by the amplifier, the test signal generated by the signal generator also enters the mixer, the test signal generated by the signal generator is an intermediate frequency signal, and the mixer is used to mix the oscillation signal and the test signal to output a radio frequency signal, so as to increase the frequency of the test signal, and the radio frequency signal output by the mixer is amplified by the amplifier and then output; in addition, the filter is arranged at both ends of the mixer, and the filter can be used to filter unnecessary signals in the test signal generated by the signal generator and unnecessary signals in the radio frequency signal output by the mixer.
[0063] In an embodiment, the test signal (intermediate frequency signal) generated by the signal generator is in the range of 1-2 GHz, and the oscillation signal generated by the second frequency conversion subsystem is 4800 MHz, so that the mixing of the oscillation signal and the test signal can achieve the required frequency of the measured device in the WiFi7 radio frequency test: 5925 MHz to 7125 MHz, and the input frequency range of the frequency spreading module is 1125 MHz to 2325 MHz.
[0064] In an embodiment, the frequency spreading module further comprises a controller for realizing functions such as frequency synthesis, gain, switching, etc.
[0065] In the WiFi7 radio frequency test device provided by some embodiments of the present application, as shown in Figure 2 the power sampler is connected to the measured device at one end and connected to the frequency spreading module at the other end, and the power sampler is used to detect the in-band power of the signal transmitted by the measured device.
[0066] In the present embodiment, the power sampler is connected between the measured device and the frequency spreading module, and the power sampler is used to detect the in-band power of the signal transmitted by the measured device in the transmission test of the measured device.
[0067] It can be understood that the radio frequency signal transmitted by the measured device can be converted into a digital signal through sampling, and the sampling rate of the power sampler determines the frequency range that can be captured, in order to detect a wider broadband signal, the power sampler can be a sampler with a relatively high sampling rate, and it is ensured that the number of points collected is sufficient, so that the complete waveform of the signal can be reconstructed.
[0068] In an embodiment, a high-speed analog-to-digital converter (ADC) can be used for signal sampling, and a digital signal processing (DSP) technology can be used for analyzing the sampled signal, and the power sampler has a sampling bandwidth of at least 320MHz and can maintain low noise and high linearity in a high-frequency environment.
[0069] In the WiFi7 radio frequency test device provided by some embodiments of the present application, the power sampler includes a detector and a digital collector, the detector is used to convert the instantaneous power value of the signal transmitted by the device under test into a digital voltage signal, and the digital collector samples the digital voltage signal to detect the in-band power of the signal transmitted by the device under test.
[0070] In the present embodiment, the power sampler converts the instantaneous power value of the radio frequency signal into a voltage signal through the detector, then samples the signal through the digital collector, and performs accumulation calculation according to the number of sampling points to obtain the total power value of the signal.
[0071] In an embodiment, the detector can accurately convert the RF input signal into a corresponding decibel scale output, the digital collector can provide 12-bit, a maximum sampling rate of 500kS / s, and a maximum of 16 analog signal acquisition channels, and the in-band power of the signal transmitted by the device under test can be calculated by the following formula:
[0072]
[0073] wherein, is the in-band power of the entire signal transmitted by the device under test, is the sampling power, n is the actual sampling point, and K is the total number of sampling points.
[0074] In an embodiment, the power sampler further includes an electronic filter, and the electronic filter of the power sampler is used to select a working signal of a specific frequency band and filter out other unnecessary frequencies.
[0075] In the WiFi7 radio frequency test device provided by some embodiments of the present application, as shown in Figure 2 , the signal generator includes a first signal generator and a second signal generator, the first signal generator is used to generate a first test signal, and the second signal generator is used to generate a second test signal, the first signal generator is connected to the spread spectrum module, the second signal generator is connected to the power sampler, and the first test signal and the second test signal are transmitted through the power sampler.
[0076] In the embodiment, the signal generator comprises a first signal generator and a second signal generator, wherein the first signal generator and the second signal generator are respectively used to generate different test signals to realize different tests, the first signal generator is used to generate a first test signal, and the second signal generator is used to generate a second test signal; for example, the first signal generator is a vector signal generator, and the second signal generator is a conventional signal generator; the first signal generator is used to generate a signal with a complex modulation format, and the second signal generator is used to generate a CW continuous wave; the CW continuous wave is a simple form of electromagnetic wave with a constant amplitude and frequency and does not carry any modulation information; in radio communication, the continuous wave can be regarded as a single frequency signal without an envelope varying with time.
[0077] In radio frequency testing, the CW continuous wave can be used to test the linear response and basic performance of a device, and the signal generated by the vector signal generator can be used to test the performance of the device under a complex modulation signal; for example, using the CW continuous wave as a reference signal, a performance reference point can be established, and then a complex signal generated by the vector signal generator is used for testing, and the performance difference of the device in processing simple and complex signals can be compared; in some cases, the CW continuous wave can be used for system calibration to ensure the accuracy and consistency of the test system, and then a complex signal generated by the vector signal generator is used for actual performance testing; in this way, by combining the first test signal and the second test signal, the performance of the device under test can be more comprehensively evaluated, including its stability, linearity, dynamic range and the like under different signal conditions.
[0078] In addition, the first test signal and the second test signal are transmitted to the device under test through the power sampler, that is, the power sampler can simultaneously receive the first test signal and the second test signal and transmit them to the device under test.
[0079] In an embodiment, the first tester is connected to the spread spectrum module through a radio frequency line, the second tester is connected to the power sampler through a radio frequency line, the first signal generator is connected to the spread spectrum module through a radio frequency line, the second signal generator is connected to the power sampler through a radio frequency line, and the spread spectrum module and the power sampler are communicatively connected;
[0080] In addition, the power sampler can be connected to the test monitoring device through a USB to transmit the power detection result; the first tester, the second tester, the first signal generator and the second signal generator are all connected to the test monitoring device through a network switch; and the spread spectrum module and the power sampler are further connected to the test monitoring device through a GPIB (General Purpose Interface Bus) card.
[0081] In an embodiment, the first tester is connected to the first signal generator through a trigger line, and the first signal generator can be controlled by the first tester to generate the first test signal through the trigger line.
[0082] In the WiFi7 radio frequency test device provided in some embodiments of the present application, as shown in Figure 2 The first tester is connected to the spread spectrum module, and the first tester is also used to verify the bandwidth and main sidelobe performance of the test signal with the increased frequency.
[0083] It can be understood that the first tester is connected to the device under test to test the performance of the received signal of the device under test, and the first tester can also be connected to the spread spectrum module. After the spread spectrum module increases the frequency of the test signal, the test signal with the increased frequency is transmitted to the first tester, and the bandwidth and main sidelobe performance of the test signal with the increased frequency are verified by the first tester.
[0084] In the WiFi7 radio frequency test device provided in some embodiments of the present application, the signal generator generates the test signal through a direct digital synthesis method.
[0085] It can be understood that the first signal generator can generate the first test signal (baseband signal) by using a DDS (Direct Digital Synthesis) technology. By flexibly programming and controlling the first signal generator, signals with different frequencies and amplitudes can be outputted. For example, a precise sine wave or a modulated signal can be generated by using the DDS technology. The frequency of the output signal can be flexibly adjusted by controlling the step value of the phase accumulator. A high-resolution DAC (Digital-to-Analog Converter) is used to convert the digital signal into an analog signal, so as to ensure low phase noise and high signal purity. The first signal generator supports multiple modes such as CW signal, AM, FM, and digital modulation (BPSK, QPSK), and a user can dynamically adjust the frequency, amplitude, and modulation mode of the output signal through an external interface.
[0086] The first signal generator can realize the phase accumulation and waveform storage of the DDS through an FPGA;
[0087] A high-fidelity analog signal is outputted through a high-speed DAC (with a resolution of 16 bits or higher);
[0088] A pseudo-random sequence is generated through a linear feedback shift register (Linear Feedback Shift Register, LFSR). The linear feedback shift register has a long period and good autocorrelation, and can support different code rates to generate a pseudo-random code (PN code). The linear feedback shift register supports output with different code rates (such as 1 Mbps and 10 Mbps), realizes rate adjustment through clock division, and supports dynamic change of the pseudo-random code seed to enhance signal security.
[0089] Linear feedback shift register can use FPGA to implement shift register and feedback logic, and cooperate with high-speed clock (such as 100 MHz) to provide high code rate output.
[0090] Design parameter example of linear feedback shift register:
[0091] Shift register length NNN: determines the code period T = 2N−1T = 2^N - 1T=2N−1;
[0092] Feedback polynomial: select the feedback polynomial of maximum length sequence (m sequence) to optimize the autocorrelation performance.
[0093] In an embodiment, the first signal generator can implement bit-by-bit multiplication of the baseband signal and the pseudo-random code through a modulator to realize direct sequence spread spectrum, and the modulation formats supported by the first signal generator include BPSK, QPSK, etc. For example, through BPSK modulation, the baseband signal and the PN code are multiplied bit by bit to generate a spread spectrum digital signal, and the digital signal is converted into an analog signal through a low-pass filter; through QPSK modulation, it can be processed in parallel through I / Q signal path.
[0094] The first signal generator can implement point-by-point multiplication of the baseband signal and the PN code through a high-speed multiplier, and then perform anti-aliasing filtering on the modulated signal through a filter. The high-speed multiplier can include an embedded DSP module in the FPGA, the FPGA is responsible for digital multiplication and filtering, and the DSP module is used for dynamic adjustment of the signal path (such as gain control). The filter can use a FIR or IIR filter.
[0095] The first signal generator can use a wideband high-linearity amplifier to cover the DC to 20 GHz frequency band, ensuring the amplitude stability and signal quality of the spread spectrum signal; the first signal generator can include a wideband low-noise amplifier for implementing primary amplification of the input signal, covering DC to 20 GHz; a power amplifier for providing high output power, using GaN or LDMOS technology to meet high frequency band requirements; an adjustable gain amplifier for realizing dynamic gain adjustment and supporting user configuration; an automatic gain control module for real-time monitoring of output power feedback and dynamically adjusting the gain to ensure output stability; the first signal generator can also use feedforward or pre-distortion (Pre-Distortion) technology to reduce nonlinear distortion; and ensure that the output signal has good error vector magnitude performance.
[0096] The first signal generator can ensure strict alignment of the pseudo-random code and the baseband signal in the time domain through a high-precision clock distribution network; the first signal generator can use a high-stability OCXO (oven-controlled crystal oscillator) to provide a clock reference, with a frequency accuracy better than ±0.1 ppm, and use a clock division network to achieve the multiple-frequency clock requirements within the system; frequency phase locking of multiple devices is achieved through an external reference signal (such as a 10 MHz GPS reference signal), and synchronous starting of multiple spreaders is achieved through a synchronous trigger interface (such as Trigger In / Out); in addition, clock jitter can be suppressed at high frequencies through a low-phase-noise PLL (phase-locked loop), and clock delay is compensated for to maintain synchronization when long-distance transmission is used.
[0097] The above describes the embodiments of the application in detail in combination with the drawings, but the application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the application.
Claims
1. A WiFi7 radio frequency test device, characterized in that, The application relates to a signal generator for generating a test signal, a spread spectrum module connected between the signal generator and a device under test for increasing the frequency of the test signal so that the test signal received by the device under test meets the WiFi7 radio frequency test requirements, a first tester connected to the device under test for testing the performance of the received signal of the device under test, and a test monitoring device connected to the first tester for collecting test data and analyzing test results. The application further comprises a second tester connected between the spread spectrum module and the test monitoring device for testing the performance of the transmitted signal of the device under test. The spread spectrum module comprises a first frequency conversion subsystem for processing the transmitted signal of the device under test so that the second tester tests the performance of the transmitted signal of the device under test. The spread spectrum module comprises a second frequency conversion subsystem for generating an oscillation signal and mixing the oscillation signal with the test signal to increase the frequency of the test signal. The second frequency conversion subsystem comprises an oscillator for generating an oscillation signal, a mixer for mixing the oscillation signal with the test signal to increase the frequency of the test signal, and a filter for filtering during the mixing process.
2. The WiFi7 radio frequency test device of claim 1, wherein, The application further comprises a power sampler connected at one end to the device under test and at the other end to the spread spectrum module, the power sampler being used to detect the in-band power of the transmitted signal of the device under test.
3. The WiFi7 radio frequency test device of claim 2, wherein, The power sampler comprises a detector for converting the instantaneous power value of the transmitted signal of the device under test into a digital voltage signal and a digital collector for sampling the digital voltage signal to detect the in-band power of the transmitted signal of the device under test.
4. The WiFi7 radio frequency test device of claim 1, wherein, The signal generator comprises a first signal generator for generating a first test signal and a second signal generator for generating a second test signal, the first signal generator being connected to the spread spectrum module and the second signal generator being connected to the power sampler, the first test signal and the second test signal being transmitted through the power sampler.
5. The WiFi7 radio frequency test apparatus of claim 4, wherein, The first tester is connected to the spread spectrum module, and the first tester is further used to verify the bandwidth and main sidelobe performance of the test signal after the frequency is increased.
6. The WiFi7 radio frequency test apparatus of claim 1, wherein, The signal generator generates the test signal by a direct digital synthesis method.
7. The WiFi 7 radio frequency test apparatus of claim 6, wherein, 8. The WiFi7 radio frequency test apparatus of claim 6, wherein, 9. The WiFi7 radio frequency test device of claim 1, wherein, 10. The WiFi7 radio frequency test apparatus of claim 1, wherein,