Method and system for detecting influence of radio frequency subsystem on receiver sensitivity
By obtaining the minimum signal-to-noise ratio and target EVM value of the output signal of the RF subsystem, and combining the configuration of the signal source, the RF subsystem to be measured and the signal analyzer, the difference between the current EVM value and the target EVM value is compared, which solves the problem of traditional methods that ignore non-ideal characteristics, resulting in low detection accuracy, and realizes a more accurate detection of the impact of the RF subsystem performance on receiver sensitivity.
Patent Information
- Application Number
- CN202311730886.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-15
- Publication Date
- 2025-06-17
AI Technical Summary
Traditional receiver sensitivity evaluation methods ignore the impact of other non-ideal characteristics in the RF subsystem on receiver sensitivity, making it difficult to accurately detect the impact of RF subsystem performance on receiver sensitivity.
By obtaining the minimum signal-to-noise ratio of the output signal of the radio frequency subsystem to be measured, the target EVM value is converted, the signal source, the radio frequency subsystem to be measured and the signal analyzer to the target working mode, and by comparing the difference between the current EVM value and the target EVM value, the RF signal power transmitted by the signal source is recorded as the sensitivity of the radio frequency subsystem to be measured to the receiver.
This method can more fully evaluate the sensitivity effect of the RF subsystem on the overall system receiver, improve the detection accuracy of the impact of the RF subsystem performance on the receiver sensitivity, and thus facilitate the evaluation, design and improvement of the RF subsystem performance.
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Figure CN120165790A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of communication technologies, and in particular, to a method and system for detecting the influence of a radio frequency subsystem on the sensitivity of a receiver. Background Art
[0002] Currently, the sensitivity of a wireless communication system receiver (hereinafter referred to as a receiver) can be defined as the minimum radio frequency signal power that can meet the system - required error rate (also known as bit error rate, frame error rate, packet error rate, etc.). Sensitivity is an important indicator for measuring the performance of a receiver. Receivers can be divided into three major modules according to their functions and working modes: a radio frequency subsystem, a digital signal demodulator, and an analog - to - digital converter connecting the two. During the development and verification of a receiver, since sensitivity is directly related to the performance of the radio frequency subsystem in the receiver, it is necessary to study the influence of the radio frequency subsystem on the receiver sensitivity at each stage.
[0003] Traditional receiver sensitivity evaluation methods include that developers of digital demodulators give the minimum signal - to - noise ratio that the output signal of the radio frequency subsystem needs to meet through simulation and other means, testers measure the noise figure of the radio frequency subsystem from the antenna port to the input end of the analog - to - digital converter in the radio frequency subsystem, designers calculate the integrated thermal noise power within the noise frequency band of the radio frequency subsystem according to the working mode and configuration of the receiver, and then deduce the sensitivity of the corresponding receiver by synthesizing the above data, that is: the sensitivity of the receiver is approximately equal to the minimum signal - to - noise ratio that the output signal of the radio frequency subsystem needs to meet plus the noise figure of the radio frequency subsystem, plus the integrated thermal noise power within the noise bandwidth of the radio frequency subsystem. This method mainly focuses on the influence of the noise within the radio frequency subsystem on the receiver sensitivity, while ignoring the distortion phenomena caused by other non - ideal characteristics in the radio frequency subsystem, such as in - phase and quadrature signal imbalance, group delay within the filter passband, and phase noise of the voltage - controlled oscillator.
[0004] In view of the above - mentioned related technologies, the inventors found that the traditional receiver sensitivity evaluation method has the problem that it is difficult to accurately detect the influence of the performance of the radio frequency subsystem on the receiver sensitivity because it ignores the influence of other non - ideal characteristics in the radio frequency subsystem on the receiver sensitivity. Summary of the Invention
[0005] In order to improve the detection accuracy of the influence of the performance of the radio frequency subsystem on the receiver sensitivity, the present application provides a method and system for detecting the influence of a radio frequency subsystem on the receiver sensitivity.
[0006] In a first aspect, the present application provides a method for detecting the influence of a radio frequency subsystem on the receiver sensitivity.
[0007] The present application is achieved through the following technical solutions:
[0008] A detection method for the influence of a radio frequency subsystem on the receiver sensitivity, comprising the following steps,
[0009] Based on the target operating mode of the radio frequency subsystem to be tested, obtain the lowest signal-to-noise ratio of the output signal of the radio frequency subsystem to be tested, and convert the target EVM value according to the lowest signal-to-noise ratio;
[0010] Based on the target EVM value, configure the signal source device, the radio frequency subsystem to be tested, and the signal analyzer to the target operating mode;
[0011] When the signal source device generates a modulated radio frequency signal with the same characteristics as the received signal during the operation of the radio frequency subsystem to be tested, input the modulated radio frequency signal into the signal analyzer through the radio frequency subsystem to be tested, and output the current EVM value;
[0012] Compare the current EVM value with the target EVM value;
[0013] If the difference between the current EVM value and the target EVM value meets the preset threshold, record the radio frequency signal power transmitted by the signal source device at this time as the sensitivity of the radio frequency subsystem to be tested to the overall receiver under the current operating mode.
[0014] In a preferred example of the present application, it can be further configured as: further comprising the following steps,
[0015] If the current EVM value is greater than the target EVM value, increase the radio frequency signal power of the signal source device until the difference between the current EVM value and the target EVM value meets the preset threshold.
[0016] In a preferred example of the present application, it can be further configured as: further comprising the following steps,
[0017] If the current EVM value is less than the target EVM value, decrease the radio frequency signal power of the signal source device until the difference between the current EVM value and the target EVM value meets the preset threshold.
[0018] In a preferred example of the present application, it can be further configured as: when increasing or decreasing the radio frequency signal power of the signal source device, it includes the following steps,
[0019] When adjusting the radio frequency signal power of the signal source device, the step size is in units of 0.5 dB.
[0020] In a preferred example of the present application, it can be further configured as: the step of converting the target EVM value according to the lowest signal-to-noise ratio includes,
[0021] Based on EVM max =-SNR min, calculate the target EVM value, where EVM max is the target EVM value, and SNR min is the minimum signal-to-noise ratio of the output signal of the RF subsystem to be measured under a specific operating mode.
[0022] In a second aspect, the present application provides a detection system for the influence of an RF subsystem on the receiver sensitivity.
[0023] The present application is achieved through the following technical solutions:
[0024] A detection system for the influence of an RF subsystem on the receiver sensitivity, which is applied to the detection method for the influence of an RF subsystem on the receiver sensitivity as described above, includes
[0025] A signal source device, configured to generate a modulated RF signal under a specific operating mode;
[0026] An RF subsystem to be measured, configured to receive the modulated RF signal generated by the signal source device;
[0027] A signal analyzer, configured to receive the in-phase signal and the quadrature signal generated by the RF subsystem to be measured and output the current EVM value.
[0028] In a preferred example, the present application can be further configured as: the RF subsystem to be measured includes an RF subsystem, an analog-to-digital converter, and a digital signal demodulator;
[0029] The output end of the RF subsystem is electrically connected to the input end of the analog-to-digital converter;
[0030] The output end of the analog-to-digital converter is electrically connected to the input end of the digital signal demodulator.
[0031] In a preferred example, the present application can be further configured as: the signal analyzer uses a signal analyzer with a WiFi measurement option and an analog in-phase signal and quadrature signal measurement option.
[0032] In a third aspect, the present application provides a computer device.
[0033] The present application is achieved through the following technical solutions:
[0034] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of any of the above detection methods for the influence of an RF subsystem on the receiver sensitivity are implemented.
[0035] In a fourth aspect, the present application provides a computer-readable storage medium.
[0036] The present application is achieved through the following technical solutions:
[0037] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, it implements the steps of the method for detecting the influence of any of the above radio frequency subsystems on the receiver sensitivity.
[0038] In summary, compared with the prior art, the beneficial effects brought by the technical solution provided by this application at least include:
[0039] Based on the target operating mode of the radio frequency subsystem to be measured, obtain the lowest signal-to-noise ratio of the output signal of the radio frequency subsystem to be measured, and convert the target EVM value according to the lowest signal-to-noise ratio, so as to evaluate the sensitivity of the radio frequency subsystem by means of the error vector magnitude, which can reflect more characteristics such as the noise and signal distortion of the receiver link, and then measure the influence of other non-ideal characteristics in the radio frequency subsystem on the receiver sensitivity; based on the target EVM value, configure the signal source, the radio frequency subsystem to be measured, and the signal analyzer to the target operating mode to prepare for detecting the influence of the radio frequency subsystem on the receiver sensitivity; when the signal source generates a modulated radio frequency signal with the same characteristics as the received signal when the radio frequency subsystem to be measured is operating, input the modulated radio frequency signal into the signal analyzer through the radio frequency subsystem to be measured, and output the current EVM value to reflect the current sensitivity of the radio frequency subsystem; compare the current EVM value with the target EVM value, if the difference between the current EVM value and the target EVM value meets the preset threshold, record the radio frequency signal power emitted by the signal source at this time as the sensitivity of the receiver where the radio frequency subsystem to be measured is located under the current operating mode, and judge whether the radio frequency signal power emitted by the signal source at this time can make the sensitivity of the radio frequency subsystem to the overall wireless communication system receiver reach the preset accuracy requirement through the comparison result of the current EVM value and the target EVM value, and then predict the best sensitivity of the overall system receiver, which can more comprehensively evaluate the influence of the radio frequency subsystem on the sensitivity of the overall system receiver, improve the detection accuracy of the influence of the radio frequency subsystem performance on the receiver sensitivity, and ultimately facilitate the evaluation, design, and improvement of the radio frequency subsystem performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0040] Figure 1 It is a schematic flowchart of a method for detecting the influence of a radio frequency subsystem on the receiver sensitivity provided by an exemplary embodiment of this application.
[0041] Figure 2 It is a structural block diagram of a system for detecting the influence of a radio frequency subsystem on the receiver sensitivity provided by another exemplary embodiment of this application.
[0042] Figure 3 It is a schematic diagram of the main internal structure of the radio frequency subsystem to be measured in a system for detecting the influence of a radio frequency subsystem on the receiver sensitivity provided by another exemplary embodiment of this application. Detailed implementation manners
[0043] This specific embodiment is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.
[0044] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.
[0045] In addition, the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. These three situations. In addition, the character " / " in this article, unless otherwise specified, generally represents an "or" relationship between the associated objects before and after.
[0046] In the traditional method for detecting the influence of a radio frequency subsystem on the receiver sensitivity, within the bandwidth required by the corresponding operating mode of the radio frequency subsystem, its noise figure is measured, and based on the bandwidth, noise figure, and the minimum signal-to-noise ratio that the output signal of the radio frequency subsystem needs to meet, the sensitivity of the corresponding receiver is estimated. The specific calculation formula is as follows: P min = SNR min + NF + P N , where P N is the integrated thermal noise power within the receiver noise bandwidth in the radio frequency subsystem, NF is the noise figure from the antenna port to the input end of the analog-to-digital converter in the radio frequency subsystem, SNR min is the minimum signal-to-noise ratio that the output signal of the radio frequency subsystem needs to meet in the current operating mode, and P min is the sensitivity of the receiver deduced in this operating mode. However, this method mainly focuses on the influence of the noise within the radio frequency subsystem on the receiver sensitivity, while ignoring other non-ideal characteristics in the radio frequency subsystem, such as the imbalance between in-phase signals and quadrature signals, the group delay within the filter passband, and the phase noise of the voltage-controlled oscillator. These non-ideal characteristics cause distortion of the system output signal, resulting in difficulty in accurately detecting the influence of the radio frequency subsystem performance on the receiver sensitivity, and the detection accuracy of the influence of the radio frequency subsystem performance on the receiver sensitivity is relatively low.
[0047] In order to improve the detection accuracy of the impact of the radio frequency subsystem performance on the receiver sensitivity, this application uses the Error Vector Magnitude (EVM) to evaluate the impact of the radio frequency subsystem performance on the sensitivity of the overall receiver. While considering the noise figure of the radio frequency subsystem, other non-ideal characteristics of the radio frequency subsystem are also considered to comprehensively measure the impact of the radio frequency subsystem performance on the receiver sensitivity. And based on the comparison result between the current EVM value and the target EVM value, it is determined whether the radio frequency signal power emitted by the signal source at this time can make the radio frequency subsystem achieve the preset accuracy requirement for the sensitivity of the overall wireless communication system receiver, thereby predicting the optimal sensitivity of the overall system receiver, being able to more comprehensively evaluate the impact of the radio frequency subsystem on the sensitivity of the overall system receiver, improving the detection accuracy of the impact of the radio frequency subsystem performance on the receiver sensitivity, and ultimately being beneficial to the evaluation, design, and improvement of the radio frequency subsystem performance.
[0048] The embodiments of the present application will be further described in detail below with reference to the accompanying drawings of the specification.
[0049] Refer to Figure 1 , the embodiments of the present application provide a method for detecting the impact of a radio frequency subsystem on the receiver sensitivity, and the main steps of the method are described as follows.
[0050] Based on the target operating mode of the radio frequency subsystem to be tested, obtain the lowest signal-to-noise ratio of the output signal of the radio frequency subsystem to be tested, and convert the target EVM value according to the lowest signal-to-noise ratio;
[0051] Based on the target EVM value, configure the signal source device, the radio frequency subsystem to be tested, and the signal analyzer to the target operating mode;
[0052] When the signal source device generates a modulated radio frequency signal with the same characteristics as the received signal when the radio frequency subsystem to be tested operates, input the modulated radio frequency signal into the signal analyzer through the radio frequency subsystem to be tested, and output the current EVM value;
[0053] Compare the current EVM value with the target EVM value;
[0054] If the difference between the current EVM value and the target EVM value meets the preset threshold, record the radio frequency signal power emitted by the signal source device at this time as the sensitivity of the radio frequency subsystem to be tested to the overall receiver under the current operating mode.
[0055] Specifically, build a test environment, including a signal source device for generating a signal source SG, a radio frequency subsystem to be tested (DUT), and a signal analyzer (SA). The signal source device can generate a modulated radio frequency signal with the same characteristics as the received signal when the radio frequency subsystem to be tested operates.
[0056] Set the target operating mode of the RF subsystem under test to obtain the lowest signal-to-noise ratio of the output signal of the RF subsystem under test. According to the lowest signal-to-noise ratio, convert to obtain the target EVM value, including,
[0057] Based on EVM max =-SNR min , calculate the target EVM value, where EVM max is the target EVM value, and SNR min is the lowest signal-to-noise ratio of the output signal of the RF subsystem under test in a specific operating mode.
[0058] In this embodiment, to obtain the lowest signal-to-noise ratio SNR min that the output signal of the RF subsystem needs to meet in a specific operating mode of the system, it is obtained by the digital signal demodulator designer through simulating the digital signal demodulator for the corresponding SNR min in a specific operating mode.
[0059] For the known lowest signal-to-noise ratio of the output signal of the RF subsystem under test that can achieve the required error rate of the receiver system in the target operating mode of the RF subsystem under test, convert it to the corresponding target EVM value through the above formula. This target EVM value is the highest EVM value of the output signal of the RF subsystem under test that is allowed to achieve the required error rate of the receiver system in the current operating mode of the RF subsystem under test.
[0060] The EVM value not only reflects the influence of the noise in the RF subsystem on the signal quality, but also reflects the distortion of the signal caused by other non-ideal characteristics.
[0061] Based on the target EVM value, configure the signal source device, the RF subsystem under test, and the signal analyzer to the target operating mode.
[0062] When the signal source device generates a modulated RF signal with the same characteristics as the received signal when the RF subsystem under test is operating, input the modulated RF signal into the signal analyzer through the RF subsystem under test, and output the current EVM value.
[0063] Compare the target EVM value and the current EVM value.
[0064] If the difference between the current EVM value and the target EVM value meets the preset threshold, that is, the current EVM value is approximately equal to the target EVM value, record the RF signal power P emitted by the signal source device at this time as the sensitivity of the RF subsystem under test to the overall receiver in the current operating mode, and record the current EVM value of the signal analyzer. The lowest input signal power of the RF subsystem that can meet the EVM max requirement of the output signal is the sensitivity of the receiver.
[0065] In one embodiment, the following steps are further included.
[0066] If the current EVM value is greater than the target EVM value, increase the RF signal power of the signal source device until the difference between the current EVM value and the target EVM value meets a preset threshold.
[0067] When the current EVM value is greater than the target EVM value, that is, when the input signal power is less than the sensitivity of the receiver where the RF subsystem under test is located in the current operating mode, it is necessary to increase the RF signal power emitted by the signal source device, and reconfigure the signal source device, the RF subsystem under test, and the signal analyzer to the target operating mode.
[0068] When the signal source device generates a modulated RF signal with the same characteristics as the received signal when the RF subsystem under test is operating, input the modulated RF signal into the signal analyzer through the RF subsystem under test again, output the current EVM value, and compare the current EVM value with the target EVM value until the difference between the current EVM value and the target EVM value meets a preset threshold.
[0069] In one embodiment, the following steps are further included.
[0070] If the current EVM value is less than the target EVM value, decrease the RF signal power of the signal source device until the difference between the current EVM value and the target EVM value meets a preset threshold.
[0071] When the current EVM value is less than the target EVM value, that is, when the input signal power is greater than the sensitivity of the receiver where the RF subsystem under test is located in the current operating mode, it is necessary to decrease the RF signal power emitted by the signal source device, and reconfigure the signal source device, the RF subsystem under test, and the signal analyzer to the target operating mode.
[0072] When the signal source device generates a modulated RF signal with the same characteristics as the received signal when the RF subsystem under test is operating, input the modulated RF signal into the signal analyzer through the RF subsystem under test again, output the current EVM value, and compare the current EVM value with the target EVM value until the difference between the current EVM value and the target EVM value meets a preset threshold.
[0073] In one embodiment, when increasing or decreasing the RF signal power of the signal source device, the following steps are included.
[0074] When adjusting the RF signal power of the signal source device, the step size is in units of 0.5 dB to ensure measurement accuracy and speed.
[0075] It should be understood that the sequence numbers of the steps in the above embodiments do not indicate the order of execution. The order of execution of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
[0076] Referring to Figure 2 , the embodiments of the present application also provide a detection system for the influence of a radio frequency subsystem on the receiver sensitivity. This detection system for the influence of a radio frequency subsystem on the receiver sensitivity is used for the detection method for the influence of a radio frequency subsystem on the receiver sensitivity in the above embodiments. This detection system for the influence of a radio frequency subsystem on the receiver sensitivity includes
[0077] A signal source device for generating a modulated radio frequency signal in a specific operating mode;
[0078] A radio frequency subsystem to be measured for receiving the modulated radio frequency signal generated by the signal source device;
[0079] A signal analyzer for receiving the in-phase signal and quadrature signal generated by the radio frequency subsystem to be measured and outputting the current EVM value.
[0080] Referring to Figure 3 , in one embodiment, the radio frequency subsystem to be measured includes a radio frequency subsystem, an analog-to-digital converter, and a digital signal demodulator;
[0081] The output end of the radio frequency subsystem is electrically connected to the input end of the analog-to-digital converter;
[0082] The output end of the analog-to-digital converter is electrically connected to the input end of the digital signal demodulator.
[0083] In one embodiment, the signal analyzer uses a signal analyzer with WiFi measurement options and analog in-phase signal and quadrature signal measurement options.
[0084] Specifically, the signal source device transmits a modulated radio frequency signal to the radio frequency subsystem to be measured. The main characteristics of this measurement signal are the same as those of the signal received by the radio frequency subsystem during the normal operation of the receiver, and its characteristics include but are not limited to indicators such as frequency, power, modulation mode, data rate, etc.
[0085] The radio frequency subsystem to be measured is a system of a WiFi receiver that supports the 2.4 GHz frequency band. The signal received by the radio frequency subsystem to be measured during operation is a WiFi signal, which is described in detail as follows:
[0086] The WiFi system complies with the IEEE802.11 standard (hereinafter referred to as the standard) and supports operating modes with different bandwidths, modulation modes, and rates. There are many operating modes supported by the standard, which are not fully listed here. Only some of these operating modes are taken as examples for illustration. For these specific operating modes, the receiver sensitivity can be defined as the minimum input signal power allowed on the premise that the packet error rate of the received signal is less than 10%. The requirements for the sensitivity indicators of some WiFi standards are shown in Table 1 below.
[0087] Table 1
[0088] Standard Rate Encoding Bandwidth (MHz) Sensitivity (dBm) 802.11a / g 54Mbps BCC 20 -65 802.11n MCS 7 BCC 20 -64 802.11n MCS 7 LDPC 20 -64 802.11ax MCS 9 BCC 20 -57 802.11ax MCS 9 LDPC 20 -57 802.11n MCS 7 BCC 40 -61 802.11n MCS 7 LDPC 40 -61 802.11ax MCS 9 LDPC 40 -54
[0089] The modulated radio frequency signal is used as the signal source. The signal source used in this embodiment is a vector radio frequency signal source that supports the WiFi standard, which can generate modulated radio frequency signals in the operating modes listed in Table 1.
[0090] After the modulated radio frequency signal emitted by the signal source device is output by the radio frequency subsystem, it is input to the input end of the analog-to-digital converter. The output signal of the analog-to-digital converter usually exists in the form of a low intermediate frequency signal and is output after being demodulated by the digital signal demodulator. The signal output by the radio frequency subsystem to be measured is an in-phase and quadrature (I / Q) intermediate frequency modulated signal. This application focuses on evaluating the impact of the performance of the radio frequency subsystem on the receiving sensitivity of the overall receiver. By detecting the impact of the performance of the radio frequency subsystem on the receiving sensitivity of the overall receiver, the receiving sensitivities of the radio frequency subsystem and the digital signal demodulator are mainly detected. Compared with the traditional method of separately detecting the sensitivities of the two major modules of the radio frequency subsystem and the digital signal demodulator, the detection efficiency is higher. At the same time, the detection parameters of this application include the noise figure and other non-ideal factors, which can more comprehensively detect the receiving sensitivity of the overall receiver, improve the detection accuracy, and the applicability of the detection method is stronger.
[0091] The signal analyzer can measure the output signal of the radio frequency subsystem to be measured to obtain the EVM value in the current mode.
[0092] In one embodiment, a signal analyzer with WiFi measurement options and analog in-phase signal and quadrature signal measurement options is used to measure the in-phase signal and quadrature signal of the output signal of the radio frequency subsystem to be measured, and its error vector magnitude (EVM) value is used to measure the quality or signal-to-noise ratio of the system output signal, and the operation is simple and fast.
[0093] For other operating modes supported by the RF subsystem under test, when the operating mode of the RF subsystem under test changes, it is determined that the state of the device under test (DUT) needs to be adjusted to continue the test. At this time, switch the RF subsystem under test to the target operating mode, configure the signal source device and the RF subsystem under test again for testing, record the corresponding input modulation signal power P and the current EVM value of the signal analyzer, compare the target EVM value with the current EVM value. If the difference between the current EVM value and the target EVM value meets the preset threshold, record the RF signal power emitted by the signal source device at this time as the sensitivity of the RF subsystem under test to the overall receiver in the current operating mode, and then obtain the sensitivities corresponding to the overall receiver under different target operating modes.
[0094] The minimum signal-to-noise ratio (SNR) of the output signal of the RF subsystem in each operating mode min and the corresponding EVM max values are shown in Table 2 below.
[0095] Table 2
[0096] Standard Rate Encoding Bandwidth (MHz) <![CDATA[SNR min (dB)]]> <![CDATA[EVM max (dB)]]> 11a / g 54Mbps BCC 20 19 -19 11n MCS 7 BCC 20 21.5 -21.5 11n MCS 7 LDPC 20 20 -20 11ax MCS 9 BCC 20 27 -27 11ax MCS 9 LDPC 20 25.5 -25.5 11n MCS 7 BCC 40 21.5 -21.5 11n MCS 7 LDPC 40 20 -20 11ax MCS 9 LDPC 40 25.5 -25.5
[0097] Furthermore, according to each operating mode and the corresponding target EVM values listed in Table 2, in each operating mode, the estimated sensitivities and evaluation result summaries of the overall receiver system are shown in Table 3.
[0098] Table 3
[0099] Standard Rate Encoding Bandwidth (MHz) Estimated Sensitivity (dBm) Standard Sensitivity (dBm) 11a / g 54Mbps BCC 20 -76.5 -65 11n MCS 7 BCC 20 -71.5 -64 11n MCS 7 LDPC 20 -73.5 -64 11ax MCS 9 BCC 20 -66.5 -57 11ax MCS 9 LDPC 20 -67.5 -57 11n MCS 7 BCC 40 -68.5 -61 11n MCS 7 LDPC 40 -70.5 -61 11ax MCS 9 LDPC 40 -65.5 -54
[0100] For the specific limitations of a detection system for the impact of an RF subsystem on receiver sensitivity, reference can be made to the limitations of the detection method for the impact of an RF subsystem on receiver sensitivity in the above text, which will not be elaborated here.
[0101] Each module in the above detection system for the impact of an RF subsystem on receiver sensitivity can be implemented in whole or in part by software, hardware, and their combinations. The above modules can be embedded in the processor of a computer device in hardware form or be independent of it, or be stored in the memory of a computer device in software form, so as to facilitate the processor to call and execute the operations corresponding to each of the above modules.
[0102] In one embodiment, a computer device is provided, and the computer device may be a server. The computer device includes a processor, a memory, a network interface, and a database connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, it implements the detection method for the influence of any of the above radio frequency subsystems on the receiver sensitivity.
[0103] In one embodiment, a computer-readable storage medium is provided, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, it implements the detection method for the influence of any of the above radio frequency subsystems on the receiver sensitivity.
[0104] This application can be widely applied to a variety of wireless communication systems.
[0105] In summary, based on the target operating mode of the radio frequency subsystem to be measured, this application obtains the lowest signal-to-noise ratio of the output signal of the radio frequency subsystem to be measured, and converts the target EVM value according to the lowest signal-to-noise ratio, so as to evaluate the sensitivity of the radio frequency subsystem by means of the error vector magnitude, which can reflect more characteristics such as the noise and signal distortion of the receiver link, and further measure the influence of other non-ideal characteristics in the radio frequency subsystem on the receiver sensitivity; based on the target EVM value, configure the signal source, the radio frequency subsystem to be measured, and the signal analyzer to the target operating mode to prepare for detecting the influence of the radio frequency subsystem on the receiver sensitivity; when the signal source generates a modulated radio frequency signal with the same characteristics as the received signal when the radio frequency subsystem to be measured is working, input the modulated radio frequency signal into the signal analyzer through the radio frequency subsystem to be measured, and output the current EVM value to reflect the current sensitivity of the radio frequency subsystem; compare the current EVM value with the target EVM value. If the difference between the current EVM value and the target EVM value meets the preset threshold, record the radio frequency signal power emitted by the signal source at this time as the sensitivity of the receiver where the radio frequency subsystem to be measured is located in the current operating mode. Through the comparison result of the current EVM value and the target EVM value, judge whether the radio frequency signal power emitted by the signal source at this time can make the sensitivity of the radio frequency subsystem to the receiver of the overall wireless communication system reach the preset accuracy requirement, and then predict the best sensitivity of the receiver of the overall system, which can more comprehensively evaluate the influence of the radio frequency subsystem on the sensitivity of the receiver of the overall system, improve the detection accuracy of the influence of the performance of the radio frequency subsystem on the receiver sensitivity, and ultimately facilitate the evaluation, design, and improvement of the performance of the radio frequency subsystem.
[0106] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present application. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the various embodiments provided by the present application can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.
[0107] Those skilled in the art can clearly understand that for the convenience and brevity of description, only the above division of each functional unit and module is used as an example. In actual applications, the above functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the system can be divided into different functional units or modules to complete all or part of the functions described above.
Claims
1. A detection method for the influence of a radio frequency subsystem on the receiver sensitivity, characterized in that, It includes the following steps: Based on the target operating mode of the RF subsystem to be tested, obtain the lowest signal-to-noise ratio of the output signal of the RF subsystem to be tested, and convert the target EVM value according to the lowest signal-to-noise ratio. Based on the target EVM value, configure the signal source device, the RF subsystem to be tested, and the signal analyzer to the target operating mode. When the signal source device generates a modulated RF signal with the same characteristics as the received signal when the RF subsystem to be tested is operating, input the modulated RF signal into the signal analyzer through the RF subsystem to be tested, and output the current EVM value. Compare the current EVM value with the target EVM value. If the difference between the current EVM value and the target EVM value meets the preset threshold, record the RF signal power transmitted by the signal source device at this time as the sensitivity of the RF subsystem to be tested to the overall receiver under the current operating mode.
2. The detection method for the influence of a radio frequency subsystem on the receiver sensitivity according to claim 1, characterized in that, It also includes the following steps: If the current EVM value is greater than the target EVM value, increase the RF signal power of the signal source device until the difference between the current EVM value and the target EVM value meets the preset threshold.
3. The detection method for the influence of a radio frequency subsystem on the receiver sensitivity according to claim 1, characterized in that, It also includes the following steps: If the current EVM value is less than the target EVM value, decrease the RF signal power of the signal source device until the difference between the current EVM value and the target EVM value meets the preset threshold.
4. The detection method for the influence of a radio frequency subsystem on the receiver sensitivity according to claim 2 or 3, characterized in that, When increasing or decreasing the RF signal power of the signal source device, it includes the following steps: When adjusting the RF signal power of the signal source device, the step size is in units of 0.5 dB.
5. The detection method for the influence of a radio frequency subsystem on the receiver sensitivity according to claim 1, characterized in that, The step of converting the target EVM value according to the lowest signal-to-noise ratio includes: Based on EVM max = -SNR min , calculate the target EVM value, where EVM max is the target EVM value, and SNR min is the minimum signal-to-noise ratio of the output signal of the RF subsystem under test in a specific operating mode.
6. A detection system for the influence of a radio frequency subsystem on the receiver sensitivity, characterized in that, The method for detecting the influence of the RF subsystem on the receiver sensitivity according to any one of claims 1-5 includes: A signal source device for generating a modulated RF signal in a specific operating mode. An RF subsystem to be tested for receiving the modulated RF signal generated by the signal source device. A signal analyzer for receiving the in-phase signal and quadrature signal generated by the RF subsystem to be tested and outputting the current EVM value.
7. The detection system for the influence of a radio frequency subsystem on the receiver sensitivity according to claim 6, characterized in that, The RF subsystem to be tested includes an RF subsystem, an analog-to-digital converter, and a digital signal demodulator. The output end of the RF subsystem is electrically connected to the input end of the analog-to-digital converter. The output end of the analog-to-digital converter is electrically connected to the input end of the digital signal demodulator.
8. The detection system for the influence of a radio frequency subsystem on the receiver sensitivity according to claim 6, characterized in that, The signal analyzer uses a signal analyzer with a WiFi measurement option and an analog in-phase signal and quadrature signal measurement option.
9. A computer device, characterized in that, It includes a memory, a processor, and a computer program stored on the memory, and the processor executes the computer program to implement the steps of the method according to any one of claims 1 to 5.
10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, and when the computer program is executed by the processor, it implements the steps of the method according to any one of claims 1 to 5.