Bluetooth receiving sensitivity test circuit and test method

Abstract

The invention discloses a Bluetooth receiving sensitivity test circuit and method. The circuit comprises a preprocessing module, a modulated wave demodulation module and a judgment module, the preprocessing module is used for at least converting the Bluetooth test signal of the first part into a zero intermediate frequency complex signal of a first sampling rate; wherein the Bluetooth test signal is an intermediate frequency complex signal of a second sampling rate, and the first sampling rate is smaller than the second sampling rate; the Bluetooth test signal of the first part comprises a no-load wave signal; the modulated wave demodulation module is used for at least performing cyclic redundancy check on the Bluetooth test signal of the second part, wherein the Bluetooth test signal of the second part comprises a modulated wave signal; the judgment module is used for determining the signal-to-noise ratio of the zero intermediate frequency complex signal of the first sampling rate and judging whether the Bluetooth receiving sensitivity reaches the standard or not according to the signal-to-noise ratio and the cyclic redundancy check result. According to the technical scheme provided by the invention, the test time of the Bluetooth receiving sensitivity can be shortened, and the test efficiency of the Bluetooth sensitivity is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of Bluetooth, and in particular to a testing circuit and method for Bluetooth receiving sensitivity. Background Art

[0002] Bluetooth receiver sensitivity reflects the strength of a Bluetooth chip's signal reception capability. Due to yield issues in chip manufacturing and packaging, the actual sensitivity of some chips is significantly lower than the design specification, which can lead to poor chip connectivity and affect the user experience. To screen out these chips with abnormal sensitivity, it is necessary to add relevant receiver performance tests to the chip testing process. The current testing method sends a certain number of long data packets to Bluetooth and then determines the Bluetooth receiver sensitivity based on the number of data packets received. This test takes a long time. Summary of the Invention

[0003] The present invention provides a test circuit and a test method for Bluetooth receiving sensitivity, so as to reduce the test time of Bluetooth receiving sensitivity and improve the test efficiency of Bluetooth sensitivity.

[0004] According to one aspect of the present invention, a test circuit for Bluetooth receiving sensitivity is provided, the circuit comprising: a pre-processing module, a modulated wave demodulation module and a judgment module;

[0005] The pre-processing module is configured to convert at least a first portion of the Bluetooth test signal into a zero intermediate frequency complex signal at a first sampling rate; wherein the Bluetooth test signal is an intermediate frequency complex signal at a second sampling rate, the first sampling rate being less than the second sampling rate; and the first portion of the Bluetooth test signal includes a null carrier signal;

[0006] The modulated wave demodulation module is used to perform a cyclic redundancy check on at least the second part of the Bluetooth test signal, where the second part of the Bluetooth test signal includes a modulated wave signal;

[0007] The judgment module is used to determine the signal-to-noise ratio of the zero-intermediate-frequency complex signal at the first sampling rate, and to judge whether the Bluetooth receiving sensitivity meets the standard according to the signal-to-noise ratio and the result of the cyclic redundancy check.

[0008] Optionally, the Bluetooth test signal includes a first part transmitted within a first preset time period and a second part transmitted within a second preset time period;

[0009] The pre-processing module receives the first portion of the Bluetooth test signal during the first preset time period;

[0010] The modulated wave demodulation module receives the second portion of the Bluetooth test signal in the second preset time period.

[0011] Optionally, a switch module is further included, wherein the switch module includes a first switch unit and a second switch unit;

[0012] The first end of the first switch unit is connected to the Bluetooth test signal, and the second end of the first switch unit is connected to the input end of the pre-processing module; the first switch unit is turned on during the first preset time period and turned off during the second preset time period;

[0013] The first end of the second switch unit is connected to the Bluetooth test signal, and the second end of the second switch unit is connected to the input end of the modulated wave demodulation module; the second switch unit is turned off in the first preset time period and turned on in the second preset time period.

[0014] Optionally, the pre-processing module includes: a down-conversion unit, a complex filtering unit, a down-sampling unit and a cache unit;

[0015] The first end of the down-conversion unit is connected to the second end of the first switch unit, and the second end of the down-conversion unit is connected to the first end of the complex filtering unit; the down-conversion unit is used to convert the intermediate frequency complex signal of the second sampling rate into a zero intermediate frequency complex signal of the second sampling rate;

[0016] The second end of the complex filtering unit is connected to the first end of the down-sampling unit, and the complex filtering unit is used to filter the zero intermediate frequency complex signal of the second sampling rate;

[0017] The second end of the downsampling unit is connected to the first end of the buffer unit, and the downsampling unit converts the filtered zero intermediate frequency complex signal of the second sampling rate into a zero intermediate frequency complex signal of the first sampling rate;

[0018] The second end of the cache unit is connected to the judgment module, and the cache module is used to store the zero intermediate frequency complex signal of the first sampling rate.

[0019] Optionally, the modulated wave demodulation module includes: a modulation and demodulation unit, a baseband processing unit and a CRC detection unit;

[0020] The first end of the modulation and demodulation unit is connected to the second end of the second switch unit, the second end of the modulation and demodulation unit is connected to the first end of the baseband processing unit, and the modulation and demodulation unit is used to obtain the baseband bit stream of the modulated wave signal;

[0021] The second end of the baseband processing unit is connected to the first end of the CRC detection unit, and the baseband processing unit generates a digital data stream to be verified according to the baseband bit stream;

[0022] The first end of the CRC detection unit is connected to the second end of the baseband processing unit, and the second end of the CRC detection unit is connected to the judgment module. The CRC detection unit is used to perform a cyclic redundancy check on the digital data stream to be verified and transmit the check result to the judgment module.

[0023] Optionally, the judgment module is further used to determine that the Bluetooth receiving sensitivity meets the standard when the signal-to-noise ratio is greater than or equal to a preset demodulation threshold value and the cyclic redundancy check result is successful; and to determine that the Bluetooth receiving sensitivity does not meet the standard when the signal-to-noise ratio is less than a preset demodulation threshold value or the cyclic redundancy check result fails.

[0024] According to a second aspect of the present invention, a method for testing Bluetooth receiver sensitivity is provided, the method comprising: converting at least a first portion of the Bluetooth test signal into a zero intermediate frequency complex signal at a first sampling rate; wherein the Bluetooth test signal is an intermediate frequency complex signal at a second sampling rate, the first sampling rate being less than the second sampling rate; the first portion of the Bluetooth test signal includes a null carrier signal;

[0025] performing a cyclic redundancy check on at least the second portion of the Bluetooth test signal, where the second portion of the Bluetooth test signal includes a modulated wave signal;

[0026] determining a signal-to-noise ratio of the zero-IF complex signal at the first sampling rate;

[0027] Determine whether the Bluetooth receiving sensitivity meets the standard according to the signal-to-noise ratio and the cyclic redundancy check result.

[0028] Optionally, converting at least the first portion of the Bluetooth test signal into a zero intermediate frequency complex signal of a first sampling rate includes:

[0029] Converting the intermediate frequency complex signal of the second sampling rate into a zero intermediate frequency complex signal of the second sampling rate;

[0030] filtering the zero intermediate frequency complex signal of the second sampling rate;

[0031] The filtered zero intermediate frequency complex signal of the second sampling rate is converted into a zero intermediate frequency complex signal of the first sampling rate.

[0032] Optionally, performing a cyclic redundancy check on the second part of the Bluetooth test signal includes:

[0033] Obtaining a baseband bit stream of the modulated wave signal;

[0034] generating a digital data stream to be verified according to the baseband bit stream;

[0035] A cyclic redundancy check is performed on the digital data stream to be verified.

[0036] Optionally, determining whether the Bluetooth receiving sensitivity meets the standard according to the signal-to-noise ratio and the cyclic redundancy check result includes: if the signal-to-noise ratio is greater than or equal to a preset demodulation threshold and the cyclic redundancy check result is successful, determining that the Bluetooth receiving sensitivity meets the standard;

[0037] If the signal-to-noise ratio is less than a preset demodulation threshold or the cyclic redundancy check result fails, it is determined that the Bluetooth receiving sensitivity does not meet the standard.

[0038] The technical solution provided by the embodiment of the present invention converts the empty carrier signal of the first part of the Bluetooth test signal into a zero intermediate frequency complex signal of the first sampling rate with a lower frequency and a lower sampling rate through a preprocessing module to reduce the difficulty of signal processing and shorten the test time; demodulates the modulated wave signal in the Bluetooth test signal and performs a cyclic redundancy check through a modulated wave demodulation module to verify the integrity of the data after transmission; then analyzes the signal-to-noise ratio of the zero intermediate frequency complex signal of the first sampling rate through a judgment module, and then judges whether the Bluetooth receiving sensitivity meets the standard based on the result of the cyclic redundancy check, thereby achieving efficient evaluation of Bluetooth sensitivity with a shorter test time and improving the testing efficiency of Bluetooth sensitivity.

[0039] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 A schematic structural diagram of a Bluetooth receiver sensitivity test circuit provided by an embodiment of the present invention;

[0042] Figure 2 A schematic diagram of a waveform of a Bluetooth test signal provided by an embodiment of the present invention;

[0043] Figure 3 A schematic structural diagram of another Bluetooth receiver sensitivity test circuit provided by an embodiment of the present invention;

[0044] Figure 4 A schematic structural diagram of another Bluetooth receiver sensitivity test circuit provided by an embodiment of the present invention;

[0045] Figure 5A schematic flow chart of a method for testing Bluetooth receiver sensitivity provided by an embodiment of the present invention;

[0046] Figure 6 A flowchart of another method for testing Bluetooth receiver sensitivity provided by an embodiment of the present invention;

[0047] Figure 7 A flowchart of another method for testing Bluetooth receiver sensitivity provided by an embodiment of the present invention;

[0048] Figure 8 A flowchart of a method for determining whether Bluetooth receiving sensitivity meets the standard based on the signal-to-noise ratio and cyclic redundancy check results provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0050] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0051] Figure 1 This is a schematic diagram of a Bluetooth receiver sensitivity test circuit provided by an embodiment of the present invention. Figure 1The circuit includes: a preprocessing module 100, a modulated wave demodulation module 200 and a judgment module 300; the preprocessing module 100 is used to convert at least a first part of the Bluetooth test signal into a zero intermediate frequency complex signal of a first sampling rate; wherein the Bluetooth test signal is an intermediate frequency complex signal of a second sampling rate, and the first sampling rate is less than the second sampling rate; the first part of the Bluetooth test signal includes a null carrier signal; the modulated wave demodulation module 200 is used to perform a cyclic redundancy check on at least the second part of the Bluetooth test signal, and the second part of the Bluetooth test signal includes a modulated wave signal; the judgment module 300 is used to determine the signal-to-noise ratio of the zero intermediate frequency complex signal of the first sampling rate, and judge whether the Bluetooth receiving sensitivity meets the standard based on the signal-to-noise ratio and the results of the cyclic redundancy check.

[0052] Specifically, the Bluetooth test signal can be an intermediate frequency complex signal of the second sampling rate emitted by the signal source 10, including a real part and an imaginary part. The Bluetooth test signal can be used to perform Bluetooth sensitivity calibration. The length of the Bluetooth test signal can be the length of a data packet, and can be divided into a first part of the Bluetooth test signal and a second part of the Bluetooth test signal in chronological order. The first part of the Bluetooth test signal can be an empty carrier signal, which can be a pure unmodulated sine wave; the second part of the Bluetooth test signal can be a modulated wave signal, which can be a carrier wave carrying data information and containing data information. The preprocessing module 100 can convert the sampling rate and frequency of the empty carrier signal, that is, convert the intermediate frequency complex signal of the second sampling rate into a zero intermediate frequency signal of the first sampling rate, so as to reduce the difficulty of signal processing and shorten the test time. The modulated wave demodulation module 200 can demodulate the modulated wave signal and perform a cyclic redundancy check to verify the integrity of the data after transmission. The judgment module 300 can be a host computer, which can perform a fast Fourier transform on the zero intermediate frequency complex signal of the first sampling rate converted by the preprocessing module 100, analyze and obtain the signal-to-noise ratio of the zero intermediate frequency complex signal of the first sampling rate, and then combine the result of the cyclic redundancy check to determine whether the Bluetooth receiving sensitivity of the Bluetooth chip meets the standard.

[0053] The technical solution provided by an embodiment of the present invention utilizes a data packet to convert the empty carrier signal in the first part of the Bluetooth test signal into a zero-IF complex signal of a first sampling rate with a lower frequency and a lower sampling rate through a preprocessing module to reduce the difficulty of signal processing and shorten the test time; the modulated wave signal in the Bluetooth test signal is demodulated and cyclically redundancy checked through a modulated wave demodulation module to verify the integrity of the data after transmission; the signal-to-noise ratio of the zero-IF complex signal of the first sampling rate is then analyzed through a judgment module, and then combined with the results of the cyclic redundancy check to determine whether the Bluetooth receiving sensitivity meets the standard. Compared to testing through multiple data packets, the technical solution provided by the present invention can achieve efficient evaluation of Bluetooth sensitivity in a shorter test time through a testing method using a single data packet, thereby improving the testing efficiency of Bluetooth sensitivity.

[0054] Optionally, Figure 2 A schematic diagram of a Bluetooth test signal waveform provided by an embodiment of the present invention. Figure 1 and Figure 2 The Bluetooth test signal includes a first portion transmitted within a first preset time period and a second portion transmitted within a second preset time period; the preprocessing module 100 receives the first portion of the Bluetooth test signal within the first preset time period; and the modulated wave demodulation module 200 receives the second portion of the Bluetooth test signal within the second preset time period.

[0055] Specifically, the Bluetooth test signal can be divided into an empty carrier signal of a first preset time period and a modulated wave signal of a second preset time period according to the time period. The preprocessing module 100 can convert the empty carrier signal of the Bluetooth test signal within the first preset time period, which can be understood as the preprocessing module 100 converting the intermediate frequency complex signal of the second sampling rate within the first preset time period into a zero intermediate frequency complex signal of the first sampling rate. The modulated wave demodulation module 200 can demodulate the Bluetooth test signal within the second preset time period, which can be understood as the modulated wave demodulation module 200 demodulating the modulated wave signal within the second preset time period and performing a cyclic redundancy check. For example, as Figure 2 As shown, the Bluetooth test signal is a complex signal with a sampling rate of 24MHz, consisting of real and imaginary parts, with a total duration of 1 millisecond. The first 900 microseconds are the null carrier signal, and the last 100 microseconds are the modulated wave signal. Correspondingly, the first preset time period is 900 microseconds, and the second preset time period is 100 microseconds. The preprocessing module 100 receives the first portion of the null carrier signal during the first preset time period, i.e., the first 900 microseconds; the modulated wave demodulation module 200 receives the second portion of the modulated wave signal during the last 100 microseconds. It should be noted that the first preset time period can be adjusted based on the sampling rate of the Bluetooth test signal. The lower the sampling rate of the Bluetooth test signal, the longer the first preset time period can be set to ensure the accuracy of the test results. The second preset time period of Bluetooth test signals with different sampling rates can be set to 100 microseconds. It should be noted that the method provided in the embodiment of the present invention can also change the processing order of the Bluetooth test signal, that is, first perform cyclic redundancy check on the modulated wave signal of the second part, and then convert the empty carrier signal of the first part. Compared with the existing technology, it can also greatly reduce the test time and ensure the test accuracy.

[0056] Optionally, Figure 3 This is a schematic diagram of a structure of another Bluetooth receiver sensitivity test circuit provided by an embodiment of the present invention. Figure 2 and Figure 3The Bluetooth receiving sensitivity test circuit also includes a switch module 400, which includes a first switch unit 410 and a second switch unit 420; a first end of the first switch unit 410 is connected to the Bluetooth test signal, and a second end of the first switch unit 410 is connected to the input end of the preprocessing module 100; the first switch unit 410 is turned on during a first preset time period and turned off during a second preset time period; a first end of the second switch unit 420 is connected to the Bluetooth test signal, and a second end of the second switch unit 420 is connected to the input end of the modulated wave demodulation module 200; the second switch unit 420 is turned off during the first preset time period and turned on during the second preset time period.

[0057] Specifically, the switch module 400 can control the on and off states of the first switch unit 410 and the second switch unit 420 through timing to control the transmission path of the Bluetooth test signal in different time periods. For example, taking the Bluetooth test signal as Figure 2 This example uses a complex signal with a total duration of 1 millisecond and a sampling rate of 24 MHz as an example. During the first 900 microseconds of the test, the first switch unit 410 is closed and the second switch unit 420 is open, transmitting the Bluetooth test signal to the preprocessing module 100. 100 microseconds after the test, the first switch unit 410 is open and the second switch unit 420 is closed, transmitting the signal to the modulated wave demodulation module 200. The alternating control method provided by the present invention ensures that the preprocessing module 100 and the modulated wave demodulation module 200 operate only during the corresponding data segments, achieving a low-power design.

[0058] Optionally, Figure 4 This is a schematic diagram of a structure of another Bluetooth receiver sensitivity test circuit provided by an embodiment of the present invention. Figure 2 and Figure 4 The preprocessing module 100 includes: a down-conversion unit 110, a complex filtering unit 120, a down-sampling unit 130 and a buffer unit 140; a first end of the down-conversion unit 110 is connected to the second end of the first switch unit 410, and a second end of the down-conversion unit 110 is connected to the first end of the complex filtering unit 120; the down-conversion unit 110 is used to convert the intermediate frequency complex signal of the second sampling rate into a zero intermediate frequency complex signal of the second sampling rate; the second end of the complex filtering unit 120 is connected to the first end of the down-sampling unit 130, and the complex filtering unit 120 is used to filter the zero intermediate frequency complex signal of the second sampling rate; the second end of the down-sampling unit 130 is connected to the first end of the buffer unit 140, and the down-sampling unit 130 converts the filtered zero intermediate frequency complex signal of the second sampling rate into a zero intermediate frequency complex signal of the first sampling rate; the second end of the buffer unit 140 is connected to the judgment module 300, and the buffer module is used to store the zero intermediate frequency complex signal of the first sampling rate.

[0059] Specifically, the down-conversion unit 110, the complex filtering unit 120, the down-sampling unit 130, and the buffer unit 140 are sequentially connected in series between the signal source 10 and the judgment module 300. The input end of the down-conversion unit 110 can be connected to the second end of the first switching unit 410, receiving the intermediate frequency complex signal at the second sampling rate from the signal source 10, converting the signal into a zero intermediate frequency complex signal at the second sampling rate, and then transmitting the signal to the complex filtering unit 120. The down-conversion unit 110 can be a digital circuit based on a coordinate rotation digital computer algorithm. The input end of the complex filtering unit 120 is connected to the output end of the down-conversion unit 110, performing low-pass filtering on the zero intermediate frequency complex signal at the second sampling rate, and transmitting the signal to the down-sampling unit 130. The complex filtering unit 120 can limit high-frequency noise and provide anti-aliasing effects to ensure signal integrity. The filtered signal can retain the valid signal within the Bluetooth signal passband and filter out out-of-band components to prevent aliasing during downsampling. The input end of the downsampling unit 130 is connected to the output end of the complex filtering unit 120. The downsampling unit 130 can downsample the filtered zero-IF complex signal at the second sampling rate to generate a zero-IF complex signal at the first sampling rate, and transmit and store the signal in the cache unit 140. The cache unit 140 can temporarily store the downsampling results. By buffering the data, the processing speed difference between the judgment module 300 and the downsampling unit 130 can be alleviated, the frequency of interaction with the judgment module 300 can be reduced, the data transmission efficiency can be improved, and the test throughput can be optimized.

[0060] Optionally, based on the above embodiment, continue to refer to Figure 4 The modulation wave demodulation module 200 includes: a modulation and demodulation unit 210, a baseband processing unit 220 and a CRC detection unit 230; the first end of the modulation and demodulation unit 210 is connected to the second end of the second switch unit 420, the second end of the modulation and demodulation unit 210 is connected to the first end of the baseband processing unit 220, and the modulation and demodulation unit 210 is used to obtain the baseband bit stream of the modulation wave signal; the second end of the baseband processing unit 220 is connected to the first end of the CRC detection unit 230, and the baseband processing unit 220 generates a digital data stream to be verified according to the baseband bit stream; the first end of the CRC detection unit 230 is connected to the second end of the baseband processing unit 220, and the second end of the CRC detection unit 230 is connected to the judgment module 300, and the CRC detection unit 230 is used to perform a cyclic redundancy check on the digital data stream to be verified and transmit the check result to the judgment module 300.

[0061] Specifically, the modem unit 210, the baseband processing unit 220, and the CRC detection unit 230 can be connected in series between the second switch unit 420 and the judgment module 300. The input end of the modem unit 210 can be connected to the second end of the second switch unit 420, receive the modulated wave data segment from the signal source 10, and perform modulation to extract the baseband bit stream. The baseband processing unit 220 can perform synchronization, decoding, and data recovery on the baseband bit stream to generate a digital data stream to be verified. The CRC detection unit 230 can perform a cyclic redundancy check on the digital data stream, verify the integrity of the Bluetooth receiving path through error detection, and output the result to the judgment module 300.

[0062] Optionally, based on the above embodiment, continue to refer to Figure 4 The judgment module 300 is further configured to determine that the Bluetooth receiving sensitivity meets the standard when the signal-to-noise ratio is greater than or equal to the preset demodulation threshold and the cyclic redundancy check result is successful; and to determine that the Bluetooth receiving sensitivity does not meet the standard when the signal-to-noise ratio is less than the preset demodulation threshold or the cyclic redundancy check result fails.

[0063] Specifically, the preprocessing module 100 verifies the noise figure of the chip's RF path through signal-to-noise ratio analysis, ensuring that the Bluetooth in-band signal-to-noise ratio meets the demodulation threshold requirements of the modem module 200. The modulated wave demodulation module 200 verifies the proper operation of the Bluetooth low energy modem module's baseband data processing digital circuitry by performing a cyclic redundancy check on a single transmission packet. The judgment module 300 determines that the Bluetooth receiver sensitivity meets the standard when the signal-to-noise ratio of the zero-IF complex signal at the first sampling rate is greater than or equal to the preset demodulation threshold and the cyclic redundancy check is successful. If the signal-to-noise ratio of the zero-IF complex signal at the first sampling rate is less than the preset demodulation threshold or the cyclic redundancy check fails, the Bluetooth receiver sensitivity is determined to be substandard. It can be understood that a signal-to-noise ratio greater than or equal to the preset demodulation threshold and a passing cyclic redundancy check constitute both sufficient and necessary conditions for Bluetooth receiver sensitivity to meet the standard. The preset demodulation threshold can be 14dB.

[0064] Figure 5 A flow chart of a method for testing Bluetooth receiver sensitivity provided by an embodiment of the present invention. Figure 5 The method comprises:

[0065] S110, converting at least a first portion of the Bluetooth test signal into a zero-IF complex signal at a first sampling rate; wherein the Bluetooth test signal is an IF complex signal at a second sampling rate, the first sampling rate being less than the second sampling rate; and the first portion of the Bluetooth test signal includes a null carrier signal;

[0066] Specifically, the signal source emits an intermediate frequency complex signal with two sampling rates. The intermediate frequency complex signal with the second sampling rate can be divided into a first part of the Bluetooth test signal and a second part of the Bluetooth test signal in chronological order. The first part of the Bluetooth test signal can be a null carrier signal, and the null carrier signal can be a pure unmodulated sine wave. The preprocessing module can convert the sampling rate and frequency of the null carrier signal, that is, convert the intermediate frequency complex signal with the second sampling rate into a zero intermediate frequency signal with the first sampling rate, so as to reduce the difficulty of signal processing and shorten the test time.

[0067] S120, performing a cyclic redundancy check on at least the second portion of the Bluetooth test signal, where the second portion of the Bluetooth test signal includes a modulated wave signal;

[0068] Specifically, the second part of the Bluetooth test signal may be a modulated wave signal, which may be a carrier wave carrying data information. The modulated wave demodulation module may demodulate the modulated wave signal and perform a cyclic redundancy check to verify the integrity of the transmitted data.

[0069] S130, determining a signal-to-noise ratio of a zero-IF complex signal at a first sampling rate;

[0070] Specifically, the judgment module may perform a fast Fourier transform on the zero intermediate frequency complex signal of the first sampling rate converted by the preprocessing module, and analyze and obtain the signal-to-noise ratio of the zero intermediate frequency complex signal of the first sampling rate.

[0071] S140: Determine whether the Bluetooth receiving sensitivity meets the standard according to the signal-to-noise ratio and the cyclic redundancy check result.

[0072] Specifically, the judgment module compares the signal-to-noise ratio with the preset demodulation threshold value and judges whether the Bluetooth receiving sensitivity of the Bluetooth chip meets the standard in combination with the result of the cyclic redundancy check. Figure 6 A flow chart of another method for testing Bluetooth receiver sensitivity provided by an embodiment of the present invention. Figure 6 , the method comprising:

[0073] S210, converting the intermediate frequency complex signal of the second sampling rate into a zero intermediate frequency complex signal of the second sampling rate;

[0074] Specifically, the down-conversion unit can be a digital circuit based on a coordinate rotation digital computer algorithm. The down-conversion unit can receive an intermediate frequency complex signal of the second sampling rate from a signal source, convert it into a zero intermediate frequency complex signal of the second sampling rate, and then transmit it to the complex filtering unit. S220, filter the zero intermediate frequency complex signal of the second sampling rate;

[0075] Specifically, the complex filtering unit can low-pass filter the zero-IF complex signal at the second sampling rate and transmit it to the downsampling unit. The complex filtering unit can limit high-frequency noise and provide anti-aliasing effects to ensure signal integrity. The filtered signal can retain the valid signal within the Bluetooth signal passband and filter out out-of-band components to prevent aliasing during downsampling.

[0076] S230 : Convert the filtered zero intermediate frequency complex signal of the second sampling rate into a zero intermediate frequency complex signal of the first sampling rate.

[0077] Specifically, the downsampling unit may downsample the filtered zero intermediate frequency complex signal of the second sampling rate, reduce the sampling rate of the zero intermediate frequency complex signal of the second sampling rate, and generate a zero intermediate frequency complex signal of the first sampling rate.

[0078] S240, performing a cyclic redundancy check on at least the second portion of the Bluetooth test signal, where the second portion of the Bluetooth test signal includes a modulated wave signal;

[0079] S250, determining a signal-to-noise ratio of a zero-IF complex signal at a first sampling rate;

[0080] S260: Determine whether the Bluetooth receiver sensitivity meets the standard based on the signal-to-noise ratio and the cyclic redundancy check result. Figure 7 A flow chart of another method for testing Bluetooth receiver sensitivity provided by an embodiment of the present invention. Figure 7 , the method comprising:

[0081] S310, converting the intermediate frequency complex signal of the second sampling rate into a zero intermediate frequency complex signal of the second sampling rate;

[0082] S320, filtering the zero intermediate frequency complex signal of the second sampling rate;

[0083] S330, converting the filtered zero intermediate frequency complex signal of the second sampling rate into a zero intermediate frequency complex signal of the first sampling rate;

[0084] S340, obtaining a baseband bit stream of a modulated wave signal;

[0085] Specifically, the input end of the modulation and demodulation unit receives the modulated wave data segment of the signal source, and demodulates the modulated wave signal to extract the baseband bit stream.

[0086] S350, generating a digital data stream to be verified according to the baseband bit stream;

[0087] Specifically, the baseband processing unit may perform synchronization, decoding, and data recovery on the baseband bit stream to generate a digital data stream to be verified.

[0088] S360: Perform a cyclic redundancy check on the digital data stream to be verified.

[0089] Specifically, the CRC detection unit can perform a cyclic redundancy check on the digital data stream, verify the integrity of the Bluetooth receiving path through error detection, and output the result to the judgment module.

[0090] S370, determining a signal-to-noise ratio of a zero-IF complex signal at a first sampling rate;

[0091] S380: Determine whether the Bluetooth receiving sensitivity meets the standard based on the signal-to-noise ratio and the cyclic redundancy check result.

[0092] Optionally, Figure 8 A flow chart of a method for determining whether Bluetooth receiver sensitivity meets the standard based on the signal-to-noise ratio and cyclic redundancy check results provided by an embodiment of the present invention. Figure 8 , determine whether the Bluetooth receiving sensitivity meets the standard based on the signal-to-noise ratio and cyclic redundancy check results, including:

[0093] S410: If the signal-to-noise ratio is greater than or equal to the preset demodulation threshold and the cyclic redundancy check result is successful, it is determined that the Bluetooth receiving sensitivity meets the standard;

[0094] Specifically, the judgment module can determine that the Bluetooth receiver sensitivity meets the standard when the signal-to-noise ratio of the zero-IF complex signal at the first sampling rate is greater than or equal to a preset demodulation threshold and the cyclic redundancy check result is successful. The signal-to-noise ratio of the zero-IF complex signal at the first sampling rate being greater than or equal to the preset demodulation threshold ensures that the Bluetooth in-band signal-to-noise ratio meets the demodulation threshold requirement of the modem module. The successful cyclic redundancy check result verifies that the Bluetooth modem module and the baseband data processing digital circuit are functioning properly. Therefore, when both meet the standards, the Bluetooth receiver sensitivity is considered to meet the standard.

[0095] S420: If the signal-to-noise ratio is less than the preset demodulation threshold or the cyclic redundancy check result fails, it is determined that the Bluetooth receiving sensitivity does not meet the standard.

[0096] Specifically, the judgment module may judge that the Bluetooth receiving sensitivity does not meet the standard when the signal-to-noise ratio of the zero intermediate frequency complex signal at the first sampling rate is less than a preset demodulation threshold or the cyclic redundancy check fails.

[0097] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0098] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A Bluetooth receiver sensitivity test circuit, characterized in that: include: Pre-processing module, modulation wave demodulation module and judgment module; The pre-processing module is configured to convert at least a first portion of the Bluetooth test signal into a zero intermediate frequency complex signal at a first sampling rate; wherein the Bluetooth test signal is an intermediate frequency complex signal at a second sampling rate, the first sampling rate being less than the second sampling rate; and the first portion of the Bluetooth test signal includes a null carrier signal; The modulated wave demodulation module is used to perform a cyclic redundancy check on at least the second part of the Bluetooth test signal, where the second part of the Bluetooth test signal includes a modulated wave signal; The judgment module is used to determine the signal-to-noise ratio of the zero-intermediate-frequency complex signal at the first sampling rate, and to judge whether the Bluetooth receiving sensitivity meets the standard according to the signal-to-noise ratio and the result of the cyclic redundancy check.

2. The Bluetooth receiving sensitivity test circuit according to claim 1, characterized in that: The Bluetooth test signal includes a first portion transmitted within a first preset time period and a second portion transmitted within a second preset time period; The pre-processing module receives the first portion of the Bluetooth test signal during the first preset time period; The modulated wave demodulation module receives the second portion of the Bluetooth test signal in the second preset time period.

3. The Bluetooth receiving sensitivity test circuit according to claim 2, characterized in that: Also included is a switch module, the switch module including a first switch unit and a second switch unit; The first end of the first switch unit is connected to the Bluetooth test signal, and the second end of the first switch unit is connected to the input end of the pre-processing module; the first switch unit is turned on during the first preset time period and turned off during the second preset time period; The first end of the second switch unit is connected to the Bluetooth test signal, and the second end of the second switch unit is connected to the input end of the modulated wave demodulation module; the second switch unit is turned off in the first preset time period and turned on in the second preset time period.

4. The Bluetooth receiving sensitivity test circuit according to claim 3, characterized in that: The pre-processing module includes: a down-conversion unit, a complex filtering unit, a down-sampling unit and a cache unit; The first end of the down-conversion unit is connected to the second end of the first switch unit, and the second end of the down-conversion unit is connected to the first end of the complex filtering unit; the down-conversion unit is used to convert the intermediate frequency complex signal of the second sampling rate into a zero intermediate frequency complex signal of the second sampling rate; The second end of the complex filtering unit is connected to the first end of the down-sampling unit, and the complex filtering unit is used to filter the zero intermediate frequency complex signal of the second sampling rate; The second end of the downsampling unit is connected to the first end of the buffer unit, and the downsampling unit converts the filtered zero intermediate frequency complex signal of the second sampling rate into a zero intermediate frequency complex signal of the first sampling rate; A second end of the cache unit is connected to the judgment module, and the cache unit is used to store the zero intermediate frequency complex signal of the first sampling rate.

5. The Bluetooth receiving sensitivity test circuit according to claim 3, characterized in that: The modulation wave demodulation module includes: a modulation and demodulation unit, a baseband processing unit and a CRC detection unit; The first end of the modulation and demodulation unit is connected to the second end of the second switch unit, the second end of the modulation and demodulation unit is connected to the first end of the baseband processing unit, and the modulation and demodulation unit is used to obtain the baseband bit stream of the modulated wave signal; The second end of the baseband processing unit is connected to the first end of the CRC detection unit, and the baseband processing unit generates a digital data stream to be verified according to the baseband bit stream; The first end of the CRC detection unit is connected to the second end of the baseband processing unit, and the second end of the CRC detection unit is connected to the judgment module. The CRC detection unit is used to perform a cyclic redundancy check on the digital data stream to be verified and transmit the check result to the judgment module.

6. The Bluetooth receiving sensitivity test circuit according to claim 1, characterized in that: The judgment module is further configured to determine that the Bluetooth receiving sensitivity meets the standard when the signal-to-noise ratio is greater than or equal to a preset demodulation threshold and the cyclic redundancy check result is successful; and to determine that the Bluetooth receiving sensitivity does not meet the standard when the signal-to-noise ratio is less than the preset demodulation threshold or the cyclic redundancy check result fails.

7. A method for testing Bluetooth receiver sensitivity, characterized in that: include: Convert at least a first portion of the Bluetooth test signal into a zero intermediate frequency complex signal at a first sampling rate; wherein the Bluetooth test signal is an intermediate frequency complex signal at a second sampling rate, the first sampling rate being less than the second sampling rate; and the first portion of the Bluetooth test signal includes a null carrier signal; performing a cyclic redundancy check on at least the second portion of the Bluetooth test signal, where the second portion of the Bluetooth test signal includes a modulated wave signal; determining a signal-to-noise ratio of the zero-IF complex signal at the first sampling rate; Determine whether the Bluetooth receiving sensitivity meets the standard according to the signal-to-noise ratio and the cyclic redundancy check result.

8. The method for testing Bluetooth receiving sensitivity according to claim 7, wherein: Converting at least the first portion of the Bluetooth test signal into a zero intermediate frequency complex signal at a first sampling rate comprises: Converting the intermediate frequency complex signal of the second sampling rate into a zero intermediate frequency complex signal of the second sampling rate; filtering the zero intermediate frequency complex signal of the second sampling rate; The filtered zero intermediate frequency complex signal of the second sampling rate is converted into a zero intermediate frequency complex signal of the first sampling rate.

9. The method for testing Bluetooth receiving sensitivity according to claim 7, wherein: Perform a cyclic redundancy check on the second part of the Bluetooth test signal, including: Obtaining a baseband bit stream of the modulated wave signal; generating a digital data stream to be verified according to the baseband bit stream; A cyclic redundancy check is performed on the digital data stream to be verified.

10. The method for testing Bluetooth receiving sensitivity according to claim 7, wherein: Determining whether the Bluetooth receiving sensitivity meets the standard according to the signal-to-noise ratio and the cyclic redundancy check result, including: if the signal-to-noise ratio is greater than or equal to a preset demodulation threshold and the cyclic redundancy check result is successful, determining that the Bluetooth receiving sensitivity meets the standard; If the signal-to-noise ratio is less than a preset demodulation threshold or the cyclic redundancy check result fails, it is determined that the Bluetooth receiving sensitivity does not meet the standard.

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