Signal receiving link, chip, electronic device, apparatus and signal processing method
By introducing whitening processing into the signal receiving link of the UWB chip, the randomness of the signal is enhanced, the quantization noise problem caused by excessively strong through signal is solved, and the ranging and positioning effects are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CALTERAH SEMICON TECH (SHANGHAI) CO LTD
- Filing Date
- 2025-11-07
- Publication Date
- 2026-06-02
AI Technical Summary
During the ranging and positioning process of UWB chips, an excessively strong direct signal can cause the reflected signal to be submerged in quantization noise, making it difficult to obtain and affecting the ranging and positioning results.
Whitening processing is introduced into the signal receiving link. The randomness of the signal is enhanced by analog and digital signal processing modules, the correlation of quantization noise is reduced, and the whitened signal is used to reduce the processing of subsequent signals to improve the processing gain.
Whitening enhances the randomness of the signal, reduces the correlation of quantization noise, and improves the ranging and positioning performance.
Smart Images
Figure CN122137419A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of ultra-wideband technology, and in particular to a signal receiving link, chip, electronic device, equipment, and signal processing method. Background Technology
[0002] When Ultra Wide Band (UWB) chips (or circuits, devices, equipment, etc.) perform ranging and / or positioning, the direct path signal from Tx (transmitter) to Rx (receiver) is very strong. This causes the reflected signal to be typically tens of decibels (dB) weaker than the direct path signal. In this case, most of the energy in the data sampled by the analog-to-digital converter (ADC) is the direct path signal component, making it difficult to obtain the reflected signal. To address this issue, a digital direct path cancellation scheme has been proposed. This scheme estimates the direct path signal in the digital domain and generates an inverted signal of corresponding magnitude and timing to cancel the direct path signal.
[0003] However, digital cancellation of through-signal schemes cannot solve the problem of excessive correlation of quantization noise, and reflected signals may still be difficult to obtain, sometimes resulting in poor ranging and / or positioning performance. Summary of the Invention
[0004] This application provides a signal receiving link, chip, electronic device, equipment, and signal processing method, which can further reduce the interference of quantization noise and improve the ranging and / or positioning effect.
[0005] According to some embodiments of this application, a first aspect of this application provides a UWB signal receiving link, including: a radio frequency signal receiver, a first adder, an analog-to-digital converter, a second adder, and a baseband processor connected sequentially according to a received signal transmission processing path; a sequence generator, a delay unit, and a multiplier connected sequentially, the multiplier being connected to the second adder; and a digital-to-analog converter, the sequence generator being further connected to the first adder through the digital-to-analog converter; wherein, the first adder is configured to use an analog whitening signal output by the digital-to-analog converter to whiten the received signal output by the radio frequency signal receiver and then output it to the input terminal of the analog-to-digital converter; the second adder is configured to use a digital whitening signal output by the multiplier after inversion to reduce the digital received signal output by the analog-to-digital converter.
[0006] In some embodiments, the sequence generator is configured to generate pseudo-random sequences, sequences conforming to a Gaussian distribution, or other sequences that can whiten the data.
[0007] According to some embodiments of this application, a second aspect of this application provides a radio frequency signal receiving link, including: a radio frequency module configured to receive and output analog signals via an antenna; a whitening module connected to the radio frequency module configured to generate an analog whitening signal, and to perform whitening processing on the analog signal output by the radio frequency module based on the analog whitening signal and then output it; an analog-to-digital conversion module connected to the whitening module configured to perform analog-to-digital conversion on the analog signal output by the whitening module and then output it; and a processing module connected to the analog-to-digital conversion module configured to process the digital signal output by the analog-to-digital conversion module.
[0008] In some embodiments, the whitening module includes a signal source and a whitening processing submodule connected in sequence, wherein the whitening processing submodule is configured to use a signal generated by the signal source to whiten the analog signal output by the radio frequency module.
[0009] In some embodiments, the signal source includes: a digital signal generator; the whitening processing submodule includes a digital-to-analog converter and a first adder connected in sequence; the digital signal generator is configured to generate and output a whitening timing sequence; the digital-to-analog converter is configured to perform digital-to-analog conversion on the whitening timing sequence output by the digital signal generator to obtain the analog whitening signal, and output it; the first adder is connected to the radio frequency module and is configured to superimpose the analog whitening signal output by the digital-to-analog converter and the analog signal output by the radio frequency module and output them.
[0010] In some embodiments, the radio frequency signal receiving link further includes a denoising module, the analog-to-digital conversion module and the processing module are connected through the denoising module, the denoising module is connected to the digital signal generator and is configured to perform denoising processing on the digital signal output by the analog-to-digital conversion module according to the whitening timing sequence output by the digital signal generator.
[0011] In some embodiments, the denoising module includes a delay unit, a multiplier, and a second adder connected in sequence; the delay unit is connected to the digital signal generator and is configured to delay the whitening timing sequence output by the digital signal generator so that the output signal, after passing through the multiplier, has the same timing as the digital signal output by the analog-to-digital conversion module; the multiplier is configured to invert the signal output by the delay unit; the second adder is connected to the analog-to-digital conversion module and the processing module respectively, and is configured to superimpose the digital signal output by the analog-to-digital conversion module and the signal output by the multiplier.
[0012] In some embodiments, the signal source includes an analog signal generator, and the whitening processing submodule includes a third adder; the analog signal generator is configured to generate a random analog signal to output the analog whitening signal; the third adder is connected to the radio frequency module and is configured to superimpose and output the analog whitening signal output by the analog signal generator and the analog signal output by the radio frequency module.
[0013] In some embodiments, the simulated whitening signal includes a pseudo-random simulated signal or a simulated signal conforming to a Gaussian distribution.
[0014] According to some embodiments of this application, a third aspect of this application also provides a chip, including: a UWB signal receiving link as described in any one of the first aspects, or a radio frequency signal receiving link as described in any one of the second aspects.
[0015] According to some embodiments of this application, a fourth aspect of this application also provides an electronic device, including: a carrier; a signal receiving link, wherein the signal receiving link is a UWB signal receiving link as described in any one of the first aspects, or a radio frequency signal receiving link as described in any one of the second aspects, disposed on the carrier; an antenna, disposed on the carrier, or the antenna and the circuit are integrated into a single device disposed on the carrier; wherein the signal receiving link is connected to the antenna and is used to receive radio frequency received signals.
[0016] According to some embodiments of this application, a fifth aspect of this application also provides a terminal device, including: a device body; and electronic devices as described in the fourth aspect disposed on the device body; wherein the electronic devices are used for target detection and / or communication to provide reference information to the operation of the device body.
[0017] According to some embodiments of this application, a sixth aspect of this application also provides a signal processing method, including: receiving an analog signal and generating an analog whitening signal; performing whitening processing on the received analog signal based on the analog whitening signal; and performing analog-to-digital conversion on the whitened signal.
[0018] The technical solution provided in this application has at least the following advantages: By whitening the signal before analog-to-digital conversion, the randomness of the signal is enhanced. Therefore, although the subsequent analog-to-digital conversion process introduces quantization noise, the correlation of the quantization noise is weakened due to the whitening of the signal. This increases the potential processing gain of the subsequent processing, which is more conducive to signal processing for ranging and / or positioning, and can achieve better ranging and / or positioning results. Attached Figure Description
[0019] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.
[0020] Figure 1 This is a schematic diagram of the structure of a UWB signal receiving link provided in one embodiment of this application; Figure 2 This is a schematic diagram of the structure of a radio frequency signal receiving link provided in another embodiment of this application; Figure 3 This is a schematic diagram of the structure of a radio frequency signal receiving link provided in another embodiment of this application. Figure 2 ; Figure 4 This is a schematic diagram of the structure of a radio frequency signal receiving link provided in another embodiment of this application. Figure 3 ; Figure 5 This is a schematic diagram of the structure of a radio frequency signal receiving link provided in another embodiment of this application. Figure 4 ; Figure 6 This is a schematic diagram of the structure of a radio frequency signal receiving link provided in another embodiment of this application. Figure 5 ; Figure 7 This is a schematic diagram of the structure of a radio frequency signal receiving link provided in another embodiment of this application. Figure 6 ; Figure 8 This is a statistical graph showing the change in the decoding bit error rate of the existing UWB signal receiving link as a function of signal amplitude. Figure 9 This application Figure 3 A statistical graph showing the variation of the decoding bit error rate of the RF signal receiving link with the variance of whitening noise in the illustrated embodiment. Figure 10 This application Figure 7 A statistical graph showing the variation of the decoding bit error rate of the RF signal receiving link with the variance of whitening noise in the illustrated embodiment. Figure 11 This is a flowchart of a signal processing method provided in another embodiment of this application. Detailed Implementation
[0021] As is known from the background art, digital signal cancellation schemes sometimes result in poor ranging and / or positioning performance.
[0022] Analysis revealed that the problem stemmed from the following: due to the excessively strong through signal, even if a digital through signal cancellation scheme was used to completely eliminate the through signal at the digital end, there might still be instances where the reflected signal (the signal used to measure the actual flight time between the transmitter and receiver for positioning and / or ranging) is less than the quantization noise. In such cases, the reflected signal is submerged in the quantization noise, resulting in the signal processing gain not being properly achieved during subsequent digital signal processing after analog-to-digital conversion, thus affecting the positioning and / or ranging performance.
[0023] To address the aforementioned issues, this application provides a signal receiving link, chip, electronic device, equipment, and signal processing method. By introducing whitening processing, the randomness of whitening reduces the correlation of quantization noise, thereby increasing the potential processing gain of subsequent processing. For example, due to whitening, the signal may no longer be submerged in quantization noise, thus the signal processing (such as despreading) gain can be better obtained, which is more conducive to signal processing for ranging and / or positioning, resulting in better ranging and / or positioning effects. To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the various embodiments of this application will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of this application to enable readers to better understand this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various changes and modifications based on the following embodiments.
[0024] The division of the following embodiments is for ease of description and should not constitute any limitation on the specific implementation of this application. The various embodiments can be combined with and referenced by each other without contradiction.
[0025] This application provides a UWB signal receiving link, which can be applied to UWB chips, devices, or equipment to achieve positioning and / or ranging functions in radar mode. Of course, this link can also be applied in other modes, such as communication mode to achieve communication based on signal transmission and reception. For example, this UWB signal receiving link can act as a digital key, confirming the presence of a bound user vehicle in the current garage through communication mode, and then continuously providing the user with route instructions to the vehicle through positioning and ranging in radar mode. Further details will not be elaborated here. The following will combine... Figure 1 The UWB signal receiving link provided in the embodiments of this application will be described.
[0026] like Figure 1As shown, the UWB signal receiving link includes: a radio frequency signal receiver a1, a first adder a2, an analog-to-digital converter a3, a second adder a4, and a baseband processor a5 connected sequentially according to the received signal transmission and processing path; a sequence generator b1, a delay unit b2, and a multiplier b3 connected sequentially, with multiplier b3 connected to the second adder a4; and a digital-to-analog converter c1, with the sequence generator b1 also connected to the first adder a2 via the digital-to-analog converter c1; wherein, the first adder a2 is configured to use the analog whitening signal output from the digital-to-analog converter c1 to whiten the received signal output from the radio frequency signal receiver a1 and then output it to the input terminal of the analog-to-digital converter a3; the second adder a4 is configured to use the digital whitening signal output from the multiplier b3 after inversion to reduce the digital received signal output from the analog-to-digital converter a3.
[0027] Therefore, by providing an analog whitening signal through sequence generator b1 and digital-to-analog converter c1, and whitening the received signal output from RF signal receiver a1 at the first adder a2, the randomness of the signal is enhanced. Although the subsequent analog-to-digital conversion process introduces quantization noise, the correlation of the quantization noise is weakened due to signal whitening. This increases the potential processing gain of subsequent processing, which is more beneficial to signal processing and can achieve better application results. Furthermore, through the cooperation of the second adder a4 and multiplier b3, the digital whitening signal output from analog-to-digital converter a3 is reduced by inverting the output digital whitening signal, effectively eliminating the influence of analog whitening noise (i.e., the white noise formed by the addition of the aforementioned analog whitening signal), making the signal purer and further improving the effect.
[0028] In some embodiments, to provide a better whitening effect, sequence generator b1 is configured to generate pseudo-random sequences or sequences conforming to a Gaussian distribution. Of course, the above is merely an example; sequence generator b1 can also generate other sequences with whitening effects.
[0029] Of course, the above mainly describes the UWB signal receiving link. Furthermore, the problems caused by quantization noise also exist in receiving links where the target signal energy is lower than the quantization noise, and these problems can still be solved using similar approaches.
[0030] Based on this, a second aspect of this application provides a radio frequency signal receiving link that can be applied in receiving scenarios where the target signal energy is lower than the quantization noise. By introducing a whitening module before the analog-to-digital conversion module, the randomness of the signal is enhanced. Therefore, although the analog-to-digital conversion in the subsequent module introduces quantization noise, the correlation of the quantization noise is weakened due to signal whitening. This increases the potential processing gain of subsequent processing modules, making signal processing more favorable for ranging and / or positioning, resulting in better ranging and / or positioning performance. The following will combine... Figures 2 to 10 The radio frequency signal receiving link provided in the embodiments of this application will be described. Among them, Figures 2 to 7 These are schematic diagrams illustrating different structures of the radio frequency signal receiving link provided in the embodiments of this application. Figures 8-10 This diagram illustrates the changes in bit error rate obtained after experiments were conducted on the radio frequency signal receiving link provided in this embodiment and an existing radio frequency signal receiving link.
[0031] In some embodiments, the radio frequency signal receiving link is as follows: Figure 2 As shown, it includes: radio frequency module 100, whitening module 200, analog-to-digital conversion module 300 and processing module 400.
[0032] The radio frequency module 100 is configured to receive and output analog signals via an antenna; the whitening module 200, connected to the radio frequency module 100, is configured to generate an analog whitening signal, and perform whitening processing on the analog signal output by the radio frequency module 100 based on the analog whitening signal before outputting it; the analog-to-digital conversion module 300, connected to the whitening module 200, is configured to perform analog-to-digital conversion on the analog signal output by the whitening module 200 before outputting it; and the processing module 400, connected to the analog-to-digital conversion module 300, is configured to process the digital signal output by the analog-to-digital conversion module 300.
[0033] In this way, in radar mode, after the radio frequency signal receiving link receives the analog signal transmitted from the antenna through the radio frequency module 100, it is sent to the whitening module 200 for whitening processing. Then, the whitened analog signal is sent to the analog-to-digital conversion module 300 for sampling, converted into a digital signal, and sent to the processing module 400 for processing, so as to realize applications such as ranging and / or positioning through digital signal processing.
[0034] It should be noted that the embodiments of this application do not limit the simulated whitening signal, which can be any signal that can achieve the whitening effect. For example, in some embodiments, the simulated whitening signal can be any pseudo-random simulated signal; in other embodiments, the simulated whitening signal can also be any simulated signal that conforms to a Gaussian distribution, etc., which will not be listed here.
[0035] It should also be noted that the embodiments of this application do not limit the structure of the RF module 100, the analog-to-digital conversion module 300, and the processing module 400. They can be implemented using any component or circuit with corresponding functions. For example, the RF module 100 can be implemented using an RF transceiver, the analog-to-digital conversion module 300 can be implemented using an analog-to-digital converter (ADC), the processing module 400 can be implemented using a baseband (BB) circuit, the analog-to-digital conversion module 300 can be implemented using a sampler, and the processing module 400 can be implemented using a baseband (BB) chip or a digital signal processing (DSP) chip, etc., which will not be elaborated here.
[0036] In this embodiment, the generation method of the analog whitening signal is not limited. It can be generated digitally by a DAC (Digital to Analog Converter) or directly in analog form. Regardless of whether it is generated digitally or analogally, the whitening module 200 actually includes two parts: a signal source and a whitening processing submodule. The signal source is used to generate the initial signal, and the whitening processing submodule is configured to use the signal generated by the signal source to whiten the analog signal output by the RF module 100. For ease of understanding, an example is provided below.
[0037] In some embodiments, the whitening module 200, such as Figure 3 The diagram shows a digital signal generator 201, a digital-to-analog converter 202, and a first adder 203 connected in sequence. In this case, the signal source includes the digital signal generator 201, and the whitening processing submodule includes the digital-to-analog converter 202 and the first adder 203 connected in sequence.
[0038] The digital signal generator 201 is configured to generate and output a whitening timing sequence; the digital-to-analog converter 202 is configured to perform digital-to-analog conversion on the whitening timing sequence output by the digital signal generator 201 to obtain an analog whitening signal and output it; the first adder 203 is connected to the radio frequency module 100 and is configured to superimpose the analog whitening signal output by the digital-to-analog converter 202 and the analog signal output by the radio frequency module 100 and output them.
[0039] In other words, the initial whitening signal is generated digitally by the digital signal generator 201, and then converted into an analog signal to obtain an analog whitening signal. Since the signal is generated by the digital signal generator 201, the signal can be controlled more precisely, and the whitening effect is better.
[0040] In some embodiments, such as Figure 4 As shown, the whitening module 200 includes an analog signal generator 204 and a third adder 205 connected in sequence. In this case, the signal source includes the analog signal generator 204, and the whitening processing submodule includes the third adder 205.
[0041] The analog signal generator 204 is configured to generate random analog signals to output an analog whitening signal; the third adder 205 is connected to the radio frequency module 100 and is configured to superimpose and output the analog whitening signal output by the analog signal generator 204 and the analog signal output by the radio frequency module 100.
[0042] In other words, the analog whitening signal is directly generated in analog form by the analog signal generator 204. Since the analog whitening signal is directly generated by the analog signal generator 204, the structure is simple, does not require much space, and has less impact on other modules.
[0043] It is also understandable that the whitening module 200 reduces the correlation of noise, thereby improving the potential processing gain of subsequent processing. However, the whitening module 200 also introduces new signals into the signal, which will affect the signal quality during subsequent signal processing. Therefore, in order not to increase the difficulty of subsequent signal processing, in some embodiments, a denoising module 500 can be added to the RF signal receiving link to remove the signal portion corresponding to the analog whitening noise in the analog-to-digital converted signal, thereby eliminating the adverse effects of whitening. At this time, as... Figure 5 As shown, the analog-to-digital converter 300 is connected to the processing module 400 through the denoising module 500 so that the whitening effect is removed before the signal enters the processing module 400. At the same time, the denoising module is also connected to the whitening module 200 to obtain the opposite signal generated by the whitening module 200 to generate the analog whitening signal, so as to cancel the part of the analog whitening signal in the signal after analog-to-digital conversion, so as to more effectively eliminate the influence of analog whitening noise.
[0044] In some embodiments, with Figure 3 Taking the RF signal receiving link shown in the diagram, further combined with the denoising module 500 as an example, since the signal first passes through the analog-to-digital converter 300 and then through the denoising module 500, the denoising operation of the denoising module 500 occurs in the digital domain. Therefore, as... Figure 6As shown, the denoising module 500 is connected to the digital signal generator 201 and is configured to denoise the digital signal output by the analog-to-digital converter module 300 based on the whitening timing sequence output by the digital signal generator 201. Thus, by connecting the denoising module 500 to the digital signal generator 201, denoising can be directly performed using the digital signal without any additional operations, resulting in a simple structure.
[0045] To facilitate a better understanding of the radio frequency signal receiving link described in the above embodiments by those skilled in the art, the following will be combined with Figure 7 The structure shown is illustrated with an example.
[0046] In some embodiments, such as Figure 7 As shown, the denoising module 500 includes a delay unit 501, a multiplier 502, and a second adder 503 connected in sequence. The delay unit 501 is connected to the digital signal generator 201 and is configured to delay the whitening timing sequence output by the digital signal generator 201 so that the output signal, after passing through the multiplier 502, has the same timing as the digital signal output by the analog-to-digital converter module 300. The multiplier 502 is configured to invert the signal output by the delay unit 501. The second adder 503 is connected to the analog-to-digital converter module 300 and the processing module 400 respectively and is configured to add or sum the digital signal output by the analog-to-digital converter module 300 and the signal output by the multiplier 502.
[0047] The delay unit 501 compensates for the time delay caused by the transmission and processing of the whitened signal portion, ensuring the accuracy of the whitening signal elimination in phase. The multiplier 502 enables the accurate inversion of the whitened signal through a simple structural design, and the second adder 503 further simplifies the elimination of the whitened signal portion with minimal impact on other parts of the circuit and lower costs.
[0048] At this time, based on Figure 7 The radio frequency signal receiving link actually includes: The radio frequency module 100, the first adder 203, the analog-to-digital converter 300, the second adder 503, and the processing module 400 are connected sequentially according to the received signal transmission and processing path. A digital signal generator 201, a delay unit 501, and a multiplier 503 are connected in sequence; the multiplier 502 is connected to the second adder 503; and, The digital-to-analog converter 202 and the digital signal generator 201 are also connected to the first adder 203 through the digital-to-analog converter 202; The first adder 203 is configured to use the analog whitening signal output by the digital-to-analog converter 202 to whiten the received signal output by the radio frequency module 100 and then output it to the input terminal of the analog-to-digital converter 300; the second adder 503 is configured to use the digital whitening signal output by the multiplier 502 after inversion to reduce the digital received signal output by the analog-to-digital converter 300.
[0049] It is evident that the RF signal receiving link provided in this application is conceptually similar to the UWB signal receiving link. The UWB signal receiving link can be considered an implementation of the RF signal receiving link. Both can enhance signal randomness through whitening processing. Although the subsequent analog-to-digital conversion process introduces quantization noise, the correlation of this noise is weakened by signal whitening, thereby increasing the potential processing gain from subsequent processing. This is more beneficial for signal processing and leads to better application results. Furthermore, by reducing the whitened signal, the influence of analog whitening noise is effectively eliminated, resulting in a purer signal and further improving the performance.
[0050] Of course, the above is only an example of the noise reduction module 500, and does not mean that the noise reduction module 500 can only adopt the structure described above. For example, in some embodiments, an inverter can be used to replace the multiplier 502, etc., which will not be elaborated here.
[0051] It should be noted that, as mentioned earlier, since the signal first passes through the analog-to-digital converter 300 and then through the denoising module 500, the denoising operation of the denoising module 500 occurs in the digital domain. And for... Figure 4 The example shown is the direct generation of an analog whitening signal combined with a denoising module 500. Since the whitening module 200 does not generate a digital signal, the denoising module 500 needs to include an additional structure to convert the signal from analog to digital. The rest is the same as... Figure 3 The embodiments shown are largely the same as the noise reduction module 500, so they will not be described in detail here.
[0052] It should also be noted that the above embodiments are mainly described from the perspective of radar mode reception, but this does not mean that the RF signal receiving link only has the above-mentioned modules, the corresponding modules only have the above-mentioned functions, or the corresponding modules only have the above-mentioned connection relationships. For example, in some embodiments, the RF module 100 is also configured to transmit analog signals; in other embodiments, the analog-to-digital conversion module 300 also has a branch connected to the RF module 100 to support communication without whitening processing; and in still other embodiments, the RF signal receiving link also includes an antenna module, that is, the antenna and circuit structure are integrated into one device, etc., which will not be listed here.
[0053] To help those skilled in the art better understand the effect of the radio frequency signal receiving link provided in the embodiments of this application, the following will illustrate it with relevant experimental data.
[0054] In experiments conducted on an RF signal receiving link that includes an RF module, an analog-to-digital converter (ADC), and a processing module, but excludes the whitening module proposed in the embodiments of this application, a binary phase-shift keying (BPSK) modulation scheme was configured for the ultra-wideband signal. The BPSK spreading factor was 128, the quantization step size of the ADC module 300 was configured to 1, and thermal noise with a mean of 0 and Gaussian white noise with a variance of 0.0001 were configured in the environment. At this time, the resulting decoded bit error rate (BER) varies with the signal amplitude as follows: Figure 8 As shown, where, Figure 8 The horizontal axis represents the signal amplitude, and the vertical axis represents the bit error rate. Figure 8 It can be seen that the bit error rate reaches 0.5 before the signal amplitude reaches 0.5, and the decoding result is basically unreliable. Only when the signal amplitude exceeds about 0.5 can the signal be decoded basically correctly, that is, the signal can be detected even with quantization noise. And in some based on Figure 3 In the experiment conducted on the RF signal receiving link shown, the same conditions as in the previous experiment were used. A Gaussian white noise sequence with a mean of 0 and a variance of σ^2 was generated by configuring the digital signal generator in the whitening module. The resulting decoding bit error rate changes with the variance σ^2 of the Gaussian white noise sequence as follows: Figure 9 As shown, where, Figure 9 The horizontal axis represents the variance σ^2 of the Gaussian white noise sequence, and the vertical axis represents the bit error rate. Figure 9 It can be seen that when the variance σ^2 of the added Gaussian white noise sequence is reasonable, even if the amplitude of the useful signal is much lower than the quantization noise, the useful signal can still be successfully demodulated by spreading gain. For example, when the variance σ^2 of the Gaussian white noise sequence is 0.2, the bit error rate is less than 10^(-4), which means that the basic decoding is correct and is not affected by the signal amplitude.
[0055] And in some based on Figure 7 In the experiment conducted on the RF signal receiving link shown, the same conditions as in the previous experiment were used. A Gaussian white noise sequence with a mean of 0 and a variance of σ^2 was generated by configuring the digital signal generator in the whitening module. The resulting decoding bit error rate changes with the variance σ^2 of the Gaussian white noise sequence as follows: Figure 10 As shown, where, Figure 10The horizontal axis represents the variance σ^2 of the Gaussian white noise sequence, and the vertical axis represents the bit error rate. Figure 10 It can be seen that the variance range of the Gaussian white noise sequence that can be used for basic correct decoding is wider. For example, Figure 9 Even with σ²=1, a medium Gaussian white noise sequence still exhibits a bit error rate greater than 10⁻³, but in… Figure 10 The error rate was further reduced to below 10^(-4).
[0056] Therefore, the experimental results above show that introducing a whitening module into the RF signal receiving link effectively whitens the quantization noise generated after the signal enters the analog-to-digital conversion module, significantly improving the signal processing gain (such as despreading) in subsequent processing modules. If a denoising module is further introduced, the additional sequence is removed on the digital side to improve processing gain and ensure the demodulation sensitivity of the signal.
[0057] This application also provides a signal processing method, such as... Figure 11 As shown, it includes the following steps: Step 1101: Receive the analog signal and generate the analog whitening signal.
[0058] Step 1102: Perform whitening processing on the received analog signal based on the analog whitening signal.
[0059] Step 1103: Perform analog-to-digital conversion on the whitened signal.
[0060] In this way, by introducing whitening processing before the analog-to-digital conversion module, the randomness of the signal is enhanced. Therefore, although the subsequent analog-to-digital conversion will introduce quantization noise, the correlation of the quantization noise will be weakened due to the whitening of the signal. This increases the potential processing gain brought by subsequent processing, which is more conducive to signal processing for ranging and / or positioning, and can achieve better ranging and / or positioning results.
[0061] The steps of the various methods described above are only for clarity. In practice, they can be combined into one step or some steps can be split into multiple steps. As long as they include the same logical relationship, they are all within the scope of protection of this patent. Adding insignificant modifications or introducing insignificant designs to the algorithm or process, but without changing the core design of the algorithm and process, are also within the scope of protection of this patent.
[0062] It is not difficult to see that this embodiment is a method embodiment corresponding to the link embodiment, and this embodiment can be implemented in conjunction with the link embodiment. The relevant technical details mentioned in the link embodiment are still valid in this embodiment, and will not be repeated here to reduce repetition. Accordingly, the relevant technical details mentioned in this embodiment can also be applied to the link embodiment.
[0063] This application also provides a chip, including: a UWB signal receiving link as described in any of the preceding embodiments, or a radio frequency signal receiving link as described in any of the preceding embodiments.
[0064] It is not difficult to see that this embodiment is a chip embodiment corresponding to the link embodiment, and this embodiment can be implemented in conjunction with the link embodiment. The relevant technical details mentioned in the link embodiment are still valid in this embodiment, and will not be repeated here to reduce repetition. Correspondingly, the relevant technical details mentioned in this embodiment can also be applied to the link embodiment.
[0065] This application also provides an electronic device, including: a carrier, a signal receiving link disposed on the carrier, and an antenna disposed on the carrier, or the antenna and signal receiving link integrated into a single device disposed on the carrier. The signal receiving link is connected to the antenna and is used to process the echo signal received by the antenna. The signal receiving link is the UWB signal receiving link or radio frequency signal receiving link provided in the foregoing embodiments.
[0066] When the antenna and signal receiving link are not integrated into a single device, the signal receiving link is connected to the antenna via a first transmission line, which can be a printed circuit board (PCB) trace. The carrier can be a printed circuit board (PCB), such as a development board, data acquisition board, or the motherboard of a device, etc., which will not be elaborated on here.
[0067] Since the structure and working principle of the signal receiving link included in the electronic device have been described in detail in the above embodiments, they will not be repeated here.
[0068] Furthermore, the electronic device in this application embodiment may also include a signal transmission link in addition to the signal receiving link. In this case, the signal receiving link and the signal transmission link can be integrated into a single device, or the signal transmission link and the antenna can be integrated into a single device, or the signal transmission link and the antenna can be integrated into a single device, etc.
[0069] This application also provides a terminal device, which may include: a device body; and electronic devices as described above disposed on the device body; wherein the electronic devices are used for target detection and / or communication to provide reference information to the operation of the device body. In some embodiments, the electronic device may be disposed outside the device body; in other embodiments, the electronic device may be disposed inside the device body; and in still other embodiments, the electronic device may be partially disposed inside the device body and partially disposed outside the device body. This application does not limit the scope of the embodiments; the specific arrangement depends on the circumstances.
[0070] It should be noted that electronic devices can achieve functions such as target detection by transmitting and receiving radio signals, providing measurement information of the detected target to the device itself, thereby assisting or even controlling the operation of the device. Examples of measurement information include at least one of relative distance, relative speed, and relative angle.
[0071] In some embodiments, the device body described above can be a component or product applied in fields such as transportation, consumer electronics, monitoring, in-cabin detection, and healthcare. For example, the device body can be intelligent transportation equipment (such as automobiles, motorcycles, ships, subways, trains, etc.), digital keys, security equipment (such as cameras), liquid level / flow rate detection equipment, smart wearable devices (such as wristbands, glasses, etc.), smart home devices (such as robot vacuum cleaners, door locks, televisions, air conditioners, smart lights, etc.), various communication devices (such as mobile phones, tablets, etc.), as well as devices such as barriers, intelligent traffic lights, intelligent signs, traffic cameras, and various industrial robotic arms (or robots). It can also be various instruments used to detect vital signs parameters and various devices equipped with such instruments, such as in-cabin detection in automobiles, indoor personnel monitoring, intelligent medical devices, and consumer electronic devices.
[0072] In some embodiments, when the aforementioned device body is applied to an Advanced Driving Assistance System (ADAS), the electronic devices, as on-board sensors, can provide various functional safety guarantees for the ADAS system, such as Automatic Emergency Braking (AEB), Blind Spot Detection (BSD), Lane Changing Assist (LCA), and Rear CrossTraffic Alert (RCTA).
[0073] Furthermore, the examples mentioned in the above embodiments can be freely combined, and any combination can be understood as an embodiment. The terms "embodiment" or "example" appearing in various locations in the specification do not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art will understand that the embodiments described herein can be combined with other embodiments.
[0074] Those skilled in the art will understand that the above embodiments are specific embodiments for implementing this application, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of this application.
Claims
1. A UWB signal receiving link, characterized in that, include: The radio frequency signal receiver, the first adder, the analog-to-digital converter, the second adder, and the baseband processor are connected sequentially according to the received signal transmission and processing path. A sequence generator, a delay unit, and a multiplier are connected in sequence, the multiplier being connected to the second adder; and, A digital-to-analog converter, wherein the sequence generator is also connected to the first adder via the digital-to-analog converter; The first adder is configured to use the analog whitening signal output by the digital-to-analog converter to whiten the received signal output by the radio frequency signal receiver and then output it to the input of the analog-to-digital converter; the second adder is configured to use the digital whitening signal output by the multiplier after inversion to reduce the digital received signal output by the analog-to-digital converter.
2. The UWB signal receiving link according to claim 1, characterized in that, The sequence generator is configured to generate pseudo-random sequences or sequences that conform to a Gaussian distribution.
3. A radio frequency signal receiving link, characterized in that, include: The radio frequency module is configured to receive and output analog signals; The whitening module, connected to the radio frequency module, is configured to generate a simulated whitening signal, and to perform whitening processing on the simulated signal output by the radio frequency module based on the simulated whitening signal and then output it. An analog-to-digital conversion module, connected to the whitening module, is configured to perform analog-to-digital conversion on the analog signal output by the whitening module and then output the signal. The processing module, connected to the analog-to-digital converter module, is configured to process the digital signal output by the analog-to-digital converter module.
4. The radio frequency signal receiving link according to claim 3, characterized in that, The whitening module includes a signal source and a whitening processing submodule connected in sequence. The whitening processing submodule is configured to use the signal generated by the signal source to perform whitening processing on the analog signal output by the radio frequency module.
5. The radio frequency signal receiving link according to claim 4, characterized in that, The signal source includes a digital signal generator, and the whitening processing submodule includes a digital-to-analog converter and a first adder connected in sequence. The digital signal generator is configured to generate and output a whitening timing sequence; The digital-to-analog converter is configured to perform digital-to-analog conversion on the whitening timing sequence output by the digital signal generator to obtain the analog whitening signal, and then output it. The first adder, connected to the radio frequency module, is configured to superimpose and output the analog whitening signal output by the digital-to-analog converter and the analog signal output by the radio frequency module.
6. The radio frequency signal receiving link according to claim 5, characterized in that, The radio frequency signal receiving link further includes a denoising module. The analog-to-digital conversion module and the processing module are connected through the denoising module. The denoising module is connected to the digital signal generator and is configured to perform denoising processing on the digital signal output by the analog-to-digital conversion module according to the whitening timing sequence output by the digital signal generator.
7. The radio frequency signal receiving link according to claim 6, characterized in that, The noise reduction module includes a delay unit, a multiplier, and a second adder connected in sequence. The delay unit, connected to the digital signal generator, is configured to delay the whitened timing sequence output by the digital signal generator so that the output signal, after passing through the multiplier, has the same timing as the digital signal output by the analog-to-digital converter module. The multiplier is configured to invert the signal output by the delay unit; The second adder is connected to the analog-to-digital conversion module and the processing module respectively, and is configured to superimpose the digital signal output by the analog-to-digital conversion module and the signal output by the multiplier.
8. The radio frequency signal receiving link according to claim 4, characterized in that, The signal source includes an analog signal generator, and the whitening processing submodule includes a third adder; The analog signal generator is configured to generate random analog signals to output the analog whitening signal; The third adder, connected to the radio frequency module, is configured to superimpose and output the analog whitening signal output by the analog signal generator and the analog signal output by the radio frequency module.
9. The radio frequency signal receiving link according to any one of claims 3 to 8, characterized in that, The simulated whitening signal includes a pseudo-random simulated signal or a simulated signal that conforms to a Gaussian distribution.
10. A chip, characterized in that, include: The UWB signal receiving link as described in claim 1 or 2, or the radio frequency signal receiving link as described in any one of claims 3 to 9.
11. An electronic device, characterized in that, include: Carrier; A signal receiving link, wherein the signal receiving link is the UWB signal receiving link as described in claim 1 or 2, or the radio frequency signal receiving link as described in any one of claims 3 to 9, is disposed on the carrier; An antenna is mounted on the carrier, or the antenna and the circuit are integrated into a single device mounted on the carrier. The signal receiving link is connected to the antenna and is used to receive radio frequency signals.
12. A terminal device, characterized in that, include: Equipment body; And the electronic device as described in claim 11 disposed on the device body; The electronic devices are used for target detection and / or communication to provide reference information for the operation of the device body.
13. A signal processing method, characterized in that, include: Receives analog signals and generates analog whitening signals; Based on the simulated whitening signal, the received simulated signal is subjected to whitening processing; The whitened signal is then converted from analog to digital.