Wireless network device and radar transmission method applying the same
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- REALTEK SEMICON CORP
- Filing Date
- 2025-02-05
- Publication Date
- 2026-08-07
AI Technical Summary
然而，这种方式需要在雷达装置的模拟端设置额外的相关模拟电路才能处理雷达信号的模拟解调，导致模拟电路硬件成本增加
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Figure CN122533672A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to a wireless network device, and more particularly to a wireless network device for radar detection. Existing technology
[0002] With the rapid development of technology, targets can be detected using radio waves (i.e., radar). Currently, most radar devices use the traditional method of analog demodulation to process radar reflection signals. This means extracting information such as the target's distance, azimuth, or speed from the radar reflection signal at the analog end before the analog-to-digital converter (ADC). However, this method requires additional analog circuitry at the analog end of the radar device to process the analog demodulation of the radar signal, leading to increased hardware costs for the analog circuitry.
[0003] Furthermore, instability in the radar device's circuitry can also affect its ability to detect targets. For example, poor signal isolation between the transmitter and receiver may cause signal energy to leak from the transmitter to the receiver, thus affecting the receiver's signal reception performance. Alternatively, prolonged signal transmission can cause temperature variations in the radar device, and switching between various operating modes such as transmission, reception, and standby can all lead to unstable fluctuations in the energy of the transmitter signal, the delay, phase, and amplitude of the receiver signal, affecting the radar device's ability to detect targets and consequently impacting the overall performance of the radar system.
[0004] Furthermore, there is already a growing trend of connecting WiFi devices to access points (APs). Therefore, integrating radar functionality into WiFi devices to demodulate radar reflection signals without increasing the cost of analog circuitry hardware, in order to solve the aforementioned technical problems, is a goal that the industry urgently needs to address. Summary of the Invention
[0005] One objective of this disclosure is to provide a wireless network apparatus comprising a signal processing circuit, a transmission circuit, and a receiving circuit. The signal processing circuit includes a signal generator for generating an output signal, wherein, in radar transmission operation, the output signal includes multiple correction chirps in a radar frame. The transmission circuit converts the output signal into a wireless transmission signal. The receiving circuit receives and converts a wireless reflection signal corresponding to the wireless transmission signal into an input signal. The signal processing circuit also includes a correction circuit for setting an input signal corresponding to a reference frame as a reference frame signal and comparing the input signal and the reference frame signal to adjust the signal generator and the correction circuit. The signal generator is also used to generate multiple measurement chirps in the radar frame, such that the signal processing circuit generates multiple radar reflection information based on the input signals corresponding to the multiple measurement chirps.
[0006] In one embodiment, the correction circuit includes: an energy correction unit, configured to calculate an energy deviation based on the energy difference between the input signal and the reference frame signal and a predicted energy difference, and the energy correction unit generates and transmits a control signal to the signal generator based on the energy deviation; wherein the signal generator further adjusts the output signal to a compensated output signal based on the control signal, and the energy correction unit further outputs an energy correction signal based on the input signal corresponding to the compensated output signal.
[0007] In one embodiment, the correction circuit further includes: a delay correction unit coupled to the energy correction unit, for calculating a delay deviation based on the reception time of the energy correction signal and the expected reception time of the reference frame signal, and the delay correction unit adjusting the energy correction signal into a delay correction signal according to the delay deviation.
[0008] In one embodiment, the correction circuit further includes: a phase and amplitude correction unit coupled to the delay correction unit, and configured to calculate a phase deviation based on the phase value of the delay correction signal and the reference phase value of the reference frame signal, and to calculate an amplitude deviation based on the amplitude value of the delay correction signal and the reference amplitude value of the reference frame signal, so as to adjust the delay correction signal into a correction signal according to the phase deviation and the amplitude deviation.
[0009] In one embodiment, the signal processing circuit further includes a measurement circuit coupled to the phase and amplitude correction unit and used to analyze the corrected signal to obtain the radar reflection information.
[0010] In one embodiment, the correction signal includes these measurement chirps in the radar frame.
[0011] In one embodiment, the signal processing circuit sets the initial radar frame in the time slot as the reference frame.
[0012] In one embodiment, the signal processing circuit further includes a storage circuit coupled to the correction circuit and used to record multiple parameters of the reference frame, including a reference energy value, an expected reception time, a reference phase value, and a reference amplitude value.
[0013] In one embodiment, the signal processing circuit performs the radar transmission operation and the wireless network transmission operation in different multiple time slots respectively; during the radar transmission operation, the output signal is in a first frequency band; during the wireless network transmission operation, the output signal is in a second frequency band, the first frequency band being different from the second frequency band.
[0014] Another object of this disclosure is to provide a radar transmission method for a wireless network device, the radar transmission method comprising: generating an output signal, wherein in radar transmission operation, the output signal includes a plurality of correction chirps in a radar frame; converting the output signal into a wireless transmission signal; converting a wireless reflection signal corresponding to the wireless transmission signal into an input signal; setting an input signal corresponding to a reference frame as a reference frame signal; comparing the input signal and the reference frame signal to generate a plurality of measurement chirps in the radar frame; and generating a plurality of radar reflection information based on the input signals corresponding to the plurality of measurement chirps.
[0015] Therefore, the wireless network device of this disclosure integrates radar functionality to perform radar transmission and WiFi transmission operations, and performs digital demodulation of the input signal at the digital end of the wireless network device (i.e., the signal processing circuit after the communication connection to the receiving circuit) to reduce the hardware cost of analog circuits, and can reduce the signal energy at the transmitting end, the signal delay at the receiving end, and the deviation changes in phase and amplitude, thereby improving the overall performance of the wireless network device.
[0016] The following detailed description of the technical features and implementation methods of this disclosure is illustrated with reference to the accompanying drawings, enabling those skilled in the art to understand the technical features of the claimed invention. Attached Figure Description
[0017] To make the above and other objects, features and embodiments of this disclosure more apparent and understandable, the accompanying drawings are described below:
[0018] Figure 1 This is a block diagram of a wireless network device according to one embodiment of the present disclosure.
[0019] Figure 2 for Figure 1 A schematic diagram of the output signal transmission of the signal processing circuit in radar transmission operation and wireless network transmission operation.
[0020] Figure 3A for Figure 1 A functional block diagram of the signal processing circuit;
[0021] Figure 3B For use Figure 1 Radar transmission method for wireless network devices; and
[0022] Figure 4 This is a schematic diagram of the radar frame architecture for the output signal. Detailed Implementation
[0023] The following disclosure provides numerous different embodiments or examples for implementing various features of this disclosure. Elements and configurations in particular examples are used in the following discussion to simplify this disclosure. Any examples discussed are for illustrative purposes only and do not in any way limit the scope or meaning of this disclosure or its examples. Where appropriate, the same reference numerals are used between the drawings and in the corresponding text description to represent the same or similar elements.
[0024] Currently, most radar devices perform analog demodulation of radar reflection signals at the analog end before the analog-to-digital converter (ADC), resulting in high hardware costs for analog circuitry. Furthermore, the inherent instability of the radar device's circuitry causes deviations in signal energy at the transmitting end, signal delay at the receiving end, phase, and amplitude, affecting the radar's target detection. In addition, there is a growing trend of connecting wireless network (WiFi) devices to access points (APs). Therefore, this disclosure proposes a WiFi device integrating radar functionality for both radar and WiFi transmission operations. It performs digital demodulation of the radar reflection signal at the digital end of the WiFi device to reduce analog circuitry hardware costs and minimize deviations in signal energy at the transmitting end, signal delay at the receiving end, phase, and amplitude, thereby improving the overall performance of the WiFi device.
[0025] Please see Figure 1 This is a block diagram of a wireless network (WiFi) device 100 according to one embodiment of this disclosure. Figure 1 As shown, the WiFi device 100 includes a signal processing circuit 110, a transmission circuit 120, a receiving circuit 130, and an oscillation circuit 140. In one embodiment, the WiFi device 100 may be a radio frequency (RF) front-end module for wireless communication devices such as smartphones, base stations, and satellites, and may be used for radar transmission operations and wireless network (WiFi) transmission operations, but this disclosure is not limited thereto.
[0026] In one embodiment, the signal processing circuit 110 may be a baseband processor (BP) and may be used to generate digital signals (e.g., Figure 1 The output signal Rout), but this disclosure is not limited to this. Please refer to Figure 2 , it is Figure 1 The signal processing circuit 110 is shown in the schematic diagram of the output signal Rout transmission in radar transmission operation and WiFi transmission operation. (See diagram for reference.) Figures 1 to 2 As shown, the signal processing circuit 110 performs radar transmission operations and WiFi transmission operations in different time slots RS1-RS2 and WS1-WS2, respectively. During radar transmission operations, as... Figure 2 As shown, the output signal Rout is in the first frequency band RH. During WiFi transmission operation, as... Figure 2 As shown, the output signal Rout is in the second frequency band WH. In one embodiment, the first frequency band RH is different from the second frequency band WH; for example, the first frequency band RH may be 5 GHz and the second frequency band WH may be 2.4 GHz, but this disclosure is not limited thereto. It should be understood that the number of time slots for radar transmission operations and WiFi transmission operations is not limited to two.
[0027] In one embodiment, such as Figure 2 As shown, the signal processing circuit 110 sets the initial radar frame in the multiple radar frames RF of each time slot (e.g., RS1) as the reference frame RFS. The initial radar frame is the radar frame RF initially generated by the signal processing circuit 110. For details on the specific operation of the radar frame RF and the reference frame RFS, please refer to the following text. Figure 3A , Figure 3B and Figure 4 The discussion.
[0028] Therefore, by using different frequency bands and different time slots to perform radar transmission and WiFi transmission operations, the WiFi device 100 can reduce signal interference between radar transmission and WiFi transmission, and improve the overall performance of the WiFi device 100 when performing radar ranging.
[0029] Back Figure 1 The transmission circuit 120 is coupled to the signal processing circuit 110 and includes a digital-to-analog converter (DAC) 122, a transmission processing circuit 124, and a transmitter Tx. In one embodiment, such as Figure 1 As shown, DAC 122 is coupled to signal processing circuit 110 and performs digital-to-analog conversion on the output signal Rout. Transmission processing circuit 124 is coupled to DAC 122 and performs signal conversion from analog to wireless communication format. Transmitter Tx is coupled to transmission processing circuit 124 and transmits wireless transmission signal Wt.
[0030] Specifically, in one embodiment, such as Figure 1 As shown, the transmission processing circuit 124 may consist of a filter 124A, a mixer 124B, and a power amplifier PA connected in series. The filter 124A is coupled to the DAC 122 and is used to filter noise from the transmitted signal Aout. The mixer 124B is coupled to the filter 124A and the oscillator circuit 140 and is used to add the frequency of the output signal from the oscillator circuit 140 to the frequency of the transmitted signal Aout to generate a reasonable frequency range, thereby adjusting the frequency of the transmitted signal Aout to a reasonable frequency range. The power amplifier PA is used to amplify the transmitted signal Aout. In one embodiment, the oscillator circuit 140 may be a voltage-controlled oscillator (VCO), and the transmitting end Tx may be an antenna, but this disclosure is not limited thereto. In one embodiment, the transmitted signal Aout may be an analog signal, and the wireless transmission signal Wt may be a radio frequency signal, but this disclosure is not limited thereto.
[0031] like Figure 1 As shown, the receiving circuit 130 is coupled to the signal processing circuit 110 and includes a receiving processing circuit 132, an analog-to-digital converter (ADC) 134, and a receiving terminal Rx. In one embodiment, as... Figure 1 As shown, the receiver Rx receives the wireless reflected signal Wr generated after the wireless transmission signal Wt is reflected by the test object 200. The receiving processing circuit 132 is coupled to the receiver Rx and converts the wireless reflected signal Wr from wireless communication form to analog form. The ADC 134 is coupled to the receiving processing circuit 132 and performs analog-to-digital conversion on the received signal Ain. In one embodiment, as... Figure 1 As shown, the receiving processing circuit 132 can be composed of a low-noise amplifier (LNA), a mixer 132A, an amplifier 132B, and a filter 132C connected in series. The low-noise amplifier (LNA) is coupled to the receiver Rx and is used to amplify and reduce noise in the wireless reflected signal Wr. The mixer 132A is coupled to the low-noise amplifier (LNA) and the oscillator circuit 140 and is used to add the frequency of the output signal from the oscillator circuit 140 to the frequency of the wireless reflected signal Wr to generate a reasonable frequency range, thereby adjusting the frequency of the wireless reflected signal Wr to a reasonable frequency range. The amplifier 132B is coupled to the mixer 132A and is used to amplify the wireless reflected signal Wr. The filter 132C is coupled to the amplifier 132B and is used to filter noise in the wireless reflected signal Wr. In one embodiment, the receiver Rx can be an antenna, but this disclosure is not limited to this. In one embodiment, as... Figure 1As shown, the object under test 200 can be a dynamic object or a static object (e.g., a person, cat, dog, tree, or rock), but this disclosure is not limited thereto. In one embodiment, the wireless reflected signal Wr can be a radio frequency signal, the received signal Ain can be an analog signal, and the input signal Rin can be a digital signal, but this disclosure is not limited thereto.
[0032] Therefore, the signal processing circuit 110 receives and generates multiple radar reflection information RIs based on the input signal Rin. In one embodiment, the radar reflection information RIs may be the relative position, relative distance, relative orientation, or relative speed of the object under test 200 relative to the WiFi device 100, but this disclosure is not limited thereto. For a detailed explanation of the specific functional operation of the signal processing circuit 110 in generating radar reflection information RIs based on the input signal Rin, please refer to the following text. Figure 3A and Figure 3B The discussion.
[0033] Please see Figure 3A , it is Figure 1 A functional block diagram of the signal processing circuit 110. (See diagram below.) Figure 3A As shown, the signal processing circuit 110 includes a signal generator 112, a correction circuit 114, a measurement circuit 116, and a storage circuit 118. In one embodiment, the signal generator 112, the correction circuit 114, the measurement circuit 116, and the storage circuit 118 may be partially or individually disposed outside the signal processing circuit 110, but this disclosure is not limited thereto.
[0034] It should be noted that the signal generator 112 can be an arbitrary waveform generator (AWG), a function signal generator, or a radio frequency microwave signal generator; the correction circuit 114 can be a power factor correction circuit (PFC); the measurement circuit 116 can be an oscilloscope; and the storage circuit 118 can be memory, a Universal Serial Bus (USB) flash drive, a hard disk, an optical disk, a portable hard disk, or any other storage medium or circuit with the same function known to those skilled in the art to which this disclosure pertains, but this disclosure is not limited thereto.
[0035] like Figure 3A As shown, signal generator 112 is used to generate the output signal Rout. See also... Figure 4 , it is Figure 2 and Figure 3A A schematic diagram of the radar frame RF architecture for the output signal Rout. (See diagram for example.) Figure 4 As shown, in radar transmission operation, Figure 2 and Figure 3AThe output signal Rout includes multiple correction chirps CC in the radar frame RF, and the multiple correction chirps CC are adjusted into multiple measurement chirps MC after compensation and correction by the correction circuit 114. In one embodiment, the signal generator 112 is used to generate multiple measurement chirps MC in the radar frame RF, such that the signal processing circuit 110 generates multiple radar reflection information RI according to the input signal Rin corresponding to these measurement chirps MC.
[0036] like Figure 3A As shown, the correction circuit 114 is coupled to the signal generator 112 and includes an energy correction unit 114A, a delay correction unit 114B, and a phase and amplitude correction unit 114C. In one embodiment, the energy correction unit 114A, the delay correction unit 114B, and the phase and amplitude correction unit 114C may be partially or individually disposed within the signal processing circuit 110 outside the correction circuit 114, or may be partially or individually disposed outside the signal processing circuit 110, but this disclosure is not limited thereto.
[0037] Specifically, such as Figure 3A As shown, the energy correction unit 114A calculates the energy deviation based on the input signal Rin and the reference frame signal, and generates a control signal CS corresponding to the energy deviation. Therefore, the signal generator 112 compensates the output signal Rout for the energy deviation based on the control signal CS from the energy correction unit 114A, changing it to a compensated output signal Rout', such that the energy correction unit 114A uses the input signal Rin corresponding to the compensated output signal Rout' as the energy correction signal RP. In one embodiment, the reference frame signal may be the input signal Rin corresponding to the reference frame RFS, but this disclosure is not limited to this.
[0038] like Figure 3A As shown, the delay correction unit 114B is coupled to the energy correction unit 114A and is used to calculate the delay deviation based on the energy correction signal RP and the reference frame signal, so as to compensate the delay deviation to the energy correction signal RP, thereby changing the energy correction signal RP into the delay correction signal RD.
[0039] like Figure 3A As shown, the phase and amplitude correction unit 114C is coupled to the delay correction unit 114B and is used to calculate the phase deviation based on the delay correction signal RD and the reference frame signal, and to calculate the amplitude deviation based on the delay correction signal RD and the reference frame signal, so as to compensate the phase deviation and amplitude deviation to the delay correction signal RD, thereby changing the delay correction signal RD into the correction signal RC.
[0040] Therefore, the correction circuit 114 corrects the input signal Rin to the correction signal RC based on the reference frame signal, so as to adjust the correction chirp CC to the measurement chirp MC.
[0041] In one embodiment, such as Figure 3A As shown, the storage circuit 118 is coupled to the correction circuit 114 and is used to record multiple parameters of the reference frame RFS. In one embodiment, these parameters include a reference energy value, an expected reception time, a reference phase value, and a reference amplitude value, but this disclosure is not limited thereto. In one embodiment, the correction circuit 114 is used to determine whether the storage circuit 118 stores these parameters of the reference frame RFS, so as to set the input signal Rin corresponding to the reference frame RFS as the reference frame signal. For example, if the storage circuit 118 does not store the reference phase value and the reference amplitude value of the reference frame RFS, the correction circuit 114 sets the input signal Rin corresponding to the reference frame RFS as the reference frame signal, so as to store the phase value and amplitude value of the input signal Rin as the reference phase value and the reference amplitude value in the storage circuit 118, and replace the reference energy value and the expected reception time originally stored in the storage circuit 118 with the energy value and reception time of the input signal Rin.
[0042] like Figure 3A As shown, the measurement circuit 116 is coupled to the phase and amplitude correction unit 114C and is used to obtain the radar reflection information RI based on the correction signal RC.
[0043] Therefore, through Figure 3A With the above-mentioned function of the signal processing circuit 110, the WiFi device 100 can first perform signal correction processing on the received input signal Rin, so as to obtain accurate radar reflection information RI based on the corrected signal (i.e., the correction signal RC).
[0044] Please see Figure 3B , it is used for Figure 1 Radar transmission method 300 for WiFi device 100.
[0045] First, such as Figure 1 and Figure 3B As shown, in step S310, the signal processing circuit 110 generates the output signal Rout. Specifically, in step S310, the signal processing circuit 110 generates the output signal Rout through the signal generator 112. In one embodiment of step S310, as... Figure 2 As shown, the output signal Rout is transmitted in multiple radar frames RF in time slots RS1-RS2 (i.e., the time period from time t1 to time t2 and the time period from time t3 to time t4), and in multiple wireless network (WiFi) data packets WP in time slots WS1-WS2 (i.e., the time period from time t0 to time t1 and the time period from time t2 to time t3).
[0046] After that, as Figure 1 and Figure 3B As shown, in step S320, the transmission circuit 120 converts the output signal Rout into a wireless transmission signal Wt. Specifically, in step S320, the DAC 122 converts the output signal Rout from digital form into an analog transmission signal Aout, and the transmission processing circuit 124 converts the transmission signal Aout from analog form into a wireless communication form wireless transmission signal Wt, so as to transmit the wireless transmission signal Wt through the transmitter Tx. In one embodiment of step S320, the transmission signal Aout is converted into the wireless transmission signal Wt after noise filtering by the filter 124A, frequency adjustment by the mixer 124B, and signal amplification by the power amplifier PA.
[0047] After that, as Figure 1 and Figure 3B As shown, in step S330, the receiving circuit 130 receives and converts the wireless reflected signal Wr corresponding to the wireless transmitted signal Wt into an input signal Rin. Specifically, in step S330, the receiving processing circuit 132 receives the wireless reflected signal Wr through the receiving terminal Rx and converts the wireless reflected signal Wr from wireless communication form into an analog received signal Ain. The ADC 134 converts the received signal Ain from analog form into a digital input signal Rin, and transmits the input signal Rin to the signal processing circuit 110. In one embodiment of step S330, the wireless reflected signal Wr is converted into the received signal Ain after being amplified and denoised by the low-noise amplifier LNA, frequency adjusted by the mixer 132A, signal amplified by the amplifier 132B, and noise filtered by the filter 132C.
[0048] After that, as Figure 3B As shown, in step S340, the signal processing circuit 110 sets the reference frame RFS as the reference frame signal. Specifically, in step S340, the correction circuit 114 sets the input signal Rin corresponding to the reference frame RFS as the reference frame signal. For example, as... Figure 2 As shown, when the signal processing circuit 110 performs radar transmission operation in time slot RS1, the correction circuit 114 sets the radar frame RF transmitted for the first time in time slot RS1 as the reference frame signal.
[0049] After that, as Figure 3B As shown, in step S350, the signal processing circuit 110 compares the input signal Rin and the reference frame signal to generate multiple measurement chirps MC in the radar frame RF. Specifically, in step S350, the correction circuit 114 compares the input signal Rin and the reference frame signal to adjust the signal generator 112 and the correction circuit 114 so that the signal generator 112 generates multiple measurement chirps MC in the radar frame RF.
[0050] In one embodiment of step S350, the energy correction unit 114A is used to calculate the energy deviation based on the energy difference between the input signal Rin and the reference frame signal and the expected energy difference. The energy correction unit 114A generates and transmits a control signal CS to the signal generator 112 according to the energy deviation. Therefore, the signal generator 112 adjusts the output signal Rout to the compensated output signal Rout' according to the control signal CS. The energy correction unit 114A outputs the energy correction signal RP according to the input signal Rin of the corresponding compensated output signal Rout'. For example, if the signal energy of the output signal Rout is 10dB, and the received input signal Rin is expected to have 8dB of signal energy (i.e., the expected energy difference is 2dB), but the energy correction unit 114A actually receives an input signal Rin with only 7.5dB of signal energy (i.e., the energy difference is 2.5dB), then the energy correction unit 114A notifies the signal generator 112 of a 0.5dB energy deviation through the control signal CS, so that the signal generator 112 compensates for the 0.5dB energy deviation to the output signal Rout, so that the output signal Rout is adjusted to a compensated output signal Rout' with 10.5dB of signal energy. The signal energy of the input signal Rin changes accordingly to 8dB due to the energy adjustment of the output signal Rout, so that the energy correction unit 114A uses the input signal Rin with a signal energy of 8dB as the energy correction signal RP.
[0051] In one embodiment of step S350, the delay correction unit 114B calculates the delay deviation based on the reception time of the energy correction signal RP and the expected reception time of the reference frame signal, and adjusts the energy correction signal RP to a delay correction signal RD according to the delay deviation. In one embodiment, the reception time of the energy correction signal RP may be the actual time when the delay correction unit 114B receives the energy correction signal RP, and the expected reception time of the reference frame signal may be the expected time when the delay correction unit 114B receives the energy correction signal RP, but this disclosure is not limited thereto. For example, if the expected reception time of the reference frame signal is 2s, and the reception time of the energy correction signal RP is 2.2s, then the delay correction unit 114B adjusts the energy correction signal RP to a delay correction signal RD with a reception time of 2s.
[0052] In one embodiment of step S350, the phase and amplitude correction unit 114C is used to calculate the phase deviation based on the phase value of the delay correction signal RD and the reference phase value of the reference frame signal, and to calculate the amplitude deviation based on the amplitude value of the delay correction signal RD and the reference amplitude value of the reference frame signal, so as to adjust the delay correction signal RD into a correction signal RC according to the phase deviation and amplitude deviation. In one embodiment, such as Figure 4As shown, the correction signal RC includes multiple measurement chirps MC in the radar frame RF. In one embodiment, the reference phase value of the reference frame signal may be the predicted phase value of the delay correction signal RD, and the reference amplitude value of the reference frame signal may be the predicted amplitude value of the delay correction signal RD, but this disclosure is not limited thereto. For example, if the reference phase value and reference amplitude value of the reference frame signal are respectively... And 1 volt, while the phase and amplitude values of the delay correction signal RD are respectively And 0.95 volt, then the phase and amplitude correction unit 114C compensates. The phase deviation and 0.05 volt amplitude deviation are fed into the delay correction signal RD to adjust the delay correction signal RD to a phase value of And a correction signal RC with an amplitude of 1 volt.
[0053] After that, as Figure 3B As shown, in step S360, the signal processing circuit 110 generates multiple radar reflection information RIs based on the input signals Rin corresponding to these measured chirps MC. Specifically, in step S360, the measurement circuit 116 analyzes the correction signal RC to obtain these radar reflection information RIs.
[0054] Therefore, as can be seen from the above embodiments, the WiFi device 100 of this disclosure integrates radar function to perform radar transmission operation and WiFi transmission operation, and performs digital demodulation of the input signal Rin at the digital end of the WiFi device 100 (i.e., the signal processing circuit 110 after the receiving circuit 130), so as to reduce the hardware cost of analog circuits and reduce the signal energy at the transmitting end, the signal delay at the receiving end, and the deviation changes in phase and amplitude, thereby improving the overall performance of the WiFi device 100.
[0055] Although this disclosure has been described above with reference to embodiments, it is not intended to limit this disclosure. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure. Therefore, the scope of protection of this disclosure shall be determined by the scope defined in the appended claims.
[0056] Symbol Explanation
[0057] 100: Wireless Network Device
[0058] 110: Signal processing circuit
[0059] 112: Signal Generator
[0060] 114: Correction Circuit
[0061] 114A: Energy Correction Unit
[0062] 114B: Delay Correction Unit
[0063] 114C: Phase and Amplitude Correction Unit
[0064] 116: Measurement Circuit
[0065] 118: Storage Circuit
[0066] 120: Transmission circuit
[0067] 122: Digital-to-Analog Converter
[0068] 124: Transmission Processing Circuit
[0069] 124A, 132C: Filters
[0070] 124B, 132A: Mixers
[0071] 132B: Amplifier
[0072] 130: Receiver circuit
[0073] 132: Receiver processing circuit
[0074] 134: Analog-to-Digital Converter
[0075] 140: Oscillator Circuit
[0076] 200: Test Item
[0077] 300: Radar Transmission Method
[0078] Rin: Input signal
[0079] Rout: Output signal
[0080] Rout': Output signal after compensation
[0081] RI: Radar Reflection Information
[0082] Ain: Receive signal
[0083] Aout: Transmitted signal
[0084] PA: Power Amplifier
[0085] LNA: Low Noise Amplifier
[0086] Wt: Wireless transmission signal
[0087] Wr: Wireless reflected signal
[0088] Tx: Transmitter
[0089] Rx: Receiver
[0090] RS1, RS2, WS1, WS2: Time slots
[0091] RF: Radar frame
[0092] RFS: Reference Frame
[0093] RH: First frequency band
[0094] WH: Second frequency band
[0095] WP: Wireless Network Data Package
[0096] t0, t1, t2, t3, t4: Time
[0097] CS: Control signal
[0098] RP: Energy Correction Signal
[0099] RD: Delay Correction Signal
[0100] RC: Correction signal
[0101] CC: Correcting chirp
[0102] MC: Measuring Chirp
[0103] S310, S320, S330, S340, S350, S360: Steps
Claims
1. A wireless network device, characterized in that, The wireless network device is used for radar transmission operations and wireless network transmission operations, and includes: A signal processing circuit includes a signal generator for generating an output signal, wherein, during the radar transmission operation, the output signal includes a plurality of correction chirps in a radar frame; Transmission circuitry for converting the output signal into a wireless transmission signal; and A receiving circuit is used to receive and convert the wireless reflected signal corresponding to the wireless transmitted signal into an input signal; The signal processing circuit further includes a correction circuit that sets the input signal corresponding to the reference frame as the reference frame signal and compares the input signal with the reference frame signal to adjust the signal generator and the correction circuit. The signal generator is also used to generate multiple measurement chirps in the radar frame, so that the signal processing circuit generates multiple radar reflection information based on the input signal corresponding to the multiple measurement chirps.
2. The wireless network device according to claim 1, characterized in that, The correction circuit includes: An energy correction unit is used to calculate an energy deviation based on the energy difference between the input signal and the reference frame signal and the expected energy difference, and the energy correction unit generates and transmits a control signal to the signal generator based on the energy deviation; The signal generator further adjusts the output signal to a compensated output signal according to the control signal, and the energy correction unit further outputs an energy correction signal according to the input signal corresponding to the compensated output signal.
3. The wireless network device according to claim 2, characterized in that, The correction circuit also includes: A delay correction unit is coupled to the energy correction unit and is used to calculate a delay deviation based on the reception time of the energy correction signal and the expected reception time of the reference frame signal, and the delay correction unit adjusts the energy correction signal into a delay correction signal according to the delay deviation.
4. The wireless network device according to claim 3, characterized in that, The correction circuit also includes: A phase and amplitude correction unit is coupled to the delay correction unit and is used to calculate a phase deviation based on the phase value of the delay correction signal and the reference phase value of the reference frame signal, and to calculate an amplitude deviation based on the amplitude value of the delay correction signal and the reference amplitude value of the reference frame signal, so as to adjust the delay correction signal into a correction signal according to the phase deviation and the amplitude deviation.
5. The wireless network device according to claim 4, characterized in that, The signal processing circuit further includes: A measurement circuit, coupled to the phase and amplitude correction unit, is used to analyze the correction signal to obtain the radar reflection information.
6. The wireless network device according to claim 4, characterized in that, The correction signal includes the plurality of measurement chirps in the radar frame.
7. The wireless network device according to claim 1, characterized in that, The signal processing circuit sets the initial radar frame in the time slot as the reference frame.
8. The wireless network device according to claim 1, characterized in that, The signal processing circuit further includes: A storage circuit, coupled to the correction circuit, is used to record multiple parameters of the reference frame, including a reference energy value, an expected reception time, a reference phase value, and a reference amplitude value.
9. The wireless network device according to claim 1, characterized in that, The signal processing circuit performs the radar transmission operation and the wireless network transmission operation in different time slots respectively. During the radar transmission operation, the output signal is in the first frequency band; During the wireless network transmission operation, the output signal is in the second frequency band, which is different from the first frequency band.
10. A radar transmission method, characterized in that, For a wireless network device, the radar transmission method includes: Generate an output signal, wherein, during radar transmission operation, the output signal includes multiple correction chirps in the radar frame; The output signal is converted into a wireless transmission signal; The wireless reflected signal corresponding to the wireless transmitted signal is converted into an input signal; The input signal corresponding to the reference frame is set as the reference frame signal; Compare the input signal and the reference frame signal to generate multiple measurement chirps in the radar frame; and Multiple radar reflection information is generated based on the input signals corresponding to the multiple measurement chirps.