Demodulation circuit, demodulation control method and electronic equipment

Abstract

The invention discloses a demodulation circuit, a demodulation control method and electronic equipment. The circuit comprises a signal receiving module, a power divider, a first demodulation channel, a second demodulation channel and a frequency mixing module, the signal receiving module is connected with the input end of the power divider, the first output end of the power divider is connected with the first end of the first demodulation channel, the second output end of the power divider is connected with the first end of the second demodulation channel, and the second end of the first demodulation channel is connected with the first input end of the frequency mixing module. The third end of the first demodulation channel is connected with the second input end of the frequency mixing module, and the output end of the frequency mixing module is connected with the second end of the second demodulation channel; the first demodulation channel is used for demodulating the radio frequency signal output by the first output end of the power divider according to the first local oscillator signal to obtain a demodulated signal; and the second demodulation channel is used for demodulating the radio frequency signal output by the second output end of the power divider according to the second local oscillator signal to obtain an SSB signal.

Description

Technical Field

[0001] The present application belongs to the field of communication technology, and specifically relates to a demodulation circuit, a demodulation control method and an electronic device. Background Art

[0002] With the rapid development of communication technology, the fifth generation mobile communication technology (5G) has been widely used. In 5G communication technology, the synchronization signal block (SSB) plays a vital role.

[0003] At present, the RF signal can be demodulated by a demodulation circuit to obtain an SSB signal. Due to the interference of various situations in the 5G New Radio (NR) real network, such as service channel interference of adjacent cells, pilot channel interference, blocking interference between different users, and co-channel interference of 4G base stations, etc. In the related technology, the demodulation circuit usually receives all signals within the bandwidth of the carrier corresponding to the RF signal, including SSB signals and other signals (such as Physical Downlink Shared Channel (PDSCH) signals). In this way, when demodulating, the signal-to-noise ratio of the SSB signal will be reduced due to the presence of interference signals, thereby reducing the demodulation capability of the SSB signal. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a demodulation circuit, a demodulation control method and an electronic device to solve the technical problem of the relatively weak demodulation capability of SSB signals in the related art, and to improve the demodulation capability of SSB signals.

[0005] In a first aspect, an embodiment of the present application provides a demodulation circuit, comprising: a signal receiving module, a power divider, a first demodulation channel, a second demodulation channel and a mixing module; the signal receiving module is used to receive a radio frequency signal; wherein,

[0006] The signal receiving module is connected to the input end of the power divider, the first output end of the power divider is connected to the first end of the first demodulation channel, the second output end of the power divider is connected to the first end of the second demodulation channel, the second end of the first demodulation channel is connected to the first input end of the mixing module, the third end of the first demodulation channel is connected to the second input end of the mixing module, and the output end of the mixing module is connected to the second end of the second demodulation channel;

[0007] Among them, the first demodulation channel is used to demodulate the RF signal output from the first output end of the power divider according to the first local oscillator signal to obtain a demodulated signal, and the demodulated signal is used to represent the frequency offset value of the SSB signal; the second demodulation channel is used to demodulate the RF signal output from the second output end of the power divider according to the second local oscillator signal to obtain the SSB signal, the local oscillator frequency of the first local oscillator signal is the center frequency of the carrier corresponding to the RF signal, the local oscillator frequency of the second local oscillator signal is the center frequency of the subcarrier corresponding to the SSB signal, and the second local oscillator signal is generated by the mixing module based on the demodulated signal and the first local oscillator signal.

[0008] In a second aspect, an embodiment of the present application provides an electronic device, comprising the demodulation circuit as described in the first aspect.

[0009] In a third aspect, an embodiment of the present application provides a demodulation control method, which is performed by an electronic device, wherein the electronic device includes a processor and the demodulation circuit as described in the first aspect, and the method includes:

[0010] The processor acquires configuration parameters when determining that the electronic device establishes a communication connection, where the configuration parameters include a bandwidth of a subcarrier corresponding to an SSB signal;

[0011] The processor configures circuit parameters of the demodulation circuit according to the configuration parameters, wherein the circuit parameters of the demodulation circuit include: a cutoff frequency of a second low-pass filter of a second demodulation channel in the demodulation circuit, wherein the cutoff frequency of the second low-pass filter is configured based on a bandwidth of a subcarrier corresponding to the SSB signal;

[0012] When the circuit parameter configuration of the demodulation circuit is completed, the processor controls the demodulation circuit to demodulate the received RF signal to obtain the SSB signal.

[0013] In a fourth aspect, an embodiment of the present application provides an electronic device, comprising a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the demodulation control method described in the first aspect are implemented.

[0014] In a fifth aspect, an embodiment of the present application provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the demodulation control method described in the first aspect are implemented.

[0015] In an embodiment of the present application, the radio frequency signal received by the signal receiving module can be divided into two by a power divider, and one of the radio frequency signals is demodulated by a first demodulation path according to a first local oscillator signal whose local oscillator frequency is the center frequency of the carrier corresponding to the radio frequency signal, so as to obtain a demodulation signal for representing the frequency offset value of the SSB signal, and a second local oscillator signal whose local oscillator frequency is the center frequency of the subcarrier corresponding to the SSB signal is generated by a mixing module based on the demodulation signal and the first local oscillator signal, and the other radio frequency signal is demodulated by a second demodulation path according to the second local oscillator signal, so as to demodulate and obtain the SSB signal. In this way, by adding a second demodulation channel in the demodulation circuit, the channel carrying the SSB signal can be demodulated separately by the second demodulation channel, so that the signal-to-noise ratio of the SSB signal can be improved, and then the demodulation capability of the SSB signal can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is one of the structural schematic diagrams of the demodulation circuit provided in the embodiment of the present application;

[0017] Figure 2 This is the second structural schematic diagram of the demodulation circuit provided in the embodiment of the present application;

[0018] Figure 3 It is a structural schematic diagram of a demodulation circuit in the related art;

[0019] Figure 4 It is a schematic diagram of the relationship between the first local oscillator signal and the carrier signal;

[0020] Figure 5 It is a schematic diagram of the structure of a resistive power divider;

[0021] Figure 6 It is a schematic diagram of the relationship between the second local oscillator signal and the carrier signal;

[0022] Figure 7 is a flowchart of a demodulation control method provided in an embodiment of the present application;

[0023] Figure 8 is a schematic diagram of the structure of an electronic device provided by some embodiments of the present application;

[0024] Fig. 9 A schematic diagram of the hardware structure of an electronic device provided for some embodiments of the present application. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0026] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0027] The demodulation circuit provided in the embodiment of the present application is described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0028] The demodulation circuit of the embodiment of the present application can receive the RF signal in the 5G NR real network, and perform demodulation based on the RF signal to obtain a 5G NR SSB signal.

[0029] Among them, 5G NR has many information transmission channels for information transmission and control, which are mainly divided into control channels and service channels from the perspective of function. Among them, the control channel is used to transmit control plane information, including the following channels:

[0030] 1. Broadcast Control Channel (BCCH): A downlink channel used to broadcast system control information.

[0031] 2. Paging Control Channel (PCCH): A downlink channel used to transmit paging information and system information change notifications.

[0032] 3. Common Control Channel (CCCH): used to send control information when no Radio Resource Control (RRC) connection has been established between the User Equipment (UE) and the network.

[0033] 4. Dedicated Control Channel (DCCH): used to send one-to-one dedicated control information between the UE and the network after the RRC connection is established.

[0034] Traffic channels are used only to transmit user plane information, including dedicated traffic channels (Dedicated Traffic Channel, DTCH): a channel dedicated to point-to-point user information transmission for one UE, both in the uplink and downlink.

[0035] 5G NR SSB is the abbreviation of Synchronization Signal Block in 5G. In 5G communication technology, SSB plays a vital role. It contains synchronization signals and broadcast signals. The specific synchronization signals include the primary synchronization signal (PSS) and the secondary synchronization signal (SSS). The broadcast signal includes the physical broadcast channel (PBCH) data and the PBCH demodulation reference signal (DMRS).

[0036] 5G NR SSB signals can be used for cell synchronization, pilot signal strength indication, channel control, telephone paging access monitoring and other functions.

[0037] The actual network has a high density and serious interference between carriers. According to the statistics of the reference signal receiving power (RSRP) and signal to noise ratio (SNR) of the real network big data, the network interference is generally above 10 decibels (dB), and SSB, as a channel carrying control functions, is more important. If it is interfered with, it will cause communication abnormalities and reduce user experience. Therefore, it is necessary to improve the demodulation capability of the demodulation circuit, improve the suppression ability of electronic equipment to other signals and interference signals other than SSB signals under strong interference conditions, improve the signal-to-noise ratio of SSB signals, optimize anti-interference capabilities, and thus improve communication throughput and connection rate. Among them, the interference to the SSB signal during demodulation includes but is not limited to the self-interference blocking signal of the frequency division duplexing (FDD) transmission (TX), the in-band interference / out-of-band interference signals of other base stations, and the PDSCH signals of multiple different users.

[0038] Figure 1 is one of the structural schematic diagrams of the demodulation circuit provided in the embodiment of the present application, such as Figure 1 As shown, the demodulation circuit includes a signal receiving module 11, a power divider 12, a first demodulation channel 13, a second demodulation channel 14 and a mixing module 15; the signal receiving module 11 is used to receive a radio frequency signal; wherein,

[0039] The signal receiving module 11 is connected to the input end of the power divider 12, the first output end of the power divider 12 is connected to the first end of the first demodulation channel 13, the second output end of the power divider 12 is connected to the first end of the second demodulation channel 14, the second end of the first demodulation channel 13 is connected to the first input end of the mixing module 15, the third end of the first demodulation channel 13 is connected to the second input end of the mixing module 15, and the output end of the mixing module 15 is connected to the second end of the second demodulation channel 14;

[0040] Among them, the first demodulation channel 13 is used to demodulate the RF signal output from the first output end of the power divider 12 according to the first local oscillator signal to obtain a demodulated signal, and the demodulated signal is used to represent the frequency offset value of the SSB signal; the second demodulation channel 14 is used to demodulate the RF signal output from the second output end of the power divider 12 according to the second local oscillator signal to obtain the SSB signal, the local oscillator frequency of the first local oscillator signal is the center frequency of the carrier corresponding to the RF signal, the local oscillator frequency of the second local oscillator signal is the center frequency of the subcarrier corresponding to the SSB signal, and the second local oscillator signal is generated by the mixing module 15 based on the demodulated signal and the first local oscillator signal.

[0041] The signal receiving module 11 is used to receive radio frequency signals in the communication frequency band of the real network. In some embodiments, for example Figure 2 As shown, the signal receiving module 11 may include an antenna 111, and the antenna 111 may be used to receive radio frequency signals within a communication frequency band in a real network.

[0042] In some embodiments, the signal receiving module 11 may also include a surface acoustic wave (SAW) filter 112 and a low noise power amplifier (LNA) 113. The antenna may be connected to the low noise LNA 113 through the SAW filter 112, and the low noise LNA 113 is connected to the input end of the power divider 12.

[0043] The demodulation circuit can receive the RF signal in the real network through the antenna 111. The RF signal in the real network may include RF signals in multiple communication frequency bands. The RF signal in the interference frequency band can be filtered out through the SAW filter 112, leaving the RF signal in the current communication frequency band. Then, the RF signal in the current communication frequency band can be power amplified by the low-noise LNA 113, and then the power-amplified RF signal can be input into the power divider 12.

[0044] In the related art, the RF signal obtained by the signal receiving module is directly demodulated through the first demodulation channel to obtain the SSB signal, such as Figure 3 As shown, the demodulation circuit in the related art may include a signal receiving module 31 and a first demodulation channel 32, the signal receiving module 31 includes an antenna 311, a SAW filter 312 and a low noise LNA 313, and the first demodulation channel 32 may include a first down-conversion mixer 321, a first low-pass filter 322, a first oscillator 323, a first transimpedance amplifier 324, a first analog-to-digital converter 325 and a first baseband digital processing module 326. The RF signal received by the signal receiving module 31 will be directly input into the first demodulation channel 31, firstly through the first down-conversion mixer 321, according to the first local oscillator signal generated by the first oscillator 323, the RF signal is down-converted to move the RF signal to the baseband, and the interference signal outside the carrier is filtered out through the first low-pass filter 322, and then the baseband signal in the carrier is voltage-amplified through the first transimpedance amplifier 324, and sampled through the first analog-to-digital converter 325, and input into the first baseband digital processing module 326 for baseband processing to realize the demodulation of the SSB signal.

[0045] However, there are many types of interference in the actual 5G NR network, such as interference from the service channels of neighboring cells, interference from pilot channels, blocking interference between different users, and co-channel interference from 4G base stations. The relevant technology is to use a down-conversion of a phase-locked loop to receive and process all signals in the carrier. Figure 4 As shown, the local oscillator frequency of the first local oscillator signal generated by the first oscillator is located at the center frequency of the carrier corresponding to the RF signal, and the RF signal with a bandwidth of 100M (equivalent to 273 resource blocks (RB)) in the carrier corresponding to the RF signal will be received. In this way, it is impossible to distinguish between useful signals and interference signals, and it is impossible to distinguish between SSB signals and PDSCH signals. For the transimpedance amplifier, the excessively high PDSCH signals of other base stations will block the SSB signal, which will limit the gain of the transimpedance amplifier and thus reduce the signal-to-noise ratio of the SSB signal.

[0046] In this embodiment, by adding a power divider 12, the RF signal is divided into two, one of which is input to the first demodulation path 13, and the other is input to the second demodulation path 14. In some embodiments, the RF signal power output by the first output end of the power divider 12 and the second output end of the power divider 12 can be equal.

[0047] Among them, the power divider can use a microstrip line power divider to save costs. If the chip size is limited, a resistive power divider can be used. The resistive power divider consists of three 18 ohm resistors, such as Figure 5 As shown, the insertion loss of the resistive power divider is 6dB, which can simultaneously increase the loss of other components, for example, increasing the loss of the low-noise LNA and mixer in the demodulation circuit by 6dB to offset the impact of the insertion loss on the system noise figure.

[0048] In some embodiments, the circuit structure of the first demodulation channel 13 can be similar to Figure 3 The circuit structure of the first demodulation channel shown is the same. The first demodulation channel 13 can demodulate the radio frequency signal output from the first output end of the power divider 12 according to the first local oscillator signal to obtain a demodulated signal.

[0049] In some embodiments, the first demodulation channel 13 can down-convert the RF signal output from the first output end of the power divider through a first down-conversion mixer according to a first local oscillator signal generated by a first oscillator, so as to move the RF signal to the baseband, and filter out interference signals outside the carrier through a first low-pass filter. Then, the baseband signal in the carrier is voltage-amplified through a first transimpedance amplifier, and sampled through a first analog-to-digital converter, and input into the first baseband digital processing module for demodulation, so as to obtain a frequency offset value of the SSB signal, and then the first baseband digital processing module generates a digital signal based on the frequency offset value, thereby obtaining a demodulated signal.

[0050] The circuit structure of the second demodulation channel 14 can be the same as that of the first demodulation channel 13. The second demodulation channel 14 can demodulate the RF signal output from the second output terminal of the power divider 12 according to the second local oscillator signal to obtain an SSB signal. The local oscillator frequency of the second local oscillator signal is located at the center frequency of the subcarrier corresponding to the SSB signal.

[0051] By adding a second demodulation channel 14, the second demodulation channel 14 can be used alone for demodulation of SSB signals. In some embodiments, since the SSB channel has a bandwidth of only 20 resource blocks (RBs), a lower frequency low-pass filter can be used in the second demodulation channel 14 to filter out non-SSB signals in the carrier, which can increase the gain of the transimpedance amplifier in the second demodulation channel 14, thereby improving the signal-to-noise ratio of the SSB channel, improving the quality of the pilot signal in an interference environment, and improving the connection rate.

[0052] By connecting the second end of the first demodulation channel 13 to the first input end of the mixing module 15, connecting the third end of the first demodulation channel 13 to the second input end of the mixing module 15, and connecting the output end of the mixing module 15 to the second end of the second demodulation channel 14. In this way, the first input end of the mixing module can input the first local oscillation signal, the second input end of the mixing module can input the demodulation signal, and the second local oscillation signal can be generated by the mixing module 15 based on the demodulation signal and the first local oscillation signal, and output to the second demodulation channel 14 for demodulation of the SSB signal.

[0053] In this embodiment, the RF signal can be demodulated by a demodulation circuit to obtain an SSB signal. Due to the interference of various situations in the 5G New Radio (NR) real network, such as service channel interference of adjacent cells, pilot channel interference, blocking interference between different users, and co-channel interference of 4G base stations, etc. In the related art, the demodulation circuit usually receives all signals within the bandwidth of the carrier corresponding to the RF signal, including SSB signals, non-SSB signals (such as Physical Downlink Shared Channel (PDSCH) signals) and interference signals. In this way, when demodulating, the signal-to-noise ratio of the SSB signal will be reduced due to the presence of the interference signal, thereby reducing the demodulation capability of the SSB signal.

[0054] In some embodiments, the demodulated signal may be a digital signal. Figure 2 As shown, the mixing module 15 includes a digital-to-analog converter 151 and a frequency mixer 152; wherein,

[0055] The input end of the digital-to-analog converter 151 is connected to the third end of the first demodulation channel 13, the output end of the digital-to-analog converter 151 is connected to the second input end of the frequency mixer 152, the first input end of the frequency mixer 152 is connected to the second end of the first demodulation channel 13, and the output end of the frequency mixer 152 is connected to the second end of the second demodulation channel 14;

[0056] The digital-to-analog converter 151 is used to perform digital-to-analog conversion on the demodulated signal to obtain a digital intermediate frequency, and the frequency mixer 152 is used to mix the digital intermediate frequency with the first local oscillator signal to obtain the second local oscillator signal.

[0057] The demodulated signal can use the digital-to-analog converter 151 to generate a digital intermediate frequency, and after mixing with the first local oscillator signal, a second local oscillator signal for representing the center frequency of the subcarrier corresponding to the SSB signal can be obtained. The second local oscillator signal can be used to down-convert the RF signal to obtain a baseband signal.

[0058] In some embodiments, the first demodulation channel 13 includes a first down-conversion mixer 131, a first oscillator 132, a first low-pass filter 133 and a first processing module 134, wherein:

[0059] The first input end of the first down-conversion mixer 131 is connected to the first output end of the power divider 12, the second input end of the first down-conversion mixer 131 is connected to the first oscillator 132, and the output end of the first down-conversion mixer 131 is connected to the input end of the first processing module 134 through the first low-pass filter 133;

[0060] The first input end of the frequency mixer 152 is connected to the first oscillator 132 , and the output end of the first processing module 134 is connected to the input end of the digital-to-analog converter 151 ;

[0061] The local oscillator signal of the first oscillator 132 is the first local oscillator signal, and the cutoff frequency of the first low-pass filter 133 is determined based on the bandwidth of the carrier corresponding to the radio frequency signal.

[0062] In some embodiments, the first processing module 134 may include a first transimpedance amplifier 1341 , a first analog-to-digital converter 1342 , and a first baseband digital processing module 1343 .

[0063] The cutoff frequency of the first low-pass filter in the first demodulation channel 13 may be the bandwidth of the carrier corresponding to the radio frequency signal, such as a 100M bandwidth.

[0064] In some embodiments, the second demodulation channel 14 includes a second down-conversion mixer 141, a second oscillator 142, a second low-pass filter 143 and a second processing module 144; wherein,

[0065] The first input end of the second down-conversion mixer 141 is connected to the second output end of the power divider 12, the second input end of the second down-conversion mixer 141 is connected to the second oscillator 142, and the output end of the second down-conversion mixer 141 is connected to the input end of the second processing module 144 through the second low-pass filter 143;

[0066] The output end of the frequency mixer 152 is connected to the second oscillator 142;

[0067] The local oscillator signal of the second oscillator 142 is the second local oscillator signal, and the cutoff frequency of the second low-pass filter 143 is determined based on the bandwidth of the subcarrier corresponding to the SSB signal.

[0068] Since the second demodulation channel 14 can be used alone for demodulating the SSB signal, and since the SSB channel has only a 20RB bandwidth, a low-pass filter with a lower cutoff frequency can be used to filter out all signals except the SSB signal in the carrier corresponding to the RF signal, thereby increasing the gain of the second transimpedance amplifier, thereby improving the signal-to-noise ratio of the SSB channel, improving the quality of the pilot signal in an interference environment, and improving the connection rate.

[0069] In some embodiments, the cutoff frequency of the second low-pass filter 143 is set to 3.6 MHz for a 15 kHz subcarrier and 7.2 MHz for a 30 kHz subcarrier because the SSB signal has only 20 RBs. The cutoff frequency of the first low-pass filter can be set according to the bandwidth of the carrier corresponding to the RF signal.

[0070] In this embodiment, the second local oscillator signal can be obtained by mixing, and its local oscillator frequency is the center frequency of the subcarrier corresponding to the SSB signal, such as Figure 6 As shown, the cutoff frequency of the second low-pass filter 143 is set to the bandwidth of the subcarrier corresponding to the SSB signal, so as to ensure that the second low-pass filter can effectively filter out the interference signal, which may include in-band interference, out-of-band interference and PDSCH signals of multiple different users.

[0071] An embodiment of the present application further provides an electronic device, which may include the demodulation circuit provided by the above embodiment, and the demodulation circuit may demodulate the electronic device to obtain an SSB signal.

[0072] The present application also provides a demodulation control method, which is performed by an electronic device, wherein the electronic device includes a processor and the above-mentioned demodulation circuit. The process of the method is as follows: Figure 7 As shown, the following steps are included:

[0073] Step 701: When determining that the electronic device establishes a communication connection, the processor acquires configuration parameters, where the configuration parameters include a bandwidth of a subcarrier corresponding to an SSB signal;

[0074] Step 702: The processor configures circuit parameters of the demodulation circuit according to the configuration parameters, where the circuit parameters of the demodulation circuit include: a cutoff frequency of a second low-pass filter of a second demodulation channel in the demodulation circuit, where the cutoff frequency of the second low-pass filter is configured based on a bandwidth of a subcarrier corresponding to the SSB signal;

[0075] Step 703: When the circuit parameter configuration of the demodulation circuit is completed, the processor controls the demodulation circuit to demodulate the received RF signal to obtain the SSB signal.

[0076] The electronic device may be a terminal.

[0077] In step 701, the terminal may establish a communication connection with the base station through the following operations.

[0078] Operation 1, you can search for synchronization information, including but not limited to the following process to improve the efficiency of the search and find the cell with the strongest information.

[0079] Process A, defining the synchronization grid: To shorten the cell search time, NR defines a synchronization grid to indicate where the SSB may appear in frequency.

[0080] Process B uses the synchronization signal group: the periodic transmission of SSB and the concept of SS burst set to help the terminal perform cell search on different beams.

[0081] Process C, synchronization signal design using ZC sequence: In order to support different numerology parameters (the numerology parameter is used to indicate the subcarrier spacing), if the same length / subcarrier as NR-PSS is used, the bandwidth will be scaled. The selection of ZC sequence takes into account the detection complexity when dealing with large frequency errors, and frequency and time synchronization can be obtained with lower complexity.

[0082] Operation 2: In the mobile communication system, the downlink synchronization and decoding process of NR involves steps such as carrier detection, symbol synchronization, and subcarrier analysis. After synchronizing to the symbol, the receiver in the electronic device can perform correlation demodulation and denoising, and then decode the RF signal to obtain system information.

[0083] Operation 3, the main purpose of the NR random access process is to establish uplink synchronization and assign a unique identifier to a terminal in order to request the network to allocate uplink resources for it. This process is not only used for initial access, but also for new cell access during switching, access after radio link failure, re-restoring uplink synchronization when there is uplink and downlink data transmission, and uplink shared channel (UL-SCH) resource request and other scenarios. The uplink synchronization process is the process in which the UE and the base station achieve uplink synchronization of the wireless access system and obtain resource allocation for message 3. This process starts after the initial access (i.e., the uplink synchronization process) is completed. The main purpose is to ensure that the UE's uplink transmission is aligned with the expected reception time of the base station, thereby optimizing communication quality and efficiency.

[0084] Operation 4, obtaining the base station ID indicates that the terminal successfully establishes a communication connection with the base station and enters the standby or service mode. If unsuccessful, repeat the above operation. If successful, perform the process of configuring the demodulation circuit.

[0085] In step S701, the configuration information can be obtained through the system information decoded by the electronic device. The configuration information may include the bandwidth of the subcarrier corresponding to the SSB signal, and the subcarrier spacing calculation of the NR is based on the numerology parameter, which determines the size of the subcarrier spacing.

[0086] Among them, NR supports multiple subcarrier spacings, including 15kHz, 30kHz, 60kHz, 120kHz, 240kHz, etc. These spacings are based on 15kHz and expanded by 2 to the power of μ.

[0087] Where μ is a numerology parameter, which indicates the multiple of the subcarrier spacing relative to 15kHz. For example, a subcarrier spacing of 30kHz can be expressed as 2μ2^\mu2μkHz, where μ\muμ is the corresponding value.

[0088] In step 702, after determining the subcarrier spacing frequency, the circuit parameters of the demodulation circuit can be configured. The circuit parameters of the demodulation circuit may include the cutoff frequency of the second low-pass filter. Since SSB is fixed to 20 RBs, each RB = 12*subcarrier spacing, the cutoff frequency of the second low-pass filter is set to the bandwidth of the subcarrier corresponding to the SSB signal, that is, 20*12*subcarrier spacing. For example, at a subcarrier spacing of 15kHz, the cutoff frequency of the second low-pass filter is 3.6MHz, at a subcarrier spacing of 30kHz, the cutoff frequency of the second low-pass filter is 7.2MHz, and at a subcarrier spacing of 60kHz, the cutoff frequency of the second low-pass filter is 14.4MHz.

[0089] In this way, when the circuit parameter configuration of the demodulation circuit is completed, the processor can control the demodulation circuit to demodulate the received RF signal to obtain the SSB signal.

[0090] In some embodiments, the processor can control the start of the second demodulation channel, and demodulate the received RF signal in combination with the first demodulation channel and the second demodulation channel to obtain an SSB signal. In some embodiments, the processor can control the shutoff of the second demodulation channel, and demodulate the received RF signal through the first demodulation channel to obtain an SSB signal.

[0091] In this embodiment, the cutoff frequency of the second low-pass filter is configured based on the bandwidth of the subcarrier corresponding to the SSB signal. When the configuration is completed, the processor controls the demodulation circuit to demodulate the received RF signal, so that all interference signals in the carrier can be filtered out and the gain of the transimpedance amplifier can be improved, thereby improving the signal-to-noise ratio of the SSB channel, improving the quality of the pilot signal in an interference environment, and improving the connection rate.

[0092] In some embodiments, the configuration parameters also include the center frequency and bandwidth of the carrier corresponding to the RF signal, and the circuit parameters of the demodulation circuit also include: the cutoff frequency of the first low-pass filter of the first demodulation channel in the demodulation circuit, and the first local oscillator signal of the first oscillator in the first demodulation channel, the cutoff frequency of the first low-pass filter is configured based on the bandwidth of the carrier corresponding to the RF signal, and the local oscillator frequency of the first local oscillator signal is configured to the center frequency of the carrier corresponding to the RF signal.

[0093] Since the electronic device is constantly moving, the frequency band of the received radio frequency signal will also change, so the circuit parameters of the first demodulation channel need to be reconfigured.

[0094] In some embodiments, the system information may also include the center frequency and bandwidth of the carrier corresponding to the RF signal. In some embodiments, the subcarrier frequency offset (i.e., kSSB) of the SSB channel and the downlink control channel (Physical Downlink Control Channel, PDCCH) configuration information for the system information block 1 (System Information Block, SIB1) can be obtained by parsing the carrier frequency and physical cell identifier (Physical Cell Identifier, PCI) of the SSB channel and reading the physical broadcast channel (Physical Broadcast Channel, PBCH), so as to determine the frequency position and bandwidth of the control resource set (Control Resource Set, CORESET).

[0095] The cutoff frequency of the first low-pass filter of the first demodulation channel in the demodulation circuit can be set to the bandwidth of the carrier corresponding to the RF signal, and the local oscillation frequency of the first local oscillation signal of the first oscillator can be configured as the center frequency of the carrier corresponding to the RF signal.

[0096] In some embodiments, the processor controls the demodulation circuit to demodulate the received radio frequency signal to obtain the SSB signal, including:

[0097] When the processor detects that the signal-to-noise ratio of the radio frequency signal is less than or equal to a preset threshold, the processor controls the first demodulation channel and the second demodulation channel in the demodulation circuit to demodulate the received radio frequency signal to obtain the SSB signal;

[0098] When the processor detects that the signal-to-noise ratio of the radio frequency signal is higher than a preset threshold, the processor controls the first demodulation channel in the demodulation circuit to demodulate the received radio frequency signal to obtain the SSB signal.

[0099] The preset threshold can be set according to actual conditions, such as -3dB.

[0100] When the signal-to-noise ratio of the RF signal is detected to be higher than the preset threshold, it indicates that the carrier signal strength is good and is usually not interfered by other interference signals, that is, even if an interference signal is mixed in, it will not affect the signal-to-noise ratio of the current carrier. At this time, the first demodulation channel can be controlled to start demodulating the SSB signal.

[0101] When the signal-to-noise ratio of the RF signal is less than or equal to the preset threshold, it means that the carrier signal strength is weak and the demodulation capability of the SSB signal needs to be improved. At this time, the second demodulation channel can be controlled to start, and the SSB signal can be demodulated in combination with the first demodulation channel and the second demodulation channel to improve the communication quality of electronic equipment in weak signal and interference environments.

[0102] Alternatively, if Figure 8 As shown, an embodiment of the present application also provides an electronic device 800, including a processor 801 and a memory 802, wherein the memory 802 stores programs or instructions that can be executed on the processor 801, and when the program or instructions are executed by the processor 801, the various steps of the above-mentioned demodulation control method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, they are not repeated here.

[0103] It should be noted that the electronic devices in the embodiments of the present application include mobile electronic devices and non-mobile electronic devices.

[0104] Fig. 9 A schematic diagram of the hardware structure of an electronic device to implement an embodiment of the present application.

[0105] The electronic device 900 includes but is not limited to: a radio frequency unit 901, a network module 902, an audio output unit 903, an input unit 904, a sensor 905, a display unit 906, a user input unit 907, an interface unit 908, a memory 909, and a processor 910. The electronic device may also include a demodulation circuit.

[0106] Those skilled in the art will appreciate that the electronic device 900 may also include a power source (such as a battery) for supplying power to each component, and the power source may be logically connected to the processor 910 through a power management system, thereby implementing functions such as managing charging, discharging, and power consumption management through the power management system. Fig. 9 The electronic device structure shown in the figure does not constitute a limitation on the electronic device. The electronic device may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently, which will not be described in detail here.

[0107] The processor 910 is configured to:

[0108] In the case of determining that the electronic device establishes a communication connection, obtaining configuration parameters, where the configuration parameters include a bandwidth of a subcarrier corresponding to an SSB signal;

[0109] According to the configuration parameters, configuring circuit parameters of the demodulation circuit, the circuit parameters of the demodulation circuit including: a cutoff frequency of a second low-pass filter of a second demodulation channel in the demodulation circuit, the cutoff frequency of the second low-pass filter being configured based on a bandwidth of a subcarrier corresponding to the SSB signal;

[0110] When the circuit parameter configuration of the demodulation circuit is completed, the demodulation circuit is controlled to demodulate the received radio frequency signal to obtain the SSB signal.

[0111] In this embodiment, the cutoff frequency of the second low-pass filter is configured based on the bandwidth of the subcarrier corresponding to the SSB signal. When the configuration is completed, the processor controls the demodulation circuit to demodulate the received RF signal, so that all interference signals in the carrier can be filtered out and the gain of the transimpedance amplifier can be improved, thereby improving the signal-to-noise ratio of the SSB channel, improving the quality of the pilot signal in an interference environment, and improving the connection rate.

[0112] Optionally, the configuration parameters also include the center frequency and bandwidth of the carrier corresponding to the RF signal, and the circuit parameters of the demodulation circuit also include: the cutoff frequency of the first low-pass filter of the first demodulation channel in the demodulation circuit, and the first local oscillator signal of the first oscillator in the first demodulation channel, the cutoff frequency of the first low-pass filter is configured based on the bandwidth of the carrier corresponding to the RF signal, and the local oscillator frequency of the first local oscillator signal is configured to the center frequency of the carrier corresponding to the RF signal.

[0113] Optionally, the processor 910 is further configured to:

[0114] When it is detected that the signal-to-noise ratio of the radio frequency signal is less than or equal to a preset threshold, controlling the first demodulation channel and the second demodulation channel in the demodulation circuit to demodulate the received radio frequency signal to obtain the SSB signal;

[0115] When it is detected that the signal-to-noise ratio of the radio frequency signal is higher than a preset threshold, the first demodulation channel in the demodulation circuit is controlled to demodulate the received radio frequency signal to obtain the SSB signal.

[0116] It should be understood that in the embodiment of the present application, the input unit 904 may include a graphics processor (Graphics Processing Unit, GPU) 9041 and a microphone 9042, and the graphics processor 9041 processes the image data of the static picture or video obtained by the image capture device (such as a camera) in the video capture mode or the image capture mode. The display unit 906 may include a display panel 9061, and the display panel 9061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 907 includes a touch panel 9071 and at least one of other input devices 9072. The touch panel 9071 is also called a touch screen. The touch panel 9071 may include two parts: a touch detection device and a touch controller. Other input devices 9072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

[0117] The memory 909 can be used to store software programs and various data. The memory 909 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instructions required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 909 may include a volatile memory or a non-volatile memory, or the memory 909 may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM) and a direct memory bus random access memory (DRRAM). The memory 909 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0118] The processor 910 may include one or more processing units; in some embodiments, the processor 910 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and application programs, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It is understandable that the modem processor may not be integrated into the processor 910.

[0119] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned demodulation control method embodiment are implemented and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0120] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0121] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned demodulation control method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0122] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0123] An embodiment of the present application provides a computer program product, which is stored in a storage medium. The program product is executed by at least one processor to implement the various processes of the above-mentioned demodulation control method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0124] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0125] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling an electronic device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0126] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A demodulation circuit, characterized in that: include: A signal receiving module, a power divider, a first demodulation channel, a second demodulation channel and a mixing module; The signal receiving module is used to receive radio frequency signals; wherein, The signal receiving module is connected to the input end of the power divider, the first output end of the power divider is connected to the first end of the first demodulation channel, the second output end of the power divider is connected to the first end of the second demodulation channel, the second end of the first demodulation channel is connected to the first input end of the mixing module, the third end of the first demodulation channel is connected to the second input end of the mixing module, and the output end of the mixing module is connected to the second end of the second demodulation channel; Among them, the first demodulation channel is used to demodulate the RF signal output from the first output end of the power divider according to the first local oscillator signal to obtain a demodulated signal, and the demodulated signal is used to represent the frequency offset value of the SSB signal; the second demodulation channel is used to demodulate the RF signal output from the second output end of the power divider according to the second local oscillator signal to obtain the SSB signal, the local oscillator frequency of the first local oscillator signal is the center frequency of the carrier corresponding to the RF signal, the local oscillator frequency of the second local oscillator signal is the center frequency of the subcarrier corresponding to the SSB signal, and the second local oscillator signal is generated by the mixing module based on the demodulated signal and the first local oscillator signal.

2. The circuit according to claim 1, characterized in that The mixing module includes a digital-to-analog converter and a frequency mixer; wherein, The input end of the digital-to-analog converter is connected to the third end of the first demodulation channel, the output end of the digital-to-analog converter is connected to the second input end of the frequency mixer, the first input end of the frequency mixer is connected to the second end of the first demodulation channel, and the output end of the frequency mixer is connected to the second end of the second demodulation channel; The digital-to-analog converter is used to perform digital-to-analog conversion on the demodulated signal to obtain a digital intermediate frequency, and the frequency mixer is used to mix the digital intermediate frequency with the first local oscillator signal to obtain the second local oscillator signal.

3. The circuit according to claim 2, characterized in that The first demodulation channel includes a first down-conversion mixer, a first low-pass filter, a first oscillator and a first processing module, wherein: The first input end of the first down-conversion mixer is connected to the first output end of the power divider, the second input end of the first down-conversion mixer is connected to the first oscillator, and the output end of the first down-conversion mixer is connected to the input end of the first processing module through the first low-pass filter; The first input terminal of the frequency mixer is connected to the first oscillator, and the output terminal of the first processing module is connected to the input terminal of the digital-to-analog converter; The local oscillator signal of the first oscillator is the first local oscillator signal, and the cutoff frequency of the first low-pass filter is determined based on the bandwidth of the carrier corresponding to the radio frequency signal.

4. The circuit according to claim 2 or 3, characterized in that The second demodulation channel includes a second down-conversion mixer, a second low-pass filter, a second oscillator and a second processing module; wherein, The first input end of the second down-conversion mixer is connected to the second output end of the power divider, the second input end of the second down-conversion mixer is connected to the second oscillator, and the output end of the second down-conversion mixer is connected to the input end of the second processing module through the second low-pass filter; The output end of the frequency mixer is connected to the second oscillator; The local oscillator signal of the second oscillator is the second local oscillator signal, and the cutoff frequency of the second low-pass filter is determined based on the bandwidth of the subcarrier corresponding to the SSB signal.

5. An electronic device, characterized in that: The method comprises the demodulation circuit as claimed in any one of claims 1 to 4.

6. A demodulation control method, characterized in that: The method is performed by an electronic device, the electronic device comprising a processor and a demodulation circuit as claimed in any one of claims 1 to 4, the method comprising: The processor acquires configuration parameters when determining that the electronic device establishes a communication connection, where the configuration parameters include a bandwidth of a subcarrier corresponding to an SSB signal; The processor configures circuit parameters of the demodulation circuit according to the configuration parameters, wherein the circuit parameters of the demodulation circuit include: a cutoff frequency of a second low-pass filter of a second demodulation channel in the demodulation circuit, wherein the cutoff frequency of the second low-pass filter is configured based on a bandwidth of a subcarrier corresponding to the SSB signal; When the circuit parameter configuration of the demodulation circuit is completed, the processor controls the demodulation circuit to demodulate the received RF signal to obtain the SSB signal.

7. The method according to claim 6, characterized in that The configuration parameters also include the center frequency and bandwidth of the carrier corresponding to the RF signal. The circuit parameters of the demodulation circuit also include: the cutoff frequency of the first low-pass filter of the first demodulation channel in the demodulation circuit, and the first local oscillator signal of the first oscillator in the first demodulation channel. The cutoff frequency of the first low-pass filter is configured based on the bandwidth of the carrier corresponding to the RF signal, and the local oscillator frequency of the first local oscillator signal is configured as the center frequency of the carrier corresponding to the RF signal.

8. The method according to claim 6 or 7, characterized in that: The processor controls the demodulation circuit to demodulate the received radio frequency signal to obtain the SSB signal, including: When the processor detects that the signal-to-noise ratio of the radio frequency signal is less than or equal to a preset threshold, the processor controls the first demodulation channel and the second demodulation channel in the demodulation circuit to demodulate the received radio frequency signal to obtain the SSB signal; When the processor detects that the signal-to-noise ratio of the radio frequency signal is higher than a preset threshold, the processor controls the first demodulation channel in the demodulation circuit to demodulate the received radio frequency signal to obtain the SSB signal.

9. An electronic device, characterized in that: It includes a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the demodulation control method as described in any one of claims 6 to 8 are implemented.

10. A readable storage medium, characterized in that: The readable storage medium stores programs or instructions, and when the programs or instructions are executed by the processor, the steps of the demodulation control method according to any one of claims 6 to 8 are implemented.

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