Signal receiving device, receiver and signal adjusting method

Abstract

The embodiment of the invention provides a signal receiving device, a receiver and a signal adjusting method. The signal receiving device comprises a low noise amplifier used for amplifying a received radio frequency signal; the analog local oscillator signal source is used for outputting an analog local oscillator signal; the analog mixer is used for mixing the amplified radio frequency signal and the analog local oscillator signal to obtain a low-intermediate frequency analog signal; the analog-to-digital converter is used for converting the low-intermediate-frequency analog signal into a low-intermediate-frequency digital signal; the first digital local oscillator signal source is used for outputting a first digital local oscillator signal; the first digital mixer is used for mixing the low-intermediate-frequency digital signal and the first digital local oscillator signal to obtain a zero-intermediate-frequency digital signal; and the channel filter is used for filtering direct current bias in the zero intermediate frequency digital signal to obtain a baseband signal.

Description

Technical Field

[0001] The present application relates to the field of communications, more specifically to the field of wireless communications, and in particular to a signal receiving device, a receiver, and a signal adjustment method. Background Art

[0002] Thanks to the rapid development of communication technology, electronic devices can exchange information. In wireless communication, electronic devices can communicate based on radio frequency signals. Its working principle is as follows: electronic devices based on radio frequency signal communication are usually equipped with transmitters and receivers. The sending device modulates the information to be sent into a radio frequency signal and transmits it outward through its own transmitter. The receiving device receives the radio frequency signal through its own receiver and demodulates the information from it. In the related art, the receiver is affected by the defects of the receiver's own hardware during the demodulation of the received radio frequency signal, which will form a DC bias. The DC bias will cause a certain error in the demodulated information, and appropriate measures need to be taken to reduce the error. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a signal receiving device, a receiver, and a signal adjustment method, which can solve the technical problem that the DC bias formed during the demodulation of the RF signal affects the correctness of the demodulation to a certain extent.

[0004] A first aspect of an embodiment of the present application provides a signal receiving device, which includes: a low-noise amplifier, used to amplify a received radio frequency signal; an analog local oscillator signal source, used to output an analog local oscillator signal; an analog mixer, used to mix the amplified radio frequency signal and the analog local oscillator signal to obtain a low intermediate frequency analog signal; an analog-to-digital converter, used to convert the low intermediate frequency analog signal into a low intermediate frequency digital signal; a first digital local oscillator signal source, used to output a first digital local oscillator signal; a first digital mixer, used to mix the low intermediate frequency digital signal and the first digital local oscillator signal to obtain a zero intermediate frequency digital signal; and a channel filter, used to filter out a DC bias in the zero intermediate frequency digital signal to obtain a baseband signal.

[0005] A second aspect of an embodiment of the present application provides a receiver, which includes the signal receiving device described in the first aspect.

[0006] The third aspect of the embodiment of the present application provides a signal adjustment method, which is applied to the signal receiving device described in the first aspect and the receiver described in the second aspect, and the method includes: when the processor receives the detection result of the interference detection module, determining the current frequency conversion state of the analog local oscillator signal input to the analog mixer; the processor controls the analog local oscillator signal source to adjust the first frequency of the analog local oscillator signal according to the detection result and the current frequency conversion state.

[0007] In the embodiment of the present application, during the demodulation of the received radio frequency signal by the signal receiving device, at least one of "local oscillator leakage" and "self-mixing" may be formed at the low noise amplifier and the analog mixer, thereby causing a DC bias in the low intermediate frequency analog signal output after the analog mixer demodulates the radio frequency signal. The low intermediate frequency analog signal with a DC bias is converted into a low intermediate frequency digital signal with a DC bias by the analog-to-digital converter. During the demodulation of the low intermediate frequency digital signal with a DC bias into a zero intermediate frequency digital signal by the first digital mixer, the DC bias is simultaneously transferred to the outside of the channel where the baseband signal is located, and the DC bias is quickly filtered out by the channel filter to obtain the baseband signal. This effectively eliminates the influence of the DC bias formed during the demodulation of the radio frequency signal on the correctness of the demodulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a schematic diagram of a signal receiving device;

[0009] Figure 2 is a schematic diagram of a signal receiving device;

[0010] Figure 3 is a structural schematic diagram of a signal receiving device provided in an embodiment of the present application;

[0011] Figure 4 is a structural schematic diagram of a signal receiving device provided in an embodiment of the present application;

[0012] Figure 5 is a structural schematic diagram of a signal receiving device provided in an embodiment of the present application;

[0013] Figure 6 is a structural schematic diagram of a signal receiving device provided in an embodiment of the present application;

[0014] Figure 7 yes Figure 6 A schematic diagram of the working principle of the signal receiving device provided;

[0015] Figure 8 is a structural schematic diagram of a signal receiving device provided in an embodiment of the present application;

[0016] Fig. 9is a structural schematic diagram of a signal receiving device provided in an embodiment of the present application;

[0017] Fig.10 is a structural schematic diagram of a signal receiving device provided in an embodiment of the present application;

[0018] Fig.11 is a structural schematic diagram of a signal receiving device provided in an embodiment of the present application;

[0019] Fig.12 is a structural schematic diagram of a signal receiving device provided in an embodiment of the present application;

[0020] Fig.13 is a structural schematic diagram of a signal receiving device provided in an embodiment of the present application;

[0021] Fig.14 This is the step flow of the signal adjustment method provided in the embodiment of the present application;

[0022] Fig.15 It shows Fig.13 A schematic diagram of the adjustment principle of the A LO sig of the Mixer of the signal receiving device 1100;

[0023] Fig.16 It is a structural schematic diagram of another electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] 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.

[0025] 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 data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, 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.

[0026] like Figure 1 (or Figure 2 ), Figure 1 (or Figure 2) is a schematic diagram of a signal receiving device. Figure 1 (or Figure 2 ), the signal receiving device 100 includes: a low noise amplifier (LNA, Low Noise Amplifier), an analog local oscillator signal (LO sig, Local Oscillator signal) source (in Figure 1 and Figure 2 Not shown, for example, it may be a phase-locked loop (PLL), an analog mixer (Mixer), an automatic gain controller (PGA), an anti-aliasing filter (AAF), an analog-to-digital converter (ADC), a decimation filter (Decimation Filter), a channel filter (Channel Filter), a real-time DC offset canceller (RDOC) or a high-pass filter (HPF), a digital signal processor (DSP).

[0027] Please continue to see Figure 1 (or Figure 2 ), where LNA amplifies the received RF signal (RF sig, Radio Frequency signal), and Mixer mixes the analog LO sig with the amplified RF sig, thereby demodulating the amplified RF sig into a low intermediate frequency analog signal. Because the isolation between the RF sig input port of the Mixer, the LO sig input port of the Mixer, the RF sig input port of the LNA, and the RF sig output port of the LNA is not good, during the demodulation process of the Mixer, the LO sig may crosstalk to the RF sig input port of the LNA and the RF sig input port of the Mixer, causing the LO sig to pass directly through the LNA and the Mixer. This phenomenon is called "local oscillator leakage" (such as Figure 1 At the same time, the RF sig output by the LNA may also crosstalk to the LO sig input port of the Mixer. This phenomenon is called "self-mixing" (as shown in Figure 2Whether it is local oscillator leakage or self-mixing, it will cause the low intermediate frequency analog signal output by the mixer after demodulation to contain a DC offset (DC Offset, Direct Current Offset). Next, PGA, AAF and ADC successively perform gain stabilization, anti-aliasing filtering and analog-to-digital conversion processing on the low intermediate frequency signal containing DC Offset to obtain the low intermediate frequency digital signal containing DC Offset output by the ADC. Next, Decimation Filter and Channel Filter successively perform down-sampling and channel selection filtering processing on the low intermediate frequency digital signal containing DC Offset (mainly filtering out interference signals in channels other than the channel where the baseband signal (BB sig, Base Band signal) is located, and in the low intermediate frequency digital signal, the DC Offset is also in the channel where the BB sig is located). Then, RDOC cancels the DC Offset in the low intermediate frequency digital signal containing DC Offset output by the Channel Filter or HPF performs AC coupling processing on the low intermediate frequency signal containing DC Offset output by the Channel Filter to eliminate the DC Offset. Finally, RDOC or HPF inputs the low intermediate frequency digital signal with the DC Offset eliminated into the DSP.

[0028] Therefore, in Figure 1 (or Figure 2 ) uses RDOC or HPF to eliminate DC Offset. However, RDOC has limitations, that is, it is only applicable to constant envelope modulation signals such as frequency modulation (FM) signals, and the effect of RDOC in eliminating DC Offset is not ideal. HPF naturally responds slowly because it uses AC coupling for processing, and the effect of HPF in eliminating DC Offset is not ideal either.

[0029] It should be stated that Figure 1 (or Figure 2 Although the signal receiving device 100 shown in the figure is the object of improvement of the embodiment of the present application, it does not represent Figure 1 (or Figure 2 ) is the prior art of the present application. Figure 1 (or Figure 2 ) is the prior art of the present application, it should not be subjectively or objectively directly Figure 1 (or Figure 2 ) is identified as the prior art of the present application.

[0030] The signal receiving device, receiver, signal adjustment method, electronic device and medium, chip and computer program product provided in the embodiments of the present application can effectively solve the above technical problems.

[0031] like Figure 3 As shown, Figure 3 200 is a schematic diagram of the structure of the signal receiving device provided in the embodiment of the present application. The signal receiving device 200 includes: a low noise amplifier, an analog local oscillator signal source, an analog mixer, an analog mixer, a first digital local oscillator signal source, a first digital mixer, and a channel filter. Figure 3 , low noise amplifier, analog local oscillator signal source, analog mixer, analog mixer, first digital local oscillator signal source, first digital mixer, channel filter are LNA, analog LOsig source (in Figure 3 ), Mixer, ADC, first digital LO sig source (in Figure 3 Not shown), a first digital mixer (1 st Complex Mixer), Channel Filter.

[0032] Please continue to see Figure 3 ,same Figure 1 The signal receiving device 100 shown in FIG. Figure 3 In the signal receiving device 200 shown, LNA amplifies the received RF sig, and the Mixer mixes the analog LO sig (ALO sig, Analog Local Oscillator signal) output by the analog LO sig source with the amplified RF sig, thereby demodulating the amplified RF sig into a low intermediate frequency analog signal. The Mixer may also produce at least one of the two phenomena of "local oscillator leakage" and "self-mixing" during the demodulation process. That is, the low intermediate frequency analog signal output by the Mixer also contains DC Offset. Then, the ADC performs analog-to-digital conversion on the low intermediate frequency analog signal containing DC Offset output by the Mixer, and converts the low intermediate frequency analog signal containing DC Offset into a low intermediate frequency digital signal. Obviously, the low intermediate frequency digital signal also contains DC Offset.

[0033] Please continue to see Figure 3 , then, 1 st The Complex Mixer combines the low intermediate frequency digital signal containing DC Offset output by the ADC with the first digital LO sig (1 stD LO sig, First Digital Local Oscillator signal) is mixed to demodulate the low intermediate frequency digital signal containing DC Offset into a zero intermediate frequency digital signal containing DC Offset. st During the mixing process of Complex Mixer, DC Offset will be transferred out of band ("band" refers to the channel where BB sig is located, and "out of band" refers to the channel outside the channel where BB sig is located). st The out-of-band signals in the zero-IF digital signal output by the Complex Mixer are filtered out, and the DC Offset is transferred out of the band. The Channel Filter will also filter out the DC Offset, and finally get BBsig.

[0034] In the embodiment of the present application, during the demodulation of the received RF sig by the signal receiving device 200, at least one of "local oscillator leakage" and "self-mixing" may be formed at the LNA and the Mixer, resulting in a DC offset in the low intermediate frequency analog signal output after the Mixer demodulates the RF sig. The low intermediate frequency analog signal with the DC offset is converted into a low intermediate frequency digital signal with the DC offset by the ADC. st In the process of demodulating the low intermediate frequency digital signal with DC Offset into a zero intermediate frequency digital signal, the Complex Mixer simultaneously transfers the DC Offset to the channel where the BB sig is located, and quickly filters out the DC Offset through the Channel Filter to obtain the BB sig, thereby effectively eliminating the influence of the DC Offset formed in the RFsig demodulation process on the correctness of demodulation.

[0035] Please continue to see Figure 3 In some optional implementations, the first frequency f1 of A LO sig is determined by converting the reference frequency f0 according to the frequency conversion frequency Δf, where Δf is determined according to 1 st D LO sig is determined by the second frequency -f2.

[0036] Exemplarily, the default f1 is obtained by down-converting f0 according to Δf, that is, f1 = f0 - Δf, and |Δf| = |f2|. st Complex Mixer is based on 1 when mixing. st D LO sig down-converts the low intermediate frequency digital signal output by the ADC.

[0037] like Figure 4 , which shows a schematic diagram of the structure of a signal receiving device provided in an embodiment of the present application. Figure 4 , the signal receiving device 300 Figure 3 The signal receiving device 200 shown in the figure also includes: PGA and AAF. PGA is used to stabilize the low intermediate frequency analog signal output by the mixer, and AAF is used to perform anti-aliasing filtering on the stabilized low intermediate frequency analog signal and input the filtered low intermediate frequency analog signal into the ADC.

[0038] like Figure 5 , which shows a schematic diagram of the structure of a signal receiving device provided in an embodiment of the present application. Figure 5 , the signal receiving device 400 Figure 3 The signal receiving device 200 shown in the figure further includes: a Decimation Filter. The Decimation Filter downsamples the low intermediate frequency digital signal output by the ADC, and inputs the downsampled low intermediate frequency digital signal into the 1 st Complex Mixer.

[0039] like Figure 6 , which shows a schematic diagram of the structure of a signal receiving device provided in an embodiment of the present application. Figure 6 , the signal receiving device 500 Figure 3 The signal receiving device 200 shown further includes: PGA, AAF and Decimation Filter, and the functions of each of them are described above and will not be repeated here.

[0040] like Figure 7 As shown, this Figure 6 The schematic diagram of the working principle of the signal receiving device 500 shown in FIG. Figure 7 In the embodiment of the present application, when the signal receiving device 500 demodulates the received RF sig, at least one of "local oscillator leakage (LO leak, the frequency of the LO leak differs from the frequency of the RF sig by an intermediate frequency signal (IF))" and "self-mixing" may be formed at the LNA and the Mixer (for the sake of convenience, in Figure 7 In the example of only the existence of local oscillator leakage, this is not a limitation of the present application), which results in a DC offset in the low intermediate frequency analog signal (IF) output after the mixer demodulates the RF sig. The low intermediate frequency analog signal with the DC offset is converted into a low intermediate frequency digital signal with the DC offset by the ADC. stWhen the Complex Mixer demodulates the low intermediate frequency digital signal with DCOffset into a zero intermediate frequency digital signal (signal of 0Hz), it also transfers the DC Offset to the channel outside the BB sig. At this time, the DC Offset and BB sig are separated by one IF, and the DC Offset can be quickly filtered out through the ChannelFilter to obtain the BB sig. This effectively eliminates the influence of the DC Offset formed in the RF sig demodulation process on the correctness of demodulation.

[0041] also, Figure 1 (or Figure 2 ) has poor anti-interference ability. In a strong interference environment, the received signal strength indicator (RSSI) of the digital signal input to the DSP by the RDOC or HPF fluctuates greatly. The cluster application is prone to problems such as disconnection and cell mishandling, which directly affects the user experience. Figures 3 to 7 Based on the receiving device shown in the figure, the function of detecting the out-of-band energy of BB sig is added, and the frequency of the mixed frequency ALO sig of RF sig is adaptively adjusted according to the out-of-band energy detection of BB sig to eliminate the interference of out-of-band energy. The following is a specific description:

[0042] like Figure 8 , which shows a schematic diagram of the structure of a signal receiving device provided in an embodiment of the present application. Figure 8 , the signal receiving device 600 Figure 3 The signal receiving device 200 shown in the figure further includes: an interference detection module (OOB, Out of Band Power Monitoring Function, out-of-band energy detection function) and a processor (for example, Figure 8 The OOB is connected to the DSP in communication, and the DSP is connected to the A LO sig source (e.g. Figure 8 The OOB detects the out-of-band energy of the low intermediate frequency digital signal output by the ADC, and the processor (e.g., Figure 8 The DSP shown in FIG. 1 controls the analog LO sig source (eg, Figure 8 The PLL shown in (a) adjusts f1 of ALO sig.

[0043] Please continue to see Figure 8, OOB includes: a left adjacent channel detection submodule and a right adjacent channel detection submodule. Among them, the left adjacent channel detection submodule is used to detect the out-of-band energy in the left adjacent channel of the low intermediate frequency digital signal output by the ADC; the right adjacent channel detection submodule is used to detect the out-of-band energy in the right adjacent channel of the low intermediate frequency digital signal output by the ADC. Among them, the left adjacent channel is a channel whose channel frequency is lower than the channel where the BB sig is located; the right adjacent channel is a channel whose channel frequency is higher than the channel where the BB sig is located.

[0044] Please continue to see Figure 8 The left adjacent channel detection submodule includes: a second digital local oscillator signal source, a second digital mixer, a first low-pass filter, and a first energy detector. Figure 8 , the second digital local oscillator signal source, the second digital mixer, the first low-pass filter, and the first energy detector are sequentially the second D LO sig source (in Figure 8 Not shown), the second ComplexMixer (2 nd Complex Mixer), a first third-order infinite impulse low-pass filter (3rd IIR LPF, Third-order Infinite Impulse Response Low-Pass Filter), and a first energy detector (RSSI_Left, RSSI: Received Signal Strength Indicator, received signal strength indication).

[0045] Among them, 2 nd The Complex Mixer converts the second digital local oscillator signal (2 nd D LOsig, Second Digital Local Oscillator signal) is mixed with the low intermediate frequency digital signal output by the ADC to obtain a first initial zero intermediate frequency signal to be detected. Then, the first 3rd IIR LPF performs filtering processing on the first initial zero intermediate frequency signal to be detected, and filters out the signals except the left adjacent channel signal of BB sig in the first initial zero intermediate frequency signal to be detected, to obtain the first zero intermediate frequency signal to be detected. Then, RSSI_Left detects the first strength of the first zero intermediate frequency signal to be detected output by the first 3rd IIR LPF, and when it is detected that the first strength exceeds the first threshold, it sends a signal to the processor (for example Figure 8 ) transmits a first message to notify the processor (eg Figure 8 The DSP shown in FIG. 1 detects out-of-band energy in the left adjacent channel.

[0046] Please continue to see Figure 8The right adjacent channel detection submodule includes: a third digital local oscillator signal source, a third digital mixer, a second low-pass filter, and a second energy detector. Figure 8 , the third digital local oscillator signal source, the third digital mixer, the second low-pass filter, and the second energy detector are respectively the third D LO sig source (in Figure 8 Not shown), the third ComplexMixer (3 rd Complex Mixer), a second third-order infinite impulse low-pass filter (3rd IIR LPF), and a second energy detector (RSSI_Right).

[0047] Among them, 3 rd Complex Mixer converts the third digital local oscillator signal (3 rd D LOsig, Third Digital Local Oscillator signal) is mixed with the low intermediate frequency digital signal output by the ADC to obtain a second initial zero intermediate frequency signal to be detected. Then, the second 3rd IIR LPF filters the second initial zero intermediate frequency signal to be detected, and filters out the signals except the right adjacent channel signal of BB sig in the second initial zero intermediate frequency signal to be detected, to obtain a second zero intermediate frequency signal to be detected. Then, RSSI_Right detects the second strength of the second zero intermediate frequency signal to be detected output by the second 3rd IIR LPF, and when it is detected that the second strength exceeds the second threshold, it sends a signal to the processor (for example Figure 8 DSP shown in ) transmits a second message to notify the processor (eg Figure 8 The DSP shown in FIG. 1 detects out-of-band energy in the left adjacent channel.

[0048] The first threshold and the second threshold can be flexibly configured according to the requirements. For example, the first threshold and the second threshold are both 0, and the specific values ​​are not limited in this application.

[0049] 2 nd The third frequency f3 of D LO sig is 1 st D LO sig-f2 based on the preset frequency Δf Δ Up-conversion determined; 3 rd The fourth frequency f4 of D LO sig is 1 st D LO sig-f2 based on Δf Δ Determined by down conversion. For example, f3 = -f2 + Δf Δ , f4=-f2-Δf Δ .

[0050] In some optional embodiments, at least two of the first D LO sig source, the second D LO sig source and the third D LO sig source are of the same source. Fig. 9 FIG. 1 is a schematic diagram showing the structure of a signal receiving device provided in an embodiment of the present application. Fig. 9 ,exist Fig. 9 In the signal receiving device 700 shown, the first D LO sig source, the second D LO sig source and the third D LO sig source are all digital oscillators (NCO, Numerically Controlled Oscillator).

[0051] Please continue to see Figure 8 or Fig. 9 , the processor (for example Figure 8 or Fig. 9 The DSP shown in FIG. 1 controls the analog LO sig source (eg, Figure 8 or Fig. 9 The PLL shown in FIG. 1 adjusts f1 to f0 for up-conversion, that is, f1=f0-Δf is adjusted to f1=f0+Δf; or, a processor (e.g., Figure 8 or Fig. 9 The DSP shown in FIG. 1 controls the analog LO sig source (eg, Figure 8 or Fig. 9 The PLL shown in FIG. 1 adjusts f1 to f0 for down-conversion, that is, f1=f0+Δf is adjusted to f1=f0-Δf.

[0052] like Fig.10 , which shows a schematic diagram of the structure of a signal receiving device provided in an embodiment of the present application. Fig.10 , the signal receiving device 800 Figure 8 The signal receiving device 600 shown further includes: PGA and AAF, and the functions of each of them are described above and will not be repeated here.

[0053] like Fig.11 , which shows a schematic diagram of the structure of a signal receiving device provided in an embodiment of the present application. Fig.11 , the signal receiving device 900 Figure 8 The signal receiving device 600 shown in the figure further includes: a DecimationFilter, which downsamples the low intermediate frequency digital signal output by the ADC and inputs the downsampled low intermediate frequency digital signal into 1 stComplex Mixer and OOB. For example, the Decimation Filter inputs the downsampled low-IF digital signal into 1 st Complex Mixer, 2 nd Complex Mixer and 3 rd Complex Mixer.

[0054] like Fig.12 , which shows a schematic diagram of the structure of a signal receiving device provided in an embodiment of the present application. Fig.12 , the signal receiving device 1000 Figure 8 The signal receiving device 600 shown further includes: PGA, AAF and Decimation Filter, and the functions of each of them are described above and will not be repeated here.

[0055] like Fig.13 , which shows a schematic diagram of the structure of a signal receiving device provided in an embodiment of the present application. Fig.13 , the signal receiving device 1100 Fig.12 The signal receiving device 1000 shown further includes: NCO, and the respective functions thereof are described above and will not be described in detail here.

[0056] The present application provides a receiver, including the aforementioned Figures 2 to 13 At least one of the receiving devices shown in .

[0057] The present application also provides a signal adjustment method, such as Fig.14 As shown, the steps of the signal adjustment method provided by the embodiment of the present application are shown. Fig.14 The signal adjustment method is applied to any of the aforementioned receiving devices and receivers, and is used to adaptively adjust the aforementioned Figures 2 to 13 Any one of the receiving devices shown in the figure, the analog LO sig source in the receiver inputs f1 of the A LO sig of the mixer, the signal adjustment method comprises the following steps S101-S102:

[0058] S101, the processor determines the current frequency conversion state of the analog local oscillator signal input to the analog mixer when receiving the detection result of the interference detection module;

[0059] S102: The processor controls an analog local oscillator signal source to adjust a first frequency of the analog local oscillator signal according to the detection result and the current frequency conversion state.

[0060] In some optional implementations, step S102 includes:

[0061] When the interference detection module detects that there is out-of-band energy in the left adjacent channel of the channel where the baseband signal is located and the current frequency conversion state of the first frequency is down-conversion at the reference frequency, the analog local oscillator signal source is controlled to adjust the first frequency to up-conversion at the reference frequency; the left adjacent channel is a channel whose channel frequency is lower than the channel where the baseband signal is located;

[0062] or,

[0063] When the interference detection module detects that there is out-of-band energy in the right adjacent channel of the channel where the baseband signal is located and the current frequency conversion state of the first frequency is up-conversion with the reference frequency, the analog local oscillator signal source is controlled to adjust the first frequency to down-conversion with the reference frequency; the right adjacent channel is a channel whose channel frequency is higher than the channel where the baseband signal is located.

[0064] like Fig.15 As shown, it is shown Fig.13 The schematic diagram of the adjustment principle of f1 of the A LO sig of the mixer of the signal receiving device 1100 in FIG. Fig.13 and Fig.15 right Fig.14 The signal conditioning method shown is described below.

[0065] After the signal receiving device 1100 enters the power-on state, the default value of f1 of the ALO sig input to the Mixer is f1=f0-Δf, that is, the f1 of the ALO sig output by the PLL is determined after down-converting f0 by Δf. OOB detects the out-of-band energy of the low intermediate frequency digital signal output by the Decimation Filter in real time.

[0066] When f1 of ALO sig defaults to f1=f0-Δf, when the left adjacent channel detection submodule in OOB detects out-of-band energy, the PLL is controlled to adjust f1 of A LO sig from f1=f0-Δf to f1=f0+Δf, that is, f1 of A LO sig output by the PLL is adjusted from the frequency conversion state of down-converting f0 by Δf to up-converting f0 by Δf.

[0067] When f1 of ALO sig defaults to f1=f0-Δf, if the right adjacent channel detection submodule in OOB detects out-band energy or both the left adjacent channel detection submodule and the right adjacent channel detection submodule do not detect out-band energy, f1 of ALOsig remains f1=f0-Δf.

[0068] When f1 of A LO sig is adjusted to f1=f0+Δf, when the left adjacent channel detection submodule in OOB detects out-of-band energy or both the left adjacent channel detection submodule and the right adjacent channel detection submodule do not detect out-band energy, f1 of A LOsig remains f1=f1+Δf.

[0069] When f1 of A LO sig is adjusted to f1=f0+Δf, when the right adjacent channel detection submodule in OOB detects out-of-band energy, the PLL is controlled to adjust f1 of A LO sig from f1=f0+Δf to f1=f0-Δf, that is, f1 of A LO sig output by the PLL is adjusted from the frequency conversion state of up-converting f0 by Δf to down-converting f0 by Δf.

[0070] In the embodiment of the present application, the function of out-of-band energy detection of BB sig is added, that is, the out-of-band energy of BB sig is detected through OOB, and the frequency of the mixed frequency ALO sig of RF sig is adaptively adjusted according to the out-of-band energy detection of BB sig by OOB, which can effectively eliminate the interference of out-of-band energy.

[0071] based on Fig.13 The signal receiving device 1100 shown in FIG. Figure 1 (or Fig.12 ) was tested against the signal receiving device 100 shown in FIG. 1 , and it can be seen that the signal receiving device 1100 provided in the embodiment of the application effectively improves the anti-strong interference performance. The specific measured data are shown in Table 1. Under the conditions of registration amplitudes of -80dBm, -90dBm, and -100dBm, the RSSI (RSSI of the signal finally input to the DSP) of the signal receiving device 1100 has a small fluctuation amplitude and is more stable. The specific measured data are shown in Table 2. The anti-adjacent channel interference performance of the signal receiving device 1100 is also greatly improved. The specific measured data are shown in Table 3. The signal receiving device 1100 greatly improves the RSSI stability and anti-adjacent channel interference capability of the signal receiving device, thereby improving the actual experience of users on the electronic equipment or terminal using the signal receiving device provided in the embodiment of the present application, and improving the competitiveness of the product in the market.

[0072] Table 1 Comparison of strong signal interference resistance

[0073]

[0074]

[0075] Table 2 RSSI stability ratio

[0076]

[0077]

[0078]

[0079]

[0080]

[0081] Table 3 Anti-adjacent channel interference comparison test data

[0082]

[0083] The signal conditioning method provided in the embodiment of the present application may be executed by a signal conditioning device. In the embodiment of the present application, the signal conditioning device provided in the embodiment of the present application is described by taking the method for the signal conditioning device to perform signal conditioning as an example.

[0084] The signal conditioning device 1600 in the embodiment of the present application can be an electronic device, or a component in the electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal, or other devices other than a terminal. Exemplarily, the electronic device can be a walkie-talkie, a mobile phone, a tablet computer, a laptop computer, a PDA, a vehicle-mounted electronic device, a mobile Internet device (Mobile Internet Device, MID), an augmented reality (augmented reality, AR) / virtual reality (virtual reality, VR) device, a robot, a wearable device, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a netbook or a personal digital assistant (personal digital assistant, PDA), etc., and can also be a server, a network attached storage (Network Attached Storage, NAS), a personal computer (personal computer, PC), a television (television, TV), a teller machine or a self-service machine, etc., which is not specifically limited in the embodiment of the present application.

[0085] The signal conditioning device 1600 provided in the embodiment of the present application can achieve Figure 14 to Figure 15 To avoid repetition, the various processes implemented by the method embodiment are not described here.

[0086] It should be noted that the electronic devices in the embodiments of the present application include the above-mentioned mobile electronic devices and non-mobile electronic devices.

[0087] Fig.16 A schematic diagram of the hardware structure of an electronic device to implement an embodiment of the present application.

[0088] The electronic device 140 includes, but is not limited to, components such as a radio frequency unit 141, a network module 142, an audio output unit 143, an input unit 144, a sensor 145, a display unit 146, a user input unit 147, an interface unit 148, a memory 149, and a processor 1410. Those skilled in the art will appreciate that the electronic device 140 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 1410 through a power management system, so as to implement functions such as managing charging, discharging, and power consumption management through the power management system. Fig.10 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.

[0089] The processor 1410 is configured to:

[0090] Determine the current frequency conversion state of the analog local oscillator signal input to the analog mixer in the signal receiving device when receiving the detection result of the out-of-band energy of the low intermediate frequency digital signal output by the analog-to-digital converter in the signal receiving device;

[0091] According to the detection result and the current frequency conversion state, the analog local oscillator signal source in the signal detection device is controlled to adjust the first frequency of the analog local oscillator signal outputted by itself.

[0092] It should be understood that in the embodiment of the present application, the RF unit 141 may include the aforementioned Figures 2 to 13 Any signal receiving device.

[0093] The input unit 144 may include a graphics processing unit (GPU) 1441 and a microphone 1442, and the graphics processor 1441 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 146 may include a display panel 1461, and the display panel 1461 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 147 includes a touch panel 1471 and at least one of other input devices 1472. The touch panel 1471 is also called a touch screen. The touch panel 1471 may include two parts: a touch detection device and a touch controller. Other input devices 1472 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.

[0094] The memory 149 can be used to store software programs and various data. The memory 149 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 149 may include a volatile memory or a non-volatile memory, or the memory 149 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 149 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0095] The processor 1410 may include one or more processing units; optionally, the processor 1410 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 1410.

[0096] Any of the above-mentioned product embodiments can implement the various processes of the above-mentioned signal adjustment method embodiments through its own processor operation, and can achieve the same technical effect. In order to avoid repetition, they will not be described one by one.

[0097] In the implementation methods provided in the embodiments of the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device implementation methods described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0098] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0099] In addition, each functional unit in each implementation of the embodiment of the present application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of software functional units.

[0100] The above description is only an implementation method of the embodiment of the present application, and does not limit the patent scope of the embodiment of the present application. The above specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can make many forms of equivalent structures or equivalent process changes made by using the description and drawings of the embodiment of the present application, or directly or indirectly apply them in other related technical fields without departing from the scope of protection of the purpose of the present application and the claims, which are also included in the patent protection scope of the embodiment of the present application.

Claims

1. A signal receiving device, characterized in that: include: A low noise amplifier, used to amplify the received radio frequency signal; An analog local oscillator signal source, used for outputting an analog local oscillator signal; an analog mixer, used for mixing the amplified radio frequency signal and the analog local oscillator signal to obtain a low intermediate frequency analog signal; An analog-to-digital converter, used for converting the low intermediate frequency analog signal into a low intermediate frequency digital signal; A first digital local oscillator signal source, used to output a first digital local oscillator signal; A first digital mixer, configured to mix the low intermediate frequency digital signal and the first digital local oscillator signal to obtain a zero intermediate frequency digital signal; The channel filter is used to filter out the DC offset in the zero intermediate frequency digital signal to obtain a baseband signal.

2. The signal receiving device according to claim 1, characterized in that: The first frequency of the analog local oscillator signal is determined by converting the reference frequency according to the frequency conversion frequency, and the frequency conversion frequency is determined according to the second frequency of the first digital local oscillator signal.

3. The signal receiving device according to claim 1, characterized in that: Also includes: An interference detection module, used for detecting out-of-band energy of the low intermediate frequency digital signal; The processor is used to control the analog local oscillator signal source to adjust the first frequency of the analog local oscillator signal according to the detection result of the interference detection module and the current frequency conversion state of the analog local oscillator signal.

4. The signal receiving device according to claim 3, characterized in that: The interference detection module comprises: a left adjacent channel detection submodule, configured to detect out-of-band energy in the left adjacent channel of the baseband signal; wherein the processor is configured to control the analog local oscillator signal source to adjust the first frequency to the reference frequency up-conversion when the left adjacent channel detection submodule detects the out-of-band energy and the current frequency conversion state of the first frequency is the reference frequency down-conversion; The right adjacent channel detection submodule is used to detect out-of-band energy in the right adjacent channel of the baseband signal; the processor is used to control the analog local oscillator signal source to adjust the first frequency to the reference frequency down-conversion when the right adjacent channel detection submodule detects the out-band energy and the current frequency conversion state of the first frequency is the reference frequency up-conversion.

5. The signal receiving device according to claim 4, characterized in that: The left adjacent channel detection submodule includes: A second digital local oscillator signal source, used for outputting a second digital local oscillator signal, wherein a third frequency of the second digital local oscillator signal is determined by up-converting the second frequency of the first digital local oscillator signal according to a preset frequency; A second digital mixer is used to mix the low intermediate frequency digital signal and the second digital local oscillator signal to obtain a first initial zero intermediate frequency detection signal; A first low-pass filter is used to filter out signals other than the left adjacent channel signal of the baseband signal from the first initial zero intermediate frequency signal to be detected, so as to obtain a first zero intermediate frequency signal to be detected; a first energy detector, configured to detect a first strength of the first zero intermediate frequency detection signal, and transmit a first message to the processor to notify the processor that out-of-band energy is detected in the left adjacent channel when detecting that the first strength exceeds a first threshold; And / or, the right adjacent channel detection submodule includes: A third digital local oscillator signal source, used for outputting a third digital local oscillator signal, wherein a fourth frequency of the third digital local oscillator signal is determined by down-converting the second frequency of the first digital local oscillator signal according to a preset frequency; A third digital mixer is used to mix the low intermediate frequency digital signal and the third digital local oscillator signal to obtain a second initial zero intermediate frequency detection signal; A second low-pass filter is used to filter out signals other than the left adjacent channel signal of the baseband signal in the second initial zero intermediate frequency signal to be detected, so as to obtain a second zero intermediate frequency signal to be detected; The second energy detector is used to detect a second strength of the second zero-IF signal to be detected, and when it is detected that the second strength exceeds a second threshold, transmit a second message to the processor to notify the processor that out-of-band energy is detected in the right adjacent channel.

6. The signal receiving device according to claim 3, characterized in that: Also includes: A decimation filter is used to down-sample the low intermediate frequency digital signal output by the analog-to-digital converter, and input the down-sampled low intermediate frequency digital signal into the first digital mixer and the interference detection module.

7. The signal receiving device according to any one of claims 1 to 6, characterized in that: Also includes: An automatic gain controller, used for stabilizing the amplitude of the low intermediate frequency analog signal output by the analog mixer; The anti-aliasing filter is used to perform anti-aliasing filtering on the low intermediate frequency analog signal after amplitude stabilization, and input the filtered low intermediate frequency analog signal into the analog-to-digital converter.

8. A receiver, characterized in that: A signal receiving device comprising the signal receiving device according to any one of claims 1 to 7.

9. A signal conditioning method, characterized in that: Applied to the signal receiving device of claim 3, the signal adjustment method comprises: The processor determines the current frequency conversion state of the analog local oscillator signal input to the analog mixer when receiving the detection result of the interference detection module; The processor controls the analog local oscillator signal source to adjust the first frequency of the analog local oscillator signal according to the detection result and the current frequency conversion state.

10. The signal conditioning method according to claim 9, characterized in that: The processor controls the analog local oscillator signal source to adjust the first frequency of the analog local oscillator signal according to the detection result and the current frequency conversion state, including: When the interference detection module detects that there is out-of-band energy in the left adjacent channel of the channel where the baseband signal is located and the current frequency conversion state of the first frequency is down-conversion of the reference frequency, control the analog local oscillator signal source to adjust the first frequency to up-conversion of the reference frequency; or, When the interference detection module detects that there is out-of-band energy in the right adjacent channel of the channel where the baseband signal is located and the current frequency conversion state of the first frequency is up-conversion with the reference frequency, the analog local oscillator signal source is controlled to adjust the first frequency to down-conversion with the reference frequency; the right adjacent channel is a channel whose channel frequency is higher than the channel where the baseband signal is located.

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