CN116208181B - Multi-carrier receiving method and multi-carrier receiver - Google Patents
Multi-carrier receiving method and multi-carrier receiver Download PDFInfo
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- CN116208181B CN116208181B CN202111445564.2A CN202111445564A CN116208181B CN 116208181 B CN116208181 B CN 116208181B CN 202111445564 A CN202111445564 A CN 202111445564A CN 116208181 B CN116208181 B CN 116208181B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 230000011664 signaling Effects 0.000 claims 4
- 238000010586 diagram Methods 0.000 description 13
- YBIDYTOJOXKBLO-USLOAXSXSA-N (4-nitrophenyl)methyl (5r,6s)-6-[(1r)-1-hydroxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate Chemical compound C([C@@H]1[C@H](C(N11)=O)[C@H](O)C)C(=O)C1C(=O)OCC1=CC=C([N+]([O-])=O)C=C1 YBIDYTOJOXKBLO-USLOAXSXSA-N 0.000 description 4
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/0057—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/006—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The application discloses a multi-carrier receiving method and a multi-carrier receiver, wherein the multi-carrier receiver comprises a signal processing circuit and a plurality of receiving circuits, the receiving circuits comprise a processing circuit and a filtering switching circuit, the processing circuit carries out down-conversion on multi-carrier signals to obtain intermediate frequency signals, the filtering switching circuit comprises a selection circuit and a plurality of filters, the filtering bandwidths of the filters are different, the selection circuit selects one filter to filter the intermediate frequency signals, the signal processing circuit detects whether strong carrier signals exist in the multi-carrier signals, and when the strong carrier signals exist in the multi-carrier signals, the selection circuit in at least two receiving circuits is controlled to select one filter to be connected with the processing circuit, so that the strong carrier signals and other carrier signals in the multi-carrier signals are respectively filtered through different filters, and the strong carrier signals are carrier signals with signal strengths larger than preset signal strengths. By the mode, the dynamic range of the receiver can be improved.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a multi-carrier receiving method and a multi-carrier receiver.
Background
The wideband multicarrier receiver has great advantages in terms of circuit miniaturization, cost control, intermediate frequency planning, etc., but is limited by specification limitations such as signal-to-noise ratio (Signal to Noise Ratio, SNR) of the analog-to-digital converter (Analog to Digital Converter, ADC), spurious-free dynamic range (Spurious FREE DYNAMIC RANGE, SFDR), etc., the dynamic range of the receiver is much lower than that of the superheterodyne receiver, and is susceptible to in-band interference signals.
Disclosure of Invention
The application provides a multi-carrier receiving method and a multi-carrier receiver, which can improve the dynamic range of the receiver.
The multi-carrier receiver comprises a signal processing circuit and a plurality of receiving circuits, wherein each receiving circuit comprises a processing circuit and a filtering switching circuit which are connected with each other, the processing circuit is used for carrying out down-conversion on multi-carrier signals to obtain intermediate frequency signals, the filtering switching circuit comprises a selection circuit and a plurality of filters, the filtering bandwidths of the filters are different, the selection circuit is used for selecting one of the filters from the filters to filter the intermediate frequency signals to obtain filtered signals, the signal processing circuit is respectively connected with each receiving circuit and used for detecting whether strong carrier signals exist in the multi-carrier signals, and when the strong carrier signals exist in the multi-carrier signals, the selection circuit in at least two receiving circuits is controlled to select one of the filters to be connected with the processing circuit, so that the strong carrier signals and other carrier signals in the multi-carrier signals are respectively filtered through the different filters, and the strong carrier signals are carrier signals with signal intensities larger than preset signal intensities.
In order to solve the technical problems, the application provides a multi-carrier receiving method which is applied to a multi-carrier receiver, wherein the multi-carrier receiver comprises a signal processing circuit and a plurality of receiving circuits respectively connected with the signal processing circuit, each receiving circuit comprises a processing circuit and a filtering switching circuit which are mutually connected, the filtering switching circuit comprises a selecting circuit and a plurality of filters, the filtering bandwidths of the filters are different, the method comprises the steps of performing down-conversion on a multi-carrier signal by the processing circuit to obtain an intermediate frequency signal, filtering the intermediate frequency signal by the selecting circuit from one of the filters to obtain a filtering signal, detecting whether a strong carrier signal exists in the multi-carrier signal by the signal processing circuit, and controlling the selecting circuit in at least two receiving circuits to select one of the filters to be connected with the processing circuit when the strong carrier signal exists in the multi-carrier signal, so that the strong carrier signal and other carrier signals in the multi-carrier signal respectively enter different filters, wherein the strong carrier signal is the carrier signal with the signal strength larger than the preset signal strength.
The multi-carrier receiver comprises a signal processing circuit and a plurality of receiving circuits, wherein each receiving circuit comprises a processing circuit and a filtering switching circuit, the processing circuit performs down-conversion on multi-carrier signals to obtain corresponding intermediate frequency signals, the filtering switching circuit comprises a selecting circuit and a plurality of filters with different filtering bandwidths, the selecting circuit selects one filter from all the filters to enable the filters to filter the intermediate frequency signals to obtain filtering signals, when strong carrier signals with signal strength larger than preset signal strength exist in the multi-carrier signals, the signal processing circuit controls the selecting circuit in at least two receiving circuits to enable the selecting circuit to select the corresponding filters to be connected with the processing circuit, and further enable other carrier signals in the strong carrier signals and the multi-carrier signals to enter different filters respectively.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
Fig. 1 is a schematic structural diagram of an embodiment of a multicarrier receiver according to the present application;
fig. 2 is a schematic diagram of a receiving circuit according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of another embodiment of a multicarrier receiver according to the present application;
fig. 4 is a schematic diagram of a processing circuit, a filtering switching circuit and a signal processing circuit according to the present application;
fig. 5 is a schematic diagram of the frequency and signal strength of 4 carrier signals provided by the present application;
Fig. 6 is a schematic diagram of demodulating the 4 carrier signals shown in fig. 5;
Fig. 7 is another schematic diagram of the frequency and signal strength of 4 carrier signals according to the present application;
fig. 8 is another schematic diagram of demodulating the 4 carrier signals shown in fig. 5;
fig. 9 is a further schematic diagram of demodulating the 4 carrier signals shown in fig. 5;
Fig. 10 is a flowchart of an embodiment of a multi-carrier receiving method according to the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Taking a 350MHz all-in-one machine as an example, the in-band blocking index can meet the 84dB industry requirement, but because the transmitting power of the interphone is larger, the input level of the base station receiver is far higher than-23 dBm when in short-distance communication, and the signal strength is higher than 0dBm in extreme cases. When a strong signal is received, for example, one carrier signal f1 has a power of-120 dBm and the other carrier signal f2 has a power of-10 dBm, the link gain is reduced due to the carrier signal f2 with a larger signal strength, so that the ADC cannot demodulate the carrier signal f1 with a low power of-120 dBm.
In order to demodulate a low-power signal and improve the dynamic range of a multi-carrier receiver in the presence of a strong signal, the present application provides a new scheme, and the new scheme is described in detail below.
Referring to fig. 1 and 2, fig. 1 is a schematic diagram of a multicarrier receiver according to an embodiment of the present application, and fig. 2 is a schematic diagram of a receiving circuit according to an embodiment of the present application, wherein the multicarrier receiver includes a plurality of receiving circuits 10 and a signal processing circuit 20, and each receiving circuit 10 includes a processing circuit 11 and a filtering switching circuit 12 connected to each other.
The processing circuit 11 is configured to obtain a carrier signal and perform down-conversion on the multi-carrier signal to obtain an intermediate frequency signal, where the multi-carrier signal includes a plurality of carrier signals, a frequency difference value of the plurality of carrier signals may be a fixed value, the carrier signals are radio frequency signals, and the processing circuit 11 may perform mixing processing on the radio frequency signals to implement down-conversion.
The filter switching circuit 12 includes a selection circuit 122 and a plurality of filters 121, wherein the plurality of filters 121 have different filter bandwidths, and the selection circuit 122 is configured to select one filter 121 from the plurality of filters 121 to filter the intermediate frequency signal to obtain a filtered signal; specifically, the bandwidth of the filter 121 with the widest bandwidth in the plurality of filters 121 is greater than the signal bandwidth of the multi-carrier signal, the filter 121 may be a band-pass filter (Bandpass filter, BPF), each filter 121 is connected with the selection circuit 122, and different filtering bandwidths may be selected for the plurality of filters 121 according to the need or the frequency of the carrier signal, for example, the number of carrier signals is 2, 2 filters 121 are set in each filtering switching circuit 12, the filtering bandwidths of which are respectively 500KHz and 2MHz, or the number of carrier signals is greater than 2, the frequency interval between the carrier signal with the highest frequency and the carrier signal with the lowest frequency is 250KHz, at this time, 3 filters 121 may be set in each filtering switching circuit 12, and recorded as F1, F2 and F3, the bandwidths of the filters F1 are smaller than the frequency interval between the carrier signals with the adjacent frequency, namely, the filter F2 is smaller than 250KHz, the frequency interval between the carrier signals with the highest frequency and the carrier signal with the lowest frequency is greater than 1 to the frequency 1, the carrier signal with the frequency interval between the carrier signal with the highest frequency is 1 and the carrier signal with the lowest frequency is 1 to the frequency 1, the frequency interval between the carrier signal with the highest frequency and the carrier signal with the frequency being greater than the frequency 1 to the frequency 1, and the carrier signal with the frequency 1 is equal to the frequency 1, and the frequency band between the carrier signal with the largest frequency and the carrier signal with the frequency is set as the frequency interval between the carrier signal with the largest frequency and the carrier signal is 1 and the carrier signal with the frequency 1 and the frequency 1 is 1 and the largest frequency and the carrier signal is shown as the frequency bandwidth is 1, without limiting the application, the specific values of the bandwidths of the individual filters 121 may be set according to the specific application needs.
Further, in the initial state, a certain filter 121 in the default filter switching circuit 12 may be connected to the processing circuit 11 and the signal processing circuit 20 through the selection circuit 122, for example, assuming that the receiving circuit 10 includes 4 filters 121, a default fourth filter 121 is connected to the processing circuit 11 and the signal processing circuit 20. It will be appreciated that the number of filters 121 or the default connection of filters 121 in each receiving circuit 10 may be different, e.g. in a first receiving circuit 10a default second filter 121 is connected to the processing circuit 11 and the signal processing circuit 20, and in a second receiving circuit 10a default third filter 121 is connected to the processing circuit 11 and the signal processing circuit 20. Here, the default filter 121 is a wide bandwidth filter having a filtering bandwidth larger than the frequency interval between the carrier signal having the highest frequency and the carrier signal having the lowest frequency, and for example, the bandwidth of the wide bandwidth filter may be 1MHz, with the number of carrier signals being 4 and the frequency interval of the carrier signal being 250 KHz.
The signal processing circuit 20 is respectively connected to each of the receiving circuits 10, and is configured to detect whether a strong carrier signal exists in the multi-carrier signal, and when the strong carrier signal exists in the multi-filter signal, control the selection circuit 122 in at least two receiving circuits 10 to select one of the filters 121 to be connected to the processing circuit 11, so that the strong carrier signal and other carrier signals in the multi-carrier signal are respectively filtered by different filters 121, where the other carrier signals are carrier signals except for the strong carrier signal in the multi-carrier signal, and the strong carrier signal is a carrier signal with a signal strength greater than a preset signal strength, and the preset signal strength may be a signal strength threshold set according to experience or application requirements, for example, -30dBm. Specifically, the detection of the signal strength of the multi-carrier signal is substantially that of the signal strength of the filtered signal output by the receiving circuit 10, that is, the signal processing circuit 20 detects the signal strength of the filtered signal after receiving the filtered signal output by the receiving circuit 10, compares the signal strength of the filtered signal with a preset signal strength, if it is determined that the signal strength of the filtered signal is greater than the preset signal strength, it indicates that one signal with greater signal strength exists in the received multiple carrier signals, and in order to reduce the influence of the strong signal on other carrier signals, the signal processing circuit 20 generates a control signal, and sends the control signal to the filter switching circuit 12 to switch the filter 121 for filtering the intermediate frequency signal in the filter switching circuit 12.
Further, in detecting whether or not a strong carrier signal is present in the multi-carrier signal, an appropriate filter 121 may be selected according to a frequency interval between a highest frequency of the carrier signal and a lowest frequency of the carrier signal, for example, assuming that the frequency interval between the highest frequency and the lowest frequency is about 1MHz, the multi-carrier signal may be filtered using the filter 121 having a filter bandwidth of 1 MHz.
In the existing intermediate frequency receiving circuit design, the filter in the intermediate frequency receiving circuit is a broadband filter, and has no inhibition effect on in-band useful or interference signals, while the scheme provided by the embodiment designs a plurality of filters with different filtering bandwidths on the intermediate frequency receiving path, selects a proper filter to filter the intermediate frequency signals according to the signal strength of carrier signals in the multi-carrier signals and the bandwidths of the carrier signals, plays a certain inhibition effect (more than 30 dB) on signals outside the passband of the filter, reduces the influence of the interference signals, can improve the dynamic range of the receiver, better satisfies the application scenes such as vehicle-mounted or portable, and improves the applicability of products.
Referring to fig. 3, fig. 3 is a schematic diagram of a multicarrier receiver according to another embodiment of the present application, where the multicarrier receiver includes a plurality of receiving circuits 10, a signal processing circuit 20 and an antenna 30.
The antenna 30 is connected to the plurality of receiving circuits 10, respectively, for transmitting the received multicarrier signals to the plurality of receiving circuits 10.
Each receiving circuit 10 is connected to an antenna 30, which includes a processing circuit 11, a filter switching circuit 12, and an ADC 13.
The processing circuit 11 is configured to down-convert the multi-carrier signal to obtain an intermediate frequency signal. Specifically, as shown in fig. 4, the processing circuit 11 includes a first amplifier 111, a digital step attenuator (DIGITAL STEP Attenuator, DSA) 112, a fourth filter 113, a second amplifier 114, a fifth filter 115, a local oscillator 116, and a mixer 117, where the first amplifier 111 is connected to the antenna 30 and may be a low noise amplifier (Low Noise Amplifier, LNA) for amplifying a carrier signal, the DSA 112 attenuates the carrier signal output by the first amplifier 111, the fourth filter 113 filters the carrier signal output by the DSA 112, the second amplifier 114 amplifies the carrier signal output by the fourth filter 113, the fifth filter 115 filters the carrier signal output by the second amplifier 114, the local oscillator 116 is used for generating a local oscillation signal, and the mixer 117 is used for mixing the local oscillation signal with the carrier signal output by the fifth filter 115 to obtain an intermediate frequency signal.
In other embodiments, the local oscillator 116 may be shared by multiple receiving circuits 10, that is, the local oscillator 116 is connected to the mixer 117 in each processing circuit 11, so that the local oscillator 116 is used to generate the local oscillation signal, which helps to reduce the overall size of the circuit and reduce the cost.
The filter switching circuit 12 includes a plurality of filters 121 having different filter bandwidths and a selection circuit 122, and the selection circuit 122 includes a first selection circuit 1221 and a second selection circuit 1222.
The first selection circuit 1221 is connected to the processing circuit 11 and the signal processing circuit 20, and is configured to, after receiving the first control signal output by the signal processing circuit 20, select a filter 121 corresponding to the first control signal to connect to the filter 121 and transmit the intermediate frequency signal to the filter 121, so that the filter 121 filters the intermediate frequency signal to obtain a filtered signal.
The second selection circuit 1222 is connected to the signal processing circuit 20, and is configured to select the filter 121 corresponding to the first control signal to be connected to the signal processing circuit 20 after receiving the second control signal output from the signal processing circuit 20, that is, the filter 121 selected by the first selection circuit 1221 is the same as the filter 121 selected by the second selection circuit 1222, so as to transmit the filtered signal filtered by the filter 121 to the signal processing circuit 20.
Further, as shown in fig. 4, the first selection circuit 1221 is a first single-pole multi-throw switch, which includes a first input end and a plurality of first output ends (not shown in the figure), the first input end is connected to the processing circuit 11, the plurality of first output ends are respectively connected to the filters 121, i.e. the plurality of first output ends are in one-to-one correspondence with the plurality of filters 121, the second selection circuit 1222 is a second single-pole multi-throw switch, which includes a plurality of second input ends and a second output end (not shown in the figure), the plurality of second input ends are respectively connected to the filters 121, i.e. the plurality of second input ends are respectively in one-to-one correspondence with the plurality of filters 121, and the second output ends are connected to the signal processing circuit 20. It should be understood that fig. 4 illustrates the number of filters 121 as 3, but the number of filters 121 may be set according to specific needs.
The ADC 13 is configured to perform analog-to-digital conversion on the filtered signal to obtain a digital signal, where the digital signal is a digital intermediate frequency signal.
In other embodiments, as shown in fig. 4, the receiving circuit 10 further includes a third amplifier 14 and a sixth filter 15, which are disposed between the filter switching circuit 12 and the ADC 13, the third amplifier 14 may be an adjustable gain amplifier (Variable GAIN AMPLIFIER, VGA) to amplify the filtered signal, and the sixth filter 15 may be a BPF to filter the filtered signal output by the VGA to filter the interference signal.
The signal processing circuit 20 is connected to the receiving circuit 10, and is configured to detect the signal strength of the carrier signal, and when the signal strength of the carrier signal is greater than the preset signal strength, the control processing circuit 11 is connected to the corresponding filter 121, so that the strong carrier signal and other carrier signals in the multi-carrier signal are filtered by different filters 121 respectively. Specifically, the signal processing circuit 20 is a digital processing chip, as shown in fig. 4, which is connected to the ADC 13 and the selection circuit 122, and is used to identify the signal strength of the digital signal.
The signal processing circuit 20 is further configured to determine whether the frequency of the strong carrier signal is the minimum value or the maximum value of the frequency of the carrier signal in the multi-carrier signal, obtain a determination result, and control the filter switching circuit 12 based on the determination result.
Further, the signal processing circuit 20 is configured to, when the frequency of the strong carrier signal is determined to be the minimum value or the maximum value of the frequency of the carrier signal in the multi-carrier signal, control the selection circuit 122 in one of the receiving circuits 10 to select the filter 121 with the widest bandwidth from the plurality of filters 121 to be connected to the processing circuit 11, obtain the filtered signal corresponding to the strong carrier signal, and control the selection circuit 122 in the other receiving circuit 10 to select the filter 121 matched with the bandwidth of the other carrier signal in the multi-carrier signal from the plurality of filters 121 to be connected to the processing circuit 11, obtain the filtered signal corresponding to the other carrier signal in the multi-carrier signal.
In a specific embodiment, the plurality of receiving circuits 10 includes a first receiving circuit and a second receiving circuit (not shown in the figure), the plurality of filters 121 with different filter bandwidths include a first filter and a second filter (not shown in the figure), the filter bandwidth of the first filter is greater than that of the second filter, the first receiving circuit is used for demodulating the strong carrier signal, the signal processing circuit 20 is used for controlling the processing circuit 11 in the first receiving circuit to be connected with the first filter in the first receiving circuit, the second receiving circuit is used for demodulating at least part of the carrier signal except the strong carrier signal, and the signal processing circuit 20 is used for controlling the processing circuit 11 in the second receiving circuit to be connected with the second filter in the second receiving circuit. In another specific embodiment, the plurality of receiving circuits 10 further includes a third receiving circuit (not shown in the figure), the plurality of filters 121 with different filter bandwidths further includes a third filter (not shown in the figure), the filter bandwidth of the second filter is greater than the filter bandwidth of the third filter, the carrier signal with a frequency greater than the frequency of the strong carrier signal in the multi-carrier signal is denoted as a first carrier signal, and the carrier signal with a frequency less than the frequency of the strong carrier signal in the multi-carrier signal is denoted as a second carrier signal. The signal processing circuit 20 is further configured to control the selection circuit 122 in one of the receiving circuits 10 (i.e., the first receiving circuit) to select a filter 121 matching the bandwidth of the first carrier signal from among the second filter and the third filter to be connected to the processing circuit 11, to obtain a filtered signal corresponding to the first carrier signal, and to control the selection circuit 122 in the other of the receiving circuits 10 (i.e., the second receiving circuit) to select the first filter to be connected to the processing circuit 11, to obtain a filtered signal corresponding to the strong carrier signal, and to control the selection circuit 122 in the other of the receiving circuits 10 (i.e., the third receiving circuit) to select the filter 121 matching the bandwidth of the second carrier signal from among the first filter and the second filter to be connected to the processing circuit 11, to obtain a filtered signal corresponding to the second carrier signal, when the frequency of the strong carrier signal is not the minimum value or the maximum value of the frequencies of the carrier signals in the multi-carrier signal.
In other specific embodiments, the signal processing circuit 20 is further configured to control the selection circuit 122 in one of the receiving circuits 10 to select a filter with the widest bandwidth from the plurality of filters to connect with the processing circuit 11 when no strong carrier signal exists in the multi-carrier signal, so as to obtain a filtered signal corresponding to the multi-carrier signal.
It will be appreciated that the number of the receiving circuits 10 is determined by the number of carrier signals and the number of demodulation signals to be obtained, for example, the number of carrier signals is greater than 3, and the number of the receiving circuits 10 is at least 3 and less than or equal to the number of carrier signals, and if only for separating the strong signal from other carrier signals, the number of demodulation signals is at most 3, and at this time, only 3 receiving circuits 10 may be provided, and if for demodulating each carrier signal of different frequency bands in the strong signal and other carrier signals or other carrier signals, respectively, more receiving circuits 10 need to be provided to obtain the corresponding number of demodulation signals.
In other specific embodiments, the plurality of receiving circuits 10 further includes a fourth receiving circuit (not shown in the figure), and the fourth receiving circuit is connected to the signal processing circuit 20, and is used for scanning and monitoring whether a strong carrier signal exists, and feeding back to the processing circuit 20, and the working principle of the first to fourth receiving circuits is specifically described below.
In a specific embodiment, taking a four-carrier base station with a frequency interval of 250KHz as an example, that is, the multi-carrier signal includes 4 carrier signals, the frequency interval of two adjacent carrier signals is 250KHz, it is assumed that 1 path of strong signal appears at a certain moment on the receiving side, four signal combinations shown in fig. 5 are combined, the filtering bandwidth of the first filter is 5MHz, the filtering bandwidth of the second filter is 1MHz, and the filtering bandwidth of the third filter is 150KHz. To simplify the description of the signal reception process, combination 1 and combination 4 may be classified into the same class (combination a), and combination 2 and combination 3 may be classified into the same class (combination B).
In the initial state, the first to fourth receiving circuits are connected to the processing circuit 11 and the signal processing circuit 20 through the selection circuit 122, that is, the filter with a wider bandwidth (that is, the second filter) is selected for filtering, the four-way receiving circuit receives the multi-carrier signal and the second filter can ensure the integrity of the received carrier signal, and then the signal processing circuit 20 detects the signal strength of the carrier signal and determines whether to switch the filters in the first to third receiving circuits according to the signal strength of the carrier signal, which is described in the following specific processing procedure.
(1) Normal reception mode without strong signal
Fig. 6 shows that fig. 6 is a simplified diagram of fig. 3, omitting other circuit elements except the filter and the signal processing circuit in fig. 3, the RXD2 receiving channel where the fourth receiving circuit (not shown) is used for scanning and monitoring whether there is a strong carrier signal, and filtering is performed by using the second filter, that is, using a filter with a wider bandwidth, so that all carrier signals can be ensured to pass, when there is no strong carrier signal, for example, as shown in fig. 7, the signal intensities corresponding to the carrier signals f1-f4 are all smaller than the preset signal intensity, the 4 carrier signals are demodulated in the normal receiving mode, the carrier signals are demodulated by the RX-Main receiving channel where the first receiving circuit is located, and filtering is performed by using the first filter, so as to ensure that more carrier signals pass, and improve the sensitivity of the receiver.
(2) Combination A reception mode
In fig. 8, the RX d2 receiving channel in which the fourth receiving circuit is located is used for scanning and monitoring whether a strong carrier signal exists, and filtering is performed by using a second filter, taking the combination 1 shown in fig. 5 as an example, when the strong carrier signal appears, the 4 carrier signals are respectively demodulated by different receiving channels, the strong carrier signal f1 enters the RX Main receiving channel in which the first receiving circuit is located for demodulation, the first filter is selected, the carrier signals f2-f4 are demodulated by the RX d0 receiving channel in which the second receiving circuit is located, and filtering is performed by using the second filter, so as to ensure that the carrier signals f2-f4 can pass through.
(3) Combination B reception mode
In fig. 9, the RX d2 receiving channel where the fourth receiving circuit is located is used for scanning to monitor whether there is a strong carrier signal, and filtering is performed by using a second filter, in the case of the combination 2 shown in fig. 5, when the strong carrier signal occurs, the 4 carrier signals are demodulated by different receiving channels, the normal carrier signal f1 enters the RX Main receiving channel where the first receiving circuit is located for demodulation, and filtering is performed by using a third filter to filter out other carrier signals, so as to reduce interference, the strong carrier signal f2 enters the RXD0 receiving channel where the second receiving circuit is located for processing, and filtering is performed by using the first filter, and the normal carrier signals f3-f4 enter the RXD1 receiving channel where the third receiving circuit is located for demodulation, and filtering is performed by using the second filter, so as to ensure that the carrier signals f3-f4 can pass through.
The technical scheme provided by the embodiment can improve the product performance, improve the dynamic range of the receiver, solve the near-far effect problem of the multi-carrier receiver, prevent the blocking sensitivity from being reduced due to strong signals and avoid the problems of word dropping or voice-free conversation of a remote mobile phone and the like under the application scenes of the integrated machine, such as vehicle-mounted, portable and the like.
Referring to fig. 10, fig. 10 is a flowchart of an embodiment of a multi-carrier receiving method provided by the present application, where the method is applied to a multi-carrier receiver in the above embodiment, the multi-carrier receiver includes a signal processing circuit and a plurality of receiving circuits respectively connected to the signal processing circuit, each receiving circuit includes a processing circuit and a filtering switching circuit that are connected to each other, the filtering switching circuit includes a selection circuit and a plurality of filters, and filtering bandwidths of the plurality of filters are different, and the method includes:
Step 101, down-converting the multi-carrier signal by using a processing circuit to obtain an intermediate frequency signal.
Step 102, filtering the intermediate frequency signal by using a selection circuit to select one of a plurality of filters.
Preferably, in the initial state, the first to fourth receiving circuits are connected with the processing circuit and the signal processing circuit through the selection circuit, that is, the filter with wider bandwidth is selected for filtering, and the integrity of the received carrier signal can be ensured by receiving the multi-carrier signal through the four receiving circuits and selecting the filter with wider bandwidth.
And 103, detecting a carrier signal with the strongest signal strength in the multi-filtering signals by using a signal processing circuit, and marking the carrier signal as a strong carrier signal.
And 104, when the strong carrier signal exists in the multi-carrier signal, controlling a selection circuit in at least two receiving circuits to select one filter to be connected with a processing circuit, so that the strong carrier signal and other carrier signals in the multi-carrier signal are respectively filtered through different filters.
The strong carrier signal is a carrier signal with a signal strength greater than a preset signal strength, and the structure and the working principle of the multi-carrier receiver are the same as those of the multi-carrier receiver embodiment described above, and are not described herein again.
The embodiment provides a method for improving dynamic range of a broadband receiver, which designs a plurality of filtering channels with different filtering bandwidths on an intermediate frequency receiving path of the multi-carrier receiver, selects a proper filtering channel to process a carrier signal according to the frequency difference between the highest frequency of the carrier signal and the lowest frequency of the carrier signal, plays a role in inhibiting signals outside the passband of the filter, further improves dynamic range and in-band blocking index of the receiver, and can be applied to transceivers in a communication system or the multi-carrier receiver.
The foregoing description is only illustrative of the present application and is not intended to limit the scope of the application, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present application.
Claims (9)
1. A multi-carrier receiver, comprising:
The device comprises a plurality of receiving circuits, a filtering switching circuit and a processing circuit, wherein each receiving circuit comprises a processing circuit and a filtering switching circuit which are connected with each other, the processing circuit is used for carrying out down-conversion on a multi-carrier signal to obtain an intermediate frequency signal, the filtering switching circuit comprises a selection circuit and a plurality of filters, the filtering bandwidths of the filters are different, and the selection circuit is used for selecting one filter from the filters to filter the intermediate frequency signal;
And a signal processing circuit connected to each of the receiving circuits, for detecting whether a strong carrier signal exists in the multi-carrier signal, and controlling a selection circuit of at least two receiving circuits to select one of the filters to be connected to a processing circuit when the strong carrier signal exists in the multi-carrier signal, so that the strong carrier signal and other carrier signals in the multi-carrier signal are filtered by different filters, respectively, wherein the strong carrier signal is a carrier signal having a signal strength greater than a preset signal strength, all the carrier signals have a carrier signal having a frequency greater than a frequency of the strong carrier signal as a first carrier signal, a carrier signal having a frequency less than a frequency of the strong carrier signal as a second carrier signal, the signal processing circuit being adapted to determine whether the frequency of the strong carrier signal is a minimum or maximum value of the frequency of the carrier signal in the multi-carrier signal, and to control a selection circuit of the receiving circuits to obtain a bandwidth from the plurality of filters, and to connect to a corresponding one of the filter circuits to the filter circuits, and to the other filter circuit to obtain a bandwidth from the multi-carrier signal, wherein the other filter circuit is adapted to obtain a bandwidth from the filter circuit and the filter circuit is adapted to obtain a bandwidth from the other filter circuit, to obtain a filtered signal corresponding to the second carrier signal.
2. The multi-carrier receiver of claim 1, wherein the selection circuit comprises:
the first selection circuit is connected with the processing circuit and the signal processing circuit and is used for selecting a filter corresponding to the first control signal to be connected with the processing circuit after receiving the first control signal output by the signal processing circuit so as to transmit the intermediate frequency signal to the filter;
And the second selection circuit is connected with the signal processing circuit and is used for selecting a filter corresponding to the first control signal to be connected with the signal processing circuit after receiving the second control signal output by the signal processing circuit so as to transmit the filtered signal filtered by the filter to the signal processing circuit.
3. The multi-carrier receiver of claim 2, wherein,
The first selection circuit is a first single-pole multi-throw switch, the first single-pole multi-throw switch comprises a first input end and a plurality of first output ends, the first input end is connected with the processing circuit, the plurality of first output ends are respectively connected with the filter, the second selection circuit is a second single-pole multi-throw switch, the second single-pole multi-throw switch comprises a plurality of second input ends and second output ends, the plurality of second input ends are respectively connected with the filter, and the second output ends are connected with the signal processing circuit.
4. The multi-carrier receiver of claim 1, wherein,
The signal processing circuit is further configured to, when the frequency of the strong carrier signal is the minimum value or the maximum value of the frequencies of carrier signals in the multi-carrier signal, control a selection circuit in one of the receiving circuits to select a filter with a widest bandwidth from the plurality of filters to be connected with the processing circuit, obtain a filtered signal corresponding to the strong carrier signal, and control a selection circuit in another of the receiving circuits to select a filter with a bandwidth matching with other carrier signals in the multi-carrier signal from the plurality of filters to be connected with the processing circuit, obtain a filtered signal corresponding to other carrier signals in the multi-carrier signal.
5. The multi-carrier receiver of claim 1, wherein,
The signal processing circuit is further used for controlling a selection circuit in one of the receiving circuits to select a filter with the widest bandwidth from the plurality of filters to be connected with the processing circuit when no strong carrier signal exists in the multi-carrier signal, and obtaining a filtering signal corresponding to the multi-carrier signal.
6. The multi-carrier receiver of any one of claims 1-5, wherein,
The bandwidth of the filter with the widest bandwidth among the plurality of filters is greater than the signal bandwidth of the multi-carrier signal.
7. The multi-carrier receiver of claim 1, wherein,
The receiving circuit further comprises an analog-to-digital converter, the signal processing circuit is a digital processing chip, the digital processing chip is connected with the analog-to-digital converter and the selection circuit, and the analog-to-digital converter is used for performing analog-to-digital conversion processing on the filtered signals to obtain digital signals.
8. The multi-carrier receiver of claim 1, wherein,
The multi-carrier receiver further comprises an antenna, wherein the antenna is respectively connected with the plurality of receiving circuits and is used for transmitting the received multi-carrier signals to the plurality of receiving circuits.
9. A multi-carrier receiving method, characterized by being applied to a multi-carrier receiver including a signal processing circuit and a plurality of receiving circuits respectively connected to the signal processing circuits, each of the receiving circuits including a processing circuit and a filter switching circuit connected to each other, the filter switching circuit including a selection circuit and a plurality of filters each having a different filter bandwidth, the method comprising:
performing down-conversion on the multi-carrier signal by using the processing circuit to obtain an intermediate frequency signal;
filtering the intermediate frequency signal by using the selection circuit to select one of the plurality of filters;
Detecting whether a strong carrier signal exists in the multi-carrier signal by using the signal processing circuit, and controlling a selection circuit in at least two receiving circuits to select one filter to be connected with the processing circuit when the strong carrier signal exists in the multi-carrier signal, so that the strong carrier signal and other carrier signals in the multi-carrier signal are respectively filtered by different filters, wherein the strong carrier signal is a carrier signal with signal strength larger than preset signal strength;
the method comprises the steps of judging whether the frequency of a strong carrier signal is the minimum value or the maximum value of the frequency of a carrier signal in a multi-carrier signal or not, controlling a selection circuit in one receiving circuit to select a filter matched with the bandwidth of a first carrier signal from a plurality of filters to be connected with a processing circuit so as to obtain a filtered signal corresponding to the first carrier signal, and controlling a selection circuit in the other receiving circuit to select a filter matched with the bandwidth of a second carrier signal from the plurality of filters to be connected with the processing circuit so as to obtain a filtered signal corresponding to the second carrier signal, and controlling a selection circuit in the other receiving circuit to select a filter with the widest bandwidth from the plurality of filters to be connected with the processing circuit so as to obtain a filtered signal corresponding to the strong carrier signal, and controlling a selection circuit in the other receiving circuit to select a filter matched with the bandwidth of a second carrier signal from the plurality of filters to be connected with the processing circuit so as to obtain a filtered signal corresponding to the carrier signal with the bandwidth of the carrier signal, wherein the filter matched with the bandwidth of the carrier signal is the carrier signal with the first carrier signal, and the carrier signal is the carrier signal with the high frequency.
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| US6718166B2 (en) * | 2002-05-17 | 2004-04-06 | Illinois Superconductor Corporation, Inc. | Multiple carrier adaptive notch filter |
| KR20040083861A (en) * | 2003-03-25 | 2004-10-06 | 유티스타콤코리아 유한회사 | Apparatus for handling digital IF signal as possible jamming signal detection |
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