CN116208181A - Multi-carrier receiving method and multi-carrier receiver - Google Patents
Multi-carrier receiving method and multi-carrier receiver Download PDFInfo
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- CN116208181A CN116208181A CN202111445564.2A CN202111445564A CN116208181A CN 116208181 A CN116208181 A CN 116208181A CN 202111445564 A CN202111445564 A CN 202111445564A CN 116208181 A CN116208181 A CN 116208181A
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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
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, and the processing circuit performs down-conversion on multi-carrier signals to obtain intermediate frequency signals; the filtering switching circuit comprises a selection circuit and a plurality of filters, wherein the filtering bandwidths of the filters are different, and the selection circuit selects one filter to filter the intermediate frequency signal; the signal processing circuit detects whether a strong carrier signal exists in the multi-carrier signal, and when the strong carrier signal exists in the multi-carrier signal, the signal processing circuit controls the selection circuit in at least two receiving circuits to select one filter to be connected with the processing circuit, so that the strong carrier signal and other carrier signals in the multi-carrier signal are filtered through different filters respectively, and the strong carrier signal is a carrier signal with signal strength larger than preset signal strength. By the method, 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
Wideband multicarrier receivers have great advantages in terms of circuit miniaturization, cost control, intermediate frequency planning, etc., but are limited by the specification limitations of signal-to-noise ratio (Signal to Noise Ratio, SNR) of analog-to-digital converters (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 superheterodyne receivers, 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.
In order to solve the technical problems, the technical scheme adopted by the application is as follows: there is provided a multicarrier receiver comprising: the signal processing circuit and the receiving circuits are connected with each other, and each receiving circuit comprises a processing circuit and a filtering switching circuit which are connected with each other, and the processing circuit is used for carrying out down-conversion on the multi-carrier signal to obtain an intermediate frequency signal; the filtering switching circuit comprises a selection circuit and a plurality of filters, wherein the filter 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 to obtain a filtered signal; the signal processing circuits are respectively connected with each receiving circuit and are used for detecting whether a strong carrier signal exists in the multi-carrier signals, and when the strong carrier signal exists in the multi-carrier signals, the selection circuits in the at least two receiving circuits are controlled to select one filter to be connected with the processing circuits, so that the strong carrier signal and other carrier signals in the multi-carrier signals are respectively filtered through different filters, wherein the strong carrier signal is a carrier signal with signal intensity larger than preset signal intensity.
In order to solve the technical problems, another technical scheme adopted by the application is as follows: there is provided a multi-carrier receiving method applied to a multi-carrier receiver including a signal processing circuit and a plurality of receiving circuits respectively connected to the signal processing circuit, 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 a processing circuit to obtain an intermediate frequency signal; filtering the intermediate frequency signal by using a selection circuit to select one filter from a plurality of filters to obtain a filtered signal; and detecting whether a strong carrier signal exists in the multi-carrier signal by using a 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 respectively enter different filters, wherein the strong carrier signal is a carrier signal with signal strength larger than preset signal strength.
Through above-mentioned scheme, the beneficial effect of this application is: 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, and the processing circuit performs down-conversion on the multi-carrier signal to obtain a corresponding intermediate frequency signal; the filter switching circuit comprises a selection circuit and a plurality of filters with different filter bandwidths, wherein the selection circuit selects one filter from all the filters so that the filter filters a medium-frequency signal to obtain a filter signal; when a strong carrier signal with signal intensity greater than preset signal intensity exists in the multi-carrier signal, the signal processing circuit controls the selection circuits in at least two receiving circuits, so that the selection circuits select corresponding filters to be connected with the processing circuits, and further the strong carrier signal and other carrier signals in the multi-carrier signal respectively enter different filters; because a plurality of filters with different filtering bandwidths are designed on each receiving channel, a proper filter is selected to filter the intermediate frequency signal, signals outside the passband of the filter can be suppressed, the influence of interference signals is reduced, and the dynamic range of the receiver is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that 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 provided in the present application;
FIG. 2 is a schematic diagram of an embodiment of a receiving circuit provided in the present application;
fig. 3 is a schematic structural diagram of another embodiment of a multicarrier receiver provided in the present application;
fig. 4 is a schematic diagram of a processing circuit, a filtering switching circuit and a signal processing circuit provided in the present application;
fig. 5 is a schematic diagram of the frequency and signal strength of 4 carrier signals provided in 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 the 4 carrier signals provided in 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 provided in the present application.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
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: the power of one carrier signal f1 is-120 dBm, the power of the other carrier signal f2 is-10 dBm, and the link gain is reduced under the influence of the carrier signal f2 with larger signal strength, so that the ADC cannot demodulate the carrier signal f1 with small 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, a new scheme is provided, and the new scheme is described in detail below.
Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of an embodiment of a multicarrier receiver provided in the present application, and fig. 2 is a schematic structural diagram of an embodiment of a receiving circuit provided in the present application, where the multicarrier receiver includes: a plurality of receiving circuits 10 and a signal processing circuit 20, each receiving circuit 10 including a processing circuit 11 and a filter switching circuit 12 connected to each other.
The processing circuit 11 is configured to acquire a carrier signal, and down-convert the multi-carrier signal to obtain an intermediate frequency signal; specifically, the multi-carrier signal includes a plurality of carrier signals, the frequency difference 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 among the plurality of filters 121 is greater than the signal bandwidth of the multi-carrier signal, the filters 121 may be Band Pass Filters (BPFs), each filter 121 is connected to a selection circuit 122, and different filtering bandwidths may be selected for the plurality of filters 121 according to the needs or the frequency of the carrier signal, for example: the number of carrier signals is 2, and 2 filters 121 are provided in each filter switching circuit 12, and their filter bandwidths are respectively: 500KHz, 2MHz; or the number of carrier signals is greater than 2, the frequency interval between two adjacent carrier signals is 250KHz, the frequency interval between the carrier signal with the highest frequency and the carrier signal with the lowest frequency is the product of the frequency interval between two adjacent carrier signals and the number of carrier signals, at this time, 3 filters 121 may be set in each filter switching circuit 12, denoted as F1, F2 and F3, where the bandwidth of the filter F1 is smaller than the frequency interval between two adjacent carrier signals, that is, smaller than 250KHz, the bandwidth of the filter F2 is greater than the frequency interval between two adjacent carrier signals and smaller/equal to the frequency interval between the carrier signal with the highest frequency and the carrier signal with the lowest frequency, and the bandwidth of the filter F3 is the largest and greater than the signal bandwidth of the multi-carrier signal, for example: the number of carrier signals is 4, and the filter bandwidths of the filters F1 to F3 can be set to be: of course, the bandwidths of the filters 121 are shown here by way of example only and not intended to limit the application, and the specific values of the bandwidths of the individual filters 121 may be set as desired for a particular application.
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: assume that the receiving circuit 10 includes 4 filters 121, and that the fourth filter 121 is connected to the processing circuit 11 and the signal processing circuit 20 by default. It will be appreciated that the number of filters 121 in each receiving circuit 10 or the default connected filters 121 may be different; for example, in the first receiving circuit 10, the default second filter 121 is connected to the processing circuit 11 and the signal processing circuit 20; in the second receiving circuit 10, the third filter 121 is connected to the processing circuit 11 and the signal processing circuit 20 by default. Here, the default filter 121 is a filter with a wider bandwidth, and the filter with a wider bandwidth is larger than the frequency interval between the carrier signal with the highest frequency and the carrier signal with the lowest frequency; for example, the bandwidth of the wider bandwidth filter may be 1MHz, with the number of carrier signals being 4 and the frequency spacing of the carrier signals being 250KHz as an example.
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 selecting 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, where the preset signal strength may be a signal strength threshold set according to experience or application needs, 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 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, such as: assuming that the frequency interval between the highest frequency and the lowest frequency is about 1MHz, the multicarrier signal can be filtered using the filter 121 having a filter bandwidth of 1MHz.
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 structural diagram of another embodiment of a multicarrier receiver provided in 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, the first amplifier 111 being connected to the antenna 30, which may be a low noise amplifier (Low Noise Amplifier, LNA) for amplifying the carrier signal; the DSA 112 attenuates the carrier signal output from the first amplifier 111; the fourth filter 113 filters the carrier signal output from the DSA 112; the second amplifier 114 amplifies the carrier signal output from the fourth filter 113; the fifth filter 115 filters the carrier signal output from the second amplifier 114; the local oscillator 116 is used for generating a local oscillation signal; the mixer 117 is configured to mix the local oscillation signal with the carrier signal output from the fifth filter 115, and 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, where the first single-pole multi-throw switch includes a first input end and a plurality of first output ends (not identified in the figure), the first input end is connected to the processing circuit 11, and the plurality of first output ends are respectively connected to the filters 121, that is, 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 terminals and a second output terminal (not labeled in the figure), the plurality of second input terminals are respectively connected to the filters 121, that is, the plurality of second input terminals are in one-to-one correspondence with the plurality of filters 121, and the second output terminal is 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 disposed between the filter switching circuit 12 and the ADC 13, and the third amplifier 14 may be an adjustable gain amplifier (Variable Gain Amplifier, VGA) to amplify the filtered signal; the sixth filter 15 may be a BPF to filter the filtered signal output from the VGA to remove 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), the plurality of filters 121 with different filter bandwidths includes a first filter and a second filter (not shown), and the filter bandwidth of the first filter is greater than the filter bandwidth of the second filter; the first receiving circuit is used for demodulating the strong carrier signal, and 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 arranged to demodulate at least part of the carrier signal other than the strong carrier signal, and the signal processing circuit 20 is arranged to control the processing circuit 11 in the second receiving circuit to be connected to 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 principles of the first to fourth receiving circuits are 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 with the processing circuit 11 and the signal processing circuit 20 through the selection circuit 122, that is, the filter with wider bandwidth (that is, the second filter) is selected for filtering, and the integrity of the received carrier signal can be ensured by receiving the multi-carrier signal through the four paths of receiving circuits and the second filter; 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 detail below.
(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, and the RXD2 receiving channel where the fourth receiving circuit (not identified in the diagram) 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 guaranteed 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 according to a normal receiving mode, the carrier signals are demodulated through an RX-Main receiving channel where the first receiving circuit is located, and the first filter is used for filtering, so that more carrier signals can pass through, and the sensitivity of the receiver is improved.
(2) Combination A reception mode
As shown in fig. 8, the RXD2 receiving channel in which the fourth receiving circuit is located is used for scanning and monitoring whether there is a strong carrier signal, and the second filter is used for filtering; taking the combination 1 shown in fig. 5 as an example, when strong carrier signals occur, the 4 carrier signals are demodulated by different receiving channels, the strong carrier signal f1 enters an RX Main receiving channel where the first receiving circuit is located for demodulation, a first filter is selected, the carrier signals f2-f4 are demodulated by an RXD0 receiving channel where the second receiving circuit is located, and filtering is performed by using a second filter, so as to ensure that the carrier signals f2-f4 can all pass through.
(3) Combination B reception mode
As shown in fig. 9, the RXD2 receiving channel in which the fourth receiving circuit is located is used for scanning and monitoring whether there is a strong carrier signal, and the second filter is used for filtering; taking the combination 2 shown in fig. 5 as an example, when strong carrier signals appear, the 4 carrier signals are demodulated by different receiving channels respectively, the normal carrier signal f1 enters an RX Main receiving channel where the first receiving circuit is located for demodulation, and a third filter is used for filtering to filter out other carrier signals, so that interference is reduced; the strong carrier signal f2 enters the RXD0 receiving channel where the second receiving circuit is positioned for processing, and is filtered by using a first filter; the normal carrier signals f3-f4 enter the RXD1 receiving channel where the third receiving circuit is located for demodulation, and the second filter is used for filtering 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 in 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: and performing down-conversion on the multi-carrier signal by using a processing circuit to obtain an intermediate frequency signal.
Step 102: the intermediate frequency signal is filtered by a selection circuit selecting one of the 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-way receiving circuit and selecting the filter with wider bandwidth.
Step 103: the carrier signal with the strongest signal strength in the multi-filtering signals is detected by the signal processing circuit and is recorded as a strong carrier signal.
Step 104: when a strong carrier signal exists in the multi-carrier signal, a selection circuit in at least two receiving circuits is controlled 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 exemplary embodiments of the present application and is not intended to limit the scope of the present application, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the present application.
Claims (10)
1. A multi-carrier receiver, comprising:
the receiving circuits each comprise a processing circuit and a filtering switching circuit which are connected with each other, and the processing circuit is used for carrying out down-conversion on the multi-carrier signal to obtain an intermediate frequency signal; the filtering switching circuit comprises a selection circuit and a plurality of filters, wherein the filter 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 the signal processing circuits are respectively connected with each receiving circuit and are used for detecting whether a strong carrier signal exists in the multi-carrier signals, and when the strong carrier signal exists in the multi-carrier signals, the signal processing circuits control the selection circuits in at least two receiving circuits to select one filter to be connected with the processing circuits so that the strong carrier signal and other carrier signals in the multi-carrier signals are respectively filtered through different filters, wherein the strong carrier signal is a carrier signal with the signal strength larger than the preset signal strength.
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, and 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 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 determine whether the frequency of the strong carrier signal is a minimum value or a maximum value of the frequencies of carrier signals in the multi-carrier signal, and to 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, so as to obtain a filtered signal corresponding to the strong carrier signal, and control a selection circuit in the other receiving circuit 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, so as to obtain a filtered signal corresponding to other carrier signals in the multi-carrier signal.
5. The multi-carrier receiver of claim 4, wherein,
all carrier signals with the frequency larger than the frequency of the strong carrier signal are marked as first carrier signals, and carrier signals with the frequency smaller than the frequency of the strong carrier signal are marked as second carrier signals;
the signal processing circuit is further configured to control a selection circuit in one of the receiving circuits to select a filter matched with a bandwidth of the first carrier signal from the plurality of filters to be connected to the processing circuit when the frequency of the strong carrier signal is not a minimum value or a maximum value of the frequency of the carrier signal in the multi-carrier signal, obtain a filtered signal corresponding to the first carrier signal, and control a selection circuit in the other receiving circuit to select a filter having a widest bandwidth from the plurality of filters to be connected to the processing circuit, obtain a filtered signal corresponding to the strong carrier signal, and control a selection circuit in the other receiving circuit to select a filter matched with a bandwidth of the second carrier signal from the plurality of filters to be connected to the processing circuit, so as to obtain a filtered signal corresponding to the second carrier signal.
6. 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.
7. The multi-carrier receiver according to any one of claims 1 to 6, 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.
8. 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.
9. 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.
10. 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;
and 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.
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| CN202111445564.2A CN116208181A (en) | 2021-11-30 | 2021-11-30 | Multi-carrier receiving method and multi-carrier receiver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117040486A (en) * | 2023-10-07 | 2023-11-10 | 成都玖锦科技有限公司 | Multi-gear digital filter and broadband digital receiver |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117040486A (en) * | 2023-10-07 | 2023-11-10 | 成都玖锦科技有限公司 | Multi-gear digital filter and broadband digital receiver |
| CN117040486B (en) * | 2023-10-07 | 2023-12-19 | 成都玖锦科技有限公司 | Multi-gear digital filter and broadband digital receiver |
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