WO2023097461A1 - 多载波接收方法以及多载波接收机 - Google Patents
多载波接收方法以及多载波接收机 Download PDFInfo
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- WO2023097461A1 WO2023097461A1 PCT/CN2021/134462 CN2021134462W WO2023097461A1 WO 2023097461 A1 WO2023097461 A1 WO 2023097461A1 CN 2021134462 W CN2021134462 W CN 2021134462W WO 2023097461 A1 WO2023097461 A1 WO 2023097461A1
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- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
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- the present application relates to the technical field of communications, and in particular to a multi-carrier receiving method and a multi-carrier receiver.
- Wideband multi-carrier receivers have great advantages in circuit miniaturization, cost control, and IF frequency planning, but are limited by the Signal to Noise Ratio (Signal to Noise Ratio, SNR), spurious free dynamic range (Spurious Free Dynamic Range, SFDR) and other specifications, the dynamic range of the receiver is much lower than that of the superheterodyne receiver, and it is easily affected by in-band interference signals.
- SNR Signal to Noise Ratio
- spurious free dynamic range Spurious Free Dynamic Range
- the present application provides a multi-carrier receiving method and a multi-carrier receiver, which can improve the dynamic range of the receiver.
- the technical solution adopted by this application is: provide a multi-carrier receiver, the multi-carrier receiver includes: a signal processing circuit and a plurality of receiving circuits, each receiving circuit includes a processing circuit and a filtering circuit connected to each other The switching circuit, the processing circuit is used to down-convert the multi-carrier signal to obtain the intermediate frequency signal; the filter switching circuit includes a selection circuit and a plurality of filters, and the filter bandwidths of the multiple filters are different, and the selection circuit is used to select from multiple filters Select one of the filters to filter the intermediate frequency signal to obtain the filtered signal; the signal processing circuit is connected to each receiving circuit to detect whether there is a strong carrier signal in the multi-carrier signal, and there is a strong carrier signal in the multi-carrier signal , control the selection circuit in at least two receiving circuits to select one of the filters to be connected to the processing circuit, so that the strong carrier signal and other carrier signals in the multi-carrier signal are filtered through different filters, wherein the strong carrier signal is
- each receiving circuit includes a processing circuit and a filter switching circuit connected to each other, the filter switching circuit includes a selection circuit and a plurality of filters, and the filtering bandwidths of the plurality of filters are different
- the method includes: using the processing circuit to perform multiple The carrier signal is down-converted to obtain an intermediate frequency signal; a filter is used to select one of the filters from multiple filters to filter the intermediate frequency signal to obtain a filtered signal; the signal processing circuit is used to detect whether there is a strong carrier signal in the multi-carrier signal, and When there is a strong carrier signal in the multi-carrier signal, control the selection circuit in at least two receiving circuits to select one of the filters to be connected to the processing circuit, so that the strong carrier signal and other carrier signals in the multi-carrier signal enter different filters respectively device, wherein the strong carrier signal is a carrier signal
- the multi-carrier receiver includes a signal processing circuit and a plurality of receiving circuits, each receiving circuit includes a processing circuit and a filter 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 includes a selection circuit and a plurality of filters with different filter bandwidths, and the selection circuit selects a filter from all filters, so that the filter filters the intermediate frequency signal to obtain a filtered signal; in multi-carrier signals
- the signal processing circuit controls the selection circuits in at least two receiving circuits, so that the selection circuit selects a corresponding filter to connect with the processing circuit, so that the strong carrier signal and The other carrier signals in the multi-carrier signal enter different filters respectively; since multiple filters with different filter bandwidths are designed on each receiving path, selecting an appropriate filter to filter the intermediate frequency signal can improve the pass-through of the filter.
- FIG. 1 is a schematic structural diagram of an embodiment of a multi-carrier receiver provided by the present application
- FIG. 2 is a schematic structural diagram of an embodiment of a receiving circuit provided by the present application.
- FIG. 3 is a schematic structural diagram of another embodiment of a multi-carrier receiver provided by the present application.
- Fig. 4 is the structural representation of processing circuit, filter switching circuit and signal processing circuit that the application provides;
- Fig. 5 is a schematic diagram of the frequencies and signal strengths of four carrier signals provided by the present application.
- Fig. 6 is the schematic diagram that demodulates 4 kinds of carrier signals shown in Fig. 5;
- Fig. 7 is another schematic diagram of the frequencies and signal strengths of four carrier signals provided by the present application.
- Fig. 8 is another schematic diagram of demodulating the 4 kinds of carrier signals shown in Fig. 5;
- Fig. 9 is another schematic diagram of demodulating the four carrier signals shown in Fig. 5;
- Fig. 10 is a schematic flowchart of an embodiment of a multi-carrier receiving method provided by the present application.
- the input level of the base station receiver is much higher than -23dBm, which is extremely extreme.
- the signal strength is greater than 0dBm.
- FIG. 1 is a schematic structural diagram of an embodiment of a multi-carrier receiver provided by the present application
- FIG. 2 is a schematic structural diagram of an embodiment of a receiving circuit provided by the present application.
- the multi-carrier receiver includes: Each receiving circuit 10 and a signal processing circuit 20, each receiving circuit 10 includes a processing circuit 11 and a filter switching circuit 12 connected to each other.
- the processing circuit 11 is used to obtain the 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, and the frequency difference of the plurality of carrier signals can be a fixed value, and the carrier signal is For the radio frequency signal, the processing circuit 11 can perform frequency mixing processing on the radio frequency signal to realize down-conversion.
- the filter switching circuit 12 includes a selection circuit 122 and a plurality of filters 121, the filter bandwidths of the plurality of filters 121 are all different, and the selection circuit 122 is used to select one of the filters 121 from the plurality of filters 121 to filter the intermediate frequency signal, Obtain the 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, and the filter 121 can be a bandpass filter (Bandpass filter, BPF), each filter 121 is connected to the selection circuit 122, and different filter bandwidths can be selected for multiple 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 are set in each filter switching circuit 12 Filter 121, their filter bandwidths are respectively: 500KHz, 2MHz; or the number of carrier signals is greater than 2, and the frequency interval between two adjacent carrier signals is 250KHz, then the carrier signal with the highest frequency and the carrier signal with the lowest frequency The
- each filter switching circuit 12 denoted as F1, F2 and F3, and the filter F1
- the bandwidth of the filter F2 is less than the frequency interval between two adjacent carrier signals, that is, less than 250KHz.
- the bandwidth of the filter F2 is greater than the frequency interval between two adjacent carrier signals and less than/equal to the carrier signal with the highest frequency and the carrier signal with the lowest frequency.
- 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, the filtering bandwidth of the filter F1-F3 can be set to: 100KHz, 1MHz and 5MHz, of course,
- the bandwidth of the filter 121 is only shown as an example, and is not used to limit the application.
- the specific value of the bandwidth of each filter 121 can be set according to specific application requirements.
- a certain filter 121 in the filter switching circuit 12 can be connected to the processing circuit 11 and the signal processing circuit 20 through the selection circuit 122 by default, for example: assuming that the receiving circuit 10 includes four filters 121, the default Four filters 121 are connected to the processing circuit 11 and the signal processing circuit 20 . It can be understood that the number of filters 121 in each receiving circuit 10 or the default connected filter 121 can be different; 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.
- the filter 121 connected by default is a filter with a wider bandwidth, and the filtering bandwidth of the filter with a wider bandwidth is greater than the frequency interval between the carrier signal with the highest frequency and the carrier signal with the lowest frequency;
- the number of carrier signals is 4 and the frequency interval of the carrier signals is 250 KHz.
- the bandwidth of the filter with a wider bandwidth may be 1 MHz.
- the signal processing circuit 20 is respectively connected with each receiving circuit 10, and it is used to detect whether there is a strong carrier signal in the multi-carrier signal, and when there is a strong carrier signal in the multi-filtered signal, control the selection circuit in at least two receiving circuits 10 122 selects 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 filtered through different filters 121 respectively, and the other carrier signals are except for the strong carrier signal in the multi-carrier signal
- a strong carrier signal is a carrier signal with a signal strength greater than a preset signal strength, and the preset signal strength can be a signal strength threshold set according to experience or application needs, for example: -30dBm.
- the detection of the signal strength of the multi-carrier signal is essentially the detection of the signal strength of the filtered signal output by the receiving circuit 10, that is, after the signal processing circuit 20 receives the filtered signal output by the receiving circuit 10, it The signal strength of the filter signal is detected, and the signal strength of the filtered signal is compared with the preset signal strength. If it is judged that the signal strength of the filtered signal is greater than the preset signal strength, it indicates that one of the received multiple carrier signals has a lower signal strength. Large signal, in order to reduce the impact of this 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 filter the intermediate frequency signal in the filter switching circuit 12 The device 121 switches.
- an appropriate filter 121 can be selected according to the frequency interval between the highest frequency of the carrier signal and the lowest frequency of the carrier signal, for example: assuming that the highest frequency and the lowest frequency If the frequency interval is about 1 MHz, then the filter 121 with a filter bandwidth of 1 MHz can be used to filter the multi-carrier signal.
- the filter in the IF receiving circuit is a broadband filter, which has no suppression effect on the useful or interfering signals in the band.
- the solution provided in this embodiment has different design features on the IF receiving path. Multiple filters with filtering bandwidth, according to the signal strength of the carrier signal in the multi-carrier signal and the bandwidth of the carrier signal, select the appropriate filter to filter the intermediate frequency signal, and play a certain role in the signal outside the passband of the filter.
- the suppression effect (above 30dB) reduces the influence of interference signals, and can improve the dynamic range of the receiver, better meet the application scenarios such as vehicle or portable, and improve the applicability of the product.
- FIG. 3 is a schematic structural diagram of another embodiment of a multi-carrier receiver provided by the present application.
- the multi-carrier receiver includes: a plurality of receiving circuits 10 , a signal processing circuit 20 and an antenna 30 .
- the antennas 30 are respectively connected to a plurality of receiving circuits 10 , and are used to transmit received multi-carrier signals to the plurality of receiving circuits 10 .
- Each receiving circuit 10 is connected to the antenna 30, which includes a processing circuit 11, a filter switching circuit 12 and an ADC 13.
- the processing circuit 11 is used for down-converting the multi-carrier signal to obtain an intermediate frequency signal.
- 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, Local oscillator 116 and mixer 117, first amplifier 111 is connected with antenna 30, and it can be low noise amplifier (Low Noise Amplifier, LNA), and it is used for amplifying carrier signal; DSA 112 is output to first amplifier 111
- the carrier signal of the fourth filter 113 is attenuated; the fourth filter 113 filters the carrier signal of the DSA 112 output; the second amplifier 114 amplifies the carrier signal of the fourth filter 113 output; the fifth filter 115 outputs the second amplifier 114
- the carrier signal is filtered; the local oscillator 116 is used to generate a local oscillator signal; the mixer 117 is used to mix the local oscillator signal and the carrier signal output
- the local oscillator 116 can also 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 one local oscillator 116 is used to generate a local oscillator signal, which helps to reduce the overall volume of the circuit and lower the cost.
- the filter switching circuit 12 includes a plurality of filters 121 with 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 used to select the filter 121 corresponding to the first control signal and connect the intermediate frequency signal to The signal is transmitted 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 used for selecting 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 by the signal processing circuit 20, that is, the second 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 .
- the first selection circuit 1221 is a first single-pole multi-throw switch
- the first single-pole multi-throw switch includes a first input terminal and a plurality of first output terminals (not marked in the figure), the first input terminal is connected to the processing circuit 11, and a plurality of first output terminals are respectively connected to the filter 121, that is, a plurality of first output terminals are in one-to-one correspondence with a plurality of filters 121
- the second selection circuit 1222 is a second single-pole multi-throw switch
- the second single-pole multi-throw switch includes multiple second input terminals and second output terminals (not marked in the figure), and the multiple second input terminals are respectively connected to the filter 121, that is, multiple second input terminals and multiple filter terminals 121 correspond to each other, and the second output terminal is connected to the signal processing circuit 20 .
- FIG. 4 uses an example in which the number of filters 121 is three for illustration, but it is not limited thereto, and the number of filters 121
- the ADC 13 is used to perform analog-to-digital conversion processing on the filtered signal to obtain a digital signal, which is a digital intermediate frequency signal.
- the receiving circuit 10 also includes a third amplifier 14 and a sixth filter 15 arranged between the filter switching circuit 12 and the ADC 13, the third amplifier 14 can be an adjustable gain amplifier (Variable Gain Amplifier, VGA), to amplify the filter signal; the sixth filter 15 can be a BPF, to filter the filter signal output by the VGA, and filter out the interference signal.
- VGA adjustable Gain Amplifier
- the signal processing circuit 20 is connected with the receiving circuit 10, and it is used to detect the signal strength of the carrier signal.
- the control processing circuit 11 is connected with the corresponding filter 121, so that the strong carrier signal
- the other carrier signals in the multi-carrier signal are filtered through different filters 121 respectively.
- the signal processing circuit 20 is a digital processing chip, as shown in Figure 4, the digital processing chip is connected with the ADC 13 and the selection circuit 122, and the digital processing chip is used to identify the signal strength of the digital signal.
- the signal processing circuit 20 is also used to judge whether the frequency of the strong carrier signal is the minimum or maximum value of the frequency of the carrier signal in the multi-carrier signal, obtain the judgment result and control the filter switching circuit 12 based on the judgment result.
- the signal processing circuit 20 is used to control the selection circuit 122 in one of the receiving circuits 10 to select from multiple Select the filter 121 with the widest bandwidth in the device 121 to be connected to the processing circuit 11 to obtain a filter signal corresponding to a strong carrier signal, and control the selection circuit 122 in another receiving circuit 10 to select from multiple filters 121 and multi-carrier A filter 121 matching the bandwidth of other carrier signals in the signal is connected to the processing circuit 11 to obtain filtered signals corresponding to other carrier signals in the multi-carrier signal.
- multiple receiving circuits 10 include a first receiving circuit and a second receiving circuit (not shown in the figure), and multiple filters 121 with different filtering bandwidths include a first filter and a second filter (not shown in the figure), the filtering bandwidth of the first filter is greater than the filtering bandwidth of the second filter; the first receiving circuit is used to demodulate the strong carrier signal, and the signal processing circuit 20 is used to control the first receiving circuit
- the processing circuit 11 is connected with the first filter in the first receiving circuit; the second receiving circuit is used to demodulate at least part of the carrier signal except the strong carrier signal, and the signal processing circuit 20 is used to control the second receiving circuit
- the processing circuit 11 in is connected to the second filter in the second receiving circuit.
- multiple receiving circuits 10 also include a third receiving circuit (not shown in the figure), and multiple filters 121 with different filtering bandwidths also include a third filter (not shown in the figure) , the filtering bandwidth of the second filter is greater than the filtering bandwidth of the third filter, the carrier signal with a frequency greater than that of the strong carrier signal in the multi-carrier signal is recorded as the first carrier signal, and the frequency in the multi-carrier signal is smaller than that of the strong carrier signal The carrier signal of the frequency is denoted as the second carrier signal.
- the signal processing circuit 20 is also used to control the selection circuit 122 in one of the receiving circuits 10 (i.e.
- the filter 121 selected to match the bandwidth of the first carrier signal is connected to the processing circuit 11 to obtain a filter signal corresponding to the first carrier signal, and to control another receiving circuit 10 ( That is, the selection circuit 122 in the second receiving circuit) selects the first filter to be connected to the processing circuit 11, obtains a filter signal corresponding to a strong carrier signal, and is used to control the filter signal in another receiving circuit 10 (that is, the third receiving circuit)
- the selection circuit 122 selects the filter 121 matching the bandwidth of the second carrier signal from the first filter and the second filter and connects it to the processing circuit 11 to obtain a filtered signal corresponding to the second carrier signal.
- the signal processing circuit 20 is also used to control the selection circuit 122 in one of the receiving circuits 10 to select the filter with the widest bandwidth from multiple filters when there is no strong carrier signal in the multi-carrier signal.
- the device is connected with the processing circuit 11 to obtain the filtered signal corresponding to the multi-carrier signal.
- the number of receiving circuits 10 is determined by the number of carrier signals and the number of demodulated signals that need to be obtained. For example, if the number of carrier signals is greater than 3, then the number of receiving circuits 10 is at least 3 and less than or equal to The quantity of carrier signal, if only in order to separate strong signal from other carrier signals, then the quantity of demodulation signal is at most 3, can only set 3 receiving circuits 10 at this moment, if for strong signal and other carrier signal If the carrier signals of different frequency bands or each carrier signal of other carrier signals are demodulated separately, more receiving circuits 10 need to be provided to obtain a corresponding number of demodulated signals.
- the multiple receiving circuits 10 also include a fourth receiving circuit (not shown in the figure), the fourth receiving circuit is connected to the signal processing circuit 20, and it is used to scan and monitor whether there is a strong carrier signal, and Feedback to the processing circuit 20, the working principles of the first to fourth receiving circuits will be described in detail below.
- a multi-carrier signal includes 4 carrier signals, and the frequency interval between two adjacent carrier signals is 250KHz.
- the filtering bandwidth of the first filter is 5MHz
- the filtering bandwidth of the second filter is 1MHz
- the filtering bandwidth of the third filter is 150KHz.
- combination 1 and combination 4 can be classified into the same category (combination A), and combination 2 and combination 3 can be classified into the same category (combination B).
- the first to fourth receiving circuits all select the second filter to be connected to the processing circuit 11 and the signal processing circuit 20 through the selection circuit 122, that is, select a filter with a wider bandwidth (ie, the second filter) for filtering , receiving the multi-carrier signal and the second filter can guarantee the integrity of the received carrier signal by four receiving circuits; then, the signal processing circuit 20 detects the signal strength of the carrier signal and determines whether the The filters in the first to third receiving circuits are switched, and the specific processing process is as follows.
- Figure 6 is a simplification of Figure 3, omitting other circuit elements in Figure 3 except the filter and signal processing circuit, the RXD2 receiving channel where the fourth receiving circuit (not marked in the figure) is used for Scan to monitor whether there is a strong carrier signal, and use the second filter for filtering, that is, use a filter with a wider bandwidth, so that all carrier signals can pass through; when there is no strong carrier signal, for example, as shown in Figure 7 It shows that the signal strengths corresponding to the carrier signals f1-f4 are all lower than the preset signal strength; the four carrier signals are demodulated according to the normal receiving mode, and the carrier signals are demodulated through the RX-Main receiving channel where the first receiving circuit is located, and use The first filter performs filtering to ensure that more carrier signals pass through, thereby improving the sensitivity of the receiver.
- the RXD2 receiving channel where the fourth receiving circuit is located is used to scan and monitor whether there is a strong carrier signal, and use the second filter for filtering; taking the combination 1 shown in Figure 5 as an example, when a strong carrier signal appears , the four carrier signals are respectively demodulated by different receiving channels, the strong carrier signal f1 enters the RX Main receiving channel where the first receiving circuit is located for demodulation, the first filter is selected, and the carrier signals f2-f4 pass through the second receiving circuit where The RXD0 receiving channel is demodulated, and the second filter is used for filtering to ensure that the carrier signals f2-f4 can all pass through.
- the RXD2 receiving channel where the fourth receiving circuit is located is used to scan and monitor whether there is a strong carrier signal, and use the second filter for filtering; taking the combination 2 shown in Figure 5 as an example, when a strong carrier signal appears , the four carrier signals are respectively 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 is filtered by the third filter to filter out other carrier signals, Reduce interference; the strong carrier signal f2 enters the RXD0 receiving channel where the second receiving circuit is located for processing, and uses the first filter for filtering; the normal carrier signal f3-f4 enters the RXD1 receiving channel where the third receiving circuit is demodulated, and uses The second filter performs filtering to ensure that the carrier signals f3-f4 can all pass through.
- the technical solution provided by this embodiment can improve product performance, increase the dynamic range of the receiver, and solve the problem of near-far effect in multi-carrier receivers, so that in the application scenarios of integrated vehicle, portable, etc., there will be no blocking caused by strong signals
- the sensitivity is reduced to avoid problems such as dropped words or no voice in the remote handset.
- FIG. 10 is a schematic flowchart of an embodiment of a multi-carrier receiving method provided by the present application. The method is applied to the multi-carrier receiver in the above-mentioned embodiment.
- Step 101 Using a processing circuit to down-convert the multi-carrier signal to obtain an intermediate frequency signal.
- Step 102 Using a selection circuit to select one filter from a plurality of filters to filter the intermediate frequency signal.
- the first to fourth receiving circuits all select the second filter to be connected to the processing circuit and the signal processing circuit through the selection circuit, that is, select a filter with a wider bandwidth for filtering, and pass through the four receiving circuits Receiving multi-carrier signals and selecting a filter with a wider bandwidth can ensure the integrity of the received carrier signal.
- Step 103 Use the signal processing circuit to detect the carrier signal with the strongest signal strength among the multi-filtered signals, and record it as a strong carrier signal.
- Step 104 When there is a strong carrier signal in the multi-carrier signal, control the selection circuits in at least two receiving circuits to select one of the filters to be connected to the processing circuit, so that the strong carrier signal and other carrier signals in the multi-carrier signal pass through respectively Different filters are used for filtering.
- a strong carrier signal is a carrier signal whose signal strength is greater than a preset signal strength.
- the structure and working principle of the multi-carrier receiver are the same as those of the above-mentioned embodiment of the multi-carrier receiver, and will not be repeated here.
- This embodiment provides a method for improving the dynamic range of a wideband receiver.
- a plurality of filter channels with different filter bandwidths are designed. According to the difference between the highest frequency of the carrier signal and the lowest frequency of the carrier signal, The frequency difference between them, select the appropriate filter channel to process the carrier signal, and suppress the signal outside the passband of the filter, thereby improving the dynamic range of the receiver and the in-band blocking index, which can be applied to the transceiver in the communication system transmitter or multicarrier receiver.
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Abstract
本申请公开了一种多载波接收方法以及多载波接收机，该多载波接收机包括信号处理电路与多个接收电路，接收电路包括处理电路和滤波切换电路，处理电路对多载波信号进行下变频得到中频信号；滤波切换电路包括选择电路和多个滤波器，多个滤波器的滤波带宽均不同，选择电路选择一个滤波器对中频信号进行滤波；信号处理电路检测多载波信号中是否存在强载波信号，并在多载波信号中存在强载波信号时，控制至少两个接收电路中的选择电路选择其中一个滤波器与处理电路连接，以使得强载波信号与多载波信号中的其他载波信号分别通过不同的滤波器进行滤波，强载波信号为信号强度大于预设信号强度的载波信号。通过上述方式，本申请能够改善接收机的动态范围。
Description
本申请涉及通信技术领域，具体涉及一种多载波接收方法以及多载波接收机。
宽带多载波接收机在电路小型化、成本控制以及中频频率规划等方面具有很大的优势，但受限于模数转换器(Analog to Digital Converter，ADC)的信噪比(Signal to Noise Ratio，SNR)、无杂散动态范围(Spurious Free Dynamic Range，SFDR)等规格限制，接收机的动态范围相比于超外差接收机低得多，且容易受到带内干扰信号的影响。
【发明内容】
本申请提供一种多载波接收方法以及多载波接收机，能够改善接收机的动态范围。
为解决上述技术问题，本申请采用的技术方案是：提供一种多载波接收机，该多载波接收机包括：信号处理电路与多个接收电路，每一个接收电路包括互相连接的处理电路和滤波切换电路，处理电路用于对多载波信号进行下变频，得到中频信号；滤波切换电路包括选择电路和多个滤波器，多个滤波器的滤波带宽均不同，选择电路用于从多个滤波器中选择其中一个滤波器对中频信号进行滤波，得到滤波信号；信号处理电路分别与每一个接收电路连接，用于检测多载波信号中是否存在强载波信号，并在多载波信号中存在强载波信号时，控制至少两个接收电路中的选择电路选择其中一个滤波器与处理电路连接，以使得强载波信号与多载波信号中的其他载波信号分别通过不同的滤波器进行滤波，其中，强载波信号为信号强度大于预设信号强度的载波信号。
为解决上述技术问题，本申请采用的另一技术方案是：提供一种多载波接收方法，该方法应用于多载波接收机，多载波接收机包括信号处理电路以及分别与信号处理电路连接的多个接收电路，每一个接收电路包括互 相连接的处理电路和滤波切换电路，滤波切换电路包括选择电路和多个滤波器，多个滤波器的滤波带宽均不同，该方法包括：利用处理电路对多载波信号进行下变频，得到中频信号；利用选择电路从多个滤波器中选择其中一个滤波器对中频信号进行滤波，得到滤波信号；利用信号处理电路检测多载波信号中是否存在强载波信号，并在多载波信号中存在强载波信号时，控制至少两个接收电路中的选择电路选择其中一个滤波器与处理电路连接，以使得强载波信号与多载波信号中的其他载波信号分别进入不同的滤波器，其中，强载波信号为信号强度大于预设信号强度的载波信号。
通过上述方案，本申请的有益效果是：该多载波接收机包括信号处理电路与多个接收电路，每一个接收电路包括处理电路与滤波切换电路，处理电路对多载波信号进行下变频得到相应的中频信号；滤波切换电路包括选择电路与多个滤波带宽不同的滤波器，选择电路从所有滤波器中选择出一个滤波器，以使得该滤波器对中频信号进行滤波得到滤波信号；在多载波信号中存在信号强度大于预设信号强度的强载波信号时，信号处理电路对至少两个接收电路中的选择电路进行控制，使得选择电路选择相应的滤波器与处理电路连接，进而使得强载波信号与多载波信号中的其他载波信号分别进入不同的滤波器；由于在每条接收通路上设计具有不同滤波带宽的多个滤波器，选择合适的滤波器对中频信号进行滤波，能够对滤波器的通带之外的信号进行抑制，降低干扰信号的影响，改善接收机的动态范围。
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。其中：
图1是本申请提供的多载波接收机一实施例的结构示意图；
图2是本申请提供的接收电路一实施例的结构示意图；
图3是本申请提供的多载波接收机另一实施例的结构示意图；
图4是本申请提供的处理电路、滤波切换电路以及信号处理电路的结 构示意图；
图5是本申请提供的4种载波信号的频率与信号强度的示意图；
图6是对图5所示的4种载波信号进行解调的示意图；
图7是本申请提供的4种载波信号的频率与信号强度的另一示意图；
图8是对图5所示的4种载波信号进行解调的另一示意图；
图9是对图5所示的4种载波信号进行解调的又一示意图；
图10是本申请提供的多载波接收方法一实施例的流程示意图。
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性的劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
以350MHz的一体机为例，其带内阻塞指标虽然能满足84dB的行业要求，但由于对讲机的发射功率较大，当近距离通话时，基站接收机的输入电平远高于-23dBm，极端情况下信号强度大于0dBm。当接收到强信号时，例如：一个载波信号f1的功率为-120dBm，另一个载波信号f2的功率为-10dBm，受信号强度较大的载波信号f2的影响，链路增益降低，导致ADC无法解调出-120dBm的小功率的载波信号f1。
为了在有强信号的情况下解调出小功率信号、提升多载波接收机的动态范围，本申请提供了一种新的方案，下面对该新的方案进行详细描述。
请参阅图1与图2，图1是本申请提供的多载波接收机一实施例的结构示意图，图2是本申请提供的接收电路一实施例的结构示意图，该多载波接收机包括：多个接收电路10与信号处理电路20，每一个接收电路10包括互相连接的处理电路11和滤波切换电路12。
处理电路11用于获取载波信号，并对多载波信号进行下变频，得到中频信号；具体地，多载波信号包括多个载波信号，多个载波信号的频率差值可以为固定值，载波信号为射频信号，处理电路11可对射频信号进行混 频处理，以实现下变频。
滤波切换电路12包括选择电路122与多个滤波器121，多个滤波器121的滤波带宽均不同，选择电路122用于从多个滤波器121中选择其中一个滤波器121对中频信号进行滤波，得到滤波信号；具体地，多个滤波器121中带宽最宽的滤波器121的带宽大于多载波信号的信号带宽，滤波器121可以为带通滤波器(Bandpass filter，BPF)，每一个滤波器121与选择电路122连接，可以根据需要或载波信号的频率，来为多个滤波器121选择不同的滤波带宽，比如：载波信号的数量为2个，在每一个滤波切换电路12中设置2个滤波器121，它们的滤波带宽分别为：500KHz、2MHz；或者载波信号的数量大于2个，相邻两个载波信号的频率间隔为250KHz，则频率最高的载波信号与频率最低的载波信号之间的频率间隔为相邻两个载波信号的频率间隔与载波信号的数量的乘积，此时可以在每一个滤波切换电路12中设置3个滤波器121，记作F1、F2以及F3，滤波器F1的带宽小于相邻两个载波信号的频率间隔，即小于250KHz，滤波器F2的带宽大于相邻两个载波信号的频率间隔且小于/等于频率最高的载波信号与频率最低的载波信号之间的频率间隔，滤波器F3的带宽最大且大于多载波信号的信号带宽，比如：载波信号的数量为4个，可将滤波器F1-F3的滤波带宽分别设置为：100KHz、1MHz以及5MHz，当然，这里对滤波器121的带宽仅仅是作为示例示出，并不用于对本申请进行限定，各个滤波器121的带宽的具体数值可根据具体应用需要进行设置。
进一步地，在初始状态，可以默认滤波切换电路12中的某个滤波器121通过选择电路122与处理电路11以及信号处理电路20连接，比如：假设接收电路10包括4个滤波器121，默认第四个滤波器121与处理电路11以及信号处理电路20连接。可以理解地，各个接收电路10中滤波器121的数量或默认连接的滤波器121可以不同；例如，在第一个接收电路10中，默认第二个滤波器121与处理电路11以及信号处理电路20连接；在第二个接收电路10中，默认第三个滤波器121与处理电路11以及信号处理电路20连接。这里，需要说明的是，默认连接的滤波器121为带宽较宽的滤波器，该带宽较宽的滤波器的滤波带宽大于频率最高的载波信号与频率最 低的载波信号的频率间隔；例如，以载波信号的数量为4个、载波信号的频率间隔为250KHz为例，带宽较宽的滤波器的带宽可以为1MHz。
信号处理电路20分别与每一个接收电路10连接，其用于检测多载波信号中是否存在强载波信号，并在多滤波信号中存在强载波信号时，控制至少两个接收电路10中的选择电路122选择其中一个滤波器121与处理电路11连接，以使得强载波信号与多载波信号中的其他载波信号分别通过不同的滤波器121进行滤波，其他载波信号为多载波信号中除强载波信号以外的载波信号，强载波信号为信号强度大于预设信号强度的载波信号，该预设信号强度可以为根据经验或应用需要设置的信号强度阈值，比如：-30dBm。具体地，对多载波信号的信号强度的检测实质上为对接收电路10输出的滤波信号的信号强度进行检测，即信号处理电路20在接收到接收电路10输出的滤波信号后，对该滤波信号的信号强度进行检测，并将滤波信号的信号强度与预设信号强度进行比较，如果判断出滤波信号的信号强度大于预设信号强度，则表明接收到的多个载波信号中存在一个信号强度较大的信号，为了降低这个强信号对其他载波信号的影响，信号处理电路20生成一控制信号，将该控制信号发送至滤波切换电路12，以对滤波切换电路12中对中频信号进行滤波的滤波器121进行切换。
进一步地，在检测多载波信号中是否存在强载波信号时，可以根据载波信号的最高频率和载波信号的最低频率之间的频率间隔，选择合适的滤波器121，比如：假设最高频率和最低频率的频率间隔为1MHz左右，则可使用滤波带宽为1MHz的滤波器121对多载波信号进行滤波处理。
在现有的中频接收电路设计中，中频接收电路中的滤波器为宽带滤波器，对带内有用或干扰信号无抑制作用，而本实施例所提供的方案在中频接收通路上，设计具有不同滤波带宽的多个滤波器，根据多载波信号中的载波信号的信号强度以及载波信号的带宽，选择合适的滤波器对中频信号进行滤波，对在滤波器的通带之外的信号起到一定的抑制作用(30dB以上)，降低了干扰信号的影响，且能够改善接收机的动态范围，更好地满足车载或便携等应用场景，提高产品的适用性。
请参阅图3，图3是本申请提供的多载波接收机另一实施例的结构示 意图，该多载波接收机包括：多个接收电路10、信号处理电路20以及天线30。
天线30分别与多个接收电路10连接，其用于将接收到的多载波信号传输至多个接收电路10。
每一个接收电路10与天线30连接，其包括处理电路11、滤波切换电路12以及ADC 13。
处理电路11用于对多载波信号进行下变频，得到中频信号。具体地，如图4所示，处理电路11包括：第一放大器111、数字步进衰减器(Digital Step Attenuator，DSA)112、第四滤波器113、第二放大器114、第五滤波器115、本地振荡器116以及混频器117，第一放大器111与天线30连接，其可以为低噪声放大器(Low Noise Amplifier，LNA)，其用于对载波信号进行放大；DSA 112对第一放大器111输出的载波信号进行衰减；第四滤波器113对DSA 112输出的载波信号进行滤波；第二放大器114对第四滤波器113输出的载波信号进行放大；第五滤波器115对第二放大器114输出的载波信号进行滤波；本地振荡器116用于产生本地振荡信号；混频器117用于对本地振荡信号与第五滤波器115输出的载波信号进行混频处理，得到中频信号。
在其他实施例中，本地振荡器116还可被多个接收电路10共用，即本地振荡器116与每一个处理电路11中的混频器117连接，实现使用一个本地振荡器116来产生本地振荡信号，有助于减少电路的整体体积，降低成本。
滤波切换电路12包括多个滤波带宽不同的滤波器121以及选择电路122，选择电路122包括第一选择电路1221以及第二选择电路1222。
第一选择电路1221与处理电路11以及信号处理电路20连接，其用于在接收到信号处理电路20输出的第一控制信号后，选择与第一控制信号对应的滤波器121连接并将中频信号传输至该滤波器121，以使得该滤波器121对中频信号进行滤波得到滤波信号。
第二选择电路1222与信号处理电路20连接，其用于在接收到信号处理电路20输出的第二控制信号后，选择与第一控制信号对应的滤波器121 与信号处理电路20连接，即第一选择电路1221所选择的滤波器121与第二选择电路1222所选择的滤波器121相同，以将滤波器121滤波后的滤波信号传输至信号处理电路20。
进一步地，如图4所示，第一选择电路1221为第一单刀多掷开关，第一单刀多掷开关包括第一输入端与多个第一输出端(图中未标识)，第一输入端与处理电路11连接，多个第一输出端分别与滤波器121连接，即多个第一输出端与多个滤波器121一一对应；第二选择电路1222为第二单刀多掷开关，第二单刀多掷开关包括多个第二输入端与第二输出端(图中未标识)，多个第二输入端分别与滤波器121连接，即多个第二输入端与多个滤波器121一一对应，第二输出端与信号处理电路20连接。可以理解地，图4以滤波器121的数量为3为例进行说明，但并不仅限与此，可以根据具体需要设置滤波器121的个数。
ADC 13用于对滤波信号进行模数转换处理，得到数字信号，该数字信号为数字中频信号。
在其他实施例中，如图4所示，接收电路10还包括设置在滤波切换电路12与ADC 13之间的第三放大器14和第六滤波器15，第三放大器14可以为可调增益放大器(Variable Gain Amplifier，VGA)，以对滤波信号进行放大；第六滤波器15可以为BPF，以对VGA输出的滤波信号进行滤波，滤除干扰信号。
信号处理电路20与接收电路10连接，其用于检测载波信号的信号强度，在载波信号的信号强度大于预设信号强度时，控制处理电路11与相应的滤波器121连接，以使得强载波信号与多载波信号中的其他载波信号分别通过不同的滤波器121进行滤波。具体地，信号处理电路20为数字处理芯片，如图4所示，数字处理芯片与ADC 13以及选择电路122连接，数字处理芯片用于识别数字信号的信号强度。
信号处理电路20还用于判断强载波信号的频率是否为多载波信号中载波信号的频率的最小值或最大值，得到判断结果并基于判断结果对滤波切换电路12进行控制。
进一步地，信号处理电路20用于在判断结果为强载波信号的频率为多 载波信号中载波信号的频率的最小值或最大值时，控制其中一个接收电路10中的选择电路122从多个滤波器121中选择带宽最宽的滤波器121与处理电路11连接，获得强载波信号对应的滤波信号，以及控制其中另一个接收电路10中的选择电路122从多个滤波器121中选择与多载波信号中其他载波信号的带宽匹配的滤波器121与处理电路11连接，获得多载波信号中其他载波信号对应的滤波信号。
在一具体的实施例中，多个接收电路10包括第一接收电路与第二接收电路(图中未示出)，多个滤波带宽不同的滤波器121包括第一滤波器与第二滤波器(图中未示出)，第一滤波器的滤波带宽大于第二滤波器的滤波带宽；第一接收电路用于对强载波信号进行解调，信号处理电路20用于控制第一接收电路中的处理电路11与第一接收电路中的第一滤波器连接；第二接收电路用于对除强载波信号之外的至少部分载波信号进行解调，信号处理电路20用于控制第二接收电路中的处理电路11与第二接收电路中的第二滤波器连接。在另一具体的实施例中，多个接收电路10还包括第三接收电路(图中未示出)，多个滤波带宽不同的滤波器121还包括第三滤波器(图中未示出)，第二滤波器的滤波带宽大于第三滤波器的滤波带宽，将多载波信号中频率大于强载波信号的频率的载波信号记作第一载波信号，将多载波信号中频率小于强载波信号的频率的载波信号记作第二载波信号。信号处理电路20还用于在强载波信号的频率不为多载波信号中载波信号的频率的最小值或最大值时，控制其中一个接收电路10(即第一接收电路)中的选择电路122从第二滤波器和第三滤波器中选择与第一载波信号的带宽匹配的滤波器121与处理电路11连接，获得第一载波信号对应的滤波信号，以及用于控制其中另一个接收电路10(即第二接收电路)中的选择电路122选择第一滤波器与处理电路11连接，获得强载波信号对应的滤波信号，以及用于控制其中又一个接收电路10(即第三接收电路)中的选择电路122从第一滤波器和第二滤波器中选择与第二载波信号的带宽匹配的滤波器121与处理电路11连接，以获得第二载波信号对应的滤波信号。
在其他具体的实施例中，信号处理电路20还用于在多载波信号中不存在强载波信号时，控制其中一个接收电路10中的选择电路122从多个滤波 器中选择带宽最宽的滤波器与处理电路11连接，获得多载波信号对应的滤波信号。
可以理解地，接收电路10的数量由载波信号的数量以及需要获得的解调信号的数量来确定，例如，载波信号的数量大于3个，则接收电路10的数量至少为3个且小于或等于载波信号的数量，若仅仅是为了将强信号与其他载波信号分离，则解调信号的数量最多为3个，此时可以只设置3个接收电路10，若是为了对强信号及其他载波信号中不同频段的载波信号或者其他载波信号中每一个载波信号分别进行解调，则需要设置更多的接收电路10，以获得对应数量的解调信号。
在其他具体的实施例中，多个接收电路10还包括第四接收电路(图中未示出)，第四接收电路与信号处理电路20连接，其用于扫描监测是否存在强载波信号，并反馈至处理电路20，下面对第一～第四接收电路的工作原理进行具体描述。
在一具体的实施方式中，以载波信号的频率间隔为250KHz的四载波基站为例，即多载波信号包括4个载波信号，相邻两个载波信号的频率间隔为250KHz，假设接收侧某一时刻出现1路强信号，共有图5所示的四种信号组合，第一滤波器的滤波带宽为5MHz，第二滤波器的滤波带宽为1MHz，第三滤波器的滤波带宽为150KHz。为了简化信号接收处理的描述，组合1和组合4可归为同一类(组合A)，组合2和组合3可归为同一类(组合B)。
在初始状态时，第一～第四接收电路均通过选择电路122选择第二滤波器与处理电路11以及信号处理电路20连接，即选择带宽较宽的滤波器(即第二滤波器)进行滤波，通过四路接收电路接收多载波信号以及第二滤波器可以保证接收到的载波信号的完整性；然后，再通过信号处理电路20检测载波信号的信号强度并根据载波信号的信号强度确定是否对第一～第三接收电路中的滤波器进行切换，具体处理过程如下面所述。
(1)无强信号时的正常接收模式
图6所示，图6是对图3的简化，省去了图3中除滤波器和信号处理电路以外的其他电路元件，第四接收电路(图中未标识)所在的RXD2接 收通道用于扫描监测是否存在强载波信号，且使用第二滤波器进行滤波，即使用带宽较宽的滤波器，这样可以保证所有的载波信号都能通过；当无强载波信号时，比如，如图7所示，载波信号f1-f4对应的信号强度均小于预设信号强度；4个载波信号按正常接收模式进行解调，载波信号经由第一接收电路所在的RX-Main接收通道来解调，且使用第一滤波器进行滤波，以保证更多的载波信号通过，提升了接收机的灵敏度。
(2)组合A接收模式
图8所示，第四接收电路所在的RXD2接收通道用于扫描监测是否存在强载波信号，且使用第二滤波器进行滤波；以图5所示的组合1为例，当出现强载波信号时，4个载波信号分别由不同的接收通道进行解调，强载波信号f1进入第一接收电路所在的RX Main接收通道解调，选择第一滤波器，载波信号f2-f4通过第二接收电路所在的RXD0接收通道解调，且使用第二滤波器进行滤波，以确保载波信号f2-f4均能通过。
(3)组合B接收模式
图9所示，第四接收电路所在的RXD2接收通道用于扫描监测是否存在强载波信号，且使用第二滤波器进行滤波；以图5所示的组合2为例，当出现强载波信号时，4个载波信号分别由不同的接收通道进行解调，正常的载波信号f1进入第一接收电路所在的RX Main接收通道解调，且使用第三滤波器进行滤波，以滤除其他载波信号，减少干扰；强载波信号f2进入第二接收电路所在的RXD0接收通道处理，且使用第一滤波器进行滤波；正常的载波信号f3-f4进入第三接收电路所在的RXD1接收通道解调，且使用第二滤波器进行滤波，以确保载波信号f3-f4均能通过。
本实施例所提供的技术方案能够提升产品性能，提高接收机动态范围，解决多载波接收机存在的远近效应问题，使得在一体机车载、便携等应用场景下，不会出现因强信号导致阻塞灵敏度降低，避免出现远端手台通话掉字或无话音等问题。
请参阅图10，图10是本申请提供的多载波接收方法一实施例的流程示意图，该方法应用于上述实施例中的多载波接收机，多载波接收机包括信号处理电路以及分别与信号处理电路连接的多个接收电路，每一个接收 电路包括互相连接的处理电路和滤波切换电路，滤波切换电路包括选择电路和多个滤波器，多个滤波器的滤波带宽均不同，该方法包括：
步骤101：利用处理电路对多载波信号进行下变频，得到中频信号。
步骤102：利用选择电路从多个滤波器中选择其中一个滤波器对中频信号进行滤波。
较佳的，在初始状态时，第一～第四接收电路均通过选择电路选择第二滤波器与处理电路以及信号处理电路连接，即选择带宽较宽的滤波器进行滤波，通过四路接收电路接收多载波信号以及选择带宽较宽的滤波器可以保证接收到的载波信号的完整性。
步骤103：利用信号处理电路检测多滤波信号中信号强度最强的载波信号，记作强载波信号。
步骤104：在多载波信号中存在强载波信号时，控制至少两个接收电路中的选择电路选择其中一个滤波器与处理电路连接，以使得强载波信号与多载波信号中的其他载波信号分别通过不同的滤波器进行滤波。
强载波信号为信号强度大于预设信号强度的载波信号，多载波接收机的结构以及工作原理与上述多载波接收机实施例相同，在此不再赘述。
本实施例提供了一种提升宽带接收机动态范围的方法，在多载波接收机的中频接收通路上，设计多个滤波带宽不同的滤波通道，根据载波信号的最高频率和载波信号的最低频率之间的频率差，选择合适的滤波通道对载波信号进行处理，对滤波器通带之外的信号起到了抑制作用，进而改善接收机动态范围与带内阻塞指标，能够应用于通信系统中的收发信机或多载波接收机中。
以上所述仅为本申请的实施例，并非因此限制本申请的专利范围，凡是利用本申请说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本申请的专利保护范围内。
Claims (10)
- 一种多载波接收机，其中，包括：多个接收电路，每一个所述接收电路包括互相连接的处理电路和滤波切换电路，所述处理电路用于对多载波信号进行下变频，得到中频信号；所述滤波切换电路包括选择电路和多个滤波器，所述多个滤波器的滤波带宽均不同，所述选择电路用于从所述多个滤波器中选择其中一个滤波器对所述中频信号进行滤波；信号处理电路，分别与每一个所述接收电路连接，用于检测所述多载波信号中是否存在强载波信号，并在所述多载波信号中存在强载波信号时，控制至少两个接收电路中的选择电路选择其中一个滤波器与处理电路连接，以使得所述强载波信号与所述多载波信号中的其他载波信号分别通过不同的滤波器进行滤波，其中，所述强载波信号为信号强度大于预设信号强度的载波信号。
- 根据权利要求1所述的多载波接收机，其中，所述选择电路包括：第一选择电路，与所述处理电路以及所述信号处理电路连接，用于在接收到所述信号处理电路输出的第一控制信号后选择与所述第一控制信号对应的滤波器与所述处理电路连接，以将所述中频信号传输至所述滤波器；第二选择电路，与所述信号处理电路连接，用于在接收到所述信号处理电路输出的第二控制信号后选择与所述第一控制信号对应的滤波器与所述信号处理电路连接，以将所述滤波器滤波后的滤波信号传输至所述信号处理电路。
- 根据权利要求2所述的多载波接收机，其中，所述第一选择电路为第一单刀多掷开关，所述第一单刀多掷开关包括第一输入端与多个第一输出端，所述第一输入端与所述处理电路连接，所述多个第一输出端分别与所述滤波器连接；所述第二选择电路为第二单刀多掷开关，所述第二单刀多掷开关包括多个第二输入端与第二输出端，所述多个第二输入端分别与所述滤波器连接，所述第二输出端与所述信号处理电路连接。
- 根据权利要求1所述的多载波接收机，其中，所述信号处理电路还用于判断所述强载波信号的频率是否为所述多载波信号中载波信号的频率的最小值或最大值，并用于在所述强载波信号的频率为所述多载波信号中载波信号的频率的最小值或最大值时，控制其中一个接收电路中的选择电路从所述多个滤波器中选择带宽最宽的滤波器与所述处理电路连接，获得所述强载波信号对应的滤波信号，以及控制其中另一个接收电路中的选择电路从所述多个滤波器中选择与所述多载波信号中其他载波信号的带宽匹配的滤波器与所述处理电路连接，获得所述多载波信号中其他载波信号对应的滤波信号。
- 根据权利要求4所述的多载波接收机，其中，将所有所述载波信号中频率大于所述强载波信号的频率的载波信号记作第一载波信号，将所述载波信号中频率小于所述强载波信号的频率的载波信号记作第二载波信号；所述信号处理电路还用于在所述强载波信号的频率不为所述多载波信号中载波信号的频率的最小值或最大值时，控制其中一个接收电路中的选择电路从所述多个滤波器中选择与所述第一载波信号的带宽匹配的滤波器与所述处理电路连接，获得所述第一载波信号对应的滤波信号，以及用于控制其中另一个接收电路中的选择电路从所述多个滤波器中选择带宽最宽的滤波器与所述处理电路连接，获得所述强载波信号对应的滤波信号，以及用于控制其中又一个接收电路中的选择电路从所述多个滤波器中选择与所述第二载波信号的带宽匹配的滤波器与所述处理电路连接，以获得所述第二载波信号对应的滤波信号。
- 根据权利要求1所述的多载波接收机，其中，所述信号处理电路还用于在所述多载波信号中不存在强载波信号时，控制其中一个接收电路中的选择电路从所述多个滤波器中选择带宽最宽的滤波器与处理电路连接，获得所述多载波信号对应的滤波信号。
- 根据权利要求1～6任一项所述的多载波接收机，其中，所述多个滤波器中带宽最宽的滤波器的带宽大于所述多载波信号的信号带宽。
- 根据权利要求1所述的多载波接收机，其中，所述接收电路还包括模数转换器，所述信号处理电路为数字处理芯片，所述数字处理芯片与所述模数转换器以及所述选择电路连接，所述模数转换器用于对滤波信号进行模数转换处理，得到数字信号。
- 根据权利要求1所述的多载波接收机，其中，所述多载波接收机还包括天线，所述天线分别与所述多个接收电路连接，用于将接收到的所述多载波信号传输至所述多个接收电路。
- 一种多载波接收方法，其中，应用于多载波接收机，所述多载波接收机包括信号处理电路以及分别与所述信号处理电路连接的多个接收电路，每一个所述接收电路包括互相连接的处理电路和滤波切换电路，所述滤波切换电路包括选择电路和多个滤波器，所述多个滤波器的滤波带宽均不同，所述方法包括：利用所述处理电路对多载波信号进行下变频，得到中频信号；利用所述选择电路从所述多个滤波器中选择其中一个滤波器对所述中频信号进行滤波；利用所述信号处理电路检测所述多载波信号中是否存在强载波信号，并在所述多载波信号中存在强载波信号时，控制至少两个接收电路中的选择电路选择其中一个滤波器与处理电路连接，以使得所述强载波信号与所述多载波信号中的其他载波信号分别通过不同的滤波器进行滤波，其中，所述强载波信号为信号强度大于预设信号强度的载波信号。
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2021
- 2021-11-30 WO PCT/CN2021/134462 patent/WO2023097461A1/zh not_active Ceased
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| US20030216122A1 (en) * | 2002-05-17 | 2003-11-20 | Cordone Sean S. | Multiple carrier adaptive notch filter |
| CN1777073A (zh) * | 2004-11-15 | 2006-05-24 | 中兴通讯股份有限公司 | 实现多载波接收信号强度指示的装置 |
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| US20210168003A1 (en) * | 2019-12-03 | 2021-06-03 | Harris Global Communications, Inc. | Communications system having multiple spread carriers and associated methods |
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| CN117998227A (zh) * | 2024-04-02 | 2024-05-07 | 杭州海康威视数字技术股份有限公司 | 一种对讲系统、方法及装置 |
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