CN115412113A - Universal receiver with adjustable frequency band and bandwidth and signal receiving method - Google Patents
Universal receiver with adjustable frequency band and bandwidth and signal receiving method Download PDFInfo
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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
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
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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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- 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
- H04B1/26—Circuits for superheterodyne receivers
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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
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- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
In order to overcome the defects in the prior art, the invention provides a programmable universal receiver with a function of adjusting a receiving frequency band and a bandwidth in real time, so as to improve the receiving detection performance of a multi-mode signal. The receiver can receive spectrum signals of different modes, so that spectrum signals of multiple modes can be effectively detected under one receiver structure. The frequency band and bandwidth can be reconstructed based on the frequency band and bandwidth adjustment of the variable pre-selection radio frequency part, the variable intermediate frequency selection part and the variable baseband sampling part, and the effective receiving of the multi-mode frequency spectrum signals in a wide frequency band range can be improved. And in order to avoid that signals in the wide frequency band spectrum can not effectively receive the signals, a frequency planning method is provided, and when each part of the receiver meets a frequency planning scheme, a mechanism for receiving the signals can be effectively carried out.
Description
Technical Field
The invention belongs to the field of software radio, and particularly relates to a universal receiver with adjustable frequency band and bandwidth.
Background
In software defined wireless communication products, a wireless receiver is generally designed by using a superheterodyne receiver or a zero intermediate frequency receiver, and a superheterodyne receiver structure is shown in fig. 1. It comprises 3 key parts: radio frequency front end part-receiving the useful signal from space through the antenna, the radio frequency filter (RF _ filter) and the image filter (IR _ filter) are used to select the useful signal, suppress the image frequency and the interference frequency, respectively; an analog frequency mixing part, namely, after the radio frequency signal is moved by a frequency mixer, an intermediate frequency signal is obtained, and an intermediate frequency filter (IF _ filter) filters out-of-band (mainly image frequency and intermodulation of each order of the frequency mixer); analog-to-digital conversion and digital intermediate frequency baseband processing part-after the analog intermediate frequency signal passes through the anti-aliasing filter, the analog intermediate frequency signal enters the ADC to be subjected to digital-to-analog conversion, and the channel selection is realized by a digital filter in the DDC. It is characterized in that: and aiming at the radio frequency band of specific signal work, a fixed local oscillator, a fixed intermediate frequency and a fixed sampling rate are adopted to realize high-selectivity filtering. Meanwhile, the requirement of the dynamic range needs to meet the power change of the required signal, and the requirement can be realized by an Automatic Gain Control (AGC) module.
With the continuous development of wireless communication systems, new standards for air interfaces of mobile communications are continuously emerging, and more communication systems operating in different frequency bands and different bandwidths are used, so that a wireless receiver is required to receive signals in a multi-standard mode. The limitation of the current receiver architecture is that the filters in the shaded area in fig. 1 are designed for a specific frequency band and bandwidth of a signal, and cannot achieve the above-mentioned multi-mode receiving goal, and different communication systems need to design receivers with different filter combinations to convert the radio frequency signal of an air interface into a digital signal for processing. In addition, these high Q filters are not conducive to integration and are costly. If the system needs to receive wireless signals of a plurality of different frequency bands, a structure mode that a plurality of receivers and a plurality of filters are in parallel is generally adopted. As shown in fig. 2.
However, the prior art still has the following significant drawbacks:
1. the efficient reception of multi-mode spectrum signals (different frequency bands and different bandwidths) under one receiver design architecture cannot be realized. Generally, in a complex spectrum environment, due to the existence of a plurality of spectrum signals of various frequency bands and various bandwidths in a spectrum space, in order to effectively select and receive a captured signal, a conventional narrow-band wireless receiver technology adopting a plurality of filters with fixed frequency bands and bandwidths for frequency selection cannot meet the requirement of a receiver requiring adjustable requirements on the frequency bands and the bandwidths.
2. The requirement for miniaturization and programmability of the receiver cannot be met. By adopting the traditional receiver design method, a plurality of receiving links coexist and are relatively independent, so that the equipment volume and the power consumption are larger, the complexity of the system is increased, and the reliability of the system is reduced. The requirements of miniaturization and real-time programming cannot be met.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a programmable universal receiver with a function of adjusting a receiving frequency band and a bandwidth in real time, so as to improve the receiving detection performance of a multi-mode signal. The receiver can receive spectrum signals of different modes, so that spectrum signals of multiple modes can be effectively detected under one receiver structure. The frequency band and bandwidth can be reconstructed based on the frequency band and bandwidth adjustment of the variable pre-selection radio frequency part, the variable intermediate frequency selection part and the variable baseband sampling part, and the effective receiving of the multi-mode frequency spectrum signals in a wide frequency band range can be improved. And in order to avoid that signals in the wide frequency band spectrum can not effectively receive the signals, a frequency planning method is provided, and when each part of the receiver meets a frequency planning scheme, a mechanism for receiving the signals can be effectively carried out.
The invention provides a frequency band and bandwidth adjustable general receiver which comprises a radio frequency filter, a linear amplifier, an image frequency filter, a frequency mixer, a radio frequency local oscillation filter, an intermediate frequency filter, an IQ demodulator, a baseband analog filter, an intermediate frequency local oscillation filter, an automatic gain control module, an analog-to-digital converter, a sampling clock module, a digital down converter, a frequency band control module, a bandwidth control module and a frequency band control module.
The generic receiver comprises 3 parts: a variable pre-selection radio frequency part, a variable intermediate frequency selection part and a variable baseband sampling part; the method comprises the steps that a multi-mode radio frequency spectrum signal from an antenna firstly enters a variable pre-selection radio frequency part, the radio frequency spectrum signal passes through a radio frequency filter, a first linear amplifier, an image frequency filter and a second linear amplifier to obtain a required spectrum signal, and the signal spectrum is moved to an intermediate frequency band through a first frequency mixer, wherein a radio frequency local oscillator is a radio frequency local oscillator signal provided by the first frequency mixer and is output to the first frequency mixer after being filtered through a radio frequency local oscillator filter; then the intermediate frequency signal enters a variable intermediate frequency selection part, the signal passes through a third linear amplifier and an intermediate frequency filter, the signal selection is carried out on the intermediate frequency filter, the required frequency spectrum signal is obtained, the frequency spectrum signal is output to an IQ demodulator, the IQ demodulator mixes the signal to zero frequency and decomposes the signal into I, Q two paths of baseband analog signals, I, Q two paths of baseband analog signals are respectively output to a first baseband analog filter and a second baseband analog filter for signal filtering processing, wherein the intermediate frequency local oscillator is the intermediate frequency local oscillator signal provided by the IQ demodulator, and the intermediate frequency local oscillator signal is output to the IQ demodulator after being filtered by the intermediate frequency local oscillator filter; finally, the two filtered baseband signals enter a variable baseband sampling part, the I signal is adjusted to a proper level after passing through a fourth linear amplifier and a first automatic gain control module, and is output to a first analog-to-digital converter to obtain a digital domain signal, and the signal reception is completed after passing through a digital down converter; the Q path signal is adjusted to a proper level after passing through a fifth linear amplifier and a second automatic gain control module, is output to a second analog-to-digital converter to obtain a digital domain signal, and is subjected to signal receiving after passing through a digital down converter; the sampling clock module provides clock signals for the first analog-to-digital converter and the second analog-to-digital converter.
The frequency control module controls the radio frequency local oscillator, the intermediate frequency local oscillator and the sampling clock module through the frequency adjusting bus; the bandwidth control module controls the bandwidths of the radio frequency filter, the image frequency filter, the radio frequency local oscillator filter, the intermediate frequency filter, the baseband filter and the intermediate frequency local oscillator filter through a bandwidth adjusting bus; the frequency band control module controls the frequency bands of the radio frequency filter, the image frequency filter, the radio frequency local oscillation filter, the intermediate frequency filter and the intermediate frequency local oscillation filter through the frequency band adjusting bus.
And the frequency band and the bandwidth of each filter are adjusted in real time to adapt to the reception of different frequency spectrum signals.
When the universal receiver receives signals, the universal receiver is started and initialized, a specific frequency band is appointed to finish the configuration of a radio frequency filter, an image frequency filter, an intermediate frequency filter, a radio frequency local oscillation filter, an intermediate frequency local oscillation filter, a radio frequency local oscillation, an intermediate frequency local oscillation and a sampling clock frequency through frequency band control, frequency control and bandwidth control, and the radio frequency filter, the image frequency filter, the intermediate frequency filter, the radio frequency local oscillation filter and the intermediate frequency local oscillation filter are set according to the maximum frequency band and bandwidth capacity.
After the initialization configuration is finished, specific requirements of signal bandwidths and frequency bands of different modes are executed, and new configuration of a radio frequency filter, an image frequency filter, an intermediate frequency filter, a radio frequency local oscillator filter, an intermediate frequency local oscillator filter, a radio frequency local oscillator, an intermediate frequency local oscillator and sampling clock frequencies is completed through frequency band control, frequency control and bandwidth control, wherein the radio frequency filter, the image frequency filter, the intermediate frequency filter, the radio frequency local oscillator filter and the intermediate frequency local oscillator filter are controlled and configured by a frequency band control module and a bandwidth control module, and a baseband filter is controlled and configured only by a bandwidth controller, so that selection of radio frequency band signals and selection of baseband analog signals are completed respectively, and effective receiving of signals is realized.
The invention has the beneficial effects that
1) A method for adjusting frequency band and bandwidth of filters in radio frequency part, intermediate frequency part and baseband part in real time is provided to adapt to receive spectrum signals of different modes by adopting a universal receiver design.
2) In order to avoid that signals cannot be effectively received by different frequency spectrums in random frequency spectrums, a frequency planning method of a receiver is provided, and when each part of the receiver meets a frequency planning scheme, a mechanism for receiving the signals can be effectively carried out.
3) The invention has strong universality, low realization cost and wide applicability.
Drawings
Fig. 1 is a schematic diagram of a conventional superheterodyne receiver.
Fig. 2 is a multi-filter combined superheterodyne receiver architecture.
Fig. 3 is a diagram illustrating the inventive concept of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present application can be more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
The receiver structure of the present invention is shown in figure 3,
the receiver receives a multi-mode radio frequency spectrum signal from an antenna, the multi-mode radio frequency spectrum signal passes through a radio frequency filter, a linear amplifier, an image frequency filter and a linear amplifier (wherein the frequency bands and the bandwidths of the radio frequency filter and the image frequency filter can be simultaneously programmed and reconstructed to adapt to spectrum signals of different modes), and the required spectrum signal is obtained after the selection of the signal. And then, moving the signal frequency spectrum to an intermediate frequency band after passing through a frequency mixer, further selecting a required frequency spectrum signal through a linear amplifier and an intermediate frequency filter with the frequency band and the bandwidth simultaneously programmable and reconstructed, and simultaneously filtering the radio frequency local oscillation signal provided for the frequency mixer through a first-level frequency band and the bandwidth simultaneously programmable radio frequency local oscillation filter to obtain a high-purity local oscillation signal. After the signals are selected by an intermediate frequency filter (the frequency band and the bandwidth of the filter are programmable at the same time), the signals enter an IQ demodulator, the signals are mixed to zero frequency and are decomposed into IQ two-path baseband analog signals, and the IQ two-path baseband analog signals need to be subjected to filtering processing of the signals by a baseband analog filter with adjustable bandwidth. The IQ demodulator needs to provide a high-purity intermediate-frequency local oscillation signal, and in order to obtain the high-purity local oscillation signal, the intermediate-frequency local oscillation signal needs to be filtered by a first-level frequency band and a bandwidth simultaneously programmable intermediate-frequency local oscillation filter. And then, the two paths of baseband signals are adjusted to proper levels through a baseband filter and an automatic gain control module, output to an analog-to-digital converter (ADC) to obtain digital domain signals, and after passing through a DDC digital down-conversion filter, the multi-mode wireless signal receiving is completed.
The frequency bands and bandwidths of filters of a radio frequency part, an intermediate frequency part and a baseband part are adjusted in real time by the receiver to adapt to receiving signals of different frequency spectrums, in order to avoid that the signals cannot be effectively received by different frequency spectrums in random frequency spectrums, frequency planning methods of different receiver parts are provided, and when a frequency planning scheme met by each part of the receiver, a mechanism for receiving the signals can be effectively carried out.
The working process is as follows:
the receiver is started, and a specific frequency band is appointed to complete the configuration of a variable frequency band and a bandwidth filter (a radio frequency filter, an image frequency filter, an intermediate frequency filter, a radio frequency local oscillator filter and an intermediate frequency local oscillator filter), a radio frequency local oscillator, an intermediate frequency local oscillator and a sampling clock frequency through a digital logic part (frequency band control, frequency control and bandwidth control). The radio frequency filter, the image frequency filter, the intermediate frequency filter, the radio frequency local oscillator filter and the intermediate frequency local oscillator filter are arranged according to the maximum frequency band and the bandwidth capacity. After the initialization configuration is finished, the specific requirements of signal bandwidths and frequency bands of different modes in the program are executed, and the new configuration of the variable frequency band and bandwidth filter (a radio frequency filter, an image frequency filter, an intermediate frequency filter, a radio frequency local oscillation filter and an intermediate frequency local oscillation filter), the radio frequency local oscillation, the intermediate frequency local oscillation and the sampling clock frequency is completed through a digital logic part (frequency band control, frequency control and bandwidth control). The method comprises the following specific steps:
1. in the receiver architecture: the radio frequency filter, the image frequency filter, the intermediate frequency filter, the radio frequency local oscillator filter and the intermediate frequency local oscillator filter are controlled and configured by the frequency band control module and the bandwidth control module. The baseband filter is controlled and configured only by the bandwidth control module. The selection of the radio frequency band signal, the selection of the radio frequency band signal and the selection of the baseband analog signal are respectively completed, and the effective receiving of the signals is realized.
2. Each part frequency plan satisfies the following scheme. Defining: the radio frequency band frequency is FRF, the intermediate frequency band frequency is FIF, the radio frequency local oscillator frequency is FRFLO, the intermediate frequency local oscillator frequency is FIFLO, and the baseband sampling frequency Fs. The planning scheme is as follows: FIF = FRF (+/-) FRFLO = FIFLO = nFs, n ≧ 5.
3. The frequency band control module completes the setting of the working frequency bands of a radio frequency filter, an image frequency filter, an intermediate frequency filter, a radio frequency local oscillator filter and an intermediate frequency local oscillator filter in the receiver. The bandwidth control module completes the setting of the working bandwidths of the radio frequency filter, the mirror frequency filter, the intermediate frequency filter, the radio frequency local oscillator filter and the intermediate frequency local oscillator filter in the receiver. And the frequency control module completes configuration setting of radio frequency local oscillation and intermediate frequency local oscillation frequencies.
Example 1
When the signal is a TD-LTE signal with a working frequency of 1.8G and a signal bandwidth of 20MHz, it is necessary to set the radio frequency filter parameter in the receiver to a central frequency of 1.8G/working bandwidth of 20MHz, the image frequency filter parameter to a central frequency of 1.8G/working bandwidth of 20MHz, the intermediate frequency filter parameter to a central frequency of 0.8G/working bandwidth of 20MHz, the radio frequency local oscillation filter parameter to a central frequency of 1G/working bandwidth of 20MHz, and the intermediate frequency local oscillation filter parameter to a central frequency of 0.8G/working bandwidth of 20MHz through the frequency band control module and the bandwidth control module, so as to complete the reception of the TD-LTE signal with a working frequency of 1.8G and a signal bandwidth of 20 MHz.
Example 2
When the signal is a 5G OFDM signal with a working frequency of 5.8G and a signal bandwidth of 100MHz, it is necessary to set the radio frequency filter parameter in the receiver to a central frequency of 5.8G/a working bandwidth of 100MHz, set the image frequency filter parameter to a central frequency of 5.8G/a working bandwidth of 100MHz, set the intermediate frequency filter parameter to a central frequency of 0.8G/a working bandwidth of 100MHz, set the radio frequency local oscillation filter parameter to a central frequency of 5G/a working bandwidth of 100MHz, set the intermediate frequency local oscillation filter parameter to a central frequency of 0.8G/a working bandwidth of 100MHz through the frequency band control module and the bandwidth control module, and complete receiving the 5G OFDM signal with a working frequency of 5.8G and a signal bandwidth of 100 MHz.
The present invention is not limited to the above-described specific embodiments, and various modifications and variations are possible. Any modifications, equivalents, improvements and the like made to the above embodiments in accordance with the technical spirit of the present invention should be included in the scope of the present invention.
Claims (3)
1. A universal receiver with adjustable frequency band and bandwidth, characterized by: the device comprises a radio frequency filter, a linear amplifier, an image frequency filter, a frequency mixer, a radio frequency local oscillation filter, an intermediate frequency filter, an IQ demodulator, a baseband analog filter, an intermediate frequency local oscillation filter, an automatic gain control module, an analog-to-digital converter, a sampling clock module, a digital down converter, a frequency band control module, a bandwidth control module and a frequency band control module;
the generic receiver comprises 3 parts: a variable pre-selection radio frequency part, a variable intermediate frequency selection part and a variable baseband sampling part; the method comprises the steps that a multi-mode radio frequency spectrum signal from an antenna firstly enters a variable pre-selection radio frequency part, the radio frequency spectrum signal passes through a radio frequency filter, a first linear amplifier, an image frequency filter and a second linear amplifier to obtain a required spectrum signal, and the signal spectrum is moved to an intermediate frequency band through a first frequency mixer, wherein a radio frequency local oscillator is a radio frequency local oscillator signal provided by the first frequency mixer and is output to the first frequency mixer after being filtered through a radio frequency local oscillator filter; then the intermediate frequency signal enters a variable intermediate frequency selection part, the signal passes through a third linear amplifier and an intermediate frequency filter, the signal is selected by the intermediate frequency filter to obtain a required frequency spectrum signal, the frequency spectrum signal is output to an IQ demodulator, the IQ demodulator mixes the signal to zero frequency and decomposes the signal into I, Q two paths of baseband analog signals, I, Q two paths of baseband analog signals are respectively output to a first baseband analog filter and a second baseband analog filter to carry out signal filtering processing, wherein the intermediate frequency local oscillator is an intermediate frequency local oscillator signal provided by the IQ demodulator, and the intermediate frequency local oscillator signal is filtered by an intermediate frequency local oscillator filter and then output to the IQ demodulator; finally, the two filtered baseband signals enter a variable baseband sampling part, the I-path signal is adjusted to a proper level after passing through a fourth linear amplifier and a first automatic gain control module and is output to a first analog-to-digital converter to obtain a digital domain signal, and the signal is received after passing through a digital down converter; the Q path signal is adjusted to a proper level after passing through a fifth linear amplifier and a second automatic gain control module, is output to a second analog-to-digital converter to obtain a digital domain signal, and is subjected to signal receiving after passing through a digital down converter; the sampling clock module provides clock signals for the first analog-to-digital converter and the second analog-to-digital converter;
the frequency control module controls the radio frequency local oscillator, the intermediate frequency local oscillator and the sampling clock module through the frequency adjusting bus; the bandwidth control module controls the bandwidths of the radio frequency filter, the image frequency filter, the radio frequency local oscillator filter, the intermediate frequency filter, the baseband filter and the intermediate frequency local oscillator filter through a bandwidth adjusting bus; the frequency band control module controls the frequency bands of the radio frequency filter, the image frequency filter, the radio frequency local oscillator filter, the intermediate frequency filter and the intermediate frequency local oscillator filter through the frequency band adjusting bus;
the frequency bands and bandwidths of the filters are adjusted in real time to adapt to the reception of different frequency spectrum signals.
2. A signal receiving method of a general receiver with adjustable frequency band and bandwidth according to claim 1, wherein:
the method comprises the steps that a receiver is started and initialized, a specific frequency band is appointed to finish configuration of a radio frequency filter, an image frequency filter, an intermediate frequency filter, a radio frequency local oscillator filter, an intermediate frequency local oscillator filter, a radio frequency local oscillator, an intermediate frequency local oscillator and a sampling clock frequency through frequency band control, frequency control and bandwidth control, and the radio frequency filter, the image frequency filter, the intermediate frequency filter, the radio frequency local oscillator filter and the intermediate frequency local oscillator filter are set according to the maximum frequency band and bandwidth capacity;
after the initialization configuration is finished, specific requirements of signal bandwidths and frequency bands of different modes are executed, and new configuration of a radio frequency filter, an image frequency filter, an intermediate frequency filter, a radio frequency local oscillator filter, an intermediate frequency local oscillator filter, a radio frequency local oscillator, an intermediate frequency local oscillator and sampling clock frequency is completed through frequency band control, frequency control and bandwidth control, wherein the radio frequency filter, the image frequency filter, the intermediate frequency filter, the radio frequency local oscillator filter and the intermediate frequency local oscillator filter are controlled and configured by a frequency band control module and a bandwidth control module, and a baseband filter is only controlled and configured by a bandwidth controller, so that selection of radio frequency band signals and selection of baseband analog signals are completed respectively, and effective receiving of signals is realized;
the frequency band control module completes the setting of the working frequency band, the bandwidth control module completes the setting of the working bandwidth, and the frequency controller completes the configuration setting of the vibration frequency.
3. A signal receiving method according to claim 2, characterized in that: defining: the frequency planning scheme of the general receiver is as follows, where the radio frequency band frequency is FRF, the intermediate frequency band frequency is FIF, the radio frequency local oscillator frequency is FRFLO, the intermediate frequency local oscillator frequency is FIFLO, and the baseband sampling frequency Fs: FIF = FRF (+/-) FRFLO = FIFLO = nFs, n ≧ 5, and signal reception can be effectively performed when each section of the general purpose receiver satisfies the frequency planning scheme.
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|---|---|---|---|---|
| US20050164662A1 (en) * | 2004-01-23 | 2005-07-28 | Chaowen Tseng | Frequency conversion in a receiver |
| US20080248765A1 (en) * | 2007-04-04 | 2008-10-09 | Micrel, Inc. | Superheterodyne Receiver with Switchable Local Oscillator Frequency and Reconfigurable IF Filter Characteristics |
| US20120147929A1 (en) * | 2010-12-10 | 2012-06-14 | Honeywell International Inc. | Wideband multi-channel receiver with fixed-frequency notch filter for interference rejection |
| CN106533472A (en) * | 2016-11-24 | 2017-03-22 | 中国科学院微电子研究所 | Ultra-wide-band general receiver |
| US20170171791A1 (en) * | 2015-12-14 | 2017-06-15 | Huawei Technologies Co., Ltd. | Reconfigurable multi-mode and multi-bands radio architecture and transceiver |
| CN114584164A (en) * | 2022-01-25 | 2022-06-03 | 北京邮电大学 | Frequency band reconfigurable radio frequency receiver front end facing multi-standard communication |
-
2022
- 2022-07-12 CN CN202210822784.0A patent/CN115412113A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050164662A1 (en) * | 2004-01-23 | 2005-07-28 | Chaowen Tseng | Frequency conversion in a receiver |
| US20080248765A1 (en) * | 2007-04-04 | 2008-10-09 | Micrel, Inc. | Superheterodyne Receiver with Switchable Local Oscillator Frequency and Reconfigurable IF Filter Characteristics |
| US20120147929A1 (en) * | 2010-12-10 | 2012-06-14 | Honeywell International Inc. | Wideband multi-channel receiver with fixed-frequency notch filter for interference rejection |
| US20170171791A1 (en) * | 2015-12-14 | 2017-06-15 | Huawei Technologies Co., Ltd. | Reconfigurable multi-mode and multi-bands radio architecture and transceiver |
| CN106533472A (en) * | 2016-11-24 | 2017-03-22 | 中国科学院微电子研究所 | Ultra-wide-band general receiver |
| CN114584164A (en) * | 2022-01-25 | 2022-06-03 | 北京邮电大学 | Frequency band reconfigurable radio frequency receiver front end facing multi-standard communication |
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Application publication date: 20221129 |