CN121000358A - High-isolation full-duplex transceiver system and control method - Google Patents
High-isolation full-duplex transceiver system and control methodInfo
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- CN121000358A CN121000358A CN202511221416.0A CN202511221416A CN121000358A CN 121000358 A CN121000358 A CN 121000358A CN 202511221416 A CN202511221416 A CN 202511221416A CN 121000358 A CN121000358 A CN 121000358A
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Abstract
本发明属于全双工通信技术领域，具体公开了一种高隔离度的全双工收发机系统及控制方法，该系统包括发射模块、接收模块和全双工基带模块，发射模块包括功放模块、第一振荡器，功放模块与全双工基带模块连接，全双工基带模块发射中频信号进入功放模块后与第一振荡器产生的频率f4的信号进行混频，被上变频至频率f3；接收模块包括第二振荡器、低噪放模块，第二振荡器与低噪放模块连接，接收模块的接收天线接收信号并输入低噪放模块与第二振荡器的信号进行混频，被下变频至频率f2，进入全双工基带模块进行数据处理。采用本技术方案，基于各模块，完全避免发射链路泄漏的自干扰对接收链路的影响，并且没有增加任何系统设计的复杂度。
This invention belongs to the field of full-duplex communication technology, specifically disclosing a high-isolation full-duplex transceiver system and control method. The system includes a transmitting module, a receiving module, and a full-duplex baseband module. The transmitting module includes a power amplifier module and a first oscillator, connected to the full-duplex baseband module. The intermediate frequency (IF) signal transmitted by the full-duplex baseband module enters the power amplifier module and is mixed with a signal at frequency f4 generated by the first oscillator, resulting in up-conversion to frequency f3 . The receiving module includes a second oscillator and a low-noise amplifier (LNOAMA) module, connected to the LNOAMA module. The receiving antenna of the receiving module receives the signal and inputs it to the LNOAMA module for mixing with the signal from the second oscillator, resulting in down-conversion to frequency f2 , which is then processed by the full-duplex baseband module. This technical solution, based on each module, completely avoids the impact of self-interference from the transmitting link leakage on the receiving link, without increasing the complexity of the system design.
Description
Technical Field
The invention belongs to the technical field of full duplex communication, and relates to a high-isolation full duplex transceiver system and a control method.
Background
Full duplex communication technology is a key technology capable of implementing simultaneous transmission and reception of signals on the same frequency. Full duplex communication is considered as an important development direction of next-generation communication because it can increase the system spectrum utilization to nearly twice under the same spectrum resources as a conventional half duplex system.
However, since the transmitter and the receiver operate simultaneously at the same frequency, the transmitted high-power signal may be coupled to the receiving end through various paths (e.g., antenna coupling, transceiver leakage, etc.), thereby generating self-interference, the strength of which is generally much higher than that of the desired received signal, severely limiting the sensitivity of the receiver and the communication performance of the overall system.
At present, various self-interference cancellation techniques have been proposed in the academia and industry, mainly including antenna isolation, analog domain cancellation, digital domain cancellation, etc., to mitigate the influence of self-interference. These methods are capable of suppressing the self-interference signal to some extent, enabling the receiver to recover the desired received signal.
But is limited by nonlinear distortion, phase noise, limited dynamic range, and other non-ideal factors of the transceiver hardware, complete cancellation of self-interference is difficult to achieve in the prior art, and residual self-interference may still be higher than the noise floor of the receiver, affecting the stability and reliability of the system. Therefore, how to radically suppress self-interference coupling, especially to solve the problem of leakage of self-interference signals inside the transceiver, becomes a key technical challenge in the design of a full duplex system.
Disclosure of Invention
The invention aims to provide a full duplex transceiver system with high isolation and a control method thereof, which are used for solving the problem of leakage of self-interference signals in a transceiver.
In order to achieve the aim, the basic scheme of the invention is that the full-duplex transceiver system with high isolation comprises a transmitting module, a receiving module and a full-duplex baseband module;
The transmitting module comprises a power amplification module and a first oscillator, the first oscillator is connected with the power amplification module, the power amplification module is connected with the Quan Shuanggong baseband module, the frequency of a transmitting signal of the full-duplex baseband module is intermediate frequency f 1, the intermediate frequency signal enters the power amplification module and then is mixed with a signal with frequency f 4 generated by the first oscillator, the frequency is up-converted to frequency f 3, and the signal enters a transmitting antenna of the transmitting module to be transmitted, and f 3＝f1+f4;
The receiving module comprises a second oscillator and a low-noise amplifier module, the second oscillator is connected with the low-noise amplifier module, the low-noise amplifier module is connected with the Quan Shuanggong baseband module, a receiving antenna of the receiving module receives a signal with frequency f 3, inputs the signal into the low-noise amplifier module, mixes with a signal with frequency f 5 generated by the second oscillator, is subjected to down-conversion to frequency f 2, and enters the full-duplex baseband module to perform data processing, and f 2＝f3-f5,f4≠f5.
The basic scheme has the working principle and beneficial effects that the technical scheme designs the transmitting and receiving signals into different frequencies in the full duplex baseband module, and designs the mixing module to mix the signals in the power amplifier and the low noise amplifier, thereby completely avoiding the leakage of self-interference signals on the baseband module circuit board. And the complexity of the system design is not increased, so that the method is beneficial to being realized in practical application.
Further, two transmitting frequency mixing channels are arranged in the power amplification module, and each transmitting frequency mixing channel comprises a first transmitting band-pass filter, an up-conversion frequency mixer, a second transmitting band-pass filter, a radio frequency driving amplifier, a third transmitting band-pass filter, a power amplifier, a high-power amplifier, a SAW (surface acoustic wave) filter and a radio frequency coupler which are sequentially connected;
The input end of the first transmitting band-pass filter is connected with the full-duplex baseband module;
The first oscillator generates a local oscillator signal and is connected to the up-conversion mixer through a transmit power divider.
The power amplifier module has simple structure and is beneficial to use.
Further, the transmitting power divider uniformly distributes local oscillation signals with the frequency of f 4 to the upper mixing channel and the lower mixing channel;
the first transmitting band-pass filter is used for gating an intermediate frequency signal with the frequency f 1 and inhibiting out-of-band interference;
The up-conversion mixer mixes the intermediate frequency signal with the frequency of f 1 with the local oscillation signal with the frequency of f 4 to generate a signal with the frequency of f 3;
the second transmitting band-pass filter is used for filtering the image frequency and spurious signals generated by mixing the signals with the gating frequency of f 3;
The radio frequency driving amplifier is used for amplifying a signal with the frequency of f 3 and providing enough driving power for the rear-stage power amplifier;
The third transmitting band-pass filter is used for cleaning the amplified signal with the frequency of f 3 and inhibiting out-of-band clutter;
the power amplifier increases the signal power to be close to the target transmitting power;
The high-power amplifier is used for finally amplifying the signal power to 1W output power;
The SAW filter is used for inhibiting harmonic waves and spurious emissions and ensuring the spectral purity of an output signal;
the radio frequency coupler is used for detecting output power and providing feedback for each device in power monitoring or closed loop protection setting, so as to meet the requirement of transmitting signals.
Further, the low-noise amplification module comprises two receiving frequency mixing channels, wherein the receiving frequency mixing channels comprise a low-noise amplifier, a first radio frequency driving amplifier, a first receiving band-pass filter, a second radio frequency driving amplifier, a second receiving band-pass filter, a down-conversion frequency mixer, a third receiving band-pass filter and a fourth receiving band-pass filter which are sequentially connected;
the second oscillator generates a local oscillator signal and is connected with the down-conversion mixer through the receiving power divider;
And the output end of the fourth receiving band-pass filter is connected with the full duplex baseband module.
The device of the low noise amplifier module is simple to connect and convenient to operate.
Further, the receiving power divider evenly distributes local oscillation signals with the frequency of f 5 to the upper mixing channel and the lower mixing channel;
The first receiving low-noise amplifier is used for amplifying the received signal with the frequency of f 3, improving the sensitivity of the system and reducing the overall noise coefficient;
The first receiving band-pass filter is used for filtering out-of-band interference and harmonic waves by gating signals with the frequency of f 3;
The first radio frequency driving amplifier and the second radio frequency driving amplifier are used for amplifying signals with frequency f 3 and providing enough driving power for the post-stage mixer;
The second receiving band-pass filter cleans up the amplified signal with the frequency of f 3 and suppresses out-of-band clutter;
The down-conversion mixer mixes a signal with frequency f 3 with a local oscillator with frequency f 5 and outputs an intermediate frequency signal with frequency f 2;
The third receiving band-pass filter is used for filtering the image frequency and spurious signals in the mixed product from the intermediate frequency signal with the gating frequency of f 2;
The fourth receiving band-pass filter is used for cleaning the intermediate frequency signal with the frequency f 2 and ensuring the spectrum purity of the output signal.
Based on the connection structure of each device, a required signal is acquired.
Further, the power amplifier further comprises two independent metal cavities, and the power amplifier module and the low-noise amplifier module are respectively arranged in the two metal cavities.
The power amplifier and the low-noise amplifier are separated, so that the leakage of self-interference with the frequency of f 3 is reduced, and the design of high isolation of the full-duplex transceiver is realized.
The invention also provides a full duplex transceiver control method based on the high isolation of the full duplex transceiver system, which comprises the following steps:
The frequency of the transmitting signal of the full duplex baseband module is designed to be intermediate frequency f 1, the intermediate frequency signal enters the power amplification module and then is mixed with the signal with the frequency f 4 generated by the first oscillator, the signal is up-converted to the required frequency f 3, and the signal enters the transmitting antenna to be transmitted, so that f 3＝f1+f4 is met;
The receiving antenna receives the signal with the frequency of f 3, the signal with the frequency of f 3 enters the low-noise amplification module and then mixes with the signal with the frequency of f 5 generated by the second oscillator, the signal is subjected to down-conversion to the required frequency of f 2, and the signal enters the full-duplex baseband module to perform data processing, so that f 2＝f3-f5 is met.
The method designs the high isolation method of the full duplex transceiver, completely avoids the influence of the self-interference of the leakage of the transmitting link on the receiving link, and does not increase the complexity of any system design.
Drawings
Fig. 1 is a schematic diagram of a high isolation full duplex transceiver system of the present invention;
fig. 2 is a schematic diagram of a power amplifier module of the high isolation full duplex transceiver system of the present invention;
Fig. 3 is a schematic diagram of the low noise amplifier module of the high isolation full duplex transceiver system of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanical or electrical, or may be in communication with each other between two elements, directly or indirectly through intermediaries, as would be understood by those skilled in the art, in view of the specific meaning of the terms described above.
The invention discloses a high-isolation full-duplex transceiver system, which comprises a transmitting module, a receiving module and a full-duplex baseband module, wherein the full-duplex baseband module can adopt the existing module structure for processing baseband signals, as shown in figure 1.
The transmitting module comprises a power amplification module and a first oscillator, the first oscillator is electrically connected with the power amplification module, the power amplification module is electrically connected with the Quan Shuanggong baseband module, the frequency of a transmitting signal of the full-duplex baseband module is intermediate frequency f 1, the intermediate frequency signal is mixed with a signal with frequency f 4 generated by the first oscillator after entering the power amplification module, the frequency is up-converted to frequency f 3, and the signal enters a transmitting antenna of the transmitting module to be transmitted, and f 3＝f1+f4. Preferably, the first oscillator may employ STUW81200 local oscillator sources (Local Osci l lator Generator) which may generate a stable 4053MHz local oscillator signal for provision to the mixer.
The receiving module comprises a second oscillator and a low-noise amplifier module, the second oscillator is electrically connected with the low-noise amplifier module, the low-noise amplifier module is electrically connected with the Quan Shuanggong baseband module, a receiving antenna of the receiving module receives a signal with frequency f 3, inputs the signal into the low-noise amplifier module, mixes with a signal with frequency f 5 generated by the second oscillator, is subjected to down-conversion to frequency f 2, and enters the full-duplex baseband module for data processing, and f 2＝f3-f5,f4≠f5. Preferably, the second oscillator uses STUW81200 local oscillator sources (Local Osci l lator Generator) to generate a stable 3450MHz local oscillator signal for the mixer.
The invention designs the transmitting and receiving signals into different frequencies in the full duplex baseband module, and designs the mixing module to mix the signals in the power amplifier and the low noise amplifier, thereby completely avoiding the leakage of the self-interference signal on the circuit board of the baseband module.
In a preferred scheme of the invention, as shown in fig. 2, two transmitting frequency mixing channels are arranged in the power amplification module, and each transmitting frequency mixing channel comprises a first transmitting band-pass filter, an up-conversion frequency mixer, a second transmitting band-pass filter, a radio frequency driving amplifier, a third transmitting band-pass filter, a power amplifier, a high-power amplifier, a SAW filter and a radio frequency coupler which are sequentially connected. The two channels are respectively corresponding to the output vertical polarized signal and the horizontal polarized signal, so that the polarization state of the transmitted signal can be flexibly adjusted.
The input end of the first transmitting band-pass filter is electrically connected with the full duplex baseband module, and the first oscillator generates local oscillation signals and is electrically connected with the up-conversion mixer through a transmitting Power Divider (Power Divider).
In a preferred scheme of the invention, the transmitting power divider uniformly distributes local oscillation signals with frequency f 4 to the upper mixing channel and the lower mixing channel. The transmitting power Divider can adopt LC-Divider to uniformly distribute 4053MHz local oscillation signals to the upper and lower mixing channels.
And the first transmitting Band-pass filter (Band PASS FILTER) is used for gating the intermediate frequency signal with the frequency f 1 and inhibiting out-of-Band interference. The first transmit bandpass filter may use B5159, optionally gating 1747MHz intermediate frequency signals, to suppress out-of-band interference.
An up-conversion mixer (Upconversion Mixer) mixes the intermediate frequency signal at frequency f 1 with a local oscillator signal at frequency f 4 to generate a signal at frequency f 3. The up-conversion mixer can select LTC5549 IUDB # TRMPBF, and can mix 1747MHz intermediate frequency signal with 4053MHz local oscillator to generate 5800MHz signal.
And the second transmitting band-pass filter is used for gating the signal with the frequency f 3 and filtering the image frequency and spurious signals generated by mixing. The second transmitting band-pass filter can adopt M.B5800-150, can gate 5800MHz signal and filter image frequency and spurious signals generated by mixing.
A radio frequency driver amplifier (RF DRIVER AMPLIFIER), optionally QPL9504TR7, is used to amplify a signal with frequency f 3 (e.g., 5800 MHz) to provide sufficient driving power for the subsequent power amplifier.
The third transmitting band-pass filter can adopt 5515BP15C975E for further cleaning the amplified signal with frequency f 3 and inhibiting out-of-band clutter.
A Power Amplifier (SE 5004L) or the like, increases the signal Power to near the target transmit Power.
A high Power amplifier (Final Power AMPL IFIER), such as GTAH35012PD, etc., finally amplifies the signal Power to 1W output Power.
SAW filters (Surface Acoustic emission WAVE FI LTER), selected but not limited to SHSA6Z5.8AB, are used to suppress harmonics and spurious, ensuring the spectral purity of the output signal.
A radio frequency coupler (Directional Coupler), such as RF50-10T0525, etc., is used to detect the output power and provide feedback for power monitoring or closed loop protection.
In a preferred scheme of the invention, as shown in fig. 3, the low noise amplification module comprises two receiving and mixing channels, and the receiving and mixing channels comprise a low noise amplifier, a first radio frequency driving amplifier, a first receiving band-pass filter, a second radio frequency driving amplifier, a second receiving band-pass filter, a down-conversion mixer, a third receiving band-pass filter and a fourth receiving band-pass filter which are sequentially connected;
the second oscillator generates local oscillation signals and is electrically connected with the down-conversion mixer through the receiving power divider, and the output end of the fourth receiving band-pass filter is electrically connected with the full-duplex baseband module.
In a preferred scheme of the invention, a receiving power Divider (such as LC-Divider and the like) uniformly distributes local oscillation signals with frequency f 5 (such as 3450 MHz) to an upper mixing channel and a lower mixing channel.
A first receive low noise amplifier (Low Noise Amplifier) for amplifying the received signal at frequency f 3, increasing the system sensitivity and reducing the overall noise figure. The first receive low noise amplifier may amplify the received 5800MHz signal using SKY16602-632 LF.
A first receive bandpass filter (e.g., m.b5800-150, etc.) for gating signals at frequency f 3 (e.g., 5800 MHz), filtering out-of-band interference and harmonics.
A first rf driver amplifier and a second rf driver amplifier (RF DRIVER AMPLIFIER) for amplifying a signal having a frequency f 3 to provide sufficient driving power for the subsequent mixer. The first and second radio frequency driven amplifiers are preferably, but not limited to, QPL9504TR7 for amplifying 5800MHz signals.
The second receiving bandpass filter (e.g., 5515BP15C 975E) cleans up the amplified signal at frequency f 3, suppressing out-of-band clutter.
A down-conversion mixer (Downconversion Mixer) mixes the signal with frequency f 3 with a local oscillator with frequency f 5, and outputs an intermediate frequency signal with frequency f 2. The down-conversion mixer can use LTC5549 IUDB # TRMPBF and the like to mix 5800MHz signal with 3450MHz local oscillator and output 2350MHz intermediate frequency signal.
And a third receiving bandpass filter (such as B5133, etc.) for gating the intermediate frequency signal with the frequency f 2 (such as 2350 MHz), and filtering the image frequency and spurious signals in the mixed product.
And a fourth receiving band-pass filter (such as LFCG-3800+), which is used for further cleaning the intermediate frequency signal with frequency f 2 (such as 2350 MHz) so as to ensure the spectral purity of the output signal.
In a preferred scheme of the invention, the high-isolation full-duplex transceiver system further comprises two independent metal cavities, and the power amplification module and the low-noise amplification module are respectively arranged in the two metal cavities. The power amplifier and the low-noise amplifier are separated in the transceiver and shielded by the metal cavity, so that the influence of leakage of the signal with the frequency f 3 is reduced.
The signals with the frequencies f 1 and f 2 are in different frequency bands, so that the interference of the signals before the transmitting link enters the power amplifier to the signals after the receiving link is subjected to low-noise amplification output is completely avoided, and the high isolation of the full-duplex transceiver is realized.
For further validation, actual measurements were performed and the results are shown in table 1:
TABLE 1 actual measurement results
| Transmitting power | 20dBm | 30dBm |
| Isolation (design method not proposed by the invention) | 128dB | 119dB |
| Isolation (design method proposed by the invention) | 107dB | 96dB |
The design method is not proposed in the actual measurement, and the frequency of the signal transmitted by the full duplex baseband module and the frequency of the signal received by the full duplex baseband module are designed to be the same frequency, namely f 1＝f2. It can be seen that the proposed design method can increase the isolation by about 20dB under different transmitting powers, thereby effectively improving the communication performance of the full duplex transceiver.
The invention also provides a control method of the full duplex transceiver with high isolation based on the system, which completely avoids the influence of the self-interference of the leakage of the transmitting link on the receiving link and does not increase the complexity of the design of any system. The control method of the full duplex transceiver with high isolation comprises the following steps:
The frequency of the transmitting signal of the full duplex baseband module is designed to be intermediate frequency f 1, the intermediate frequency signal enters the power amplification module and then is mixed with the signal with the frequency f 4 generated by the first oscillator, the signal is up-converted to the required frequency f 3, and the signal enters the transmitting antenna to be transmitted, so that f 3＝f1+f4 is met;
The receiving antenna receives the signal with the frequency of f 3, the signal with the frequency of f 3 enters the low-noise amplification module and then mixes with the signal with the frequency of f 5 generated by the second oscillator, the signal is subjected to down-conversion to the required frequency of f 2, and the signal enters the full-duplex baseband module to perform data processing, so that f 2＝f3-f5 is met.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (7)
1. The full duplex transceiver system with high isolation is characterized by comprising a transmitting module, a receiving module and a full duplex baseband module;
The transmitting module comprises a power amplification module and a first oscillator, the first oscillator is connected with the power amplification module, the power amplification module is connected with the Quan Shuanggong baseband module, the frequency of a transmitting signal of the full-duplex baseband module is intermediate frequency f 1, the intermediate frequency signal enters the power amplification module and then is mixed with a signal with frequency f 4 generated by the first oscillator, the frequency is up-converted to frequency f 3, and the signal enters a transmitting antenna of the transmitting module to be transmitted, and f 3＝f1+f4;
The receiving module comprises a second oscillator and a low-noise amplifier module, the second oscillator is connected with the low-noise amplifier module, the low-noise amplifier module is connected with the Quan Shuanggong baseband module, a receiving antenna of the receiving module receives a signal with frequency f 3, inputs the signal into the low-noise amplifier module, mixes with a signal with frequency f 5 generated by the second oscillator, is subjected to down-conversion to frequency f 2, and enters the full-duplex baseband module to perform data processing, and f 2＝f3-f5,f4≠f5.
2. The high isolation full duplex transceiver system of claim 1, wherein two transmit mixing channels are provided in the power amplifier module, the transmit mixing channels comprising a first transmit bandpass filter, an up-conversion mixer, a second transmit bandpass filter, a radio frequency drive amplifier, a third transmit bandpass filter, a power amplifier, a high power amplifier, a SAW filter, and a radio frequency coupler connected in sequence;
The input end of the first transmitting band-pass filter is connected with the full-duplex baseband module;
The first oscillator generates a local oscillator signal and is connected to the up-conversion mixer through a transmit power divider.
3. The high isolation full duplex transceiver system of claim 2, wherein said transmit power divider distributes local oscillator signals having a frequency of f 4 evenly to both upper and lower mixing channels;
the first transmitting band-pass filter is used for gating an intermediate frequency signal with the frequency f 1 and inhibiting out-of-band interference;
The up-conversion mixer mixes the intermediate frequency signal with the frequency of f 1 with the local oscillation signal with the frequency of f 4 to generate a signal with the frequency of f 3;
the second transmitting band-pass filter is used for filtering the image frequency and spurious signals generated by mixing the signals with the gating frequency of f 3;
The radio frequency driving amplifier is used for amplifying a signal with the frequency of f 3 and providing enough driving power for the rear-stage power amplifier;
The third transmitting band-pass filter is used for cleaning the amplified signal with the frequency of f 3 and inhibiting out-of-band clutter;
the power amplifier increases the signal power to be close to the target transmitting power;
The high-power amplifier is used for finally amplifying the signal power to 1W output power;
The SAW filter is used for inhibiting harmonic waves and spurious emissions and ensuring the spectral purity of an output signal;
The radio frequency coupler is used for detecting output power and providing feedback for power monitoring or closed loop protection.
4. The high isolation full duplex transceiver system of claim 1, wherein said low noise amplifier module comprises two receive mixer channels, said receive mixer channels comprising a low noise amplifier, a first radio frequency drive amplifier, a first receive bandpass filter, a second radio frequency drive amplifier, a second receive bandpass filter, a down-conversion mixer, a third receive bandpass filter, and a fourth receive bandpass filter connected in sequence;
the second oscillator generates a local oscillator signal and is connected with the down-conversion mixer through the receiving power divider;
And the output end of the fourth receiving band-pass filter is connected with the full duplex baseband module.
5. The high isolation full duplex transceiver system according to claim 4, wherein said receive power divider distributes local oscillator signals having a frequency of f 5 evenly to both upper and lower mixing channels;
The first receiving low-noise amplifier is used for amplifying the received signal with the frequency of f 3, improving the sensitivity of the system and reducing the overall noise coefficient;
The first receiving band-pass filter is used for filtering out-of-band interference and harmonic waves by gating signals with the frequency of f 3;
The first radio frequency driving amplifier and the second radio frequency driving amplifier are used for amplifying signals with frequency f 3 and providing enough driving power for the post-stage mixer;
The second receiving band-pass filter cleans up the amplified signal with the frequency of f 3 and suppresses out-of-band clutter;
The down-conversion mixer mixes a signal with frequency f 3 with a local oscillator with frequency f 5 and outputs an intermediate frequency signal with frequency f 2;
The third receiving band-pass filter is used for filtering the image frequency and spurious signals in the mixed product from the intermediate frequency signal with the gating frequency of f 2;
The fourth receiving band-pass filter is used for cleaning the intermediate frequency signal with the frequency f 2 and ensuring the spectrum purity of the output signal.
6. The high isolation full duplex transceiver system of claim 1, further comprising two independent metal cavities, said power amplifier module and low noise amplifier module being disposed within each of the two metal cavities.
7. A method of controlling a full duplex transceiver based on a high isolation of a full duplex transceiver system according to any of claims 1-6, comprising the steps of:
The frequency of the transmitting signal of the full duplex baseband module is designed to be intermediate frequency f 1, the intermediate frequency signal enters the power amplification module and then is mixed with the signal with the frequency f 4 generated by the first oscillator, the signal is up-converted to the required frequency f 3, and the signal enters the transmitting antenna to be transmitted, so that f 3＝f1+f4 is met;
The receiving antenna receives the signal with the frequency of f 3, the signal with the frequency of f 3 enters the low-noise amplification module and then mixes with the signal with the frequency of f 5 generated by the second oscillator, the signal is subjected to down-conversion to the required frequency of f 2, and the signal enters the full-duplex baseband module to perform data processing, so that f 2＝f3-f5 is met.
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