Full duplex communication RF wireless transceiver supporting leakage cancellation

Abstract

A full duplex communication RF wireless transceiver (100) is disclosed. The RF wireless transceiver (100) comprises a single transmit and receive antenna (110) for performing an RF transmit based on a transmit signal and generating a receive signal based on an RF receive. Further, the RF wireless transceiver (100) comprises a Quadrature Balanced Power Amplifier (QBPA) module (120), where the QBPA module (120) comprises a transmit signal port (121), an antenna port (122) connected to the antenna (110), a receive signal port (123), and a cancel signal port (124); the QBPA module (120) is configured to: receive a transmit input signal at the transmit signal port (121); receiving a receive signal at the antenna port (122); generating a transmit signal based on the transmit input signal, and outputting the transmit signal through the antenna port (122); a portion of the transmit signal is reflected to the cancellation signal port (124). The RF wireless transceiver (100) further comprises a cancellation input signal generator (130) for generating a cancellation input signal at the cancellation signal port (124) of the QPBA module (120) based on the reflected portion of the transmit signal. The QBPA module (120) is further configured to generate a cancellation signal based on the cancellation input signal and output the receive signal and the cancellation signal at the receive signal port (123) to cancel transmit leakage.

Description

Technical Field

[0001] This invention relates to wireless communication. More specifically, it relates to a full-duplex radio frequency (RF) transceiver supporting leakage cancellation in wireless communication networks (especially WLANs based on the IEEE 802.11 standard). Background Technology

[0002] WLANs (also known as Wi-Fi networks) based on the IEEE 802.11 standard are becoming increasingly widespread at an unprecedented rate. Wi-Fi networks require single-antenna RF transceivers capable of enabling full-duplex (FD), frequency division duplex (FDD), and half-duplex (HD) communication through efficient and flexible sequential self-interference cancellation (SIC). Summary of the Invention

[0003] The aim is to provide an improved full-duplex RF transceiver that supports leakage elimination in wireless communication networks, especially WLANs based on the IEEE 802.11 standard.

[0004] The foregoing and other objectives are achieved through the subject matter of the independent claims. Other implementations will be apparent from the dependent claims, the specification, and the drawings.

[0005] According to a first aspect, a full-duplex RF wireless transceiver is disclosed, wherein the RF wireless transceiver includes at least one single transmit and receive antenna, the single transmit and receive antenna being used to: perform RF transmission based on a transmit signal, and generate a receive signal based on RF reception. Furthermore, the RF wireless transceiver includes a quadrature balanced power amplifier (QBPA) module (also referred to as a QBPA front end), wherein the QBPA module includes a transmit signal port, an antenna port connected to the antenna, a receive signal port, and a cancel signal port; the QBPA module is used to: receive a transmit input signal at the transmit signal port; receive a receive signal at the antenna port; generate a transmit signal based on the transmit input signal, and output the transmit signal through the antenna port; and reflect a portion of the transmit signal to the cancel signal port. It is understood that the reflection of this portion of the transmit signal to the cancel signal port is an undesirable side effect, however, it is unavoidable. The RF wireless transceiver also includes a cancel input signal generator, the cancel input signal generator being used to: generate a cancel input signal at the cancel signal port based on the reflected portion of the transmit signal. The QBPA module is further configured to: generate a cancellation signal based on the cancellation input signal, and output the received signal and the cancellation signal at the received signal port to eliminate at least part of the TX leakage.

[0006] In another possible implementation, the cancel input signal generator includes a matched filter for generating the cancel input signal by reflecting the reflected portion of the transmitted signal received from the cancel signal port of the QBPA module back to the cancel signal port. In one implementation, the matched filter may include one or more RLC circuit elements, such as one or more resistors (R), one or more inductors (L), and / or one or more capacitors (C).

[0007] In another possible implementation, the matched filter is used to reflect the reflected portion of the transmitted signal received from the cancellation port of the QBPA module back to the cancellation port with a reflection coefficient Γ that is approximately twice the reflection coefficient of the antenna.

[0008] In another possible implementation, the cancellation input signal generator is further configured to: generate the cancellation input signal such that the cancellation signal generated by the QBPA module cancels the reflected leakage signal at the receive signal port caused by partial reflection of the transmitted signal.

[0009] In another possible implementation, the RF transceiver further includes a detector configured to: detect residual reflection leakage signal at the receive signal port, and feed back information about the residual reflection leakage signal at the receive signal port to the cancellation input signal generator, so that the cancellation input signal generator adjusts the cancellation input signal based on the information about the residual reflection leakage signal. In one implementation, the information about the residual reflection leakage signal may include the residual reflection leakage signal itself.

[0010] In another possible implementation, the QBPA module is further configured to adjust the magnitude of the portion of the transmitted signal reflected to the cancellation signal port. In one implementation, this adjustment can be achieved by adjusting the current consumption of the first power amplifier or buffer and the second power amplifier or buffer of the QBPA module, thereby causing the reflection of the transmitted signal, as described in more detail below.

[0011] In another possible implementation, the QBPA module is also used for:

[0012] Amplify a first portion of the corresponding transmitted input signal to form an amplified first portion of the transmitted input signal in a first signal path;

[0013] Amplify the first portion of the corresponding canceled input signal to form the amplified first portion of the canceled input signal in the first signal path;

[0014] Amplify the second portion of the corresponding transmitted input signal to form the amplified second portion of the transmitted input signal in the second signal path;

[0015] Amplify the second portion of the corresponding canceled input signal to form the amplified second portion of the canceled input signal in the second signal path;

[0016] The transmission signal is generated based on the first portion of the transmission input signal and the second portion of the transmission input signal;

[0017] The elimination signal is generated based on the first portion of the elimination input signal and the second portion of the elimination input signal.

[0018] In another possible implementation, the first signal path is equal to the second signal path, that is, the first signal path and the second signal path are the same; the first amplification of the first portion of the transmitted input signal and the first portion of the canceled input signal is equal to the second amplification of the second portion of the transmitted input signal and the second portion of the canceled input signal.

[0019] In another possible implementation, the QBPA module includes:

[0020] A first amplifier is arranged in the first signal path and is used to amplify the first portion of the transmitted input signal and the first portion of the canceled input signal;

[0021] A second amplifier is arranged in the second signal path and is used to amplify the second portion of the transmitted input signal and the second portion of the canceled input signal.

[0022] In another possible implementation, the QBPA module further includes a first coupler, which is used for:

[0023] The transmitted input signal is divided into a first part and a second part.

[0024] The input signal to be eliminated is divided into a first part and a second part, wherein,

[0025] The first phase difference between the first portion of the transmitted input signal and the second portion of the transmitted input signal is approximately 90°;

[0026] The second phase difference between the first portion of the eliminated input signal and the second portion of the eliminated input signal is approximately 90°.

[0027] In another possible implementation, the QBPA module includes a second coupler for: combining the amplified first portion and the amplified second portion of the transmit input signal to constructively form the transmit signal at the antenna port, and cancelling the amplified first portion and the amplified second portion of the transmit input signal at the receive port.

[0028] In another possible implementation, the second coupler of the QBPA module is further configured to: combine the amplified first portion of the canceled input signal and the amplified second portion of the canceled input signal to constructively form the canceled signal at the receiving port, and cancelively cancel the amplified first portion of the canceled input signal and the amplified second portion of the canceled input signal at the antenna port.

[0029] In another possible implementation, the second coupler of the QBPA module is further used for:

[0030] The received signal is divided into a first part and a second part, wherein the third phase difference between the first part and the second part is approximately 90°.

[0031] The first portion of the received signal is provided to the first signal path, and the second portion of the received signal is provided to the second signal path.

[0032] In another possible implementation, the second coupler of the QBPA module is further configured to: combine a first reflected portion of the received signal and a second reflected portion of the received signal to constructively form the received signal at the receiving port, and to cancel out the first reflected portion of the received signal and the second reflected portion of the received signal at the antenna port.

[0033] According to a second aspect, a method for operating a full-duplex RF wireless transceiver is provided. As described in the first aspect, the RF wireless transceiver includes at least one single transmit and receive antenna, the single transmit and receive antenna being used for: performing RF transmission based on a transmit signal, and generating a receive signal based on RF reception and a quadrature-balanced power amplifier (QBPA) module, wherein the QBPA module includes a transmit signal port, an antenna port, a receive signal port, and a cancel signal port. The method according to the second aspect includes the following steps:

[0034] The QBPA module receives the transmit input signal at its transmit signal port.

[0035] The received signal is received at the antenna port of the QBPA module;

[0036] A transmission signal is generated based on the transmission input signal, and the transmission signal is output through the antenna port of the QBPA module;

[0037] A portion of the transmitted signal is reflected to the cancellation signal port of the QBPA module;

[0038] Based on the reflected portion of the transmitted signal, a cancellation input signal is generated at the cancellation signal port of the QBPA module;

[0039] A cancellation signal is generated based on the cancellation input signal, and the received signal and the cancellation signal are output at the received signal port of the QBPA module.

[0040] The method according to the second aspect of the invention can be performed by the RF wireless transceiver according to the first aspect of the invention. Therefore, other features of the method according to the second aspect of the invention arise directly from the functionality of the RF wireless transceiver according to the second aspect of the invention and its various implementations described above and below.

[0041] Details of one or more embodiments are set forth in the accompanying drawings and the following description. Other features, objects, and advantages will be apparent from the specification, drawings, and claims. Attached Figure Description

[0042] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings, in which:

[0043] Figure 1 A schematic diagram of an RF wireless transceiver according to one embodiment is shown, the RF wireless transceiver including a QBPA module and an input signal cancellation generator in the form of a matched filter;

[0044] Figure 2 A schematic diagram illustrating the S-parameter analysis of an RF wireless transceiver according to one embodiment is shown;

[0045] Figure 3 A schematic diagram of the signal flow in an RF wireless transceiver according to one embodiment is shown, the RF wireless transceiver including a QBPA module and an input signal cancellation generator in the form of a matched filter;

[0046] Figure 4 A schematic diagram of an RF wireless transceiver according to another embodiment is shown, which includes a QBPA module and an input signal cancellation generator in the form of a matched filter;

[0047] Figure 5 A flowchart illustrating the steps of a method for operating an RF wireless transceiver according to one embodiment is shown.

[0048] In the following text, the same reference numerals refer to the same or at least functionally equivalent features. Detailed Implementation

[0049] In the following description, reference is made to the accompanying drawings, which form part of this invention, illustrating by way of description specific aspects of embodiments of the invention or aspects in which embodiments of the invention may be used. It should be understood that embodiments of the invention may be used in other aspects and may include structural or logical variations not depicted in the drawings. Therefore, the following detailed description should not be construed in a limiting sense, and the scope of the invention is defined by the appended claims.

[0050] For example, it should be understood that the disclosure relating to the described method is also applicable to the corresponding device or system used with that method, and vice versa. For example, if one or more specific method steps are described, the corresponding device may include one or more units (e.g., functional units) to perform the described one or more method steps (e.g., one unit performs one or more steps, or multiple units perform one or more of a plurality of steps respectively), even if such one or more units are not explicitly described or shown in the drawings. On the other hand, for example, if a specific apparatus is described based on one or more units (e.g., functional units), the corresponding method may include a step to implement the function of one or more units (e.g., one step implements the function of one or more units, or multiple steps implement the function of one or more of a plurality of units respectively), even if such one or more steps are not explicitly described or shown in the drawings. Furthermore, it should be understood that, unless otherwise stated, features of the various exemplary embodiments and / or aspects described herein may be combined with each other.

[0051] Figure 1 A full-duplex RF transceiver 100 according to one embodiment is shown. The RF transceiver 100 includes a single transmit and receive antenna 110, which is used to: perform RF transmission based on a transmit signal and generate a receive signal based on RF reception. To generate such transmit signals for antenna 110 and / or process such receive signals from antenna 110, the RF transceiver 100 also includes a quadrature balanced power amplifier (QBPA) module 120 (also referred to as QBPA front-end 120). Figure 1 As shown, the QBPA module 120 includes a transmit signal port 121 (i.e., the first port 121), an antenna port 122 (i.e., the second port 122), a receive signal port 123 (i.e., the third port 123), and a cancel signal port 124 (i.e., the fourth port 124).

[0052] As will be described in more detail below, QBPA module 120 is used to perform the following functions: receiving a transmit input signal at the transmit signal port (i.e., the first port 121); and receiving a receive signal at the antenna port (i.e., the second port 122).

[0053] A transmit signal is generated based on the transmit input signal and output through the antenna port (i.e., the second port 122); a portion of the transmit signal is reflected to the cancellation signal port 124. Understandably, this reflection of the transmit signal to the cancellation signal port 124 is an undesirable side effect; however, it is unavoidable. The RF transceiver 100 also includes a cancellation input signal generator 130, which is used to generate a cancellation input signal at the cancellation signal port 124 based on the reflected portion of the transmit signal. The QBPA module 120 is further used to generate a cancellation signal based on the cancellation input signal provided at the cancellation signal port 124 by the cancellation input signal generator 130, and output a receive signal and a cancellation signal at the receive signal port 123 to eliminate at least a portion of the TX leakage. As will be described in more detail below, in one embodiment, the QBPA module 120 may employ a reflective amplifier or buffer 127, 128 at its input to transmit a copy of the transmitted signal to an antenna matching filter provided by the cancellation input signal generator 130. This antenna matching filter shapes the cancellation input signal and reflects the shaped cancellation input signal back to the QBPA module 120 to cancel TX leakage. To achieve optimal broadband self-interference cancellation operation, the QBPA module 120 is configured to reflect sufficient TX signal power to the matching filter 130. In one embodiment, the cancellation input signal has a transfer function that includes a delay characteristic matching the TX leakage signal.

[0054] exist Figure 1 In the illustrated embodiment, the QBPA module 120 includes a first orthogonal coupler 125 and a second orthogonal coupler 126, as well as a first power amplifier 127 and a second power amplifier 128. Based on Figure 1 The components of the QBPA module 120, shown in the diagram, have a four-port architecture and are used to operate as follows: The transmit input signal is separated at a first quadrature coupler 125 into signals for a first power amplifier 127 and a second power amplifier 128, amplified in both power amplifiers, and then added by a second quadrature coupler 126 to cancel at the antenna port 122 and the receive signal port 123, respectively. The receive signal entering the QBPA module 120 through the antenna port 122 is separated into two signals at the second quadrature coupler 126. These two signals are reflected at the outputs of the first power amplifier 127 and the second power amplifier 128 and reconstructed at the receive signal port 123. Therefore, the RX loss can be dominated by S22 of the power amplifiers 127 and 128 and thus maximized. Further reference Figure 2 and Figure 3 ( Figure 2 It shows Figure 1S-parameter analysis of the RF wireless transceiver 100, and Figure 3 It shows Figure 1 As can be understood from the signal flow in the RF transceiver 100, the built-in primary TX-RX isolation of the QBPA module 120 is determined by two physical leakage mechanisms. The first leakage mechanism is frequency-dependent antenna reflection of the transmitted signal, which returns to the outputs of power amplifiers 127 and 128 via the same path as the received signal, and is reconstructed at the receive signal port 123 after multiplication with S22 of power amplifiers 127 and 128. The second leakage mechanism arises from amplitude and phase mismatch between power amplifiers 127 and 128 and within quadrature couplers 125 and 126, resulting in a small portion of the transmit output power being directly transmitted to the receive signal port 123. As described above, in the RF transceiver 100 according to one embodiment, these leakage components are canceled by a cancellation signal generated by the QBPA module 120 based on a cancellation input signal provided by the cancellation input signal generator 130 at the cancellation signal port 124. Further details regarding the operation of QBPA module 120 are described below, and in more detail in WO2020 / 192917A1, which is fully incorporated herein by reference.

[0055] exist Figure 1 In the illustrated embodiment, the input signal cancellation generator 130 includes a matched filter 130 for generating a canceled input signal by reflecting the reflected portion of the transmitted signal received from the cancellation signal port 124 back to the cancellation signal port 124. In one embodiment, the matched filter 130 may include one or more RLC circuit elements, such as one or more resistors (R), one or more inductors (L), and / or one or more capacitors (C). Figure 3 As shown, in one embodiment, the matched filter 130 is used to reflect the reflected portion of the transmitted signal received from the cancellation signal port 124 back to the cancellation signal port 124 with a reflection coefficient Γ that is approximately twice the reflection coefficient of the antenna 110.

[0056] As described above, the QBPA module 120 is used to: generate a cancellation signal based on the cancellation input signal provided by the cancellation input signal generator 130 at the cancellation signal port 124, and output a received signal and a cancellation signal at the received signal port 123 to eliminate at least part of the TX leakage. In one embodiment, the cancellation input signal generator 130 is further used to: generate a cancellation input signal such that the cancellation signal generated by the QBPA module 120 eliminates the reflected leakage signal at the received signal port 130 caused by the partial reflection of the transmitted signal by the antenna 110.

[0057] exist Figure 4In another embodiment shown, the RF transceiver 100 further includes a detector 150 for detecting residual reflection leakage signal at the receive signal port 123 and feeding back information about the residual reflection leakage signal at the receive signal port 123 to the cancellation input signal generator 130 to adjust the cancellation input signal. Therefore, in one embodiment, the RF transceiver 100 can implement a feedback loop to adjust the cancellation input signal generated by the cancellation input signal generator 130 to minimize residual reflection leakage signal. In one embodiment, the cancellation signal generator 130 (e.g., matched filter 130) may have an auxiliary port. The cancellation input signal can be sampled through this auxiliary port, and a digital auxiliary cancellation signal can be injected through this auxiliary port to further enhance cancellation performance, even after reaching the analog cancellation limit.

[0058] In one embodiment, the QBPA module 120 is also used to adjust the magnitude of the portion of the transmitted signal reflected to the cancellation signal port 124. In one embodiment, the QBPA module 120 can be used to adjust the current consumption of the power amplifier or buffers 127, 128.

[0059] In one embodiment, the QBPA module 120 is further configured to: amplify a first portion of the transmit input signal to form an amplified first portion of the transmit input signal in a first signal path; amplify a first portion of the cancel signal to form an amplified first portion of the cancel signal in a first signal path; amplify a second portion of the transmit input signal to form an amplified second portion of the transmit input signal in a second signal path; amplify a second portion of the cancel signal to form an amplified second portion of the cancel signal in a second signal path; generate a transmit signal based on the first portion and the second portion of the transmit input signal; and generate a cancel signal based on the first portion and the second portion of the cancel input signal.

[0060] In one embodiment, the first signal path is equal to the second signal path; the first amplification of the first portion of the transmitted input signal and the first portion of the canceled input signal is equal to the second amplification of the second portion of the transmitted input signal and the second portion of the canceled input signal. As described above, in one embodiment, the QBPA module 120 includes a first power amplifier 127 and a second power amplifier 128. The first power amplifier 127 is arranged in the first signal path and is used to amplify the first portion of the transmitted input signal and the first portion of the canceled input signal; the second power amplifier 128 is arranged in the second signal path and is used to amplify the second portion of the transmitted input signal and the second portion of the canceled input signal.

[0061] In one embodiment, the first coupler 125 of the QBPA module 120 is used to: divide the transmit input signal into a first part and a second part of the transmit input signal, and divide the cancel input signal into a first part and a second part of the cancel input signal. A first phase difference between the first part and the second part of the transmit input signal is approximately 90°, and a second phase difference between the first part and the second part of the cancel input signal is also approximately 90°.

[0062] In one embodiment, the second coupler 126 is configured to: combine an amplified first portion of the transmit input signal and an amplified second portion of the transmit input signal to constructively form a transmit signal at the antenna port 122, and to cancel out the amplified first portion and the amplified second portion of the transmit input signal at the receive port 123. In another embodiment, the second coupler 126 of the QBPA module 120 is further configured to: combine an amplified first portion of the cancel input signal and an amplified second portion of the cancel input signal to constructively form a cancel signal at the receive port 123, and to cancel out the amplified first portion and the amplified second portion of the cancel input signal at the antenna port 122.

[0063] In one embodiment, the second coupler 126 of the QBPA module 120 is further configured to: divide the received signal into a first portion and a second portion, wherein a third phase difference between the first portion and the second portion is approximately 90°; provide the first portion of the received signal to a first signal path and provide the second portion of the received signal to a second signal path. In one embodiment, the second coupler 126 of the QBPA module 120 is further configured to: combine the first reflected portion and the second reflected portion of the received signal to constructively form a received signal at the receiving port 123 and to cancel out the first reflected portion and the second reflected portion of the received signal at the antenna port 122.

[0064] In one embodiment, amplifiers or buffers 127 and 128 are identical and their inputs are completely isolated from their outputs, as can be seen from... Figure 2 and Figure 3 The SIC transfer function obtained from the above can be described as follows:

[0065] S 31 =-S 21 (Γ A S 22 +Γ S S 11 )

[0066] In this case, the elimination condition can be expressed as:

[0067] Γ S S 11 =-Γ A S 22

[0068] As described above, in one embodiment, the QBPA module input reflection should provide a sufficient and efficient portion of the transmit input signal, and this portion is directed to the reflection matched filter 130 via the input quadrature mixer 125. Sufficient signal power facilitates cancellation at the receive input port 123, and in one embodiment, this can be controlled by the QBPA module 120. As described above, in one embodiment, the QBPA module 120 can be used to adjust the current consumption of buffers 127, 128 to control S11.

[0069] In one embodiment, the reflection matched filter 130 is used to shape the reflection coefficient of the antenna according to the following relationship:

[0070] Γ SIC =–Γ Antenna ·S 22 / S 11

[0071] Furthermore, the reflected amplitude is approximately twice that of the antenna, due to S 11 ≈0.5, therefore in one embodiment, the following relationship can hold:

[0072] |Γ SIC (ω)|≈2·|Γ Antenna (ω)||

[0073] In one embodiment, the matching includes the delay characteristics of the antenna 110 to ensure tracking over the frequency bandwidth of interest.

[0074] In one embodiment, the matched filter 130 follows the following relationship over the target bandwidth:

[0075] Γ SIC (ω)=Γ Antenna (ω)·S 22 (ω) / S 11 (ω)

[0076] This may require control over the design, particularly the RF SiC circuitry, to enable tuning to cancel out characteristics and thus optimize performance within the target frequency range. Such high-resolution control (i.e., tuning) can potentially increase the depth of this cancellation. Choosing appropriate matching circuitry and configuring high-resolution tuning allows for maximizing the bandwidth (BW) within the boundaries defined by the Fano-Bode limit.

[0077] In one embodiment, the QBPA module 120 can be used to control S11 by changing the operating point of the amplifiers or buffers 127, 128, to improve the efficiency, resolution, flexibility, and accuracy of the elimination conditions, i.e.:

[0078] Γ SIC =Γ Antenna ·S 22 / S 11

[0079] In one embodiment, the RF transceiver is used to operate in half-duplex (HD) mode. In this operating mode, the RF transceiver 110 can be used to turn off the QBPA module 120 during the reception time (e.g., by turning off the power or by cutting off the current to amplifiers 127, 128), thereby enabling S 22 ≈1, achieving better RX reflection, and therefore lower RX loss and NF. During transmission time, since SIC is not required in HD operation, the QBPA module 120 can be used to achieve S... 11 ≈0 operations to minimize TX loss.

[0080] Figure 5 A flowchart illustrating the steps of a method 500 for operating an RF wireless transceiver 100 according to one embodiment is shown. Method 500 includes the following steps:

[0081] The 501 transmit input signal is received at the transmit signal port 121 of the QBPA module 120;

[0082] The 503 received signal is received at the antenna port 122 of the QBPA module 120;

[0083] A 505 transmit signal is generated based on the transmit input signal and output through the antenna port 122 of the QBPA module 120.

[0084] A portion of the transmitted signal is reflected 507 to the cancel signal port 124 of the QBPA module 120;

[0085] Based on the reflection portion of the transmitted signal, a 509 cancellation input signal is generated at the cancellation signal port 124 of the QBPA module 120;

[0086] A 511 cancellation signal is generated based on the cancellation input signal, and the received signal and cancellation signal are output at the receive signal port 123 of the QBPA module 120.

[0087] Since method 500 can be implemented by RF wireless transceiver 100, other features of method 500 are derived directly from the functionality of RF wireless transceiver 100 and its various embodiments described above and below.

[0088] Those skilled in the art should understand that “blocks” (“units”) in the various drawings (methods and apparatuses) represent or describe the functionality of embodiments of the present invention (and are not necessarily independent “units” in hardware or software), thereby equally describing the functionality or features (units are equivalent to steps) of apparatus embodiments and method embodiments.

[0089] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the described apparatus embodiments are merely exemplary. For example, the unit division is only a logical functional division, and other division methods may be used in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not performed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be implemented through some interfaces. Indirect coupling or communication connection between devices or units can be implemented electronically, mechanically, or otherwise.

[0090] The units described as separate parts may or may not be physically separate. The parts shown as units may or may not be physical units, and may be located in one location or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the embodiment scheme according to actual needs.

[0091] Furthermore, the functional units in the embodiments disclosed herein can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

Claims

1. An RF wireless transceiver (100), characterized in that, include: Antenna (110) is used to: perform RF transmission based on the transmitted signal and generate a received signal based on the RF received signal; A quadrature balanced power amplifier (QBPA) module (120), wherein the QBPA module (120) includes a transmit signal port (121), an antenna port (122) connected to the antenna (110), a receive signal port (123), and a cancel signal port (124); the QBPA module (120) is used for: The transmit input signal is received at the transmit signal port (121); Receive signal at the antenna port (122); A transmission signal is generated based on the transmission input signal, and the transmission signal is output through the antenna port (122); A portion of the transmitted signal is reflected back to the cancel signal port (124), wherein, The RF wireless transceiver (100) further includes an input cancellation signal generator (130), which is configured to: generate an input cancellation signal at the input cancellation port (124) of the QPBA module (120) based on the reflected portion of the transmitted signal, wherein, The QBPA module (120) is also used to: generate a cancellation signal based on the cancellation input signal, and output the received signal and the cancellation signal at the received signal port (123).

2. The RF wireless transceiver (100) according to claim 1, characterized in that, The cancel input signal generator (130) includes a matched filter (130) for generating the cancel input signal by reflecting the reflected portion of the transmitted signal received from the cancel signal port (124) back to the cancel signal port (124).

3. The RF wireless transceiver (100) according to claim 2, characterized in that, The matched filter (130) is used to reflect the reflected portion of the transmitted signal received from the cancel signal port (124) back to the cancel signal port (124) with a reflection coefficient approximately twice that of the antenna (110).

4. The RF wireless transceiver (100) according to any one of the preceding claims, characterized in that, The input cancellation signal generator (130) is also used to: generate the input cancellation signal so that the cancellation signal generated by the QBPA module (120) cancels the reflected leakage signal at the receiving signal port (123) caused by the partial reflection of the transmitted signal.

5. The RF wireless transceiver (100) according to claim 4, characterized in that, The RF wireless transceiver (100) further includes a detector (150) for detecting residual reflected leakage signals at the receiving signal port (123) and feeding back information about the residual reflected leakage signals at the receiving signal port (123) to the cancel input signal generator (130) to adjust the cancel input signal.

6. The RF wireless transceiver (100) according to any one of the preceding claims, characterized in that, The QBPA module (120) is also used to adjust the size of the portion of the transmitted signal reflected to the cancel signal port (124).

7. The RF wireless transceiver (100) according to any one of the preceding claims, characterized in that, The QBPA module (120) is also used for: Amplify a first portion of the transmitted input signal to form an amplified first portion of the transmitted input signal in a first signal path; Amplify the first portion of the eliminated input signal to form the amplified first portion of the eliminated input signal in the first signal path; Amplify the second portion of the transmitted input signal to form the amplified second portion of the transmitted input signal in the second signal path; Amplify the second portion of the eliminated input signal to form the amplified second portion of the eliminated input signal in the second signal path; The transmission signal is generated based on the first portion of the transmission input signal and the second portion of the transmission input signal; The elimination signal is generated based on the first portion of the elimination input signal and the second portion of the elimination input signal.

8. The RF wireless transceiver (100) according to claim 7, characterized in that, The first signal path is equal to the second signal path; the first amplification of the first part of the transmitted input signal and the first part of the canceled input signal is equal to the second amplification of the second part of the transmitted input signal and the second part of the canceled input signal.

9. The RF wireless transceiver (100) according to claim 7 or 8, characterized in that, The QBPA module (120) includes: A first amplifier (127) is arranged in the first signal path and is used to amplify the first portion of the transmitted input signal and the first portion of the canceled input signal; A second amplifier (128) is arranged in the second signal path and is used to amplify the second portion of the transmitted input signal and the second portion of the canceled input signal.

10. The RF wireless transceiver (100) according to any one of claims 7 to 9, characterized in that, The QBPA module (120) further includes a first coupler (125), which is used for: The transmitted input signal is divided into a first part and a second part. The input signal to be eliminated is divided into a first part and a second part, wherein, The first phase difference between the first portion of the transmitted input signal and the second portion of the transmitted input signal is approximately 90°; The second phase difference between the first portion of the eliminated input signal and the second portion of the eliminated input signal is approximately 90°.

11. The RF wireless transceiver (100) according to any one of claims 7 to 10, characterized in that, The QBPA module (120) includes a second coupler (126) for: combining the amplified first portion and the amplified second portion of the transmit input signal to constructively form the transmit signal at the antenna port (122), and cancelling the amplified first portion and the amplified second portion of the transmit input signal at the receiver port (123).

12. The RF wireless transceiver (100) according to claim 11, characterized in that, The second coupler (126) of the QBPA module (120) is further configured to: combine the amplified first portion of the canceled input signal and the amplified second portion of the canceled input signal to constructively form the canceled signal at the receiving port (123), and cancelively cancel the amplified first portion of the canceled input signal and the amplified second portion of the canceled input signal at the antenna port (122).

13. The RF wireless transceiver (100) according to claim 11 or 12, characterized in that, The second coupler (126) of the QBPA module (120) is also used for: The received signal is divided into a first part and a second part, wherein the third phase difference between the first part and the second part is approximately 90°. The first portion of the received signal is provided to the first signal path, and the second portion of the received signal is provided to the second signal path.

14. The RF wireless transceiver (100) according to claim 13, characterized in that, The second coupler (126) of the QBPA module (120) is further configured to: combine the first reflection portion of the received signal and the second reflection portion of the received signal to form the received signal constructively at the receiving port (123), and cancel out the first reflection portion of the received signal and the second reflection portion of the received signal at the antenna port (122).

15. A method (500) for operating an RF wireless transceiver (100), characterized in that, The RF wireless transceiver (100) includes an antenna (110) for: performing RF transmission based on a transmit signal and generating a receive signal based on an RF receive signal and a quadrature balanced power amplifier (QBPA) module (120), wherein the QBPA module (120) includes a transmit signal port (121), an antenna port (122) connected to the antenna (110), a receive signal port (123), and a cancel signal port (124); the method (500) includes: The transmit input signal (501) is received at the transmit signal port (121) of the QBPA module (120); The received signal is received (503) at the antenna port (122) of the QBPA module (120); A transmission signal (505) is generated based on the transmission input signal, and the transmission signal is output through the antenna port (122) of the QBPA module (120); A portion of the transmitted signal is reflected (507) to the cancel signal port (124) of the QBPA module (120); Based on the reflected portion of the transmitted signal, a cancellation input signal (509) is generated at the cancellation signal port (124) of the QBPA module (120); A cancellation signal is generated (511) based on the cancellation input signal, and the received signal and the cancellation signal are output at the received signal port (123) of the QBPA module (120).

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