A radio frequency system

Abstract

Embodiments of the present application disclose a radio frequency system. The radio frequency system comprises: a radio frequency transceiver configured with a first transmitting port, a second transmitting port and a feedback input port; a first transmitting branch connected with the first transmitting port and used for processing a first transmitting signal output by the radio frequency transceiver; a second transmitting branch connected with the second transmitting port and used for processing a second transmitting signal output by the radio frequency transceiver; a second coupling branch coupled with the first transmitting branch and used for collecting a first feedback signal corresponding to the first transmitting signal; a fourth coupling branch coupled with the second transmitting branch and used for collecting a second feedback signal corresponding to the second transmitting signal; and a combiner comprising a first input port, a second input port and a combiner output port, wherein the first coupling branch is connected with the first input port, the second coupling branch is connected with the second input port, and the combiner output port is connected with the feedback input port.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of radio frequency communication, and in particular to a radio frequency system. BACKGROUND

[0002] With the maturity of 5G technology, operators and device manufacturers are building 5G networks across the country. In the early stage of 5G network, NSA (Non Stand Alone) and SA (Stand Alone) networking can be used to achieve E-UTRA-NR Dual Connectivity (ENDC) with LTE (Long Term Evolution) coverage. E-UTRA refers to the Evolved-UMTS (Universal Mobile Telecommunications System) Terrestrial Radio Access, and NR refers to New Radio.

[0003] When the terminal device works in the ENDC mode, the terminal device can use a coupler as a feedback receiver (FBRX) to collect feedback signals from the antenna, and use the feedback signals to detect and control the radio frequency signals transmitted by the radio frequency front-end device.

[0004] When the radio frequency system supports the transmission of radio frequency signals of multiple frequency bands, multiple FBRX signals will be generated, and a switch device needs to be used as a hardware interface for the access of the multiple FBRX signals to the radio frequency transceiver device, which has a high hardware cost. SUMMARY

[0005] To solve any of the above technical problems, embodiments of the present application provide a radio frequency system, comprising:

[0006] a radio frequency transceiver configured with a first transmission port, a second transmission port, and a feedback input port;

[0007] a first transmission branch connected to the first transmission port, configured to process a first transmission signal output by the radio frequency transceiver;

[0008] a second transmission branch connected to the second transmission port, configured to process a second transmission signal output by the radio frequency transceiver;

[0009] a second coupling branch coupled to the first transmission branch, configured to collect a first feedback signal corresponding to the first transmission signal;

[0010] A fourth coupling branch coupled with the second transmitting branch, configured to collect a second feedback signal corresponding to the second transmitting signal;

[0011] A combiner comprising a first input port, a second input port and a combiner output port, wherein the second coupling branch is connected with the first input port, the fourth coupling branch is connected with the second input port, and the combiner output port is connected with the feedback input port.

[0012] The above technical solution has the following advantages or beneficial effects:

[0013] The feedback signal received through the input port of the combiner is output through the combiner output port, achieving the purpose of transmitting the feedback signal, achieving the purpose of using the combiner as a hardware interface of the multi-path feedback signal access radio frequency transceiver device, and being able to use the combiner to replace the switch device, thereby reducing the hardware cost.

[0014] Other features and advantages of the embodiments of the present application will be described in the following description, and some will become apparent from the description, or will be understood through implementation of the embodiments of the present application. The purposes and other advantages of the embodiments of the present application can be achieved and obtained through the structures specifically pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the technical solutions of the embodiments of the present application, and constitute a part of the specification, and are used to explain the technical solutions of the embodiments of the present application together with the embodiments of the embodiments of the present application, and do not constitute a limitation on the technical solutions of the embodiments of the present application.

[0016] Figure 1 A schematic diagram of a principle of an FBRX detection scheme in a radio frequency system;

[0017] Figure 2 A schematic diagram of an FBRX detection scheme based on a Phase 7LE architecture in the related art;

[0018] Figure 3 A schematic diagram of a coupler with a fixed coupling coefficient;

[0019] Figure 4 A schematic diagram of a coupler with a fixed coupling coefficient; Figure 2 A connection schematic diagram of a coupler in the architecture shown in the figure;

[0020] Figure 5 A first schematic diagram of a radio frequency system provided by the embodiments of the present application;

[0021] FIG. 6(a) is a second schematic diagram of a radio frequency system provided by the embodiments of the present application;

[0022] Fig. 6(b) is a third schematic diagram of a radio frequency system according to an embodiment of the present application;

[0023] Fig. 6(c) is a first application schematic diagram of a radio frequency system according to an embodiment of the present application;

[0024] Figure 7 Fig. 7 is a schematic diagram of a comparison of working principles of a combiner and a SP4T according to an embodiment of the present application;

[0025] Fig. 8(a) is a fourth schematic diagram of a radio frequency system according to an embodiment of the present application;

[0026] Fig. 8(b) is a fifth schematic diagram of a radio frequency system according to an embodiment of the present application;

[0027] Fig. 8(c) is a schematic diagram of path switching according to an embodiment of the present application;

[0028] Fig. 8(d) is a second application schematic diagram of a radio frequency system according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be explained that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other at will.

[0030] Figure 1 Fig. 1 is a schematic diagram of a principle of an FBRX signal in a radio frequency system. As shown in Fig. 1, a coupler (CPL) is used to collect the FBRX signal, so as to detect and control the transmit signal, and the specific implementation manner is as follows: Figure 1

[0031] The transmit signal is generated by a waveform generator (TXWaveform), and is transmitted by an antenna after passing through a digital power amplifier (G DIGtx ) and an analog power amplifier (G tx ) of the transmit signal.

[0032] The radio frequency input interface of the CPL is used to sample the transmit signal, and the FBRX signal is output through a coupling output end.

[0033] The FBRX signal passes through an analog power amplifier (G FBRX ) of the FBRX signal, an analog-to-digital converter (ADC) and a digital power amplifier (G DIG ) of the FBRX signal in sequence, and then enters an inner loop power control (ILPC) receiver.

[0034] ​The ILPC receiver completes power control by detecting the size and quality of the FBRX signal and feeding back to the digital power amplifier (G DIGtx ) of the transmitting signal, wherein the power control includes control of the signal size and / or signal quality.

[0035] Figure 2 An illustration of the FBRX detection scheme based on the Phase 7LE architecture in the related art. As shown in FIG. 1, the radio frequency system includes three PAMIDs (PA Module integrated with Duplexer, PA filter integrated module); wherein: Figure 2

[0036] The low-band (LB) PAMID integrates the low-band (LB 2G / 3G / 4G / NR) power amplifier, filter, switch, and low-noise amplifier (LNA) for signal reception (RX) into a module.

[0037] The middle-high-band (MHB) PAMID integrates the middle-high-band (MHB 3G / 4G / NR) power amplifier, filter, switch, and RX LNA into a module.

[0038] The ultra-high-band (UHB) PAMID integrates the 5G (UHB N77 / N78 / N79) power amplifier, filter, switch, and RX LNA into a module.

[0039] Specifically, the radio frequency system includes a radio frequency transceiver 10, four transmitting branches, four CPLs, and an SP4T (Single Pole Four-Throw); wherein:

[0040] The radio frequency transceiver 10 has a first transmitting port TX1, a second transmitting port TX2, a third transmitting port TX3, and a fourth transmitting port TX4, as well as a feedback input port FB; wherein:

[0041] The first transmitting port TX1 is used to transmit LB signals, such as the B5 frequency band;

[0042] The second transmitting port TX2 is used to transmit UHB signals, such as the N77 frequency band;

[0043] The third transmitting port TX3 is used to transmit HB signals, such as the ENDC N41 frequency band;

[0044] The fourth transmitting port TX4 is used to transmit MB signals, such as the B3 signal;

[0045] ​a feedback input port FB configured to receive a feedback signal corresponding to the first radio frequency signal, the second radio frequency signal, the third radio frequency signal, or the fourth radio frequency signal.

[0046] 4 transmit branches, respectively, a first transmit branch 21, a second transmit branch 22, a third transmit branch 23, and a fourth transmit branch 24; wherein:

[0047] The first transmit branch 21 includes an LB PAMID, connected with the radio frequency transceiver 10 through a first transmit port TX1, and configured to process the LB signal;

[0048] The second transmit branch 22 includes a UHB PAMID, connected with the radio frequency transceiver 10 through a second transmit port TX2, and configured to process the UHB signal;

[0049] The third transmit branch 23 includes an MHB PAMID, connected with the radio frequency transceiver 10 through a third transmit port TX3, and configured to process the HB;

[0050] The fourth transmit branch 24 includes an MHB PAMID, connected with the radio frequency transceiver 10 through a fourth transmit port TX4, and configured to process the MB signal;

[0051] 4 CPLs, respectively, a CPL1, a CPL2, a CPL3, and a CPL4; wherein:

[0052] The CPL1 is coupled with the third transmit branch, and configured to collect the feedback signal FBRX_HB corresponding to the HB signal;

[0053] The CPL2 is coupled with the first transmit branch 21, and configured to collect the feedback signal FBRX_LB corresponding to the LB signal;

[0054] The CPL3 is coupled with the fourth transmit branch 24, and configured to collect the feedback signal FBRX_MB corresponding to the MB signal;

[0055] The CPL4 is coupled with the second transmit branch 22, and configured to collect the feedback signal FBRX_UHB corresponding to the UHB signal.

[0056] The SP4T has 4 first ends (RFIN1, RFIN2, RFIN3, and RFIN4) and 1 second end RFOUT, wherein:

[0057] The RFIN1 is connected with the CPL2, and configured to receive the feedback signal FBRX_LB;

[0058] The RFIN2 is connected with the CPL4, and configured to receive the feedback signal FBRX_UHB;

[0059] RFIN3, connected with CPL1, used for receiving feedback signal FBRX_HB;

[0060] RFIN4, connected with CPL3, used for receiving feedback signal FBRX_MB;

[0061] RFOUT, used for outputting feedback signals received by four input ports.

[0062] In the above radio frequency system, in order to ensure that the FBRX function works normally, the radio frequency system uses four CPLs, including one external CPL and three internal CPLs. Each signal has an independent CPL for FBRX detection, and finally inputs into a radio frequency transceiver (Transciver) through an SP4T.

[0063] Among them, the external CPL is CPL1, which is used for coupling processing of high frequency signals.

[0064] Figure 3 The schematic diagram of the coupling device with fixed coupling coefficient. As shown in Figure 3 , the external CPL is a passive coupler, which can only perform coupling operation. Since the working characteristics of the passive coupler determine that it has only one fixed working state, it cannot be controlled.

[0065] Among them, the internal CPL is a CPL integrated in the PAMID. When the PAMID works, the CPL has four working states, which are OFF, forward coupling (FWD), reverse coupling (REV) and bypass states, wherein:

[0066] According to different slots of different transmission frames, the transmitted signals are detected, wherein only one signal is detected each time, and the detection time can be 20us, and the working state at this time is FWD state;

[0067] When the coupler does not work, the working state is OFF state;

[0068] When the Tunner of the antenna is managed, the CPL is controlled to be in REV state;

[0069] When the coupler works as a bypass transmission device, the working state is bypass state, which can be used for cascading with other CPLs.

[0070] Figure 4 The connection schematic diagram of the coupler in the architecture shown in Figure 2 . As shown in Figure 4 , in Figure 2In the application of the shown scheme, four CPLs are connected in parallel to the SP4T, and after the combination by the SP4T, the input is input to the radio transceiver, and the CPL connection mode can be called parallel connection.

[0071] From Figure 2 and Figure 4 As can be seen from the structure shown, the above architecture has the following problems, including:

[0072] Since the radio transceiver has only one feedback input port FB, when multiple CPLs are used in the actual radio application scheme, an SP4T must be used for combination, resulting in an increase in cost.

[0073] In normal operation, when the SA signal is subjected to FBRX detection, the SP4T is only in the working state at the 20us of the CPL operation, and is in the OFF state at the rest of the time. And it will always cycle, the cycle time is 6ms, the continuous switching of the switch will produce nonlinearity, and bring a low frequency noise, that is, the noise of the transmitted signal falls in the receiving frequency band. Cause the low frequency receiving sensitivity to deteriorate.

[0074] In addition, the SP4T is a device that needs to be controlled by radio frequency, and through radio frequency software control, it works in different working states, namely OFF, ON (RFIN1, RFIN2, RFIN3, RFIN4), which will inevitably cause the consumption of electricity.

[0075] Based on the above analysis, the embodiments of the present application provide the following solutions, including:

[0076] Figure 5 The first schematic diagram of the radio frequency system provided by the embodiments of the present application is shown in the figure. Figure 5 As shown in the figure, the radio frequency system includes a radio transceiver 10, a first transmission branch 21, a second transmission branch 22, a second coupling branch 32, a fourth coupling branch 34, and a combiner 40.

[0077] The radio transceiver 10 can have multiple transmission ports, each transmission port being used to output a radio frequency signal of a different frequency band.

[0078] Specifically, the radio transceiver 10 has a first transmission port TX1 and a second transmission port TX2, wherein the first transmission port TX1 is used to output a first radio frequency signal; the second radio frequency port is used to output a second radio frequency signal. Wherein the first radio frequency signal can be a radio frequency signal of the same network, or a signal of different networks, using the first radio frequency signal and the second radio frequency signal as 4G or 5G signals, or one of the first radio frequency signal and the second radio frequency signal as a 4G signal, and the other as a 5G signal.

[0079] In addition, the radio transceiver 10 also has a feedback input port FB for receiving a feedback signal.

[0080] Specifically, the feedback input port FB can receive the first feedback signal corresponding to the first transmission signal or the second feedback signal corresponding to the second transmission signal.

[0081] The first transmission branch 21 is configured to process the first transmission signal output by the radio frequency transceiver 10.

[0082] Specifically, the first transmission branch 21 is connected with the radio frequency transceiver 10 through the first transmission port TX1, receives the first transmission signal from the first transmission port TX1, amplifies and filters the received first transmission signal, and transmits the first transmission signal.

[0083] The second transmission branch 22 is configured to process the second transmission signal output by the radio frequency transceiver 10.

[0084] Specifically, the second transmission branch 22 is connected with the radio frequency transceiver 10 through the second transmission port TX2, receives the second transmission signal from the second transmission port TX2, amplifies and filters the received second transmission signal, and transmits the second transmission signal.

[0085] The second coupling branch 32 is coupled with the first transmission branch 21 to process the received first transmission signal, obtains a signal processed by coupling as the first feedback signal, and collects the first feedback signal corresponding to the first transmission signal.

[0086] The fourth coupling branch 34 is coupled with the second transmission branch 22 to process the received second transmission signal, obtains a signal processed by coupling as the second feedback signal, and collects the second feedback signal corresponding to the second transmission signal.

[0087] The combiner 40 has a plurality of input ports and a combiner output port RFOUT.

[0088] Specifically, the combiner 40 includes a first input port RFIN1 and a second input port RFIN2, wherein the first input port RFIN1 is connected with the second coupling branch 32 to receive the first feedback signal output by the second coupling branch 32; and the second input port RFIN2 is connected with the fourth coupling branch 34 to receive the second feedback signal output by the fourth coupling branch 34.

[0089] The combiner output port RFOUT is connected with the feedback input port FB of the radio frequency transceiver 10 to output the signal received by the input port of the combiner 40 to the radio frequency transceiver 10.

[0090] The combiner 40 outputs the feedback signal received by the input port of the combiner 40.

[0091] Specifically, the combiner 40 can receive the feedback signal through one of the first input port RFIN1 and the second input port RFIN2, and output the received feedback signal to the feedback input port FB of the radio frequency transceiver 10 through the combiner output port RFOUT.

[0092] The reason why SP4T is used in the related art is to control the output of one feedback signal received at any time to the radio frequency transceiver 10. The function of the combiner 40 is to output after combining the signals received by the input port. In the radio frequency system provided in the embodiment of the present application, only one feedback signal is received by the input port of the combiner 40 at any time, so there is no need to combine multiple signals, so that the combiner 40 can replace the switch device to achieve the purpose of feedback signal transmission.

[0093] From the detection mechanism of FBRX, only one feedback signal exists at the same time. Specifically, when the radio frequency system works in SA mode, the radio frequency system has only one radio frequency signal, and correspondingly only one feedback signal, and the feedback signal received by the input port of the combiner 40 also has only one. When the radio frequency system works in NSA mode, the two NSA modes are time-sharing to execute FBRX detection, so only one feedback signal exists at any time, and the feedback signal received by the input port of the combiner 40 also has only one. Based on the detection mechanism of FBRX, the signal received by the combiner 40 has only one at any time, and there is no case of combining multiple signals,

[0094] The feedback signal received by the first input port RFIN1 and the second input port RFIN2 is output through the combiner output port RFOUT by the combiner 40, which achieves the purpose of transmitting the feedback signal, and saves the hardware cost by using the combiner 40 instead of the switch device.

[0095] FIG. 6(a) is a second schematic diagram of the radio frequency system provided in the embodiment of the present application. As shown in FIG. 6(a), the radio frequency system further includes a third transmission branch 23 and a first coupling branch 31; wherein:

[0096] The radio frequency transceiver 10 is further configured with a third transmission port TX3 for outputting a third radio frequency signal.

[0097] The third transmission branch 23 is used for processing the third transmission signal output by the radio frequency transceiver 10.

[0098] Specifically, the third transmission branch 23 is connected with the radio frequency transceiver 10 through the third transmission port TX3, receives the third transmission signal from the third transmission port TX3, and transmits the received third transmission signal after amplification and filtering.

[0099] The first coupling branch 31 is coupled with the third transmitting branch 23 to process the received third transmitting signal by coupling, and the processed signal is taken as a third feedback signal to collect the third feedback signal corresponding to the third transmitting signal.

[0100] The combiner 40 further comprises a third input port RFIN3 connected with the first coupling branch 31 to receive the third feedback signal output by the first coupling branch 31.

[0101] The combiner 40 can receive the feedback signal through one of the first input port RFIN1, the second input port RFIN2 and the third input port RFIN3, and output the received feedback signal to the feedback input port FB of the radio frequency transceiver 10 through the combiner output port RFOUT.

[0102] Fig. 6(b) is a third schematic diagram of a radio frequency system provided by an embodiment of the present application. As shown in Fig. 6(b), the radio frequency system further comprises a fourth transmitting branch 24 and a third coupling branch 33; wherein:

[0103] The radio frequency transceiver 10 is further configured with a fourth transmitting port TX4 to output a fourth radio frequency signal.

[0104] The third transmitting branch 23 is configured to process the fourth transmitting signal output by the radio frequency transceiver 10.

[0105] Specifically, the fourth transmitting branch 24 is connected with the radio frequency transceiver 10 through the fourth transmitting port TX4, receives the fourth transmitting signal from the fourth transmitting port TX4, and transmits the received fourth transmitting signal after amplification and filtering.

[0106] The third coupling branch 33 is coupled with the fourth transmitting branch 24 to process the received fourth transmitting signal by coupling, and the processed signal is taken as a fourth feedback signal to collect the fourth feedback signal corresponding to the fourth transmitting signal.

[0107] The combiner 40 further comprises a fourth input port RFIN4 connected with the third coupling branch 33 to receive the fourth feedback signal output by the third coupling branch 33.

[0108] The combiner 40 can receive the feedback signal through one of the first input port RFIN1, the second input port RFIN2, the third input port RFIN3 and the fourth input port RFIN4, and output the received feedback signal to the feedback input port FB of the radio frequency transceiver 10 through the combiner output port RFOUT.

[0109] Fig. 6(c) is a first application schematic diagram of a radio frequency system provided by the embodiment of the present application. As shown in Fig. 6(c), the radio frequency system comprises a radio frequency transceiver 10, four transmission branches, four CPLs and a combiner 40; wherein:

[0110] The radio frequency transceiver 10 has a first transmission port TX1, a second transmission port TX2, a third transmission port TX3 and a fourth transmission port TX4, and a feedback input port FB; wherein:

[0111] The first transmission port TX1 is configured to transmit an LB signal, such as a B5 frequency band;

[0112] The second transmission port TX2 is configured to transmit an UHB signal, such as an N77 frequency band;

[0113] The third transmission port TX3 is configured to transmit an HB signal, such as an ENDC N41 frequency band;

[0114] The fourth transmission port TX4 is configured to transmit an MB signal, such as a B3 signal;

[0115] The feedback input port FB is configured to receive a feedback signal corresponding to the first radio frequency signal, the second radio frequency signal, the third radio frequency signal or the fourth radio frequency signal.

[0116] The four transmission branches are respectively a first transmission branch 21, a second transmission branch 22, a third transmission branch 23 and a fourth transmission branch 24; wherein:

[0117] The first transmission branch 21 comprises an LB PAMID, which is connected with the radio frequency transceiver 10 through the first transmission port TX1 and is configured to process the LB signal;

[0118] The second transmission branch 22 comprises a UHB PAMID, which is connected with the radio frequency transceiver 10 through the second transmission port TX2 and is configured to process the UHB signal;

[0119] The third transmission branch 23 comprises an MHB PAMID, which is connected with the radio frequency transceiver 10 through the third transmission port TX3 and is configured to process the HB;

[0120] The fourth transmission branch 24 comprises an MHB PAMID, which is connected with the radio frequency transceiver 10 through the fourth transmission port TX4 and is configured to process the MB signal;

[0121] The four CPLs are respectively a first coupling device 31, a second coupling device 32, a third coupling device 33 and a fourth coupling device 34, wherein in Fig. 6(c), the first coupling device 31 is a CPL1, the second coupling device 32 is a CPL2, the third coupling device 33 is a CPL3, and the fourth coupling device 34 is a CPL4; wherein:

[0122] CPL1, coupled with the third transmitting branch 23, for collecting the feedback signal FBRX_HB corresponding to the HB signal;

[0123] CPL2, coupled with the first transmitting branch 21, for collecting the feedback signal FBRX_LB corresponding to the LB signal;

[0124] CPL3, coupled with the fourth transmitting branch 24, for collecting the feedback signal FBRX_MB corresponding to the MB signal;

[0125] CPL4, coupled with the second transmitting branch 22, for collecting the feedback signal FBRX_UHB corresponding to the UHB signal.

[0126] Combiner 40, having 4 input ports (RFIN1, RFIN2, RFIN3 and RFIN4) and 1 combined output port RFOUT, wherein:

[0127] RFIN1, connected with CPL2, for receiving the feedback signal FBRX_LB;

[0128] RFIN2, connected with CPL4, for receiving the feedback signal FBRX_UHB;

[0129] RFIN3, connected with CPL1, for receiving the feedback signal FBRX_HB;

[0130] RFIN4, connected with CPL3, for receiving the feedback signal FBRX_MB;

[0131] RFOUT, for outputting the feedback signals received by the 4 input ports.

[0132] In the structure shown in Fig. 6(c), the combiner 40 is used instead of SP4T to complete the transmission of the feedback signals of the 4 transmitting branches.

[0133] The combiner and SP4T have the following differences, including:

[0134] 1. Different losses

[0135] The more the number of combinations of the combiner, the greater the corresponding loss, but the loss of the combiner can be compensated back by FBRX calibration, so it does not affect the working effect of the combiner in the radio frequency system.

[0136] 2. Different isolation

[0137] The isolation between adjacent input ports in the combiner is 35dB. Taking Figure 6(c) as an example, the isolation between the first input port RFIN1 and the second input port RFIN2 is 35dB. The coupling of the SP4T is 45dB. Although the coupling of the combiner is lower than that of the SP4T, its isolation is sufficient to meet the requirements of the RF system.

[0138] Taking the application scenario shown in Figure 6(c) as an example, when operating in NSA mode, with frequency bands B3 and N41 and a maximum power difference of 0 + 26 dBm, the transmit power of N41 is 26 dBm, the coupling coefficient of CPL1 is 25 dB, and after coupling through CPL1, the power of the feedback signal of N41 is 1 dBm, the transmission line loss is 1 dB, and the power of PFBRX N41 leaked to the FRBX4 link is -35 dBm. Then, when coupled from CPL3 to the transmit branch of B3, its power is only -60 dBm, which is far less than the B3 TX power of 0 dBm.

[0139] 3. They work on different principles.

[0140] Figure 7 This is a schematic diagram comparing the working principles of the combiner and the SP4T. (For example...) Figure 7 As shown, one end of SP4T is connected to the coupling outputs of the four CPLs, and the other end is connected to the feedback input port FB of RF transceiver 10, with only one path being activated at a time. Combiner 40 directly combines RFIN1 to RFIN4 into a single output. In FBRX detection, only one signal exists in SA mode, while in NSA mode, the two TX signals are detected in a time-division manner, with only one signal existing at a time. Therefore, combiner 40 can completely replace SP4T.

[0141] This solution uses a combiner instead of SP4T, eliminating the need for periodic switching and preventing interference at the source, thus avoiding the deterioration of low-frequency receiver sensitivity.

[0142] When all coupled branches are connected to combiner 40, there are strict design requirements for the routing of the coupled branches, so the routing distance between the coupled branches needs to be minimized. For ease of use, a partial coupling circuit cascade method can be adopted, allowing a maximum of two FBRX links to run in parallel, and output to RF transceiver 10 through combiner 40.

[0143] Figure 8(a) is a fourth schematic diagram of the radio frequency system provided in an embodiment of this application. As shown in Figure 8(a), the radio frequency system further includes a third transmitting branch 23, a first coupling branch 31, and a second through branch; wherein:

[0144] The radio frequency transceiver 10 is also equipped with a third transmit port TX3 for outputting a third radio frequency signal.

[0145] a third transmitting branch 23, configured to process a third transmitting signal output by the radio frequency transceiver 10;

[0146] Specifically, the third transmitting branch 23 is connected with the radio frequency transceiver 10 through the third transmitting port TX3, receives the third transmitting signal from the third transmitting port TX3, amplifies and filters the received third transmitting signal, and transmits the amplified and filtered third transmitting signal.

[0147] The first coupling branch 31 is connected with the third transmitting branch 23, and is configured to process the received third transmitting signal through coupling, and take the processed signal as a third feedback signal, so as to acquire the third feedback signal corresponding to the third transmitting signal.

[0148] The second straight-through branch 52 is connected with the first coupling branch 31, and is configured to directly output the third feedback signal output by the first coupling branch 31, and output the third feedback signal to the combiner 40 through the first input port RFIN1 of the combiner 40.

[0149] The first input port RFIN1 of the combiner 40 can be connected with the second coupling branch 32 and the second straight-through branch 52, so as to receive the third feedback signal output by the second straight-through branch 52, thereby realizing that the first input port RFIN1 is switchably connected with the second straight-through branch 52 and the second coupling branch 32.

[0150] If the second straight-through branch 52 has signal transmission, the first input port RFIN1 is in a conduction state with the second straight-through branch 52, so that the second straight-through branch 52 can output the third feedback signal to the combiner 40; if the second coupling branch 32 has signal transmission, the first input port RFIN1 is in a conduction state with the second coupling branch 32, so that the second coupling branch 32 can output the first feedback signal to the combiner 40.

[0151] Specifically, when the radio frequency system works in the SA mode, the radio frequency system has only one radio frequency signal, and correspondingly has only one feedback signal. If the radio frequency signal is the first transmitting signal, the second coupling branch 32 acquires the first feedback signal corresponding to the first transmitting signal, and outputs the first feedback signal to the combiner 40 through the first input port RFIN1; if the radio frequency signal is the third transmitting signal, the first coupling branch 31 acquires the third feedback signal corresponding to the third transmitting signal, and outputs the third feedback signal to the first input port RFIN1 through the second straight-through branch 52, so that the combiner 40 receives the third feedback signal through the first input port RFIN1. It can be known from the above analysis that, when the radio frequency system works in the SA mode, the first input port RFIN1 can support the reception of the first feedback signal and the third feedback signal.

[0152] When the radio frequency system works in the NSA mode, the NSA mode two-way transmitting signals are time-sharingly executed FBRX detection, so that only one feedback signal exists at the same time. Taking two different detection time points t1 and t2 as examples, if the detection of the first transmitting signal is executed at the t1 time point, the second coupling branch 32 collects the first feedback signal corresponding to the first transmitting signal and outputs the first feedback signal to the combiner 40 through the first input port RFIN1; if the detection of the third transmitting signal is executed at the t2 time point, the first coupling branch 31 collects the third feedback signal corresponding to the third transmitting signal and outputs the third feedback signal to the first input port RFIN1 through the second straight-through branch 52, so that the combiner 40 receives the third feedback signal through the first input port RFIN1. From the above analysis, it can be known that when the radio frequency system works in the NSA mode, the first input port RFIN1 can support the reception of the first feedback signal and the third feedback signal.

[0153] From the above analysis, it can be known that the first input port RFIN1 is switchably connected with the second straight-through branch 52 and the second coupling branch 32, so that the first input port RFIN1 can receive the third feedback signal through the second straight-through branch 52 and can receive the first feedback signal through the second coupling branch 32, so that the first input port RFIN1 has the function of receiving the first feedback signal and the third feedback signal.

[0154] When the radio frequency system has three coupling branches, only two input ports of the combiner 40 are needed to complete the reception function of the three feedback signals, so that the requirement for the number of input ports of the combiner 40 is effectively reduced and the hardware cost of the combiner 40 is reduced.

[0155] Fig. 8(b) is a fifth schematic diagram of a radio frequency system provided by an embodiment of the present application. As shown in Fig. 8(b), a fourth transmitting branch 24, a third coupling branch 33 and a fourth straight-through branch 54 are provided; wherein:

[0156] The radio frequency transceiver 10 is further configured with a fourth transmitting port TX4 for outputting a fourth radio frequency signal.

[0157] The fourth transmitting branch 24 is used for processing the fourth transmitting signal output by the radio frequency transceiver 10.

[0158] Specifically, the fourth transmitting branch 24 is connected with the radio frequency transceiver 10 through the fourth transmitting port TX4, receives the fourth transmitting signal from the fourth transmitting port TX4, amplifies and filters the received fourth transmitting signal and then transmits the fourth transmitting signal.

[0159] The third coupling branch 33 couples the received fourth transmitting signal through coupling with the fourth transmitting branch 24, and the coupled signal is taken as the fourth feedback signal, so as to collect the fourth feedback signal corresponding to the fourth transmitting signal.

[0160] The fourth through branch 54 is connected with the third coupling branch 33, and is used for directly outputting the fourth feedback signal output by the third coupling branch 33 and outputting the fourth feedback signal to the combiner 40 through the first input port RFIN1 of the combiner 40.

[0161] The second input port RFIN2 is switchably connected with the fourth through branch 54 and the fourth coupling branch 34.

[0162] If the fourth through branch 54 has signal transmission, the second input port RFIN2 is in a conduction state with the fourth through branch 54, so that the fourth through branch 54 can output the fourth feedback signal to the combiner 40; if the fourth coupling branch 34 has signal transmission, the second input port RFIN2 is in a conduction state with the fourth coupling branch 34, so that the fourth coupling branch 34 can output the second feedback signal to the combiner 40.

[0163] Specifically, when the radio frequency system works in the SA mode, the radio frequency system has only one radio frequency signal, and correspondingly has only one feedback signal. If the radio frequency signal is the second transmitting signal, the fourth coupling branch 34 collects the second feedback signal corresponding to the second transmitting signal and outputs the second feedback signal to the combiner 40 through the second input port RFIN2; if the radio frequency signal is the fourth transmitting signal, the third coupling branch 33 collects the fourth feedback signal corresponding to the fourth transmitting signal and outputs the fourth feedback signal to the second input port RFIN2 through the fourth through branch 54, so that the combiner 40 receives the fourth feedback signal through the second input port RFIN2. From the above analysis, it can be known that the second input port RFIN2 can support the reception of the second feedback signal and the fourth feedback signal when the radio frequency system works in the SA mode.

[0164] When the radio frequency system works in the NSA mode, the two NSA mode transmitting signals are detected by FBRX in time division mode, so that only one feedback signal exists at the same time. Taking two different detection times as t1 time and t2 time as examples, if the detection of the second transmitting signal is performed at the t1 time, the fourth coupling branch 34 collects the second feedback signal corresponding to the second transmitting signal and outputs the second feedback signal to the combiner 40 through the second input port RFIN2; if the detection of the fourth transmitting signal is performed at the t2 time, the third coupling branch 33 collects the fourth feedback signal corresponding to the fourth transmitting signal and outputs the fourth feedback signal to the second input port RFIN2 through the fourth straight-through branch 54, so that the combiner 40 receives the fourth feedback signal through the second input port RFIN2. From the above analysis, it can be known that when the radio frequency system works in the NSA mode, the second input port RFIN2 can support the reception of the second feedback signal and the fourth feedback signal.

[0165] From the above analysis, it can be known that the second input port RFIN2 is switchably connected with the fourth straight-through branch 54 and the fourth coupling branch 34, so that the second input port RFIN2 can receive the fourth feedback signal through the fourth straight-through branch 54 and can receive the second feedback signal through the fourth coupling branch 34, and the second input port RFIN2 has the function of receiving the second feedback signal and the fourth feedback signal.

[0166] When the radio frequency system has four coupling branches, only two input ports of the combiner 40 are needed to complete the reception function of the four feedback signals, which effectively reduces the requirement for the number of input ports of the combiner 40 and reduces the hardware cost of the combiner 40.

[0167] Further, the second straight-through branch 52 and the second coupling branch 32 are integrated in the same coupling device; and / or the fourth straight-through branch 54 and the fourth coupling branch 34 are integrated in the same coupling device, so as to improve the integration of the circuit.

[0168] Specifically, the coupling device can have a signal input end, a coupling input end, a straight-through branch, a coupling branch and a coupling output end; wherein:

[0169] The signal input end is used for receiving a feedback signal;

[0170] The coupling input end is used for receiving a transmitting signal;

[0171] The straight-through branch is connected with the signal input end;

[0172] The coupling branch is connected with the coupling input end and is used for collecting a feedback signal corresponding to a transmitting signal to obtain another feedback signal;

[0173] The coupling output end is switchably connected with the through branch or the coupling branch, and is used for outputting a feedback signal or another feedback signal.

[0174] For example, if the signal input end receives a third feedback signal, the third feedback signal is output to the coupling output end through the through branch, and then is output to the first input port RFIN1 of the combiner 40 by the coupling output end; if the coupling input end receives a first transmission signal, the coupling branch collects a first feedback signal corresponding to the first transmission signal, and then outputs the first feedback signal to the coupling output end, and the coupling output end outputs the first feedback signal to the first input port RFIN1 of the combiner 40.

[0175] Similarly, the working principle of the coupling device corresponding to the fourth through branch 54 and the fourth coupling branch 34 is known, and details are not repeated here.

[0176] Furthermore, the low-frequency coupling device can be away from the combiner 40, so as to reduce the interference of the working of the combiner 40 on the coupling device.

[0177] Since the first input port RFIN1 is switchably connected with the second coupling branch 32 or the second through branch 52, and the first coupling branch 31 is connected with the first input port RFIN1 through the second through branch 52, the distance between the second coupling branch 32 and the combiner 40 is shorter than the distance between the first coupling branch 31 and the combiner 40, and thus the working frequency of the first coupling branch 31 is less than the working frequency of the second coupling branch 32, so that the low-frequency coupling device is away from the combiner 40, and the interference of the working of the combiner 40 on the coupling device is reduced.

[0178] Since the second input port RFIN2 is switchably connected with the fourth coupling branch 34 or the fourth through branch 54, and the third coupling branch 33 is connected with the second input port RFIN2 through the fourth through branch 54, the distance between the fourth coupling branch 34 and the combiner 40 is shorter than the distance between the third coupling branch 33 and the combiner 40, and thus the working frequency of the third coupling branch 33 is less than the working frequency of the fourth coupling branch 34, so that the low-frequency coupling device is away from the combiner 40, and the interference of the working of the combiner 40 on the coupling device is reduced.

[0179] The coupling device can be an active coupler. Based on the working characteristics of the active coupler, the active coupler has a through state, and thus whether the working state of the active coupler is in the through state can be controlled.

[0180] Specifically, the active coupler has a control end for receiving a branch control signal, and the branch control signal is used to enable one of the through branch and the coupling branch of the coupling device to be in a conduction state.

[0181] Further, when the bypass branch of the coupling device is enabled to be in the conducting state, the coupling device is in the pass-through state, and the coupling device is equivalent to a transmission line, directly transmitting the received signal. When the coupling branch of the coupling device is enabled to be in the conducting state, the coupling device performs the coupling operation and outputs the feedback signal obtained through the coupling process.

[0182] The coupling device can include a passive coupling device. Since the passive coupling device does not have a pass-through state and can only perform the coupling operation, the coupling device can also be a switching device.

[0183] The switching device has two first ends and a second end. One first end of the switching device is configured to receive the FBRX signal, the other first end of the switching device is connected to the coupling output end of the passive coupling device, and the second end of the switching device is configured to output the FBRX signal received by any of the first ends.

[0184] Specifically, when the first end and the second end of the switching device are in the conducting state, the coupling device is in the pass-through state and is equivalent to a transmission line, directly transmitting the received signal. When the other first end and the second end of the switching device are in the conducting state, since the other first end of the switching device is connected to the passive coupling device, the coupling device performs the coupling operation and outputs the feedback signal obtained through the coupling process.

[0185] Further, the switching device further includes:

[0186] The control interface is configured to receive a branch control signal, and the branch control signal is used to enable the first end and the second end of the switching device to be in the conducting state.

[0187] Specifically, the control interface can be a GRFC (Generic RF Controls) interface, that is, the voltage level of one port is used to control the switching direction of the switching device. For example, the high level is the bypass state, and the low level is the ON state.

[0188] FIG. 8(c) is a schematic diagram of path switching according to an embodiment of the present application. As shown in FIG. 8(c), the coupling device corresponding to the second coupling branch 32 and the second bypass branch 52 includes CPL2 and SPDT. One first end of the SPDT is connected to the coupling output end of the CPL1, the other first end of the SPDT is connected to the coupling output end of the CPL2, and the second end of the SPDT is connected to the first input port RFIN1 of the combiner 40. The bypass state is realized by controlling the switching of the SPDT.

[0189] Although both SP4T and SPDT are switching devices, they have obvious differences. The SP4T is an RFFE (RF Front-end) interface device, and the direction of the switch is controlled by register instructions. The hardware cost is high, the occupied area is large, and the power consumption is high. The SPDT device is a generic RF control (GRFC) interface device, and the direction of the switch is controlled by high and low levels. Compared with the SP4T, the SPDT has lower price, smaller occupied area and lower power consumption.

[0190] Fig. 8(d) is a second application schematic diagram of a radio frequency system provided by the embodiment of the application. As shown in Fig. 8(d), the radio frequency system comprises a radio frequency transceiver 10, four transmission branches, four CPLs and a combiner 40; wherein:

[0191] The radio frequency transceiver 10 has a first transmission port TX1, a second transmission port TX2, a third transmission port TX3 and a fourth transmission port TX4, and a feedback input port FB; wherein:

[0192] The first transmission port TX1 is used for transmitting an LB signal, such as a B5 frequency band;

[0193] The second transmission port TX2 is used for transmitting an UHB signal, such as an N77 frequency band;

[0194] The third transmission port TX3 is used for transmitting an HB signal, such as an ENDC N41 frequency band;

[0195] The fourth transmission port TX4 is used for transmitting an MB signal, such as a B3 signal;

[0196] The feedback input port FB is used for receiving a feedback signal corresponding to a first radio frequency signal, a second radio frequency signal, a third radio frequency signal or a fourth radio frequency signal.

[0197] The four transmission branches are respectively a first transmission branch 21, a second transmission branch 22, a third transmission branch 23 and a fourth transmission branch 24; wherein:

[0198] The first transmission branch 21 comprises an LB PAMID, which is connected with the radio frequency transceiver 10 through the first transmission port TX1, and is used for processing the LB signal;

[0199] The second transmission branch 22 comprises a UHB PAMID, which is connected with the radio frequency transceiver 10 through the second transmission port TX2, and is used for processing the UHB signal;

[0200] The third transmission branch 23 comprises an MHB PAMID, which is connected with the radio frequency transceiver 10 through the third transmission port TX3, and is used for processing the HB;

[0201] The fourth transmitting branch 24 comprises an MHB PAM ID, connected with the radio frequency transceiver 10 through a fourth transmitting port TX4, and is used for processing the MB signal;

[0202] 4 CPLs, which are a first coupling device 31, a second coupling device 32, a third coupling device 33 and a fourth coupling device 34, wherein in Fig. 8(d), the first coupling device 31 is CPL1, the second coupling device 32 is CPL2, the third coupling device 33 is CPL3, and the fourth coupling device 34 is CPL4; wherein:

[0203] The CPL1 is coupled with the third transmitting branch 23, and is used for collecting the feedback signal FBRX_1 corresponding to the HB signal;

[0204] The CPL3 is coupled with the fourth transmitting branch 24, and is used for collecting the feedback signal FBRX_3 corresponding to the MB signal;

[0205] The CPL2 is coupled with the first transmitting branch 21, and is used for collecting the feedback signal FBRX_2 corresponding to the LB signal; and is connected with the coupling output end of the CPL1, and is used for outputting the feedback signal FBRX_1;

[0206] The CPL4 is coupled with the second transmitting branch 22, and is used for collecting the feedback signal FBRX_UHB corresponding to the UHB signal; and is connected with the coupling output end of the CPL3, and is used for outputting the feedback signal FBRX_4.

[0207] The combiner 40 has 2 input ports (RFIN1, RFIN2) and 1 combiner output port RFOUT, wherein:

[0208] The RFIN1 is connected with the CPL2, and is used for receiving the feedback signal FBRX_1 and the feedback signal FBRX_2;

[0209] The RFIN2 is connected with the CPL4, and is used for receiving the feedback signal FBRX_3 and the feedback signal FBRX_4;

[0210] The RFOUT is used for outputting the feedback signals received by the 4 input ports.

[0211] In the structure shown in Fig. 8(d), the combiner 40 is used to replace the SP4T to complete the transmission of the feedback signals of the 4 transmitting branches.

[0212] Those of ordinary skill in the art will realize and understand that all or some of the steps in the methods disclosed above and the functional modules / units in the systems and devices can be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementation, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component can have multiple functions, or one function or step can be performed by several physical components in cooperation. Some or all of the components can be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on computer-readable media, which can include computer storage media (or non-transitory media) and communication media (or transitory media). As is well known to those of ordinary skill in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, it is common and well understood by those of ordinary skill in the art that communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and can include any information delivery media.

Claims

1. A radio frequency system, characterized by The radio frequency system comprises: a radio frequency transceiver configured with a first transmitting port, a second transmitting port and a feedback input port; a first transmitting branch connected with the first transmitting port, used for processing a first transmitting signal output by the radio frequency transceiver; a second transmitting branch connected with the second transmitting port, used for processing a second transmitting signal output by the radio frequency transceiver; a second coupling branch coupled with the first transmitting branch, used for collecting a first feedback signal corresponding to the first transmitting signal; a fourth coupling branch coupled with the second transmitting branch, used for collecting a second feedback signal corresponding to the second transmitting signal; a combiner comprising a first input port, a second input port and a combiner output port, wherein the second coupling branch is connected with the first input port, the fourth coupling branch is connected with the second input port, and the combiner output port is connected with the feedback input port; wherein the radio frequency transceiver is further configured with a third transmitting port; the radio frequency system further comprises: a third transmitting branch connected with the third transmitting port, used for processing a third transmitting signal output by the radio frequency transceiver; a first coupling branch coupled with the third transmitting branch, used for collecting a third feedback signal corresponding to the third transmitting signal; a second through branch connected with the first coupling branch; wherein the first input port is switchably connected with the second through branch and the second coupling branch.

2. The radio frequency system according to claim 1, wherein: the radio frequency transceiver is further configured with a fourth transmitting port; the radio frequency system further comprises: a fourth transmitting branch connected with the fourth transmitting port, used for processing a fourth transmitting signal output by the radio frequency transceiver; a third coupling branch coupled with the fourth transmitting branch, used for collecting a fourth feedback signal corresponding to the fourth transmitting signal; a fourth through branch connected with the third coupling branch; wherein the second input port is switchably connected with the fourth through branch and the fourth coupling branch.

3. The radio frequency system according to claim 2, wherein: the first transmitting signal is a low band (LB) signal; the second transmitting signal is an ultra high band (UHB) signal; the third transmitting signal is a high band (HB) signal; the fourth transmitting signal is a medium band (MB) signal.

4. The radio frequency system according to claim 3, wherein: a working frequency of the first coupling branch is less than a working frequency of the second coupling branch; and / or, a working frequency of the third coupling branch is less than a working frequency of the fourth coupling branch.

5. The radio frequency system according to any one of claims 2 to 4, wherein: the second through branch and the second coupling branch are integrated in a same coupling device; and / or; the fourth through branch and the fourth coupling branch are integrated in a same coupling device.

6. The radio frequency system of claim 5, wherein, the coupling device is an active coupling device; the active coupling device has a control terminal for receiving a branch control signal, the branch control signal being used for enabling one of a through branch and a coupling branch of the coupling device to be in a conductive state.

7. The radio frequency system of claim 5, wherein, The coupling device comprises a passive coupler and a switch device; wherein: The passive coupler has a coupling output end; The switch device has two first ends and one second end, wherein one first end of the switch device is used for receiving an FBRX signal, the other first end of the switch device is connected with the coupling output end of the passive coupler, and the second end of the switch device is used for outputting a feedback signal received by any first end.

8. The radio frequency system of claim 7, wherein, The switch device further comprises: A control interface is used for receiving a branch control signal, and the branch control signal is used for enabling the first end and the second end of the switch device to be in a conduction state.

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