CN109150229B - Mobile terminal and time division duplex system for controlling receiving sensitivity of TDD system - Google Patents
Mobile terminal and time division duplex system for controlling receiving sensitivity of TDD system Download PDFInfo
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- CN109150229B CN109150229B CN201811129276.4A CN201811129276A CN109150229B CN 109150229 B CN109150229 B CN 109150229B CN 201811129276 A CN201811129276 A CN 201811129276A CN 109150229 B CN109150229 B CN 109150229B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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- Signal Processing (AREA)
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- Bidirectional Digital Transmission (AREA)
Abstract
The invention discloses a mobile terminal and time division duplex system for controlling the receiving sensitivity of a TDD system, wherein the mobile terminal comprises: the receiving and transmitting device comprises a receiving and transmitting device, a downlink low-noise amplifying device, a power amplifying device and a filter, wherein a second radio-frequency bidirectional switch arranged in the power amplifying device comprises a public end, a first switch and a second switch, the public end is connected with the filter, the first switch is connected with the input end of the downlink low-noise amplifying device, the output end of the first switch is connected with the receiving end of the receiving and transmitting device, the transmitting end of the first switch is connected with the second switch, and a baseband signal controls the public end of the second radio-frequency bidirectional switch to be switched and connected to the first switch or the second switch according to the time slot state of a time division duplex system so as to form different communication paths. The invention only adds 1-stage down low noise amplifier on the receiving path between the power amplifier and the receiving/transmitting device to reduce the noise coefficient of the whole time division duplex system, so as to improve the sensitivity of TDD system and improve the user experience.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a mobile terminal and a time division duplex system for controlling the receiving sensitivity of a TDD system.
Background
Mobile terminals such as smart phones access an operator communication network, need to receive signals from a baseband, and in a working mode of a conventional TDD (Time Division Duplex) system, due to insertion loss of devices of a receiving path and transmission loss (loss) of PCB (printed circuit board) routing, the baseband signals received by an antenna are weakened before reaching a transceiver, so that the receiving sensitivity of the mobile terminal cannot be improved, and the performance is poor. Therefore, under the condition of poor receiving sensitivity, especially in remote areas covered by signals, the communication of mobile terminals such as mobile phones and the like is frequently disconnected, and the user experience is influenced.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a mobile terminal and a time division duplex system for controlling the receiving sensitivity of a TDD system, in order to overcome the above-mentioned drawbacks of the prior art, and to reduce the noise factor of the whole time division duplex system by adding a 1-stage downlink low noise amplifier to the receiving path between a power amplifier and a transceiver, so as to improve the sensitivity of the TDD system and improve the user experience.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a mobile terminal for controlling the receiving sensitivity of a TDD system, comprising a mobile terminal body, wherein a PCB is arranged in the mobile terminal body, a transceiver, a downlink low noise amplifier, a power amplifier and a filter are arranged on the PCB, the power amplifier comprises a second radio frequency bidirectional switch (301), the second radio frequency bidirectional switch (301) comprises a public terminal (RFC), a first switch (RF1) and a second switch (RF2), the public terminal (RFC) is connected with the filter, the first switch (RF1) is connected with the input end of the downlink low noise amplifier, the output end of the downlink low noise amplifier is connected with the receiving end (RX) of the transceiver, the second switch (RF2) is connected with the transmitting end (TX) of the transceiver, a baseband signal controls the public terminal (RFC) of the second radio frequency bidirectional switch (301) to be switched and connected to the first switch according to the time slot state of the TDD system A switch (RF1) or a second switch (RF2) to form a different communication path.
The mobile terminal for controlling the receiving sensitivity of the TDD system is characterized in that an antenna and a first radio frequency antenna switch connected with the antenna are further arranged on the PCB, and the first radio frequency antenna switch is connected with the filter in series.
The mobile terminal for controlling the receiving sensitivity of the TDD system is characterized in that when the TDD system is in a receiving time slot state, a baseband signal controls the public terminal (RFC) of the second radio frequency bidirectional switch (301) to be switched and connected to the first switch (RF1) to form a downlink receiving path.
The mobile terminal for controlling the receiving sensitivity of the TDD system is characterized in that when the TDD system is in a transmitting time slot state, a baseband signal controls the public terminal (RFC) of the second radio frequency bidirectional switch (301) to be switched and connected to the second switch (RF2) to form an uplink transmitting path.
The mobile terminal for controlling the receiving sensitivity of the TDD system, wherein when a downlink receiving path is turned on, a downlink signal received by the antenna is sequentially subjected to selection of the first radio frequency antenna switch, filtering and optimization processing by the filter, then input to the power amplification device for amplification, then output to the downlink low-noise amplification device for noise reduction optimization processing, and output to the transceiver device after compensating for a certain transmission loss of the downlink signal, thereby enhancing the sensitivity of the base station for receiving the downlink signal.
The mobile terminal for controlling the receiving sensitivity of the TDD system is characterized in that when an uplink receiving channel is conducted, a base station sends an uplink signal to the transceiver device, the uplink signal is output through an output end (TX) of the transceiver device, amplified by the power amplifying device, filtered and optimized by the filter, selected by the first radio frequency antenna switch and transmitted through the antenna.
The mobile terminal for controlling the receiving sensitivity of the TDD system is characterized in that the downlink low-noise amplification device is a 1-level low-noise amplifier, and the noise coefficient is 0.8 dB.
The mobile terminal for controlling the receiving sensitivity of the TDD system reduces the noise coefficient of the whole downlink receiving channel through the noise reduction processing of the downlink low-noise amplification device so as to compensate the value of signal transmission loss of the downlink signal increased along the PCB wiring to be 2 dB.
The mobile terminal for controlling the receiving sensitivity of the TDD system is characterized in that the power amplifying device is a radio frequency gain amplifier or a radio frequency power amplifier.
The base station is connected with the mobile terminal through a network for communication, and controls and conducts the uplink and downlink signals of the base station to different communication channels for transmission according to the time slot state of the time division duplex system.
Compared with the prior art, the mobile terminal for controlling the receiving sensitivity of the TDD system and the time division duplex system have the advantages that:
1. a1-level downlink low-noise amplification device is added on a receiving path between the power amplification device and the transceiver device to compensate transmission loss caused by the downlink signal in the receiving path in PCB wiring, so that the noise coefficient of the receiving path of the whole time division duplex system is reduced, the sensitivity of the TDD system is improved, and the user experience is improved.
2. The added downlink low-noise amplification device has the characteristics of low cost, excellent performance, high reliability and noise reduction and amplification effects.
3. The scheme designed by the invention has the advantages of simple structure, optimal link difference loss, realization of the shortest design path on the design of reducing the noise coefficient, low design cost and easier popularization.
Drawings
Fig. 1 is a block diagram of a mobile terminal for controlling a reception sensitivity of a TDD system according to the present invention.
Fig. 2 is a functional block diagram of a time division duplex system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
Referring to fig. 1, fig. 1 is a block diagram of a mobile terminal for controlling a receiving sensitivity of a TDD system according to the present invention. As shown in fig. 1, the mobile terminal 10 for controlling the receiving sensitivity of the TDD system includes a mobile terminal body, a PCB is disposed in the mobile terminal body, a transceiver 1, a downlink low-noise amplifier 2, a power amplifier 3, and a filter 4 are disposed on the PCB, and the transceiver 1, the downlink low-noise amplifier 2, the power amplifier 3, and the filter 4 are sequentially connected in series.
As shown in fig. 1, a second rf bidirectional switch (301) is built in the power amplifier 3, and the second rf bidirectional switch (301) enables the power amplifier 3 to independently complete the receiving and transmitting timeslot control operation of the TDD system. That is, the mobile terminal provided by the invention adopts the time division duplex working mode, and distinguishes the uplink or the downlink through the time slot state.
Specifically, the second radio frequency bidirectional switch (301) includes a common terminal (RFC), a first switch (RF1), and a second switch (RF2), the common terminal (RFC) is connected to the filter 4, the first switch (RF1) is connected to an input terminal of the downstream low noise amplifier 2, an output terminal of the downstream low noise amplifier 2 is connected to a receiving terminal (RX) of the transceiver 1, and the second switch (RF2) is connected to a transmitting Terminal (TX) of the transceiver. As shown in fig. 1, only one downlink low noise amplifier 2 is added to the receiving path (i.e., downlink) between the transceiver 1 and the power amplifier 3, and the downlink low noise amplifier 2 is connected in series to the transceiver 1 and the power amplifier 3.
Preferably, the power amplifying device 3 is a radio frequency gain amplifier or a radio frequency power amplifier.
Preferably, the downstream low-noise amplifier 2 is a 1-stage low-noise amplifier, and the noise factor thereof is 0.8 dB.
According to the noise system level connection formula and the ultimate sensitivity calculation formula, it is known that the noise figure (i.e. the insertion loss) of the entire tdd system is determined by the loss of the front receiving path of the power amplifier 3, and the insertion loss of the power amplifier 3 and the loss of the rear receiving path, such as the insertion loss of a filter, which is the ratio of the front power to the rear power of the inserted circuit, are ignored. In the embodiment of the present invention, the filter can be regarded as a passive network, and the insertion loss of the filter is the noise coefficient of the filter.
In the embodiment of the present invention, the reason that the downlink low-noise amplification apparatus 2 only employs a 1-stage low-noise amplifier is as follows:
the Noise figure (Noise figure, NF) cascade equation is:
NF0=NF1 + (NF2-1)/G1 + (NF3-1)/G1G2 + … (NFn-1)/G1*…Gn-1 （1）
i.e. noise figure NF = input signal-to-noise ratio/output signal-to-noise ratio of each stage of the low noise amplifying device, wherein NF0The total noise of a receiving path of the TDD system is shown, n represents the nth stage noise, G represents the gain of the power amplifier, and the level gain of each stage is shown by Gn.
It can be known from (1) that the NF (noise figure) of the first stage plays a critical role in the whole system, and when the downlink low-noise amplifier 2 works with multiple amplifier tubes, the cascade noise depends on the noise and gain of the first stage, because the influence after the third stage is already small, and the total noise is the sum of the noise of the first stage plus the noise of the second stage minus one divided by the gain of the first stage, therefore, the downlink low-noise amplifier added to the path of the RX end of the transceiver 1 is the first stage, and because the downlink low-noise amplifier has a smaller NF (noise figure), the NF (noise figure) of the whole system can be effectively reduced, and the loss (transmission loss) increased due to the longer PCB trace at the rear end can be compensated, so that the sensitivity level of the mobile terminal on the TDD receiving path can be effectively improved, and the value thereof is 2 dB.
Further, as shown in fig. 1, an antenna 6 and a first rf antenna switch 5 connected to the antenna 6 are further disposed on the PCB, and the first rf antenna switch 5 is connected to the filter 4 in series.
The mobile terminal further includes a baseband 7, the baseband 7 performs signal transmission with the transceiver 1, a baseband signal of the baseband 7 is used to distinguish an uplink from a downlink, and when the uplink is used, an uplink signal is transmitted, and when the downlink is used, a downlink signal is received.
The working principle is as follows: the baseband signal controls the common terminal (RFC) of the second radio frequency bidirectional switch (301) to be switched and connected to the first switch (RF1) or the second switch (RF2) according to the time slot state of the time division duplex system to form different communication paths.
Specifically, 1) when the time division duplex system is in a receiving time slot state, the baseband 7 signal controls the common terminal (RFC) of the second radio frequency bidirectional switch (301) to be switched and connected to the first switch (RF1) to form a downstream receiving path. That is, as shown in fig. 1, when the downlink receiving path is turned on, the downlink signal received by the antenna 6 is sequentially subjected to the selection of the first rf antenna switch 5, the filtering and optimization processing by the filter 4, then input to the power amplifying device 3 for amplification, and then output to the downlink low-noise amplifying device 2 for noise reduction optimization processing, and output to the transceiver 1 after compensating for a certain transmission loss of the downlink signal, thereby enhancing the sensitivity of the baseband 7 for receiving the downlink signal. Through the noise reduction treatment of the downlink low-noise amplification device 2, the noise coefficient of the whole downlink receiving channel is reduced so as to compensate the signal transmission loss increased by the overlong routing of the downlink signal on the PCB
2) When the time division duplex system is in a transmitting time slot state, a baseband 7 signal controls a common terminal (RFC) of the second radio frequency bidirectional switch (301) to be switched and connected to the second switch (RF2) to form an uplink transmitting path. That is, when the uplink receiving path is turned on, the baseband transmits an uplink signal to the transceiver 1, and the uplink signal is output through an output end (TX) of the transceiver 1, sequentially subjected to amplification processing by the power amplification device 3, filtering and optimization processing by the filter 4, selected by the first rf antenna switch 5, and transmitted through the antenna 6.
Therefore, the invention utilizes the working mode of TDD time division duplex, adds the 1-level downlink low-noise amplifying device in the receiving time slot, and utilizes the functions of noise reduction and amplification to effectively reduce NF (noise factor) of the receiving system, compensate transmission loss caused by overlong routing on a PCB (printed circuit board), improve the sensitivity level of the mobile terminal and further improve the experience of a user in the application of the mobile terminal such as a mobile phone in a remote area.
Example two
The invention also provides a time division duplex system, as shown in fig. 2, the system includes the mobile terminal 10 for controlling the receiving sensitivity of the TDD system and the base station 20 connected to the mobile terminal 10 through an antenna, the base station 20 communicates with the mobile terminal 10 through a network mode, and the network mode includes a bluetooth connection, a wireless network connection or other connection modes capable of performing network connection communication. The signals of the base station 20 are controlled to conduct different communication paths for transmission according to the time slot state (i.e. the receiving time slot state or the transmitting time slot state) of the time division duplex system, specifically according to the operation principle of the mobile terminal 10 described above.
In summary, the present invention discloses a mobile terminal and a time division duplex system for controlling the receiving sensitivity of a TDD system, wherein the mobile terminal method includes: including the mobile terminal body, be provided with the PCB board in the mobile terminal body be provided with transceiver, down low noise amplifier, power amplifier and wave filter on the PCB board, power amplifier includes second radio frequency bidirectional switch (301), second radio frequency bidirectional switch (301) includes common terminal (RFC), first switch (RF1) and second switch (RF2), common terminal (RFC) with the wave filter is connected, first switch (RF1) is connected with the input of down low noise amplifier, the output of down low noise amplifier with transceiver's receiving terminal (RX) is connected, second switch (RF2) with transceiver's transmitting Terminal (TX), baseband signal according to the time slot state control of time division duplex system the common terminal (RFC) switching of second radio frequency bidirectional switch (301) is connected to first switch (RF1) or second switch (2) in order to form different RF1) A communication path. According to the invention, the 1-level downlink low-noise amplification device is added on the receiving path between the power amplification device and the transceiver device to compensate the transmission loss caused by the downlink signal in the receiving path in PCB wiring, so that the noise coefficient of the receiving path of the whole time division duplex system is reduced, the sensitivity of the TDD system is improved, and the user experience is improved.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (5)
1. A mobile terminal for controlling the receiving sensitivity of a TDD system, comprising a mobile terminal body, wherein a PCB is disposed in the mobile terminal body, a transceiver, a downlink low noise amplifier, a power amplifier and a filter are disposed on the PCB, the power amplifier comprises a second RF bidirectional switch (301), the second RF bidirectional switch (301) comprises a common terminal (RFC), a first switch (RF1) and a second switch (RF2), the common terminal (RFC) is connected with the filter, the first switch (RF1) is connected with the input terminal of the downlink low noise amplifier, the output terminal of the downlink low noise amplifier is connected with the receiving terminal (RX) of the transceiver, the second switch (RF2) is connected with the transmitting Terminal (TX) of the transceiver, a baseband signal controls the common terminal (RFC) of the second RF bidirectional switch (301) according to the time slot status of a TDD system ) Switching connection to a first switch (RF1) or a second switch (RF2) to form different communication paths, the mobile terminal adopting a time division duplex mode of operation, differentiating between uplink and downlink by timeslot status;
the PCB is also provided with an antenna and a first radio frequency antenna switch connected with the antenna, and the first radio frequency antenna switch is connected with the filter in series;
when the time division duplex system is in a receiving time slot state, a baseband signal controls a common terminal (RFC) of the second radio frequency bidirectional switch (301) to be switched and connected to the first switch (RF1) to form a downlink receiving path;
when a downlink receiving channel is conducted, a downlink signal received by the antenna is sequentially subjected to selection of the first radio frequency antenna switch, filtering and optimization processing by the filter, then input to the power amplification device for amplification processing, and then output to the downlink low-noise amplification device for noise reduction optimization processing, and the downlink signal is output to the transceiver device after certain transmission loss of the downlink signal is compensated, so that the sensitivity of a baseband for receiving the downlink signal is enhanced;
the downlink low-noise amplification device is a 1-level low-noise amplifier, and the noise coefficient is 0.8 dB;
the total noise of the TDD system receiving path is the sum of the noise of the first-stage low-noise amplifying device and the noise of the second-stage low-noise amplifying device, which is subtracted by one and divided by the gain of the first-stage low-noise amplifying device;
and reducing the noise coefficient of the whole downlink receiving channel through the noise reduction treatment of the downlink low-noise amplification device so as to compensate the value of signal transmission loss of the downlink signal increased along the PCB routing.
2. The mobile terminal for controlling the reception sensitivity of a TDD system according to claim 1, wherein when the time division duplex system is in a transmission timeslot state, a baseband signal controls a common terminal (RFC) of the second radio frequency bidirectional switch (301) to be switched and connected to the second switch (RF2) to form an uplink transmission path.
3. The mobile terminal for controlling the receive sensitivity of a TDD system according to claim 2, wherein when an uplink receive path is turned on, a baseband sends an uplink signal to the transceiver device, and the uplink signal is output through an output Terminal (TX) of the transceiver device, sequentially amplified by the power amplifier device, filtered by the filter, optimized, and then transmitted through the antenna by selecting the first rf antenna switch.
4. The mobile terminal for controlling the receive sensitivity of a TDD system according to claim 1, wherein the power amplifying means is a radio frequency gain amplifier or a radio frequency power amplifier.
5. A time division duplex system comprising the mobile terminal for controlling the receiving sensitivity of the TDD system as claimed in any one of claims 1 to 4 and a base station, wherein the base station communicates with the mobile terminal through a network connection and controls the conduction of different communication paths for transmitting a base station signal according to the time slot state of the TDD system.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811129276.4A CN109150229B (en) | 2018-09-27 | 2018-09-27 | Mobile terminal and time division duplex system for controlling receiving sensitivity of TDD system |
| PCT/CN2019/107663 WO2020063612A1 (en) | 2018-09-27 | 2019-09-25 | Mobile terminal and time division duplex system for controlling receiving sensitivity of tdd system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811129276.4A CN109150229B (en) | 2018-09-27 | 2018-09-27 | Mobile terminal and time division duplex system for controlling receiving sensitivity of TDD system |
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| Publication Number | Publication Date |
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| CN109150229A CN109150229A (en) | 2019-01-04 |
| CN109150229B true CN109150229B (en) | 2021-07-13 |
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| CN201811129276.4A Active CN109150229B (en) | 2018-09-27 | 2018-09-27 | Mobile terminal and time division duplex system for controlling receiving sensitivity of TDD system |
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| WO (1) | WO2020063612A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109150229B (en) * | 2018-09-27 | 2021-07-13 | 惠州Tcl移动通信有限公司 | Mobile terminal and time division duplex system for controlling receiving sensitivity of TDD system |
| CN110971266A (en) * | 2019-12-04 | 2020-04-07 | 惠州Tcl移动通信有限公司 | WIFI sensitivity enhancing device and electronic equipment |
| CN111465040B (en) * | 2020-04-21 | 2023-07-18 | 惠州Tcl移动通信有限公司 | Method for optimizing drive of time division duplex system |
| CN117615459B (en) * | 2024-01-22 | 2024-04-16 | 南京典格通信科技有限公司 | Dynamic TDD switch switching method based on 5G ad hoc network system |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002171194A (en) * | 2000-11-30 | 2002-06-14 | Matsushita Electric Ind Co Ltd | Radio equipment, base radio station equipped therewith, portable information terminal and radio communication system incorpolating them |
| CN1832372A (en) * | 2005-03-10 | 2006-09-13 | 胡军 | Two-way amplifier of portable phone system |
| CN200944592Y (en) * | 2006-08-28 | 2007-09-05 | 大唐移动通信设备有限公司 | Time division duplex RF front end |
| JP4624401B2 (en) * | 2007-12-17 | 2011-02-02 | シャープ株式会社 | High frequency circuit and receiver |
| CN101557247A (en) * | 2008-04-09 | 2009-10-14 | 北京邦讯技术有限公司 | TD-SCDMA repeater and method for processing uplink and downlink of signals |
| CN101262674A (en) * | 2008-04-25 | 2008-09-10 | 中兴通讯股份有限公司 | A circuit and method for improving RF interference of dual-mode terminal |
| CN204013415U (en) * | 2014-06-09 | 2014-12-10 | 中国移动通信集团公司 | A kind of tdd systems amplifier and repeater |
| CN108233981A (en) * | 2016-12-15 | 2018-06-29 | 海能达通信股份有限公司 | Radio frequency extension apparatus and tdd systems |
| CN206620115U (en) * | 2017-02-08 | 2017-11-07 | 惠州Tcl移动通信有限公司 | Mobile terminal and its control circuit for improving TDD segment sensitive degree |
| CN109150229B (en) * | 2018-09-27 | 2021-07-13 | 惠州Tcl移动通信有限公司 | Mobile terminal and time division duplex system for controlling receiving sensitivity of TDD system |
-
2018
- 2018-09-27 CN CN201811129276.4A patent/CN109150229B/en active Active
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- 2019-09-25 WO PCT/CN2019/107663 patent/WO2020063612A1/en active Application Filing
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| WO2020063612A1 (en) | 2020-04-02 |
| CN109150229A (en) | 2019-01-04 |
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