CN104579411A - Wireless receiving and transmitting circuit compatible with TDD and FDD - Google Patents
Wireless receiving and transmitting circuit compatible with TDD and FDD Download PDFInfo
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Abstract
The invention discloses a wireless receiving and transmitting circuit compatible with TDD and FDD. The wireless receiving and transmitting circuit comprises a transmitting sub-module, a receiving sub-module, a signal transmission module, a switch circuit and a filter circuit; the same transmitting sub-module and the same receiving sub-module are used when the wireless receiving and transmitting circuit works in a TDD mode or an FDD mode; the downlink signal of the FDD mode and the uplink signal and the downlink signal of the TDD mode are transmitted through the signal transmission module and a downlink filter of the filter circuit; the connecting state between the receiving sub-module and the signal transmission module, as well as between the receiving sub-module and an uplink filter, is changed through the switch circuit, so that the uplink of the FDD mode and the uplink of the TDD mode are switched, and the uplink and the downlink of the TDD mode are switched. The wireless receiving and transmitting circuit compatible with TDD and FDD, disclosed by the invention, is a transceiving circuit which is low in cost, small in size, low in power consumption, high in performance, and compatible with TDD and FDD; the compatibility of the two transceiving working modes is realized through a relatively simple structure.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to wireless receiving and the radiating circuit of compatible TDD and FDD.
Background technology
Along with the development of mobile communication technology, the third generation, the carrying out gradually of forth generation mobile communications network construction, demand for low cost, low-power consumption, high performance miniaturized communication equipment is more and more urgent, simultaneously, also communication equipment is proposed to the requirement of compatible multiple communication standard, be not only the multiple communication standard under compatibility belongs to fdd mode or tdd mode, also requirement can simultaneously compatible fdd mode and tdd mode, to reduce the construction cost of mobile communications network further.
For can the wireless transceiver circuit of compatible fdd mode and tdd mode, generally present present Research is based on two kinds of thinkings, one respectively uses a transceiver module to fdd mode and tdd mode, namely there are two receiver modules and two transmitter modules, this implementation circuit is complicated, cost is high, volume is large, can not meet the demand of the communication system day by day developed; Another kind of thinking shares a transmitting-receiving submodule to fdd mode and tdd mode, the switching between FDD and TDD is realized by the operating frequency changing tuned filter, which structure is comparatively simple, but tuned filter and net control design complexity thereof, cost is high.
Summary of the invention
Based on this, be necessary, for generally can wireless transceiver circuit complex structure, the problem that cost is high of compatible fdd mode and tdd mode, to provide wireless receiving and the radiating circuit of compatible TDD and FDD that a kind of structure is simple, cost is low.
The wireless receiving of a kind of compatible TDD and FDD and radiating circuit, comprise and launch submodule, reception submodule, signal transmission module, switching circuit and filter circuit, described transmitting submodule is connected with described filter circuit by described signal transmission module, described reception submodule is connected with described signal transmission module and described filter circuit respectively by described switching circuit, and described filter circuit common port connects exterior antenna;
Described signal transmission module be used for the downstream signal that described transmitting submodule sends to be transferred to described filter and TDD uplink signal transmissions that described filter is sent to described switching circuit, described switching circuit is for changing the connection status of described reception submodule and described signal transmission module and described reception submodule and described up filter circuit, described connection status comprises and connects and disconnect, described filter circuit comprises interconnective upstream filter and downstream filter, described upstream filter is used for conducting FDD upward signal, intercept described FDD downstream signal and TDD signal, described downstream filter is used for FDD downstream signal and described TDD signal described in conducting, and intercept described FDD upward signal,
When working in fdd mode, described switching circuit controls described reception submodule and is connected with described filter circuit, described switching circuit controls described reception submodule and described signal transmission module disconnects, when working in row mode on TDD, described switching circuit controls described reception submodule and is connected with described signal transmission module, described switching circuit controls described reception submodule and described upstream filter disconnects, when working in TDD downlink mode, described switching circuit controls described reception submodule and described signal transmission module and described downstream filter and disconnects.
All use same reception submodule and launch submodule under the wireless receiving of compatible TDD and FDD of the present invention and radiating circuit are operated in tdd mode or fdd mode, when working in fdd mode, switching circuit controls to receive submodule and is connected with filter circuit and receives submodule and signal transmission module disconnects, FDD upward signal is transferred to reception submodule from upstream filter by switching circuit, FDD downstream signal is transferred to downstream filter from transmitting submodule by signal transmission module, the uplink and downlink of FDD are carried out in time simultaneously, but being distributed in different frequency range filters is separated in uplink and downlink link, when working in row mode on TDD, switching circuit controls to receive submodule and is connected with signal transmission module and receives submodule and upstream filter disconnects, TDD upward signal is transferred to signal transmission module from downstream filter and is transferred to reception submodule by switching circuit again, when working in TDD downlink mode, switching circuit controls to receive submodule and signal transmission module and downstream filter and disconnects, TDD downstream signal is transferred to downstream filter from transmitting submodule by signal transmission module, the uplink and downlink of TDD use identical frequency, communicate with different time slots.The compatibility of mode of operation received and dispatched by the wireless receiving of compatible TDD and FDD of the present invention and radiating circuit to two kinds with simple constitution realization, be the transmission circuit of a kind of low cost, small size, low-power consumption, high performance compatible TDD and FDD.
Accompanying drawing explanation
Fig. 1 is the compatible wireless receiving of TDD and FDD of the present invention and the structural representation of radiating circuit first embodiment;
Fig. 2 is the compatible wireless receiving of TDD and FDD of the present invention and the structural representation of radiating circuit second embodiment;
Fig. 3 is the compatible wireless receiving of TDD and FDD of the present invention and the structural representation of one of them specific embodiment of radiating circuit;
Fig. 4 is the structural representation launching submodule in the wireless receiving of compatible TDD and FDD of the present invention and radiating circuit;
Fig. 5 is the structural representation receiving submodule in the wireless receiving of compatible TDD and FDD of the present invention and radiating circuit.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below with reference to the accompanying drawings and embodiment, the present invention is further elaborated.Should be appreciated that concrete enforcement described herein is only in order to explain the present invention, does not limit the present invention.
As shown in Figure 1, the wireless receiving of a kind of compatible TDD and FDD and radiating circuit, comprise and launch submodule 100, reception submodule 200, signal transmission module 300, switching circuit 400 and filter circuit 500, described transmitting submodule 100 is connected with described filter circuit 500 by described signal transmission module 300, described reception submodule 200 is connected with described signal transmission module 300 and described filter circuit 500 respectively by described switching circuit 400, and described filter circuit 500 common port connects exterior antenna;
Described signal transmission module 300 be transferred to described filter for the downstream signal sent by described transmitting submodule 100 and TDD uplink signal transmissions that described filter is sent to described switching circuit 400, described switching circuit 400 is for changing the connection status of described reception submodule 200 and described signal transmission module 300 and described reception submodule 200 and described up filter circuit 500, described connection status comprises and connects and disconnect, described filter circuit 500 comprises interconnective upstream filter 520 and downstream filter 540, described upstream filter 520 is for conducting FDD upward signal, intercept described FDD downstream signal and TDD signal, described downstream filter 540 is for FDD downstream signal described in conducting and described TDD signal, and intercept described FDD upward signal,
When working in fdd mode, described switching circuit 400 controls described reception submodule 200 and is connected with described filter circuit 500, described switching circuit 400 controls described reception submodule 200 and disconnects with described signal transmission module 300, when working in row mode on TDD, described switching circuit 400 controls described reception submodule 200 and is connected with described signal transmission module 300, described switching circuit 400 controls described reception submodule 200 and disconnects with described upstream filter 520, when working in TDD downlink mode, described switching circuit 400 controls described reception submodule 200 and disconnects with described signal transmission module 300 and described downstream filter 540.
All use same reception submodule and launch submodule under the wireless receiving of compatible TDD and FDD of the present invention and radiating circuit are operated in tdd mode or fdd mode, when working in fdd mode, switching circuit controls to receive submodule and is connected with filter circuit and receives submodule and signal transmission module disconnects, FDD upward signal is transferred to reception submodule from upstream filter by switching circuit, FDD downstream signal is transferred to downstream filter from transmitting submodule by signal transmission module, the uplink and downlink of FDD are carried out in time simultaneously, but being distributed in different frequency range filters is separated in uplink and downlink link, when working in row mode on TDD, switching circuit controls to receive submodule and is connected with signal transmission module and receives submodule and upstream filter disconnects, TDD upward signal is transferred to signal transmission module from downstream filter and is transferred to reception submodule by switching circuit again, when working with TDD downlink mode, switching circuit controls to receive submodule and signal transmission module and downstream filter and disconnects, TDD downstream signal is transferred to downstream filter from transmitting submodule by signal transmission module, the uplink and downlink of TDD use identical frequency, communicate with different time slots.The compatibility of mode of operation received and dispatched by the wireless receiving of compatible TDD and FDD of the present invention and radiating circuit to two kinds with simple constitution realization, be the transmission circuit of a kind of low cost, small size, low-power consumption, high performance compatible TDD and FDD.
Wherein in an embodiment, wireless receiving and the radiating circuit of described compatible TDD and FDD also comprise control module, described control module is connected with described switching circuit, and described control module is for receiving operational order and controlling the closed of described switching circuit breaker in middle according to described operational order and disconnect.
Control module can control switch circuit breaker in middle closed with disconnect, thus can the operational order control switch circuit of more accurately and timely operation response person, with the mode of operation under different mode signal of the wireless receiving and radiating circuit that switch described compatible TDD and FDD in time.
As shown in Figure 2, wherein in an embodiment, described switching circuit 400 comprises the first radio frequency single-pole double-throw switch (SPDT) 420 and the second radio frequency single-pole double-throw switch (SPDT) 440, the common port of described first radio frequency single-pole double-throw switch (SPDT) 420 is connected with described reception submodule 200, the first end of described first radio frequency single-pole double-throw switch (SPDT) 420 is connected with described filter circuit 500, second end of described first radio frequency single-pole double-throw switch (SPDT) 420 is connected with the common port of described second radio frequency single-pole double-throw switch (SPDT) 440, the first end of described second radio frequency single-pole double-throw switch (SPDT) 440 puts sky, second end of described second radio frequency single-pole double-throw switch (SPDT) 440 is connected with described signal transmission module 300.
Wherein in an embodiment, described filter circuit is duplexer, and the first end of described duplexer is connected with described signal transmission module, and the second end of described duplexer is connected with described switching circuit, and the common port of described duplexer connects exterior antenna.
Duplexer effect is by isolated for transmitting and receiving signal, ensures to receive and launch and can normally work simultaneously. it is made up of the stop-band filter of two groups of different frequencies, avoids the machine to transmit and is transferred to receiver.
Wherein in an embodiment, described signal transmission module is circulator, and the first end of described circulator connects described transmitting submodule, and the second end of described circulator connects described filter circuit, and the common port of described circulator connects described switching circuit.
Circulator is the incident wave by entering its arbitrary port, imports the multiport device of next port according to the direction order determined by quiet bias field into.
A specific embodiment is explained in detail the compatible wireless receiving of TDD and FDD of the present invention and the course of work of radiating circuit and principle thereof below, for the ease of explanation description selection TD-SCDMAF frequency range as TDD signal, choose DSC1800 as FDD signal.
As shown in Figure 3, in this specific embodiment, the first radio-frequency (RF) switch 420 is between reception submodule 200 and duplexer 500, be connected with the uplink port of duplexer 500, its working frequency range comprises 1880MHz ~ 1920MHz and 1710MHz ~ 1785MHz, second radio-frequency (RF) switch 440 is between the first radio-frequency (RF) switch 420 and circulator 300, be connected with the b port of circulator 300, its working frequency range comprises 1880MHz ~ 1920MHz.When circuit working is in DCS1800, the state of the first radio-frequency (RF) switch 420 is that a with b is communicated with, and the state of the second radio-frequency (RF) switch 440 is that a with b is communicated with; When circuit working is when TD-SCDMA is up, the state of the first radio-frequency (RF) switch 420 is that a with c is communicated with, the state of the second radio-frequency (RF) switch 440 is that a with c is communicated with, when circuit working is when TD-SCDMA is descending, the state of the first radio-frequency (RF) switch 420 is that a with c is communicated with, and the state of the second radio-frequency (RF) switch 440 is that a with b is communicated with.
Circulator 300 is three port devices, transmitting submodule 100 described in its input port a connects, the downstream end a that output port c connects duplexer 500 is connected, and isolation end b is connected with the second radio-frequency (RF) switch 440, and its working frequency range comprises 1805MHz ~ 1880MHz and 1880MHz ~ 1920MHz.When circuit working is when DCS1800 and TD-SCDMA is descending, signal holds c to hold from a of circulator 300, when signal work in TD-SCDMA up time, signal holds b to hold from the c of circulator 300, work in DCS1800 up time without circulator.
Duplexer 500 in this specific embodiment is made up of upstream filter and downstream filter, the common port c of two filters connects antenna, the other end b of upstream filter is connected with the first radio-frequency (RF) switch 420, the other end a of downstream filter is connected with the output c of circulator 300, between connection a and c is downstream filter, its passband is TD-SCDMA F-band and DCS1800 band downlink, that is: 1805MHz ~ 1920MHz, good suppression is had to DCS1800 uplink band 1710MHz ~ 1785MHz, between connection b and c is upstream filter, its passband is DCS1800 uplink band 1710MHz ~ 1785MHz, good suppression to be had to other frequency band signals, especially higher suppression is had to 1805MHz ~ 1920MHz.When circuit working is when TD-SCDMA is up, signal is c to a through the path of duplexer, and when circuit working is when TD-SCDMA is descending, signal is a to c through the path of duplexer; When circuit working is when DCS1800 is up, signal is c to b through the path of duplexer, and when circuit working is when DCS1800 is descending, signal is a to c through the path of duplexer.
Antenna in the present embodiment is connected with the antenna end c of duplexer 500, and its working frequency range comprises up-downgoing frequency range 1710MHz ~ 1785MHz and the 1805MHz ~ 1880MHz of DCS1800, and the working frequency range 1880MHz ~ 1920MHz of TD-SCDMA.
When circuit working is when DCS1800 is up, the phase-locked loop receiving submodule exports the local oscillation signal of 1747.5MHz to frequency mixer, namely zero intermediate frequency is adopted, DCS1800 is up, and the propagation path of signal is that the antenna end c of antenna → duplexer → duplexer upstream ends b → the first radio-frequency (RF) switch b holds the → the first radio-frequency (RF) switch a to hold → receive submodule; When circuit working is when DCS1800 is descending, the phase-locked loop launching submodule exports the local oscillation signal of 1842.5MHz to frequency mixer, namely zero intermediate frequency is adopted, DCS1800 is descending, and the propagation path of signal is the antenna end c → antenna launching submodule 100 → circulator input a → circulator output c → duplexer downstream end a → duplexer.When circuit working is when TD-SCDMA is up, the phase-locked loop receiving submodule and transmitting submodule exports the local oscillation signal of any one frequency (as 1880.8MHz) in China Mobile's planning frequency to frequency mixer and modulator, namely adopts zero intermediate frequency.During TD-SCDMA, the propagation path of signal is that the antenna end c of antenna → duplexer → duplexer downstream end a → circulator output c → circulator isolation end b → the second radio-frequency (RF) switch c holds the → the second radio-frequency (RF) switch a end → the first radio-frequency (RF) switch c to hold the → the first radio-frequency (RF) switch a to hold → receive submodule 200; When circuit working is when TD-SCDMA is descending, the propagation path of signal is the antenna end c → antenna launching submodule 100 → circulator input a → circulator output c → duplexer downstream end a → duplexer.
Wherein in an embodiment, described transmitting submodule comprises interconnective digital signal processing module and the first integrated circuit, and described first integrated circuit is used for baseband digital signal to be converted into analog radio-frequency signal.
First integrated circuit is integrated with multiple circuit element, for baseband digital signal is converted into analog radio-frequency signal, simplifies and launches the structure of submodule, thus make the wireless receiving of compatible TDD and FDD of described the present invention and radiating circuit structure more simply, optimize.
Wherein in an embodiment, described reception submodule comprises interconnective digital signal processing module and the second integrated circuit, and described second integrated circuit is used for analog radio-frequency signal to be converted into baseband digital signal.
Second integrated circuit is integrated with multiple circuit element, for analog radio-frequency signal is converted into baseband digital signal, simplifies and receives the structure of submodule, thus make the wireless receiving of compatible TDD and FDD of described the present invention and radiating circuit structure more simply, optimize.
As shown in Figure 4, wherein in an embodiment, described transmitting submodule 100 comprises digital signal processing module 110, digital to analog converter 120, low pass filter 130, variable gain amplifier tube 140, modulator 150, phase-locked loop 160 and multiple power amplifier 170, described digital signal processing module 110, described digital to analog converter 120, described low pass filter 130, described variable gain amplifier tube 140, described modulator 150 are connected successively with described multiple power amplifier 170, and described phase-locked loop 160 is connected with described modulator 150.
In the present embodiment, the working frequency range of described transmitting submodule comprises TDD frequency range and FDD band downlink, described phase-locked loop produces local oscillation signal needed for TDD to described modulator to ensure that transmitter module output signal frequency is in TDD frequency range when tdd mode, the descending required local oscillation signal of FDD is produced to described modulator to ensure that transmitter module output signal frequency is at FDD band downlink when fdd mode, described phase-locked loop can also receive control command, and exports the local oscillation signal of different frequency according to the control command received.
As shown in Figure 5, wherein in an embodiment, described reception submodule 200 comprises digital signal processing module 210, A-D converter 220, low pass filter 230, variable gain amplifier tube 240, frequency mixer 250, phase-locked loop 260 and multiple low noise amplifier 270, described digital signal processing module 210, described A-D converter 220, described low pass filter 230, described variable gain amplifier tube 240, described frequency mixer 250 are connected successively with described multiple low noise amplifier 270, and described phase-locked loop 260 is connected with described frequency mixer 250.
In the present embodiment, described reception submodule can be operated in TDD frequency range and FDD uplink band, described phase-locked loop produces local oscillation signal needed for TDD to described modulator to ensure that transmitter module output signal frequency is in TDD frequency range when tdd mode, the up required local oscillation signal of FDD is produced to described modulator to ensure that transmitter module output signal frequency is at FDD uplink band when fdd mode, described phase-locked loop can also receive control command, and exports the local oscillation signal of different frequency according to the control command received.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (9)
1. the wireless receiving of compatible TDD and FDD and radiating circuit, it is characterized in that, comprise and launch submodule, reception submodule, signal transmission module, switching circuit and filter circuit, described transmitting submodule is connected with described filter circuit by described signal transmission module, described reception submodule is connected with described signal transmission module and described filter circuit respectively by described switching circuit, and described filter circuit common port connects exterior antenna;
Described signal transmission module be used for the downstream signal that described transmitting submodule sends to be transferred to described filter and TDD uplink signal transmissions that described filter is sent to described switching circuit, described switching circuit is for changing the connection status of described reception submodule and described signal transmission module and described reception submodule and described up filter circuit, described connection status comprises and connects and disconnect, described filter circuit comprises interconnective upstream filter and downstream filter, described upstream filter is used for conducting FDD upward signal, intercept FDD downstream signal and TDD signal, described downstream filter is used for FDD downstream signal and described TDD signal described in conducting, and intercept described FDD upward signal,
When working in fdd mode, described switching circuit controls described reception submodule and is connected with described filter circuit, described switching circuit controls described reception submodule and described signal transmission module disconnects, when working in row mode on TDD, described switching circuit controls described reception submodule and is connected with described signal transmission module, described switching circuit controls described reception submodule and described upstream filter disconnects, when working in TDD downlink mode, described switching circuit controls described reception submodule and described signal transmission module and described downstream filter and disconnects.
2. the wireless receiving of compatible TDD and FDD according to claim 1 and radiating circuit, it is characterized in that, also comprise control module, described control module is connected with described switching circuit, and described control module is for receiving operational order and controlling the closed of described switching circuit breaker in middle according to described operational order and disconnect.
3. the wireless receiving of compatible TDD and FDD according to claim 1 and 2 and radiating circuit, it is characterized in that, described switching circuit comprises the first radio frequency single-pole double-throw switch (SPDT) and the second radio frequency single-pole double-throw switch (SPDT), the common port of described first radio frequency single-pole double-throw switch (SPDT) is connected with described reception submodule, the first end of described first radio frequency single-pole double-throw switch (SPDT) is connected with described filter circuit, second end of described first radio frequency single-pole double-throw switch (SPDT) is connected with the common port of described second radio frequency single-pole double-throw switch (SPDT), the first end of described second radio frequency single-pole double-throw switch (SPDT) puts sky, second end of described second radio frequency single-pole double-throw switch (SPDT) is connected with described signal transmission module.
4. the wireless receiving of compatible TDD and FDD according to claim 1 and 2 and radiating circuit, it is characterized in that, described filter circuit is duplexer, the first end of described duplexer is connected with described signal transmission module, second end of described duplexer is connected with described switching circuit, and the common port of described duplexer connects exterior antenna.
5. the wireless receiving of compatible TDD and FDD according to claim 1 and 2 and radiating circuit, it is characterized in that, described signal transmission module is circulator, the first end of described circulator connects described transmitting submodule, second end of described circulator connects described filter circuit, and the common port of described circulator connects described switching circuit.
6. the wireless receiving of compatible TDD and FDD according to claim 1 and radiating circuit, it is characterized in that, described transmitting submodule comprises interconnective digital signal processing module and the first integrated circuit, and described first integrated circuit is used for baseband digital signal to be converted into analog radio-frequency signal.
7. the wireless receiving of compatible TDD and FDD according to claim 1 and 2 and radiating circuit, it is characterized in that, described reception submodule comprises interconnective digital signal processing module and the second integrated circuit, and described second integrated circuit is used for analog radio-frequency signal to be converted into baseband digital signal.
8. the wireless receiving of compatible TDD and FDD according to claim 1 and 2 and radiating circuit, it is characterized in that, described transmitting submodule comprises digital signal processing module, digital to analog converter, low pass filter, variable gain amplifier tube, modulator, phase-locked loop and multiple power amplifier, described digital signal processing module, described digital to analog converter, described low pass filter, described variable gain amplifier tube, described modulator are connected successively with described multiple power amplifier, and described phase-locked loop is connected with described modulator.
9. the wireless receiving of compatible TDD and FDD according to claim 1 and 2 and radiating circuit, it is characterized in that, described reception submodule comprises digital signal processing module, A-D converter, low pass filter, variable gain amplifier tube, frequency mixer, phase-locked loop and multiple low noise amplifier, described digital signal processing module, described A-D converter, described low pass filter, described variable gain amplifier tube, described frequency mixer are connected successively with described multiple low noise amplifier, and described phase-locked loop is connected with described frequency mixer.
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| CN201310518487.8A CN104579411B (en) | 2013-10-28 | 2013-10-28 | Compatible TDD and FDD wireless receiving and radiating circuit |
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| CN201310518487.8A CN104579411B (en) | 2013-10-28 | 2013-10-28 | Compatible TDD and FDD wireless receiving and radiating circuit |
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| CN110417377A (en) * | 2019-08-31 | 2019-11-05 | 中国电子科技集团公司第四十研究所 | A kind of switch filtering module |
| CN111130745A (en) * | 2019-12-31 | 2020-05-08 | 湖南金翎箭信息技术有限公司 | Configurable data link terminal communication control device |
| CN111313928A (en) * | 2020-02-13 | 2020-06-19 | 广州全盛威信息技术有限公司 | Ultra-wideband transceiver architecture supporting multiple systems and corresponding wireless access control device |
| CN112511286A (en) * | 2020-10-19 | 2021-03-16 | 福州速职时代网络科技有限公司 | Frequency shift duplex conversion method and device |
| CN114978221A (en) * | 2021-02-26 | 2022-08-30 | 华为技术有限公司 | Full duplex communication system, method and device for sub-band |
| CN114978221B (en) * | 2021-02-26 | 2023-07-14 | 华为技术有限公司 | Sub-band full duplex communication system, method and device |
| CN114337767A (en) * | 2021-11-15 | 2022-04-12 | 海能达通信股份有限公司 | Transfer device, data transmission method and communication system |
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