CN100417036C - Message machine of receiving-transmitting time-division duplex wireless communication system - Google Patents
Message machine of receiving-transmitting time-division duplex wireless communication system Download PDFInfo
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- CN100417036C CN100417036C CNB2004100307393A CN200410030739A CN100417036C CN 100417036 C CN100417036 C CN 100417036C CN B2004100307393 A CNB2004100307393 A CN B2004100307393A CN 200410030739 A CN200410030739 A CN 200410030739A CN 100417036 C CN100417036 C CN 100417036C
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- 238000004891 communication Methods 0.000 title claims abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 21
- 238000012163 sequencing technique Methods 0.000 claims description 7
- 230000001174 ascending effect Effects 0.000 claims description 4
- 238000013461 design Methods 0.000 abstract description 9
- 230000010354 integration Effects 0.000 abstract description 2
- 230000002457 bidirectional effect Effects 0.000 abstract 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
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- 230000005540 biological transmission Effects 0.000 description 3
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- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
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Abstract
The present invention provides a transceiver of a time division duplex (TDD) wireless communication system, which comprises an antenna, a baseband processing unit, and a transmitting circuit and a receiving circuit which are connected with the antenna and the baseband processing unit, wherein the transmitting circuit and the receiving circuit are electrically connected with a bidirectional common radio frequency filter, a bidirectional frequency mixer and an adjustable attenuator device together by a changeover switch. The devices are shared by the transmitting circuit and the receiving circuit, thereby reducing cost and saving power consumption, which is favorable to the enhancement of the integration level of a circuit design.
Description
Technical field
The present invention relates to the time division duplex radio communication field, relate in particular to the TDD radio communication system transceiver.
Background technology
Time division duplex (TDD) wireless communication system, be to transmit and receive to use same frequency, just utilize the different time to distinguish base station signal and subscriber signal, that is to say, the working method of tdd communication systems, make receiver identical, but do not work simultaneously with the sender operating frequency.
Existing transceiver circuitry design, referring to Fig. 1 and Fig. 2, sender and receiver are shared antenna and baseband circuit, but transmission path between antenna and baseband circuit and RX path are two separate links, by switch 1 or two links of 1 ' gating, connect antenna and radiating circuit or receiving circuit.Among Fig. 1, receiving circuit all comprises a frequency mixer (2,20) that is connected with distributor (SPLITTER), the radio-frequency filter (3,30) that is connected with frequency mixer and intermediate-frequency filter (4,40) respectively with radiating circuit.Among Fig. 2, adopted digital intermediate frequency (DIF) technology, the if sampling signal is carried out directly exporting baseband I Q digital signal after the Digital Signal Processing.For the emission path, through after the number signal processing, adopt DUC (Digital Up Convert) after the reception baseband I Q digital signal, on DAC, directly export analog if signal.Similarly, receiving circuit all comprises a frequency mixer (2 ', 20 ') that is connected with distributor (SPLITTER), the radio-frequency filter (3 ', 30 ') that is connected with frequency mixer and intermediate-frequency filter (4 ', 40 ') respectively with radiating circuit.This shows, used two groups of electronic devices in the transmission circuit of available technology adopting, as frequency mixer, intermediate-frequency filter and radio-frequency filter with identical function.The electronic device of these identical functions has increased power and cost, has taken board area, is unfavorable for realizing the Highgrade integration of circuit design.
Also used the transceiver of the shared two-way intermediate-frequency filter of a kind of transmit signal path and received signal path in general Terminal Design, switching circuit is responsible for connecting this two-way intermediate-frequency filter to receiving circuit or radiating circuit.But in this transceiver only be shared to intermediate-frequency filter, its frequency mixer or other devices do not have shared.In fact, for intermediate frequency and radio-frequency filter, all be two-way generally, can be directly used in receiver and sender.In fact as seen from Figure 1, be the transmit-receive sharing filter in the middle of antenna and the radio-frequency (RF) switch, for tdd systems, the shared design of this filter is very general, just needs reasonably to arrange shared position.The frequency mixer that general terminal is used adopts active mixer substantially because requirement is lower, so can only adopt different frequency mixers for up-conversion or down-conversion.Therefore, frequency mixer is not shared in general terminal.And the variable gain amplifier of usefulness is adjusted in general terminal gain, and adjustable range is big, and index request is low, and particularly the linearity has directivity, can not be shared.The transceiver common parts, it must be two-way at first requiring device, and for frequency mixer and fader in the existing design, much is active, unidirectional.Therefore, these devices are not shared usually.
In addition, receiver and sender are operated in the communication system on the different frequency, as frequency division duplex system, frequency mixer on the radiating circuit or other devices frequency mixer or the operating frequency of other devices during in reception on the operating frequency in when emission and receiving circuit is different, can't realize the shared of these devices easily.
In addition, radio-frequency filter, frequency mixer, the price of adjustable attenuator all compares expensive, transmits and receives shared these devices of circuit if can make, and then can reduce cost, and saves power consumption, reduces the board area that these devices take.
Summary of the invention
The purpose of this invention is to provide a kind of TDD radio communication system transceiver, the radiating circuit of this transceiver and receiving circuit shared radio frequency filter, frequency mixer, the adjustable attenuator device, thereby reduce cost, save power consumption, reduce the board area that these devices take.
TDD radio communication system transceiver implementation of the present invention is:
A kind of TDD radio communication system transceiver, it comprises antenna, baseband processing unit and the radiating circuit and the receiving circuit that connect antenna and baseband processing unit, this radiating circuit and receiving circuit comprise the first shared diverter switch, and connect antenna by this first diverter switch, it is characterized in that this radiating circuit and receiving circuit also comprise two-way frequency mixer and one group of second diverter switch between first diverter switch and frequency mixer of common electrical connection;
This radiating circuit and receiving circuit are electrically connected the shared radio frequency filter jointly by second diverter switch, and this shared radio frequency filter is connected between this second diverter switch and the described frequency mixer;
This radiating circuit comprises the modulator that is connected with baseband processing unit or digital modulator, emission medium-frequency filter (211), emission medium-frequency amplifier (212), the 3rd diverter switch, frequency mixer, shared radio frequency filter, second diverter switch, emission variable gain amplifier (213), emission radio-frequency filter (214), emission low noise amplifier (215) and first diverter switch (003) that is linked in sequence, wherein, frequency mixer also connects local oscillator; This receiving circuit comprises first diverter switch that is linked in sequence, the demodulator or the digital demodulator that receive low noise amplifier, received RF filter, reception variable gain amplifier, second diverter switch, shared radio frequency filter, frequency mixer, the 3rd diverter switch, reception intermediate frequency amplifier, reception intermediate-frequency filter and connect baseband processing unit;
Described first diverter switch, second diverter switch, the 3rd diverter switch are respectively by first switch-over control signal and the control of second switch-over control signal, when transceiver is in accepting state, making first switch-over control signal by sequencing control is high level, second switch-over control signal is a low level, when transceiver is in emission state, making first switch-over control signal by sequencing control is low level, and second switch-over control signal is a high level.
Preferable, the on-air radio signal of described TDD radio communication system comprises ascending time slot, protection time slot and descending time slot, described second diverter switch inserts radiating circuit with shared radio frequency filter and frequency mixer when emission enables; When reception enables shared radio frequency filter and frequency mixer are inserted receiving circuit, this emission enables and receives switching time between enabling in this protection time slot.
Preferable, this frequency mixer directly connects local oscillator or this frequency mixer is connected with local oscillator by buffer amplifier.
Preferable, the common two-way adjustable attenuator that is electrically connected of this radiating circuit and receiving circuit, this adjustable attenuator connects this frequency mixer and the 3rd diverter switch.
Preferable, frequency link also can be connected on the radio frequency link during described adjustable attenuator can be connected.
Preferable, this radiating circuit and receiving circuit are by the common intermediate-frequency filter that is electrically connected of diverter switch, and this intermediate-frequency filter is connected between this frequency mixer and the 3rd diverter switch.
Preferable, this intermediate-frequency filter is connected between adjustable attenuator and the 3rd diverter switch, perhaps is connected between frequency mixer and the adjustable attenuator.
Description of drawings
Fig. 1 is existing wireless transceiver circuitry figure;
Fig. 2 is the existing transceiver circuitry figure that adopts digital if technology;
Fig. 3 is the radio receiving-transmitting unit first embodiment circuit diagram of the present invention;
Fig. 4 is the sequencing control schematic diagram of radio receiving-transmitting unit among Fig. 3;
Fig. 5 is the radio receiving-transmitting unit second embodiment circuit diagram of the present invention.
Embodiment
Implement and understand the present invention for the ease of persons skilled in the art, describe the present invention with reference to accompanying drawing by embodiment respectively below.
By the introduction of front, as can be seen, the effect that a lot of devices of receiver and sender are played in receiving-transmitting chain is identical, particularly in the TDD wireless communication system.Because when transmitting and receiving in the TDD system, the transceiver operating frequency is identical, radio-frequency filter in the radiating circuit in radio-frequency filter and intermediate-frequency filter and the receiving circuit and intermediate-frequency filter are identical.For frequency mixer, if adopt passive frequency mixer, it can be used as upconverter and low-converter uses.Because TDD is time-division work, has only the link of a direction in running order at synchronization, this just provides for the device on radiating circuit and the receiving circuit is shared may.Can time division multiplexing arrive receiving circuit and radiating circuit for identical passive device, just when receiving, this passive device is connected on the receiving circuit, and when emission, this passive device is connected on the radiating circuit.Therefore the present invention proposes the wireless transceiver circuitry of a kind of TDD of being used for, shared radio frequency filter and frequency converter in transmitting and receiving circuit, and adjustable attenuator.
Specifically in conjunction with Fig. 3, the transceiver in the first embodiment of the invention comprises an antenna 001, baseband processing unit 100 and the radiating circuit and the receiving circuit that connect antenna and baseband processing unit.Receiving circuit comprises first radio-frequency filter 002, first diverter switch 003 that are linked in sequence, the demodulator 115 that receives low noise amplifier (LNA) 110, received RF filter 111, reception variable gain amplifier 112, second diverter switch 004, shared radio frequency filter 010, frequency mixer 011, adjustable attenuator 012, the 3rd diverter switch 005, reception intermediate frequency amplifier 113, reception intermediate-frequency filter 114 and connect baseband processing unit 100.Wherein, by switch-over control signal SW1 and SW2 control, frequency mixer 011 also connects local oscillator 008 to switch 003,004,005 respectively.Be appreciated that this local oscillator 008 also can pass through buffer amplifier (not shown) and be connected with frequency mixer 011.
Switch 003,004,005 switches according to the sequencing control of base station or terminal.Fig. 4 is the control timing figure of base station.Explain in this control timing to the base station, the control timing of terminal and the control timing of base station are similar, and just time point is different: when the base station was in emission and enables, terminal was in to receive and enables; Receive when enabling when the base station is in, terminal is in emission and enables.No matter base station, or terminal, all conversion and control all are to realize in the protection time slot GT0 of system and GT1.
In Fig. 4, schematically shown the control timing of base station in the tdd communication systems.The on-air radio signal of tdd communication systems comprises most frames; wherein; each frame has two protection time slot GT0 and GT1; N descending time slot (slot 0 to slot N-1) and M ascending time slot (slot N to slot N+M-1) are arranged, and this protection time slot is between ascending time slot and descending time slot.At descending time slot, emission enables, the SW1 low level, and the SW2 high level, the C point connects the S2 point in the switch 003,004,005, and the base station circuit is connected.At protection time slot GT0, the base station transfers the reception enabled state to by the emission enabled state, and control signal SW1 is a high level, and SW2 is a low level, and the C point of three groups of switches 003,004,005 all connects the S1 point, and receiving circuit is connected.At protection time slot GT1, the base station transfers the emission enabled state again to by receiving enabled state, the SW1 low level, and the SW2 high level, the C point connects S2 point, conducting radiating circuit in the switch 003,004,005.
Get back to Fig. 3, when transceiver is in accepting state, make control signal SW1 go up level for high by sequencing control, SW2 is low, switch 003,004, and 005 C point and S1 point are communicated with.Its signal flow is to as follows: wireless signal is from antenna 001 input, through 002 filtering of first radio-frequency filter, through switch 003, C point and the S1 point of this moment 003 are communicated with, signal is input to and receives low noise amplifier 110, after signal amplifies, again through 111 filtering of received RF filter, after receiving variable gain amplifier 112 amplifications, signal is input to the C point of switch 004, this moment, the C point and the S1 point of switch 003 were communicated with, so signal is input to shared radio frequency filter 010, through frequency mixer 011, this moment is because signal is the radio frequency inlet input from frequency mixer, and after the local oscillation signal mixing of local oscillator (RF_LO) 008, the output intermediate-freuqncy signal, the frequency mixer 011 of this moment plays a low-converter.The intermediate-freuqncy signal of frequency mixer 011 output is further adjusted signal level through 012 adjustable attenuator, sends into switch 005, and 005 C point and the S1 point of this moment are communicated with, and intermediate-freuqncy signal is sent to reception intermediate frequency amplifier 113.After receiving intermediate-frequency filter 114 filtering, arrive demodulator 115.Intermediate-freuqncy signal is demodulated into I, Q baseband signal, sends into baseband processing unit 100, carry out follow-up Base-Band Processing.
The radiating circuit of transceiver of the present invention comprises the demodulator 210 that is connected with baseband processing unit 100 that is linked in sequence, emission medium-frequency filter 211, emission medium-frequency amplifier 212, the 3rd diverter switch 005, adjustable attenuator 012, frequency mixer 011, shared radio frequency filter 010, second diverter switch 004, emission variable gain amplifier 213, emission radio-frequency filter 214, emission low noise amplifier 215, first diverter switch 003 and first radio-frequency filter 002 are electrically connected with antenna 001.Wherein, frequency mixer 011 also connects local oscillator 008.
When transceiver was in emission state, this moment, control signal SW1 was a low level, and SW2 is a high level, switch 003,004, and 005 C point and S2 point are communicated with.The I of baseband processing unit 100 outputs, the Q baseband signal is by modulator 210, baseband signal is modulated to intermediate-freuqncy signal, after 211 filtering of emission medium-frequency filter and 212 amplifications of emission medium-frequency amplifier, be input to the S2 point of switch 005, this moment, the C point and the S2 point of switch 005 were communicated with, intermediate-freuqncy signal is sent into adjustable attenuator 012, carry out the power control first time, through frequency mixer 011, this moment is because signal is the intermediate frequency inlet input from frequency mixer 011, after the local oscillation signal mixing of local oscillator LO 008 output, the output radiofrequency signal, the frequency mixer 011 of this moment plays a upconverter.The radiofrequency signal of frequency mixer 011 output is through radio-frequency filter 010, send into switch 004, this moment, the C point and the S2 point of switch 004 were communicated with, radiofrequency signal enters emission RF variable gain amplifier 213, after the 214 further filtering of emission radio-frequency filter, output to switch 003 by emission low noise amplifier 215 power amplifiers, the C point and the S2 point of the switch 003 of this moment are communicated with, and radiofrequency signal is launched to antenna 001 by filter 002.
Radiating circuit in this receiver and receiving circuit pass through switching circuit shared radio frequency filter, frequency mixer, and adjustable attenuator, shared in order to realize, these devices all should be two-way.In addition, two-way frequency mixer plays a part different under the different operating state: when accepting state, as low-converter, realize the downward frequency spectrum shift of radiofrequency signal to intermediate-freuqncy signal; When emission state,, realize the upwards frequency spectrum shift of intermediate-freuqncy signal to radiofrequency signal as upconverter.
Transceiver of the present invention is shared relatively more expensive radio-frequency filter, frequency mixer and adjustable attenuator.Simultaneously, for local oscillator, just can directly connect frequency mixer without power divider.Adopt this design to reduce cost, save power consumption, help improving the integrated level of circuit design.
It is pointed out that shared adjustable attenuator can be arranged on middle frequency link, also can be arranged on the radio frequency link.Intermediate-frequency filter in radiating circuit and the receiving circuit can be realized shared as required.During shared intermediate-frequency filter, this intermediate-frequency filter is connected between two-way frequency mixer 011 and the diverter switch 005, perhaps is connected between adjustable attenuator 012 and the switch 005, perhaps is connected between two-way frequency mixer 011 and the adjustable attenuator 012.
Shown in Fig. 5 is second embodiment of the invention, is the transceiver circuitry schematic diagram of having used digital if technology in 1 converter technique.Adopt the radio receiving-transmitting unit of 2 converter techniques similar among the operation principle of this transceiver and first embodiment, still, demodulator 115 is become digital demodulator 115 ' for receiving circuit; For radiating circuit, modulator 210 is become digital modulator 210 '.Digital demodulator 115 ' is made up of high-speed ADC (analog-to-digital conversion device) and digital down converter.Digital demodulator 115 ' carries out digital demodulation to the intermediate-freuqncy signal of intermediate-frequency filter 114 outputs, directly exports digital signal and gives baseband processing unit 100.For transmission channel, digital modulator 210 ' is made up of digital up converter and high-speed DAC (digital-to-analogue converter).Digital modulator 210 ' directly receives digital signal I, the Q signal of baseband processing unit 100, carries out exporting analog if signal to intermediate-frequency filter 211 after the digital modulation.
The present invention is connected to shared radio-frequency filter, frequency mixer, adjustable attenuator on radiating circuit or the receiving circuit by diverter switch.Diverter switch is controlled by enable signal, when emission enables radio-frequency filter and frequency mixer is inserted radiating circuit; When reception enables, radio-frequency filter and frequency mixer are inserted receiving circuit.Be appreciated that adjustable attenuator also can be connected on radiating circuit and the receiving circuit, not shared.For the different gains requirement of compensate for transceiver, in fact added different variable gain amplifiers on the receiving-transmitting chain respectively.This shared adjustable attenuator is in order to further expand control range.
The present invention is primarily aimed at the base station and uses, and the base station is to adjustable attenuator, and the requirement of frequency mixer is all than higher.Adopt shared mixers, need propose special requirement, can only adopt passive frequency mixer, and can use as upconverter and low-converter to frequency mixer.Usually,, need confirm when shared frequency converter designs that the index of receiving circuit and radiating circuit is distributed, could guarantee correct shared mixers for the technical requirement difference of last low-converter.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (6)
1. TDD radio communication system transceiver, it comprises antenna (001), baseband processing unit (100) and the radiating circuit and the receiving circuit that connect antenna and baseband processing unit, this radiating circuit and receiving circuit comprise shared first diverter switch (003), and connect antenna by this first diverter switch, it is characterized in that this radiating circuit and receiving circuit also comprise two-way frequency mixer (011) and one group of second diverter switch (004) between first diverter switch and frequency mixer of common electrical connection;
This radiating circuit and receiving circuit are electrically connected shared radio frequency filter (010) jointly by second diverter switch, and this shared radio frequency filter is connected between this second diverter switch and the described frequency mixer;
This radiating circuit comprises the modulator that is connected with baseband processing unit or digital modulator, emission medium-frequency filter (211), emission medium-frequency amplifier (212), the 3rd diverter switch, frequency mixer, shared radio frequency filter, second diverter switch, emission variable gain amplifier (213), emission radio-frequency filter (214), emission low noise amplifier (215) and first diverter switch (003) that is linked in sequence, wherein, frequency mixer also connects local oscillator; This receiving circuit comprises first diverter switch that is linked in sequence, the demodulator or the digital demodulator that receive low noise amplifier, received RF filter, reception variable gain amplifier, second diverter switch, shared radio frequency filter, frequency mixer, the 3rd diverter switch, reception intermediate frequency amplifier, reception intermediate-frequency filter and connect baseband processing unit;
Described first diverter switch, second diverter switch, the 3rd diverter switch are respectively by first switch-over control signal and the control of second switch-over control signal, when transceiver is in accepting state, making first switch-over control signal by sequencing control is high level, second switch-over control signal is a low level, when transceiver is in emission state, making first switch-over control signal by sequencing control is low level, and second switch-over control signal is a high level.
2. transceiver as claimed in claim 1, it is characterized in that, the on-air radio signal of described TDD radio communication system comprises ascending time slot, protection time slot and descending time slot, and described second diverter switch inserts radiating circuit with shared radio frequency filter and frequency mixer when emission enables; When reception enables shared radio frequency filter and frequency mixer are inserted receiving circuit, this emission enables and receives switching time between enabling in this protection time slot.
3. transceiver as claimed in claim 1 is characterized in that, described frequency mixer directly connects local oscillator (008) or this frequency mixer is connected with local oscillator by buffer amplifier.
4. as claim 2 or 3 described transceivers, it is characterized in that, the common two-way adjustable attenuator (012) that is electrically connected of described radiating circuit and receiving circuit, this adjustable attenuator connects described frequency mixer and described the 3rd diverter switch.
5. transceiver as claimed in claim 4 is characterized in that, frequency link also can be connected on the radio frequency link during described adjustable attenuator can be connected.
6. transceiver as claimed in claim 5, it is characterized in that, the common intermediate-frequency filter that is electrically connected of described radiating circuit and receiving circuit, this intermediate-frequency filter is connected between described adjustable attenuator and described the 3rd diverter switch, perhaps is connected between described frequency mixer and the described adjustable attenuator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100307393A CN100417036C (en) | 2004-04-02 | 2004-04-02 | Message machine of receiving-transmitting time-division duplex wireless communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100307393A CN100417036C (en) | 2004-04-02 | 2004-04-02 | Message machine of receiving-transmitting time-division duplex wireless communication system |
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| CN1677882A CN1677882A (en) | 2005-10-05 |
| CN100417036C true CN100417036C (en) | 2008-09-03 |
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| CNB2004100307393A Expired - Lifetime CN100417036C (en) | 2004-04-02 | 2004-04-02 | Message machine of receiving-transmitting time-division duplex wireless communication system |
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| CN101355537B (en) * | 2007-07-24 | 2012-03-21 | 鼎桥通信技术有限公司 | Digital predistortion RF transmit-receive circuit suitable for TDD mode |
| JP5522733B2 (en) * | 2010-09-30 | 2014-06-18 | 株式会社ヨコオ | Baseband amplification unit and pulse radar device |
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| US9603139B2 (en) * | 2012-09-21 | 2017-03-21 | Lg Electronics Inc. | Method and device for transmitting and receiving downlink signal in wireless communication system |
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| CN105406883A (en) * | 2015-12-01 | 2016-03-16 | 上海宏力达信息技术有限公司 | Wireless communication device |
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| CN109347512A (en) * | 2018-11-30 | 2019-02-15 | 北京羽扇智信息科技有限公司 | The control method of signal transmitting apparatus, electronic equipment and signal transmitting apparatus |
| CN111817744A (en) * | 2020-07-17 | 2020-10-23 | 盐城工学院 | Distributed radio frequency electronic system and signal processing method |
| CN111988052B (en) * | 2020-07-30 | 2022-12-27 | 深圳市重投华讯太赫兹科技有限公司 | Receiving antenna circuit, transmitting antenna circuit and security check instrument |
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Also Published As
| Publication number | Publication date |
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| CN1677882A (en) | 2005-10-05 |
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