CN110300421A - Uplink and downlink detection of loss of mains circuit and communication equipment - Google Patents
Uplink and downlink detection of loss of mains circuit and communication equipment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H—ELECTRICITY
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Abstract
The present invention relates to a kind of uplink and downlink detection of loss of mains circuit and communication equipments.Circuit therein includes the TD standard signal that signal input unit is used to obtain signal source output, and is filtered and the output that decays to TD standard signal；The TD standard signal that converter unit is used to input a signal into unit output downconverts to low frequency；Unit is inhibited to be used to carry out AF panel to the TD standard signal after frequency conversion；Converting unit is used to the TD standard signal after AF panel being converted to digital signal；Signal detection unit is used to detect TD upstream switch signal and TD downing switch signal from digital signal；State detection unit is used to detect the level of TD upstream switch signal and TD downing switch signal and determines desynchronizing state.The synchronization decisions of switching signal are carried out based on circuit hardware, response speed and precision are higher, and stability is more preferable, have achieved the purpose that effectively improve uplink and downlink step-out judging efficiency.
Description
Technical field
The present invention relates to fields of communication technology, more particularly to a kind of uplink and downlink detection of loss of mains circuit and communication equipment.
Background technique
With the development of communication technology, fourth generation mobile communication technology popularization and application, the 5th third-generation mobile communication technology
It has emerged and has gradually promoted.Commercial 4G (forth generation mobile communication) is relatively broad to use LTE system.LTE system has two
Kind operating mode, one is FDD (Frequency Division Duplexing, frequency division duplex)-LTE, and another kind is TDD
(Time Division Duplexing, time division duplex)-LTE.Wherein, TDD-LTE mode be " common frequency, it is different when
Between ", sending and receiving is that uplink and downlink channel is distinguished using the different time-gap of same frequency, in time discontinuously.At one
Between section be sent to base station (i.e. UL, uplink) by mobile station, another period is sent to mobile station (i.e. DL, downlink) by base station.
Therefore between base station and mobile station, the requirement to time synchronization is more harsh.
In traditional TDD-LTE system, the judgement of uplink and downlink step-out, Huo Zhezhi are generally carried out to received signal by base station
It connects detection communication link and carries out the judgement of uplink and downlink step-out.However, inventor has found in above-mentioned tradition TDD- during realization
The uplink and downlink step-out judgment mode of LTE system has that uplink and downlink step-out judging efficiency is not high.
Summary of the invention
Based on this, it is necessary to for above-mentioned traditional TDD-LTE system uplink and downlink step-out judgment mode the problem of,
A kind of uplink and downlink detection of loss of mains circuit and a kind of communication equipment that can effectively improve uplink and downlink step-out judging efficiency is provided.
To achieve the goals above, the embodiment of the present invention the following technical schemes are provided:
On the one hand, the embodiment of the present invention provides a kind of uplink and downlink detection of loss of mains circuit, comprising:
Signal input unit, for obtain signal source output TD standard signal, and to TD standard signal be filtered with
Decaying output；
Converter unit, the output end of input terminal connection signal input unit, for inputting a signal into the TD system of unit output
Formula signal downconverts to low frequency；
Inhibit unit, input terminal connects the output end of converter unit, for interfering the TD standard signal after frequency conversion
Inhibit；
Converting unit, input terminal connection inhibit the output end of unit, for converting the TD standard signal after AF panel
For digital signal；
Signal detection unit, input terminal connect the output end of converting unit, open for detecting TD uplink from digital signal
OFF signal and TD downing switch signal；
State detection unit, the output end of input terminal connection signal detection unit, for detect TD upstream switch signal and
The level of TD downing switch signal simultaneously determines desynchronizing state.
In one of the embodiments, state detection unit include NAND gate, first with door, second with door and or non-
Door, the first output end of the first input end connection signal detection unit of NAND gate, the second input terminal connection signal of NAND gate
The second output terminal of detection unit, the output end of NAND gate be separately connected first with door and second with the first input end of door；
First connect the first input end of NAND gate with the second input terminal of door, and first is used for connection chain with the output end of door
The first switch signal end of road control switching circuit；
Second connect the second input terminal of NAND gate with the second input terminal of door, and second is used for connection chain with the output end of door
The second switch signal end of road control switching circuit；
The first input end connection first of nor gate and the output end of door, the second input terminal connection second of nor gate and door
Output end, the output end of nor gate is used for connection status prompt unit.
State detection unit further includes NOT gate in one of the embodiments, and the input terminal of NOT gate connects the defeated of nor gate
The output end of outlet, NOT gate is used for connection status prompt unit.
Signal detection unit includes fpga chip or CPLD device in one of the embodiments,.
Signal input unit includes high frequency filter and digital pad, high frequency filter in one of the embodiments,
Input terminal be used for connecting signal source, high frequency filter output end connection digital pad input terminal, digital pad
The input terminal of output end connection converter unit.
Converter unit includes frequency mixer, the first balun and local vibration source in one of the embodiments,；
The output end of the first input end connection digital pad of frequency mixer, the second input terminal of frequency mixer connect local vibration source
Output end, the first output end of frequency mixer connects the first differential port of the first balun, the second output terminal connection of frequency mixer
Second differential port of the first balun；
The single-end port connection of first balun inhibits the input terminal of unit.
Inhibiting unit in one of the embodiments, includes low-frequency filter, the input terminal connection first of low-frequency filter
The single-end port of balun, the input terminal of the output end connection converting unit of low-frequency filter.
Inhibiting unit in one of the embodiments, further includes low-frequency amplifier, and the output end of low-frequency filter passes through low
The input terminal of audio amplifier connection converting unit.
Converting unit includes the second balun and analog-digital converter in one of the embodiments,；
The single-end port connection of second balun inhibits the output end of unit, and the first differential port of the second balun connects modulus
Second differential port of converter first input end, the second balun connects the second input terminal of analog-digital converter；
The input terminal of the output end connection signal detection unit of analog-digital converter.
On the other hand, a kind of communication equipment is provided, including above-mentioned uplink and downlink detection of loss of mains circuit.
Above-mentioned communication equipment further includes condition prompting unit, the letter of condition prompting unit in one of the embodiments,
Number end connection uplink and downlink detection of loss of mains circuit in state detection unit output end；
When condition prompting unit is used to receive the step-out alarm signal of state detection unit output, step-out alarm is carried out.
Above-mentioned uplink and downlink detection of loss of mains circuit and communication equipment obtain the TD system that signal source generates by signal input unit
Formula signal and after adjusting power, the TD standard signal of low frequency is downconverted to by converter unit, then inhibited unit is to low frequency
TD standard signal carry out AF panel, reconvert unit by the TD standard signal after AF panel be converted to digital signal export
Give signal detection unit.Signal detection unit detects the TD upstream switch for including in the TD standard signal after being converted to digital signal
Signal and TD downing switch signal, and export to state detection unit.Finally by state detection unit detection TD upstream switch letter
Number and TD downing switch signal level, can be according to the level state of TD upstream switch signal and TD downing switch signal, directly
Connect determine two switching signal whether step-out.The synchronization decisions of switching signal, fast response time and essence are carried out based on circuit hardware
Du Genggao, and stability is more preferable, has achieved the purpose that greatly improve uplink and downlink step-out judging efficiency.
Detailed description of the invention
Fig. 1 is the first structure diagram of uplink and downlink detection of loss of mains circuit in one embodiment；
Fig. 2 is the structural schematic diagram of state detection unit in one embodiment；
Fig. 3 is the second structural schematic diagram of uplink and downlink detection of loss of mains circuit in one embodiment；
Fig. 4 is the third structural schematic diagram of uplink and downlink detection of loss of mains circuit in one embodiment；
Fig. 5 is the 4th structural schematic diagram of uplink and downlink detection of loss of mains circuit in one embodiment；
Fig. 6 is the 5th structural schematic diagram of uplink and downlink detection of loss of mains circuit in one embodiment；
Fig. 7 is in one embodiment using the electrical block diagram of the communication equipment of uplink and downlink detection of loss of mains circuit.
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, not
For limiting the application.
It should be noted that unless otherwise defined, all technical and scientific terms used herein and belong to this hair
The normally understood meaning of bright those skilled in the art is identical.Term as used herein in the specification of the present invention
It is intended merely to describe the purpose of specifically embodiment, it is not intended that in the limitation present invention.Term as used herein "and/or"
Including any and all combinations of one or more related listed items.
In TDD-LTE system, using the duplex mode of time division duplex, channel is sended and received to separate with the time.
It sends and receivees and uses the different time-gap of same frequency carrier wave as the carrying of channel, time resource carries out in two directions
Distribution.In the system based on TDD, the either TD-SCDMA system in 3G epoch or the TDD-LTE system in 4G epoch, only
If all be unableing to do without time synchronization using the system of TDD standard.Because the system of TDD standard is to carry out differentiating uplink and downlink according to the time
Link, therefore the system of all TDD standards can all use and arrive TDD upstream switch signal and TDD downing switch signal, referred to as
For TDD-up signal and TDD-down signal.TDD-LTE system passes through two signals of TDD-up signal and TDD-down signal, control
The opening and closing of uplink processed and downlink.
Referring to Fig. 1, in one embodiment, providing a kind of uplink and downlink detection of loss of mains circuit 100, including signal input
Unit 12, inhibits unit 16, converting unit 18, signal detection unit 20 and state detection unit 22 at converter unit 14.Signal is defeated
Enter unit 12 to be filtered and the output that decays for obtaining the TD standard signal of the output of signal source 201, and to TD standard signal.Become
The output end of the input terminal connection signal input unit 12 of frequency unit 14, for TD standard signal to be downconverted to low frequency.Inhibit
The output end of the input terminal connection converter unit 14 of unit 16, for carrying out AF panel to the TD standard signal after frequency conversion.Turn
The input terminal connection for changing unit 18 inhibits the output end of unit 16, for the TD standard signal after AF panel to be converted to number
Signal.The output end of the input terminal connection converting unit 18 of signal detection unit 20, for detecting TD uplink from digital signal
Switching signal and TD downing switch signal.The output end of the input terminal connection signal detection unit 20 of state detection unit 22 is used
In the level of detection TD upstream switch signal and TD downing switch signal and determine desynchronizing state.
It is appreciated that signal input unit 12 is the circuit unit that TD standard signal is received from signal source, it can be by this
The composition such as filtering device, signal power adjusting device and other ancillary circuit elements in field, as long as having access to signal source
The TD standard signal of output, and the signal power needed for providing can be needed to adjust function according to detection.Converter unit 14
It can be signal frequency conversion element conventional in the communication link of this field, as long as being capable of providing the frequency conversion function to TD standard signal
Energy.Unit 16 is inhibited to can be signal interference straining element or combination of devices conventional in the communication link of this field, such as
Signal filter element or, signal filtering and amplifier element, as long as being capable of providing the interference to the TD standard signal after frequency conversion
Inhibit function.
Converting unit 18, which can be this field, can be realized element or device that analog signal is converted to the function of digital signal
Part combination, as long as being capable of providing required digital signal conversion function.Signal detection unit 20 is signal extracting circuit list
Member can be controller or other kinds of logic circuit in this field, as long as can be opened based on existing in this field
OFF signal extracting mode, the TD upstream switch signal and TD that detecting signal source is transmitted from the digital signal that TD standard signal is converted
Downing switch signal.State detection unit 22 is the level sensitive circuit of logical device composition, can detecte state-detection
The level synchronization state of TD upstream switch signal and TD downing switch signal is meanwhile, it is capable to control uplink into communication equipment
With the unit of downlink switch, TD upstream switch signal and TD downing switch signal needed for output link control.
Signal source 201 is in base station, mobile station or other communication equipments, to generate uplink/downlink in TDD-LTE system
The signal source 201 of TD standard signal, such as baseband chip.The uplink/downlink transmitted in TD standard signal namely TDD-LTE system
Transmit signal.TD upstream switch signal namely TDD-up signal.TD downing switch signal namely TDD-down signal.Actually answering
In, the level of TD upstream switch signal and TD downing switch signal is simultaneously high level or low level, that is, shows uplink
Road and downlink open or close namely TD upstream switch signal and TD downing switch signal step-out simultaneously in identical time slot,
TDD-LTE system is abnormal.Desynchronizing state namely TD upstream switch signal and the current step-out of TD downing switch signal are synchronous
State.
Specifically, signal input unit 12 can directly or indirectly be linked into the signal source of applied communication equipment
201, to obtain the input of TD standard signal from signal source 201, and signal filtering and decaying are carried out, obtains interference level and power
Level is suitable for the TD standard signal that converter unit 14 is handled.After the TD standard signal enters uplink and downlink detection of loss of mains circuit 100, warp
The TD standard signal of low frequency is down-converted to when crossing converter unit 14.The TD standard signal of the low frequency is then output to inhibition unit
16.Inhibit unit 16 to carry out AF panel to the TD standard signal after down coversion, such as inhibit associated stray and interference signal etc.,
To ensure the validity of processing of the subsequent cell to signal.Hereafter, the TD standard signal after AF panel (for analog signal) into
Enter converting unit 18, be converted into corresponding digital signal and be output to signal detection unit 20.Signal detection unit 20 can be from
Detecting signal source 201 is transmitted to TD upstream switch signal and TD downing switch signal in link in the digital signal received.
The level of obtained TD upstream switch signal and TD downing switch signal is detected by state detection unit 22, by TD
The level of row switching signal and TD downing switch signal, to judge that TD upstream switch signal and TD downing switch signal are currently mistake
Step or synchronous state.
Above-mentioned uplink and downlink detection of loss of mains circuit 100 obtains the TD standard that signal source 201 generates by signal input unit 12
Signal and after adjusting power, the TD standard signal of low frequency is downconverted to by converter unit 14, and then inhibited unit 16 is to low
The TD standard signal of frequency carries out AF panel, and the TD standard signal after AF panel is converted to digital signal by reconvert unit 18
It exports to signal detection unit 20.Signal detection unit 20 detects the TD for including in the TD standard signal after being converted to digital signal
Upstream switch signal and TD downing switch signal, and export to state detection unit 22.Finally detected by state detection unit 22
The level of TD upstream switch signal and TD downing switch signal, can be according to TD upstream switch signal and TD downing switch signal
Level state, directly determine two switching signal whether step-out.The synchronization decisions of switching signal, response are carried out based on circuit hardware
Speed is fast and precision is higher, and stability is more preferable, has achieved the purpose that greatly improve uplink and downlink step-out judging efficiency, circuit is applicable in
Range is wide.
Referring to Fig. 2, in one embodiment, state detection unit 22 includes NAND gate 221, first and door 222, second
With door 223 and nor gate 224.First output end of the first input end connection signal detection unit 20 of NAND gate 221.With it is non-
The second output terminal of second input terminal connection signal detection unit 20 of door 221.The output end of NAND gate 221 is separately connected first
With door 222 and second with the first input end of door 223.First connect the first defeated of NAND gate 221 with the second input terminal of door 222
Enter end.First is used for the first switch signal end of connecting link control switching circuit with the output end of door 222.Second with door 223
The second input terminal connection NAND gate 221 the second input terminal.Second is used for connecting link switching control with the output end of door 223
The second switch signal end of circuit.The first input end connection first of nor gate 224 and the output end of door 222.Nor gate 224
The output end of second input terminal connection second and door 223.The output end of nor gate 224 is used for connection status prompt unit.
It, can also be with it is appreciated that NAND gate 221 can be the three end NAND gates 221 of two input terminals and an output end
It is the multiterminal NAND gate 221 of multiple input terminals and an output end, specifically can needs to carry out flexible choice according to application, as long as
It can be realized the electrical level judging and protection to TD upstream switch signal and TD downing switch signal.For first with door 222,
Second can similarly understand with the input terminal quantity of door 223 and nor gate 224.Link switching control circuit namely refer to that communication is set
The unit of standby middle control uplink and downlink switch.Condition prompting unit is uplink/downlink switch letter in communication equipment
Number desynchronizing state prompt unit, can be, but not limited to be remote alarm circuit unit, for communication both-end (such as base station and shifting
Dynamic platform) master controller report upstream switch signal and downing switch signal be currently at the state of step-out, or scene is accused
Alert circuit unit, for reporting upstream switch signal and downlink to the master controller of affiliated communication equipment (base station or mobile station)
Switching signal step-out.
Specifically, two for exporting TD upstream switch signal and TD downing switch signal in signal detection unit 20 respectively are defeated
Two input terminals of outlet, NAND gate 221 can be respectively connected to two output ends of signal detection unit 20.It is detected with signal
The switching signal of the first output end output of unit 20 is TD upstream switch signal, and the second output terminal of signal detection unit 20 is defeated
Switching signal out is for TD downing switch signal: assuming that TD upstream switch signal is high level 1, TD downing switch signal is
Low level 0.So, after entering state detection unit 22, the port level of each gate circuit is as follows: the first of NAND gate 221 is defeated
Enter and holds A1=1, the second input terminal B1=0.The output end Y1=1 of NAND gate 221.First with the first input end B2=of door 222
1, the second input terminal A2=1, then first with the output end Y2=1 of door 222.Second with the first input end A3=1 of door 223,
Second input terminal B3=0, then second with the output end Y3=0 of door 223.The first input end A4=1 of nor gate 224, second
Input terminal B4=0, then the output end Y4=0 of nor gate 224.
Since TD upstream switch signal is high level 1, TD downing switch signal is low level 0, which is symbol
Close actual use situation.Therefore the level (0) of the output end of nor gate 224 corresponds to the state of current sync, condition prompting
Unit does not alert and (carries out step-out alarm when condition prompting unit default setting is high level).In addition, there is not step-out announcement
When alert, first is consistent with the logic (level) of the output end Y2 of door 222 and the logic (level) of TD upstream switch signal,
That is the protected output of TD upstream switch signal.Second opens with the logic and TD downlink of the logic (level) of the output end Y3 of door 223
The logic (level) of OFF signal is also consistent namely the protected output of TD downing switch signal.In this way, link switching control electricity
Road can receive normal TD upstream switch signal and TD downing switch signal.
Assuming that TD upstream switch signal is high level 1, TD downing switch signal is low level 1.So, state inspection is entered
After surveying unit 22, the port level of each gate circuit is as follows: the first input end A1=1, the second input terminal B1=1 of NAND gate 221.
The output end Y1=0 of NAND gate 221.First with the first input end B2=0, the second input terminal A2=1, then first of door 222
With the output end Y2=0 of door 222.Second with first input end A3=0, the second input terminal B3=1 of door 223, then second with
The output end Y3=0 of door 223.First input end A4=0, the second input terminal B4=0 of nor gate 224, then nor gate 224
Output end Y4=1.
Since TD upstream switch signal is high level 1, TD downing switch signal is high level 1, which is not
Meet actual use situation.Therefore the level (1) of the output end of nor gate 224 corresponds to the state of current step-out, and state mentions
Show that unit alerts.In addition, when there is step-out alarm, first opens with the logic (level) and TD uplink of the output end Y2 of door 222
The logic (level) of OFF signal is inconsistent namely the protected output of TD upstream switch signal.Second with the output end of door 223
The logic of the logic (level) of Y3 and the logic (level) of TD downing switch signal are also inconsistent namely TD downing switch letter
Number protected output.In this way, link switching control circuit can receive the TD upstream switch signal not being available and TD downlink
Switching signal plays the role of protecting device in link so that uplink does not work with downlink.For TD uplink
When switching signal and TD downing switch signal are all low level 0, can similarly it understand.
About the level change situation of TD upstream switch signal and TD downing switch signal, may refer to as shown in Table 1
Truth table:
Table 1
| TD-up | TD-down | Nor gate output signal | TD-up after protection | TD-down after protection |
| 1 | 0 | 0 | 1 | 0 |
| 0 | 1 | 0 | 0 | 1 |
| 0 | 0 | 1 | 0 | 0 |
| 1 | 1 | 1 | 0 | 0 |
For the switching signal exported with the first output end of signal detection unit 20 for TD downing switch signal, signal detection is single
When the switching signal of the second output terminal output of member 20 is for TD upstream switch signal, can similarly it understand.By above-mentioned
The circuit hardware of state detection unit 22 designs, can be by TD upstream switch signal and TD downing switch signal effectively and faster
The desynchronizing state judgement of switching signal is realized fastly, and the circuit reliability of link can be improved.
It in one embodiment, further include NOT gate about above-mentioned state detection unit 22.The input terminal of NOT gate connect or
The output end of NOT gate 224.The output end of NOT gate is used for connection status prompt unit.
It is appreciated that when condition prompting unit default setting is low level under the application scenarios of progress step-out alarm, shape
State detection unit 22 can also access NOT gate in the output end of nor gate 224 in going back, and realize TD upstream switch signal and TD downlink
When switching signal is all high level 1 or low level 0, to condition prompting unit export low level, triggering state prompt unit into
The alarm of row step-out.The circuit design of state detection unit 22 through this embodiment can effectively realize the step-out of switching signal
State judgement and step-out alarm triggered, can also effectively improve the circuit reliability of link.
Referring to Fig. 3, in one embodiment, signal input unit 12 includes high frequency filter 122 and digital pad
124.The input terminal of high frequency filter 122 is used for connecting signal source 201.The output end of high frequency filter 122 connects digital attenuation
The input terminal of device 124.The input terminal of the output end connection converter unit 14 of digital pad 124.
It is appreciated that the working frequency range of high frequency filter 122 can be selected according to the frequency range of 201 output signal of signal source
It selects, for the TD standard signal needed for receiving the signal of the output of signal source 201 and exporting.Digital pad 124 can be ability
Any type signal attenuator in domain, if the signal power for the TD standard signal that high frequency filter 122 exports can be adjusted to
Certain watt level is suitable for the processing of converter unit 14.
Specifically, the input terminal namely signal input part of high frequency filter 122 can be directly accessed signal source 201, or
It accesses signal source 201 indirectly by additional device, obtains required TD system to obtain output signal from signal source 201 and filter
Formula signal.It may include above-mentioned TD upstream switch signal and TD downing switch signal and other need in the TD standard signal
It to be transferred to the signal of opposite equip. in a link.The output end namely signal output end of high frequency filter 122 can directly connect
The input terminal of digital pad 124 is connect, the input terminal of digital pad 124 can also be indirectly connected with by additional device, as long as
It can ensure that digital pad 124 can effectively receive the TD standard signal of output of high frequency filter 122.Number declines
After subtracting the TD standard signal that device 124 receives the output of high frequency filter 122, the signal power of the TD standard signal is adjusted to one
The signal power of a suitable TD standard signal processing, and output power TD standard signal adjusted is become to converter unit 14
Frequency is handled.
By above-mentioned high frequency filter 122 and digital pad 124, uplink and downlink detection of loss of mains circuit 100 can be convenient
Ground access signal source 201 simultaneously obtains the input of TD standard signal, and the TD standard signal of input exports after power attenuation to frequency conversion
Unit 14 carries out subsequent processing, high reliablity and applicability is good.
In one embodiment, as shown in figure 3, converter unit 14 includes frequency mixer 142, the first balun 144 and local vibration source
146.The output end of the first input end connection digital pad 124 of frequency mixer 142.Second input terminal of frequency mixer 142 connects
The output end of local vibration source 146.First output end of frequency mixer 142 connects the first differential port of the first balun 144.Frequency mixer
142 second output terminal connects the second differential port of the first balun 144.The single-end port connection of first balun 144 inhibits single
The input terminal of member 16.
It is appreciated that in the above-described embodiments, converter unit 14 can be frequency mixer 142 and balun composition, converter unit
14 can obtain required local oscillation signal from the local oscillation circuit of the communication equipment of application, defeated to digital pad 124 to complete
The down-converted of TD standard signal out.In the present embodiment, needed for being provided using the local vibration source 146 being independently arranged
Local oscillation signal, the frequency of local oscillation signal caused by local vibration source 146 can be according to the TD standard signal after down-converted
Frequency needs to be selected.Local vibration source 146 can be various local oscillation circuit unit or independent clock devices in this field,
As long as being capable of providing local oscillation signal needed for down coversion.
Specifically, after the TD standard signal that digital pad 124 exports enters frequency mixer 142, in frequency mixer 142 and originally
The local oscillation signal that vibration source 146 exports carries out Frequency mixing processing, thus TD standard signal that digital pad 124 is exported, high frequency
The TD standard signal of low frequency is down-converted to, so as to the signal processing of subsequent cell.TD standard signal after down coversion, namely from mixed
The signal for the two-pass DINSAR that frequency device 142 exports completes differential signal by the first balun 144 and turns single-ended signal output.Output
The TD standard signal of single-ended signal namely low frequency, which will enter, inhibits unit 16 to carry out AF panel processing.Pass through above-mentioned frequency conversion
The design of unit 14, the high frequency that can efficiently and securely complete TD standard signal turn low frequency.
In one embodiment, as shown in figure 3, inhibiting unit 16 includes low-frequency filter 162.Low-frequency filter 162
Input terminal connects the single-end port of the first balun 144.The input terminal of the output end connection converting unit 18 of low-frequency filter 162.
It is appreciated that the working frequency of low-frequency filter 162 can be selected according to the frequency of the TD standard signal of low frequency
It selects.Low-frequency filter 162 can be single filter, be also possible to the mixing low-frequency filter being made of several filters
162, if the TD standard signal for the low frequency that can be exported by the first balun 144, and filter out the associated stray signal in signal
With other interference signals.
Specifically, TD standard signal after down coversion is after the output of the single-end port of the first balun 144, into low frequency filtering
Device 162.The associated stray signal for including in signal when TD standard signal after down coversion passes through low-frequency filter 162 and other
Interference signal is located at except the passband of low-frequency filter 162 due to frequency, and is filtered out by low-frequency filter 162.Hereafter, low frequency is filtered
TD standard signal after the output AF panel of wave device 162 carries out signal conversion processes to converting unit 18.
It is handled by the AF panel of above-mentioned low-frequency filter 162, can effectively inhibit spuious and other interference signals
Interference to the TD standard signal after down coversion, thus ensure processing of the subsequent cell to TD standard signal accuracy and effectively
Property, improve the judgement accuracy of desynchronizing state.
Referring to Fig. 4, in one embodiment, inhibiting unit 16 further includes low-frequency amplifier 164.Low-frequency filter 162
Output end by low-frequency amplifier 164 connect converting unit 18 input terminal.
It is appreciated that the working frequency of low-frequency amplifier 164 can be selected according to the frequency of the TD standard signal of low frequency
It selects, the TD standard signal for exporting to low-frequency filter 162 carries out signal power amplification.The magnification level of signal power can be with
It is determined according to the processing of converting unit 18 and signal detection unit 20 needs.Low-frequency amplifier 164 can be single amplification
Device is also possible to the multistage low-frequency amplifier 164 being made of several amplifiers, as long as can export to low-frequency filter 162
The signal power of TD standard signal be amplified to required power.
Specifically, the signal power for the TD standard signal that low-frequency filter 162 exports is generally relatively low, therefore can also pass through
Low-frequency amplifier 164 carries out signal power enhanced processing to the TD standard signal that low-frequency filter 162 exports, by low frequency filtering
The signal power for the TD standard signal that device 162 exports is adjusted to certain performance number, so that subsequent converting unit 18, signal are examined
Unit 20 and state detection unit 22 can obtain the input signal of enough watt levels out, to preferably ensure subsequent cell
To the precision of the processing of TD standard signal, to further increase the accuracy of judgement degree of the desynchronizing state of uplink/downlink switching signal.
Referring to Fig. 5, in one embodiment, converting unit 18 includes the second balun 182 and analog-digital converter 184.The
The single-end port connection of two baluns 182 inhibits the output end of unit 16.The first differential port connection modulus of second balun 182 turns
184 first input end of parallel operation.Second differential port of the second balun 182 connects 184 second input terminal of analog-digital converter.Modulus turns
The input terminal of the output end connection signal detection unit 20 of parallel operation 184.
Specifically, the TD standard signal after low frequency filtering or low frequency filtering and low frequency enhanced processing is single from inhibition
After 16 output of member, exports, formed into the single-end port of the second balun 182, and from two differential ports of the second balun 182
The analog signal input analog-to-digital converter 184 of two-pass DINSAR.Low frequency TD standard signal after analog-digital converter 184, by mould
Quasi- signal is changed into digital signal and is output to signal detection unit 20, in order to the processing of signal detection unit 20.
After above-mentioned converting unit 18, the low frequency TD standard signal of simulation can be changed into corresponding number letter
Number, it is suitable for signal detection unit 20 and carries out signal extraction processing, obtains required TD upstream switch signal and TD downing switch
Signal, so that it is guaranteed that state detection unit 22 can effectively realize the level detection of signal.
Referring to Fig. 6, in one embodiment, signal detection unit 20 includes fpga chip or CPLD device.
Optionally, signal detection unit 20 is digital signal processing unit, can pass through general calculation conventional in the art
Method extracts TDD-up signal and TDD-down signal from digital signal.Signal detection unit 20 can be in this field
Fpga chip or CPLD device can also be other digital processing chips in this field, such as structured ASIC chip, as long as
It is implemented for the extraction of TDD-up signal and TDD-down signal.The concrete application chip class of signal detection unit 20
Type can according in application signal detector efficiency and application cost etc. carry out flexible choice.
For using application fpga chip as signal detection unit 20, the major function of fpga chip is to baseband signal
(namely TD standard signal from signal source 201) is handled, and TD standard signal is found in the operation of charge completion signal
Descending pilot frequency time slot, and the descending synchronous code for the cell being synchronized to is found out, TD uplink is then extracted from baseband signal to be opened
OFF signal and TD downing switch signal.The TD upstream switch signal and TD downing switch signal extracted can be used as input reference
Signal carries out level detection by state detection unit 22 and desynchronizing state judges into state detection unit 22；It is opened in TD uplink
When OFF signal still keeps synchronous with TD downing switch signal, state detection unit 22 is by the TD upstream switch signal and TD after protection
Downing switch signal, which exports, gives link switching control circuit, to guarantee accurate uplink downlink switching control.
By the application of above-mentioned fpga chip or CPLD device, can efficiently complete under TD upstream switch signal and TD
The detection of row switching signal.
In one embodiment, a kind of communication equipment is also provided, including above-mentioned uplink and downlink detection of loss of mains circuit 100.It can
To understand, specific structure and its explanation of uplink and downlink detection of loss of mains circuit 100 in this present embodiment are closed, may refer to
The explanation in each embodiment about uplink and downlink detection of loss of mains circuit 100 is stated, it is not reinflated herein to carry out repeating detailed description.Communication
Equipment can be each communication node in this field in TDD-LTE system, such as base station and all kinds of mobile stations.
Using the communication equipment of above-mentioned uplink and downlink detection of loss of mains circuit 100, the TD standard signal that signal source 201 generates,
After entering uplink and downlink detection of loss of mains circuit 100 by signal input unit 12, by the place of uplink and downlink detection of loss of mains circuit 100
Reason after obtaining the TD upstream switch signal for including in signal and TD downing switch signal, is detected on TD by state detection unit 22
The level of row switching signal and TD downing switch signal, can be according to the level of TD upstream switch signal and TD downing switch signal
State, directly determine two switching signal whether step-out.The synchronization decisions of switching signal, response speed are carried out based on circuit hardware
It is higher with precision, and stability is more preferable, has achieved the purpose that effectively improve uplink and downlink step-out judging efficiency.
Referring to Fig. 7, in one embodiment, communication equipment 200 further includes condition prompting unit 202.Condition prompting list
The output end of the state detection unit 22 of the signal end connection uplink and downlink detection of loss of mains circuit of member 202.Condition prompting unit 202 is used
When receiving the step-out alarm signal of the output of state detection unit 22, step-out alarm is carried out.
It is appreciated that condition prompting unit 202 is the warning circuit unit being arranged in communication equipment, it is used for communication equipment
Master devices carry out step-out alarm, such as to master devices export step-out indication signal (such as high level or low level), with
The current TD upstream switch signal of master devices and TD downing switch signal step-out are informed, so that master devices carry out corresponding step-out
Processing, such as restore the synchronous regime of TD upstream switch signal and TD downing switch signal, or report up and down to Network Management Equipment
The report etc. of line link exception.Condition prompting unit 202 can be used on other communication equipment remote reportings currently connected
The abnormality of downing switch signal step-out, to carry out step-out alarm to other communication equipments currently connected, notice currently connects
Other communication equipments connect stop request transmission of traffic or attempt to carry out remote synchronization recovery etc..Condition prompting unit
202 can also carry out step-out alarm by way of light or auditory tone cues for the communication equipment at place, such as, but not limited to adopt
Use light emitting diode perhaps other light indicator elments as main alarm device light prompt unit using buzzer or other sounds
Sound prompt unit of the frequency alarm element as main alarm device.
Specifically, when state detection unit 22 determine TD upstream switch signal it is synchronous with TD downing switch signal when,
I.e. the level of TD upstream switch signal and TD downing switch signal each other low and high level when, state detection unit 22 export level
Signal will not the progress step-out alarm of triggering state prompt unit 202.When state detection unit 22 determines TD upstream switch signal
With when TD downing switch signal step-out namely the level of TD upstream switch signal and TD downing switch signal be all high level or
When low level, state detection unit 22 export level signal will triggering state prompt unit 202 carry out step-out alarm, at this time
The level signal that state detection unit 22 exports is step-out alarm signal (can be high level and be also possible to low level).
By above-mentioned condition prompting unit 202, can state detection unit 22 detect TD upstream switch signal and
TD downing switch signal step-out, and control uplink and downlink and do not work protects circuit devcie in link simultaneously,
Step-out alarm prompt is carried out, the further reliability for improving circuit is also convenient for safeguarding.
In one embodiment, condition prompting unit includes trigger or radio-frequency front-end.Optionally, in a communications device,
Step-out alarm can be realized by trigger, for example, when state detection unit 22 determines TD upstream switch signal and TD downlink
When switching signal step-out, state detection unit 22 exports step-out alarm signal (high level or low level) and arrives trigger, triggering
Device exports step-out indication signal (such as high level or low electricity to the master devices of communication equipment under the triggering of step-out alarm signal
It is flat), to inform the current TD upstream switch signal of master devices and TD downing switch signal step-out.In another example when state-detection list
When member 22 determines TD upstream switch signal and TD downing switch signal step-out, state detection unit 22 exports step-out alarm signal
(high level or low level) arrives radio-frequency front-end, to carry out step-out announcement to other communication equipments currently connected by radio-frequency front-end
It is alert, notify other communication equipments currently connected to stop request transmission of traffic or attempt to carry out remote synchronization recovery etc..
By the application of above-mentioned condition prompting unit 202, efficient step-out alarm function is provided, and step-out alarm is realized simply.
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
Only several embodiments of the present invention are expressed for above embodiments, and the description thereof is more specific and detailed, but can not
Therefore it is construed as limiting the scope of the patent.It should be pointed out that for those of ordinary skill in the art,
Under the premise of not departing from present inventive concept, various modifications and improvements can be made, and these are all within the scope of protection of the present invention.
Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (11)
1. a kind of uplink and downlink detection of loss of mains circuit characterized by comprising
Signal input unit, for obtain signal source output TD standard signal, and to the TD standard signal be filtered with
Decaying output；
Converter unit, input terminal connect the output end of the signal input unit, for export the signal input unit
TD standard signal downconverts to low frequency；
Inhibit unit, input terminal connects the output end of the converter unit, for carrying out to the TD standard signal after frequency conversion
AF panel；
Converting unit, input terminal connects the output end for inhibiting unit, for by the TD standard signal after AF panel
Be converted to digital signal；
Signal detection unit, input terminal connect the output end of the converting unit, for detecting TD from the digital signal
Row switching signal and TD downing switch signal；
State detection unit, input terminal connect the output end of the signal detection unit, for detecting the TD upstream switch letter
Number and TD downing switch signal level and determine desynchronizing state.
2. uplink and downlink detection of loss of mains circuit according to claim 1, which is characterized in that the state detection unit include with
NOT gate, first and door, second and door and nor gate, the first input end of the NAND gate connect the signal detection unit
First output end, the second input terminal of the NAND gate connect the second output terminal of the signal detection unit, the NAND gate
Output end be separately connected described first with door and described second with the first input end of door；
Described first connect the first input end of the NAND gate with the second input terminal of door, and described first uses with the output end of door
In the first switch signal end of connecting link control switching circuit；
Described second connect the second input terminal of the NAND gate with the second input terminal of door, and described second uses with the output end of door
In the second switch signal end for connecting the link switching control circuit；
The first input end of the nor gate connects the output end of described first Yu door, the second input terminal connection of the nor gate
Described second is used for connection status prompt unit with the output end of door, the output end of the nor gate.
3. uplink and downlink detection of loss of mains circuit according to claim 2, which is characterized in that the state detection unit further includes
NOT gate, the input terminal of the NOT gate connect the output end of the nor gate, and the output end of the NOT gate is for connecting the state
Prompt unit.
4. uplink and downlink detection of loss of mains circuit according to claim 2 or 3, which is characterized in that the signal detection unit packet
Include fpga chip or CPLD device.
5. uplink and downlink detection of loss of mains circuit according to any one of claims 1 to 3, which is characterized in that the signal input
Unit includes high frequency filter and digital pad, and the input terminal of the high frequency filter is described for connecting the signal source
The output end of high frequency filter connects the input terminal of the digital pad, and the output end of the digital pad connects the change
The input terminal of frequency unit.
6. uplink and downlink detection of loss of mains circuit according to claim 5, which is characterized in that the converter unit includes mixing
Device, the first balun and local vibration source；
The first input end of the frequency mixer connects the output end of the digital pad, and the second input terminal of the frequency mixer connects
The output end of the local vibration source is connect, the first output end of the frequency mixer connects the first differential port of first balun, institute
The second output terminal for stating frequency mixer connects the second differential port of first balun；
The single-end port of first balun connects the input terminal for inhibiting unit.
7. uplink and downlink detection of loss of mains circuit according to claim 6, which is characterized in that the inhibition unit includes low frequency filter
Wave device, the input terminal of the low-frequency filter connect the single-end port of first balun, the output end of the low-frequency filter
Connect the input terminal of the converting unit.
8. uplink and downlink detection of loss of mains circuit according to claim 7, which is characterized in that the inhibition unit further includes low frequency
Amplifier, the output end of the low-frequency filter connect the input terminal of the converting unit by the low-frequency amplifier.
9. according to uplink and downlink detection of loss of mains circuit described in claim 6,7 or 8, which is characterized in that the converting unit includes
Second balun and analog-digital converter；
The single-end port of second balun connects the output end for inhibiting unit, the first differential port of second balun
The analog-digital converter first input end is connected, the second differential port of second balun connects the analog-digital converter second
Input terminal；
The output end of the analog-digital converter connects the input terminal of the signal detection unit.
10. a kind of communication equipment, which is characterized in that including the described in any item uplink and downlink detection of loss of mains electricity of claim 1 to 9
Road.
11. communication equipment according to claim 10, which is characterized in that further include condition prompting unit, the state mentions
Show that the signal end of unit connects the output end of state detection unit in the uplink and downlink detection of loss of mains circuit；
When the condition prompting unit is used to receive the step-out alarm signal of the state detection unit output, step-out announcement is carried out
It is alert.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910703655.8A CN110300421B (en) | 2019-07-31 | Uplink and downlink step-out detection circuit and communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910703655.8A CN110300421B (en) | 2019-07-31 | Uplink and downlink step-out detection circuit and communication equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110300421A true CN110300421A (en) | 2019-10-01 |
| CN110300421B CN110300421B (en) | 2024-04-26 |
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