CN202197283U - Communication relay device and standing-wave ratio detection device thereof - Google Patents
Communication relay device and standing-wave ratio detection device thereof Download PDFInfo
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Abstract
The utility model discloses a communication relay device and standing-wave ratio detection device that adopts thereof, it includes: the coupler is used for coupling a transmission power signal amplified by the closed-loop power control unit; the time slot switch is used for gating the reflected power signal of the uplink of the antenna port and the coupled transmitting power signal according to the uplink and downlink time slots of the communication system; the power divider is used for dividing all power signals gated by the time slot switch into a power detection tube and a feedback frequency conversion link of the closed-loop power control unit; the power detection tube converts each power signal into a corresponding voltage signal; the analog-to-digital converter is used for converting each voltage signal from an analog format to a digital format; and the calculating unit is used for calculating the return loss of the antenna port by using the reflected voltage signal and the transmitted voltage signal which are in a digital format, so as to determine the standing wave ratio. The utility model discloses with simple and easy circuit and cheap cost, realized the detection of standing-wave ratio, be particularly useful for among the broadband communication system.
Description
[technical field]
The utility model relates to the communication repeating device such as base station, Remote Radio Unit of having used the digital pre-distortion technology power amplification system in the GSM, is specifically related to a kind of standing wave ration detection device wherein.
[background technology]
Wireless communication field has adopted the communication repeating devices such as base station, digital long-drawn unit of the power amplifying system of digital pre-distortion technology all to need be connected with antenna.The antenna port of relay causes having a strong impact on the operate as normal and the various RF index of communication system because impedance mismatching can produce very big reflected signal.Can in time find and deal with problems through detecting standing-wave ratio, occur when unusual when detecting standing-wave ratio, be able to alarm or the communication close relay in power amplifying system.
The reason of antenna port impedance mismatch comprises main conditions such as antenna port impedance does not match and various device electric properties are inconsistent, ambient temperature, and especially in the communication system with big bandwidth, this mismatch does not have certain rules.Past two kinds of solutions commonly used are that this dual mode all can increase design difficulty and design cost through the error or the Design of Broadband standing wave detection circuit of reduction power detection pipe, more crucial, whether producing effect, it is uncertain also to exist.A lot of schemes commonly used at present have common part, increase the reflection power testing circuit exactly, but this type scheme have strengthened the PCB area, have increased the complexity of system.
Disclose a kind of method for detecting standing wave, standing wave detecting device and base station in the CN101557601 patent application that Huawei Tech Co., Ltd., Shanghai proposes, its power amplification control circuit by closed loop obtains forward power and backward power is carried out the detection of standing wave ratio.This scheme requires related chip must accomplish the calculating of high complexity, and is corresponding to performance, the higher requirement of cost proposition of chip, also comparatively complicated when technology realizes.
Therefore, avoid adopting special-purpose testing circuit, simplification technology to realize difficulty, reduce and realize cost, the key that becomes current standing-wave ratio detection technique field is considered.
[utility model content]
The main purpose of the utility model is to overcome above-mentioned deficiency, and a kind of standing wave ration detection device is provided, and realizes the detection of communication repeating device to the concrete numerical value of its antenna port standing-wave ratio with easy mode.
Another purpose of the utility model is to provide a kind of communication repeating device, to use said standing wave ration detection device.
For realizing the purpose of the utility model, the utility model adopts following technical scheme:
The standing-wave ratio value detection device of the utility model is used to detect the standing wave ratio of the antenna port of communication system, and it comprises: coupler, the transmitting power signal of exporting to this antenna port after the route closed-loop power control unit that is coupled amplifies; The time slot switch is according to the reflected power signal of corresponding this antenna port of gating of the uplink and downlink time slot of this communication system, the transmitting power signal of said coupling; Power splitter is all assigned to each power signal of time slot switch institute gating in the feedback frequency conversion link of power detection pipe and said closed-loop power control unit; Said power detection pipe will pass through wherein each power signal and convert the correspondent voltage signal into; Analog to digital converter converts said each voltage signal into number format from analog format; Computing unit utilizes the reflected voltage signal that is number format to calculate the return loss of antenna port with the emission voltage signal, thereby confirms standing-wave ratio.
Further, be serially connected with attenuator between said coupler and the time slot switch, be used for the transmitting power signal of said coupling is carried out gain-adjusted.Said power detection pipe is the RMS power detector.The transmitting power signal of said closed-loop power control unit output is descending to this antenna port through circulator.Said antenna port is connected to filter, to carry out filtering to the descending transmitting power signal of circulator with to the reflected power signal that antenna port is transferred to said time slot switch.Concrete, said time slot switch is a RF switch.
The communication repeating device of the utility model, it comprises aforesaid standing wave ration detection device.This communication repeating device also comprises: balanced type LNA unit is used for isolating and being given to up link after amplifying with low noise going the two-way branch of signal on the way.
Said balanced type LNA unit comprises: attenuator is used for the upward signal of said antenna port is carried out gain-adjusted; First electric bridge will be shunted to two output links through the up signal of said circulator, and its isolated port forms said reflected power signal thus; The amplitude limiter that is provided with in described each output link is used to prevent that said upward signal from surpassing preset power magnitude; The RF switch that is provided with in described each output link is used for when transmission time slot improving the isolation of the transmitting power signal of upward signal reflected power signal and doping; The low noise amplifier that is provided with in described each output link is used to amplify the upward signal after the said isolation; Described second electric bridge, the upward signal after being used for two output links with said first circuit and amplifying close behind the road up.
Compared with prior art, the utlity model has following advantage:
1, through the amplifying signal output from the closed-loop power control unit be coupled one road signal as the transmitting power signal, adopt the isolated port of balanced type LNA receive this transmitting power signal at antenna port because the reflected power signal that impedance mismatching causes; Carry out power detection according to this transmitting power signal and reflected power signal; Final through calculating the standing-wave ratio of this antenna port, avoid the use of special-purpose testing circuit.
2, combine the feedback frequency conversion link of closed-loop power control unit to have the advantages that intelligently only handle the downlink signal according to system time gap; Realization is to the reasonable utilization of the different time-gap of time division communication system; At different time-gap transmitting power signal and reflected power signal are carried out ruly processing; It is thus clear that the electrical structure of the utility model, signal processing flow are all comparatively simple.
3, only utilized reflected power signal, transmitting power conversion of signals and digital reflected voltage signal, digital transmission voltage signal carry out the power difference and calculate; Draw return loss; And in a preset tables of data, retrieve corresponding standing wave ratio with return loss; Such implementation method makes its computation complexity reduce greatly, and is lower to the characteristic requirements of chip, and its system realizes that cost is also just lower naturally.
4, the utlity model has common adaptability; Standing wave ration detection device of the utility model and correlation method thereof are applicable to that the form of equipment comprises but do not limit base station, Remote Radio Unit, tower amplifier, repeater etc. in the time division duplex standard broadband connections relay that downstream signal is amplified the various employing closed-loop power controls unit power amplification system of digital pre-distortion technology (adopt DPD).
5, the utility model obviously is different from prior art and another comparatively outstanding characteristics are: because the aforementioned alleged low advantage of computation complexity that the utlity model has; Be particularly useful for handling broadband system; In the actual measurement, the WiMAX signaling mode in working band is the 2500MHz-2650MHz scope has higher standing-wave ratio accuracy of detection and extremely short detection time.
[description of drawings]
Fig. 1 is the theory diagram of local circuit of the communication repeating device of the utility model.
[embodiment]
Below in conjunction with accompanying drawing and embodiment the utility model is further described:
See also patent announcements such as CN101110571, CN101499777; It all discloses the structure and the principle of the power amplifier of known employing digital pre-distortion technology (DPD) realization; Summing up the electrical structure characteristics of DPD power amplifier can know; Power amplifier carries out processing and amplifying to downstream signal; Signal after the amplification is by in the coupler coupling back feed-in feedback frequency conversion link, be provided with control circuit in this feedback frequency conversion link in case utilize this signal that is coupled to carry out pre-distortion also again in the feed-in down link to be transferred to power amplifier, finally reach the purpose that offsets.Thus, the promotion pipes at different levels of power amplifier, the coupler of coupled power amplifier output signal, the feedback frequency conversion link that is used to carry out pre-distortion constitute the power control unit of closed loop jointly, are called for short the closed-loop power control unit.The transmitting of the down link that is coupled to of feedback frequency conversion link used by the utility model in this closed-loop power control unit.
Following explanation sees also Fig. 1.Fig. 1 has disclosed the local circuit theory diagram of the communication repeating device of the utility model, specifically is to disclose it near the antenna-feedback system part.Well-known, each all has the electrical structure that communication system signal is carried out the uplink and downlink link disjoint such as communication repeating devices such as base station, Remote Radio Unit, repeater, tower amplifiers.The utility model carries out the standing-wave ratio detection to the transmitting power signal of down link and the reflected power signal of antenna port; And disclosing standing wave ration detection device and corresponding detecting method thereof, these apparatus and method mainly are that the closed-loop power control unit and the antenna port reflects power signal that are used in its down link are realized.Because the caused electric property of standing wave ration detection device that is provided with in the down link and circulator changes, correspondingly also need in up link, do adaptive configuration.
Among Fig. 1, communication repeating device and antenna have been established annexation, have inserted filter 2 between the antenna port of antenna 1 and communication repeating device, so that upward signal and downstream signal are carried out Filtering Processing.It is outer spuious to reduce unnecessary band, and the antenna port of communication repeating device realizes that through circulator 5 and filter 2 signal is connected and realizes the Signal Separation and the He Lu of uplink and downlink link.Annexation between each port of antenna 1 and each antenna port of communication repeating device confirms, the problem that antenna port impedance mismatch or other reason are caused need be solved by the detection to the standing-wave ratio of each antenna port.Therefore, in the down link of communication repeating device, introduced two paths of signals and solved.
First via signal in the said two paths of signals is a downstream signal after the amplification of power amplifier 41 output; Promptly be used to be transferred to the transmitting power signal that launch in day alignment space, its power amplifier 41 outputs in the closed-loop power control unit of down link generate and line output under said circulator 5 detours continued.This transmitting power signal is got by coupler intrinsic in the closed-loop power control unit 61 couplings.
Coupling and signal fixing or adjustable attenuator 62 carries out signal gain control by communication repeating device set, for example in the present embodiment to coupling and the signal attenuation of carrying out 20dB of transmitting power signal regulate.
The second road signal in the said two paths of signals is the upward signal that antenna port reflects is returned; It directly is cited with the form of reflected power signal after filter 2 Filtering Processing, and this reflected power signal promptly gets into time slot switch 63 without special processing after getting into the communication repeating device.
The communication repeating device is provided with the time slot switch 63 that is used for said transmitting power signal and reflected power signal are selected a gating.As its name suggests, the communication system that adapted to of communication repeating device is the communication system of time division duplex standard (TDD).Said time slot switch 63 is selected RF switch for use, for same antenna port, adapts to the situation have only that riches all the way and penetrate power signal and reflected power signal, and preferably the alternative RF switch is realized.And for a plurality of antenna ports, then use multiselect one RF switch adaptively, and also can adopt a plurality of alternative RF switch combinations, realize the high-isolation between multichannel.Time slot switch 63 is based on time-division principle; The said reflected power signal of ascending time slot gating in communication system; At the said transmitting power signal of communication system down link time slot gating; If there is the standing wave of a plurality of antenna ports to detect, promptly increase the alternative RF switch accordingly, the emission of the corresponding antenna port of each switch, the detection of reflected power signal.
Be transferred in the set power splitter of communication repeating device 64 by the said reflected power signal of said time slot switch 63 gatings and transmitting power signal; Two of this power splitter 64 are distributed port respectively the signal---transmitting power signal or reflected power signal---that it received to be assigned to two branch roads, and wherein one of branch road is the feedback frequency conversion link of (DPD) of the said closed-loop power control of feed-in unit; Two of branch road promptly is to be transferred in the set power detection pipe 66 of communication repeating device.
Because the control circuit in the feedback frequency conversion link 65 of closed-loop power control unit has the function that time slot and corresponding signal thereof are discerned; Therefore; Although the signal of said power splitter 64 feed-ins not only comprises said transmitting power signal, also comprised reflected power signal, reflected power signal wherein can be ignored by the control circuit of feedback frequency conversion link 65; Perhaps, feedback frequency conversion link is not worked when ascending time slot.Therefore, reflected power signal feed-in feedback frequency conversion link 65 does not influence existing DPD (digital pre-distortion) function of closed-loop power control unit.
Another road is fed into the signal of power detection pipe 66; Also comprise the reflected power signal and the transmitting power signal that get into different sequential; These two kinds of signals are all carried out detection by power detection pipe 66 to be handled, and converts corresponding reflected voltage signal and emission voltage signal respectively to.Power detection pipe 66 preferred RMS power detection pipes 66 (root mean square also is called effective value for RMS, Root mean square), its cost is lower, complete function and dependable performance, and has than great dynamic range.
Reflected voltage signal and emission voltage signal by the converted analog format of power detection pipe 66; Further converted into the reflected voltage signal and emission voltage signal of number format accordingly, so that further calculate by the analog to digital converter that is provided with in the communication repeating device (ADC) 67.
In order to realize the aforementioned calculation function, a computing unit 68 is set in the communication repeating device, it adopts the special digital chip such as DSP, FPGA to realize.This computing unit 68 mainly is a reflected voltage signal of utilizing said number format and the emission voltage signal carries out computing to ask for the said standing-wave ratio with corresponding reflected power signal and the corresponding antenna port of transmitting power signal.
Well-known, confirmed the power of downlink signal and up reflected signal, can confirm the return loss of respective antenna port, and have corresponding relation between the standing wave ratio of return loss and antenna port.Therefore; In the present embodiment; The computational methods that computing unit 68 is used depend on the tables of data of an electronics, and this tables of data is confirmed when the communication repeating device dispatches from the factory in advance; Can reduce amount of calculation through look-up table, it has characterized the known standing wave ratio (VSWR) of each antenna port and the relation between the return loss (RL).As shown in table 1 below:
| VSWR | RL(dB) |
| 1.3 | 17.7 |
| 1.4 | 15.5 |
| 1.5 | 14.0 |
| 1.6 | 12.7 |
| 1.7 | 11.7 |
| 1.8 | 10.9 |
| 1.9 | 10.2 |
| 2 | 9.5 |
| 2.1 | 9.0 |
| 2.2 | 8.5 |
| 2.3 | 8.1 |
| 2.4 | 7.7 |
| 2.5 | 7.4 |
Table 1: preset return loss and the corresponding relation spreadsheet between the standing-wave ratio
The return loss (RL) and (P that transmits
In), reflected signal (P
Ref) between conversion Calculation relation please with reference to following formula:
RL(dB)＝P
indBm-P
refdBm (1)
It is thus clear that through type (1) is asked for (P that transmits of certain antenna port
In) and reflected signal (P
Ref) difference of the power that characterized separately, just can obtain the concrete numerical value of said return loss (RL).And in the through type (2), by the performance number P of RMS detection tube input
InCorresponding simulating magnitude of voltage V
Sample, gather the digital voltage value V that ADC quantizes by digital processing chip again
In, just set up the corresponding relation of digital voltage value and input power value.
Then; In order finally to obtain and the corresponding standing wave ratio of this return loss (RL) (VSWR); Through computing unit 68 default programs; The record at the return loss numerical value place that set return loss (RL) the numerical value difference that retrieval and last formula draw in table 1 is minimum then, is regarded as computing unit 68 determined standing-wave ratios with the corresponding standing wave ratio (VSWR) in this record.Thus, this, standing-wave ratio of line cap was able to confirm some day, can be used to do further processing, to solve the problem that such as the antenna port impedance coupling, is caused.
At needs a plurality of antenna ports are carried out standing-wave ratio when confirming, do not break away from the above-mentioned basic principle that the standing wave ratio of individual antenna port is confirmed, therefore, not all right giving unnecessary details.
This shows; Through installing time slot switch 63, power splitter 64, power detection pipe 66 and analog to digital converter 67 and computing unit 68 etc. in the down link of communication repeating device; In conjunction with ingenious utilization to transmitting with reflected signal; Confirm the standing wave ration detection device and the corresponding detecting method of the utility model, but science, confirmed the standing-wave ratio of any antenna port quickly and easily.Owing to adopted special-purpose computing unit 68; Do not rely on the existing chip of communication repeating device, thus the computation complexity of each chip can be reduced, thereby; This computing unit 68 can be realized by chips such as DSP with low cost, FGPA; Also just further practiced thrift the realization cost of the utility model, simultaneously, low complex degree can make the utility model more be applicable to broadband system.
The communication repeating device of the utility model adapts to the application of standing-wave ratio value detection device described in its down link, need do adaptive configuration to its up link.
Please continue to consult Fig. 1, in the up link of communication repeating device, be provided with balanced type LNA unit, being used for that upward signal is carried out low noise, to amplify continued up.
Said balanced type LNA unit comprises first electric bridge 32, second electric bridge 36 and is arranged at these two electric bridges 32, two output links that signal is amplified between 36.These two electric bridges all adopt the 3dB electric bridge.In each described output link, all be serially connected with amplitude limiter 33, RF switch 34 and 35, two output links of low noise amplifier and adopt identical structure, the existing balanced type design of historical facts or anecdotes according to the order of signal uplink.
Described first electric bridge 32.Both can be used for ascending time slot the reception of upward signal is amplified, and also can be used for the coupling of descending time slot to the reflection power of downstream signal, the degree of coupling of said reflection power is by the isolation decision of electric bridge isolated port.Through after said filter 2 filtering; Be divided into two-way; Wherein one the tunnel after circulator 5 detours, be transferred to this first electric bridge 32 another input port, then fixing or adjustable attenuator 31 carries out being transferred to after the gain-adjusted of 20dB an input port of said first electric bridge 32 through one on another road.First the electric bridge 32 and then upward signal of two branches input assigned to its two output ports forms described two output links thus.
Can know in conjunction with the attenuator that is provided with in said up link and the down link 62,31; Attenuator the 62, the 31st is for the power attenuation that adapts to circulator 5 is set up; Therefore, has certain corresponding relation between the electric parameter of the yield value of its decay and circulator 5.
In described each output link, at first, the upward signal that first electric bridge 32 distributes has been carried out amplitude limit by an amplitude limiter 33, and the signal that also promptly allows to be lower than a certain power magnitude passes through.Then, the upward signal that has passed through is through a RF switch 34, and this RF switch 34 is used for improving the isolation of upward signal transmitting power signal and reflected power signal, and making has reflected power signal to pass through in the upward signal, and filtering reflected power signal.By filtering the upward signal of reflected power signal undertaken after signal amplifies by a low noise amplifier 35 then, be fed into the input port of second electric bridge 36.
After closing the road, exports branch's upward signal that second electric bridge 36 inputs to its two input ports with two said output links; The load that one of two output ports of second electric bridge 36 coupling is 50 ohm; Another output port then is provided with another RF switch 38; Be used to realize time slot control, allow upward signal to pass through at ascending time slot.
Thus, the communication repeating device of the utility model had both been guaranteed not being mutually exclusive of upward signal and downstream signal, had further realized the function that standing wave ratio detects again, had realized the purpose of the utility model.
In sum, the utility model has been realized the detection of standing wave ratio with easy circuit and less cost, is particularly useful in the wide-band communication system.
Although the utility model only provides above embodiment; But; Those skilled in the art in conjunction with common practise, should be able to associate more embodiment after reading over this specification; But the spirit of the not unconventional the utility model claim of such embodiment any type ofly is equal to replacement or simple modification all should be regarded as by the included embodiment of the utility model.
Claims (9)
1. standing wave ration detection device is used to detect the standing-wave ratio of the antenna port of communication system, it is characterized in that it comprises:
Coupler, the transmitting power signal of exporting to this antenna port after the route closed-loop power control unit that is coupled amplifies;
The time slot switch is according to the reflected power signal of the corresponding up link of corresponding this antenna port of gating of the uplink and downlink time slot of this communication system, the transmitting power signal of said coupling;
Power splitter is all assigned to each power signal of time slot switch institute gating in the feedback frequency conversion link of power detection pipe and said closed-loop power control unit;
Said power detection pipe will pass through wherein each power signal and convert the correspondent voltage signal into;
Analog to digital converter converts said each voltage signal into number format from analog format;
Computing unit utilizes the reflected voltage signal that is number format to calculate the return loss of antenna port with the emission voltage signal, thereby confirms standing-wave ratio.
2. standing wave ration detection device according to claim 1 is characterized in that, is serially connected with attenuator between said coupler and the time slot switch, is used for the transmitting power signal of said coupling is carried out gain-adjusted.
3. standing wave ration detection device according to claim 1 is characterized in that, said power detection pipe is the RMS power detector.
4. according to any described standing wave ration detection device in the claim 1 to 3, it is characterized in that it is descending to this antenna port through circulator that said closed-loop power control unit amplifies the transmitting power signal of exporting the back.
5. standing wave ration detection device according to claim 4 is characterized in that said antenna port is connected to filter, to carry out filtering to the descending transmitting power signal of circulator with to the reflected power signal that antenna port is transferred to said time slot switch.
6. according to any described standing wave ration detection device in the claim 1 to 3, it is characterized in that said time slot switch is a RF switch.
7. a communication repeating device is characterized in that, it comprises like claim 4 or 5 described standing wave ration detection devices.
8. communication repeating device according to claim 7 is characterized in that, this communication repeating device also comprises: balanced type LNA unit is used for isolating and being given to up link after amplifying with low noise going the two-way branch of signal on the way.
9. communication repeating device according to claim 8 is characterized in that, said balanced type LNA unit comprises:
Attenuator is used for the reflected power signal of up link is carried out gain-adjusted;
First electric bridge will be shunted to two output links through the up signal of said circulator, and its isolated port forms said reflected power signal thus;
The amplitude limiter that is provided with in described each output link is used to prevent that said upward signal from surpassing preset power magnitude;
The RF switch that is provided with in described each output link is used for when transmission time slot improving the isolation of the transmitting power signal of upward signal reflected power signal and doping;
The low noise amplifier that is provided with in described each output link is used to amplify the upward signal after the said isolation;
Described second electric bridge, the upward signal after being used for two output links with said first circuit and amplifying close behind the road up.
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| CN102281113A (en) * | 2011-08-03 | 2011-12-14 | 京信通信系统（中国）有限公司 | Communication relay device and standing-wave ratio detection device and method thereof |
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| CN114002758A (en) * | 2021-11-05 | 2022-02-01 | 北京航天驭星科技有限公司 | Sonde transceiver |
| CN114002758B (en) * | 2021-11-05 | 2022-06-24 | 北京航天驭星科技有限公司 | Sonde transceiver |
| CN114567392A (en) * | 2022-03-10 | 2022-05-31 | 四川恒湾科技有限公司 | Radio remote unit uplink self-detection method |
| CN114567392B (en) * | 2022-03-10 | 2023-07-28 | 四川恒湾科技有限公司 | Uplink self-detection method for remote radio unit |
| CN114793098A (en) * | 2022-06-23 | 2022-07-26 | 成都世源频控技术股份有限公司 | Self-adaptive high-power amplitude limiting circuit with fast recovery |
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