CN202652250U - A network end signal sending device in TD-LTE system - Google Patents
A network end signal sending device in TD-LTE system Download PDFInfo
- Publication number
- CN202652250U CN202652250U CN 201220269810 CN201220269810U CN202652250U CN 202652250 U CN202652250 U CN 202652250U CN 201220269810 CN201220269810 CN 201220269810 CN 201220269810 U CN201220269810 U CN 201220269810U CN 202652250 U CN202652250 U CN 202652250U
- Authority
- CN
- China
- Prior art keywords
- unit
- output
- signal
- filtering
- mixing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Images
Landscapes
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
The utility model relates to a network end signal sending device in TD-LTE system. The network end signal sending device comprises a modulation carrier wave unit used for generating a TD-LTE modulation carrier wave signal. The output end of the modulation carrier wave unit is connected with the input end of a frequency mixing and filtering unit used for generating a RF radiofrequency signal, while the output end of the frequency mixing and filtering unit is connected with the input end of a switch filtering and amplifying unit. The output end of the switch filtering and amplifying unit is connected with the input end of a program-controlled attenuator unit through a fixed amplitude amplifying unit, while the output end of the program-controlled attenuator unit is connected with the input end of a multichannel output matching unit used for outputting multichannel LTE signals. Requirement of frequency range of a signal output can be satisfied by repeated frequency conversion. Requirement of Low stray of an output signal is satisfied by using the switch filtering and amplifying unit and filtering after frequency mixture. A fixed amplitude loop satisfies a high-accuracy requirement of the signal output power, while the multi-stage amplification satisfies maximum-power requirement of the signal output. Requirements of low-power stepping and large dynamic range are achieved by combination of the fixed amplitude amplifying unit and the program-controlled attenuator.
Description
Technical field
The utility model relates to TD-LTE system field, the network terminal sender unit of especially a kind of TD-LTE system.
Background technology
The test of TD-LTE terminal radio frequency consistency is one of very crucial uniformity test of the communications industry, at 3GPP standard, TD-LTE national sector standard strict regulation is arranged, wherein network terminal transmits and plays very important effect at the aspects such as Comprehensive Designing checking, terminal equipment research and development, design verification, production and radio frequency impairments location of base station.China requires the power bracket of the TD-LTE signal of TD-LTE terminal radio frequency consistency testing equipment output to be: 0dBm～-120dBm, power accuracy is: 0.8dB, signal bandwidth is greater than 20MHz, therefore, the TD-LTE signal that how to produce low noise, low spuious, great dynamic range, multichannel becomes the research forward position of TD-LTE terminal radio frequency consistency field tests.
The method of existing radio frequency transmissions has a variety of, for the emission of LTE grid end also seldom, major part is all launched for normal signal, common RF transmission method is only for continuous signal, it is the large dynamic burst signal of a wide inromation bandwidth, high peak-to-average force ratio that the LTE network terminal transmits, and utilizes common launching technique can cause the unstable and normal phenomenon such as demodulation of distortion, the power of signal.
The utility model content
The purpose of this utility model is to provide a kind of network terminal sender unit that can produce the TD-LTE system of low noise, low spuious, great dynamic range, multichannel TD-LTE signal.
For achieving the above object, the utility model has adopted following technical scheme: the network terminal sender unit of a kind of TD-LTE system, comprise the modulated carrier unit for generation of the TD-LTE modulated carrier signal, the output of modulated carrier unit links to each other with input for generation of the mixing and filtering unit of RF radiofrequency signal, the output of mixing and filtering unit links to each other with the input of switch filtering amplifying unit, the output of switch filtering amplifying unit links to each other with the input of programmable attenuator unit by the fixed ampllitude amplifying unit, and the output of programmable attenuator unit links to each other with the input of the multichannel output matching unit that is used for output multi-channel LTE signal.
As shown from the above technical solution, repeatedly frequency conversion of the present utility model can be satisfied the frequency range requirement of signal output; Utilize filtering after switch filter and the mixing, satisfy the low spuious requirement of output signal, the fixed ampllitude loop satisfies the high accuracy requirement of output power signal, the requirement of the maximum power of signal output is satisfied in multipole amplification, realizes the requirement of small-power stepping, great dynamic range by the combination of fixed ampllitude amplifying unit and programmable attenuator unit.The utility model has improved precision and the signal quality of TD-LTE terminal radio frequency consistency testing equipment TD-LTE signal output effectively, and simultaneously, the utility model also has good effect to the signal emission of other various communication systems, has stronger versatility.
Description of drawings
Fig. 1 is system principle diagram of the present utility model;
Fig. 2 is the time-domain diagram of signal emission of the present utility model;
Fig. 3 is the frequency domain figure of signal emission of the present utility model;
Fig. 4 is the Vector Modulation figure of signal emission of the present utility model.
Embodiment
The network terminal sender unit of a kind of TD-LTE system, comprise the modulated carrier unit 1 for generation of the TD-LTE modulated carrier signal, the output of modulated carrier unit 1 links to each other with input for generation of the mixing and filtering unit 2 of RF radiofrequency signal, the output of mixing and filtering unit 2 links to each other with the input of switch filtering amplifying unit 3, the output of switch filtering amplifying unit 3 links to each other with the input of programmable attenuator unit 5 by fixed ampllitude amplifying unit 4, the output of programmable attenuator unit 5 links to each other with the input of the multichannel output matching unit 6 that is used for output multi-channel LTE signal, as shown in Figure 1.
As shown in Figure 1, described mixing and filtering unit 2 comprises the first mixing and filtering unit, the output of modulated carrier unit 1, spot-frequency local oscillation unit all links to each other with the input of the first mixing and filtering unit, the output of the first mixing and filtering unit, narrow-band local oscillation unit all links to each other with the input of the second mixing and filtering unit, the output of the second mixing and filtering unit, broadband local oscillator unit all links to each other with the input of the 3rd mixing and filtering unit, and the output of the 3rd mixing and filtering unit links to each other with the input of switch filtering amplifying unit 3.The utility model also comprises control unit 7, and its output links to each other with the input of switch filtering amplifying unit 3, broadband local oscillator unit respectively.
The frequency range of described RF radiofrequency signal is that 1800～2700MHz, power are-20dBm.The frequency of described TD-LTE modulated carrier signal is that 30.72MHz, power are-10dBm.
Below in conjunction with Fig. 1 the utility model is further described.
According to the terminal test demand, 1 produces the LTE modulated carrier signal in the modulated carrier unit, and the signal frequency of modulated carrier signal is 30.72MHz, and power is-10dBm;
According to the terminal test demand, the spot-frequency local oscillation unit produces the spot-frequency local oscillation signal of 500MHz, the first mixing and filtering unit is with the LTE modulated carrier signal of modulated carrier unit generation and the spot-frequency local oscillation signal mixing of spot-frequency local oscillation unit generation, the first mixing and filtering unit produces the first intermediate-freuqncy signal, the first intermediate-freuqncy signal frequency is 469.28MHz, the TD-LTE signal of this moment output is fixing frequency, and signal bandwidth is narrow, only has 20MHz, carry out filtering after the mixing and be in order to leach spot-frequency local oscillation and modulated carrier signal mixed product, the power output of the first intermediate-freuqncy signal is-8dBm;
The second mixing and filtering unit carries out mixing with the narrow-band local oscillation signal that the first intermediate-freuqncy signal and narrow-band local oscillation unit produce, and point-frequency signal is converted to the second intermediate-freuqncy signal of changeable frequency, and the power output of the second intermediate-freuqncy signal is-10dBm;
The 3rd mixing and filtering unit carries out mixing with the broadband local oscillator signal of the second intermediate-freuqncy signal and the generation of broadband local oscillator unit, be suitable for the narrowband intermediate frequency signal frequency conversion on the RF radiofrequency signal of TD-LTE system to frequency, the frequency range of RF radiofrequency signal is 1800～2700MHz, and power is-20dBm;
Broadband local oscillator signal and the second intermediate-freuqncy signal are converted to the RF signal, because it is much spuious that local oscillator is that broadband signal can produce, the spuious variation with the broadband local oscillator frequency that forms changes, can't leach with fixed filters, so rear end output needs the switch filter of switch filtering amplifying unit 3, the switch filter of switch filtering amplifying unit 3 with front end the first mixing and filtering unit, the second mixing and filtering unit, the 3rd mixing and filtering unit can guarantee the RF radiofrequency signal spuious at-60dBc;
Behind switch filtering amplifying unit 3, the RF radiofrequency signal is through fixed ampllitude amplifying unit 4, can the output of LTE signal be remained unchanged by feedback control loop during the fluctuation of LTE signal power, fixed ampllitude amplifying unit 4 has individual amplifying element, amplify the output signal of LTE, the maximum power 0dBm of demand output when satisfying terminal test;
The main path signal of unit entered programmable attenuator unit 5 after fixed ampllitude amplifying unit 4 amplified, and adjusted the attenuation of signal according to the terminal test demand, thereby had the 120dB great dynamic range so that the TD-LTE signal is finally exported;
Multichannel output matching unit 6, inner power splitter and mechanical switch by the microstrip line form forms, and can guarantee that signal at the differential loss 4dB of multichannel output matching unit 6, is matched to 2 road homogenous frequency signals to output signal by one the tunnel.
Fig. 2 is the time-domain diagram of signal of the present utility model emission, and what provide is that the centre frequency that transmits is 2.4GHz, and be 10ms sweep time, and 10ms is a frame data length, the subframe performance number of test.
Fig. 3 is the frequency domain figure of signal of the present utility model emission, and what provide is that the centre frequency that transmits is 2.4GHz,, occupied bandwidth (20MHz) spectrogram of test TD-LTE.
Fig. 4 is the Vector Modulation figure of signal emission of the present utility model, and its A district is the planisphere that transmits under the OFDM modulation format; The spectrogram of its B district for transmitting; Its C district is error vector magnitude analysis chart corresponding to each subcarrier; Its D district is TD-LTE vector signal demodulation performance achievement data Statistical Area; Its E district is error vector magnitude analysis chart corresponding to each OFDM symbol; The EVM value that its F district is each channel of TD-LTE and with respect to RS performance number Statistical Area.
The LTE signal of the utility model output satisfies " verification method of TD-LTE terminal radio frequency consistency testing equipment " to the requirement of TD-LTE terminal radio frequency consistency testing equipment, this device guarantees the maximum power of signal output by switch filtering amplifying unit 3, guarantee the dynamic range of signal output by programmable attenuator unit 5, satisfy the pinpoint accuracy of high peak-to-average force ratio burst signal power test by fixed ampllitude amplifying unit 4, by first, two, three mixing and filtering cell power arrange accurately, guarantee that high peak-to-average force ratio burst signal does not compress, satisfy the multiple signals output of signal by multichannel output matching unit 6.
Claims (5)
1. the network terminal sender unit of a TD-LTE system, it is characterized in that: comprise the modulated carrier unit (1) for generation of the TD-LTE modulated carrier signal, the output of modulated carrier unit (1) links to each other with input for generation of the mixing and filtering unit (2) of RF radiofrequency signal, the output of mixing and filtering unit (2) links to each other with the input of switch filtering amplifying unit (3), the output of switch filtering amplifying unit (3) links to each other with the input of programmable attenuator unit (5) by fixed ampllitude amplifying unit (4), and the output of programmable attenuator unit (5) links to each other with the input of the multichannel output matching unit (6) that is used for output multi-channel LTE signal.
2. the network terminal sender unit of TD-LTE according to claim 1 system, it is characterized in that: described mixing and filtering unit (2) comprises the first mixing and filtering unit, modulated carrier unit (1), the output of spot-frequency local oscillation unit all links to each other with the input of the first mixing and filtering unit, the first mixing and filtering unit, the output of narrow-band local oscillation unit all links to each other with the input of the second mixing and filtering unit, the second mixing and filtering unit, the output of broadband local oscillator unit all links to each other with the input of the 3rd mixing and filtering unit, and the output of the 3rd mixing and filtering unit links to each other with the input of switch filtering amplifying unit (3).
3. the network terminal sender unit of TD-LTE according to claim 2 system, it is characterized in that: also comprise control unit (7), its output links to each other with the input of switch filtering amplifying unit (3), broadband local oscillator unit respectively.
4. the network terminal sender unit of TD-LTE according to claim 1 system is characterized in that: to be 30.72MHz, power be-10dBm to the frequency of described TD-LTE modulated carrier signal.
5. the network terminal sender unit of TD-LTE according to claim 1 system is characterized in that: to be 1800～2700MHz, power be-20dBm to the frequency range of described RF radiofrequency signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220269810 CN202652250U (en) | 2012-06-09 | 2012-06-09 | A network end signal sending device in TD-LTE system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220269810 CN202652250U (en) | 2012-06-09 | 2012-06-09 | A network end signal sending device in TD-LTE system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202652250U true CN202652250U (en) | 2013-01-02 |
Family
ID=47421275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220269810 Withdrawn - After Issue CN202652250U (en) | 2012-06-09 | 2012-06-09 | A network end signal sending device in TD-LTE system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202652250U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684714A (en) * | 2012-06-09 | 2012-09-19 | 中国电子科技集团公司第四十一研究所 | Network end signal emitting device of time division-long term evolution (TD-LTE) system |
-
2012
- 2012-06-09 CN CN 201220269810 patent/CN202652250U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684714A (en) * | 2012-06-09 | 2012-09-19 | 中国电子科技集团公司第四十一研究所 | Network end signal emitting device of time division-long term evolution (TD-LTE) system |
| CN102684714B (en) * | 2012-06-09 | 2014-04-30 | 中国电子科技集团公司第四十一研究所 | Network end signal emitting device of time division-long term evolution (TD-LTE) system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102684714B (en) | Network end signal emitting device of time division-long term evolution (TD-LTE) system | |
| CN104301047B (en) | A kind of power self-calibration device and method of multimode multi-frequency multi-channel system | |
| CN201966902U (en) | Multi-channel radio frequency circuit with high consistency | |
| CN103888085B (en) | Method of calibrating an envelope tracking system, power voltage modulation method and apparatus thereof | |
| CN101515809B (en) | Method and device for reducing reference signal CM in carrier wave polymerization scene | |
| CN104009765B (en) | A kind of high-performance LTE channel simulator radio frequency sending set | |
| CN102457458B (en) | The implementation method of a kind of base station digital pre-distortion and device | |
| CN102412855B (en) | Determination method of impedance match situation and equipment | |
| CN204103932U (en) | Phase amplitude-matched multi-channel radio frequency simulator | |
| CN108134583B (en) | Error negative feedback type linear power amplification device and method | |
| Nopchinda et al. | Emulation of array coupling influence on RF power amplifiers in a measurement setup | |
| CN109217884B (en) | Transmitting channel device supporting standard communication system signals | |
| CN103327600A (en) | Automatic control device and method of radio frequency link gains | |
| CN202652250U (en) | A network end signal sending device in TD-LTE system | |
| CN201323586Y (en) | Passive intermodulation testing system | |
| CN204721339U (en) | A kind of signal receiving device of eight passage multimode systems | |
| CN102724153B (en) | DPD (digital pre-distortion) based far end machine and repeater system | |
| CN104580043A (en) | Digital pre-distortion system and method thereof | |
| CN201690414U (en) | Transceiving channel device for KA frequency converter | |
| CN203984364U (en) | There is synchronization and control AGC and the ALC high-gain active circuit assembly of function | |
| CN113572542B (en) | High-precision standing-wave ratio detection device for remote radio unit | |
| CN105116413A (en) | High-speed parallel acquisition system clock synchronization device | |
| CN202978916U (en) | Eight-channel TR assembly | |
| CN204013488U (en) | Eight channel widths are mobile network signals transmitter module frequently | |
| CN111082817B (en) | Phase compensation method and system for improving linearity |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130102 Effective date of abandoning: 20140430 |
|
| RGAV | Abandon patent right to avoid regrant |