CN102684714A - Network end signal emitting device of time division-long term evolution (TD-LTE) system - Google Patents
Network end signal emitting device of time division-long term evolution (TD-LTE) system Download PDFInfo
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- CN102684714A CN102684714A CN2012101882043A CN201210188204A CN102684714A CN 102684714 A CN102684714 A CN 102684714A CN 2012101882043 A CN2012101882043 A CN 2012101882043A CN 201210188204 A CN201210188204 A CN 201210188204A CN 102684714 A CN102684714 A CN 102684714A
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Abstract
The invention relates to a network end signal emitting device of a time division-long term evolution (TD-LTE) system. The network end signal emitting device comprises a modulation carrier wave unit used for generating TD-LTE modulation carrier wave signals, wherein the output end of the modulation carrier wave unit is connected with the input end of a frequency mixing filtering unit used for generating radio frequency (RF) signals, the output end of the frequency mixing filtering unit is connected with the input end of a switch filtering amplification unit, the output end of the switch filtering amplification unit is connected with the input end of a program control attenuator unit through a fixed amplitude amplifying unit, and the output end of the program control attenuator unit is connected with the input end of a multi-path output matching unit used for outputting multiple paths of LTE signals. The multi-time frequency conversion can meet the output frequency range requirement of the signal output, the switch filter and the frequency fixing filtering are utilized, the low stray requirements of output signals are met, high-accuracy requirements of the signal output power can be met through a fixed amplitude loop, the signal output maximum power requirement is met through multi-stage amplification, and the low-power step and large-dynamic-range requirements are realized through the combination of the fixed amplitude amplification unit and the program control attenuator.
Description
Technical field
The present invention 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; Strict regulation is arranged on 3GPP standard, TD-LTE national sector standard, and wherein network terminal transmits and plays important effect at the aspects such as comprehensive design verification, 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; To the emission of LTE grid end also seldom; Major part all is to launch to normal signal; Common RF transmission method is only to continuous signal, and it is the big 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.
Summary of the invention
The object of the present invention 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 realizing above-mentioned purpose; The present invention has adopted following technical scheme: the network terminal sender unit of a kind of TD-LTE system; Comprise the modulated carrier unit that is used to produce the TD-LTE modulated carrier signal; The output of modulated carrier unit links to each other with the input of the mixing and filtering unit that is used to produce the RF radiofrequency signal; The output of mixing and filtering unit links to each other with the input of switch filtering amplifying unit, and the output of switch filtering amplifying unit links to each other with the input of programmable attenuator unit through the fixed ampllitude amplifying unit, and the output of programmable attenuator unit links to each other with the input that the multichannel that is used to export multichannel LTE signal is exported matching unit.
Can know that by technique scheme repeatedly frequency conversion of the present invention 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 through the combination of fixed ampllitude amplifying unit and programmable attenuator unit.The present invention has improved the precision and the signal quality of TD-LTE terminal radio frequency consistency testing equipment TD-LTE signal output effectively, and simultaneously, the present invention also has good effect to the signal emission of other various communication systems, has stronger versatility.
Description of drawings
Fig. 1 is a system principle diagram of the present invention;
Fig. 2 is the time-domain diagram of signal emission of the present invention;
Fig. 3 is the frequency domain figure of signal emission of the present invention;
Fig. 4 is the Vector Modulation figure of signal emission of the present invention.
Embodiment
The network terminal sender unit of a kind of TD-LTE system; Comprise the modulated carrier unit 1 that is used to produce the TD-LTE modulated carrier signal; The output of modulated carrier unit 1 links to each other with the input of the mixing and filtering unit 2 that is used to produce the 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 through fixed ampllitude amplifying unit 4, and the output of programmable attenuator unit 5 links to each other with the input that the multichannel that is used to export multichannel LTE signal is exported matching unit 6, and is 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, local oscillator unit, broadband 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 present invention also comprises control unit 7, and its output links to each other with the input of switch filtering amplifying unit 3, local oscillator unit, broadband 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 present invention 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, and 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, and the first mixing and filtering unit produces 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, has only 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 first intermediate-freuqncy signal is-8dBm;
The second mixing and filtering unit carries out mixing with the narrow-band local oscillation signal that first intermediate-freuqncy signal and narrow-band local oscillation unit produce, and point-frequency signal is converted to second intermediate-freuqncy signal of changeable frequency, and the power output of second intermediate-freuqncy signal is-10dBm;
The 3rd mixing and filtering unit carries out mixing with the broadband local oscillation signal of second intermediate-freuqncy signal and the generation of local oscillator unit, broadband; 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;
The broadband local oscillation signal and 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 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 the front end 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 through feedback control loop during the fluctuation of LTE signal power; Fixed ampllitude amplifying unit 4 has individual amplifying element, amplifies the output signal of LTE, the maximum power 0dBm of demand output when satisfying terminal test;
The main path signal that fixed ampllitude amplifying unit 4 amplifies the unit, back gets into programmable attenuator unit 5, according to the attenuation of terminal test demand adjustment signal, thereby makes the final output of TD-LTE signal have the 120dB great dynamic range;
Multichannel output matching unit 6, inside is made up of the power splitter and the mechanical switch of microstrip line form, can guarantee the differential loss 4dB of signal at multichannel output matching unit 6, is matched to 2 road homogenous frequency signals to the output signal by one the tunnel.
Fig. 2 is the time-domain diagram of signal of the present invention 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 invention 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 invention, 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 the corresponding vector error amplitude analysis chart of each subcarrier; Its D district is TD-LTE vector signal demodulation performance achievement data statistics district; Its E district is the corresponding vector error amplitude analysis chart of each OFDM symbol; The EVM value that its F district is each channel of TD-LTE and with respect to RS performance number statistics district.
The LTE signal of the present invention's output satisfies " verification method of TD-LTE terminal radio frequency consistency testing equipment " requirement to TD-LTE terminal radio frequency consistency testing equipment; This device guarantees the maximum power of signal output through switch filtering amplifying unit 3; Guarantee the dynamic range of signal output through programmable attenuator unit 5; Satisfy the pinpoint accuracy of high peak-to-average force ratio burst signal power test through fixed ampllitude amplifying unit 4; Be provided with accurately through first, second and third mixing and filtering cell power, guarantee that high peak-to-average force ratio burst signal does not compress, satisfy the multiple signals output of signal through 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) that is used to produce the TD-LTE modulated carrier signal; The output of modulated carrier unit (1) links to each other with the input of the mixing and filtering unit (2) that is used to produce the 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) through fixed ampllitude amplifying unit (4), and the output of programmable attenuator unit (5) links to each other with the input that the multichannel that is used to export multichannel LTE signal is exported matching unit (6).
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; 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, local oscillator unit, broadband 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), local oscillator unit, broadband 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.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103595684A (en) * | 2013-11-26 | 2014-02-19 | 中国电子科技集团公司第四十一研究所 | Discontinuous carrier aggregation LTE-advanced signal analysis method and device |
| CN103986495A (en) * | 2014-06-06 | 2014-08-13 | 成都福兰特电子技术有限公司 | Novel signal transmitting device of TD-LTE (Time Division Long Term Evolution) system |
| CN104184490A (en) * | 2014-09-13 | 2014-12-03 | 中国电子科技集团公司第四十一研究所 | FDD-LTE terminal signal transmitting device |
| CN109217884A (en) * | 2018-10-17 | 2019-01-15 | 中国电子科技集团公司第四十研究所 | A kind of transmission channel device for supporting standard traffic standard signal |
| CN109302241A (en) * | 2017-12-12 | 2019-02-01 | 上海创远仪器技术股份有限公司 | A kind of vector signal generation device and method based on chip |
| CN109560794A (en) * | 2018-11-09 | 2019-04-02 | 南京邮电大学 | Vector Modulation radio-frequency signal generator |
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| CN102457297A (en) * | 2010-10-19 | 2012-05-16 | 中国科学院微电子研究所 | Wireless transceiver |
| CN202652250U (en) * | 2012-06-09 | 2013-01-02 | 中国电子科技集团公司第四十一研究所 | A network end signal sending device in TD-LTE system |
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| CN102130697A (en) * | 2010-01-20 | 2011-07-20 | 华为技术有限公司 | Receiver, transmitter and feedback device, transceiver and signal processing method |
| CN102457297A (en) * | 2010-10-19 | 2012-05-16 | 中国科学院微电子研究所 | Wireless transceiver |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103595684A (en) * | 2013-11-26 | 2014-02-19 | 中国电子科技集团公司第四十一研究所 | Discontinuous carrier aggregation LTE-advanced signal analysis method and device |
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| CN109302241A (en) * | 2017-12-12 | 2019-02-01 | 上海创远仪器技术股份有限公司 | A kind of vector signal generation device and method based on chip |
| CN109302241B (en) * | 2017-12-12 | 2023-12-01 | 上海创远仪器技术股份有限公司 | Chip-based vector signal generating device and method |
| CN109217884A (en) * | 2018-10-17 | 2019-01-15 | 中国电子科技集团公司第四十研究所 | A kind of transmission channel device for supporting standard traffic standard signal |
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| CN109560794B (en) * | 2018-11-09 | 2022-10-28 | 南京邮电大学 | Vector modulation radio frequency signal generator |
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Effective date of registration: 20190314 Address after: 266000 No. 98 Xiangjiang Road, Huangdao District, Qingdao City, Shandong Province Patentee after: China Electronics Technology Instrument and Meter Co., Ltd. Address before: 233006 Mailbox 101, 726 Zhengzheng Road, Bengbu City, Anhui Province Patentee before: The 41st Institute of CETC |
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