CN106130573B - The pilot signal method for generation of NB-IoT pilot signal generating device - Google Patents
The pilot signal method for generation of NB-IoT pilot signal generating device Download PDFInfo
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- H—ELECTRICITY
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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- H—ELECTRICITY
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- H04B—TRANSMISSION
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Abstract
The present invention relates to Internet of Things fields of communication technology, and in particular to arrives NB-IoT pilot signal generating device and its pilot signal method for generation, it is characterised in that: the output end that NB-IoT pilot tone base band generates unit is connected with intermediate frequency control unit input terminal；One input terminal of the output end connection frequency mixer of intermediate frequency control unit, another input terminal of frequency mixer connects the output end of the first local oscillator unit, the output end of frequency mixer connects an input terminal of another frequency mixer, another input terminal of another frequency mixer is connected with the second local oscillator unit exports radiofrequency signal；The output end of another frequency mixer is sequentially connected controllable filter unit input terminal, gain conditioning unit input terminal, fixed gain amplifying unit input terminal, and the output end of fixed gain amplifying unit exports high-power RF signal.Compared with prior art, the present invention meeting the frequency coverage of NB-IoT signal by the multistage frequency conversion of radio-frequency channel.
Description
Technical Field
The invention relates to the technical field of communication of the Internet of things, in particular to an NB-IoT pilot signal generation device and a pilot signal generation method thereof.
Background
The market potential of the Internet of things is huge, and large-scale blowout type development is about to be achieved. At present, the mass consumption market is saturated day by day, so that the profit growth of operators is slowed, a new profit growth point is urgently needed to be searched, and according to the report prediction of various institutions such as McKensin and the like, the connection number of the Internet of things and the market scale will be developed in a large-scale blowout manner in the future 5-10 years. The interconnection of everything has become an important strategic direction for the active layout of global operators, scientific and technical enterprises and industrial alliances. Cellular networks currently cover 90% of the global population, covering over 50% of geographic locations. Based on existing cellular networks, operators can provide a very competitive technology of internet of things, namely NB-IoT. The NB-IoT has optimal performance in the aspects of coverage, power consumption, cost, connection number and the like, and best meets the LPWA type service requirements.
Testing is an important link in the wireless communication industry chain, and for a long time, testing instruments and meters are always bottlenecks which restrict the development of the communication industry in China. In the aspect of test equipment, China is almost blank, and test instruments are basically monopolized by Keysight corporation, R/S corporation and the like. The NB-IoT industry is in an accelerated development stage, but in the development process of the industry, the test meter still lags behind the development of other devices and systems, the NB-IoT test meter which can be seen in the market at present is difficult to see, and device and system manufacturers are built through various meter combinations at present, so that the NB-IoT meter which promotes the development of the NB-IoT technology is yet to be developed. The NB-IoT (R13) standard formulation work has frozen today, but NB-IoT has yet to be commercially successful, requiring early testing solutions that are synchronized with standard development, presenting even greater challenges to the measurement instrumentation. It is therefore very urgent to develop an NB-IoT pilot signal generation meter.
Disclosure of Invention
The invention aims to provide an NB-IoT pilot signal generating device and a pilot signal generating method thereof, which are convenient for early test during development.
To achieve the above object, the present invention provides an NB-IoT pilot signal generating apparatus, comprising: the device comprises an NB-IoT pilot frequency baseband generation unit for generating an NB-IoT pilot frequency signal baseband, wherein the output end of the NB-IoT pilot frequency baseband generation unit is connected with the input end of an intermediate frequency control unit for interpolation frequency conversion and digital-to-analog conversion; the output end of the intermediate frequency control unit is connected with one input end of the frequency mixer, the other input end of the frequency mixer is connected with the output end of the first local oscillation unit, the output end of the frequency mixer is connected with one input end of the other frequency mixer, and the other input end of the other frequency mixer is connected with the second local oscillation unit to output radio frequency signals; the output end of the other mixer is sequentially connected with the input end of the controllable filtering unit, the input end of the gain conditioning unit for adjusting the channel gain and the input end of the fixed gain amplifying unit for amplifying the high power, and the output end of the fixed gain amplifying unit outputs the high power radio frequency signal.
The intermediate frequency carrier frequency output by the intermediate frequency control unit is 35MHz, and the intermediate frequency output power is-5 dBm.
The first local oscillator unit outputs dot frequency, the output frequency is fixed at 435MHz, and the output power range is-20 dBm-0 dBm.
The radio frequency output frequency of the radio frequency signal output by the second local oscillator unit is 700 MHz-2800 MHz, and the radio frequency output range is-20 dBm- +45dBm, and is used for frequency coverage of NB-IoT pilot signals and other communication system pilot signals.
A pilot signal generation method of an NB-IoT pilot signal generation apparatus, characterized in that: generating a baseband signal comprising a narrowband primary synchronization signal NPSS, a narrowband secondary synchronization signal NSSS and a narrowband reference signal; the generation of the baseband signals of the narrowband primary synchronization signal NPSS, the narrowband secondary synchronization signal NSSS and the narrowband reference signal NRS comprises the following steps:
(1) generating a narrowband primary synchronization signal NPSS signal, wherein the narrowband primary synchronization signal is mapped on 1 st to 11 th sub-carriers of a 6 th sub-frame of each radio frame of an NB-IoT carrier, and the generation formula is as follows according to a 3GPP protocol:
(2) generating a narrowband auxiliary synchronization signal NSSS signal, wherein the narrowband auxiliary synchronization signal is mapped on all 12 subcarriers of the last 11 symbols on the 10 th subframe of every other radio frame of an NB-IoT carrier, and the generation formula is as follows according to a 3GPP protocol:
wherein,n _ Cell _ ID is a Cell ID number;
(3) generating a narrowband reference signal NRS signal, mapping the narrowband reference signal on the last two symbols of all downlink subframes of the NB-IoT carrier except for mapping NPSS and NSSS, wherein the starting position is the correlation of an antenna port number and an NB-IoT cell ID number, and the generation formula is as follows:
wherein:
nsis the time slot number, l is the symbol number,is NB-IoT cell number, NCPIs 1;
(4) carrying out 2048-point IFFT on the data subjected to resource mapping for OFDM modulation, wherein the formula of the OFDM modulation is as follows:
and inserting the OFDM modulated symbols into a CP with the length of 160 symbols in a symbol 0 of one time slot, and inserting other symbols into a CP with the length of 144 symbols to form one or more wireless frame data with the symbol rate of 30.72 Mbs.
Compared with the prior art, the frequency coverage range of NB-IoT signals is met through the multi-stage frequency conversion of the radio frequency channel, the performance of high phase noise and low stray is realized through adjustable tracking filtering, the large-range coverage requirement of the NB-IoT pilot signals is met through adjustable channel gain and fixed gain amplification, the narrowband main synchronizing signal, the narrowband auxiliary synchronizing signal and the baseband signal of the narrowband reference signal are generated, and the search requirement of the NB-IoT terminal on the base station pilot signal and the calibration requirement of a terminal receiver are met; under the condition of high-power amplification, the signal output quality is effectively improved, and meanwhile, the frequency coverage covers 700 MHz-2800 MHz except 800 MHz-1990 MHz used for NB-IoT, so that a hardware space is provided for other communication systems.
Drawings
Fig. 1 is a schematic block diagram of a circuit in an embodiment of the invention.
Fig. 2 is a time-frequency distribution diagram of NB-IoT narrowband reference signals in the present invention.
Fig. 3 is a time domain diagram of NB-IoT pilot signal transmission in the present invention.
Fig. 4 is a frequency domain diagram of NB-IoT pilot signal transmission in the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying drawings.
Example 1
As shown in fig. 1, an NB-IoT pilot signal generating apparatus includes an NB-IoT pilot baseband generating unit for generating an NB-IoT pilot signal baseband, wherein an output end of the NB-IoT pilot baseband generating unit is connected to an input end of an intermediate frequency control unit for interpolation frequency conversion and digital-to-analog conversion; the output end of the intermediate frequency control unit is connected with one input end of the frequency mixer 1, the other input end of the frequency mixer 1 is connected with the output end of the first local oscillation unit, the output end of the frequency mixer 1 is connected with one input end of the other frequency mixer 2, and the other input end of the other frequency mixer 2 is connected with the second local oscillation unit to output radio frequency signals; the output end of the other mixer 2 is sequentially connected with the input end of the controllable filtering unit, the input end of the gain conditioning unit for adjusting the channel gain and the input end of the fixed gain amplifying unit for amplifying the high power, and the output end of the fixed gain amplifying unit outputs the high power radio frequency signal.
Further, the intermediate frequency carrier frequency output by the intermediate frequency control unit is 35MHz, and the intermediate frequency output power is-5 dBm.
Further, the first local oscillation unit outputs dot frequency, the output frequency is fixed at 435MHz, and the output power range is-20 dBm-0 dBm.
Further, the radio frequency output frequency of the radio frequency signal output by the second local oscillation unit is 700 MHz-2800 MHz, and is used for frequency coverage of NB-IoT pilot signals and other communication system pilot signal emission, and the power output range is-20 dBm- +45 dBm.
Example 2
The present embodiment is a pilot signal generation method based on the generation apparatus described in embodiment 1, characterized in that:
generating a baseband signal comprising a narrowband primary synchronization signal NPSS, a narrowband secondary synchronization signal NSSS and a narrowband reference signal; the generation of the baseband signals of the narrowband primary synchronization signal NPSS, the narrowband secondary synchronization signal NSSS and the narrowband reference signal NRS comprises the following steps:
(1) generating a narrowband primary synchronization signal NPSS signal, wherein the narrowband primary synchronization signal is mapped on 1 st to 11 th sub-carriers of a 6 th sub-frame of each radio frame of an NB-IoT carrier, and the generation formula is as follows according to a 3GPP protocol:
(2) generating a narrowband auxiliary synchronization signal NSSS signal, wherein the narrowband auxiliary synchronization signal is mapped on all 12 subcarriers of the last 11 symbols on the 10 th subframe of every other radio frame of an NB-IoT carrier, and the generation formula is as follows according to a 3GPP protocol:
wherein,n _ Cell _ ID is a Cell ID number.
(3) Generating a Narrowband Reference Signal (NRS), mapping the narrowband reference signal on the last two symbols of all downlink subframes of the NB-IoT carrier except for mapping the NPSS and the NSSS, wherein the starting position is related to an antenna port number and an NB-IoT cell ID number, and referring to FIG. 2, the generation formula is as follows:
wherein:
nsis the time slot number, l is the symbol number,is NB-IoT cell number, NCPIs 1.
(4) Carrying out 2048-point IFFT on the data subjected to resource mapping for OFDM modulation, wherein the formula of the OFDM modulation is as follows:
and inserting the OFDM modulated symbols into a CP with the length of 160 symbols in a symbol 0 of one time slot, and inserting other symbols into a CP with the length of 144 symbols to form one or more wireless frame data with the symbol rate of 30.72 Mbs.
As shown in FIG. 3, the time domain diagram of NB-IoT pilot signal transmission is shown, the center frequency is 1950MHz, the scanning time is one radio frame (10ms), the subframe symbol distribution of NB-IoT and the time domain signal power are tested.
As shown in fig. 4, the frequency domain diagram of NB-IoT pilot signal transmission of the present invention is centered at 1950MHz, the sweep width is 1MHz, and the NB-IoT channel bandwidth distribution is tested.
In summary, the present invention satisfies the frequency coverage of NB-IoT signals through multi-stage frequency conversion of radio frequency channels, achieves high phase noise and low spurious performance through adjustable tracking filtering, satisfies the wide-range coverage requirement of NB-IoT pilot signals through adjustable channel gain and fixed gain amplification, generates narrowband primary synchronization signals, narrowband secondary synchronization signals, and baseband signals of narrowband reference signals, and satisfies the search requirement of NB-IoT terminals on base station pilot signals and the calibration requirement of terminal receivers. The invention effectively improves the signal output quality under the condition of high-power amplification, and simultaneously frequency coverage provides hardware space for other communication systems.
Claims (4)
1. A pilot signal generation method of an NB-IoT pilot signal generation apparatus, characterized in that: the NB-IoT pilot signal generating device comprises an NB-IoT pilot signal baseband generating unit used for generating NB-IoT pilot signal baseband, and the output end of the NB-IoT pilot signal baseband generating unit is connected with the input end of an intermediate frequency control unit used for interpolation frequency conversion and digital-to-analog conversion; the output end of the intermediate frequency control unit is connected with one input end of a mixer (1), the other input end of the mixer (1) is connected with the output end of a first local oscillation unit, the output end of the mixer (1) is connected with one input end of another mixer (2), and the other input end of the another mixer (2) is connected with a second local oscillation unit to output radio frequency signals; the output end of the other mixer (2) is sequentially connected with the input end of the controllable filtering unit, the input end of the gain conditioning unit for adjusting the channel gain and the input end of the fixed gain amplifying unit for amplifying the high power, and the output end of the fixed gain amplifying unit outputs a high power radio frequency signal;
the pilot signal generation method comprises the steps of generating a narrowband main synchronization signal NPSS, a narrowband auxiliary synchronization signal NSSS and a baseband signal of a narrowband reference signal; the generation of the baseband signals of the narrowband primary synchronization signal NPSS, the narrowband secondary synchronization signal NSSS and the narrowband reference signal NRS comprises the following steps:
(1) generating a narrowband primary synchronization signal NPSS signal, wherein the narrowband primary synchronization signal is mapped on 1 st to 11 th sub-carriers of a 6 th sub-frame of each radio frame of an NB-IoT carrier, and the generation formula is as follows according to a 3GPP protocol:
(2) generating a narrowband auxiliary synchronization signal NSSS signal, wherein the narrowband auxiliary synchronization signal is mapped on all 12 subcarriers of the last 11 symbols on the 10 th subframe of every other radio frame of an NB-IoT carrier, and the generation formula is as follows according to a 3GPP protocol:
wherein, is a cell ID number;
(3) generating a narrowband reference signal NRS signal, mapping the narrowband reference signal on the last two symbols of all downlink subframes of the NB-IoT carrier except for mapping NPSS and NSSS, wherein the starting position is the correlation of an antenna port number and an NB-IoT cell ID number, and the generation formula is as follows:
wherein:
nsis the time slot number, l is the symbol number, NCPIs 1;
(4) carrying out 2048-point IFFT on the data subjected to resource mapping for OFDM modulation, wherein the formula of the OFDM modulation is as follows:
and inserting the OFDM modulated symbols into a CP with the length of 160 symbols in a symbol 0 of one time slot, and inserting other symbols into a CP with the length of 144 symbols to form one or more wireless frame data with the symbol rate of 30.72 Mbs.
2. The pilot signal generation method of an NB-IoT pilot signal generation device according to claim 1, wherein: the intermediate frequency carrier frequency output by the intermediate frequency control unit is 35MHz, and the intermediate frequency output power is-5 dBm.
3. The pilot signal generation method of an NB-IoT pilot signal generation device according to claim 1, wherein: the first local oscillator unit outputs dot frequency, the output frequency is fixed at 435MHz, and the output power range is-20 dBm-0 dBm.
4. The pilot signal generation method of an NB-IoT pilot signal generation device according to claim 1, wherein: the radio frequency output frequency of the radio frequency signal output by the second local oscillator unit is 700 MHz-2800 MHz, and the radio frequency output range is-20 dBm- +45dBm, and is used for frequency coverage of NB-IoT pilot signals and other communication system pilot signals.
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| CN108234374B (en) * | 2016-12-14 | 2020-09-25 | 联芯科技有限公司 | Uplink multi-carrier transmitting device, system and method |
| CN108811044B (en) * | 2017-04-28 | 2021-01-26 | 深圳市中兴微电子技术有限公司 | Frequency scanning method and device for small-bandwidth communication system |
| CN107743059A (en) * | 2017-08-23 | 2018-02-27 | 重庆邮电大学 | A method for detecting the number of antenna ports for narrowband Internet of Things |
| CN109639614B (en) * | 2018-12-03 | 2021-09-03 | 上海创远仪器技术股份有限公司 | System and method for vector magnitude error measurement for NB _ IoT broadcast channel |
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| EP1037395A3 (en) * | 1996-06-27 | 2003-04-23 | Interdigital Technology Corporation | Device and method for communication between base station and subscriber unit in CDMA communication system |
| CN103647529A (en) * | 2013-12-26 | 2014-03-19 | 中国电子科技集团公司第四十一研究所 | Multimode signal generating device and signal generating method thereof |
| CN205961090U (en) * | 2016-08-25 | 2017-02-15 | 上海创远仪器技术股份有限公司 | NB ioT pilot signal generating device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1037395A3 (en) * | 1996-06-27 | 2003-04-23 | Interdigital Technology Corporation | Device and method for communication between base station and subscriber unit in CDMA communication system |
| CN103647529A (en) * | 2013-12-26 | 2014-03-19 | 中国电子科技集团公司第四十一研究所 | Multimode signal generating device and signal generating method thereof |
| CN205961090U (en) * | 2016-08-25 | 2017-02-15 | 上海创远仪器技术股份有限公司 | NB ioT pilot signal generating device |
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