CN109302725B - LTE-Advanced high-speed asynchronous and synchronous extraction method and device - Google Patents
LTE-Advanced high-speed asynchronous and synchronous extraction method and device Download PDFInfo
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- CN109302725B CN109302725B CN201711459786.3A CN201711459786A CN109302725B CN 109302725 B CN109302725 B CN 109302725B CN 201711459786 A CN201711459786 A CN 201711459786A CN 109302725 B CN109302725 B CN 109302725B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
- H04L27/2663—Coarse synchronisation, e.g. by correlation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
- H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
- H04L7/0332—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop with an integrator-detector
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention belongs to the technical field of sweep frequency receivers, and particularly relates to an LTE-Advanced high-speed asynchronous and synchronous extraction method and device: the system comprises a universal air interface signal analysis platform, wherein the analysis platform comprises a radio frequency unit, a baseband unit and a power supply system, and an asynchronous coarse synchronization unit is further added; the asynchronous coarse synchronization unit consists of a data register, a programmable counter and a timing trigger circuit; the internal clock of the system is provided for the AD converter to carry out analog-to-digital conversion, and meanwhile, the output of the AD is stored in the data RAM. On the basis of original signal acquisition and analysis, the invention adds a set of clock timing synchronization device, and then corrects the synchronization position by a software algorithm. Has the following advantages: when the LTE-Advanced base station signal test is carried out indoors, the difficulty of a system algorithm is greatly reduced, and the pressure on hardware equipment is reduced, for example, an FPGA with smaller capacity can be selected for calculation. Different delay settings can be carried out on different measurement requirements, and the method has wider adaptability.
Description
Technical Field
The invention relates to the technical field of sweep frequency receivers for measuring air interface signals, in particular to an LTE-Advanced high-speed asynchronous synchronous extraction method and device.
Background
The sweep frequency receiver applied to air interface signal measurement can output results including a plurality of cell coverage parameters, broadcast channel system information and spectrum information, and can display the results in an intuitive and various mode, and can be widely applied to occasions such as network investigation, planning, construction, optimization and the like, wherein the application occasions comprise vehicle-mounted drive test, indoor and basement step test and the like.
For LTE-Advanced air interface signal analysis, PSS synchronization is a key step for system synchronization and measurement, and for a receiver with built-in GPS, BD and other modules and in an open field environment, after initial PSS synchronization, 1PPS of the GPS can be utilized for accurate synchronization and measurement. However, in indoor environments, basement environments and the like, the GPS signals cannot be received, and the system clock can only depend on the clock stability of the system clock. Therefore, PSS synchronization and data extraction and calculation are needed during each measurement, a large amount of time is additionally needed to be consumed, the measurement speed is influenced, and the test efficiency is greatly reduced. The cause analysis is as follows:
for searching of the appointed PCI, a large amount of multiplication operation is needed, for blind PCI searching, 1-5 seconds of synchronous searching time is needed for each traversal, the rough synchronization needs to carry out traversal searching on data to find out a rough range, and then accurate sampling points are positioned in a small range through fine synchronization. Wherein, the coarse synchronization time is the longest, which occupies more than 99% of the whole synchronization time.
In order to solve the above problems, the test can be completed at high speed even when there is no signal such as GPS/BD, and the system synchronization can be performed quickly. The invention adds an asynchronous synchronous unit on hardware and cooperates with a software algorithm to realize an indoor high-speed synchronization method.
Disclosure of Invention
The invention overcomes the defects existing in the prior art, and solves the technical problems that: the LTE-Advanced high-speed asynchronous synchronous extraction device and the method thereof are simple in system algorithm, capable of relieving equipment pressure and wide in adaptability.
In order to solve the technical problems, the invention adopts the following technical scheme: an LTE-Advanced high-speed asynchronous and synchronous extraction device,
the system comprises a universal air interface signal analysis platform, wherein the analysis platform comprises a radio frequency unit, a baseband unit and a power supply system, and an asynchronous coarse synchronization unit is further added; the asynchronous coarse synchronization unit consists of a data register, a programmable counter and a timing trigger circuit; a clock generator in the system is provided for the AD converter to perform analog-to-digital conversion, and meanwhile, the output of the AD is stored in a data RAM.
The extraction method of the LTE-Advanced high-speed asynchronous synchronous extraction device is also disclosed:
the method comprises the following steps: the radio frequency unit completes down-conversion processing of a broadband radio frequency signal, outputs an intermediate frequency signal with fixed frequency, completes sampling of the intermediate frequency signal by a baseband signal, then carries out operation by a DSP or an FPGA of the baseband unit, and when the measurement is carried out for the first time, as no measurement information exists, and a clock generator has no synchronization relation with a GPS, the baseband unit is required to complete a complete signal synchronization algorithm flow, and calculates and obtains a precise synchronization address and time; starting from the first measurement, the system counts a real-time tracking sampling clock generator and performs coarse synchronization; starting from the second measurement, controlling the sampling time of the baseband signal data by an asynchronous coarse synchronization unit according to the synchronous position calculated last time; thereafter, the data sampling time of the baseband is controlled by the asynchronous coarse synchronization unit.
As a preferable technical scheme of the invention, the original IQ data of 10ms is collected, the sampling rate is 30.72MHz, and the corresponding data capacity is 307200 data points.
As a preferred technical scheme of the invention, the data stored in the data RAM is output to the computer through the output interface for calculation, and after the software extracts the synchronization point of the data, different data are extracted at different positions according to the synchronization point for further analysis.
As a preferable technical scheme of the invention, the programmable counter counts the local clock, and the counting time is controlled by the bit number of the programmable counter and the offset of the data register.
As a preferable technical scheme of the invention, the control of the data stored in the data RAM is completed by timing triggering, and the starting time interval of the data stream sampled each time is ensured to be fixed.
Compared with the prior art, the invention has the following beneficial effects: on the basis of original signal acquisition and analysis, the invention adds a set of clock timing synchronization device, and then corrects the synchronization position by a software algorithm. Has the following advantages:
1) When the LTE-Advanced base station signal test is carried out indoors, the difficulty of a system algorithm is greatly reduced, and the pressure on hardware equipment is reduced, for example, an FPGA with smaller capacity can be selected for calculation.
2) Different delay settings can be carried out on different measurement requirements, and the method has wider adaptability.
3) The circuit has a simple structure, can be built in an FPGA, and can be realized for a baseband platform without adding hardware.
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The invention is described in further detail below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the system components of the present invention.
Fig. 2 is a schematic diagram of the working principle of the asynchronous coarse synchronization unit.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention discloses an LTE-Advanced high-speed asynchronous synchronous extraction method and device, and as shown in figure 1, the core of the invention is an asynchronous coarse synchronous unit. The universal air interface signal analysis platform basically comprises a radio frequency unit, a baseband unit and a power supply system. On the basis of the method, an asynchronous coarse synchronization unit is added, and initial acquisition of signals can be completed under an asynchronous clock. Because the PSS coarse synchronization is completed by the asynchronous coarse synchronization unit, the calculation time of the system is saved by 99%, and the whole efficiency of the system is greatly improved.
The basic working principle is that the radio frequency unit finishes the down-conversion processing of the broadband radio frequency signal, outputs the intermediate frequency signal with fixed frequency, the baseband signal finishes the sampling of the intermediate frequency signal, then the DSP or FPGA of the baseband unit carries out operation, and when the measurement is carried out for the first time, the clock generator has no synchronous relation with the GPS because of no measurement information, and the baseband unit is required to finish a complete signal synchronization algorithm flow, calculate and acquire the precise synchronization address and time. From the first measurement, the system counts the real-time tracking sampling clock generator and performs coarse synchronization. Starting from the second measurement, the sampling time of the baseband signal data is controlled by the asynchronous coarse synchronization unit according to the synchronous position calculated last time. Thereafter, the data sampling time of the baseband is controlled by the asynchronous coarse synchronous unit, which essentially controls the time interval between the subsequent sampling and the previous sampling, and ensures that the time interval between the two sampling is fixed.
The detailed operation of the asynchronous coarse synchronization unit is shown in fig. 2, and consists of a data register, a programmable counter and a timing trigger circuit. The internal clock of the system is provided for the AD converter to carry out analog-digital conversion, and meanwhile, the output storage of the AD is stored in a data RAM to complete synchronous searching. Generally, for an LTE-Advanced system, at least 10ms of original IQ data is required to be collected for accurate analysis synchronization and signal quality analysis, the sampling rate is 30.72MHz, and the corresponding data capacity is about 307200 data points. The data stored in the data RAM is output to the computer for calculation through the output interface, and the synchronous extraction algorithm is as shown in figure 1. After the software extracts the synchronization point of the data, different data are extracted at different positions according to the synchronization point to carry out further analysis. The programmable counter counts the local clock, and the counting time is controlled by the bit number of the programmable counter and the offset of the data register, so as to meet the requirements of different data lengths and measurement intervals. The timing trigger can complete the control of the data stored in the data RAM, and ensures that the starting time interval of the data stream sampled each time is fixed.
By timing control of each sampling, randomness of sampling time is eliminated, and time of sampling data twice is ensured to be approximately equal. The reason for this is that the local clock is not related to the GPS/BD, and the GPS/BD signal cannot be used for the self-team clock. For the above example, a 1ppm precision clock, a 1 second time error is about 30 sample periods, so that the extraction of the synchronization can be accomplished by subsequently increasing the number of fine syncs. For example, the second search can be increased to 50 sample searches based on the original 20 samples, and according to the method, the operation amount in synchronous extraction is only 2% of that of a complete synchronous algorithm, so that the operation time and efficiency are greatly saved, and the data output rate of the equipment is improved by 20 times.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (3)
1. An extraction method of an LTE-Advanced high-speed asynchronous synchronous extraction device is characterized in that,
the extraction device comprises: the system comprises a universal air interface signal analysis platform, a wireless communication system and a wireless communication system, wherein the analysis platform comprises a radio frequency unit, a baseband unit and a power supply system, and an asynchronous coarse synchronization unit is further added; the asynchronous coarse synchronization unit consists of a data register, a programmable counter and a timing trigger circuit, wherein the programmable counter counts a local clock, and the counting time is controlled by the bit number of the programmable counter and the offset of the data register; a clock generator in the system is provided for the AD converter to perform analog-to-digital conversion, and meanwhile, the output of the AD is stored in a data RAM;
the extraction method comprises the following steps: the radio frequency unit completes down-conversion processing of a broadband radio frequency signal, outputs an intermediate frequency signal with fixed frequency, completes sampling of the intermediate frequency signal by a baseband signal, then carries out operation by a DSP or an FPGA of the baseband unit, and when the measurement is carried out for the first time, as no measurement information exists, and a clock generator has no synchronization relation with a GPS, the baseband unit is required to complete a complete signal synchronization algorithm flow, and calculates and obtains a precise synchronization address and time; starting from the first measurement, the system counts a real-time tracking sampling clock generator and performs coarse synchronization; starting from the second measurement, controlling the sampling time of the baseband signal data by an asynchronous coarse synchronization unit according to the synchronous position calculated last time, and triggering at fixed time to finish the control of the data stored in the data RAM, so as to ensure that the starting time interval of the data stream sampled each time is fixed; thereafter, the data sampling time of the baseband is controlled by the asynchronous coarse synchronization unit.
2. The method for extracting the LTE-Advanced high-speed asynchronous synchronous extracting apparatus according to claim 1, wherein the original IQ data of 10ms is collected, the sampling rate is 30.72MHz, and the corresponding data capacity is 307200 data points.
3. The method for extracting the LTE-Advanced high-speed asynchronous synchronous extraction device according to claim 1, wherein the data stored in the data RAM is output to a computer through an output interface for calculation, and after the software extracts the synchronization point of the data, different data are extracted at different positions according to the synchronization point for further analysis.
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| US7478011B2 (en) * | 2006-12-19 | 2009-01-13 | International Business Machines Corporation | Method and system for measuring signal characteristics of data signals transmitted between integrated circuit chips |
| CN101895699B (en) * | 2010-06-30 | 2012-11-28 | 天津市德力电子仪器有限公司 | Ground digital television signal demodulating, decoding and analyzing method for quasi-real-time signal analyzer |
| CN103139127B (en) * | 2011-12-02 | 2016-12-21 | 上海无线通信研究中心 | Utilize the method that synchronizing sequence judges 3GPP LTE/LTE Advanced system transmission mode |
| CN103227686B (en) * | 2013-03-29 | 2015-04-08 | 中国电子科技集团公司第四十一研究所 | Signal processing method for mode switch device for multi-mode terminal general-purpose tester |
| WO2015076789A1 (en) * | 2013-11-19 | 2015-05-28 | Intel Corporation | Clock calibration using asynchronous digital sampling |
| CN107359953B (en) * | 2017-06-30 | 2018-11-06 | 京信通信***（中国）有限公司 | A kind of TD-LTE synchronous method and synchronizer |
| CN107241794B (en) * | 2017-06-30 | 2021-05-28 | 西安宇飞电子技术有限公司 | Rapid synchronous tracking method and device for TDD-OFDM downlink |
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