CN115174336B - Frequency offset estimation method, medium and device of DVB-RCS2 system - Google Patents
Frequency offset estimation method, medium and device of DVB-RCS2 system Download PDFInfo
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Classifications
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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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
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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
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a frequency offset estimation method, medium and device of a DVB-RCS2 system, wherein the method comprises the following steps: performing frame synchronization on the received signal; symbol synchronization is carried out on the frame synchronization sequence to obtain an optimal sampling point; modulating the preamble sequence, the postamble sequence and the pilot sequence by utilizing the optimal sampling point, and setting the symbols except the preamble sequence, the postamble sequence and the pilot sequence to 0 to obtain a sequence rx_symbol; multiplying rx_symbol by a carrier to obtain rx_symbol2; carrying out FFT on the rx_symbol and the rx_symbol2 to obtain fft_result and fft_result 2; taking the modes of the fft_result and the fft_result2 to obtain fft_result_abs and fft_result 2_abs; searching a maximum value position in the fft_result_abs and the fft_result_2_abs; and converting the maximum value position into frequency according to the symbol rate specified by DVB-RCS2 to obtain frequency offset f. The invention uses less resources and less processing delay, and can obtain FFT results with the same resolution.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a frequency offset estimation method, medium and device of a DVB-RCS2 system.
Background
Low orbit (LEO) satellites have low orbit heights and short propagation delays compared to high orbit (GEO) satellites. The path loss is small. However, since the low orbit satellite rotates around the earth faster than the earth itself, the satellite base station operates very fast relative to the satellite terminal, which can cause a very large doppler frequency offset for low orbit satellite radio communications. It is therefore important to address the DVB-RCS2 Doppler frequency offset.
The Doppler frequency offset caused by the relative motion and the crystal oscillator deviation of the transmitting end and the receiving end can introduce frequency offset into the received signal, and the frequency offset can introduce great error into the subsequent demodulation of the baseband receiver, thereby seriously affecting the error rate and the packet error rate of the wireless communication receiver. In order to solve the problem, the frequency offset estimation is usually performed on received data in a wireless communication receiver, and frequency offset correction is performed, and the residual frequency offset diverges a constellation diagram of a received signal to affect the decoding performance of a decoder, so that the accuracy of the frequency offset estimation directly affects the performance of the receiver. The DVB-RCS2 system adopts a working mechanism of short packet burst packets, has long communication distance, large path loss and low received signal to noise ratio of satellite communication, so that a method for realizing high-precision frequency offset estimation by using less resources is needed, the aperture of a received signal constellation diagram is converged, the performance of a Turbo decoder is exerted to the greatest extent, and the performance of a receiver is improved to the greatest extent.
Disclosure of Invention
The invention aims to provide a frequency offset estimation method, medium and device of a DVB-RCS2 system so as to solve the problems.
The invention provides a frequency offset estimation method of a DVB-RCS2 system, which comprises the following steps:
step 1: performing frame synchronization on the received signal to obtain a frame synchronization sequence;
step 2: symbol synchronization is carried out on the frame synchronization sequence to obtain an optimal sampling point rx_sync_symbol;
step 3: modulating the preamble sequence, the postamble sequence and the pilot sequence by utilizing the optimal sampling point rx_sync_symbol to obtain a sequence rx_sync_symbol_temp;
step 4: setting the symbols except the preamble sequence, the postamble sequence and the pilot sequence in the sequence rx_sync_symbol_temp to 0 to obtain the sequence rx_symbol;
step 5: multiplying the sequence rx_symbol by a carrier to obtain a sequence rx_symbol2;
step 6: performing FFT operation on the sequence rx_symbol and the sequence rx_symbol2 to obtain an operation result fft_result and an operation result fft_result2 respectively;
step 7: respectively taking the modes of the operation result fft_result and the operation result fft_result2 to obtain a mode taking result fft_result_abs and a mode taking result fft_result_2_abs;
step 8: searching the maximum value in the modulo result fft_result_abs and the modulo result fft_result_2_abs, and recording the maximum value max_value and the maximum value position max_location;
step 9: and converting the maximum value position max_locator into frequency according to the symbol rate specified by DVB-RCS2 to obtain frequency offset f.
Further, the method for performing frame synchronization on the received signal in step 1 is as follows:
QPSK modulation is carried out on a preamble sequence, a postamble sequence and a pilot sequence appointed by the DVB-RCS2 protocol;
performing conjugate convolution on the lead sequence, the postamble sequence and the pilot sequence after QPSK modulation and the received signal to obtain a correlation peak;
and obtaining a frame synchronization sequence according to the size of the correlation peak.
Further, in step 2, symbol synchronization is performed on the frame synchronization sequence by a zero crossing symbol synchronization method.
Further, in step 3, the method for de-modulating the preamble sequence, the postamble sequence and the pilot sequence by using the optimal sampling point rx_sync_symbol is as follows:
the optimal sampling point rx_sync_symbol is subjected to conjugate point multiplication with a lead sequence, a postamble sequence and a pilot sequence after QPSK modulation to realize de-modulation, and a sequence rx_sync_symbol_temp is obtained.
Further, the method of multiplying the sequence rx_symbol by a carrier in step 5 is as follows:
locally generating a carrier wave, wherein the carrier wave is two orthogonal single-tone signals;
and performing point multiplication on the sequence rx_symbol and a locally generated carrier wave to obtain a sequence rx_symbol2.
Further, the frequency of the single-tone signal is 1/2 of the FFT operation resolution.
Further, in step 9:
if the maximum value max_value is in the modulo result fft_result_abs, the frequency corresponding to the maximum value max_value is the frequency offset f;
if the maximum value max_value is in the modulo result fft_result 2_abs, the frequency corresponding to the maximum value max_value plus 1/2 of the FFT operation resolution is the frequency offset f.
The invention also provides a computer terminal storage medium, which stores computer terminal executable instructions for executing the frequency offset estimation method of the DVB-RCS2 system.
The present invention also provides a computing device comprising:
at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a method of frequency offset estimation for a DVB-RCS2 system as described above.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
the invention multiplies the de-modulated sequence by a carrier wave and simultaneously performs FFT with the de-modulated sequence, thus FFT with fewer points can be performed, fewer resources and fewer processing delays are used, and FFT results with the same resolution can be obtained.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly describe the drawings in the embodiments, it being understood that the following drawings only illustrate some embodiments of the present invention and should not be considered as limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a frequency offset estimation method of a DVB-RCS2 system in an embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, 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. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the 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.
Examples
Taking the DVB-RCS2 waveform 13 symbol rate 25M as an example for frequency offset estimation, as shown in FIG. 1, the embodiment provides a frequency offset estimation method of a DVB-RCS2 system, and comprises the following steps:
step 1: performing frame synchronization on the received signal to obtain a frame synchronization sequence:
QPSK modulation is carried out on a preamble sequence, a postamble sequence and a pilot sequence appointed by the DVB-RCS2 protocol;
performing conjugate convolution on the lead sequence, the postamble sequence and the pilot sequence after QPSK modulation and the received signal to obtain a correlation peak;
and obtaining a frame synchronization sequence according to the size of the correlation peak.
In this embodiment, the preamble sequence, the postamble sequence, and the pilot sequence are shown in table 1.
Table 1, preamble sequence, postamble sequence, and pilot sequence:
step 2: performing symbol synchronization on the frame synchronization sequence by a zero crossing symbol synchronization method to obtain an optimal sampling point rx_sync_symbol;
step 3: the preamble sequence, the postamble sequence and the pilot sequence are de-modulated by using the optimal sampling point rx_sync_symbol to obtain a sequence rx_sync_symbol_temp, which is specifically:
the optimal sampling point rx_sync_symbol is subjected to conjugate point multiplication with a lead sequence, a postamble sequence and a pilot sequence after QPSK modulation to realize de-modulation, and a sequence rx_sync_symbol_temp is obtained.
Step 4: setting the symbols except the preamble sequence, the postamble sequence and the pilot sequence in the sequence rx_sync_symbol_temp to 0 to obtain the sequence rx_symbol;
step 5: multiplying the sequence rx_symbol by a carrier to obtain the sequence rx_symbol2:
locally generating a carrier wave, wherein the carrier wave is two orthogonal single-tone signals; in this embodiment, the frequency of the tone signal is 1/2 of the FFT operation resolution, specifically 25000000/2048;
performing point multiplication on the sequence rx_symbol and a locally generated carrier wave to obtain a sequence rx_symbol2, which is expressed as:
rx_symbol2＝rx_symbol*exp(25000000/2048)。
step 6: FFT operation is carried out on the sequence rx_symbol and the sequence rx_symbol2 respectively, and an operation result fft_result2 are obtained respectively:
where k is the index of fft_result_temp and fft_resuul2_temp, z is the index of fft_result and fft_result2,
step 7: the operation result fft_result and the operation result fft_resul2 are respectively subjected to modulo extraction to obtain a modulo extraction result fft_result_abs and a modulo extraction result fft_resul2_abs, which are expressed as follows:
fft_resule_abs＝abs(fft_resule)
fft_resule2_abs＝abs(fft_resule2)
step 8: searching the maximum value in the modulo result fft_result_abs and the modulo result fft_result_2_abs, and recording the maximum value max_value and the maximum value position max_location;
step 9: converting the maximum value position max_locator into frequency according to the symbol rate specified by DVB-RCS2 to obtain frequency offset f; wherein:
if the maximum value max_value is in the modulo result fft_result_abs, the frequency corresponding to the maximum value max_value is the frequency offset f;
if the maximum value max_value is in the modulo result fft_result 2_abs, the frequency corresponding to the maximum value max_value plus 1/2 of the FFT operation resolution is the frequency offset f.
Expressed as:
furthermore, in some embodiments, a computer terminal storage medium is provided, storing computer terminal executable instructions for performing the frequency offset estimation method of the DVB-RCS2 system as described in the previous embodiments. Examples of the computer storage medium include magnetic storage media (e.g., floppy disks, hard disks, etc.), optical recording media (e.g., CD-ROMs, DVDs, etc.), or memories such as memory cards, ROMs, or RAMs, etc. The computer storage media may also be distributed over network-connected computer systems, such as stores for application programs.
Furthermore, in some embodiments, a computing device is presented comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a method of frequency offset estimation for a DVB-RCS2 system as described in the previous embodiments. Examples of computing devices include PCs, tablets, smartphones, PDAs, etc.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The frequency offset estimation method of the DVB-RCS2 system is characterized by comprising the following steps:
step 1: performing frame synchronization on the received signal to obtain a frame synchronization sequence;
step 2: symbol synchronization is carried out on the frame synchronization sequence to obtain an optimal sampling point rx_sync_symbol;
step 3: modulating the preamble sequence, the postamble sequence and the pilot sequence by utilizing the optimal sampling point rx_sync_symbol to obtain a sequence rx_sync_symbol_temp;
step 4: setting the symbols except the preamble sequence, the postamble sequence and the pilot sequence in the sequence rx_sync_symbol_temp to 0 to obtain the sequence rx_symbol;
step 5: multiplying the sequence rx_symbol by a carrier to obtain a sequence rx_symbol2; the method of multiplying the sequence rx_symbol by one carrier in step 5 is:
locally generating a carrier wave, wherein the carrier wave is two orthogonal single-tone signals;
performing point multiplication on the sequence rx_symbol and a locally generated carrier wave to obtain a sequence rx_symbol2;
step 6: performing FFT operation on the sequence rx_symbol and the sequence rx_symbol2 to obtain an operation result fft_result and an operation result fft_result2 respectively;
step 7: respectively taking the modes of the operation result fft_result and the operation result fft_result2 to obtain a mode taking result fft_result_abs and a mode taking result fft_result_2_abs;
step 8: searching the maximum value in the modulo result fft_result_abs and the modulo result fft_result_2_abs, and recording the maximum value max_value and the maximum value position max_location;
step 9: and converting the maximum value position max_locator into frequency according to the symbol rate specified by DVB-RCS2 to obtain frequency offset f.
2. The method for estimating frequency offset of DVB-RCS2 system according to claim 1, wherein the method for frame synchronizing the received signal in step 1 is as follows:
QPSK modulation is carried out on a preamble sequence, a postamble sequence and a pilot sequence appointed by the DVB-RCS2 protocol;
performing conjugate convolution on the lead sequence, the postamble sequence and the pilot sequence after QPSK modulation and the received signal to obtain a correlation peak;
and obtaining a frame synchronization sequence according to the size of the correlation peak.
3. The method for estimating frequency offset of DVB-RCS2 system according to claim 2 wherein in step 2, symbol synchronization is performed on the frame synchronization sequence by zero crossing symbol synchronization method.
4. The method for estimating frequency offset of DVB-RCS2 system according to claim 3, wherein the method for de-modulating the preamble sequence, the postamble sequence and the pilot sequence by using the optimal sampling point rx_sync_symbol in step 3 is as follows:
the optimal sampling point rx_sync_symbol is subjected to conjugate point multiplication with a lead sequence, a postamble sequence and a pilot sequence after QPSK modulation to realize de-modulation, and a sequence rx_sync_symbol_temp is obtained.
5. The method of frequency offset estimation for DVB-RCS2 system of claim 4 wherein the frequency of the tone signal is 1/2 of the FFT operation resolution.
6. The method for estimating frequency offset of DVB-RCS2 system according to claim 5, wherein in step 9:
if the maximum value max_value is in the modulo result fft_result_abs, the frequency corresponding to the maximum value max_value is the frequency offset f;
if the maximum value max_value is in the modulo result fft_result 2_abs, the frequency corresponding to the maximum value max_value plus 1/2 of the FFT operation resolution is the frequency offset f.
7. A computer terminal storage medium storing computer terminal executable instructions for performing the method of frequency offset estimation of a DVB-RCS2 system according to any of claims 1-6.
8. A computing device, comprising:
at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of frequency offset estimation for a DVB-RCS2 system according to any one of claims 1-6.
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