CN115174336A - 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
- Publication number
- CN115174336A CN115174336A CN202210851731.1A CN202210851731A CN115174336A CN 115174336 A CN115174336 A CN 115174336A CN 202210851731 A CN202210851731 A CN 202210851731A CN 115174336 A CN115174336 A CN 115174336A
- Authority
- CN
- China
- Prior art keywords
- sequence
- result
- fft
- symbol
- frequency offset
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 230000001360 synchronised effect Effects 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920001690 polydopamine Polymers 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The invention provides a frequency offset estimation method, a medium and a device of a DVB-RCS2 system, wherein the method comprises the following steps: performing frame synchronization on the received signal; carrying out symbol synchronization on the frame synchronization sequence to obtain an optimal sampling point; using the optimal sampling point to demodulate the leader sequence, the postcursor sequence and the pilot sequence, and setting symbols except the leader sequence, the postcursor sequence and the pilot sequence to be 0 to obtain a sequence rx _ symbol; multiplying rx _ symbol by a carrier to obtain rx _ symbol2; FFT is carried out on rx _ symbol and rx _ symbol2 to obtain FFT _ result and FFT _ result 2; performing modulo on fft _ result and fft _ result2 to obtain fft _ result _ abs and fft _ result 2_ abs; searching the position of the maximum value in fft _ result _ abs and 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 the FFT result 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 a low orbital altitude and a short transmission delay 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 rotates, the satellite base stations operate at a very high speed relative to the satellite terminals, which causes a very large doppler frequency offset to the low-orbit satellite wireless communication. It is therefore important to account for the DVB-RCS2 doppler frequency offset.
The Doppler frequency offset caused by relative motion and the crystal oscillator deviation of a sending end and a receiving end can introduce frequency offset into a received signal, and the frequency offset can introduce great errors into subsequent demodulation of a baseband receiver, so that the error rate and the packet error rate of the wireless communication receiver are seriously influenced. 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 disperses a constellation diagram of a received signal to influence the decoding performance of a decoder, so that the accuracy of the frequency offset estimation directly influences the performance of the receiver. The DVB-RCS2 system adopts a working mechanism of short packet burst packets, and the satellite communication has long communication distance, large path loss and low received signal-to-noise ratio, 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 brought into play to the utmost extent, and the performance of a receiver is improved to the maximum extent.
Disclosure of Invention
The present invention is directed to a method, medium, and apparatus for estimating frequency offset of a DVB-RCS2 system, so as to solve the above existing problems.
The invention provides 1. A frequency offset estimation method of a DVB-RCS2 system, which comprises the following steps:
step 1: carrying out frame synchronization on the received signal to obtain a frame synchronization sequence;
step 2: carrying out symbol synchronization on the frame synchronization sequence to obtain an optimal sampling point rx _ sync _ symbol;
and 3, step 3: using the optimal sampling point rx _ sync _ symbol to modulate the leader sequence, the postamble sequence and the pilot sequence to obtain a sequence rx _ sync _ symbol _ temp;
and 4, step 4: setting symbols except a leader sequence, a postamble sequence and a pilot sequence in the sequence rx _ sync _ symbol _ temp to 0 to obtain a sequence rx _ symbol;
and 5: multiplying the sequence rx _ symbol by a carrier to obtain a sequence rx _ symbol2;
step 6: respectively carrying out FFT operation on the sequence rx _ symbol and the sequence rx _ symbol2 to respectively obtain an operation result FFT _ result and an operation result FFT _ result 2;
and 7: modulus is respectively taken for the operation result fft _ result and the operation result fft _ result2 to obtain a modulus taking result fft _ result _ abs and a modulus taking result fft _ result 2_ abs;
and 8: searching a maximum value in the modulus-taking result fft _ result _ abs and the modulus-taking result fft _ result 2_ abs, and recording the maximum value max _ value and the maximum value position max _ locate;
and step 9: and converting the maximum value position max _ location into frequency according to the designated symbol rate of DVB-RCS2 to obtain frequency offset f.
Further, the method for performing frame synchronization on the received signal in step 1 is as follows:
performing QPSK modulation on a leader sequence, a postcursor sequence and a pilot sequence specified by a DVB-RCS2 protocol;
performing conjugate convolution on the pilot sequence, the postamble sequence and the pilot sequence modulated by the QPSK and the received signal to obtain a correlation peak;
and obtaining the frame synchronization sequence according to the size of the correlation peak.
Further, in step 2, the frame synchronization sequence is symbol-synchronized by a zero-crossing symbol synchronization method.
Further, the method for demodulating 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:
and performing conjugate multiplication on the optimal sampling point rx _ sync _ symbol and the QPSK modulated preamble sequence, the QPSK modulated postamble sequence and the pilot sequence to realize demodulation, thereby obtaining a sequence rx _ sync _ symbol _ temp.
Further, the method for multiplying the sequence rx _ symbol by one carrier in step 5 is as follows:
locally generating a carrier wave, wherein the carrier wave is two orthogonal single tone signals;
and performing dot multiplication on the sequence rx _ symbol and a locally generated carrier 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 present invention also provides a computer terminal storage medium storing computer terminal executable instructions for performing 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 invention has the beneficial effects that:
the invention multiplies the unmodulated sequence by a carrier wave, and performs FFT with the unmodulated sequence at the same time, so that FFT with fewer points can be performed, fewer resources are used, and FFT results with the same resolution can be obtained by using less processing delay.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and it is obvious for those skilled in the art that other related drawings can be obtained according to these drawings without inventive efforts.
Fig. 1 is a flowchart of a frequency offset estimation method of a DVB-RCS2 system in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of 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 present invention, 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Taking symbol rate 25M of DVB-RCS2 waveform 13 as an example to perform frequency offset estimation, as shown in fig. 1, this embodiment provides a frequency offset estimation method for a DVB-RCS2 system, and includes the following steps:
step 1: carrying out frame synchronization on the received signal to obtain a frame synchronization sequence:
performing QPSK modulation on a leader sequence, a postcursor sequence and a pilot sequence specified by a DVB-RCS2 protocol;
conjugate convolution is carried out on the leader sequence, the postcursor sequence and the pilot sequence after QPSK modulation and a received signal to obtain a correlation peak;
and obtaining the 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, postamble and pilot sequences:
and 2, step: carrying out symbol synchronization on the frame synchronization sequence by a zero crossing point symbol synchronization method to obtain an optimal sampling point rx _ sync _ symbol;
and step 3: the optimal sampling point rx _ sync _ symbol is used to demodulate the preamble sequence, the postamble sequence and the pilot sequence to obtain a sequence rx _ sync _ symbol _ temp, which specifically comprises:
and performing conjugate point multiplication on the optimal sampling point rx _ sync _ symbol, the QPSK modulated preamble sequence, the QPSK modulated postamble sequence and the pilot sequence to realize demodulation, and obtaining a sequence rx _ sync _ symbol _ temp.
And 4, step 4: setting symbols except a leader sequence, a postamble sequence and a pilot sequence in the sequence rx _ sync _ symbol _ temp to 0 to obtain a sequence rx _ symbol;
and 5: multiplying the sequence rx _ symbol by a carrier to obtain a 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 single tone signal is 1/2 of the FFT operation resolution, specifically 25000000/2048;
performing dot multiplication on the sequence rx _ symbol and a locally generated carrier to obtain a sequence rx _ symbol2, which is expressed as:
rx_symbol2＝rx_symbol*exp(25000000/2048)。
and 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 _ result 2:
wherein k is fft _ result _ temp and fft _ resple2_ temp, z is the indices of fft _ result and fft _ result2,
and 7: the operation result fft _ result and the operation result fft _ result2 are respectively modulo to obtain a modulo result fft _ result _ abs and a modulo result fft _ result 2_ abs, which are expressed as:
fft_resule_abs＝abs(fft_resule)
fft_resule2_abs＝abs(fft_resule2)
and 8: searching a maximum value in the modulus-taking result fft _ result _ abs and the modulus-taking result fft _ result 2_ abs, and recording the maximum value max _ value and the maximum value position max _ locate;
and step 9: converting the maximum value position max _ locate into frequency according to the designated symbol rate of 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 resolution of the FFT operation is the frequency offset f.
Expressed as:
furthermore, in some embodiments, a computer terminal storage medium is proposed, which stores 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 a magnetic storage medium (e.g., a floppy disk, a hard disk, etc.), an optical recording medium (e.g., a CD-ROM, a DVD, etc.), or a memory such as a memory card, a ROM, a RAM, or the like. The computer storage media may also be distributed over network-connected computer systems, such as an application store.
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 previous embodiments. Examples of computing devices include PCs, tablets, smart phones, or PDAs, among others.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A frequency offset estimation method of a DVB-RCS2 system is characterized by comprising the following steps:
step 1: carrying out frame synchronization on the received signal to obtain a frame synchronization sequence;
step 2: carrying out symbol synchronization on the frame synchronization sequence to obtain an optimal sampling point rx _ sync _ symbol;
and step 3: using the optimal sampling point rx _ sync _ symbol to modulate the leader sequence, the postamble sequence and the pilot sequence to obtain a sequence rx _ sync _ symbol _ temp;
and 4, step 4: setting symbols except a leader sequence, a postamble sequence and a pilot sequence in the sequence rx _ sync _ symbol _ temp to 0 to obtain a sequence rx _ symbol;
and 5: multiplying the sequence rx _ symbol by a carrier to obtain a sequence rx _ symbol2;
step 6: respectively carrying out FFT operation on the sequence rx _ symbol and the sequence rx _ symbol2 to respectively obtain an operation result FFT _ result and an operation result FFT _ result 2;
and 7: modulus is respectively taken for the operation result fft _ result and the operation result fft _ result2 to obtain a modulus taking result fft _ result _ abs and a modulus taking result fft _ result 2_ abs;
and 8: searching a maximum value in the modulus-taking result fft _ result _ abs and the modulus-taking result fft _ result 2_ abs, and recording the maximum value max _ value and the maximum value position max _ locate;
and step 9: and converting the maximum value position max _ location into frequency according to the designated symbol rate of DVB-RCS2 to obtain frequency offset f.
2. The frequency offset estimation method of DVB-RCS2 system according to claim 1, wherein the method of frame synchronization of the received signal in step 1 comprises:
performing QPSK modulation on a leader sequence, a postcursor sequence and a pilot sequence specified by a DVB-RCS2 protocol;
performing conjugate convolution on the pilot sequence, the postamble sequence and the pilot sequence modulated by the QPSK and the received signal to obtain a correlation peak;
and obtaining the frame synchronization sequence according to the size of the correlation peak.
3. The frequency offset estimation method of DVB-RCS2 system according to claim 2, wherein the frame synchronization sequence is symbol synchronized in step 2 by a zero crossing symbol synchronization method.
4. The frequency offset estimation method of DVB-RCS2 system according to claim 3, wherein the method of demodulating the preamble sequence, the postamble sequence and the pilot sequence by using the optimal sampling point rx _ sync _ symbol in step 3 comprises:
and performing conjugate multiplication on the optimal sampling point rx _ sync _ symbol and the QPSK modulated preamble sequence, the QPSK modulated postamble sequence and the pilot sequence to realize demodulation, thereby obtaining a sequence rx _ sync _ symbol _ temp.
5. The frequency offset estimation method of DVB-RCS2 system according to claim 4, characterized in that the step 5 of multiplying the sequence rx _ symbol by a carrier is as follows:
locally generating a carrier wave, wherein the carrier wave is two orthogonal single tone signals;
and performing dot multiplication on the sequence rx _ symbol and the locally generated carrier to obtain a sequence rx _ symbol2.
6. The frequency offset estimation method of the DVB-RCS2 system according to claim 5, wherein the frequency of said single tone signal is 1/2 of the FFT calculation resolution.
7. The frequency offset estimation method of DVB-RCS2 system according to claim 6, 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.
8. A computer terminal storage medium storing computer terminal executable instructions for performing a method of frequency offset estimation for a DVB-RCS2 system according to any of claims 1 to 7.
9. 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 cause the at least one processor to perform the method of frequency offset estimation for DVB-RCS2 system according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210851731.1A CN115174336B (en) | 2022-07-20 | 2022-07-20 | Frequency offset estimation method, medium and device of DVB-RCS2 system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210851731.1A CN115174336B (en) | 2022-07-20 | 2022-07-20 | Frequency offset estimation method, medium and device of DVB-RCS2 system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115174336A true CN115174336A (en) | 2022-10-11 |
| CN115174336B CN115174336B (en) | 2023-10-31 |
Family
ID=83495838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210851731.1A Active CN115174336B (en) | 2022-07-20 | 2022-07-20 | Frequency offset estimation method, medium and device of DVB-RCS2 system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115174336B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070037004A (en) * | 2005-09-30 | 2007-04-04 | 주식회사 팬택 | Maximum-likelihood symbol timing and carrier frequency offset estimation method and apparatus for ofdm systems based on a preamble with two identical part |
| US20070133391A1 (en) * | 2005-11-29 | 2007-06-14 | Hee-Jin Roh | Apparatus and method for carrier frequency synchronization in an OFDM system |
| US20090154601A1 (en) * | 2007-12-12 | 2009-06-18 | Harris Corporation | Communications device and related method with improved acquisition estimates of frequency offset and phase error |
| CN101699776A (en) * | 2009-11-10 | 2010-04-28 | 京信通信***（中国）有限公司 | Down link synchronization method applied to CDMA20001x system |
| CN102412866A (en) * | 2011-11-23 | 2012-04-11 | 北京泰美世纪科技有限公司 | Joint estimation method and system for carrier frequency offset, frame head phase position and fine symbol timing |
| CN102833204A (en) * | 2012-08-24 | 2012-12-19 | 西安空间无线电技术研究所 | Frequency offset estimation implementation method |
| CN106508104B (en) * | 2010-03-26 | 2014-04-23 | 清华大学 | A kind of method of extension remote measurement coherent receiver frequency offset estimation range |
| CN104038460A (en) * | 2014-01-27 | 2014-09-10 | 中国电子科技集团公司第十研究所 | Carrier wave frequency offset capture circuit |
| CN106453188A (en) * | 2016-09-29 | 2017-02-22 | 上海航天测控通信研究所 | Rapid and accurate frequency synchronization method applicable for MPSK demodulation |
| CN114070703A (en) * | 2021-11-18 | 2022-02-18 | 成都中科微信息技术研究院有限公司 | Low-orbit satellite DVB-RCS2 system-based general method and system for frequency offset estimation tracking and compensation under low signal-to-noise ratio |
| CN114172771A (en) * | 2021-11-30 | 2022-03-11 | 中科南京移动通信与计算创新研究院 | Method and system for rapid frequency offset estimation and compensation based on burst communication |
| US20220173945A1 (en) * | 2020-12-01 | 2022-06-02 | Silicon Laboratories Inc. | Adjusting receiver frequency to compensate for frequency offset during a sounding sequence used for fractional time determination |
-
2022
- 2022-07-20 CN CN202210851731.1A patent/CN115174336B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070037004A (en) * | 2005-09-30 | 2007-04-04 | 주식회사 팬택 | Maximum-likelihood symbol timing and carrier frequency offset estimation method and apparatus for ofdm systems based on a preamble with two identical part |
| US20070133391A1 (en) * | 2005-11-29 | 2007-06-14 | Hee-Jin Roh | Apparatus and method for carrier frequency synchronization in an OFDM system |
| US20090154601A1 (en) * | 2007-12-12 | 2009-06-18 | Harris Corporation | Communications device and related method with improved acquisition estimates of frequency offset and phase error |
| CN101699776A (en) * | 2009-11-10 | 2010-04-28 | 京信通信***（中国）有限公司 | Down link synchronization method applied to CDMA20001x system |
| CN106508104B (en) * | 2010-03-26 | 2014-04-23 | 清华大学 | A kind of method of extension remote measurement coherent receiver frequency offset estimation range |
| CN102412866A (en) * | 2011-11-23 | 2012-04-11 | 北京泰美世纪科技有限公司 | Joint estimation method and system for carrier frequency offset, frame head phase position and fine symbol timing |
| CN102833204A (en) * | 2012-08-24 | 2012-12-19 | 西安空间无线电技术研究所 | Frequency offset estimation implementation method |
| CN104038460A (en) * | 2014-01-27 | 2014-09-10 | 中国电子科技集团公司第十研究所 | Carrier wave frequency offset capture circuit |
| CN106453188A (en) * | 2016-09-29 | 2017-02-22 | 上海航天测控通信研究所 | Rapid and accurate frequency synchronization method applicable for MPSK demodulation |
| US20220173945A1 (en) * | 2020-12-01 | 2022-06-02 | Silicon Laboratories Inc. | Adjusting receiver frequency to compensate for frequency offset during a sounding sequence used for fractional time determination |
| CN114070703A (en) * | 2021-11-18 | 2022-02-18 | 成都中科微信息技术研究院有限公司 | Low-orbit satellite DVB-RCS2 system-based general method and system for frequency offset estimation tracking and compensation under low signal-to-noise ratio |
| CN114172771A (en) * | 2021-11-30 | 2022-03-11 | 中科南京移动通信与计算创新研究院 | Method and system for rapid frequency offset estimation and compensation based on burst communication |
Non-Patent Citations (3)
| Title |
|---|
| SHENGZHOU, HUIMINCHEN, YONGXIONG, LINGU: "The Study on the Algorithm of Frequency Offset Estimation in Broadband Wireless Access Systems", 《2007 IET CONFERENCE ON WIRELESS, MOBILE AND SENSOR NETWORKS (CCWMSN07)》 * |
| 常倩: "数字卫星通信***中QPSK频偏估计技术的研究", 《中国优秀硕士学位论文全文数据库》 * |
| 韦涛;梁碧珍;: "OFDM通信***中的频偏估计和抑制算法", 移动通信, no. 16 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115174336B (en) | 2023-10-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0772330A2 (en) | Receiver and method for receiving OFDM signals | |
| US10594535B2 (en) | System and method for extracting satellite to ground link quality using satellite telemetry signal and low complexity receiver | |
| US11005525B2 (en) | Methods for improving flexibility and data rate of chirp spread spectrum systems in LoRaWAN | |
| CN110300079B (en) | MSK signal coherent demodulation method and system | |
| CN113872909B (en) | Short-time burst carrier capturing method and system for low-orbit satellite Internet of things | |
| US6549594B1 (en) | Timing phase recovery method and apparatus | |
| CN107682294B (en) | FPGA-based phase ambiguity correction method for high-speed 16apsk signal | |
| CN108111450B (en) | Method for simulating dynamic characteristics of target by adopting incoherent demodulation | |
| JP2008530951A (en) | Demodulator and receiver for pre-encoded partial response signals | |
| CN112422168B (en) | Signal modulation and demodulation method and system in large dynamic satellite communication system | |
| CN101232480B (en) | Method and device for regulating frequency offset | |
| CN115174336A (en) | Frequency offset estimation method, medium and device of DVB-RCS2 system | |
| JPH08265292A (en) | Ofdm receiver | |
| Vilnrotter et al. | Telecommand/telemetry ranging for deep-space applications | |
| US6662000B1 (en) | Synchronisation method and device for a communication receiver | |
| CN115632923A (en) | OQPSK (offset quadrature phase shift keying) -based unmanned aerial vehicle and satellite ultra-wideband communication method and related equipment | |
| US20090016467A1 (en) | Noncoherent symbol clock recovery subsystem | |
| CN115022128A (en) | Parity block FFT-based CSK modulation efficient demodulation algorithm | |
| US9859958B2 (en) | Frequency estimator for aeronautical communication | |
| US6016328A (en) | Method and apparatus for the synchronization of a signal receiving station | |
| JP5761748B2 (en) | Symbol synchronization acquisition system and method | |
| Lan et al. | A pipelined synchronization approach for satellite-based automatic identification system | |
| CN116155668B (en) | Anti-frequency offset carrier recovery method, system and storage medium | |
| CN113452406B (en) | Signal demodulation method, device, equipment and medium with variable transmission rate | |
| CN115883302A (en) | Load phase tracking method, device and medium based on training sequence |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |