CN104639479B - A kind of frequency offset correction method and apparatus - Google Patents
A kind of frequency offset correction method and apparatus Download PDFInfo
- Publication number
- CN104639479B CN104639479B CN201510055835.1A CN201510055835A CN104639479B CN 104639479 B CN104639479 B CN 104639479B CN 201510055835 A CN201510055835 A CN 201510055835A CN 104639479 B CN104639479 B CN 104639479B
- Authority
- CN
- China
- Prior art keywords
- antenna
- frequency deviation
- channel estimation
- data
- estimation results
- 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.)
- Active
Links
Abstract
The invention discloses a kind of frequency offset correction methods, by carrying out matched filtering processing according to data of the channel estimation results to each antenna after the channel estimation results for obtaining each antenna, frequency deviation compensation is then carried out to the result of each antenna match filtering respectively in the frequency deviation of each antenna according to user, it finally obtains the compensated correction data of frequency deviation and multiple antennas merging is carried out to correction data, the problem of accurate offset estimation value can not averagely be found out caused by differing greatly so as to avoid frequency deviation between each antenna of spaced antenna by multiple antennas, improve the accuracy of offset estimation, it ensure that demodulation performance.
Description
Technical field
The present invention relates to field of communication technology, in particular to a kind of frequency offset correction method.The present invention also relates to one kind
Frequency offset correction equipment.
Background technique
With the development of high-speed railway, spaced antenna obtains extensively as the network coverage scheme under high-speed mobile environment
Using being mainly used for expanding the coverage area of single subdistrict, avoid frequent cell switching bring call drop and user experience
The problems such as variation.
As shown in Figure 1, being application schematic diagram of the existing spaced antenna under High-speed Circumstance, wherein Fd=(V/ λ) *
COS а is Doppler shift formula, and the V in the formula is the movement velocity of mobile station；λ is radio wavelength；а indicates incidence wave
With the angle between the mobile station direction of motion.For use spaced antenna networking mode mobile station for, due to its
Relative to the direction of motion of new and old two groups of antennas on the contrary, being caused respectively by the frequency deviation that Doppler frequency shift generates when being moved between two groups of antennas
Difference is larger between antenna or even symbol is on the contrary, make the existing frequency offset correction scheme for being suitable for intelligent antenna array no longer suitable
With having seriously affected the demodulation performance of receiving end.
In order to solve due to spaced antenna be applied to High-speed Circumstance under and frequency deviation differs greatly very between each antenna of bring
To opposite problem.In existing high-speed mobile business solution, base station use offset estimation twice and compensation process with
Reach preferable performance.Frequency deviation is estimated according to the channel response that each antenna channel is estimated first, obtains the frequency of each antenna
Inclined estimated result, after which is weighted and averaged and is returned averagely by antenna signal power, for what is obtained to joint-detection
Detection data carries out preliminary frequency offset correction, corrects biggish frequency deviation；Estimated further according to corrected data using data symbol frequency deviation
Meter method calculates frequency deviation again, and carries out secondary frequency offset compensation to the data after preliminary corrections, inherent spurious frequency deviation is corrected, finally to warp
Data after frequency offset correction twice carry out demodulation judgement.This scheme is built upon the little basis of frequency deviation difference between each antenna
On, such as intelligent antenna array, to the High-speed Circumstance using distributed antenna coverage mode, this scheme accuracy is substantially reduced.
In the implementation of the present invention, at least there is following problems for inventor's discovery prior art:
(1) application scenarios are limited.It is little that existing offset estimation and compensation scheme are suitable for frequency deviation difference between each antenna
In the case of, such as intelligent antenna array, but smart antenna coverage mode is used, cell coverage area is smaller, and high-speed mobile will cause
Frequent cell switching, leads to problems such as call drop and user experience be deteriorated, therefore being suitable for movement speed not is extra high feelings
Under condition.
(2) spaced antenna scene frequency deviation estimation accuracy is low.In the High-speed Circumstance using spaced antenna covering,
When mobile station moves between two groups of antennas, since the direction of motion of opposite two groups of antennas is on the contrary, the frequency deviation generated differs greatly very
It is jumped to symbol, by being unable to get accurate offset estimation value to the averaging of each antenna frequency deviation.First frequency offset correction inaccuracy,
The performance for directly affecting secondary offset estimation and calibration causes the performance of entire offset estimation and compensation scheme to be difficult to ensure.
Summary of the invention
The present invention provides a kind of frequency offset correction methods, to solve offset estimation caused by each antenna frequency deviation differs greatly
Inaccurate problem, guarantees the demodulation performance under high velocity environment.This method comprises:
After the channel estimation results for obtaining each antenna, according to the channel estimation results to the data of each antenna
Carry out matched filtering processing；
Determine user in the frequency deviation of each antenna according to the channel estimation results；
Frequency deviation compensation is carried out to the result of each antenna match filtering respectively in the frequency deviation of each antenna according to user,
The frequency deviation is determined according to the channel estimation results；
The compensated correction data of the frequency deviation is obtained, and multiple antennas merging is carried out to the correction data, to generate use
In the merging data for continuing joint-detection.
Preferably, matched filtering processing is carried out according to data of the channel estimation results to each antenna, specifically:
According to LTE Baseband Processing Unit the base band data of received each antenna determine the channel estimation knot of each antenna
Fruit；
Sytem matrix is generated according to the channel estimation results of each antenna, matched filtering is carried out to each antenna data.
Preferably, according to the channel estimation results determine user in the frequency deviation of each antenna, specifically:
Determine that user estimates in the upper frequency deviation of each antenna using the channel estimation results and original midamble code
Evaluation；
Recursive average is carried out respectively to the offset estimation value, using the offset estimation value after recursive average as each day
The frequency deviation of line.
Preferably, after carrying out multiple antennas merging to the correction data, further includes:
Joint-detection is carried out according to the merging data；
Secondary frequency offset estimation result after obtaining the joint-detection, and two are carried out according to the secondary frequency offset estimation result
Secondary frequency deviation compensation；
Secondary correction data after obtaining the secondary frequency offset compensation, the secondary correction data are sentenced for being soft demodulated
Certainly.
Correspondingly, the invention also provides a kind of frequency offset correction equipment, comprising:
Filter module, for after the channel estimation results for obtaining each antenna, according to the channel estimation results to institute
The data for stating each antenna carry out matched filtering processing；
Frequency deviation module, for determining user in the frequency deviation of each antenna according to the channel estimation results；
Compensating module, the result for being filtered respectively to each antenna match according to user in the frequency deviation of each antenna
Frequency deviation compensation is carried out, the frequency deviation is determined according to the channel estimation results；
Merging module for obtaining the frequency deviation compensation post-equalization data, and carries out multiple antennas conjunction to the correction data
And to generate the merging data for continuing joint-detection.
Preferably, the filter module specifically includes:
Channel estimation submodule, for according to LTE Baseband Processing Unit received each antenna base band data determine described in
The channel estimation results of each antenna；
Submodule is filtered, for generating sytem matrix according to the channel estimation results of each antenna, to each antenna data
Carry out matched filtering.
Preferably, the frequency deviation module specifically includes:
Submodule is estimated, for determining user in each day using the channel estimation results and original midamble code
The upper offset estimation value of line；
Recurrence submodule estimates the frequency deviation after recursive average for carrying out recursive average respectively to the offset estimation value
Frequency deviation of the evaluation as each antenna.
Preferably, which is characterized in that further include:
Secondary frequency offset compensation block, for carrying out joint-detection according to the merging data, after obtaining the joint-detection
Secondary frequency offset estimation result, and secondary frequency offset compensation is carried out according to the secondary frequency offset estimation result, obtains the secondary frequency
Secondary correction data after offset compensation, the secondary correction data are for being soft demodulated judgement.
It can be seen that passing through the basis after the channel estimation results for obtaining each antenna by applying above technical scheme
Channel estimation results carry out matched filtering processing to the data of each antenna, then according to user each antenna frequency deviation respectively to each
The result of antenna match filtering carries out frequency deviation compensation, finally obtains the compensated correction data of frequency deviation and carries out to correction data more
Antenna merges, and can not averagely be found out by multiple antennas caused by differing greatly so as to avoid frequency deviation between each antenna of spaced antenna
The problem of accurate offset estimation value, the accuracy of offset estimation is improved, ensure that demodulation performance.
Detailed description of the invention
Fig. 1 is application schematic diagram of the existing spaced antenna under High-speed Circumstance；
Fig. 2 is a kind of flow diagram of frequency offset correction method proposed by the present invention；
Fig. 3 is specific embodiment of the invention frequency deviation calibration algorithm flow diagram；
Fig. 4 is a kind of structural schematic diagram for frequency offset correction equipment that the present invention also proposes.
Specific embodiment
The problem of in view of proposed in background technique, the invention proposes a kind of frequency offset correction methods, in ascending time slot
The frequency deviation for estimating each antenna respectively using channel estimation results return mean deviation after the filtering of each antenna match, more days
Line number carries out frequency deviation compensation to each antenna data respectively according to before merging, to solve frequency deviation caused by each antenna frequency deviation differs greatly
Estimate inaccurate problem, guarantees the demodulation performance under high velocity environment.As shown in Fig. 2, method includes the following steps:
S201, after the channel estimation results for obtaining each antenna, according to the channel estimation results to each antenna
Data carry out matched filtering processing.
In the preferred embodiment of the invention, in the step first according to LTE Baseband Processing Unit received each antenna
Base band data determines the channel estimation results of each antenna, then generates system further according to the channel estimation results of each antenna
System matrix carries out matched filtering to each antenna data.
S202 determines user in the frequency deviation of each antenna according to the channel estimation results.
In the preferred embodiment of the invention, which is determined using the channel estimation results and original midamble code
Upper offset estimation value of the user in each antenna；
Recursive average is carried out respectively to the offset estimation value, using the offset estimation value after recursive average as each day
The frequency deviation of line.
S203 carries out frequency deviation to the result of each antenna match filtering respectively in the frequency deviation of each antenna according to user
Compensation, the frequency deviation is determined according to the channel estimation results.
S204 obtains the compensated correction data of the frequency deviation, and carries out multiple antennas merging to the correction data, with life
At the merging data for continuing joint-detection.
In order to realize the accurate alignment of frequency deviation, the preferred embodiment of the invention will also continue according to after this step
Merging data progress joint-detection, the secondary frequency offset estimation result after obtaining the joint-detection, and according to the secondary frequency deviation
Estimated result carries out secondary frequency offset compensation, the secondary correction data after obtaining the secondary frequency offset compensation, the secondary correction number
According to for being soft demodulated judgement.
For the technical idea that the present invention is further explained, now in conjunction with specific application scenarios, to technical side of the invention
Case is illustrated.Core of the invention be between each antenna shown under High-speed Circumstance for spaced antenna frequency deviation difference compared with
Big feature, still by the way of offset estimation twice and compensation, after first frequency offset correction is advanceed to each antenna match filtering,
Before multi-antenna data merges, recursive average is carried out to each antenna respectively and frequency deviation compensates.The purpose handled in this way is avoided right
When multiple antennas frequency offset estimation result takes weighted average, since frequency deviation difference causes greatly the frequency offset estimation result after being averaged between each antenna
Inaccuracy seriously affects demodulation performance.
As shown in figure 3, showing for frequency offset correction algorithm flow under spaced antenna High-speed Circumstance in the specific embodiment of the invention
It is intended to, offset estimation and backoff algorithm detailed process are as follows under the spaced antenna High-speed Circumstance:
1) channel estimation of each antenna is calculated according to the base band data that LTE Baseband Processing Unit receives；
2) sytem matrix is generated using channel estimation results, matched filtering is carried out to each antenna data；
3) user is calculated in the upper frequency deviation of each antenna using channel estimation and original midamble code, each antenna frequency deviation is estimated
Evaluation carries out recursive average respectively；
4) first frequency deviation compensation is carried out to the result of each antenna match filtering respectively, corrects big frequency deviation, obtains first school
Correction data；
5) multiple antennas merging is carried out to first correction data, the data after merging continue joint-detection.
It should be noted that after the above process terminates, behind process it is consistent with existing algorithm implementation, to joint
The result of detection carries out offset estimation using data symbol frequency deviation estimating method again, obtains small-scale more accurate frequency deviation and estimates
For meter as a result, simultaneously carrying out frequency deviation compensation again, correction inherent spurious frequency deviation, the data after obtaining secondary correction are used for subsequent soft demodulation
Judgement.
To reach the above technical purpose, the invention also provides a kind of frequency offset correction equipment, as shown in Figure 4, comprising:
Filter module 410, for after the channel estimation results for obtaining each antenna, according to the channel estimation results pair
The data of each antenna carry out matched filtering processing；
Frequency deviation module 420, for determining user in the frequency deviation of each antenna according to the channel estimation results；
Compensating module 430, for what is filtered respectively to each antenna match according to user in the frequency deviation of each antenna
As a result frequency deviation compensation is carried out, the frequency deviation is determined according to the channel estimation results；
Merging module 440 for obtaining the frequency deviation compensation post-equalization data, and carries out multiple antennas to the correction data
Merge, to generate the merging data for continuing joint-detection.
In specific application scenarios, the filter module is specifically included:
Channel estimation submodule, for according to LTE Baseband Processing Unit received each antenna base band data determine described in
The channel estimation results of each antenna；
Submodule is filtered, for generating sytem matrix according to the channel estimation results of each antenna, to each antenna data
Carry out matched filtering.
In specific application scenarios, the frequency deviation module is specifically included:
Submodule is estimated, for determining user in each day using the channel estimation results and original midamble code
The upper offset estimation value of line；
Recurrence submodule estimates the frequency deviation after recursive average for carrying out recursive average respectively to the offset estimation value
Frequency deviation of the evaluation as each antenna.
In specific application scenarios, further includes:
Secondary frequency offset compensation block, for carrying out joint-detection according to the merging data, after obtaining the joint-detection
Secondary frequency offset estimation result, and secondary frequency offset compensation is carried out according to the secondary frequency offset estimation result, obtains the secondary frequency
Secondary correction data after offset compensation, the secondary correction data are for being soft demodulated judgement.
By applying above technical scheme, by after the channel estimation results for obtaining each antenna according to channel estimation knot
Fruit carries out matched filtering processing to the data of each antenna, is then filtered respectively to each antenna match according to user in the frequency deviation of each antenna
The result of wave carries out frequency deviation compensation, finally obtains the compensated correction data of frequency deviation and carries out multiple antennas merging to correction data,
Accurate frequency can not be averagely found out by multiple antennas caused by differing greatly so as to avoid frequency deviation between each antenna of spaced antenna
The problem of inclined estimated value, improves the accuracy of offset estimation, ensure that demodulation performance.
Through the above description of the embodiments, those skilled in the art can be understood that the present invention can lead to
Hardware realization is crossed, the mode of necessary general hardware platform can also be added to realize by software.Based on this understanding, this hair
Bright technical solution can be embodied in the form of software products, which can store in a non-volatile memories
In medium (can be CD-ROM, USB flash disk, mobile hard disk etc.), including some instructions are used so that a computer equipment (can be
Personal computer, server or network equipment etc.) execute method described in each implement scene of the present invention.
It will be appreciated by those skilled in the art that the accompanying drawings are only schematic diagrams of a preferred implementation scenario, module in attached drawing or
Process is not necessarily implemented necessary to the present invention.
It will be appreciated by those skilled in the art that the module in device in implement scene can be described according to implement scene into
Row is distributed in the device of implement scene, can also be carried out corresponding change and is located at the one or more dresses for being different from this implement scene
In setting.The module of above-mentioned implement scene can be merged into a module, can also be further split into multiple submodule.
Aforementioned present invention serial number is for illustration only, does not represent the superiority and inferiority of implement scene.
Disclosed above is only several specific implementation scenes of the invention, and still, the present invention is not limited to this, Ren Heben
What the technical staff in field can think variation should all fall into protection scope of the present invention.
Claims (6)
1. a kind of frequency offset correction method characterized by comprising
After the channel estimation results for obtaining each antenna, carried out according to data of the channel estimation results to each antenna
Matched filtering processing；
Determine user in the frequency deviation of each antenna according to the channel estimation results；
Frequency deviation compensation is carried out to the result of each antenna match filtering respectively in the frequency deviation of each antenna according to user, it is described
Frequency deviation is determined according to the channel estimation results；
Obtain the compensated correction data of the frequency deviation, and multiple antennas merging carried out to the correction data, with generate for after
The continuous merging data for carrying out joint-detection；
Joint-detection is carried out according to the merging data；
Secondary frequency offset estimation result after obtaining the joint-detection, and secondary frequency is carried out according to the secondary frequency offset estimation result
Offset compensation；
Secondary correction data after obtaining the secondary frequency offset compensation, the secondary correction data are for being soft demodulated judgement.
2. the method as described in claim 1, which is characterized in that according to the channel estimation results to the data of each antenna
Matched filtering processing is carried out, specifically:
According to LTE Baseband Processing Unit the base band data of received each antenna determine the channel estimation results of each antenna；
Sytem matrix is generated according to the channel estimation results of each antenna, matched filtering is carried out to each antenna data.
3. the method as described in claim 1, which is characterized in that determine user in each day according to the channel estimation results
The frequency deviation of line, specifically:
Determine user in the upper offset estimation value of each antenna using the channel estimation results and original midamble code；
Recursive average is carried out respectively to the offset estimation value, using the offset estimation value after recursive average as each antenna
Frequency deviation.
4. a kind of frequency offset correction equipment characterized by comprising
Filter module, for after the channel estimation results for obtaining each antenna, according to the channel estimation results to described each
The data of antenna carry out matched filtering processing；
Frequency deviation module, for determining user in the frequency deviation of each antenna according to the channel estimation results；
Compensating module, for being carried out respectively to the result of each antenna match filtering according to user in the frequency deviation of each antenna
Frequency deviation compensation, the frequency deviation is determined according to the channel estimation results；
Merging module for obtaining the frequency deviation compensation post-equalization data, and carries out multiple antennas merging to the correction data, with
Generate the merging data for continuing joint-detection；
Secondary frequency offset compensation block, for carrying out joint-detection according to the merging data, two after obtaining the joint-detection
Secondary frequency offset estimation result, and secondary frequency offset compensation is carried out according to the secondary frequency offset estimation result, it obtains the secondary frequency deviation and mends
Secondary correction data after repaying, the secondary correction data are for being soft demodulated judgement.
5. equipment as claimed in claim 4, which is characterized in that the filter module specifically includes:
Channel estimation submodule, for according to LTE Baseband Processing Unit the base band data of received each antenna determine each day
The channel estimation results of line；
Submodule is filtered, for generating sytem matrix according to the channel estimation results of each antenna, each antenna data is carried out
Matched filtering.
6. equipment as claimed in claim 4, which is characterized in that the frequency deviation module specifically includes:
Submodule is estimated, for determining user in each antenna using the channel estimation results and original midamble code
On offset estimation value；
Recurrence submodule, for carrying out recursive average respectively to the offset estimation value, by the offset estimation value after recursive average
Frequency deviation as each antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510055835.1A CN104639479B (en) | 2015-02-03 | 2015-02-03 | A kind of frequency offset correction method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510055835.1A CN104639479B (en) | 2015-02-03 | 2015-02-03 | A kind of frequency offset correction method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104639479A CN104639479A (en) | 2015-05-20 |
| CN104639479B true CN104639479B (en) | 2019-02-26 |
Family
ID=53217806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510055835.1A Active CN104639479B (en) | 2015-02-03 | 2015-02-03 | A kind of frequency offset correction method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104639479B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106571860A (en) * | 2015-10-10 | 2017-04-19 | 中兴通讯股份有限公司 | Uplink data channel multi-antenna combining method and apparatus |
| CN105577599A (en) * | 2015-12-28 | 2016-05-11 | 宜宾学院 | Low complexity frequency offset compensation method in distributed antenna OFDM (Orthogonal Frequency Division Multiplexing) system |
| CN107370698B (en) * | 2016-05-13 | 2021-11-30 | 中兴通讯股份有限公司 | Downlink signal processing method, device and base station |
| WO2018120462A1 (en) * | 2016-12-29 | 2018-07-05 | 华为技术有限公司 | Antenna group switching method and related device thereof |
| CN113055995B (en) * | 2019-12-26 | 2023-10-27 | 中兴通讯股份有限公司 | Frequency offset estimation method and device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101304399A (en) * | 2008-04-17 | 2008-11-12 | 北京邮电大学 | Method and equipment for multi-frequency deviation carrier synchronization and channel evaluation |
| CN101494491A (en) * | 2009-03-04 | 2009-07-29 | 北京邮电大学 | Method and apparatus for processing acceptance signal of multiaerial system |
| CN102783107A (en) * | 2012-05-23 | 2012-11-14 | 华为技术有限公司 | Method and device for correcting frequency offset |
| CN103441966A (en) * | 2013-08-30 | 2013-12-11 | 电子科技大学 | Distributed MIMO frequency offset and channel estimation based on ECM under high speed |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100403657C (en) * | 2004-05-25 | 2008-07-16 | 大唐移动通信设备有限公司 | TD-SCDMA system frequency offset compensating method and apparatus based on exercising sequence |
| CN100356704C (en) * | 2004-06-02 | 2007-12-19 | 大唐移动通信设备有限公司 | Method for compensating frequency offset in wireless mobile communication system |
| CN101282553B (en) * | 2007-04-05 | 2011-05-18 | 大唐移动通信设备有限公司 | Method for improving combined detection performance, baseband signal processor and base station |
-
2015
- 2015-02-03 CN CN201510055835.1A patent/CN104639479B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101304399A (en) * | 2008-04-17 | 2008-11-12 | 北京邮电大学 | Method and equipment for multi-frequency deviation carrier synchronization and channel evaluation |
| CN101494491A (en) * | 2009-03-04 | 2009-07-29 | 北京邮电大学 | Method and apparatus for processing acceptance signal of multiaerial system |
| CN102783107A (en) * | 2012-05-23 | 2012-11-14 | 华为技术有限公司 | Method and device for correcting frequency offset |
| CN103441966A (en) * | 2013-08-30 | 2013-12-11 | 电子科技大学 | Distributed MIMO frequency offset and channel estimation based on ECM under high speed |
Non-Patent Citations (1)
| Title |
|---|
| 分布式MIMO信号检测技术研究;胡宇;《中国优秀硕士学位论文全文数据库信息科技辑》;20110715(第7期);正文第2.3节，图2.4 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104639479A (en) | 2015-05-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104639479B (en) | A kind of frequency offset correction method and apparatus | |
| CN107171749B (en) | Method for determining Doppler shift of radio signal directly reflected by moving object | |
| CN103024765B (en) | A kind of method and base station detecting interference base station | |
| US11506745B2 (en) | Vehicular self-positioning | |
| JP4283805B2 (en) | Noise power estimation method and noise power estimation apparatus | |
| BRPI9906840B1 (en) | delay estimation unit, receiver, and process for estimating delays | |
| CN104185201B (en) | A kind of self-adapting regulation method and device in nearby region measurement period | |
| CN109672635B (en) | Time domain correlation estimation method, device and equipment | |
| US20160302035A1 (en) | Location estimation within a wireless mesh network utilizing wireless signal signatures | |
| US20200145790A1 (en) | Positioning correction method and apparatus | |
| EP3958593A1 (en) | Wireless positioning method, positioning apparatus, and network device | |
| CN101420248B (en) | Method and device for frequency bias estimation of TD-SCDMA terminal | |
| CN108700643A (en) | The positioning of mobile device | |
| CN103987117A (en) | Signal transmitting station locating method based on mobile terminal monitoring | |
| CN105763269A (en) | Method for calibrating antenna and calibration signal processing device and system | |
| US10250320B2 (en) | Satellite signal strength indication and reflection detection | |
| CN105531600B (en) | Time analysis in wireless network for user velocity estimation | |
| CN100589334C (en) | Co-channel adjacent cell channel estimating method at the time of multi-cell union detection in TD SCDMA system | |
| CN202721698U (en) | Successive interference cancellation joint detection apparatus | |
| CN103475395A (en) | Antenna correction method, device and system | |
| CN104614725B (en) | Scanning synthetic aperture radar image quality improving method and device | |
| CN104980184A (en) | Method and equipment for cell search of TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system | |
| US20160365991A1 (en) | Method and System for Performing Optimized Channel Estimation | |
| CN105766035B (en) | Control phase locked methods, devices and systems | |
| CN114679356B (en) | Channel full-dimension parameter extraction method, device and storage medium independent of likelihood function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |