CN102377474B - A kind of mobile terminal Doppler frequency shift method of adjustment and device - Google Patents
A kind of mobile terminal Doppler frequency shift method of adjustment and device Download PDFInfo
- Publication number
- CN102377474B CN102377474B CN201010253197.1A CN201010253197A CN102377474B CN 102377474 B CN102377474 B CN 102377474B CN 201010253197 A CN201010253197 A CN 201010253197A CN 102377474 B CN102377474 B CN 102377474B
- Authority
- CN
- China
- Prior art keywords
- frequency shift
- doppler frequency
- time
- beacon channel
- moment
- 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
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses the method for a kind of mobile terminal Doppler frequency shift adjustment, the Doppler frequency shift that mathematic interpolation between the theoretical moment that this beacon channel that actual moment that UE utilizes beacon channel to occur and precalculating obtains should occur is caused because UE moves, and according to the working carrier frequency of the Doppler frequency shift adjustment UE calculated.The invention also discloses a kind of Doppler frequency shift adjusting device, comprise, beacon channel detection module, timing computing module, timing offset computing module, Doppler frequency shift computing module and carrier frequency adjusting module.Technical scheme of the present invention utilizes the beacon channel obtained in advance to answer time of occurrence to calculate because UE moves the Doppler frequency shift caused with the difference of the actual time occurred, effectively reduce the complexity of Doppler frequency shift computational process, simplify the implementation of UE Doppler frequency shift adjustment, improve system effectiveness.
Description
Technical field
The present invention relates to mobile communication terminal (being called for short, UE) frequency adjustment technology, the Doppler frequency shift being related specifically to a kind of mobile communication terminal causes method of adjustment and device.
Background technology
In moving communicating field, due to the high-speed mobile of UE, the frequency that base station can be caused to send and the actual deviation receiving frequency of UE are exactly Doppler frequency shift.Due to the direction of UE movement and the speed of movement indefinite, then the frequency departure observed of mobile terminal is also different.
The computing formula of Doppler frequency shift is, f
d=f
0(1+v
1cos (α)/u), f
dwith f
0difference be Doppler frequency shift; Wherein, f
dthe wireless carrier frequency received for UE is actual, f
0the wireless carrier frequency that base station sends, v
1the speed of UE movement, α
1be the angle between UE moving direction and UE to direction, base station, u is radio wave transmissions speed.
Under table 1 gives two scenario, the degree of maximum Doppler frequency shift.
Table 1
There is deviation in the carrier frequency that Doppler frequency shift can cause UE receiver to receive, thus cause the error rate to improve, link performance declines, particularly when UE high-speed mobile, this impact is more obvious, in 2 scenes of 3gpp set by high ferro, the speed of a motor vehicle is respectively 300km/h and 350km/h, for specifying unification mutually with 3gpp, in moving communicating field using selected 300km/h and 350km/h as the typical rate 350km/h of High-speed Circumstance and 300km/h, consider the 430km/h speed of a motor vehicle under extreme case.As shown in table 1, in 350 kilometers of scenes 1 hourly, the maximum Doppler frequency shift of UE can reach 648Hz, in 300 kilometers of scenes 2 hourly, Doppler frequency shift also reaches 555Hz, and therefore, UE must adjust the frequency deviation that Doppler frequency shift produces when Received signal strength.
In mobile communication system, UE can obtain by the broadcast message detecting or understand community content that some specific physical layer channel of air interface are transmitted in advance, and the moment that these specific physical layer channel specifically occur, these channels are referred to as beacon channel, typical beacon channel comprises Time Division-Synchronous Code Division Multiple Access and (is called for short, TD-SCDMA) Page Indication Channel of system (is called for short, PICH), Common Control Channel (is called for short, PCCPCH), descending pilot frequency time slot (is called for short, DwPTS) and Long Term Evolution (be called for short, LTE) reference signal of system (is called for short, RS) etc., the feature of beacon channel is, its time interval occurred is fixing interval T, to different mobile communication system, the occurrence of T is different, but to same mobile communication system, the value of T is fixing, like this, UE just can calculate current time T0 in advance after the theoretical time that occurs of each time of this beacon channel.
(be called for short according to CCSA's TD-SCDMA/WCDMA industry standard group in 2009, WG9 group) No. 509 manuscripts " in TC5-WG9-2009-509B-ZTE-TD high speed-high-speed motion wireless transmission key technology research report (exposure draft) " in description, give the estimation algorithm algorithm of Doppler frequency shift conventional at present, its taproot thought is exactly the training sequence code (abbreviation that mobile terminal calculates actual channel, midamble) phase difference, difference on the frequency is estimated again by phase difference, this method is equally applicable to mobile terminal and carries out Doppler frequency shift, specific implementation there are two kinds of modes.
Mode one, the frequency deviation estimating method based on data field:
1, mobile terminal carries out joint-detection in downstream data channel, obtains estimation A (n) of the symbol sebolic addressing that network sends.The signal model of A (n) is as follows:
A(n)＝B(n)·e
jω(n)+v(n)
In above formula, B (n) represents the symbol sebolic addressing that network sends; ω (n) represents because Doppler frequency shift causes the Doppler phase shift that the n-th symbol superposes; V (n) represents the noise that the n-th symbol superposes.
2, hard decision is carried out to estimation A (n) of symbol sebolic addressing, obtain hard decision sequence C (n).Phase difference between estimation A (n) of symbol sebolic addressing sent according to network and hard decision sequence C (n)
the Doppler frequency-shift of UE can be extrapolated.This phase difference D (n) is the estimated value of ω (n).
3, the Doppler shift compensation of symbol level is carried out in estimation A (n) receiving Internet symbolic sequence to this mobile terminal.
Mode two, the frequency deviation estimating method based on Midamble code:
The Doppler frequency-shift of UE can be calculated according to the chip-spaced between the phase difference between the channel estimating of adjacent two subframes and adjacent two subframes.Certainly, other can also be adopted based on the frequency deviation estimating method of Midamble code.
The Doppler shift compensation of symbol level is carried out in estimation A (n) receiving Internet symbolic sequence to this mobile terminal.
As can be seen from said method, the computation complexity that there is estimation of Doppler frequency displacement when prior art carries out Doppler frequency shift adjustment is too large, the problem that efficiency is lower.
Summary of the invention
In view of this, the present invention proposes a kind of mobile terminal Doppler frequency shift method of adjustment, calculate simply to provide a kind of, the method for the adjustment Doppler frequency shift that efficiency is higher.
Technical scheme of the present invention is:
1, UE calculates the theoretical moment Tn that beacon channel occurs for n-th time after current time T0;
2, the actual moment T ' that after UE detection T0, this beacon channel occurs for n-th time
n;
3, UE calculates T '
nand the difference DELTA T between the time of Tn;
4, UE calculates Doppler frequency shift between wireless carrier frequency that the actual wireless carrier frequency that receives of UE and base station send according to Δ T;
Described computational methods are,
wherein, described Δ f is Doppler frequency shift, described f
0for the wireless carrier frequency that base station sends;
5, UE adjusts the working carrier frequency of UE according to the Δ f calculated;
Wherein, described n >=1.
Described beacon channel is the PCCPCH channel of TD-SCDMA mobile communication system.
Described beacon channel is the DwPTS of TD-SCDMA mobile communication system.
Described beacon channel is the reference signal of LTE system.
Described beacon channel is the PICH channel of TD-SCDMA mobile communication system.
Described UE calculates the theoretical moment Tn that beacon channel occurs for n-th time after current time T0 and comprises further:
UE detects described beacon channel in the T0 moment, calculates the theoretical moment Tn that described beacon channel occurs for n-th time after the T0 moment;
Described computational methods are, Tn=T0+nT;
Wherein, described T is the time interval that described beacon channel occurs.
Described UE calculates the theoretical moment Tn that beacon channel occurs for n-th time after current time T0 and comprises further:
UE understands system message, obtains the position of PICH channel appearance next time;
The theoretical moment Tn that UE occurs for n-th time according to PICH channel after the position acquisition T0 moment of PICH channel appearance next time;
Described computational methods are, Tn=T1+ (n-1) T;
Wherein, described T1 for understand system message obtain PICH channel next time occur position; Described T is the time interval that PICH channel occurs.
The invention also discloses a kind of mobile terminal Doppler frequency shift adjusting device, comprising:
Beacon channel detection module, concurrent the sending of actual moment detecting beacon channel appearance is carved into described timing offset computing module described actual time;
Timing computing module, calculates the theoretical time Tn of described beacon channel n-th appearance after current time T0 and sends to described timing offset computing module;
Timing offset computing module, the actual moment T ' that the described beacon channel that after calculating T0, described beacon channel detection module detects occurs for n-th time
nand the difference DELTA T between described Tn, sends Δ T to described Doppler frequency shift computing module;
Doppler frequency shift computing module, calculates Doppler frequency shift according to described Δ T and is sent to carrier frequency adjusting module;
Carrier frequency adjusting module, adjusts according to the working carrier frequency of Doppler frequency shift to UE that described Doppler frequency shift computing module calculates.
Wherein, described n >=1.
The method that described Doppler frequency shift computing module calculates Doppler frequency shift is:
Wherein, described Δ f is Doppler frequency shift, described f
0for the wireless carrier frequency that base station sends.
The feature that technical scheme of the present invention utilizes beacon channel transmission time interval fixing, can obtain because UE moves the Doppler frequency shift caused by the difference between the theoretical time of reception of beacon channel and actual time of reception through simply calculating, effectively reduce mobile terminal in Doppler frequency shift adjustment process and calculate the algorithm complex of Doppler frequency shift, simplify the implementation of UE Doppler frequency shift adjustment, improve system effectiveness.
Accompanying drawing explanation
Fig. 1 is prior art mobile terminal Doppler frequency shift method of adjustment flow chart
Fig. 2 is preferred embodiment for the present invention flow chart
Fig. 3 is the specific embodiment of the invention 4 Doppler frequency shift adjusting device structure chart
Embodiment
For further illustrating technical scheme of the present invention, providing specific embodiment below and being described with reference to the accompanying drawings.
Specific embodiment 1
The present embodiment is a kind of preferred implementation of the inventive method in TD-SCDMA mobile communication system, and overall procedure as shown in Figure 2.
1, UE calculates the theoretical moment Tn that beacon channel occurs for n-th time after current time T0;
The beacon channel used in the present embodiment is PCCPCH channel;
UE detects PCCPCH channel in the T0 moment, calculates the theoretical moment Tn that PCCPCH channel occurs for n-th time after the T0 moment;
Tn＝T0+nT
The time interval T that PCCPCH occurs at every turn is TD-SCDMA wireless sub-frame, i.e. a 5ms, Tn=(T0+5n) ms that this step calculates; Described n be more than or equal to 1 integer;
2, the actual moment T ' that after UE detection T0, this beacon channel occurs for n-th time
n;
The PCCPCH occurred for n-th time after UE detects the T0 moment, obtains actual time of reception T '
n;
In the present embodiment, the method that this step obtains Tn ' is, UE uses the training sequence that known configuration is good (to be called for short, midamble) with in a fixing search window, carry out correlation computations with the reception data that fixing step-length intercepts, correlation best moment is exactly the moment T ' that PCCPCH channel occurs
n;
3, UE calculates T '
nand the difference DELTA T=T ' between the time of Tn
n-Tn;
4, UE calculates Doppler frequency shift between wireless carrier frequency that the actual wireless carrier frequency that receives of UE and base station send according to Δ T;
Described computational methods are,
Calculate the movement speed v of UE relative to direction, base station
1cos (α)
v
1cos(α)＝(ΔT/nT)×u
Calculate the carrier frequency f that UE receives
d
f
d＝f
0(1+v
1cos(α)/u)＝f
0(1+ΔT/nT)
Calculate UE and move caused Doppler frequency shift Δ f
5, UE adjusts the working carrier frequency of UE according to the Δ f calculated.
Specific embodiment 2
The present embodiment is a kind of preferred implementation of the inventive method in LTE mobile communication system, and overall procedure as shown in Figure 2.
1, UE calculates the theoretical moment Tn that beacon channel occurs for n-th time after current time T0;
The RS that the beacon channel used in the present embodiment is LTE system;
UE detects RS in the T0 moment, calculates the theoretical moment Tn that RS occurs for n-th time after the T0 moment;
Tn＝T0+nT
The time interval T that the RS of LTE system often vigorously occurs is a LTE wireless sub-frame, and the length of LTE wireless sub-frame is 1ms, Tn=(T0+n) ms that this step calculates; Described n be more than or equal to 1 integer;
2, the actual moment T ' that after UE detection T0, this beacon channel occurs for n-th time
n;
The RS occurred for n-th time after UE detects the T0 moment, obtains actual time of reception T '
n;
3, UE calculates T '
nand the difference DELTA T=T ' between the time of Tn
n-Tn;
UE calculates the Doppler frequency shift between the wireless carrier frequency that the actual wireless carrier frequency that receives of UE and base station send according to Δ T;
Described computational methods are,
Calculate the movement speed v of UE relative to direction, base station
1cos (α)
v
1cos(α)＝(ΔT/nT)×u
Calculate the carrier frequency f that UE receives
d
f
d＝f
0(1+v
1cos(α)/u)＝f
0(1+ΔT/nT)
Calculate UE and move caused Doppler frequency shift Δ f
5, UE adjusts the working carrier frequency of UE according to the Δ f calculated.
Specific embodiment 3
The present embodiment is a kind of preferred implementation of the inventive method in TD-SCDMA mobile communication system, and overall procedure as shown in Figure 2.
1, UE calculates the theoretical moment Tn that beacon channel occurs for n-th time after current time T0;
The beacon channel used in the present embodiment is PICH channel;
UE understands system message, obtains the position T1 of PICH channel appearance next time;
The theoretical moment Tn that after UE calculating current time T0, PICH channel occurs for n-th time;
Described computational methods are, Tn=T1+ (n-1) T;
Wherein, described T is the time interval that PICH channel occurs; Described n be more than or equal to 1 integer;
2, the actual moment T ' that this beacon channel that UE occurs for n-th time after detecting T0 occurs
n;
The PICH occurred for n-th time after UE detects the T0 moment, obtains actual time of reception T '
n;
3, UE calculates T '
nand the difference DELTA T=T ' between the time of Tn
n-Tn;
4, UE calculates Doppler frequency shift between wireless carrier frequency that the actual wireless carrier frequency that receives of UE and base station send according to Δ T;
Described computational methods are,
Calculate the movement speed v of UE relative to direction, base station
1cos (α)
v
1cos(α)＝(ΔT/Tn-T0)×u
Calculate the carrier frequency f that UE receives
d
f
d＝f
0(1+v
1cos(α)/u)＝f
0(1+ΔT/nT)
Calculate UE and move caused Doppler frequency shift Δ f
5, UE adjusts the working carrier frequency of UE according to the Δ f calculated.
Specific embodiment 4
The present embodiment is a kind of preferred implementation of Doppler frequency shift adjusting device of the present invention, and concrete structure as shown in Figure 3, comprising:
Beacon channel detection module, concurrent the sending of actual moment detecting beacon channel appearance is carved into described timing offset computing module described actual time;
Timing computing module, calculates the theoretical time Tn of described beacon channel n-th appearance after current time T0 and sends to described timing offset computing module;
Timing offset computing module, the actual moment T ' that the described beacon channel that after calculating T0, described beacon channel detection module detects occurs for n-th time
nand the difference DELTA T between described Tn, sends Δ T to described Doppler frequency shift computing module;
Doppler frequency shift computing module, calculates Doppler frequency shift according to described Δ T and is sent to carrier frequency adjusting module;
In the present embodiment, the method that described Doppler frequency shift computing module calculates Doppler frequency shift is:
Wherein, described Δ f is Doppler frequency shift, described f
0for the wireless carrier frequency that base station sends.Carrier frequency adjusting module, adjusts according to the working carrier frequency of Doppler frequency shift to UE that described Doppler frequency shift computing module calculates; Described n be more than or equal to 1 integer;
Carrier frequency adjusting module, adjusts the working carrier frequency of UE according to Δ f.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (8)
1. a mobile terminal Doppler frequency shift method of adjustment, is characterized in that, comprising:
Mobile terminal UE calculates the theoretical moment Tn that beacon channel occurs for n-th time after current time T0;
The actual moment T ' that after UE detection T0, this beacon channel occurs for n-th time
n;
UE calculates T '
nand the difference DELTA T between the time of Tn;
UE calculates the Doppler frequency shift between the wireless carrier frequency that the actual wireless carrier frequency that receives of UE and base station send according to Δ T;
Described computational methods are,
wherein, described Δ f is Doppler frequency shift, described f
0for the wireless carrier frequency that base station sends;
UE adjusts the working carrier frequency of UE according to the Δ f calculated;
Wherein, described n >=1.
2. a kind of mobile terminal Doppler frequency shift method of adjustment according to claim 1, is characterized in that, described beacon channel is the Common Control Channel PCCPCH of TD-SCDMA mobile communication system.
3. a kind of mobile terminal Doppler frequency shift method of adjustment according to claim 1, is characterized in that, described beacon channel is the descending pilot frequency time slot DwPTS of TD-SCDMA mobile communication system.
4. a kind of mobile terminal Doppler frequency shift method of adjustment according to claim 1, is characterized in that, described beacon channel is the reference signal RS of LTE system.
5. a kind of mobile terminal Doppler frequency shift method of adjustment according to claim 1, is characterized in that, described beacon channel is the Page Indication Channel PICH of TD-SCDMA mobile communication system.
6. a kind of mobile terminal Doppler frequency shift method of adjustment according to any one of Claims 1 to 5, is characterized in that, described UE calculates the theoretical moment Tn that beacon channel occurs for n-th time after current time T0 and comprises:
UE detects described beacon channel in the T0 moment, calculates the theoretical moment Tn that described beacon channel occurs for n-th time after the T0 moment;
Described computational methods are, Tn=T0+nT;
Wherein, described T is the time interval that described beacon channel occurs.
7. a kind of mobile terminal Doppler frequency shift method of adjustment according to claim 5, is characterized in that, described UE calculates the theoretical moment Tn that beacon channel occurs for n-th time after current time T0 and comprises:
UE understands system message, obtains the position of PICH channel appearance next time;
The theoretical moment Tn that UE occurs for n-th time according to PICH channel after the position acquisition T0 moment of PICH channel appearance next time;
Described computational methods are, Tn=T1+ (n-1) T;
Wherein, described T1 for understand system message obtain PICH channel next time occur position; Described T is the time interval that PICH channel occurs.
8. a Doppler frequency shift adjusting device, is characterized in that, comprising:
Beacon channel detection module, detects the actual moment that beacon channel occurs and concurrently send be carved into timing offset computing module described actual time;
Timing computing module, calculates the theoretical time Tn of described beacon channel n-th appearance after current time T0 and sends to described timing offset computing module;
Timing offset computing module, the actual moment T ' that the described beacon channel that after calculating T0, described beacon channel detection module detects occurs for n-th time
nand the difference DELTA T between described Tn, sends Δ T to described Doppler frequency shift computing module;
Doppler frequency shift computing module, calculates Doppler frequency shift according to described Δ T and is sent to carrier frequency adjusting module; Described computational methods are,
wherein, described Δ f is Doppler frequency shift, described f
0for the wireless carrier frequency that base station sends;
Carrier frequency adjusting module, adjusts according to the working carrier frequency of Doppler frequency shift to UE that described Doppler frequency shift computing module calculates;
Wherein, described n >=1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010253197.1A CN102377474B (en) | 2010-08-13 | 2010-08-13 | A kind of mobile terminal Doppler frequency shift method of adjustment and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010253197.1A CN102377474B (en) | 2010-08-13 | 2010-08-13 | A kind of mobile terminal Doppler frequency shift method of adjustment and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102377474A CN102377474A (en) | 2012-03-14 |
| CN102377474B true CN102377474B (en) | 2015-12-02 |
Family
ID=45795537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010253197.1A Active CN102377474B (en) | 2010-08-13 | 2010-08-13 | A kind of mobile terminal Doppler frequency shift method of adjustment and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102377474B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106341357B (en) * | 2015-07-07 | 2020-04-03 | 中国移动通信集团公司 | Downlink frequency offset compensation method and device |
| CN111371713B (en) * | 2018-12-25 | 2022-10-14 | 深圳市中兴微电子技术有限公司 | Method for resisting Doppler frequency shift and related equipment |
| CN112040541B (en) * | 2020-09-15 | 2023-06-20 | Oppo广东移动通信有限公司 | Frequency adjustment method, device, terminal and storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101039125A (en) * | 2006-03-16 | 2007-09-19 | 湖北众友科技实业股份有限公司 | Method and system of frequency deviation measurement for testing TD-SCDMA terminal |
| CN101268630A (en) * | 2005-07-20 | 2008-09-17 | 高通股份有限公司 | Method and apparatus for supporting timing and/or frequency corrections in a wireless communications system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08511664A (en) * | 1993-06-07 | 1996-12-03 | アルカテル・モビル・フオンズ | Signal packet for a communication system having a reference modulated according to a time-dependent law |
| US8798638B2 (en) * | 2005-07-20 | 2014-08-05 | Qualcomm Incorporated | Methods and apparatus for providing base station position information and using position information to support timing and/or frequency corrections |
-
2010
- 2010-08-13 CN CN201010253197.1A patent/CN102377474B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101268630A (en) * | 2005-07-20 | 2008-09-17 | 高通股份有限公司 | Method and apparatus for supporting timing and/or frequency corrections in a wireless communications system |
| CN101039125A (en) * | 2006-03-16 | 2007-09-19 | 湖北众友科技实业股份有限公司 | Method and system of frequency deviation measurement for testing TD-SCDMA terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102377474A (en) | 2012-03-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11363554B2 (en) | Frequency correction in a multi-carrier communication system | |
| CN101938444B (en) | Method and device for estimating and correcting frequency offset of orthogonal frequency division multiplexing system | |
| CN102223322B (en) | Estimation method and apparatus for frequency offset | |
| CN101958744B (en) | Method and device for pre-calibrating frequency deviation | |
| CN101567708B (en) | Frequency offset compensation method and device | |
| CN108566266B (en) | Reliable transmission method and device for broadband private network under high-speed mobile channel | |
| JP2012531848A (en) | Time offset estimation apparatus and method for orthogonal frequency division multiplexing system | |
| CN1674467A (en) | Data transmitting method in short-distance radio network | |
| US8145272B2 (en) | Pilot-based two-dimensional channel estimation | |
| WO2013066260A2 (en) | Method and apparatus for estimating speed of a mobile terminal | |
| JP5219528B2 (en) | Radio receiving apparatus and radio receiving method | |
| CN1913396B (en) | Single/multiple carrier compatible digital broadcast system communication method | |
| CN102377474B (en) | A kind of mobile terminal Doppler frequency shift method of adjustment and device | |
| CN101990291A (en) | Method for pre-compensating frequency bias as well as device | |
| CN106685869B (en) | Frequency offset compensation method and related device | |
| CN102868660A (en) | Downlink transmission synchronization method based on broadband wireless communication system | |
| CN101789807B (en) | Frequency deviation evaluation method, device and communication device | |
| CN101599794B (en) | TD-SCDMA communication system frequency synchronization method and device | |
| CN100544333C (en) | Frequency deviation estimating method in the mobile communication system and device | |
| CN101674281A (en) | Pilot frequency pattern design method based on channel environment judgment | |
| CN101110807B (en) | Fractional carrier frequency offset estimator and method of estimating fractional carrier frequency offset between transmitter and receiver | |
| CN101515826B (en) | Method and device for generating self-adapting time slot without cyclic prefix of data symbol | |
| CN101630961B (en) | Frequency bias estimation equipment, method and communication device | |
| CN102316506A (en) | Method and equipment for determining speed range of mobile station | |
| CN102185627B (en) | Frequency calibrating method and device under TD-SCDMA mode |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170427 Address after: Nanping Street 400060 Chongqing Nan'an District Nancheng Road No. 199 left attached to the floor 403 Patentee after: Keen (Chongqing) Microelectronics Technology Co., Ltd. Address before: 400065 Chongqing Nan'an District huangjuezhen pass Chongqing University of Posts and Telecommunications shineford building 12 floor 1205 Patentee before: Chongqing City Communication & Technology Co., Ltd. |
|
| TR01 | Transfer of patent right |