CN104735011A - Device and method for sample frequency deviation robust estimation in complex channel environment - Google Patents
Device and method for sample frequency deviation robust estimation in complex channel environment Download PDFInfo
- Publication number
- CN104735011A CN104735011A CN201310723480.XA CN201310723480A CN104735011A CN 104735011 A CN104735011 A CN 104735011A CN 201310723480 A CN201310723480 A CN 201310723480A CN 104735011 A CN104735011 A CN 104735011A
- Authority
- CN
- China
- Prior art keywords
- sampling frequency
- frequency deviation
- module
- channel environment
- robust estimation
- 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
Landscapes
- Synchronisation In Digital Transmission Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a device and method for sample frequency deviation robust estimation in a complex channel environment. Firstly, cyclic convolution operation is carried out on module values of two adjacent time domain channel impulse responses; then the position of the maximum value of cyclic convolution results is found; a sample frequency deviation is estimated according to the position of the maximum value of the cyclic convolution results, and the sample frequency deviation is estimated in a robust mode in the complex channel environment. In particular, as for OFDM systems like a CMMB, hardware resources can be reused, the achievement complexity is reduced accordingly, the ship area is reduced, and the achievement cost is reduced.
Description
Technical field
The present invention relates to digital communication technology, particularly relate to a kind of device and method for Robust Estimation sampling frequency deviation under Complex Channel environment.
Background technology
Sampling frequency offset refers to the clock of receiver and the deviation of transmitter clock frequency.Normally cause by the crystal oscillator resonance frequency that uses in receiver is inaccurate.The existence of sampling frequency offset can affect the performance of receiver, even can cause working time serious.On the other hand, the order of accuarcy of crystal oscillator resonance frequency is relevant with the machining accuracy of crystal, and frequency accuracy requires higher higher to crystal pro cessing precision, and what bring thus is high cost.Therefore physical end equipment adopts the crystal that comparatively cheap machining accuracy is not high usually, thus reduces BOM (BOM) cost outside chip, but proposes higher requirement to the sampling frequency offset correction capability of terminal equipment like this.
Usually, two kinds of processing modes are had:
1) according to the modulus value of adjacent twice time domain channel impulse response (can estimate to obtain by targeting sequencing coarse channel), the side-play amount of most powerful path position can be got to estimate sampling frequency offset, as shown in Figure 1.Direction (be in advance or delayed) according to skew can know that sample frequency is bigger than normal or less than normal; The concrete numerical value of sampling frequency deviation can be estimated according to the size of side-play amount.
But, due to ground-based wireless transmissions circumstance complication changeable (especially in city), particularly at CMMB (ChinaMobile Multimedia Broadcasting, China Mobile multimedia broadcasting television system) in, because adopt SFN (single frequency network) mode to arrange net, receiver may receive the signal from the close cell site of multiple intensity or repeater station simultaneously, as shown in Figure 2.In addition, for the mobile communication receiving system as CMMB, channel can change in time, and therefore the change of most powerful path position also likely occurs in adjacent twice time domain channel impulse response, as shown in Figure 3.Under these Complex Channel environment, if still adopt most powerful path position, the change of the most powerful path position of channel self can be thought by mistake be caused by sampling frequency deviation, cause sampling frequency deviation misjudgment, whole receiver cannot normally be worked.
2) if system is homology clock, namely make a start and the sampling clock of AD device of receiving end and LO(local oscillator) signal all comes from the frequency multiplication in same crystal oscillator source, then can obtain sampling frequency offset according to the carrier wave frequency deviation of data acquisition.
Terrestrial broadcast system, most at present, RF Tuner has independent clock (if Sharp CAN tuner is 4MHz crystal), is non-homogeneous clock.
This just needs a kind of device robustly estimating sampling frequency deviation under Complex Channel environment.
Summary of the invention
The technical problem to be solved in the present invention it is possible to robustly estimate sampling frequency deviation under Complex Channel environment.
For solving the problems of the technologies described above, device for Robust Estimation sampling frequency deviation under Complex Channel environment provided by the invention, first it carry out circular convolution computing to the modulus value of adjacent twice time domain channel impulse response, then the position of the maximum of circular convolution result is searched, and according to the maximum value position estimating sampling frequency departure of circular convolution result.
Preferably, for the device of Robust Estimation sampling frequency deviation under Complex Channel environment, comprise a FFT module, the 2nd FFT module, inverted order operational module, multiplier, IFFT module, search maximum module;
A described FFT module, in adjacent twice channel time domain impulse response modulus value | h1 (i) |, carry out fast fourier transform, export and be designated as C1 (i), i=0,1...N-1, N are that fast fourier transform is counted;
Described inverted order operational module, for another in adjacent twice channel time domain impulse response modulus value | h2 (i) |, export after inverted order, output is designated as | h2 (N-1-i) |;
Described 2nd FFT module, for the output to described inverted order operational module | h2 (N-1-i) |, carry out fast fourier transform, export and be designated as C2 (i);
Described multiplier, for output C1 (i) of a described FFT module being multiplied with output C2 (i) of the 2nd FFT module, exporting and being designated as C1 (i) * C2 (i);
Described IFFT module, for the result of calculation C1 (i) * C2 (i) exported by described multiplier, carry out fast adverse Fourier transform, output is designated as | h3 (i) |;
Describedly search maximum module, for the output according to described IFFT module | h3 (i) | the position of middle maximum, estimating sampling frequency departure.
Preferably, described in search maximum module, according to the output of described IFFT module | h3 (i) | in maximum position than desired value offset in advance or delayed, judge that sample frequency is bigger than normal or less than normal; According to the size of skew, estimate the concrete numerical value of sampling frequency deviation.
Preferably, the described device for Robust Estimation sampling frequency deviation under Complex Channel environment, is applied to CMMB receiving system, and the length N of channel time domain impulse response is 2048.
For solving the problems of the technologies described above, method for Robust Estimation sampling frequency deviation under Complex Channel environment provided by the invention, first circular convolution computing is carried out to the modulus value of adjacent twice time domain channel impulse response, then the maximum value position of circular convolution result is searched, and according to the maximum value position estimating sampling frequency departure of circular convolution result.
Preferably, the described method for Robust Estimation sampling frequency deviation under Complex Channel environment, comprises the following steps:
One, obtain adjacent twice channel time domain impulse response modulus value, be designated as | h1 (i) | with | h2 (i) |, wherein i=0,1...N-1, N are that fast fourier transform is counted;
Two, will | h2 (i) | export after carrying out inverted order operation, namely according to | h2 (N-1-i) | export, i=0,1...N-1;
Three, incite somebody to action | h1 (i) | with | h2 (N-1-i) | do the map function of N point fast Fourier respectively, obtain C1 (i) and C2 (i), i=0,1...N-1;
Four, to each i, i=0,1...N-1, C1 (i) is multiplied with C2 (i);
Five, the result be multiplied with C2 (i) to C1 (i) in step 4 carries out the operation of N point fast adverse Fourier transform again, obtains | h3 (i) |;
Six, search | h3 (i) | the position of middle maximum, carry out estimating sampling frequency departure in this, as reference.
Preferably, in step 6, according to | h3 (i) | the position of middle maximum than desired value offset in advance or delayed, judge that sample frequency is bigger than normal or less than normal; According to the size of skew, estimate the concrete numerical value of sampling frequency deviation.
Preferably, the described method for Robust Estimation sampling frequency deviation under Complex Channel environment, is applied to CMMB receiving system, and the length N of channel time domain impulse response is 2048.
Device and method for Robust Estimation sampling frequency deviation under Complex Channel environment of the present invention, first circular convolution computing is carried out to the modulus value of adjacent twice time domain channel impulse response, then the maximum value position of circular convolution result is searched, and estimate sampling frequency offset with this, robustly sampling frequency deviation can be estimated under Complex Channel environment, especially for picture CMMB(China Mobile Multimedia Broadcasting, China Mobile multimedia broadcasting television system) such ofdm system, IFFT module and FFT module are also for the demodulation of OFDM symbol, therefore can multiplexing hardware resource, thus reduce implementation complexity, decrease chip area, reduce and realize cost.
Accompanying drawing explanation
In order to be illustrated more clearly in technical scheme of the present invention, below the accompanying drawing that will use required for the present invention is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 be get most powerful path position under conventional channel environment side-play amount to estimate sampling frequency offset schematic diagram;
Fig. 2 receives from the close signal schematic representation of multiple intensity simultaneously;
Fig. 3 is the change schematic diagram that most powerful path position occurs in adjacent twice time domain channel impulse response;
Fig. 4 is the device one embodiment schematic diagram for Robust Estimation sampling frequency deviation under Complex Channel environment of the present invention;
Fig. 5 is that the application of installation for Robust Estimation sampling frequency deviation under Complex Channel environment of the present invention is in the schematic diagram of CMMB.
Embodiment
Below in conjunction with accompanying drawing, carry out clear, complete description to the technical scheme in the present invention, obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, other embodiments all that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belong to the scope of protection of the invention.
Embodiment one
For the device of Robust Estimation sampling frequency deviation under Complex Channel environment, first circular convolution computing is carried out to the modulus value of adjacent twice time domain channel impulse response, then the position of the maximum of circular convolution result is searched, and according to the maximum value position estimating sampling frequency departure of circular convolution result.
Preferably, for the device of Robust Estimation sampling frequency deviation under Complex Channel environment, as shown in Figure 4, comprising: FFT (fast fourier transform) module, the 2nd FFT module, inverted order operational module, multiplier, IFFT (fast adverse Fourier transform) module, search maximum module.
A described FFT module, in adjacent twice channel time domain impulse response modulus value | h1 (i) |, carry out fast fourier transform, export and be designated as C1 (i), i=0,1...N-1, N are that fast fourier transform is counted;
Described inverted order operational module, for another in adjacent twice channel time domain impulse response modulus value | h2 (i) |, export after inverted order, output is designated as | h2 (N-1-i) |;
Described 2nd FFT module, for the output to described inverted order operational module | h2 (N-1-i) |, carry out fast fourier transform, export and be designated as C2 (i);
Described multiplier, for output C1 (i) of a described FFT module being multiplied with output C2 (i) of the 2nd FFT module, exporting and being designated as C1 (i) * C2 (i);
Described IFFT module, for the result of calculation C1 (i) * C2 (i) exported by described multiplier, carry out fast adverse Fourier transform, output is designated as | h3 (i) |;
Describedly search maximum module, for the output according to described IFFT module | h3 (i) | the position of middle maximum, estimating sampling frequency departure.
Preferably, described in search maximum module, according to the output of described IFFT module | h3 (i) | in the direction (in advance or delayed) that offsets than desired value, the position of maximum, judge that sample frequency is bigger than normal or less than normal; According to the size of skew, estimate the concrete numerical value of sampling frequency deviation.
Preferably, as shown in Figure 5, for the device of Robust Estimation sampling frequency deviation under Complex Channel environment, be applied to CMMB receiving system, the length N of channel time domain impulse response is 2048.
The device for Robust Estimation sampling frequency deviation under Complex Channel environment of embodiment one, first circular convolution computing is carried out to the modulus value of adjacent twice time domain channel impulse response, then the maximum value position of circular convolution result is searched, and estimate sampling frequency offset with this, robustly sampling frequency deviation can be estimated under Complex Channel environment, especially for picture CMMB(China Mobile Multimedia Broadcasting, China Mobile multimedia broadcasting television system) such ofdm system, IFFT module and FFT module are also for the demodulation of OFDM symbol, therefore can multiplexing hardware resource, thus reduce implementation complexity, decrease chip area, reduce and realize cost.
Embodiment two
For the method for Robust Estimation sampling frequency deviation under Complex Channel environment, first circular convolution computing is carried out to the modulus value of adjacent twice time domain channel impulse response, then the maximum value position of circular convolution result is searched, and according to the maximum value position estimating sampling frequency departure of circular convolution result.
Preferably, for the method for Robust Estimation sampling frequency deviation under Complex Channel environment, comprise the following steps:
One, obtain adjacent twice channel time domain impulse response modulus value, be designated as | h1 (i) | with | h2 (i) |, wherein i=0,1...N-1, N are that fast fourier transform is counted;
Two, will | h2 (i) | export after carrying out inverted order operation, namely according to | h2 (N-1-i) | export, i=0,1...N-1;
Three, incite somebody to action | h1 (i) | with | h2 (N-1-i) | do the map function of N point fast Fourier respectively, obtain C1 (i) and C2 (i), i=0,1...N-1;
Four, to each i, i=0,1...N-1, C1 (i) is multiplied with C2 (i);
Five, the result be multiplied with C2 (i) to C1 (i) in step 4 carries out the operation of N point fast adverse Fourier transform again, obtains | h3 (i) |;
Six, search | h3 (i) | the position of middle maximum, carry out estimating sampling frequency departure in this, as reference.
Preferably, in step 6, according to | h3 (i) | direction that the position of middle maximum offsets than desired value (in advance or delayed), judges that sample frequency is bigger than normal or less than normal; According to the size of skew, estimate the concrete numerical value of sampling frequency deviation.
Preferably, for the method for Robust Estimation sampling frequency deviation under Complex Channel environment, be applied to CMMB receiving system, for CMMB receiving system, the length N of channel time domain impulse response is 2048, and the synchronizing sequence that channel time domain impulse response can be started by each time slot obtains, channel time domain impulse response modulus value has 2048 values, namely | h1 (i) | (i=0,1,2...2047).In CMMB system, whole process is as follows:
(1), obtain adjacent twice channel time domain impulse response modulus value, be designated as | h1 (i) | with | h2 (i) |, wherein i=0,1...2047;
(2), will | h2 (i) | carry out inverted order operation (namely exchange output order) and export afterwards, namely according to | h2 (2047-i) |, i=0,1...2047 export;
(3), incite somebody to action | h1 (i) | with | h2 (2047-i) | make 2048 FFT(fast fourier transform respectively) operation, obtain C1 (i) and C2 (i), i=0,1...2047;
(4), to each i, i=0,1...2047, C1 (i) is multiplied with C2 (i);
(5), to the result that C1 (i) in step (four) is multiplied with C2 (i) 2048 IFFT(fast adverse Fourier transform are carried out again) operation, obtain | h3 (i) |;
(6), search | h3 (i) | the position of middle maximum, carry out estimating sampling frequency departure in this, as reference.
Preferably, in step (six), according to the output of described IFFT module | h3 (i) | in the direction (in advance or delayed) that offsets than desired value, the position of maximum, judge that sample frequency is bigger than normal or less than normal; According to the size of skew, estimate the concrete numerical value of sampling frequency deviation.
Preferably, for the method for Robust Estimation sampling frequency deviation under Complex Channel environment, be applied to CMMB receiving system, the length N of channel time domain impulse response is 2048.
The method for Robust Estimation sampling frequency deviation under Complex Channel environment of embodiment two, first circular convolution computing is carried out to the modulus value of adjacent twice time domain channel impulse response, then the maximum value position of circular convolution result is searched, and estimate sampling frequency offset with this, robustly sampling frequency deviation can be estimated under Complex Channel environment, especially for picture CMMB(China Mobile Multimedia Broadcasting, China Mobile multimedia broadcasting television system) such ofdm system, IFFT module and FFT module are also for the demodulation of OFDM symbol, therefore can multiplexing hardware resource, thus reduce implementation complexity, decrease chip area, reduce and realize cost.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (8)
1. the device for Robust Estimation sampling frequency deviation under Complex Channel environment, it is characterized in that, first circular convolution computing is carried out to the modulus value of adjacent twice time domain channel impulse response, then the position of the maximum of circular convolution result is searched, and according to the maximum value position estimating sampling frequency departure of circular convolution result.
2. the device for Robust Estimation sampling frequency deviation under Complex Channel environment according to claim 1, is characterized in that,
For the device of Robust Estimation sampling frequency deviation under Complex Channel environment, comprise a FFT module, the 2nd FFT module, inverted order operational module, multiplier, IFFT module, search maximum module;
A described FFT module, in adjacent twice channel time domain impulse response modulus value | h1 (i) |, carry out fast fourier transform, export and be designated as C1 (i), i=0,1...N-1, N are that fast fourier transform is counted;
Described inverted order operational module, for another in adjacent twice channel time domain impulse response modulus value | h2 (i) |, export after inverted order, output is designated as | h2 (N-1-i) |;
Described 2nd FFT module, for the output to described inverted order operational module | h2 (N-1-i) |, carry out fast fourier transform, export and be designated as C2 (i);
Described multiplier, for output C1 (i) of a described FFT module being multiplied with output C2 (i) of the 2nd FFT module, exporting and being designated as C1 (i) * C2 (i);
Described IFFT module, for the result of calculation C1 (i) * C2 (i) exported by described multiplier, carry out fast adverse Fourier transform, output is designated as | h3 (i) |;
Describedly search maximum module, for the output according to described IFFT module | h3 (i) | the position of middle maximum, estimating sampling frequency departure.
3. the device for Robust Estimation sampling frequency deviation under Complex Channel environment according to claim 2, is characterized in that,
Describedly search maximum module, according to the output of described IFFT module | h3 (i) | in maximum position than desired value offset in advance or delayed, judge that sample frequency is bigger than normal or less than normal; According to the size of skew, estimate the concrete numerical value of sampling frequency deviation.
4. the device for Robust Estimation sampling frequency deviation under Complex Channel environment according to Claims 2 or 3, is characterized in that,
Be applied to CMMB receiving system, fast fourier transform points N is 2048.
5. the method for Robust Estimation sampling frequency deviation under Complex Channel environment, it is characterized in that, first circular convolution computing is carried out to the modulus value of adjacent twice time domain channel impulse response, then the maximum value position of circular convolution result is searched, and according to the maximum value position estimating sampling frequency departure of circular convolution result.
6. the method for Robust Estimation sampling frequency deviation under Complex Channel environment according to claim 5, is characterized in that, comprise the following steps:
One, obtain adjacent twice channel time domain impulse response modulus value, be designated as | h1 (i) | with | h2 (i) |, wherein i=0,1...N-1, N are that fast fourier transform is counted;
Two, will | h2 (i) | export after carrying out inverted order operation, namely according to | h2 (N-1-i) | export, i=0,1...N-1;
Three, incite somebody to action | h1 (i) | with | h2 (N-1-i) | do the map function of N point fast Fourier respectively, obtain C1 (i) and C2 (i), i=0,1...N-1;
Four, to each i, i=0,1...N-1, C1 (i) is multiplied with C2 (i);
Five, the result be multiplied with C2 (i) to C1 (i) in step 4 carries out the operation of N point fast adverse Fourier transform again, obtains | h3 (i) |;
Six, search | h3 (i) | the position of middle maximum, carry out estimating sampling frequency departure in this, as reference.
7. the method for Robust Estimation sampling frequency deviation under Complex Channel environment according to claim 6, is characterized in that,
In step 6, according to | h3 (i) | the position of middle maximum than desired value offset in advance or delayed, judge that sample frequency is bigger than normal or less than normal; According to the size of skew, estimate the concrete numerical value of sampling frequency deviation.
8. the method for Robust Estimation sampling frequency deviation under Complex Channel environment according to claim 6 or 7, is characterized in that,
Be applied to CMMB receiving system, fast fourier transform points N is 2048.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310723480.XA CN104735011B (en) | 2013-12-24 | 2013-12-24 | Device and method for Robust Estimation sampling frequency deviation under Complex Channel environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310723480.XA CN104735011B (en) | 2013-12-24 | 2013-12-24 | Device and method for Robust Estimation sampling frequency deviation under Complex Channel environment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104735011A true CN104735011A (en) | 2015-06-24 |
| CN104735011B CN104735011B (en) | 2019-01-29 |
Family
ID=53458453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310723480.XA Active CN104735011B (en) | 2013-12-24 | 2013-12-24 | Device and method for Robust Estimation sampling frequency deviation under Complex Channel environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104735011B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101014031A (en) * | 2007-02-13 | 2007-08-08 | 鼎芯通讯（上海）有限公司 | Frequency coarse synchronizing method |
| WO2007148267A1 (en) * | 2006-06-20 | 2007-12-27 | Nxp B.V. | Method and apparatus for estimating carrier frequency offset |
| KR100882880B1 (en) * | 2007-08-23 | 2009-02-09 | 전자부품연구원 | Channel estimation system on the basis of be simplified dft for ofdm system and the method thereof |
| CN101567868A (en) * | 2008-04-25 | 2009-10-28 | 中兴通讯股份有限公司 | Decimal frequency deviation estimation method of CMMB cellphone television |
| CN101764780A (en) * | 2009-12-28 | 2010-06-30 | 北京中星微电子有限公司 | Method and system for time and frequency synchronization in orthogonal frequency division multiplexing |
| CN101902426A (en) * | 2009-05-27 | 2010-12-01 | 中兴通讯股份有限公司 | Method and device for realizing decimal frequency deviation estimation |
| CN102075475A (en) * | 2009-11-19 | 2011-05-25 | 卓胜微电子（上海）有限公司 | Combined tracking method for timing deviation and sampling frequency offset |
| CN102104570A (en) * | 2009-12-18 | 2011-06-22 | 上海华虹集成电路有限责任公司 | Integer frequency offset estimation device and method in CMMB (China Mobile Multimedia Broadcasting) system |
| CN102480452A (en) * | 2010-11-26 | 2012-05-30 | 中国科学院微电子研究所 | Carrier frequency synchronous circuit and method of OFDM (Orthogonal Frequency Division Multiplexing) system |
-
2013
- 2013-12-24 CN CN201310723480.XA patent/CN104735011B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007148267A1 (en) * | 2006-06-20 | 2007-12-27 | Nxp B.V. | Method and apparatus for estimating carrier frequency offset |
| CN101014031A (en) * | 2007-02-13 | 2007-08-08 | 鼎芯通讯（上海）有限公司 | Frequency coarse synchronizing method |
| KR100882880B1 (en) * | 2007-08-23 | 2009-02-09 | 전자부품연구원 | Channel estimation system on the basis of be simplified dft for ofdm system and the method thereof |
| CN101567868A (en) * | 2008-04-25 | 2009-10-28 | 中兴通讯股份有限公司 | Decimal frequency deviation estimation method of CMMB cellphone television |
| CN101902426A (en) * | 2009-05-27 | 2010-12-01 | 中兴通讯股份有限公司 | Method and device for realizing decimal frequency deviation estimation |
| CN102075475A (en) * | 2009-11-19 | 2011-05-25 | 卓胜微电子（上海）有限公司 | Combined tracking method for timing deviation and sampling frequency offset |
| CN102104570A (en) * | 2009-12-18 | 2011-06-22 | 上海华虹集成电路有限责任公司 | Integer frequency offset estimation device and method in CMMB (China Mobile Multimedia Broadcasting) system |
| CN101764780A (en) * | 2009-12-28 | 2010-06-30 | 北京中星微电子有限公司 | Method and system for time and frequency synchronization in orthogonal frequency division multiplexing |
| CN102480452A (en) * | 2010-11-26 | 2012-05-30 | 中国科学院微电子研究所 | Carrier frequency synchronous circuit and method of OFDM (Orthogonal Frequency Division Multiplexing) system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104735011B (en) | 2019-01-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1738302B (en) | Frequency recovery apparatus and mobile broadcast receiver using the frequency recovery apparatus | |
| WO2020164617A1 (en) | Signal sending method, signal receiving method, network device and terminal | |
| US9363004B2 (en) | Apparatus and associated methods for switching between antennas in a multi-antenna receiver | |
| CN101636997B (en) | Method and apparatus for digital signal reception | |
| CN105007150A (en) | Low-signal-noise-ratio SC-FDE (Single Carrier-Frequency Domain Equalization) system synchronization method and synchronization device | |
| CN101056300B (en) | Relevancy interval synchronization device and method | |
| CN102573044B (en) | Method and device for locating interference source cell | |
| CN105141562A (en) | Communication system and synchronization method thereof | |
| CN113872909B (en) | Short-time burst carrier capturing method and system for low-orbit satellite Internet of things | |
| CN101753499A (en) | Method for jointly estimating the integral multiple carrier frequency shift and accurate symbol timing | |
| CN103873411A (en) | Method and device for maximum likelihood frequency offset estimation based on joint pilot frequency | |
| CN101103556A (en) | Method and system for synchronization between a transmitter and a receiver in a wireless communication system | |
| CN103748846A (en) | Method and module for estimating frequency bias in a digital-telecommunications system | |
| CN103188067B (en) | A kind of chip clock frequency departure estimation error of spread spectrum system and the method for correction | |
| CN101789807B (en) | Frequency deviation evaluation method, device and communication device | |
| CN105162746B (en) | Time delay and frequency deviation estimating method and system based on CMMB | |
| CN102014097A (en) | Receiving terminal as well as fast frequency offset estimation device and method | |
| CN102655491A (en) | Frequency shift estimation method and system for coherent demodulation frequency shift keying modulating signals | |
| CN1993954B (en) | FFT carrier frequency offset estimation of OFDM signal | |
| CN106160969A (en) | A kind of LTE down-going synchronous data launch configuration and method of reseptance | |
| CN102611665B (en) | Integer frequency bias in CMMB system and thin regularly combined estimation method and device | |
| CN101557374A (en) | Large frequency deviation detecting method of DTMB receiving system | |
| CN104735011A (en) | Device and method for sample frequency deviation robust estimation in complex channel environment | |
| CN101667990B (en) | OFDM frequency offset joint estimation method | |
| CN104735012A (en) | Detection device for head diameter position of receiving end of digital wireless communication system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20151111 Address after: 214072 Jiangsu province Wuxi Liyuan Development Zone Hubin District 530 Building 1 room 1203 No. twelve Applicant after: JIANGSU MAXSCEND TECHNOLOGY CO., LTD. Address before: 201203, room 50, 202 Xia Xia Road, Shanghai, Pudong New Area Applicant before: Maxscend Technologies Inc. |
|
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 214072 Jiangsu province Wuxi Liyuan Development Zone Hubin District 530 Building 1 room 1203 No. twelve Applicant after: Jiangsu Zhuo Sheng microelectronics Limited by Share Ltd Address before: 214072 Jiangsu province Wuxi Liyuan Development Zone Hubin District 530 Building 1 room 1203 No. twelve Applicant before: JIANGSU MAXSCEND TECHNOLOGY CO., LTD. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |