CN102281219B - Method and apparatus for adjusting dynamic scope of signal - Google Patents
Method and apparatus for adjusting dynamic scope of signal Download PDFInfo
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- CN102281219B CN102281219B CN201010199431.7A CN201010199431A CN102281219B CN 102281219 B CN102281219 B CN 102281219B CN 201010199431 A CN201010199431 A CN 201010199431A CN 102281219 B CN102281219 B CN 102281219B
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/022—Channel estimation of frequency response
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2657—Carrier synchronisation
- H04L27/2659—Coarse or integer frequency offset determination and synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2669—Details of algorithms characterised by the domain of operation
- H04L27/2672—Frequency domain
Abstract
The present invention discloses a method and apparatus for adjusting the dynamic scope of a signal. The method comprises respectively calculating the module values of channel estimation values of data subcarriers in the signal; calculating the mean value of the module values; determining displacements according to the module values and the mean value; and displacing the subcarriers by using the displacements, thus adjusting the dynamic scope of the signal. According to the invention, the data precision and the system decoding performance are improved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of method and the device that adjust dynamic range of signals.
Background technology
Existing based on Institute of Electrical and Electric Engineers (Institute for Electrical andElectronic Engineers, referred to as IEEE) micro-wave access to global intercommunication (the Worldwide Interoperability for Microwave Access of 802.16e standard, referred to as WiMAX) wireless communication system is OFDM (Orthogonal FrequencyDivision Multiplexing, referred to as OFDM) system, the dynamic range of each sub-carrier power value of transmitting terminal is normally little, but in transmitting procedure, because the channel of each subcarrier place frequency there are differences, each sub-carrier power value of signal received be there are differences, in correlation technique, the difference of the performance number existence reducing each subcarrier is operated by channel estimation and equalization.In theory, WiMAX system carries out channel estimation and equalization operation to frequency domain data, adopts frequency domain data to be multiplied by the conjugation of channel estimation value, divided by the mould square of channel estimation value, i.e. AxH
*/ (| H|^2), wherein, A is the frequency domain data of the subcarrier received, H is channel estimation value, but when actual hardware circuit realiration, does not carry out divide operations, but corresponding step after channel estimation balancing is as right in demodulation operation step | H|^2 compensates accordingly, but the channel estimation and equalization of aforesaid way, can not reach the effect reducing dynamic range of signals.
Fig. 1 is the flow chart carrying out frequency domain equalization according to correlation technique, as shown in Figure 1, comprises the steps:
Data on step S102, RRU radio frequency unit reception antenna;
Step S104, the data received by RRU carry out fast Fourier transform to frequency domain;
Step S106, carries out the operation toward high displacement by above-mentioned frequency domain data;
Step S108, the frequency offset calculation when data after displacement are carried out;
Step S110, carries out channel estimating and equilibrium, adopts frequency domain data to be multiplied by the conjugation of channel estimation value, i.e. AxH
*, wherein, A is the frequency domain data of the subcarrier received.H frequency domain data that is excessive or too small its subcarrier of expression is excessive or too small, if H is large, illustrates that the performance number of the frequency domain data of the subcarrier of its correspondence is also large, so AxH
*power just larger; Otherwise, if H is little, illustrate that the performance number of the frequency domain data of the subcarrier of its correspondence is also little, so AxH
*power just less;
Data after channel estimating and equilibrium are carried out equal gain combining by step S112;
Step S114, carries out signal receiving, and compensate for channel estimates the divide operations of not carrying out, by signal divided by | H|^2.
Can be found out by above-mentioned flow process, in actual channel, due to channel difference, namely the fading channel of each subcarrier process is different, as step S110, channel estimation value H difference can be larger, and only right after channel estimating and equilibrium | and H|^2 compensates (compensating in step S114 after step silo), makes the AxH that each subcarrier is obtained in channel estimating and equilibrium
*value difference not larger, in systems in practice, subcarrier is kept in the bit of some, the subcarrier significant bit of smaller power is caused to be present in lower bit like this, and the significant bit of the subcarrier of relatively high power leaves in higher bit, namely, there is the excessive problem of dynamic range in the sub-carrier power of signal, like this, carry out channel estimating and equalization operation not only can not reduce dynamic range of signals, even can expand original dynamic range of signals, and now the precision comparison of data is low.
When carrying out channel estimating and equalization operation in correlation technique, larger owing to there is dynamic range of signals, cause the precision comparison of subcarrier data low, even cause whole system decoding performance poor.
Summary of the invention
Main purpose of the present invention is to provide a kind of method and the device that adjust dynamic range of signals, with at least solve above-mentioned carry out channel estimating and equalization operation time, larger owing to there is dynamic range of signals, cause the precision comparison of subcarrier data low, even cause the problem that whole system decoding performance is poor.
To achieve these goals, according to an aspect of invention, a kind of method adjusting dynamic range of signals is provided.
Method according to adjustment dynamic range of signals of the present invention comprises: the modulus value calculating the channel estimation value of data subcarrier in signal respectively; Calculate the mean value of modulus value; Use modulus value and mean value determination displacement number; Use displacement number sub-carrier data to carry out displacement, be used for adjusting dynamic range of signals.
Further, modulus value and mean value determination displacement number is used to comprise: the ratio calculating modulus value and mean value; If ratio is greater than the first threshold value or is less than the second threshold value, modulus value is carried out displacement, determine that the displacement when absolute value of the difference of the modulus value after displacement and mean value is minimum is displacement number.
Further, the first threshold value and the second threshold value is determined according to mean value and modulus value.
Further, use displacement number sub-carrier data to carry out displacement to comprise: use the half of displacement number to carry out first time displacement operation as displacement sub-carrier data; Carry out channel estimating and equalization operation; The half of displacement number is used to carry out second time displacement operation as displacement sub-carrier data.
Further, using after the half of displacement number carries out second time displacement operation as displacement sub-carrier data, also comprise: the subcarrier data after displacement is compensated.
Further, by the modulus value of the channel estimation value of the channel estimation value difference calculated data subcarrier of the pilot sub-carrier in signal.
To achieve these goals, according to a further aspect in the invention, a kind of device adjusting dynamic range of signals is provided.
Device according to adjustment dynamic range of signals of the present invention comprises: magnitude calculation module, for calculating the modulus value of the channel estimation value of data subcarrier in signal respectively; Mean value calculation module, for calculating the mean value of modulus value; Determination module, for using modulus value and mean value determination displacement number; Displacement module, for using displacement number sub-carrier data to carry out displacement, is used for adjusting dynamic range of signals.
Further, determination module comprises: ratio computation module, for calculating the ratio of modulus value and mean value; Displacement determination module, if be greater than the first threshold value for ratio or be less than the second threshold value, carries out displacement by modulus value, determines that the displacement when absolute value of the difference of the modulus value after displacement and mean value is minimum is displacement number.
Further, displacement module comprises: the first displacement module, carries out displacement operation for using the half of displacement number as displacement; Channel estimating and balance module, for carrying out channel estimating and equalization operation; Second displacement module, carries out displacement operation for using the half of displacement number as displacement sub-carrier data.
Further, said apparatus also comprises: compensating module, for using after the half of displacement number carries out second time displacement operation as displacement sub-carrier data, compensates the subcarrier data after displacement.
By the present invention, adopt the modulus value of the channel estimation value calculating data subcarrier in signal respectively; Calculate the mean value of modulus value; Use modulus value and mean value determination displacement number; Displacement number sub-carrier data are used to carry out displacement, be used for adjusting dynamic range of signals, solve when carrying out channel estimating and equalization operation, larger owing to there is dynamic range of signals, cause the precision comparison of subcarrier data low, even cause the problem that whole system decoding performance is poor, and then reach the effect improving data precision and system decoding performance.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart carrying out frequency domain equalization according to correlation technique;
Fig. 2 is the flow chart of the method for adjustment dynamic range of signals according to the embodiment of the present invention;
Fig. 3 is the flow chart carrying out frequency domain equalization according to the preferred embodiment of the invention;
Fig. 4 is the preferred flow charts of the method for adjustment dynamic range of signals according to the embodiment of the present invention;
Fig. 5 is the structured flowchart of the device of adjustment dynamic range of signals according to the embodiment of the present invention; And
Fig. 6 is the preferred structured flowchart of the device of adjustment dynamic range of signals according to the embodiment of the present invention.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
According to embodiments of the invention, provide a kind of method adjusting dynamic range of signals, Fig. 2 is the flow chart of the method for adjustment dynamic range of signals according to the embodiment of the present invention, as shown in Figure 2, comprising:
Step S202, calculates the modulus value of the channel estimation value of data subcarrier in signal respectively;
Step S204, calculates the mean value of modulus value;
Step S206, uses modulus value and mean value determination displacement number;
Step S208, uses displacement number sub-carrier data to carry out displacement, is used for adjusting dynamic range of signals.
In correlation technique, when carrying out channel estimating and equalization operation, larger owing to there is dynamic range of signals, cause the precision comparison of subcarrier data low, even cause whole system decoding performance poor.In the embodiment of the present invention, adopt the modulus value of the channel estimation value calculating data subcarrier in signal respectively; Calculate the mean value of modulus value; Use modulus value and mean value determination displacement number; Displacement number sub-carrier data are used to carry out displacement, be used for adjusting dynamic range of signals, solve when carrying out channel estimating and equalization operation, larger owing to there is dynamic range of signals, cause the precision comparison of subcarrier data low, even cause the problem that whole system decoding performance is poor, and then reach the effect improving data precision and system decoding performance.
Preferably, step S206 comprises: the ratio calculating modulus value and mean value; If ratio is greater than the first threshold value or is less than the second threshold value, modulus value is carried out displacement, determine that the displacement when absolute value of the difference of the modulus value after displacement and mean value is minimum is displacement number.
Preferably, the first threshold value and the second threshold value is determined according to mean value and modulus value.
Preferably, step S208 comprises: use the half of displacement number to carry out first time displacement operation as displacement sub-carrier data; Carry out channel estimating and equalization operation; The half of displacement number is used to carry out second time displacement operation as displacement sub-carrier data.By the preferred embodiment, before channel estimating and equalization operation, carry out displacement with displacement half, first reduction dynamic range, after channel estimating and equalization operation, carry out displacement with residual displacement amount, the operation of this two step makes the dynamic range of channel obtain effective reduction.
Preferably, using after the half of displacement number carries out second time displacement operation as displacement sub-carrier data, said method also comprises: compensate the subcarrier data after displacement.By the preferred embodiment, the subcarrier data after displacement is compensated, make the data after being shifted keep original order of magnitude, improve the precision of data processing.
Preferably, by the modulus value of the channel estimation value of the channel estimation value difference calculated data subcarrier of the pilot sub-carrier in signal.By the preferred embodiment, use the pilot sub-carrier estimated value in signal to carry out the modulus value of the channel estimation value of calculated data subcarrier, reduce operand.
First embodiment
Fig. 3 is the flow chart carrying out frequency domain equalization according to the preferred embodiment of the invention, as shown in Figure 3, comprising:
Step S302, the data on long-distance radio frequency unit (Radio Remote Unit, referred to as RRU) radio frequency unit reception antenna;
Step S304, the data received by RRU carry out fast Fourier transform to frequency domain;
Step S306, carries out first time displacement for reducing dynamic range;
Data after above-mentioned displacement are carried out the operation toward high displacement by step S308;
Step S310, the frequency offset calculation when data after displacement are carried out;
Step S312, carries out channel estimating and equilibrium, adopts frequency domain data to be multiplied by the conjugation of channel estimation value, i.e. AxH
*, wherein, A is the frequency domain data of the subcarrier received;
Step S314, carries out second time displacement for reducing dynamic range;
Data after displacement are carried out equal gain combining by step S316;
Step S318, carries out signal receiving, and simultaneously compensate for channel estimates the divide operations of not carrying out and displacement operation, actual compensation be | H|^2 and AxH
*the number of integral shift.
The present embodiment carried out first time displacement and after channel estimating and equilibrium, carries out second time displacement before channel estimating and equilibrium, and right after second time displacement | H|^2 and AxH
*the number of integral shift compensates, and reduces the dynamic range of signal, improves data precision.
Second embodiment
Present invention also offers a preferred embodiment, combine the technical scheme of above-mentioned multiple preferred embodiment, Fig. 4 is the preferred flow charts of the method for adjustment dynamic range of signals according to the embodiment of the present invention, describes in detail below in conjunction with Fig. 4.
Step S402, obtains the channel estimation value of data subcarrier according to pilot sub-carrier;
Step S404, asks the mould of the value after each data subcarrier equilibrium, namely | and AxH
*|;
Step S406, asks all data subcarrier equilibriums to be worth the mean value of mould afterwards;
Step S408, for each data subcarrier, calculates its AxH
*modulus value and the ratio of mean value, if be greater than predetermined value a or be less than predetermined value b, by its AxH
*modulus value carry out being displaced to its value closest to mean value, record carry digit scale, wherein, according to mean value and magnitude calculation a and b simultaneously.
Step S410, for all data subcarriers, carry out first time displacement according to its scale value to it, carry digit is scale/2;
It should be noted that, step S402 to step S410 is the detailed step that in Fig. 3, step S306 carries out first time displacement in order to reduce dynamic range.
Step S412, for the data subcarrier after channel estimating and equilibrium, carries out second time displacement according to its scale value to it.
It should be noted that, if scale is even number, twice, front and back displacement number is scale/2, if scale is odd number, then first time displacement number is scale/2, and second time displacement number is (scale+1)/2.The step S314 that step S412 corresponds in Fig. 3 carries out second time displacement to reduce dynamic range.
Step S414, when compensate for channel is estimated with the division do not done time balanced, reality compensation be (| H|^2) * scale.
It should be noted that, the step S318 that step S414 corresponds in Fig. 3 carries out signal receiving, and compensate for channel estimates the divide operations of not carrying out and displacement operation simultaneously, actual compensation be | H|^2 and AxH
*the number of integral shift.
By the embodiment of the present invention, carry out with scale/2 being that displacement carries out first time displacement and carry out second time displacement with (scale+1)/2 after channel estimating and equilibrium before channel estimating and equilibrium, and right | H|^2 and AxH
*the number of integral shift compensates, and reduces the dynamic range of signal, improves data precision.
It should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing, and, although show logical order in flow charts, but in some cases, can be different from the step shown or described by order execution herein.
According to embodiments of the invention, provide a kind of device adjusting dynamics of channels scope, Fig. 5 is the structured flowchart of the device of adjustment dynamic range of signals according to the embodiment of the present invention, as shown in Figure 5, this device comprises: magnitude calculation module 52, mean value calculation module 54, determination module 56 and displacement module 58, be described in detail said structure below:
Magnitude calculation module 52, for calculating the modulus value of the channel estimation value of data subcarrier in signal respectively; Mean value calculation module 54, is connected to magnitude calculation module 52, for calculating the mean value of the modulus value that magnitude calculation module 52 calculates; Determination module 56, is connected to magnitude calculation module 52 and mean value calculation module 54, and the mean value that the modulus value calculated for using magnitude calculation module 52 and mean value calculation module 54 calculate is to determine displacement number; Displacement module 58, is connected to determination module 56, and the displacement number sub-carrier data determined for using determination module 56 carry out displacement, is used for adjusting dynamic range of signals.
In correlation technique, when carrying out channel estimating and equalization operation, larger owing to there is dynamic range of signals, cause the precision comparison of subcarrier data low, even cause whole system decoding performance poor.In the embodiment of the present invention, adopt the modulus value of the channel estimation value calculating data subcarrier in signal respectively and calculate the mean value of modulus value; Modulus value and mean value determination displacement number is used to carry out displacement, be used for adjusting dynamic range of signals, solve when carrying out channel estimating and equalization operation, larger owing to there is dynamic range of signals, cause the precision comparison of subcarrier data low, even cause the problem that whole system decoding performance is poor, and then reach the effect improving data precision and system decoding performance.
Fig. 6 is the preferred structured flowchart of the device of adjustment dynamic range of signals according to the embodiment of the present invention, as shown in Figure 6, determination module 56 comprises: ratio computation module 562 and displacement determination module 564, displacement module 58 comprises: the first displacement module 582, channel estimating and balance module 584 and the second displacement module 586, said apparatus also comprises compensating module 62, is described in detail below to said structure:
Determination module 56 comprises: ratio computation module 562, is connected to magnitude calculation module 52 and mean value calculation module 54, for calculating the ratio of modulus value that magnitude calculation module 52 calculates and the mean value that mean value calculation module 54 calculates; Displacement determination module 564, be connected to ratio computation module 562, if the ratio calculated for computing module 562 is greater than the first threshold value or is less than the second threshold value, modulus value is carried out displacement, determine that the displacement when absolute value of the difference of the modulus value after displacement and mean value is minimum is displacement number.
Displacement module 58 comprises: the first displacement module 582, is connected to displacement determination module 564, and the half of the displacement number determined for using displacement determination module 564 carries out second time displacement operation as displacement sub-carrier data; Channel estimating and balance module 584, be connected to the first displacement module 582, for carrying out channel estimating and equalization operation to the data after the first displacement module 582 displacement; Second displacement module 586, is connected to displacement determination module 564, and the half of the displacement number determined for using displacement determination module 564 carries out second time displacement operation as displacement sub-carrier data.
Said apparatus also comprises: compensating module 62, is connected to the second displacement module 586, compensates for the subcarrier data after carrying out displacement operation using the half of displacement number as displacement sub-carrier data to the second displacement module 586.
By the preferred embodiment, before channel estimating and equalization operation, carry out displacement with displacement half, first reduction dynamic range, after channel estimating and equalization operation, carry out displacement with residual displacement amount, the operation of this two step makes the dynamic range of channel obtain effective reduction.
It should be noted that, the device of the adjustment dynamic range of signals described in device embodiment corresponds to above-mentioned embodiment of the method, and its concrete implementation procedure carried out detailed description in embodiment of the method, did not repeat them here.
In sum, by the present invention, solve when carrying out channel estimating and equalization operation, larger owing to there is dynamic range of signals, cause the precision comparison of subcarrier data low, even cause the problem that whole system decoding performance is poor, and improve the performance of data precision and system decoding.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. adjust a method for dynamic range of signals, it is characterized in that, comprising:
Calculate the modulus value of the channel estimation value of data subcarrier in signal respectively;
Calculate the mean value of described modulus value;
Use described modulus value and described mean value determination displacement number;
Use institute's shift number to carry out displacement to described subcarrier data, be used for adjusting described dynamic range of signals;
Wherein, use institute's shift number to carry out displacement to described subcarrier data to comprise:
The half of institute's shift number is used to carry out first time described displacement operation as displacement to described subcarrier data;
Carry out channel estimating and equalization operation;
The half of institute's shift number is used to carry out the described displacement operation of second time as displacement to described subcarrier data.
2. method according to claim 1, is characterized in that, uses described modulus value and described mean value determination displacement number to comprise:
Calculate the ratio of described modulus value and described mean value;
If described ratio is greater than the first threshold value or is less than the second threshold value, described modulus value is carried out displacement, determine that the displacement when absolute value of the difference of the described modulus value after described displacement and described mean value is minimum is institute's shift number.
3. method according to claim 2, is characterized in that, determines described first threshold value and described second threshold value according to described mean value and described modulus value.
4. method according to claim 1, is characterized in that, using after the half of institute shift number carries out the described displacement operation of second time as displacement to described subcarrier data, also comprises: compensate the described subcarrier data after described displacement.
5. method according to claim 1, is characterized in that, is calculated the modulus value of the channel estimation value of described data subcarrier by the channel estimation value of the pilot sub-carrier in described signal respectively.
6. adjust a device for dynamic range of signals, it is characterized in that, comprising:
Magnitude calculation module, for calculating the modulus value of the channel estimation value of data subcarrier in signal respectively;
Mean value calculation module, for calculating the mean value of described modulus value;
Determination module, for using described modulus value and described mean value determination displacement number;
Displacement module, for using, shift number carries out displacement to described subcarrier data, is used for adjusting described dynamic range of signals;
Wherein, described displacement module comprises:
First displacement module, for using, the half of shift number carries out described displacement operation as displacement;
Channel estimating and balance module, for carrying out channel estimating and equalization operation;
Second displacement module, for using, the half of shift number carries out described displacement operation as displacement to described subcarrier data.
7. device according to claim 6, is characterized in that, described determination module comprises:
Ratio computation module, for calculating the ratio of described modulus value and described mean value;
Displacement determination module, if be greater than the first threshold value for described ratio or be less than the second threshold value, carries out displacement by described modulus value, determines that the displacement when absolute value of the difference of the described modulus value after described displacement and described mean value is minimum is institute's shift number.
8. device according to claim 6, it is characterized in that, also comprising: compensating module, for using after the half of institute shift number carries out the described displacement operation of second time as displacement to described subcarrier data, the described subcarrier data after described displacement being compensated.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010199431.7A CN102281219B (en) | 2010-06-09 | 2010-06-09 | Method and apparatus for adjusting dynamic scope of signal |
| PCT/CN2010/077547 WO2011153760A1 (en) | 2010-06-09 | 2010-09-30 | Method and device for adjusting dynamic range of signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010199431.7A CN102281219B (en) | 2010-06-09 | 2010-06-09 | Method and apparatus for adjusting dynamic scope of signal |
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| CN102281219B true CN102281219B (en) | 2015-07-22 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6021110A (en) * | 1996-08-12 | 2000-02-01 | Telecommunications Research Laboratories | OFDM timing and frequency recovery system |
| CN1705301A (en) * | 2004-06-01 | 2005-12-07 | 北京大学 | Channel equalization method of OFDM system |
| CN1809040A (en) * | 2006-01-26 | 2006-07-26 | 东南大学 | Programmable device based estimation and balancing apparatus and method for OFDM channels |
| WO2009038543A1 (en) * | 2007-09-19 | 2009-03-26 | Agency For Science, Technology And Research | A method of transmitting data to a receiver |
| CN101536333A (en) * | 2006-09-29 | 2009-09-16 | 联发科技股份有限公司 | Pre-scaling of initial channel estimates in joint detection |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SG104340A1 (en) * | 2002-07-03 | 2004-06-21 | Oki Techno Ct Singapore Pte | Receiver and method for wlan burst type signals |
| CN1333532C (en) * | 2004-04-02 | 2007-08-22 | 清华大学 | Quadrature frequency division complex digita receiver |
| CN101039291A (en) * | 2006-03-16 | 2007-09-19 | 中国科学院上海微系统与信息技术研究所 | Method and apparatus for correcting residual carrier frequency deviation, fixed phase and amplitude deviation |
| CN101132388B (en) * | 2007-09-18 | 2013-01-09 | 沖电气（新加坡）技术中心 | Receiving method and device for receiving coded signal assisted by signal channel condition information |
-
2010
- 2010-06-09 CN CN201010199431.7A patent/CN102281219B/en not_active Expired - Fee Related
- 2010-09-30 WO PCT/CN2010/077547 patent/WO2011153760A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6021110A (en) * | 1996-08-12 | 2000-02-01 | Telecommunications Research Laboratories | OFDM timing and frequency recovery system |
| CN1705301A (en) * | 2004-06-01 | 2005-12-07 | 北京大学 | Channel equalization method of OFDM system |
| CN1809040A (en) * | 2006-01-26 | 2006-07-26 | 东南大学 | Programmable device based estimation and balancing apparatus and method for OFDM channels |
| CN101536333A (en) * | 2006-09-29 | 2009-09-16 | 联发科技股份有限公司 | Pre-scaling of initial channel estimates in joint detection |
| WO2009038543A1 (en) * | 2007-09-19 | 2009-03-26 | Agency For Science, Technology And Research | A method of transmitting data to a receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102281219A (en) | 2011-12-14 |
| WO2011153760A1 (en) | 2011-12-15 |
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