CN1905539A - Channel estimating and balancing apparatus for time domain known array OFDM system and method thereof - Google Patents
Channel estimating and balancing apparatus for time domain known array OFDM system and method thereof Download PDFInfo
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Abstract
The invention is a time-domain known sequence inserted OFDM-based channel estimating and balancing device, applied to handheld mobile digital multimedia terminals, comprising: data separator, separating the received signal into time-domain known sequence and DFT data frame; time-domain known sequence interference eliminating unit, making reconstruction and circular convolution on the received data according to the obtained channel impulse response; time-domain channel estimating unit, obtaining the channel impulse response and sending it to frequency- domain balancing unit; local time-domain known generator unit, generating local time-domain known sequence; FFT unit; frequency-domain balancing unit, implementing frequency-domain balance. And the device can implement channel estimation and reception of a system with high spectrum utilization ratio and has not high complexity, and can meet the requirements of handheld mobile equipment.
Description
Technical field
The present invention relates to a kind of channel estimating and balancer, particularly a kind of channel estimating of OFDM modulation receiver of time domain known array and balancer and system thereof.
Background technology
The appearance of digital information transmission technical makes voice, image, literal to transmit with unified format, thereby has also caused the trend that various media terminations combine.In this year, along with the develop rapidly of digital television techniques and mobile communication technology, simultaneously, along with improving constantly of living standard, people begin to wish can be at any time, watch up-to-date TV programme by traditional mobile phone terminal everywhere.The development of this technology and demand has caused a kind of generation of the new hand mobile digital multimedia information transmission technology, just usually said " mobile TV ".
The mode of the message transmission that is adopted in the mobile TV can be continued to use the transmission technology of Digital Television Terrestrial Broadcasting substantially.But the characteristics of handheld device itself have proposed new requirement to system again.
In the process of terrestrial wireless broadcast transmission, because the decline and the multipath of channel have caused its frequency selective characteristic.If transmitter or receiver move simultaneously, can cause the selection of time characteristic of channel this moment.
In order to guarantee under mobile and city environment, also to obtain preferable performance, must carry out channel estimating and balancer accurately.In traditional multicarrier system, generally adopt frequency domain to estimate and balanced mode, handle.
The single-carrier system that some are traditional, ATSC system as the U.S., that adopt is as shown in Figure 7 DFF (Decision Feedback Equalizer, DFE) process of time domain equalization, it can use field synchronization to train, but two field sync data segment be spaced apart 24ms, so, just need carry out adaptive blind equalization for changing than channel faster.The major defect of this method is: in order to reach desirable effect, equalizer often needs a large amount of taps, the hardware complexity and the cost of system have been increased, and, because DFE is the IIR structure, exists problem of unstable, its operate as normal also needs certain signal to noise ratio simultaneously, channel variation can not be too fast, and this has just limited its tracking velocity.
DVB-H (and the DVB-T that the is used for ground digital television broadcast) system in Europe has used the method for pilot tone frequency domain equalization.As shown in Figure 8, the ofdm signal of frequency domain is imported into separator 51, and after Signal Separation, reception data on the pilot frequency locations and the local original pilots sequence that produces enter divider 52, obtain channel estimation values of pilot frequency positions
Y wherein
p(n, k), X
p(n k) represents the transmission of pilot frequency locations and receive frequency-region signal respectively.
Enter interpolater 54 then, right
Carry out the time and frequency zone two-dimensional interpolation and just can obtain the value of whole channel estimating
Then channel estimation value and original reception data are sent in the equalizer 55, just can be carried out the estimated value that equilibrium obtains original transmission data receiving data.
For ATSC, owing to used adaptive DFF, it is continuous requiring handled data flow, and for the hand mobile digital multimedia terminal, that data happen suddenly often or discontinuous, so the balancer of ATSC is not suitable for handheld device.
And the used frequency domain of DVB-H is as shown in Figure 8 estimated, can obtain the good channel estimated result in static and middle low speed environments, but owing to inserted a large amount of pilot tones in the frequency domain data, reduce the availability of frequency spectrum like this.
In sum, the channel estimation methods of more existing systems all adopts pilot tone to carry out channel estimating, reduces system spectral efficiency on the one hand greatly, the damage effective data rate; On the other hand, the interpolation of front and back frame is calculated, and can not well satisfy the requirement of following hand mobile digital multimedia message transmission.
Summary of the invention
The purpose of this invention is to provide a kind of channel estimating and balancer, it is based on the OFDM that inserts time domain known array, the Frame that being applicable to makes a start sends comprises a communication system of carrying the known random sequence of time domain as frame head and frequency domain data, be particularly useful for portable terminal, particularly hand-held digital multimedia terminal.
Insert the OFDM of time domain known array, use the time domain known array of frame head to estimate, thereby need in frequency domain data, not insert pilot tone, thereby improved the availability of frequency spectrum greatly.Simultaneously, owing to still can adopt each OFDM symbol equilibrium piece processing mode once, so do not exist ATSC to be not suitable for the problem of burst transfer.
In order to realize above-mentioned purpose of the present invention, a first aspect of the present invention proposes channel estimating and the balancer of a kind of OFDM of time domain known array, comprise: data extractor, its input receives ofdm signal, and output time domain known signal data frame is to input to the time domain channel estimation module respectively and to go time domain known disturbances module to link to each other; Remove the time-domain known sequence interference unit, input receives the data frame from described data extractor, and another input links to each other with time-domain channel estimating unit, and its output is connected to the FFT unit; Time-domain channel estimating unit, an input links to each other with the known generator of local time domain, and what another input was imported is time domain known array corresponding in the isolated reception data of described data extractor, calculates through contrast, will obtain the impulse response h of channel
n, n=1 wherein, 2,3 ... K, and export to the FFT unit and remove the time-domain known sequence interference unit; Local time domain known array generator unit, it produces in this locality and the time domain known array of making a start and being consistent, and its output is connected to described time-domain channel estimating unit; The FFT unit, the channel impulse response that frequency domain data and the described time-domain channel estimating unit from the output of described removal time-domain known sequence interference unit that receives estimated carries out the FFT conversion, and the frequency domain data of corresponding output and channel frequency domain response enter the frequency domain equalization module and carry out frequency domain equalization; Frequency-domain balancing unit, an input receives the frequency domain data that described FFT unit is sent, and another input receives the channel frequency domain response that described FFT unit is sent, and finishes frequency domain equalization, the frequency domain data that output recovers.
Channel estimating and balancer according to second aspect present invention, it is characterized in that, described time-domain channel estimating unit adopts a FIR filter construction through transforming, comprise: the unit time delay registers group of forming by K unit time delay register, deposit the signal that the known generator of local time domain produces, and carry out the unit delay operation; The first multiplier group of being made up of K multiplier, each multiplier in this multiplier group median of the data in the corresponding unit time delay register and the tap renewal of existing filter with it multiply each other; By the accumulator group that K accumulator formed, be used to upgrade the tap coefficient of filter, and delivery channel pulse shock response h
n, n=1 wherein, 2,3 ... K; The second multiplier group of forming by K multiplier, each multiplier in this multiplier group data in the corresponding unit time delay register with it multiplies each other with the tap coefficient of the renewal postfilter of corresponding accumulator output with it, sends into the error signal maker; The error signal maker, the output signal value of the second multiplier group added and and current actual reception to the time domain known signal compare and subtract each other, produce error signal; The 3rd multiplier receives the error signal of described error signal maker output and the adjustment step-length of outside input, and the median that tap is upgraded is adjusted in output, sends in each multiplier in the second multiplier group.
Channel estimating and balancer according to third aspect present invention, it is characterized in that, the signal that produces at described local time domain known array generator unit is under the situation of bpsk signal, replaces described first multiplier group and the described second multiplier group with the first sign reversing module group and the second sign reversing module group.
Channel estimating and balancer according to fourth aspect present invention is characterized in that, the K value in the described time-domain channel estimating unit can be selected the normalization amount of delay after the multipath sampling of the maximum delay that equals to occur in the channel.
Channel estimating and balancer according to fifth aspect present invention is characterized in that the input of described time-domain channel estimating unit is a time domain known array, and the input and output of described frequency-domain balancing unit are frequency domain datas.
Channel estimating and balancer according to sixth aspect present invention is characterized in that, the time domain known array that described time-domain channel estimating unit is imported can be the PN sequence, and perhaps any one has the known array of pseudorandom feature.
According to a seventh aspect of the invention, provide channel estimating and the equalization methods of a kind of OFDM of time domain known array, having comprised: the ofdm signal to input carries out synchronously; Synchronous ofdm signal is separated into time domain known array and data frame two parts; Carry out channel estimating to separating the time domain known array that obtains; The channel impulse response and the Frame that estimate are eliminated the known array interference; Time domain data and the channel pulse impulse response processing that estimates are changed to frequency domain response; Carry out frequency domain equalization.
Channel estimating and equalization methods according to eighth aspect present invention is characterized in that described method is handled data in time domain, and the output after the described equalization step is frequency domain data.
Channel estimating and equalization methods according to ninth aspect present invention is characterized in that, described time domain known array can be the PN sequence, and perhaps any one has the known array of pseudorandom feature.
Described device is applicable to that the Frame of sending of making a start comprises a communication system of carrying the known random sequence of time domain as frame head and frequency domain data.
This device can be realized a kind of channel estimating and reception of system of high spectrum utilization, and complexity is not high, can satisfy the requirement of handheld mobile device.
Description of drawings
The time domain training channel estimating frequency domain equalization schematic representation of apparatus that Fig. 1 proposes for the present invention.
Fig. 2 is the structural representation of time-domain channel estimating unit in apparatus of the present invention.
Fig. 3 is the structural representation of the another kind of implementation of time-domain channel estimating unit in apparatus of the present invention.
Fig. 4 is the frame structure schematic diagram that is used for the hand mobile digital multimedia system that the present invention is correlated with.
Fig. 5 is the method schematic diagram of reconstruct datacycleization.
Fig. 6 shows the time domain training channel estimating of embodiments of the invention and the flow chart of equalization methods.
Fig. 7 is a DFF schematic diagram traditional among the ATSC.
Fig. 8 is channel estimating and the balancer schematic diagram that uses pilot tone among the DVB-T (DVB-H).
Embodiment
More detailed description the preferred embodiments of the present invention below with reference to accompanying drawings.
Fig. 1 is that the frequency domain equalization schematic representation of apparatus is estimated in the time domain training according to the preferred embodiment of the invention, as shown in Figure 1, channel estimating and balancer comprise according to the preferred embodiment of the invention: data extractor 10, the input data that it is handled are to have the OFDM symbol of frame structure as shown in Figure 4, this symbolic construction has comprised frame head part and DFT Frame body portion that time domain known array constitutes, data extractor 10 becomes time domain known array and DFT data frame with the Signal Separation that receives, its input links to each other with the A/D conversion module of receiver front end, an its output output time domain known signal also can be called the frame head part, another output is the output data frame body portion then, and these two ports link to each other with removal time domain known disturbances unit 12 with time-domain channel estimating unit 20 respectively; Remove time-domain known sequence interference unit 12, it has two input ports, an input port input receiving data frames body, another input port links to each other with the pulse impulse response of time-domain channel estimating unit 20 outputs, be reconstructed circular convolution according to the channel pulse impulse response that obtains to receiving data, to eliminate the interference of channel, the data that recover are admitted to FFT unit 14; Time-domain channel estimating unit 20, its effect is the impulse response that obtains channel, export to FFT unit 14 and remove time-domain known sequence interference unit 12, it has two inputs, one of them input links to each other with the known generator 22 of local time domain, what another input was imported is time domain known array corresponding in the data extractor 10 isolated reception data, calculates through contrast, will obtain the impulse response h of channel
n: (n:1---K), and export to FFT unit 14 and remove time-domain known sequence interference unit 12; Local time domain known array generator unit 22, it produces in this locality and the time domain known array of making a start and being consistent, and its output is connected to time-domain channel estimating unit 20; FFT unit 14 carries out the FFT conversion to frequency domain data that receives and the channel impulse response that estimates, and the frequency domain data of corresponding output and channel frequency domain response enter frequency-domain balancing unit 16 and carry out frequency domain equalization; Frequency-domain balancing unit 16, by a division arithmetic, be used to finish frequency domain equalization, it has two inputs, an input receives the frequency domain data that FFT unit 14 is sent, and the channel frequency domain response that input FFT unit 14 is sent is through a division arithmetic, finish frequency domain equalization, send the frequency domain data of recovery.
Time-domain channel estimating unit 20 is a structure as shown in Figure 2 normally.This device can be regarded a finite impulse response filter as, its complete structure comprises: the unit time delay registers group of being made up of a plurality of units time delay register 100, the accumulator group of forming by a plurality of accumulators 400, the first multiplier group and an adder of forming by a plurality of multiplier I.Wherein each Elementary Function is described below: unit time delay registers group 100 postpones input signal to be placed in each interior register of this group after the unit successively; By the first multiplier group 200 that a plurality of multiplier I form, this multiplier group 200 produces each tap updating value of next time according to the data in error signal and the current register; By the second multiplier group 300 that a plurality of multiplier II form, this multiplier group 300 is used for the tap coefficient of data in the register and filter is multiplied each other; Also have a multiplier 600 to be used for being multiplied by the step-length of an adjustment with error signal; Accumulator group 400 is used to upgrade the tap coefficient of filter; Error signal maker 500, be used for the signal value that all tap coefficients produce added and and the contrast of current received signal, produce error signal.
In the time-domain channel estimating unit 20 each module annexation be: unit time delay register: constituent parts time delay register connects successively in the unit time delay registers group 100, they be input as the local known random sequence of time domain that produces, each unit time delay register have two outputs respectively with multiplier group 200 in multiplier and a multiplier in the multiplier group 300 link to each other; Multiplier: wherein two inputs of each multiplier I link to each other with a corresponding separately unit time delay register and the error signal adjusted through step-length in the unit time delay registers group 100 respectively in the multiplier group 200, export the result and send into error signal maker 500; Two inputs of each multiplier II link to each other with output with its corresponding unit time delay register and accumulator respectively in another group multiplier 300, and it is exported the result and sends into adder; Also have 600, two inputs of a multiplier to be respectively error signal and adjustment step-length in addition, output is delivered to aforesaid first group of multiplier; Accumulator: its input of each accumulator in the accumulator group 400 links to each other with corresponding multiplier I in the multiplier group 200, and output links to each other with corresponding multiplier II in another multiplier group 300; Error signal maker 500: comprise a plurality of input ports and an input port that receives the received signal y (n) of current time of each multiplier II that is connected in the multiplier group 300, also comprise with a multiplier 600 linking to each other in order to the output port of output error signal e (n).
The signal that time-domain channel estimating unit 20 at first produces local time domain known array generator 22 is successively in the unit's of reading in time delay registers group 100; The time-domain signal that arrives of output signal that data in each register in the registers group 100 and tap coefficient are obtained behind the multiply accumulating mutually and current actual reception relatively obtains error signal e rror (n) then; Then, according to error signal renewal is regulated in the tap of training aids; At last. when error signal restrained, resulting tap coefficient was exactly the time domain impulse response h of channel
n: (n:1---K).
Number to various elementary cells used in the present invention can be done following basic regulations, if the actual channel impulse response duration is (J+1) * Ts, wherein Ts is the sampling time, employed unit time delay register number should be an integer greater than J in the so whole device, the multiplier number should be the integer greater than 2J+1, and the accumulator number should be the integer greater than J.
If the known random sequence of the time domain of sending making a start of communication system is a sequence that adopts the BPSK mapping, for example only comprise+1 and-1, then two groups of multipliers in installing can be replaced with simple data symbol conversion module.Its reason is, foregoing channel impulse response estimation device, it is the annexation of each unit in the time-domain channel estimating unit 20 of Fig. 2, two groups of multipliers 200,300 all have an input port to link to each other with unit time delay registers group 100, and the input of unit time delay register then is the local known random sequence of time domain that produces.That is to say, in the input random sequence be+1 and-1 situation under, multiplier I and II can be with simple sign reversing module replacements.
At this moment,, provided the time-domain channel estimating unit 20 ' of another execution mode, can comprise with reference to figure 3: unit time delay registers group 100 ', the signal that the known random sequence x ' of local time domain (n) is produced postpones to be placed in the register after the unit successively; First sign reversing module group of forming by a plurality of sign reversing module I 200 ' and the second sign reversing module group of forming by a plurality of sign reversing module iis 300 ', according to the data in the register with the symbol of filter tap coefficients is judged, also produce each tap updating value of next time; Accumulator group 400 ' is used to upgrade the tap coefficient of filter; Error signal maker 500 ', be used for the signal value that all tap coefficients produce added and and current received signal y ' (n) contrast generation error signal e ' (n).
The data of register are from local time domain known array generator in the time-domain channel estimating unit 20 and 20 ', time domain known array normally, and this sequence can be the PN sequence, perhaps any one has the known array of pseudorandom feature, handles as time-domain signal;
Get back to Fig. 1, remove time-domain known sequence interference unit 12 and be used for reconstructing circular convolution.Fig. 5 has provided the specific implementation method of reconstruct received signal circular convolution characteristic.At first; the PN protection that this locality is generated GI1 is at interval carried out linear convolution with the time domain channel response h that estimates, and obtains G (L is the maximum delay length of multipath among the figure), then with the signal that receives according to position shown in Figure 7; make the segmentation additive operation, obtain S1 and S2.At last, S2 is added and to S1, obtain S, thereby eliminate the time domain known array protection, and data segment is carried out reconstructing circular convolution at interval to the interference of data segment.
Fig. 6 shows the time domain training channel estimating of embodiments of the invention and the flow chart of equalization methods.With reference to structure shown in Figure 1 flow chart shown in Figure 6 is described.At first, the ofdm signal to input carries out synchronously in step S100.In step S200, synchronous ofdm signal is divided into time domain known array and data frame two parts through separator 10.At step S300, separate the time domain known array that obtains and carry out channel estimating through the FIR training aids.
The process of channel estimating comprises: defining one has the tap coefficient vector of the FIR filter of J+1 tap to be: C (0)=[c
0, c
1..., c
J]
T, initialization value be [1,0 ..., 0]
T
When receiving data and begin to be time domain known array, allow corresponding local PN data enter register on the delay line;
J+1 data are arranged in register, promptly X (n)=[pn (n), pn (n-1) ..., pn (n-J)]
TThe time, the beginning training process adopts the LMS algorithm.
Suppose that corresponding pn (n) actual reception data constantly are y (n).Training process is as follows:
C(n+1)＝C(n)+μ·e(n)·X
*(n)
Adjustment step size mu wherein is one and can presets or parameter that self adaptation is regulated that it is relevant with the speed and the precision of channel estimating, can get an integer, as 1, and perhaps 10.
When
The time, C (n) is the pulse impulse response h of channel.Promptly
This is also corresponding to the output of the time-domain channel estimating unit of Fig. 1.
Next, in step S400, make the channel impulse response and the Frame that estimate eliminate the work that known array disturbs through module 12, this step is corresponding with the corresponding explanation that provides of Fig. 6 " removing PN disturbs ".
Then, in step S500,14 processing change to frequency domain response through the FFT module with the channel pulse impulse response that estimates with time domain data.At last, in step S600, utilize module 16 to carry out frequency domain equalization.
According to above-mentioned flow process, also can realize device proposed by the invention with software mode.
Be appreciated that from the description of the invention described above embodiment, channel estimating that the present invention provides and receiving system can carry out channel estimating by the time domain known array in the frame head, improved the frequency domain utilization ratio, simultaneously, owing to adopted each OFDM symbol to carry out the piece processing mode of a frequency domain equalization, can be applicable to the burst requirement in the hand-held mobile multimedia Digital Transmission.
Although represented and described the present invention with reference to its specific embodiment, it will be understood by those of skill in the art that the modification that under the situation that does not break away from the spirit and scope that are defined by the following claims, can make various forms and details.
Claims (9)
1. the channel estimating of the OFDM of a time domain known array and balancer comprise:
Data extractor (10), its input receives ofdm signal, and output time domain known signal data frame is to input to time domain channel estimation module (20) respectively and to go time domain known disturbances module (12) to link to each other;
Remove time-domain known sequence interference unit (12), input receives the data frame from described data extractor, and another input links to each other with time-domain channel estimating unit (20), and its output is connected to FFT unit (14);
Time-domain channel estimating unit (20), an input links to each other with the known generator of local time domain (22), what another input was imported is time domain known array corresponding in the isolated reception data of described data extractor (10), calculates through contrast, will obtain the impulse response h of channel
n, n=1 wherein, 2,3......K, and export to FFT unit (14) and remove time-domain known sequence interference unit (12);
Local time domain known array generator unit (22), it produces in this locality and the time domain known array of making a start and being consistent, and its output is connected to described time-domain channel estimating unit (20);
FFT unit (14), the channel impulse response that frequency domain data and the described time-domain channel estimating unit (20) from described removal time-domain known sequence interference unit (12) output that receives estimated carries out the FFT conversion, and the frequency domain data of corresponding output and channel frequency domain response enter the frequency domain equalization module and carry out frequency domain equalization;
Frequency-domain balancing unit, an input receives the frequency domain data that described FFT unit (14) is sent, and another input receives the channel frequency domain response that described FFT unit (14) is sent, and finishes frequency domain equalization, the frequency domain data that output recovers.
2. channel estimating according to claim 1 and balancer is characterized in that, described time-domain channel estimating unit (20) adopts a FIR filter construction through transforming, and comprising:
By the unit time delay registers group (100) that K unit time delay register formed, deposit the signal that the known generator of local time domain produces, and carry out the unit delay operation;
The first multiplier group of being made up of K multiplier (200), each multiplier in this multiplier group median of the data in the corresponding unit time delay register and the tap renewal of existing filter with it multiply each other;
By the accumulator group (400) that K accumulator formed, be used to upgrade the tap coefficient of filter, and delivery channel pulse shock response h
n, n=1 wherein, 2,3......K;
The second multiplier group of forming by K multiplier (300), each multiplier in this multiplier group data in the corresponding unit time delay register with it multiplies each other with the tap coefficient of the renewal postfilter of corresponding accumulator output with it, sends into the error signal maker;
The error signal maker, the output signal value of the second multiplier group added and and current actual reception to the time domain known signal compare and subtract each other, produce error signal;
The 3rd multiplier receives the error signal of described error signal maker output and the adjustment step-length of outside input, and the median that tap is upgraded is adjusted in output, sends in each multiplier in the second multiplier group.
3. channel estimating according to claim 2 and balancer is characterized in that, the signal that produces at described local time domain known array generator unit (22) is under the situation of bpsk signal,
Replace described first multiplier group and the described second multiplier group with the first sign reversing module group and the second sign reversing module group.
4. channel estimating according to claim 2 and balancer is characterized in that, the K value in the described time-domain channel estimating unit (20) can be selected the normalization amount of delay after the multipath sampling of the maximum delay that equals to occur in the channel.
5. channel estimating according to claim 1 and balancer is characterized in that, the input of described time-domain channel estimating unit (20) is a time domain known array, and the input and output of described frequency-domain balancing unit (16) are frequency domain datas.
6. channel estimating according to claim 5 and balancer is characterized in that, the time domain known array that described time-domain channel estimating unit (20) is imported can be the PN sequence, and perhaps any one has the known array of pseudorandom feature.
7. the channel estimating of the OFDM of a time domain known array and equalization methods comprise:
Ofdm signal to input carries out synchronously;
Synchronous ofdm signal is separated into time domain known array and data frame two parts;
Carry out channel estimating to separating the time domain known array that obtains;
The channel impulse response and the Frame that estimate are eliminated the known array interference;
Time domain data and the channel pulse impulse response processing that estimates are changed to frequency domain response;
Carry out frequency domain equalization.
8. channel estimating according to claim 7 and equalization methods is characterized in that described method is handled data in time domain, and the output after the described equalization step is frequency domain data.
9. channel estimating according to claim 8 and equalization methods is characterized in that, described time domain known array can be the PN sequence, and perhaps any one has the known array of pseudorandom feature.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710886A (en) * | 2009-12-16 | 2010-05-19 | 中兴通讯股份有限公司 | Method and device for obtaining shock response and frequency offset estimation |
| CN101141426B (en) * | 2007-10-22 | 2011-10-26 | 清华大学 | Channel estimation method used for multi-user multi-aerial system |
| CN102386888A (en) * | 2011-09-28 | 2012-03-21 | 李军 | Point frequency filtering method, device and system |
| CN103812806A (en) * | 2014-02-24 | 2014-05-21 | 北京大学 | Channel equalization method and system based on time domain channel estimation |
| CN104883329A (en) * | 2015-06-17 | 2015-09-02 | 北京华力创通科技股份有限公司 | Method and device for channel estimation and equalization of receiving end in satellite communication |
-
2006
- 2006-08-07 CN CNB2006100297634A patent/CN100525267C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101141426B (en) * | 2007-10-22 | 2011-10-26 | 清华大学 | Channel estimation method used for multi-user multi-aerial system |
| CN101710886A (en) * | 2009-12-16 | 2010-05-19 | 中兴通讯股份有限公司 | Method and device for obtaining shock response and frequency offset estimation |
| CN102386888A (en) * | 2011-09-28 | 2012-03-21 | 李军 | Point frequency filtering method, device and system |
| CN103812806A (en) * | 2014-02-24 | 2014-05-21 | 北京大学 | Channel equalization method and system based on time domain channel estimation |
| CN103812806B (en) * | 2014-02-24 | 2017-10-10 | 北京大学 | A kind of channel equalization method estimated based on time domain channel and system |
| CN104883329A (en) * | 2015-06-17 | 2015-09-02 | 北京华力创通科技股份有限公司 | Method and device for channel estimation and equalization of receiving end in satellite communication |
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