CN101778061B - Receiving system having adaptive channel estimation function and adaptive channel estimator - Google Patents
Receiving system having adaptive channel estimation function and adaptive channel estimator Download PDFInfo
- Publication number
- CN101778061B CN101778061B CN 200910002398 CN200910002398A CN101778061B CN 101778061 B CN101778061 B CN 101778061B CN 200910002398 CN200910002398 CN 200910002398 CN 200910002398 A CN200910002398 A CN 200910002398A CN 101778061 B CN101778061 B CN 101778061B
- Authority
- CN
- China
- Prior art keywords
- signal
- frequency domain
- channel
- domain
- time domain
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention discloses a receiving system having an adaptive channel estimation function, which is suitable to receive a time domain receiving signal through a channel. The receiving system comprises a first converter, an adaptive channel estimator, and an equalizer, wherein the first converter is used for converting the time domain receiving signal into a frequency domain receiving signal; the adaptive channel estimator comprises: a time domain rough estimation device used for roughly estimating the time domain receiving signal and outputting a time domain rough estimation signal, a second converter used for converting the time domain rough estimation signal into a frequency domain rough estimation signal, an error generating device used for calculating a frequency domain channel error based on the frequency domain rough estimation signal and the frequency domain receiving signal, and a feedback device used for compensating the frequency domain rough estimation signal by using the frequency domain channel error so as to estimate a frequency domain channel signal; and the equalizer is used for generating a frequency domain recovery signal according to the frequency domain receiving signal and the frequency domain channel signal. Furthermore, the invention also discloses another two receiving systems and three adaptive channel estimators.
Description
Technical field
The invention relates to a kind of channel estimating technology, refer to especially a kind of receiving system and its adaptability channel estimating and measuring device with adaptive channel estimation function.
Background technology
For the correct signal that receives from the transmission end, receiving terminal can be estimated transmission channel usually, the amplitude and the phase deviation that cause because of channel with compensating signal, and restore corresponding data.Common estimation mode is: adopt decision feedback (decision feedback) technology, judge the decision signal of restoring data, use training (train) again and learn the characteristic of channel.But in the training process, the erroneous decision that can add up consequently is difficult for accurate estimated channel.
And another common estimation mode is: prior to transmission end signal loading guiding (pilot) signal, be subjected to the influence degree of channel to infer the characteristic of channel by receiving terminal according to steering signal again.For example: some carrier wave communication systems can place steering signal before the transmission data in time domain (time domain).And some multi-carrier communications systems can be distributed in steering signal in the transmission data in frequency domain (frequency domain), for example: digital ground visual radio (Digital Video Broadcasting-Terrestrial is called for short DVB-T).
, steering signal can have a deep effect on the channel estimating accuracy, and the steering signal that loads is fewer, and the estimation accuracy is poorer.For instance, elected type B error noise (Pseudo Noise, when PN) sequence is as steering signal, can cause because the rank (tap) of PN sequence number is insufficient auto-correlation (auto-correlation) function can't the desirable residual quantity function (delta function) of complete simulation, therefore estimate the channel impulse response (that is: the time domain specification of channel) that and to produce error.
Can be with reference to Republic of China's patent I279998 number and I248742 patent about the prior art of channel estimating, and with reference to No. 6654429 patent of United States Patent (USP) etc.
Summary of the invention
Therefore, one of the object of the invention is namely providing a kind of receiving system and adaptability channel estimating and measuring device thereof with adaptive channel estimation function, to solve foregoing problems.
So an embodiment of receiving system of the present invention comprises: one first transducer receives signal with a time domain and is converted to frequency domain reception signal; One adaptability channel estimating and measuring device comprises: a time domain rough estimate device receives that signal is estimated and the time domain rough estimate signal of exporting this characteristic of channel of the rough estimation of a representative to this time domain in time domain; One second transducer is converted to a frequency domain rough estimate signal with this time domain rough estimate signal; One error generation device goes out a frequency domain channel error based on this frequency domain rough estimate signal and this frequency domain reception calculated signals; And a feedback device, in frequency domain, come this frequency domain rough estimate signal of feedback compensation with this frequency domain channel error and infer and a frequency domain channel signal that represents this characteristic of channel; And an equalizer, in frequency domain, receive signal and this frequency domain channel signal according to this frequency domain and produce a pair of frequency domain recovering signal that should time domain receives signal.
And another embodiment of receiving system of the present invention comprises: one first transducer receives signal with a time domain and is converted to frequency domain reception signal; One adaptability channel estimating and measuring device comprises: a time domain rough estimate device receives that signal is estimated and the time domain rough estimate signal of exporting this characteristic of channel of the rough estimation of a representative to this time domain in time domain; One second transducer is converted to a frequency domain rough estimate signal with this time domain rough estimate signal; One error generation device goes out a frequency domain channel error based on this frequency domain rough estimate signal and this frequency domain reception calculated signals; One the 3rd decommutator is changed to for the moment territory channel errors with this frequency domain channel error counter-rotating; One feedback device comes this time domain rough estimate signal of feedback compensation with this time domain channel error and infers a time domain channel signal that represents this characteristic of channel in time domain; And one the 6th transducer, this time domain channel signal is converted to a frequency domain channel signal; And an equalizer, in frequency domain, receive signal and this frequency domain channel signal according to this frequency domain and produce a pair of frequency domain recovering signal that should time domain receives signal.
And the another embodiment of receiving system of the present invention comprises: one first transducer receives signal with a time domain and is converted to frequency domain reception signal; One adaptability channel estimating and measuring device comprises: a frequency domain rough estimate device receives that signal is estimated and the frequency domain rough estimate signal of exporting this characteristic of channel of the rough estimation of a representative to this frequency domain in frequency domain; One error generation device goes out a frequency domain channel error based on this frequency domain rough estimate signal and this frequency domain reception calculated signals; And a feedback device, come this frequency domain rough estimate signal of feedback compensation and infer and a frequency domain channel signal that represents this characteristic of channel with this frequency domain channel error; And an equalizer, in frequency domain, receive signal and this frequency domain channel signal according to this frequency domain and produce a pair of frequency domain recovering signal that should time domain receives signal.
A time domain receives signal and a corresponding frequency domain receives signal and an embodiment of adaptability channel estimating and measuring device of the present invention is applicable to receive, comprise: a time domain rough estimate device receives that signal is estimated and the time domain rough estimate signal of exporting this characteristic of channel of the rough estimation of a representative to this time domain in time domain; One second transducer is converted to a frequency domain rough estimate signal with this time domain rough estimate signal; One error generation device goes out a frequency domain channel error based on this frequency domain rough estimate signal and this frequency domain reception calculated signals; And a feedback device, in frequency domain, come this frequency domain rough estimate signal of feedback compensation with this frequency domain channel error and infer and a frequency domain channel signal that represents this characteristic of channel.
A time domain receives signal and a corresponding frequency domain receives signal and another embodiment of adaptability channel estimating and measuring device of the present invention is applicable to receive, comprise: a time domain rough estimate device receives that signal is estimated and the time domain rough estimate signal of exporting this characteristic of channel of the rough estimation of a representative to this time domain in time domain; One second transducer is converted to a frequency domain rough estimate signal with this time domain rough estimate signal; One error generation device goes out a frequency domain channel error based on this frequency domain rough estimate signal and this frequency domain reception calculated signals; One the 3rd decommutator is changed to for the moment territory channel errors with this frequency domain channel error counter-rotating; One feedback device comes this time domain rough estimate signal of feedback compensation with this time domain channel error and infers a time domain channel signal that represents this characteristic of channel in time domain; And one the 6th transducer, this time domain channel signal is converted to a frequency domain channel signal.
And the another embodiment of adaptability channel estimating and measuring device of the present invention is applicable to receive a frequency domain and receives signal, comprising: a frequency domain rough estimate device receives that signal is estimated and the frequency domain rough estimate signal of exporting this characteristic of channel of the rough estimation of a representative to this frequency domain in frequency domain; One error generation device goes out a frequency domain channel error based on this frequency domain rough estimate signal and this frequency domain reception calculated signals; And a feedback device, come this frequency domain rough estimate signal of feedback compensation and infer and a frequency domain channel signal that represents this characteristic of channel with this frequency domain channel error.
Description of drawings
Fig. 1 is a calcspar, and the first preferred embodiment of receiving system of the present invention is described;
Fig. 2 is a calcspar of the first example of error generation device;
Fig. 3 is a calcspar of the second example of error generation device;
Fig. 4 is a calcspar of the 3rd example of error generation device;
Fig. 5 is a calcspar, and the second preferred embodiment of receiving system of the present invention is described;
Fig. 6 is a calcspar, and another realization of the second preferred embodiment is described;
Fig. 7 is a calcspar, and the 3rd preferred embodiment of receiving system of the present invention is described;
Fig. 8 is a calcspar of the first example of error generation device;
Fig. 9 is a calcspar of the second example of error generation device; And
Figure 10 is a calcspar of the 3rd example of error generation device.
The main element symbol description
100～400 receiving systems, 18 low pass filters
1 adaptability channel estimating and measuring device, 2 first transducers
11 time domain rough estimate devices, 3 equalizers
12 second transducers, 4 isochronous controllers
13 feedback devices, 5～7 adaptability channel estimating and measuring devices
14～16 error generation devices, 53 feedback devices
140 decision-making determining devices 55 the 3rd decommutator
141 first decommutators 56 the 6th decommutator
142 time domain decision packages, 71 frequency domain rough estimate devices
143 the 3rd transducers, 74～76 error generation devices
144 dividers, 742 frequency-domain decision unit
145 subtrators, 766 multi-task units
81 transmission ends, 146 Tactic selection unit
153 the 4th transducers, 82 channels
166 multi-task units
Embodiment
The first preferred embodiment
Consult Fig. 1, the first preferred embodiment that it shows receiving system 100 of the present invention is applicable to receive signal r (t) by the time domain that a channel 82 is processed from a transmission end 81.Time domain receives signal r (t) and is loaded with data to be transmitted and the time domain steering signal p (t) that transmission end 81 loads, and transmission end 81 is in time domain time domain just to be sent in time domain steering signal p (t) loading to receive signal r (t).Present embodiment comprises an adaptability channel estimating and measuring device 1, one first transducer 2 and an equalizer 3.Because equalizer 3 is to process in frequency domain, so can inferring, adaptability channel estimating and measuring device 1 a frequency domain channel signal H who represents channel 82 characteristics
Update(f), the first transducer 2 can be changed out a frequency domain and receive signal R (f), produces a pair of frequency domain recovering signal X (f) that answers time domain to receive signal r (t) for equalizer 3.And the first transducer 2 is to receive signal r (t) according to time domain to change, and adaptability channel estimating and measuring device 1 is inferred for effective identification time domain steering signal p (t) specially receives signal r (t) according to time domain.In addition, receiving system 100 also comprises a synchronous controller 4, can receive signal r (t) based on time domain and provide the synchronous operation reference for all component of receiving system 100, also can export the position that a guiding indication is used for notifying time domain steering signal p (t).
Adaptability channel estimating and measuring device 1 comprises a time domain rough estimate device 11, one second transducer 12, a feedback device 13 and an error generation device 14.Time domain rough estimate device 11 is in time domain time domain to be received that signal r (t) estimates and the time domain rough estimate signal h that exports these channel 82 characteristics of the rough estimation of a representative
Rough(t), one embodiment of this time domain rough estimate device 11 is a known channel estimating apparatus, for example the time domain channel estimating apparatus of a decision-directed (decision-directed) or a leading symbol are assisted the time domain channel estimating apparatus of (pilot-symbol-aided), because those known estimating apparatus belong to the common knowledge of the art, so do not repeat them here.Because the error generation device of present embodiment 14 all processes with frequency domain with feedback device 13, so the second transducer 12 can be first with time domain rough estimate signal h
Rough(t) be converted to a frequency domain rough estimate signal H
Rough(f).Then, error generation device 14 is just based on frequency domain rough estimate signal H
Rough(f) and frequency domain receive signal R (f) and calculate a frequency domain channel error delta H (f).And feedback device 13 comes feedback compensation frequency domain rough estimate signal H with frequency domain channel error delta H (f) again
Rough(f) frequency domain channel signal H to infer
Update(f).
What merit attention is that along with the time goes over, time domain receives signal r (t) and sequentially has a plurality of symbols (symbol), frequency domain rough estimate signal H
Rough(f) sequentially have a plurality of data slots of distinguishing corresponding each symbol, and error generation device 14 can calculate respectively corresponding frequency domain channel error delta H (f).And can be the corresponding data fragment of this symbol of compensation according to the frequency domain channel error delta H (f) that a symbol wherein calculates, also can be to compensate the subsequently corresponding data fragment of symbol.
Wherein, the example of error generation device 14 has three.Consult Fig. 2, the first example is to use the selected signal of decision-making of a corresponding frequency domain recovering signal X (f) to calculate frequency domain channel error delta H (f), have decision-making determining device 140, a divider 144 and a subtrator 145, and this decision-making determining device 140 have a time domain decision package 142 (this example refers to a determining device (slicer)), a frequency-domain decision unit 742 (this example refers to a determining device), one first decommutator 141, one the 3rd transducer 143 and a Tactic selection unit 146.
Because transmission end 81 may be with time domain or frequency domain mode data to be transmitted to be loaded time domain reception signal r (t), institute is so that time domain decision package 142 is judged a time domain decision signal in time domain; And make frequency-domain decision unit 742 in frequency domain, judge a frequency-domain decision signal.For and in time domain, make a decision, time domain decision package 142 is after the first decommutator 141 is changed to territory recovering signal x in a period of time (t) with frequency domain recovering signal X (f) counter-rotating by the time, Cai it is judged.And for the frequency-domain decision signal that cooperates frequency-domain decision unit 742 to export, the 3rd transducer 143 can further be done conversion to the time domain decision signal, selects the transformation result of the 3rd transducer 143 or frequency-domain decision signal to work as the selected signal of making decision for Tactic selection unit 146.Then, divider 144 can make frequency domain receive signal R (f) and obtain a frequency domain training signal divided by the selected signal of decision-making, and subtrator 145 deducts it frequency domain rough estimate signal H again
Rough(f) calculate frequency domain channel error delta H (f).Wherein, the selection of Tactic selection unit 146 is based on one and shows that data to be transmitted are the decision-making indications that load at time domain or frequency domain, and if its show that these data to be transmitted are to load in time domain, then select the transformation result of the 3rd transducer 143; If it is presented in the frequency domain and loads, then select the frequency-domain decision signal.
At this, enumerate an example judgement of time domain decision package 142 and frequency-domain decision unit 742 is described: if transmission end 81 is to carry out two-dimentional phase shift keying (Quadrature Phase Shift Keying, QPSK) just send time domain behind the modulation and receive signal r (t), signal can be corresponding to constellation (satellite) figure with four modulation values behind the modulation so, i.e. (1,1), (1 ,-1), (1,1), (1 ,-1).In receiving system 100, these decision packages 142,742 can be according to the distance of received signal and these four modulation values choose wherein that a most close person is used as judged result.And along with the difference of modulation mode, the modulation value number of planisphere can be different, and is certainly also just different as the distance of judging basis.Note that above-mentioned decision package 142,742 embodiment belong to known technology, are not described further in this.And except on open embodiment, the art has knows that usually the knowledgeable can adopt other known or implement this decision package 142,742 through the judgment technology that suitably changes according to explanation of the present invention.
And the second example of error generation device 15 as shown in Figure 3, it is to know in advance in the situation of the time domain steering signal p (t) that transmission end 81 loads at error generation device 15, uses time domain steering signal p (t) to calculate frequency domain channel error delta H (f).Error generation device 15 has one the 4th transducer 153, a divider 144 and a subtrator 145.The 4th transducer 153 is converted to time domain steering signal p (t) first a frequency domain steering signal P (f).At this moment, if the guiding of isochronous controller 4 outputs is designated as 1, divider 144 can make frequency domain receive signal R (f) and obtain the frequency domain training signal divided by frequency domain steering signal P (f).Afterwards, subtrator 145 can deduct frequency domain rough estimate signal H with it
Rough(f) calculate frequency domain channel error delta H (f).If the guiding of isochronous controller 4 outputs is designated as 0, then divider 144 and subtrator 145 do not calculate.Certainly, in another is realized, also can divider 144 and after subtrator 145 calculates, determine whether to export frequency domain channel error delta H (f) according to the guiding indication again.
The 3rd example of error generation device 16 as shown in Figure 4, it is to know in advance in the situation of time domain steering signal p (t) at error generation device 16, and alternately used frequency domain steering signal P (f) and the selected signal of a decision-making calculate frequency domain channel error delta H (f).
In the 3rd example, be to receive frequency domain steering signal P (f) and the selected signal of decision-making with a multi-task unit 166, simultaneously, isochronous controller 4 also can the output steering indication.When guiding is designated as 1, multi-task unit 166 can be selected frequency domain steering signal P (f) is exported; When guiding is designated as 0, the multi-task unit 166 selected signal of can selecting make a strategic decision is exported.Then, offer divider 144 and subtrator 145 calculates, and similar the second example of action carried out of divider 144 and subtrator 145.
In addition, because misjudgment might occur in time domain decision package 142 and frequency-domain decision unit 742, and frequency domain receives the also noise of implicit channel 82 of signal R (f), so adaptability channel estimating and measuring device 1 also comprises a low pass filter 18 (such as Fig. 1), in order to take out low-frequency component the frequency domain channel error delta H (f) that exports from error generation device 14～～16, so that feedback device 13 can compensate frequency domain rough estimate signal H according to this
Rough(f).
Present embodiment with the reason of frequency domain channel error delta H (f) feedback compensation is: allow feedback device 13 have an opportunity to compensate the time domain rough estimate signal h of time domain rough estimate device 11 outputs
Rough(t), make the actual characteristic that more approaches channel 82, and then improve channel estimating accuracy and the effective signal that transmits of reduction transmission end 81.
The second preferred embodiment
Consult Fig. 5, the second preferred embodiment of receiving system 200 of the present invention comprises an adaptability channel estimating and measuring device 5, the first transducer 2, an equalizer 3 and a synchronous controller 4, and adaptability channel estimating and measuring device 5 comprises a time domain rough estimate device 11, one second transducer 12, an error generation device 14, a feedback device 53, one the 3rd decommutator 55, a low pass filter 18 and one the 6th transducer 56.
From the first preferred embodiment different be in: feedback device 53 processes with time domain and infers and a time domain channel signal h
Update(t).So feedback device 53 can receive the time domain rough estimate signal h from time domain rough estimate device 11
RoughAnd receive a time domain channel error delta h (t) from the 3rd decommutator 55 (t).And the 3rd decommutator 55 is after low pass filter 18 takes out low-frequency component from frequency domain channel error delta H (f) by the time, just will carry out inverse transform and process.Infer at feedback device 53 and time domain channel signal h
Update(t) afterwards, the 6th transducer 56 can convert thereof into frequency domain channel signal H
Update(f) and be sent to equalizer 3.
In another example, receiving system 300 is the execution sequence (as shown in Figure 6) of replaceable low pass filter 18 and the 3rd decommutator 55 also, that is: the 3rd decommutator 55 is changed to time domain channel error delta h (t) with frequency domain channel error delta H (f) counter-rotating first, and low pass filter 18 therefrom takes out low-frequency component again to be sent to feedback device 53.
The 3rd preferred embodiment
Consult Fig. 7, the 3rd preferred embodiment of receiving system 400 of the present invention, be applicable to process by a channel 82 the time domain reception signal r (t) of a corresponding transmission end signal, and the transmission end signal has at least one sub-band (sub-band) that is loaded with data to be transmitted and a frequency domain steering signal P (f), and wherein transmission end 81 is will data be transmitted and frequency domain steering signal P (f) loading in frequency domain.
This preferred embodiment comprises an adaptability channel estimating and measuring device 7, the first transducer 2, an equalizer 3 and a synchronous controller 4.The first transducer 2 can receive time domain signal r (t) and change out frequency domain reception signal R (f), and adaptability channel estimating and measuring device 7 is inferred frequency domain channel signal H for effective identification frequency domain steering signal P (f) specially receives signal R (f) according to frequency domain
Update(f), produce frequency domain recovering signal X (f) by equalizer 3 again.And the running of all component of receiving system 400 all relies on isochronous controller 4.
Adaptability channel estimating and measuring device 7 comprises a frequency domain rough estimate device 71, an error generation device 74, a feedback device 13 and a low pass filter 18.Frequency domain rough estimate device 71 is in frequency domain frequency domain to be received signal R (f) to estimate and export a frequency domain rough estimate signal H
Rough(f), one embodiment of this frequency domain rough estimate device 71 is a known frequency domain channel estimating apparatus, for example the frequency domain channel estimating apparatus of a decision-directed (decision-directed) or a leading symbol are assisted the frequency domain channel estimating apparatus of (pilot-symbol-aided), because those known estimating apparatus belong to the common knowledge of the art, so do not repeat them here.And error generation device 74 is based on frequency domain rough estimate signal H
Rough(f) and frequency domain receive signal R (f) and calculate frequency domain channel error delta H (f), and take out low-frequency components by low pass filter 18.And feedback device 13 feedback compensation frequency domain rough estimate signal H according to this again
Rough(f) frequency domain channel signal H to infer
Update(f).
Because transmission end 81 is to load data to be transmitted in frequency domain, so the example of error generation device 74 has a little different from the first preferred embodiment.Consult Fig. 8, the first example has a frequency-domain decision unit 742, a divider 144 and a subtrator 145.Frequency-domain decision unit 742 is judged frequency domain recovering signal X (f) and is obtained the frequency-domain decision signal.Then, divider 144 makes frequency domain receive signal R (f) and obtains a frequency domain training signal divided by the frequency-domain decision signal, and subtrator 145 deducts it frequency domain rough estimate signal H again
Rough(f) calculate frequency domain channel error delta H (f).
And the second example of error generation device 75 as shown in Figure 9, and it only has a divider 144 and a subtrator 145, and isochronous controller 4 more can be exported the guiding indication of a notice sub-band position, frequency domain steering signal P (f) place.When the guiding indication notified a particular sub-band to be loaded with frequency domain steering signal P (f), divider 144 received signal R (f) with frequency domain and obtains the frequency domain training signal divided by frequency domain steering signal P (f).And then by subtrator 145 it is deducted frequency domain rough estimate signal H
Rough(f) calculate frequency domain channel error delta H (f).Certainly, in another is realized, after also can divider 144 calculating with subtrator 145, again according to guiding indication output frequency domain channel error delta H (f).
And the 3rd example of error generation device 76 shown in Figure 10 has more a multi-task unit 766 compared to the first example, and isochronous controller 4 also can be exported this guiding indication.Multi-task unit 766 can be selected to send frequency-domain decision signal or frequency domain steering signal P (f) to divider 144 according to the guiding indication.At last, calculate according to this frequency domain channel error delta H (f) by divider 144 and subtrator 145 again.
Certainly, if time domain receives signal r (t) and is not loaded with any steering signal p (t), error generation device 14 is to select to adopt first example (such as Fig. 2) of the first preferred embodiment to calculate frequency domain channel error delta H (f) so.
And first～the 6th transducer 2,12,143,153,56 of previous embodiment is a fast Fourier transformer (Fast Fourier Transformer, be called for short FFT), the first～the 3rd decommutator 141,55 is an anti-fast Fourier transformer (Inverse Fast Fourier Transformer is called for short IFFT).And it should be noted that the adaptability channel estimating and measuring device 1,5～7th in above-described embodiment, can be independently for receiving system 100～400.
In sum, adaptability channel estimating and measuring device of the present invention and receiving system are calculated frequency domain channel error delta H (f) by error generation device 14～16,74～76 based on frequency domain recovering signal X (f), frequency domain steering signal P (f) or time domain steering signal p (t), output with compensation time domain rough estimate device 11, frequency domain rough estimate device 71, and then improve the channel estimating accuracy, so really can reach purpose of the present invention.
The above person of thought, it only is preferred embodiment of the present invention, when not limiting scope of the invention process with this, the simple equivalence of namely generally doing according to the present patent application claim and invention description content changes and modifies, and all still belongs in the scope that patent of the present invention contains.
Claims (26)
1. a receiving system is applicable to receive a time domain by a channel and receives signal, comprises:
One first transducer receives signal with this time domain and is converted to frequency domain reception signal;
One adaptability channel estimating and measuring device comprises:
One time domain rough estimate device receives that signal is estimated and the time domain rough estimate signal of exporting this characteristic of channel of the rough estimation of a representative to this time domain in time domain;
One second transducer is converted to a frequency domain rough estimate signal with this time domain rough estimate signal;
One error generation device goes out a frequency domain channel error based on this frequency domain rough estimate signal and this frequency domain reception calculated signals; And
One feedback device comes this frequency domain rough estimate signal of feedback compensation with this frequency domain channel error and infers a frequency domain channel signal that represents this characteristic of channel in frequency domain; And
One equalizer receives signal and this frequency domain channel signal according to this frequency domain and produces a pair of frequency domain recovering signal that should time domain receives signal in frequency domain.
2. receiving system as claimed in claim 1, wherein, this error generation device has:
One decision-making determining device is judged the selected signal of a decision-making based on this frequency domain recovering signal;
One divider receives signal according to this frequency domain and obtains a frequency domain training signal with the selected signal of this decision-making; And
One subtrator deducts this frequency domain rough estimate signal with this frequency domain training signal and calculates this frequency domain channel error.
3. receiving system as claimed in claim 2 is applicable to receive a decision-making indication, and wherein, this decision-making determining device has:
A frequency-domain decision signal is judged based on this frequency domain recovering signal in one frequency-domain decision unit in frequency domain;
One first decommutator is changed to for the moment territory recovering signal with this frequency domain recovering signal counter-rotating;
One time domain decision package is judged a time domain decision signal based on this time domain recovering signal in time domain;
One the 3rd transducer is changed this time domain decision signal; And
One Tactic selection unit selects the output of the 3rd transducer or this frequency-domain decision signal to be used as the selected signal of this decision-making based on this decision-making indication.
4. receiving system as claimed in claim 1, this time domain receives signal and is loaded with a time domain steering signal, and this receiving system also comprises a synchronous controller, and output one notifies the guiding of this time domain steering signal position to indicate;
Wherein, this error generation device has one the 4th transducer, a divider and a subtrator, and the 4th transducer is converted to a frequency domain steering signal with this time domain steering signal; And based on this guiding indication, this divider can make this frequency domain receive signal and obtain a frequency domain training signal divided by this frequency domain steering signal, and then, this subtrator can deduct this frequency domain training signal this frequency domain rough estimate signal and calculate this frequency domain channel error.
5. receiving system as claimed in claim 3, this time domain receives signal and is loaded with a time domain steering signal, and wherein, this receiving system also comprises a synchronous controller, and output one notifies the guiding of this time domain steering signal position to indicate; And this error generation device has more one the 4th transducer and a multi-task unit;
The 4th transducer is converted to a frequency domain steering signal with this time domain steering signal, and this multi-task unit selects this frequency domain steering signal of output maybe to be somebody's turn to do the selected signal of decision-making based on this guiding indication, and this divider is to make this frequency domain receive signal to obtain a frequency domain training signal divided by the output of this multi-task unit.
6. receiving system as claimed in claim 1, wherein, this adaptability channel estimating and measuring device also comprises a low pass filter, take out first the low-frequency component of this frequency domain channel error after, just be sent to this feedback device.
7. a receiving system is applicable to receive a time domain by a channel and receives signal, comprises:
One first transducer receives signal with this time domain and is converted to frequency domain reception signal;
One adaptability channel estimating and measuring device comprises:
One time domain rough estimate device receives that signal is estimated and the time domain rough estimate signal of exporting this characteristic of channel of the rough estimation of a representative to this time domain in time domain;
One second transducer is converted to a frequency domain rough estimate signal with this time domain rough estimate signal;
One error generation device goes out a frequency domain channel error based on this frequency domain rough estimate signal and this frequency domain reception calculated signals;
One the 3rd decommutator is changed to for the moment territory channel errors with this frequency domain channel error counter-rotating;
One feedback device comes this time domain rough estimate signal of feedback compensation with this time domain channel error and infers a time domain channel signal that represents this characteristic of channel in time domain; And
One the 6th transducer is converted to a frequency domain channel signal with this time domain channel signal; And
One equalizer receives signal and this frequency domain channel signal according to this frequency domain and produces a pair of frequency domain recovering signal that should time domain receives signal in frequency domain.
8. receiving system as claimed in claim 7, wherein, this adaptability channel estimating and measuring device also comprises a low pass filter, take out first the low-frequency component of this frequency domain channel error after, just be sent to this feedback device.
9. a receiving system is applicable to receive a time domain by a channel and receives signal, comprises:
One first transducer receives signal with this time domain and is converted to frequency domain reception signal;
One adaptability channel estimating and measuring device comprises:
One frequency domain rough estimate device receives that signal is estimated and the frequency domain rough estimate signal of exporting this characteristic of channel of the rough estimation of a representative to this frequency domain in frequency domain;
One error generation device goes out a frequency domain channel error based on this frequency domain rough estimate signal and this frequency domain reception calculated signals; And
One feedback device comes this frequency domain rough estimate signal of feedback compensation and infers a frequency domain channel signal that represents this characteristic of channel with this frequency domain channel error; And
One equalizer receives signal and this frequency domain channel signal according to this frequency domain and produces a pair of frequency domain recovering signal that should time domain receives signal in frequency domain.
10. receiving system as claimed in claim 9, wherein, this error generation device has:
A frequency-domain decision signal is judged based on this frequency domain recovering signal in one frequency-domain decision unit;
One divider makes this frequency domain receive signal and obtains a frequency domain training signal divided by this frequency-domain decision signal; And
One subtrator deducts this frequency domain rough estimate signal with this frequency domain training signal and calculates this frequency domain channel error.
11. receiving system as claimed in claim 9, this time domain receives signal and has at least one sub-band that is loaded with a frequency domain steering signal, wherein, this receiving system also comprises a synchronous controller, and the guiding indication of this sub-band position, frequency domain steering signal place is notified in output one;
This error generation device has a divider and a subtrator, when this guiding indication notifies a particular sub-band to be loaded with this frequency domain steering signal, this divider receives signal with this frequency domain and obtains a frequency domain training signal divided by this frequency domain steering signal, and this subtrator deducts this frequency domain training signal this frequency domain rough estimate signal again and calculates this frequency domain channel error.
12. receiving system as claimed in claim 10, this time domain receives signal and has at least one sub-band that is loaded with a frequency domain steering signal, wherein, this receiving system also comprises a synchronous controller, and the guiding indication of this sub-band position, frequency domain steering signal place is notified in output one;
And this error generation device has more a multi-task unit, selects this frequency domain steering signal of output or this frequency-domain decision signal based on this guiding indication, calculates for this divider.
13. receiving system as claimed in claim 9, wherein, this adaptability channel estimating and measuring device also comprises a low pass filter, take out first the low-frequency component of this frequency domain channel error after, just be sent to this feedback device.
14. an adaptability channel estimating and measuring device is applicable to receive that a time domain by a channel receives signal and a pair of frequency domain that should time domain receives signal receives signal, comprising:
One time domain rough estimate device receives that signal is estimated and the time domain rough estimate signal of exporting this characteristic of channel of the rough estimation of a representative to this time domain in time domain;
One second transducer is converted to a frequency domain rough estimate signal with this time domain rough estimate signal;
One error generation device goes out a frequency domain channel error based on this frequency domain rough estimate signal and this frequency domain reception calculated signals; And
One feedback device comes this frequency domain rough estimate signal of feedback compensation with this frequency domain channel error and infers a frequency domain channel signal that represents this characteristic of channel in frequency domain.
15. adaptability channel estimating and measuring device as claimed in claim 14, wherein, this error generation device has:
One decision-making determining device is judged the selected signal of a decision-making based on this frequency domain recovering signal;
One divider receives signal according to this frequency domain and obtains a frequency domain training signal with the selected signal of this decision-making; And
One subtrator deducts this frequency domain rough estimate signal with this frequency domain training signal and calculates this frequency domain channel error.
16. adaptability channel estimating and measuring device as claimed in claim 15 is applicable to receive a decision-making indication, wherein, this decision-making determining device has:
A frequency-domain decision signal is judged based on this frequency domain recovering signal in one frequency-domain decision unit in frequency domain;
One first decommutator is changed to for the moment territory recovering signal with this frequency domain recovering signal counter-rotating;
One time domain decision package is judged a time domain decision signal based on this time domain recovering signal in time domain;
One the 3rd transducer is changed this time domain decision signal; And
One Tactic selection unit selects the output of the 3rd transducer or this frequency-domain decision signal to be used as the selected signal of this decision-making based on this decision-making indication.
17. adaptability channel estimating and measuring device as claimed in claim 14, this time domain receives signal and is loaded with a time domain steering signal, and more is applicable to receive a guiding indication of notifying this time domain steering signal position;
Wherein, this error generation device has one the 4th transducer, a divider and a subtrator, and the 4th transducer is converted to a frequency domain steering signal with this time domain steering signal; And based on this guiding indication, this divider can make this frequency domain receive signal and obtain a frequency domain training signal divided by this frequency domain steering signal, and then, this subtrator can deduct this frequency domain training signal this frequency domain rough estimate signal and calculate this frequency domain channel error.
18. adaptability channel estimating and measuring device as claimed in claim 16, this time domain receives signal and is loaded with a time domain steering signal, and more is applicable to receive a guiding indication of notifying this time domain steering signal position; And this error generation device has more one the 4th transducer and a multi-task unit;
The 4th transducer is converted to a frequency domain steering signal with this time domain steering signal, and this multi-task unit selects this frequency domain steering signal of output maybe to be somebody's turn to do the selected signal of decision-making based on this guiding indication, and this divider is to make this frequency domain receive signal to obtain a frequency domain training signal divided by the output of this multi-task unit.
19. adaptability channel estimating and measuring device as claimed in claim 14 also comprises a low pass filter, take out first the low-frequency component of this frequency domain channel error after, just be sent to this feedback device.
20. an adaptability channel estimating and measuring device is applicable to receive that a time domain by a channel receives signal and a pair of frequency domain that should time domain receives signal receives signal, comprising:
One time domain rough estimate device receives that signal is estimated and the time domain rough estimate signal of exporting this characteristic of channel of the rough estimation of a representative to this time domain in time domain;
One second transducer is converted to a frequency domain rough estimate signal with this time domain rough estimate signal;
One error generation device goes out a frequency domain channel error based on this frequency domain rough estimate signal and this frequency domain reception calculated signals;
One the 3rd decommutator is changed to for the moment territory channel errors with this frequency domain channel error counter-rotating;
One feedback device comes this time domain rough estimate signal of feedback compensation with this time domain channel error and infers a time domain channel signal that represents this characteristic of channel in time domain; And
One the 6th transducer is converted to a frequency domain channel signal with this time domain channel signal.
21. adaptability channel estimating and measuring device as claimed in claim 20 also comprises a low pass filter, take out first the low-frequency component of this frequency domain channel error after, just be sent to this feedback device.
22. an adaptability channel estimating and measuring device is applicable to receive a frequency domain by a channel and receives signal, comprising:
One frequency domain rough estimate device receives that signal is estimated and the frequency domain rough estimate signal of exporting this characteristic of channel of the rough estimation of a representative to this frequency domain in frequency domain;
One error generation device goes out a frequency domain channel error based on this frequency domain rough estimate signal and this frequency domain reception calculated signals; And
One feedback device comes this frequency domain rough estimate signal of feedback compensation and infers a frequency domain channel signal that represents this characteristic of channel with this frequency domain channel error.
23. adaptability channel estimating and measuring device as claimed in claim 22, wherein, this error generation device has:
A frequency-domain decision signal is judged based on this frequency domain recovering signal in one frequency-domain decision unit;
One divider makes this frequency domain receive signal and obtains a frequency domain training signal divided by this frequency-domain decision signal; And
One subtrator deducts this frequency domain rough estimate signal with this frequency domain training signal and calculates this frequency domain channel error.
24. adaptability channel estimating and measuring device as claimed in claim 22, this frequency domain receive signal and have at least one sub-band that is loaded with a frequency domain steering signal, and more are applicable to receive a guiding indication of notifying this sub-band position, frequency domain steering signal place;
This error generation device has a divider and a subtrator, when this guiding indication notifies a particular sub-band to be loaded with this frequency domain steering signal, this divider receives signal with this frequency domain and obtains a frequency domain training signal divided by this frequency domain steering signal, and this subtrator deducts this frequency domain training signal this frequency domain rough estimate signal again and calculates this frequency domain channel error.
25. adaptability channel estimating and measuring device as claimed in claim 22, this frequency domain receive signal and have at least one sub-band that is loaded with a frequency domain steering signal, and more are applicable to receive a guiding indication of notifying this sub-band position, frequency domain steering signal place;
And this error generation device has more a multi-task unit, selects this frequency domain steering signal of output or this frequency-domain decision signal based on this guiding indication, calculates for this divider.
26. adaptability channel estimating and measuring device as claimed in claim 22 also comprises a low pass filter, take out first the low-frequency component of this frequency domain channel error after, just be sent to this feedback device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910002398 CN101778061B (en) | 2009-01-12 | 2009-01-12 | Receiving system having adaptive channel estimation function and adaptive channel estimator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910002398 CN101778061B (en) | 2009-01-12 | 2009-01-12 | Receiving system having adaptive channel estimation function and adaptive channel estimator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101778061A CN101778061A (en) | 2010-07-14 |
| CN101778061B true CN101778061B (en) | 2013-01-30 |
Family
ID=42514392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910002398 Active CN101778061B (en) | 2009-01-12 | 2009-01-12 | Receiving system having adaptive channel estimation function and adaptive channel estimator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101778061B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1082279A (en) * | 1992-06-23 | 1994-02-16 | 艾利森电话股份有限公司 | A kind of method and apparatus of in the receiver of digital data transmission, estimating the symbol that transmitted |
| EP0892504A2 (en) * | 1997-07-14 | 1999-01-20 | CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A. | Method of and apparatus for digital radio signal reception |
| WO2003046888A1 (en) * | 2001-11-29 | 2003-06-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Decoding method for a delta modulated signal |
| CN1457152A (en) * | 2002-05-10 | 2003-11-19 | 株式会社Ntt都科摩 | Wireless communication device and wireless communication method |
| CN101232487A (en) * | 2007-01-23 | 2008-07-30 | 联发科技股份有限公司 | Multi-path receiving system and adaptability channel estimating and measuring method |
| CN101257471A (en) * | 2008-03-31 | 2008-09-03 | 浙江大学 | Mobile multimedia digital broadcast OFDM system channel estimation method |
-
2009
- 2009-01-12 CN CN 200910002398 patent/CN101778061B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1082279A (en) * | 1992-06-23 | 1994-02-16 | 艾利森电话股份有限公司 | A kind of method and apparatus of in the receiver of digital data transmission, estimating the symbol that transmitted |
| EP0892504A2 (en) * | 1997-07-14 | 1999-01-20 | CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A. | Method of and apparatus for digital radio signal reception |
| WO2003046888A1 (en) * | 2001-11-29 | 2003-06-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Decoding method for a delta modulated signal |
| CN1457152A (en) * | 2002-05-10 | 2003-11-19 | 株式会社Ntt都科摩 | Wireless communication device and wireless communication method |
| CN101232487A (en) * | 2007-01-23 | 2008-07-30 | 联发科技股份有限公司 | Multi-path receiving system and adaptability channel estimating and measuring method |
| CN101257471A (en) * | 2008-03-31 | 2008-09-03 | 浙江大学 | Mobile multimedia digital broadcast OFDM system channel estimation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101778061A (en) | 2010-07-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101325569B (en) | Robust channel evaluation for communication system | |
| CN1981498B (en) | Staggered pilot transmission for channel estimation and time tracking | |
| JP4421635B2 (en) | Wireless communication method and wireless communication device | |
| CN108881085B (en) | Method and system for estimating carrier frequency offset | |
| CN101379722B (en) | Equalization device and equalization method | |
| US8447001B2 (en) | Apparatus for performing channel estimation in a receiving device | |
| JP4637498B2 (en) | Communication apparatus and communication method | |
| CN101663832B (en) | Frequency error estimation algorithm | |
| US7424062B2 (en) | Efficient doppler compensation method and receiver for orthogonal-frequency-division-multiplexing (OFDM) systems | |
| CN102318304A (en) | Post-DTF/FFT time tracking algorithm for OFDM receivers | |
| US20170265202A1 (en) | Time domain pilot of single-carrier mimo system and synchronization method thereof | |
| CN100544338C (en) | Be used for detecting the equipment and the method for echo at frequency domain | |
| CN105162533B (en) | Transmitter amplitude imbalance and phase imbalance measuring method | |
| CN100512259C (en) | Method for transmitting signal of offset orthogonal amplitude modulation system | |
| EP2129017A1 (en) | Reception device and reception method | |
| CN106789791A (en) | GSM carrier frequency bias estimation based on conjugation symmetric training sequence | |
| TWI653841B (en) | Carrier frequency offset estimation device and carrier frequency offset estimation method | |
| CN103338166B (en) | A kind of channel estimation methods of improvement | |
| CN101778061B (en) | Receiving system having adaptive channel estimation function and adaptive channel estimator | |
| CN104796370A (en) | Signal synchronization method and system for underwater acoustic communication and underwater acoustic communication system | |
| CN107426121A (en) | Training sequence design and application process and device for broad sense Frequency Division Multiplexing system | |
| CN101621489A (en) | Channel estimation method for four-phase modulation system | |
| KR101063072B1 (en) | Integer Frequency Error Estimation System and Method in WiBro System | |
| CN104717045A (en) | Pilot frequency configuration determination method and base station | |
| EP2704383B1 (en) | Method and device for improving a home network making use of an adaptive guard interval |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |