CN106487723A - Channel estimation methods and device suitable for single antenna interference cancellation technology - Google Patents
Channel estimation methods and device suitable for single antenna interference cancellation technology Download PDFInfo
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- CN106487723A CN106487723A CN201510550912.0A CN201510550912A CN106487723A CN 106487723 A CN106487723 A CN 106487723A CN 201510550912 A CN201510550912 A CN 201510550912A CN 106487723 A CN106487723 A CN 106487723A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
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Abstract
The present invention provides a kind of channel estimation methods suitable for single antenna interference cancellation technology, including signal is obtained burst estimate by preequalization；The sequence estimation value is reduced into the form of a burst sequence, while direction determining is determined by signal energy；And the reference value according to the burst sequence for obtaining and the direction determining, self adaptation sequence estimation is executed to half edge sequence comprising training sequence.The method of the present invention is comprising pretreatment, sequence reduction and direction determining, three part of adaptive channel estimation.The present invention also provides a kind of channel estimating apparatus suitable for single antenna interference cancellation technology, can adapt to, in the single antenna interference cancellation technology of decoupling linear filtering nonlinear equalization method, improve and eliminate performance to asynchronous interference.
Description
Technical field
The present invention relates to wireless communication technology field, more particularly to a kind of suitable for single antenna interference cancellation technology
Channel estimation methods and device.
Background technology
Co-channel interference (CCI, co-channel interference) be as multiple users are in identical channel
Transmission information and produce.In the gsm system of adjacent cell communication, co-channel interference is done as a kind of main
Disturb and have to consideration.For the condition of terminal in downgoing line, single antenna interference cancellation technology (SAIC,
Single-antenna-interference-cancellation) it is undoubtedly a kind of reasonable solution co-channel interference suppression
The method of problem.
Conventional SAIC method has MIC (Mono Interference Cancellation), joint-detection, goes
A few big class methods such as coupling linear filtering nonlinear equalization, the MIC free degree are not enough, and use condition is harsh, especially
The interference signal of 8PSK modulation is not adapted to, and joint-detection suppression interference performance is strong, but complexity is high, because
This considers performance and complexity, it is possible to use decouple linear filtering nonlinear equalization method to suppress interference.
As the method is without the need for the channel situation of estimated disturbance signal, therefore can reduce complexity, simultaneously because should
Method can be simultaneously suitable for the signal of GMSK modulation and 8PSK modulation to the insensitive of modulation type,
Applicable surface is wider than MIC.
From the point of view of the principle of decoupling linear filtering nonlinear equalization technology, the AF panel performance of the method is improved,
Can start with terms of three, one is to improve filter coefficient generation method, improves filtering performance, and two is to make
With closer to the channel estimation value for expecting channel, three is to provide longer reference on the basis of original training sequence
Sequence.Wherein, the latter two be in order to, under fixed filters coefficient generation method, more effectively be filtered
Device coefficient.Due to there is asynchronous interference, merely channel impulse response is estimated by training sequence, reliability can under
Drop, may introduce interference and cause the larger deviation of result to expect channel estimation value, it is therefore desirable in channel estimation
On make improvement so that channel estimation value closer to expect channel value, improve decoupling linear filter right
The rejection ability of asynchronous interference.
Content of the invention
For solving the problems, such as prior art, the present invention provides a kind of suitable for single antenna interference cancellation technology
Channel estimation methods, including：
Signal is obtained burst estimate by preequalization；
The sequence estimation value is reduced into the form of a burst sequence, while by signal energy determination side
To judgement；And
According to reference value and the direction determining of the burst sequence for obtaining, to the half of sequence comprising training sequence
Row execute self adaptation sequence estimation.
Optionally, during direction determining being determined by signal energy, former burst is divided into a left side from intermediate point
Right each length is half sequence of 78 symbols, calculates the average power content on both sides respectively, obtains the flat of the right and left
All power ratio, selectes adaptive direction for the less direction of mean power.
Optionally, after the adaptive direction is selected, the self adaptation side is differed from from the training sequence
To side proceed by adaptive channel estimation, described adaptive from differing from again after the completion of adaptive channel estimation
The side in direction is answered to proceed by iteration.
Optionally, according to the size of half sequence average power ratio of both sides, the ratio for belonging to intermediate zone is introduced
Scope, within the range, judges only to do the adaptive channel estimation of training sequence section.
Optionally, the first time channel estimation value of signal, before burst estimate is obtained, is obtained；?
In the self adaptation sequence estimation, according to the step-length of the direction determining more new estimation, and with the first time
Channel estimation value is used as the initial value of self adaptation sequence estimation.
Optionally, the first time channel estimation value of the signal is obtained using LS method of estimation.
Optionally, when direction being judged as intermediate zone, only ART network is done to training sequence section, from training
Start to do iteration until training sequence low order end on the left of tract.
Optionally, when executing the self adaptation sequence estimation, using LMS adaptive approach, test point is selected
Before and after surrounding, the gradient linearity mean value of each 2-3 point is used as the Grad of Chosen Point.
Optionally, the method for the form that the burst estimate is reduced into burst is to add bit end to end,
Add the training sequence at middle part, then GMSK or 8PSK is carried out according to the modulation format of desired signal
Modulation.
A kind of channel estimating apparatus suitable for single antenna interference cancellation technology, including：
The device of signal preequalization, for carrying out signal preequalization to obtain burst estimate；
For the sequence estimation value to be reduced into the device of a burst sequence form；
For calculate signal energy and determine adaptive direction judge device；And
For being carried out to half edge sequence comprising training sequence according to the reference value of burst sequence and adaptive direction
The device of self adaptation sequence estimation.
Optionally, during determining that adaptive direction judges by signal energy, by former burst from intermediate point
It is divided into half sequence that each length around is 78 symbols, calculates the average power content on both sides respectively, obtains left and right two
The average power ratio on side, it is the less direction of mean power to select adaptive direction.
Optionally, after the adaptive direction is selected, the self adaptation side is differed from from the training sequence
To side proceed by adaptive channel estimation, described adaptive from differing from again after the completion of adaptive channel estimation
The side in direction is answered to proceed by iteration.
Optionally, according to the size of half sequence average power ratio of both sides, the ratio for belonging to intermediate zone is introduced
Scope, within the range, judges only to do the adaptive channel estimation of training sequence section.
Optionally, the first time channel estimation value of signal, before burst estimate is obtained, is obtained；?
In the self adaptation sequence estimation, according to the step-length of the direction determining more new estimation, and with the first time
Channel estimation value is used as the initial value of self adaptation sequence estimation.
Optionally, the first time channel estimation value of the signal is obtained using LS method of estimation.
Optionally, when direction being judged as intermediate zone, only ART network is done to training sequence section, from training
Start to do iteration until training sequence low order end on the left of tract.
Optionally, when executing the self adaptation sequence estimation, using LMS adaptive approach, test point is selected
Before and after surrounding, the gradient linearity mean value of each 2-3 point is used as the Grad of Chosen Point.
Optionally, the method that the burst estimate is reduced into burst sequence form is to add bit end to end,
Add the training sequence at middle part, then GMSK or 8PSK is carried out according to the modulation format of desired signal
Modulation.
The present invention provides a kind of channel estimation methods suitable for single antenna interference cancellation technology, including by signal
Burst estimate is obtained by preequalization；The sequence estimation value is reduced into the shape of a burst sequence
Formula, while determine direction determining by signal energy；And the reference value according to the burst sequence for obtaining and institute
Direction determining is stated, self adaptation sequence estimation is executed to half edge sequence comprising training sequence.The method of the present invention
Comprising pretreatment, sequence reduction and direction determining, three part of adaptive channel estimation, can adapt in decoupling
The single antenna interference cancellation technology of linear filtering nonlinear equalization method, improves and eliminates performance to asynchronous interference.
Description of the drawings
Fig. 1 is to decouple linear filtering nonlinear equalization SAIC structural representation described in one embodiment of the invention；
Fig. 2 is the flow chart of the channel estimation methods of single antenna interference cancellation technology described in one embodiment of the invention；
Fig. 3 is self adaptation in the channel estimation methods of single antenna interference cancellation technology described in one embodiment of the invention
Channel estimation set direction flow chart；
Fig. 4 A～4D corresponds to the channel estimation side of single antenna interference cancellation technology described in one embodiment of the invention respectively
In method, desired signal is by synchronous co-channel interference, it is desirable to which signal section data segment is not interfered with, it is desirable to signal half quilt
Interference is covered, it is desirable to the not disturbed 4 kinds of typical case of signal training sequence section；
Fig. 5 is to expect letter in the channel estimation methods of single antenna interference cancellation technology described in one embodiment of the invention
Number by synchronous co-channel interference BER curve；
Fig. 6 is to expect letter in the channel estimation methods of single antenna interference cancellation technology described in one embodiment of the invention
The BER curve that number partial data section is not interfered with；
Fig. 7 is to expect letter in the channel estimation methods of single antenna interference cancellation technology described in one embodiment of the invention
The BER curve of number disturbed covering of half；
Fig. 8 is to expect letter in the channel estimation methods of single antenna interference cancellation technology described in one embodiment of the invention
Number not disturbed BER curve of training sequence section.
Specific embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.According to following explanation and
Claims, advantages and features of the invention will become apparent from.It should be noted that, accompanying drawing is all using very simple
The form of change and all using non-accurately ratio, only in order to convenient, lucidly aid in illustrating the embodiment of the present invention
Purpose.
Single antenna interference cancellation technology suitable for decoupling linear filtering nonlinear equalization proposed by the present invention
(SAIC) channel estimating apparatus, position such as Fig. 1 in decoupling linear filtering nonlinear equalization SAIC system
102 shown in, effect is that the bit for being divided into 2 road haploidy number evidences after two sampling of step 101 is carried out respectively
Channel estimation, is that the CCI filtering of step 103 provides channel estimation value.Step 102 is the tool of channel estimation
Body implementation is as follows：
The canonical form for arranging reception signal r first is as follows
Wherein, r (n) is the nth symbol for receiving signal, and h is to expect channel impulse response, and a is to expect sequence
Row, g is the impulse response of i-th interference user, and b is the sequence of i-th user, and n (n) is white Gaussian noise.
Then, flow process as shown in Figure 2 carries out the running of corresponding module.
1st, pre-estimation is carried out in step 202 to the bit that step 201 is received and obtains the first channel estimation value.Should
Step channel estimation adopts most basic LS channel estimation, is the accuracy for improving channel estimation value, can adopt
26 points of correlations carry out estimation to replace 16 points of correlation estimations, obtain channel estimation value
hLS=(ATA)-1Ar (1-2)
2nd, in step 203, the channel obtained by step 202 estimates evaluation hLSThe reception obtained with step 201
Sequence r carries out preequalization, as equalization methods, adopts MLSE for GMSK signal, and 8PSK is believed
Number then RSSE or DFSE is adopted, obtain the first estimate a of expectation sequence.
3rd, the form of burst in step 204, is expected by the first estimate a of the expectation sequence reduction for obtaining.Tool
Body method is to add bit end to end, adds the training sequence at middle part, then according to the modulation format of desired signal
GMSK or 8PSK modulation is carried out, obtains the burst estimate for subsequent reference
4th, in step 205, adaptive direction judgement is done according to receiving sequence.By the Burst that length is 156
It is divided into left and right two parts from centre, each 78 points, calculate the average power content on both sides respectively, obtain left and right two
The average power ratio on side
As the concrete boundary position of interference need not be known, therefore the algorithm for being accurately positioned interference need not be adopted,
But only the size of the right and left average power ratio need to be judged, determine direction.Criterion is with a boundary
Limit n (n>1) it is reference point, is divided into p≤1/n, 1/n<p<N, p >=tri- kinds of n situation, the first does self adaptation to the left
Estimate, the third does ART network to the right, be for second intermediate zone, adaptive range is limited to training sequence
In the range of row.When n is obtained too close to 1, then excessively sensitive walking direction can cause self adaptation to be difficult to restrain,
N acquirement is excessive, is unfavorable for handling it asynchronous interference situation.
5 next, in step 206, carry out LMS adaptive channel estimation, with the h that step 202 is obtainedLS
The initial value being worth for channel estimation, with the sequence reducing value of step 204For adaptive reference sequential value, with step
Rapid 205 walking direction value is adaptive iteration traversal direction.The adaptive channel estimation of choice direction is concrete
Flow process is as shown in Figure 3：
(1) by step 205 adaptive iteration traversal direction judgment value, it is determined whether be in intermediate zone, if
It is, then execution step 303, otherwise, execution step 302.
(2) now execution step 303, then adaptive range be limited to training sequence section, step 303 updates
Adaptive step, step 304 take a group of the high order end of training sequence sectionAnd it is correspondingDo from the leftmost side of training sequence to the training sequence rightmost side
Adaptive channel estimation, iterative be
Wherein μ is step-length, determines convergence rate and last error.The size of μ, be most preferably in theory
Wherein, λmaxIt is the auto-correlation function matrix R of the training sequence section of receiving sequence rXEigenvalue of maximum,
λminIt is the auto-correlation function matrix R of receiving sequence rXMinimal eigenvalue.Actual value is by test result in this base
It is adjusted on plinth.
ε (n) is expressed as
It is evaluated error value.
(3) if not intermediate zone, then execution step 302, determine whether to carry out to the left or to the right
Self adaptation ergodic process.By taking a left side as an example, then execution step 305, first, update adaptive step μ, algorithm
With (1-5), then, execution step 306, takes training sequence low order end for one group of starting point
And it is correspondingFrom the rightmost side of training sequence to
Adaptive channel estimation is done in the burst sequence leftmost side, iterative with (1-4).If it is determined that direction is for the right,
Then by step 307 and step 308, self adaptation is done in the rightmost side from the leftmost side of training sequence to burst sequence
Channel estimation.
(4), in ergodic process, it is that adaptive convergence is improved, weakens interference border and bursty interference pair
Adaptive impact, in step 304, in 306,308, to the Grad in self adaptationCarry out smoothing behaviour
Make.Smooth operation take in the form of linear average, that is, the average of the gradient of a segment value come replace original certain
The Grad of individual point.If the Grad of current self adaptation point is Nk, then length is taken for the Grad in L section
Obtain average to replace former Grad.Then, actual gradient value is changed into
Traveling through every time, then judged whether iterations is had been maxed out, if reaching, having terminated, output
Updated channel impulse response valueOtherwise, then continue from the beginning of starting point, try again traversal.
Fig. 5～8 show under TU50 channel, SNR=25dB, do not do at SAIC and ART network
Reason, SAIC process, the BER curve comparison diagram of SAIC+ adaptive channel estimation three kinds of situations of process.Figure
5～Fig. 8 is that interference signal postpones 0,30%, 50%, 70% respectively, as shown in Fig. 4 A～D, represents according to this
Desired signal is by synchronous interference, desired signal partial data is undisturbed, desired signal half is disturbed, the phase
Hope the not disturbed four kinds of typical case of signal training sequence section.Instruction is not covered when interference is close to synchronous or interference
When practicing tract, it is basically identical to have or not LMS ART network result, and reason is now directly in training sequence
Row section is estimated that as a result closer to perfect estimation value, and when interference offsets, adaptive channel is estimated
More multiple reference pointses (in addition to training sequence) are utilized by meter using the information of non-cover jamming section,
Channel estimation quality can be improved, so as to improve performance.Therefrom show, the present invention can tackle asynchronous with
Road shows reasonable gain when disturbing.
The present invention also provides a kind of channel estimating apparatus suitable for single antenna interference cancellation technology, including：
The device of signal preequalization, for carrying out signal preequalization to obtain burst estimate；
For the sequence estimation value to be reduced into the device of a burst sequence；
For signal both sides average power content is calculated, the device of adaptive direction is judged；And
For being carried out to half edge sequence comprising training sequence according to the reference value of burst sequence and adaptive direction
The device of adaptive channel estimation.
The present invention provides a kind of channel estimation methods suitable for single antenna interference cancellation technology, including by signal
Burst estimate is obtained by preequalization；The sequence estimation value is reduced into the shape of a burst sequence
Formula, while determine direction determining by signal energy；And the reference value according to the burst sequence for obtaining and institute
Direction determining is stated, self adaptation sequence estimation is executed to half edge sequence comprising training sequence.The method of the present invention
Comprising pretreatment, sequence reduction and direction determining, three part of adaptive channel estimation, can adapt in decoupling
The single antenna interference cancellation technology of linear filtering nonlinear equalization method, improves and eliminates performance to asynchronous interference.
Obviously, those skilled in the art can carry out various changes and modification without deviating from the present invention to invention
Spirit and scope.So, if the present invention these modification and modification belong to the claims in the present invention and its
Within the scope of equivalent technologies, then the present invention is also intended to including including these changes and modification.
Claims (18)
1. a kind of channel estimation methods suitable for single antenna interference cancellation technology, it is characterised in that include：
Signal is obtained burst estimate by preequalization；
The sequence estimation value is reduced into the form of a burst sequence, while by signal energy determination side
To judgement；And
According to reference value and the direction determining of the burst sequence for obtaining, to the half of sequence comprising training sequence
Row execute self adaptation sequence estimation.
2. the channel estimation methods of single antenna interference cancellation technology are applied to as claimed in claim 1, and which is special
Levy and be, during direction determining being determined by signal energy, former burst is divided into from intermediate point each around
Length is half sequence of 78 symbols, calculates the average power content on both sides respectively, obtains the average work(of the right and left
Rate ratio, it is the less direction of mean power to select adaptive direction.
3. the channel estimation methods of single antenna interference cancellation technology are applied to as claimed in claim 2, and which is special
Levy and be, after the adaptive direction is selected, from the adaptive direction of differing from of the training sequence
Side proceeds by adaptive channel estimation, again from differing from the self adaptation side after the completion of adaptive channel estimation
To side proceed by iteration.
4. the channel estimation methods of single antenna interference cancellation technology are applied to as claimed in claim 2, and which is special
Levy and be, according to the size of half sequence average power ratio of both sides, a ratio range for belonging to intermediate zone is introduced,
Within the range, judge only to do the adaptive channel estimation of training sequence section.
5. the channel estimation methods of single antenna interference cancellation technology are applied to as claimed in claim 1, and which is special
Levy and be, before burst estimate is obtained, obtain the first time channel estimation value of signal；Described
In self adaptation sequence estimation, according to the step-length of the direction determining more new estimation, and with first secondary channel
Estimate is used as the initial value of self adaptation sequence estimation.
6. the channel estimation methods of single antenna interference cancellation technology are applied to as claimed in claim 5, and which is special
Levying and being, the first time channel estimation value of the signal is obtained using LS method of estimation.
7. the channel estimation methods of single antenna interference cancellation technology are applied to as claimed in claim 4, and which is special
Levy and be, when direction being judged as intermediate zone, only ART network is done to training sequence section, from training sequence
Section left side starts to do iteration until training sequence low order end.
8. the channel estimation methods of single antenna interference cancellation technology are applied to as claimed in claim 1, and which is special
Levy and be, when the self adaptation sequence estimation is executed, using LMS adaptive approach, select around test point
The gradient linearity mean value of each 2-3 point is used as the Grad of Chosen Point in front and back.
9. the channel estimation methods of single antenna interference cancellation technology are applied to as claimed in claim 1, and which is special
Levy and be, the method for the form that the burst estimate is reduced into burst is to add bit end to end, add
The training sequence at middle part, then carries out GMSK or 8PSK modulation according to the modulation format of desired signal.
10. a kind of channel estimating apparatus suitable for single antenna interference cancellation technology, it is characterised in that include：
The device of signal preequalization, for carrying out signal preequalization to obtain burst estimate；
For the sequence estimation value to be reduced into the device of a burst sequence form；
For calculate signal energy and determine adaptive direction judge device；And
For being carried out to half edge sequence comprising training sequence according to the reference value of burst sequence and adaptive direction
The device of self adaptation sequence estimation.
11. channel estimating apparatus for being applied to single antenna interference cancellation technology as claimed in claim 10,
Characterized in that, during determining that adaptive direction judges by signal energy, by former burst from intermediate point
It is divided into half sequence that each length around is 78 symbols, calculates the average power content on both sides respectively, obtains left and right two
The average power ratio on side, it is the less direction of mean power to select adaptive direction.
12. channel estimating apparatus for being applied to single antenna interference cancellation technology as claimed in claim 11,
Characterized in that, after the adaptive direction is selected, differing from the self adaptation side from the training sequence
To side proceed by adaptive channel estimation, described adaptive from differing from again after the completion of adaptive channel estimation
The side in direction is answered to proceed by iteration.
13. channel estimating apparatus for being applied to single antenna interference cancellation technology as claimed in claim 11,
Characterized in that, according to the size of half sequence average power ratio of both sides, introducing the ratio for belonging to intermediate zone
Scope, within the range, judges only to do the adaptive channel estimation of training sequence section.
14. channel estimating apparatus for being applied to single antenna interference cancellation technology as claimed in claim 10,
Characterized in that, before burst estimate is obtained, obtaining the first time channel estimation value of signal；?
In the self adaptation sequence estimation, according to the step-length of the direction determining more new estimation, and with the first time
Channel estimation value is used as the initial value of self adaptation sequence estimation.
15. channel estimating apparatus for being applied to single antenna interference cancellation technology as claimed in claim 14,
Characterized in that, obtaining the first time channel estimation value of the signal using LS method of estimation.
16. channel estimating apparatus for being applied to single antenna interference cancellation technology as claimed in claim 13,
Characterized in that, when direction is judged as intermediate zone, only doing ART network to training sequence section, from training
Start to do iteration until training sequence low order end on the left of tract.
17. channel estimating apparatus for being applied to single antenna interference cancellation technology as claimed in claim 10,
Characterized in that, when executing the self adaptation sequence estimation, using LMS adaptive approach, selecting test point
Before and after surrounding, the gradient linearity mean value of each 2-3 point is used as the Grad of Chosen Point.
18. channel estimating apparatus for being applied to single antenna interference cancellation technology as claimed in claim 10,
Characterized in that, the method that the burst estimate is reduced into burst sequence form is to add bit end to end,
Add the training sequence at middle part, then GMSK or 8PSK is carried out according to the modulation format of desired signal
Modulation.
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