CN105827550B - A kind of method and device determining target component using sliding window - Google Patents
A kind of method and device determining target component using sliding window Download PDFInfo
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Abstract
The invention discloses a kind of method and devices that target component is determined using sliding window, to reduce the operand during determining target component, the processing delay of reduction system and the system processing resources of occupancy, to reduce product cost, the complexity of system sequence design and the time delay of service surface are reduced.The method for determining target component using sliding window, comprising: when the midpoint of the sliding window is moved to the left side window of the signal window, the signal value of sampled point in the left side window is compared with preset threshold；The value of impact factor is determined according to comparison result.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of methods and dress that target component is determined using sliding window
It sets.
Background technique
In the product of mobile communication system is realized, channel estimation module is the key modules of physical layer Base-Band Processing,
Operand is also one of biggish module of operand in Base-Band Processing.Since there are multipaths for space channel, many channels are estimated at present
Calculating method requires to carry out time domain inhibition noise, and it is exactly by the way of sliding window that time domain, which inhibits the most common method of noise,.
Below with reference to Figure 1A -1D with channel estimation in long term evolution (Long Time Evolution, LTE) system be show
Example, time domain inhibits the implementation of noise to comprise the following steps in channel estimation at present:
Step 1: determining the position of signal window according to the result of the scene of application and part measurement, find out each in signal window
The quantity of sampled point is N in the range value or performance number Sig_p of a sampled point signal, a length of N of the window of signal namely signal window
It is a.
Step 2: determining the position of noise window, noise is determined according to the channel estimation value of sampled point each in noise window
Averaged amplitude value or average power content noise_p are VT=K according to the thresholding that noise power determines that signal retains diameterth×
Noise_p, KthFor regulation coefficient.
Step 3: determining the long 2L of window, a length of L of half-window of sliding window.
Step 4: the part being in signal window according to sliding window will entirely believe when sliding window moves in signal window
Number window is divided into three parts, as shown in Figure 1A, is respectively as follows: left side window, intermediate window and right-hand quater, it is assumed that the sampled point in signal window
Quantity is N, then 0~L-1 of left side sampled point is left side window, and L~N-L-1 sampled point is intermediate window, and N-L~N-1 is right-hand quater, under
Three, face point part describes to determine the process for retaining diameter:
As shown in Figure 1B, when the midpoint of sliding window moves to left window, using sliding window determine retain diameter when, need by
Whether a signal value Sig_p for judging the corresponding sampled point of all the points in sliding window is greater than threshold value VT, when all in sliding window
When putting the sampled point in corresponding sampled point there are at least one signal value Sig_p greater than threshold value VT, by sliding window midpoint pair
The channel path for the sampled point answered is as reservation diameter；When the signal value Sig_p of the corresponding sampled point of all the points in sliding window is small
When threshold value VT, the channel path of the corresponding sampled point in sliding window midpoint is not as reservation diameter.
Similarly, as shown in Figure 1 C, when the midpoint of sliding window is moved to intermediate window, and as shown in figure iD, when sliding window
Midpoint move to right window when, determined using sliding window when retaining diameter, need to judge one by one in sliding window that all the points are corresponding and adopt
Whether the signal value Sig_p of sampling point is greater than threshold value VT, when there are at least one in the corresponding sampled point of all the points in sliding window
When signal value Sig_p is greater than the sampled point of threshold value VT, using the channel path of the corresponding sampled point in sliding window midpoint as reservation
Diameter；When the signal value Sig_p of the corresponding sampled point of all the points in sliding window is respectively less than or is equal to threshold value VT, sliding window midpoint
The channel path of corresponding sampled point is not as reservation diameter.
From the above-mentioned determining process for retaining diameter can be seen that channel estimation in the prior art inhibit noise go bail for stay diameter when
It waits, whether each sampled point, which is to retain diameter at most to need to carry out 2L comparison operation, is determined for intermediate window, for left side window
And right-hand quater, it at most needs to carry out L+K1Secondary comparison operation (K1It is sampled point in the window of the left side with a distance from the window of the leftmost side, right-hand quater
Middle sampled point is with a distance from the window of the rightmost side), maximum number of comparisons maximum when can be 2NL-L2.In real-time processor,
This comparison operation can not line up flowing water, its next step arithmetic operation depends on the operation result of previous step, both make be
Powerful processor again, because will have many waitings without water operation, the time for completing the function will greatly greatly
It is long, thus will affect the runing time of channel estimation, and now many systems are all the stringent systems for having feedback,
It needs to complete certain things at the appointed time, this also can bring difficulty to the timing Design of system.
In conclusion being determined in the operation for retaining diameter in the prior art, operand is big, occupies more system resource, at
This is higher, and in service surface, there are biggish time delays, are unfavorable for the timing Design of system.
Summary of the invention
The embodiment of the invention provides a kind of method and devices that target component is determined using sliding window, to reduce determination
Operand during target component reduces the processing delay of system and the system processing resources of occupancy, to reduce product
Cost reduces the complexity of system sequence design and the time delay of service surface.
A kind of method determining target component using sliding window provided in an embodiment of the present invention, the sliding window is in signal window
Middle movement, this method comprises: when the midpoint of the sliding window is moved to the left side window of the signal window, it will be in the left side window
The signal value of sampled point is compared with preset threshold；The value of impact factor is determined according to comparison result.
In the above method provided in an embodiment of the present invention, pass through the signal value and preset threshold according to sampled point in the window of the left side
Relationship determine the value of impact factor so that during determining target component, need to only compare that sliding window midpoint is corresponding to adopt
The signal value of sampling point and the relationship of preset threshold are preset when the signal value of sampled point in the corresponding signal window in sliding window midpoint is greater than
When threshold value, the value of impact factor is updated, the corresponding sampled point of starting point of current sliding window can be judged according to the value of impact factor
Whether corresponding parameter is used as target component, with channel road corresponding to each sampled point in determining signal window in the prior art
When whether diameter as diameter is retained, need the signal value of the sampled point by sliding window Yu signal window lap one by one with preset threshold
Compare, compares completion greater than the sampled point of preset threshold or all sampled points of lap until finding out first signal value
Until compare, reduce the number of comparisons and operand during determining target component (such as: retaining diameter), reduce the place of system
The system processing resources of time delay and occupancy are managed, to reduce product cost, reduce the complexity and business of system sequence design
The time delay in face.
In a kind of possible embodiment, in the above method provided in an embodiment of the present invention, this method further include: work as institute
When stating the midpoint of sliding window and being moved to the intermediate window of the signal window, the target component of current sliding window is determined using such as
Lower step: obtaining the signal value of particular sample point, and the particular sample point is signal window corresponding to the midpoint of the sliding window
In sampled point；When the signal value for determining the particular sample point is greater than preset threshold, the value for updating the impact factor is
The number of sampled point corresponding to the sliding window, and using parameter corresponding to the first sampled point as target component, and will
The value of the impact factor subtracts one, wherein first sampled point is in signal window corresponding to the starting point of current sliding window
Sampled point.
In a kind of possible embodiment, in the above method provided in an embodiment of the present invention, this method further include: when true
When the signal value of the fixed particular sample point is less than or equal to preset threshold, described first is determined according to the value of the impact factor
Whether parameter corresponding to sampled point is used as target component, specifically includes:, will when the value for determining the impact factor is greater than zero
The corresponding parameter of first sampled point subtracts one as target component, and by the value of the impact factor；Alternatively, when determining institute
When stating the value of impact factor and being less than or equal to zero, the corresponding parameter of first sampled point is not as target component.
In a kind of possible embodiment, in the above method provided in an embodiment of the present invention, it will be adopted in the left side window
The signal value of sampling point is compared with preset threshold, and the value of impact factor is determined according to comparison result, comprising: in the left side window
Middle right-to-left obtains the signal value of the particular sample point；The signal value of the particular sample point is compared with preset threshold
Compared with when determining that first signal value is greater than the particular sample point of preset threshold, by the sliding window and signal window lap
Value of the corresponding number of sampling points as impact factor.
In the above method provided in an embodiment of the present invention, due in the window of the left side sampled point closer to intermediate window, the sampled point
The value of determining impact factor is bigger, therefore, when sampled point determines the value of impact factor in using left side window, in the window of the left side
Right-to-left obtains the signal value of particular sample point, need to only find the sampled point that first signal value is greater than preset threshold
The value for determining impact factor, it is not necessary that the signal value of sampled points all in the window of the left side to be compared with preset threshold, further
The number of comparisons reduced during determining target component and operand.
In a kind of possible embodiment, in the above method provided in an embodiment of the present invention, this method further include: work as institute
When stating the midpoint of sliding window and being moved to the right-hand quater of the signal window, increases after the right-hand quater and sampled comprising predetermined number
The right expanded window of point, and the signal value of all sampled points in the right expanded window is disposed as zero, wherein it is described default
Number is the half of number of sampling points corresponding to the sliding window.
In a kind of possible embodiment, in the above method provided in an embodiment of the present invention, the sampled point is corresponding
Parameter is channel estimation value, and the target component is the channel estimation value inhibited after noise.
A kind of device determining target component using sliding window provided in an embodiment of the present invention, the sliding window is in signal window
Middle movement, comprising: first processing units will when for being moved to the left side window of the signal window when the midpoint of the sliding window
The signal value of sampled point is compared with preset threshold in the left side window；The second processing unit is connected to first processing
Unit, for determining the value of impact factor according to comparison result.
In above-mentioned apparatus provided in an embodiment of the present invention, pass through the signal value and preset threshold according to sampled point in the window of the left side
Relationship determine the value of impact factor so that during determining target component, need to only compare that sliding window midpoint is corresponding to adopt
The signal value of sampling point and the relationship of preset threshold are preset when the signal value of sampled point in the corresponding signal window in sliding window midpoint is greater than
When threshold value, the value of impact factor is updated, the corresponding sampled point of starting point of current sliding window can be judged according to the value of impact factor
Whether corresponding parameter is used as target component, with channel road corresponding to each sampled point in determining signal window in the prior art
When whether diameter as diameter is retained, need the signal value of the sampled point by sliding window Yu signal window lap one by one with preset threshold
Compare, compares completion greater than the sampled point of preset threshold or all sampled points of lap until finding out first signal value
Until compare, reduce the number of comparisons and operand during determining target component (such as: retaining diameter), reduce the place of system
The system processing resources of time delay and occupancy are managed, to reduce product cost, reduce the complexity and business of system sequence design
The time delay in face.
In a kind of possible embodiment, in above-mentioned apparatus provided in an embodiment of the present invention, the device further include: obtain
Unit is connected to described the second processing unit, when for being moved to the intermediate window of the signal window when the midpoint of the sliding window,
The signal value of particular sample point is obtained, the particular sample point is the sampling in signal window corresponding to the midpoint of the sliding window
Point；Described the second processing unit is also used to when the signal value for determining the particular sample point is greater than preset threshold, described in update
The value of impact factor is the number of sampled point corresponding to the sliding window, and using parameter corresponding to the first sampled point as mesh
Parameter is marked, and the value of the impact factor is subtracted one, wherein first sampled point is corresponding to the starting point of current sliding window
Signal window in sampled point.
In a kind of possible embodiment, in above-mentioned apparatus provided in an embodiment of the present invention, described the second processing unit
It is also used to, when the signal value for determining the particular sample point is less than or equal to preset threshold, according to the value of the impact factor
It determines whether parameter corresponding to first sampled point is used as target component, specifically includes: when determining the impact factor
When value is greater than zero, the corresponding parameter of first sampled point is subtracted one as target component, and by the value of the impact factor；
Alternatively, the corresponding parameter of first sampled point is not as target when the value for determining the impact factor is less than or equal to 0
Parameter.
In a kind of possible embodiment, in above-mentioned apparatus provided in an embodiment of the present invention, the first processing units
The signal value of sampled point in the left side window is compared with preset threshold, described the second processing unit is true according to comparison result
Determine the value of impact factor, comprising: first processing units right-to-left in the left side window obtains the particular sample point
Signal value；The signal value of the particular sample point is compared by the first processing units with preset threshold, when determining
When one signal value is greater than the particular sample point of preset threshold, described the second processing unit is Chong Die with signal window by the sliding window
Value of the number of sampling points corresponding to part as impact factor.
In above-mentioned apparatus provided in an embodiment of the present invention, due in the window of the left side sampled point closer to intermediate window, the sampled point
The value of determining impact factor is bigger, therefore, when sampled point determines the value of impact factor in using left side window, in the window of the left side
Right-to-left obtains the signal value of particular sample point, need to only find the sampled point that first signal value is greater than preset threshold
The value for determining impact factor, it is not necessary that the signal value of sampled points all in the window of the left side to be compared with preset threshold, further
The number of comparisons reduced during determining target component and operand.
In a kind of possible embodiment, in above-mentioned apparatus provided in an embodiment of the present invention, described the second processing unit
It is also used to when the midpoint of the sliding window is moved to the right-hand quater of the signal window, increases after the right-hand quater comprising pre-
If the right expanded window of number sampled point, and the signal value of all sampled points in the right expanded window is disposed as zero,
In, the predetermined number is the half of number of sampling points corresponding to the sliding window.
In a kind of possible embodiment, in above-mentioned apparatus provided in an embodiment of the present invention, the sampled point is corresponding
Parameter is channel estimation value, and the target component is the channel estimation value inhibited after noise.
Detailed description of the invention
Figure 1A -1D is the schematic diagram that sliding window moves in signal window in the prior art；
Fig. 2 is a kind of flow diagram of method that reservation diameter is determined using sliding window provided in an embodiment of the present invention；
Fig. 3 is a kind of schematic illustration of method that reservation diameter is determined using sliding window provided in an embodiment of the present invention；
Fig. 4 be it is provided in an embodiment of the present invention in signal window increase on the right of expanded window schematic diagram；
Fig. 5 is a kind of structural schematic diagram of device that reservation diameter is determined using sliding window provided in an embodiment of the present invention；
Fig. 6 is the structural schematic diagram of another device that reservation diameter is determined using sliding window provided in an embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawing, to a kind of method and dress for determining target component using sliding window provided in an embodiment of the present invention
The specific embodiment set is described in detail.
The method provided in an embodiment of the present invention for determining target component using sliding window can be applied to any kind of cunning
The application scenarios of target component and its slightly modification are determined in dynamic window, it is unrelated with system type, such as: time domain presses down in channel estimation
Determine that utilizing sliding window to determine when retaining diameter, frequency domain inhibition noise retains diameter when noise processed using sliding window.Estimated below with channel
Time domain inhibits to be described in detail for determining reservation diameter when noise in meter.
In addition, it is necessary to explanation, sliding window provided in an embodiment of the present invention movement in signal window refers both to sliding window
Midpoint is moved in signal window, and signal window is divided into three parts: left side window, intermediate window and right-hand quater according to this, specific next
It says, when sliding window midpoint is in the 0th sampled point of signal window, only sampled point corresponding to half window segment of the right side of sliding window
In signal window, therefore, which is known as left side window；Similarly, when sliding window midpoint be in signal window last
When a sampled point, only sampled point corresponding to half window segment of a left side of sliding window is in signal window, therefore, by the part signal
Window is known as right-hand quater；When sliding window is moved in signal window except the part of left side window and right-hand quater, slide corresponding to window segment
Sampled point is in signal window, therefore, which is known as intermediate window.
A kind of method determining reservation diameter using sliding window provided in an embodiment of the present invention, the sliding window is in signal window
It is mobile, as shown in Fig. 2, this method comprises:
Step 202, when the midpoint of sliding window is moved to the left side window of signal window, by the signal value of sampled point in the window of the left side
It is compared with preset threshold；
Step 204, according to the value of comparison result impact factor.
In method provided in an embodiment of the present invention, by according to the signal value of sampled point and default in the window of the left side in the window of the left side
The relationship of threshold value determines the value of impact factor, so that it is corresponding only need to compare sliding window midpoint during determining reservation diameter
The signal value of sampled point and the relationship of preset threshold, when the signal value of sampled point in the corresponding signal window in sliding window midpoint is greater than in advance
If when threshold value, updating the value of impact factor, the corresponding sampling of starting point of current sliding window can be judged according to the value of impact factor
Whether the corresponding channel path of point is as diameter is retained, with letter corresponding to each sampled point in determining signal window in the prior art
When whether path as diameter is retained, need the signal value of the sampled point by sliding window Yu signal window lap one by one with preset
Threshold value comparison compares until finding out first signal value greater than the sampled point of preset threshold or all sampled points of lap
Compared until completion, reduce determine retain diameter during number of comparisons and operand, reduce system processing delay and
The system processing resources of occupancy reduce the complexity of system sequence design and the time delay of service surface to reduce product cost.
In a kind of possible embodiment, in the above method provided in an embodiment of the present invention, this method further include: work as cunning
When the midpoint of dynamic window is moved to the intermediate window of signal window, following steps are used for the determination of the reservation diameter of current sliding window: being obtained
The signal value of particular sample point is taken, particular sample point is the sampled point in signal window corresponding to the midpoint of sliding window；Work as determination
When the signal value of particular sample point is greater than preset threshold, the value for updating impact factor is of sampled point corresponding to sliding window
Number, and using channel path corresponding to the first sampled point as reservation diameter, and will affect the value of the factor and subtract one, wherein first
Sampled point is the sampled point in signal window corresponding to the starting point of current sliding window.
It should be noted that in method provided in an embodiment of the present invention, although being determined using the left side window of signal window is influenced
The initial value of the value of the factor, but when the midpoint of sliding window is moved to intermediate window, the position of the first sampled point is from left side window
First sampled point start namely the embodiment of the present invention using sliding window determine retain diameter during, utilize sliding
The signal value of sampled point corresponding to window midpoint updates the value of impact factor compared with preset threshold, true using the value of impact factor
Whether the channel path for determining the corresponding sampled point of sliding window starting point can determine in the left side window of signal window as diameter is retained
Whether the corresponding channel path of sampled point is as reservation diameter.
When it is implemented, the signal value of sampled point can be the range value or performance number of sampled point signal, original can be passed through
Beginning channel estimation sequence is calculated, and preset threshold can be set according to the averaged amplitude value or average power content of noise, example
Such as: preset threshold VT=Kth× noise_p, wherein noise_p is the average amplitude or mean power of noise, KthFor adjustment
Coefficient can specifically set according to specific model of place, or take default value, such as: Kth=4.Certainly, preset threshold should be with
Signal value is corresponding, and specifically, if the signal value of sampled point is range value, preset threshold be should also be as range value；If adopting
The signal value of sampling point is performance number, then preset threshold should also be as performance number.
Firstly, determining that the principle for retaining diameter is illustrated using sliding window to provided in an embodiment of the present invention in conjunction with Fig. 3, such as
Shown in Fig. 3, when sliding window slides in signal window, sliding window moves a sampled point every time, such as: for sliding window A0、A1…
A2L, wherein L is that the half-window of sliding window is long, sliding window A0With sliding window A1Between there is 2L-1 sampled point to be duplicate, sliding window
A0With sliding window A2Between have 2L-2 sampled point be it is duplicate, therefore, determining sliding window A0Sampled point corresponding to interior midpoint
Channel path whether retain during, by signal window A0The signal value of sampled point corresponding to interior all the points with default threshold
Value compares, then for determining sliding window A1When whether the channel path of the corresponding sampled point in midpoint retains, there is no need to
By sliding window A1The signal value of sampled point corresponding to interior all the points is compared with preset threshold, can use sliding window A0
The left over by history information of interior comparison is only needed at this time by sliding window A1Inside not with sliding window A0The signal value of duplicate sampled point with
Preset threshold is compared.
Based in sliding window moving process, each movement for sliding window only increases a sampled point newly in sliding window,
It is determined using sliding window during retaining diameter, introduce the value of impact factor, the value of impact factor is used to record full in the window of the left side
The coverage of the point of sufficient condition (signal value is greater than preset threshold), that is, first with left side window calculate initialization influence because
The value of son, sliding window is in the moving process of signal window, according to the signal value and preset threshold for increasing sampled point in sliding window newly
Relationship updates the value of impact factor, and some sampled point (example in sliding window is determined according to the value of the impact factor before update
Such as sampled point corresponding to sliding window starting point) channel path whether retain, can be using increasing expanded window for right-hand quater
It is handled.
It is provided in an embodiment of the present invention that the specific steps for retaining the method for diameter are determined using sliding window, comprising:
Step 1: determining the position of signal window according to the result of the scene of application and part measurement, find out each in signal window
The quantity of sampled point is N in the range value or performance number Sig_p of a sampled point signal, a length of N of the window of signal namely signal window
A, original time domain channel estimation sequence is h (n), n ∈ (0,1 ... N-1).
Step 2: determining the position of noise window, noise is determined according to the channel estimation value of sampled point each in noise window
Averaged amplitude value or performance number noise_p are VT=K according to the preset threshold that noise power determines that signal retains diameterth×
Noise_p, KthFor regulation coefficient.
Step 3: determining the long 2L of window, a length of L of half-window of sliding window.
Step 4: inhibiting the channel estimation sequence after noise is hremove_noise(n), first the time domain after noise will be inhibited to believe
Channel estimation sequence sets 0, hremove_noise(n)=0, n ∈ (0,1 ... N-1).
Firstly, when the midpoint of sliding window moves to left window, by the signal of all sampled points in the left side window of signal window
Value Sig_p is compared with preset threshold VT, is found out first signal value Sig_p of right-to-left in the window of the left side and is greater than preset threshold
Then the sampled point of VT determines the value of impact factor according to the sampled point.Namely the value of the impact factor is according in the window of the left side
First signal value of right-to-left, which is greater than, retains diameter number determined by the sampled point of preset threshold.
As more preferred embodiment, the signal value of sampled point in the window of the left side is compared with preset threshold, according to
Comparison result determines the value of impact factor, comprising: right-to-left obtains the signal value of particular sample point in the window of the left side；It will be specific
The signal value of sampled point is compared with preset threshold, when determine first signal value be greater than preset threshold particular sample point
When, using number of sampling points corresponding to sliding window and signal window lap as the value of impact factor.
As more specific embodiment, it is assumed that the value of impact factor is indicated with C, is believed for right-to-left first in the window of the left side
It is sampled point at L-X that number value, which is greater than the sampled point of preset threshold, then due in sliding window in the corresponding sampled point of all the points
When being greater than preset threshold there are the signal value of a sampled point, the channel path of sampled point corresponding to current sliding window midpoint is
It can be used as reservation diameter, therefore, for the sampled point, which is for the biggest impact range of its right side sampled point
When the midpoint of sliding window is moved to the sampled point, sampled point 2L-X corresponding to sliding window right side boundary point, in other words, when
When the midpoint of sliding window is moved to 2L-X, sampled point corresponding to first point is the sampled point at L-X in sliding window, due to this
The signal value of sampled point at L-X is greater than preset threshold, then the channel path of sampled point can be as reservation diameter at 2L-X.Cause
This, when indicating the position of sampled point with ii namely when ii=L-X, C=2L- (L-ii)=L+ii=2L-X.
At this point, the value of impact factor indicates that the signal value of the rightmost side first is greater than the sampled point energy of preset threshold in the window of the left side
The position for determining the rightmost sampled point for retaining diameter is influenced, for left side window, the more sampled point on the right, influence factor is got over
Greatly namely the value of its impact factor determined is bigger, and when it meets condition, the channel path of the sampled point on the left side is as guarantor
Diameter is stayed, when sampled point determines the value of impact factor in using left side window, right-to-left obtains particular sample point in the window of the left side
Signal value, only need to find first signal value be greater than preset threshold sampled point, that is, can determine the value of impact factor, without will
The signal value of all sampled points is compared with preset threshold in the window of the left side, is further reduced during determining reservation diameter
Number of comparisons and operand.
When the midpoint of sliding window is moved to intermediate window, particular sample point (signal window corresponding to sliding window midpoint is obtained
In sampled point) signal value, as long as the signal value of particular sample point be greater than preset threshold, since sliding window is moved in intermediate window
When dynamic, the lap of sliding window and signal window is that the window of entire sliding window is long, and therefore, the value of impact factor is updated to sliding window
Long 2L.When the value for determining impact factor is greater than zero, it is using the channel path of the first sampled point as diameter, the first sampled point is retained
Sampled point in signal window corresponding to sliding window starting point, and the value of impact factor subtracts one, then sliding window moves right one
Sampled point, whether the channel path for continuing to determine next sampled point is as reservation diameter.
When the signal value for determining particular sample point is less than or equal to preset threshold, first is determined according to the value of impact factor
Whether channel path corresponding to sampled point specifically includes as diameter is retained: when the value for determining impact factor is greater than zero, by the
The corresponding channel path of one sampled point is as retaining diameter, and will affect the value of the factor and subtract one；Alternatively, when determining impact factor
When value is less than or equal to zero, the corresponding channel path of the first sampled point is not as reservation diameter.
Specifically, when the value of impact factor is greater than zero, show exist extremely in sampled point corresponding to current sliding window
Few one meets the sampled point that signal value is greater than preset threshold, and therefore, the channel path of the first sampled point can be as reservation diameter；
When the value of impact factor is less than zero, show that there is no meet signal value greater than default in sampled point corresponding to current sliding window
The sampled point of threshold value, therefore, the channel path of the first sampled point cannot function as retaining diameter.
When the midpoint of sliding window moves to right window, increase the right comprising predetermined number sampled point after window on the right
Expanded window, and the signal value of sampled points all in the expanded window of the right is disposed as zero, wherein predetermined number is right for sliding window
The half for the number of sampling points answered.
Due to when it is implemented, being adopted corresponding to the midpoint of sliding window in determining right-hand quater when the reservation diameter of sampled point
Sampling point is not in signal window, by increasing the right expanded window after window on the right, as shown in figure 4, by signal in the expanded window of the right
Value is set to 0, since the signal value of sampled point in the expanded window of the right is 0, sampled point can not update in the expanded window of the right
The value of impact factor, therefore, the right expanded window of this and sliding window there is no be it is identical, facilitate in determining right-hand quater
Whether channel path corresponding to sampled point is as reservation diameter.
Using channel path corresponding to the first sampled point as reservation diameter, comprising: by the channel estimation value of the first sampled point
Channel estimation value after inhibiting noise as the sampled point, is also assigned channel path as the value of the h (n) for the sampled point for retaining diameter
It is worth to hremove_noise(n)。
Determine that the detailed process for the method for retaining diameter can be seen that this hair using sliding window from provided in an embodiment of the present invention
Bright embodiment is determining that first part utilizes the signal value of sampled point in the window of the left side and pre- during retaining diameter using sliding window
If the comparison result of threshold value determines the value of impact factor and at most needs L comparison operation, second part is according to the value of impact factor
Determine that the update for the value for retaining diameter and impact factor needs 2N comparison operation, then the comparison operation needed in whole process time
Number is 2N+L comparison operation, and at most needs 2NL-L in the prior art2Secondary comparison operation, wherein N is the length of signal window,
Half-window length of the L for sliding window, N > L, L >=1 are compared with prior art, provided in an embodiment of the present invention to be determined using sliding window
The process that reservation diameter is determined in sliding window is optimized in the method for retaining diameter, the implementation method and existing way after optimization
Equivalent without any performance loss, but really greatly reduced the runing time of the process, to greatly reduce
The operand of the module in product, accelerates the runing time of the module, so as to reduce the cost and system design of product
Complexity.
Either which kind of application scenarios, it is provided in an embodiment of the present invention to determine that the method for retaining diameter is relatively existing using sliding window
There is the operand of technology all to be reduced.N is different from the proportionate relationship of L in different application scene, and the value of L is also different, this hair
What bright embodiment provided determined using sliding window retains the operand of the method for diameter compared with the prior art and reduces degree also phase not to the utmost
Together, by taking the wide channel estimation of the filled band in LTE as an example, N 1200, L 10 is provided in an embodiment of the present invention at this time to utilize sliding
Window determines that the operand K-theoretic operation K amount for the method for retaining diameter substantially only has the 1/10 of the prior art.Processing for flowing water type
Device, such as: Digital Signal Processing (Digital Signal Processor, DSP), multiprocessor computer (PowerPC,
PPC) etc., it is provided in an embodiment of the present invention to determine that the method for retaining diameter has very big mention in arithmetic speed using sliding window
It rises, it is provided in an embodiment of the present invention to determine that the method for retaining diameter exists using sliding window by taking channel estimation time domain inhibits noise as an example
It is averagely only the 1/3 of the prior art in runing time.
A kind of device determining reservation diameter using sliding window provided in an embodiment of the present invention, the sliding window is in signal window
It is mobile, as shown in Figure 5, comprising: first processing units 502 are moved to the signal window for the midpoint when the sliding window
When the window of the left side, the signal value of sampled point in the left side window is compared with preset threshold；The second processing unit 504, connection
To first processing units 502, for determining the value of impact factor according to comparison result.
In device provided in an embodiment of the present invention, pass through the pass according to the signal value of sampled point and preset threshold in the window of the left side
It is the value for determining impact factor, so that need to only compare the corresponding sampled point in sliding window midpoint during determining reservation diameter
The relationship of signal value and preset threshold, when the signal value of sampled point in the corresponding signal window in sliding window midpoint is greater than preset threshold
When, the value of impact factor is updated, can judge that the corresponding sampled point institute of the starting point of current sliding window is right according to the value of impact factor
Whether the channel path answered is as diameter is retained, with channel path corresponding to each sampled point in determining signal window in the prior art
When whether as retaining diameter, need the signal value of the sampled point by sliding window Yu signal window lap one by one with preset threshold ratio
Compared with all sampled points until finding out sampled point or lap that first signal value is greater than preset threshold compare completion and are
It only compares, reduces the number of comparisons and operand determined during retaining diameter, reduce the processing delay and occupancy of system
System processing resources reduce the complexity of system sequence design and the time delay of service surface to reduce product cost.
In a kind of possible embodiment, in device provided in an embodiment of the present invention, the device further include: acquiring unit
506, it being connected to the second processing unit 504, when for being moved to the intermediate window of the signal window when the midpoint of the sliding window, being obtained
The signal value of particular sample point is taken, the particular sample point is the sampling in signal window corresponding to the midpoint of the sliding window
Point；The second processing unit 504 is also used to update the shadow when the signal value for determining the particular sample point is greater than preset threshold
Ring the factor value be the sliding window corresponding to sampled point number, and using channel path corresponding to the first sampled point as
Retain diameter, and the value of the impact factor is subtracted one, wherein first sampled point is corresponding to the starting point of current sliding window
Signal window in sampled point.
In a kind of possible embodiment, in device provided in an embodiment of the present invention, the second processing unit 504 is also used
In determining according to the value of the impact factor when the signal value for determining the particular sample point is less than or equal to preset threshold
Whether parameter corresponding to first sampled point is used as target component, specifically includes: when the value for determining the impact factor is big
When zero, the corresponding parameter of first sampled point is subtracted one as target component, and by the value of the impact factor；Or
Person, when the value for determining the impact factor is less than or equal to zero, the corresponding parameter of first sampled point is joined not as target
Number.
In a kind of possible embodiment, in device provided in an embodiment of the present invention, first processing units 502 will be described
The signal value of sampled point is compared with preset threshold in the window of the left side, and the second processing unit 504 is determined according to comparison result to be influenced
The value of the factor, comprising: the right-to-left in the left side window of first processing units 502 obtains the signal of the particular sample point
Value；The signal value of the particular sample point is compared by first processing units 502 with preset threshold, when determining described specific adopt
When the signal value of sampling point is greater than preset threshold, the second processing unit 504 will be corresponding to the sliding window and signal window lap
Value of the number of sampling points as impact factor.
In device provided in an embodiment of the present invention, since for sampled point closer to intermediate window, the sampled point is determining in the window of the left side
Impact factor value it is bigger, therefore, when sampled point determines the value of impact factor in using left side window, from right in the window of the left side
The signal value for obtaining particular sample point to the left need to only find the sampled point that first signal value is greater than preset threshold, that is, can determine
The value of impact factor further subtracts it is not necessary that the signal value of sampled points all in the window of the left side to be compared with preset threshold
The small determining number of comparisons retained during diameter and operand.
In a kind of possible embodiment, in device provided in an embodiment of the present invention, the second processing unit 504 is also used
In determining according to the value of the impact factor when the signal value for determining the particular sample point is less than or equal to preset threshold
Whether channel path corresponding to first sampled point specifically includes: as diameter is retained when the value for determining the impact factor
When greater than zero, using the corresponding channel path of first sampled point as retaining diameter, and the value of the impact factor subtracted one；
Alternatively, when the value for determining the impact factor is less than or equal to zero, the corresponding channel path of first sampled point not as
Retain diameter.
In a kind of possible embodiment, in device provided in an embodiment of the present invention, the second processing unit 504 is also used to
When the midpoint of the sliding window is moved to the right-hand quater of the signal window, increasing after the right-hand quater includes predetermined number
The right expanded window of sampled point, and the signal value of all sampled points in the right expanded window is disposed as zero, wherein it is described
Predetermined number is the half of number of sampling points corresponding to the sliding window.
In a kind of possible embodiment, in device provided in an embodiment of the present invention, the second processing unit 504 will be described
Channel path corresponding to first sampled point is as retaining diameter, comprising: the second processing unit 504 is by the letter of first sampled point
Road estimated value inhibits the channel estimation value after noise as the sampled point.
It is determined in the device for retaining diameter provided in an embodiment of the present invention using sliding window, first processing units 502 can be with
Using processors such as CPU, the second processing unit 504 can also be using processors such as CPU, certainly, first processing units 502 and the
Two processing units 504 can also can use signal detector etc. using the processors such as same CPU, acquiring unit 506.
Another embodiment of the present invention provides using sliding window determine retain diameter device, as shown in Figure 6, comprising: processing
Device 600, transceiver 610 and memory 620, specifically:
Processor 600 executes following process for reading the program in memory 620:
When the sliding window is moved to the left side window of the signal window, by the signal value of sampled point in the left side window with
Preset threshold is compared, and determines the value of impact factor according to comparison result, the value of the impact factor be in the left side window from
Left first signal value of dextrad, which is greater than, retains diameter number determined by the sampled point of preset threshold；
The signal value of particular sample point is obtained by transceiver 610, the particular sample point is the midpoint of the sliding window
Sampled point in corresponding signal window；
When the signal value for determining the particular sample point is greater than preset threshold, it is described for updating the value of the impact factor
The number of sampled point corresponding to sliding window, and using channel path corresponding to the first sampled point as retaining diameter, and by institute
The value for stating impact factor subtracts one, wherein first sampled point is adopting in signal window corresponding to the starting point of the sliding window
Sampling point；
When the signal value for determining the particular sample point is less than or equal to preset threshold, according to the value of the impact factor
Determine that channel path corresponding to first sampled point whether as diameter is retained, specifically includes: when determining the impact factor
Value when being greater than zero, will the corresponding channel path of first sampled point as reservation diameter, and by the value of the impact factor
Subtract one；Alternatively, the corresponding channel path of first sampled point is not when the value for determining the impact factor is less than or equal to 0
As reservation diameter；
When the sliding window is moved to the right-hand quater of the signal window, increase after the right-hand quater comprising default
The right expanded window of number sampled point, and the signal value of all sampled points in the right expanded window is disposed as zero, wherein institute
State the half that predetermined number is number of sampling points corresponding to the sliding window.
Transceiver 610, for sending and receiving data under the control of processor 600.
Wherein, in Fig. 6, bus architecture may include the bus and bridge of any number of interconnection, specifically by processor 600
The various circuits for the memory that the one or more processors and memory 620 of representative represent link together.Bus architecture is also
Various other circuits of such as peripheral equipment, voltage-stablizer and management circuit or the like can be linked together, these are all
It is it is known in the art, therefore, it will not be further described herein.Bus interface provides interface.Transceiver 610 can
To be multiple element, that is, includes transmitter and transceiver, the list for communicating over a transmission medium with various other devices is provided
Member.Processor 600, which is responsible for management bus architecture and common processing, memory 620, can store processor 600 and is executing operation
When used data.
In conclusion a kind of method and device for being determined target component using sliding window provided in an embodiment of the present invention, is led to
It crosses and shadow is determined greater than the sampled point of preset threshold and the relationship of preset threshold according to first signal value of right-to-left in the window of the left side
The value of the factor is rung, so that need to only compare the signal value of the corresponding sampled point in sliding window midpoint during determining target component
It is updated with the relationship of preset threshold when the signal value of sampled point in the corresponding signal window in sliding window midpoint is greater than preset threshold
The value of impact factor can judge parameter corresponding to the corresponding sampled point of starting point of current sliding window according to the value of impact factor
Whether it is used as target component, reduces number of comparisons and operand during determining target component (such as: retaining diameter), reduce
The processing delay of system and the system processing resources of occupancy reduce the complexity of system sequence design to reduce product cost
The time delay of degree and service surface.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The shape for the computer program product implemented in usable storage medium (including but not limited to magnetic disk storage and optical memory etc.)
Formula.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of method for determining target component using sliding window, the sliding window move in signal window, which is characterized in that should
Method includes:
When the midpoint of the sliding window is moved to the left side window of the signal window, by the signal value of sampled point in the left side window
It is compared with preset threshold；
The value of impact factor is determined according to comparison result；
Wherein, the signal value of sampled point in the left side window is compared with preset threshold, being determined according to comparison result influences
The value of the factor, comprising:
Right-to-left obtains the signal value of particular sample point in the left side window；
The signal value of the particular sample point is compared with preset threshold, when determine first signal value be greater than preset threshold
Particular sample point when, using number of sampling points corresponding to the sliding window and signal window lap as impact factor
Value.
2. the method according to claim 1, wherein this method further include:
When the midpoint of the sliding window is moved to the intermediate window of the signal window, for current sliding window target component really
Surely following steps are used:
The signal value of particular sample point is obtained, the particular sample point is in signal window corresponding to the midpoint of the sliding window
Sampled point；
When the signal value for determining the particular sample point is greater than preset threshold, the value for updating the impact factor is the sliding
The number of sampled point corresponding to window, and using parameter corresponding to the first sampled point as target component, and by the influence
The value of the factor subtracts one, wherein first sampled point is the sampled point in signal window corresponding to the starting point of current sliding window.
3. according to the method described in claim 2, it is characterized in that, this method further include:
When the signal value for determining the particular sample point is less than or equal to preset threshold, determined according to the value of the impact factor
Whether parameter corresponding to first sampled point is used as target component, specifically includes:
When the value for determining the impact factor is greater than zero, using the corresponding parameter of first sampled point as target component, with
And the value of the impact factor is subtracted one；Alternatively,
When the value for determining the impact factor is less than or equal to zero, the corresponding parameter of first sampled point is joined not as target
Number.
4. the method according to claim 1, wherein this method further include:
When the midpoint of the sliding window is moved to the right-hand quater of the signal window, increase after the right-hand quater comprising default
The right expanded window of number sampled point, and the signal value of all sampled points in the right expanded window is disposed as zero, wherein
The predetermined number is the half of number of sampling points corresponding to the sliding window.
5. method according to any of claims 1-4, which is characterized in that the corresponding parameter of the sampled point is channel
Estimated value, the target component are the channel estimation value inhibited after noise.
6. a kind of device for being determined target component using sliding window, the sliding window are moved in signal window, which is characterized in that packet
It includes:
First processing units, when for being moved to the left side window of the signal window when the midpoint of the sliding window, by the left side
The signal value of sampled point is compared with preset threshold in window；
The second processing unit is connected to the first processing units, for determining the value of impact factor according to comparison result；
Wherein, the signal value of sampled point in the left side window is compared by the first processing units with preset threshold, described
The second processing unit determines the value of impact factor according to comparison result, comprising:
First processing units right-to-left in the left side window obtains the signal value of particular sample point；
The signal value of the particular sample point is compared by the first processing units with preset threshold, when determining first letter
When number value is greater than the particular sample point of preset threshold, described the second processing unit is by the sliding window and signal window lap institute
Value of the corresponding number of sampling points as impact factor.
7. device according to claim 6, which is characterized in that the device further include:
Acquiring unit is connected to described the second processing unit, is moved to the signal window for the midpoint when the sliding window
When intermediate window, the signal value of particular sample point is obtained, the particular sample point is signal corresponding to the midpoint of the sliding window
Sampled point in window；
Described the second processing unit is also used to when the signal value for determining the particular sample point is greater than preset threshold, described in update
The value of impact factor is the number of sampled point corresponding to the sliding window, and using parameter corresponding to the first sampled point as mesh
Parameter is marked, and the value of the impact factor is subtracted one, wherein first sampled point is corresponding to the starting point of current sliding window
Signal window in sampled point.
8. device according to claim 7, which is characterized in that described the second processing unit is also used to, when determining the spy
When determining the signal value of sampled point less than or equal to preset threshold, the first sampled point institute is determined according to the value of the impact factor
Whether corresponding parameter is used as target component, specifically includes:
When the value for determining the impact factor is greater than zero, using the corresponding parameter of first sampled point as target component, with
And the value of the impact factor is subtracted one；Alternatively,
When the value for determining the impact factor is less than or equal to zero, the corresponding parameter of first sampled point is joined not as target
Number.
9. device according to claim 6, which is characterized in that described the second processing unit is also used to when the sliding window
When midpoint is moved to the right-hand quater of the signal window, increases the right comprising predetermined number sampled point after the right-hand quater and expand
Window is opened up, and the signal value of all sampled points in the right expanded window is disposed as zero, wherein the predetermined number is described
The half of number of sampling points corresponding to sliding window.
10. the device according to any one of claim 6-9, which is characterized in that the corresponding parameter of the sampled point is letter
Road estimated value, the target component are the channel estimation value inhibited after noise.
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| CN103095624A (en) * | 2011-10-27 | 2013-05-08 | 国民技术股份有限公司 | Frame synchronization method |
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