CN101888355A - Adaptive filter and filtering method - Google Patents
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- CN101888355A CN101888355A CN2010101576284A CN201010157628A CN101888355A CN 101888355 A CN101888355 A CN 101888355A CN 2010101576284 A CN2010101576284 A CN 2010101576284A CN 201010157628 A CN201010157628 A CN 201010157628A CN 101888355 A CN101888355 A CN 101888355A
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Abstract
The invention is suitable for the technical field of communication, and provides an adaptive filter and a filtering method. The adaptive filter comprises a filtering module and a tap coefficient updating module, wherein the filtering module performs time-delay decomposition on an input signal u(n) of a forwarding antenna and generates an error output signal e(n); the tap coefficient updating module acquires a tap coefficient of the next moment according to the error output signal e(n) and adjusts and updates the tap weight of the filter according to the tap coefficient; and a first coefficient updating algorithm control module and a second coefficient updating algorithm control module of the tap coefficient updating module switch operation to solve the problems that when the tap coefficient of the filter is updated, the complicated complex multiplication operation consumes a large amount of hardware resources and the hardware delay is over-long, and simultaneously, the first coefficient updating algorithm control module and the second coefficient updating algorithm control module of the tap coefficient updating module effectively combine the advantages of a 1ms algorithm and an n1ms algorithm to improve the working efficiency and the stability of the adaptive filter.
Description
Technical field
The invention belongs to communication technical field, relate in particular to a kind of sef-adapting filter and filtering method.
Background technology
Existing self adaptation tap coefficient update method is based on the power that calculates input signal u (n) || u (n) ||
2, because this power || u (n) ||
2Limited size in the exponent number of sef-adapting filter, make || u (n) ||
2In actual application, can not very accurately embody actual signal power and change, and the resource that is consumed in the tap coefficient renewal process to be excessive, the hardware time-delay is long.
And because existing minimum mean square lms algorithm and nlms algorithm have pluses and minuses separately, the advantage of lms is exactly that algorithm the convergence speed is fast, and it is not high enough that shortcoming is exactly lms output valve precision; And the advantage of nlms is exactly an output valve precision height, and that shortcoming is exactly a convergence rate is slow.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of sef-adapting filter, be intended to solve the variation that existing self adaptation tap coefficient update method can not embody the power of actual signal accurately, the resource that is consumed in the tap coefficient renewal process is excessive, the hardware time-delay is long, and existing lms algorithm and nlms algorithm have separately pluses and minuses, the operating efficiency of filter and the problem of less stable.
The embodiment of the invention is achieved in that a kind of sef-adapting filter, and described sef-adapting filter comprises filtration module and tap coefficient update module, wherein:
Filtration module is used for input signal u (n) to forwarding antenna delay time decomposition and generated error output signal e (n); And
The tap coefficient update module is used for according to described error output signal e (n), obtains next tap coefficient constantly
, and upgrade the tap-weights of filter with described tap coefficient adjustment;
Described tap coefficient update module specifically comprises:
The first coefficient update algorithm controls module is used for input signal u (n) is taken advantage of again with the error output signal e (n) that described filtration module generates, and calculates first median e* (n) the * u (n);
The second coefficient update algorithm controls module is used for input signal u (n) is taken advantage of again with the error output signal e (n) that described filtration module generates, and obtains first median e* (n) the * u (n), and calculates the power of described output signal e (n) || e (n) ||
2, calculate second median e* (n) * u (n) the * lms_step;
Algorithm switching controls module, be used for the work state information of the described first coefficient update algorithm controls module is monitored, when monitoring described work state information when satisfying the threshold condition set in advance, control finishes the operation of the described first coefficient update algorithm controls module, start the described second coefficient update algorithm controls module and carry out corresponding coefficient updating operation, wherein, when described sef-adapting filter startup work, the described first coefficient update algorithm controls module is carried out coefficient updating operation; And
Coefficient updating module is used for second median e* (n) * u (n) the * lms_step that first median e* (n) the * u (n) that the described first coefficient update algorithm controls module calculates or the described second coefficient update algorithm controls module calculate and the tap coefficient of previous moment
Do add operation, obtain next tap coefficient constantly
Another purpose of the embodiment of the invention is to provide a kind of filtering method of sef-adapting filter, and described method comprises the steps:
Filtration module is to the input signal u (n) of forwarding antenna delay time decomposition and generated error output signal e (n); And
The tap coefficient update module is obtained next tap coefficient constantly according to described error output signal e (n)
And upgrade the tap-weights of filter with described tap coefficient adjustment;
Described tap coefficient update module is obtained next tap coefficient constantly according to described error output signal e (n)
And specifically comprise with the step that the tap-weights of filter is upgraded in described tap coefficient adjustment:
The first coefficient update algorithm controls module is taken advantage of input signal u (n) again with the error output signal e (n) that described filtration module generates, and calculates first median e* (n) the * u (n);
The second coefficient update algorithm controls module is taken advantage of input signal u (n) again with the error output signal e (n) that described filtration module generates, and obtains first median e* (n) the * u (n), and calculates the power of described output signal e (n) || e (n) ||
2, calculate second median e* (n) * u (n) the * lms_step;
Algorithm switching controls module is monitored the work state information of the described first coefficient update algorithm controls module, when monitoring described work state information when satisfying the threshold condition set in advance, control finishes the operation of the described first coefficient update algorithm controls module, start the described second coefficient update algorithm controls module and carry out corresponding coefficient updating operation, wherein, when described sef-adapting filter startup work, the described first coefficient update algorithm controls module is carried out coefficient updating operation;
Second median e* (n) * u (n) the * lms_step that first median e* (n) * u (n) that the described first coefficient update algorithm controls module of coefficient updating module calculates or the described second coefficient update algorithm controls module calculate and the tap coefficient of previous moment
Do add operation, obtain next tap coefficient constantly
In embodiments of the present invention, sef-adapting filter comprises filtration module and tap coefficient update module, wherein, when sef-adapting filter startup work, the first coefficient update algorithm controls module of tap coefficient update module is taken advantage of input signal u (n) again with the error output signal e (n) that described filtration module generates, calculate first median e* (n) the * u (n), coefficient updating module is with the tap coefficient of described first median e* (n) the * u (n) with previous moment
Do add operation, obtain next tap coefficient constantly
When algorithm switching controls module monitors when the work state information of the described first coefficient update algorithm controls module satisfies the threshold condition that sets in advance, control finishes the operation of the described first coefficient update algorithm controls module, start the described second coefficient update algorithm controls module and carry out corresponding coefficient updating operation, the described second coefficient update algorithm controls module is taken advantage of input signal u (n) again with the error output signal e (n) that described filtration module generates, obtain first median e* (n) the * u (n), and calculate the power of described output signal e (n) || e (n) ||
2, calculating second median e* (n) * u (n) the * lms_step, coefficient updating module is with the tap coefficient of described second median e* (n) * u (n) * lms_step and previous moment
Do add operation, obtain next tap coefficient constantly
When having solved the filter tap coefficients renewal, the great amount of hardware resources that the complex multiplication operation of complexity is consumed, the problem that the hardware time-delay is long, effective simultaneously advantage, the operating efficiency and the stability of raising sef-adapting filter in conjunction with lms algorithm and nlms algorithm.
Description of drawings
Fig. 1 is the structured flowchart of the sef-adapting filter that provides of the embodiment of the invention;
Fig. 2 is the structured flowchart of the second coefficient update algorithm controls module that provides of the embodiment of the invention;
Fig. 3 is the structured flowchart of the filtration module that provides of the embodiment of the invention;
Fig. 4 is the realization flow figure of the filtering method of the sef-adapting filter that provides of the embodiment of the invention;
Fig. 5 be the tap coefficient update module that provides of the embodiment of the invention according to described error output signal e (n), obtain next tap coefficient constantly
And upgrade the realization flow figure of the tap-weights of filter with described tap coefficient adjustment;
Fig. 6 is the specific implementation flow chart that the second coefficient update algorithm controls module that the embodiment of the invention provides calculates the step of second median e* (n) * u (n) the * lms_step;
Fig. 7 is the filtration module that provides of the embodiment of the invention to the input signal u (n) of forwarding antenna the delay time decomposition and the realization flow figure of generated error output signal e (n).
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 1 shows the structured flowchart of the sef-adapting filter that the embodiment of the invention provides, for convenience of explanation, only provided the part relevant among the figure, wherein with the embodiment of the invention, this sef-adapting filter can be built in repeater or other device, at this not in order to restriction the present invention.
Sef-adapting filter comprises filtration module 11 and tap coefficient update module 12, wherein:
The input signal u (n) of 11 pairs of forwarding antennas of filtration module delay time decomposition and generated error output signal e (n); Tap coefficient update module 12 is obtained next tap coefficient constantly according to the error output signal e (n) that described filtration module 11 generates
And upgrade the tap-weights of filter with described tap coefficient adjustment.
In embodiments of the present invention, the first coefficient update algorithm controls module 121 is taken advantage of input signal u (n) again with the error output signal e (n) that described filtration module generates, and calculates first median e* (n) the * u (n); The second coefficient update algorithm controls module 122 is taken advantage of input signal u (n) again with the error output signal e (n) that described filtration module 11 generates, and obtains first median e* (n) the * u (n), and calculates the power of described output signal e (n) || e (n) ||
2, calculate second median e* (n) * u (n) the * lms_step; The work state information of 123 pairs of described first coefficient update algorithm controls modules 121 of algorithm switching controls module is monitored, when monitoring described work state information when satisfying the threshold condition set in advance, control finishes the operation of the described first coefficient update algorithm controls module 121, start the described second coefficient update algorithm controls module 122 and carry out corresponding coefficient updating operation, wherein, when described sef-adapting filter startup work, the described first coefficient update algorithm controls module 121 is carried out coefficient updating operations; Second median e* (n) * u (n) the * lms_step that first median e* (n) * u (n) that the coefficient updating module 124 described first coefficient update algorithm controls modules 121 calculate or the described second coefficient update algorithm controls module 122 calculate and the tap coefficient of previous moment
Do add operation, obtain next tap coefficient constantly
In the above-described embodiments, the above-mentioned first coefficient update algorithm controls module, 121 pairing algorithms can be the lms algorithms, the second coefficient update algorithm controls module, 122 pairing algorithms can be the nlms algorithms, can certainly be other algorithms, at this as a specific embodiment of the present invention, not in order to the restriction the present invention.
Wherein, what Fig. 1 provided is the sef-adapting filter on M rank, and u (n) is the input signal of forwarding antenna, and it is the input signal of receiving antenna that r (n) connects, T
sBe the parts (decomposing module among the following embodiment) that input signal is delayed time and decomposed, u (n-1), u (n-2) ...., the multichannel input signal of u (n-M+1) for decomposing by time-delay, e (n) is the error output signal, give multiplier and adder among the figure, what provide among the figure only is one embodiment of the present of invention, not in order to restriction the present invention.
As shown in Figure 2, take advantage of module 1221 that input signal u (n) is taken advantage of again with the error output signal e (n) that described filtration module generates again, calculate first median e* (n) the * u (n); Power computation module 1222 is calculated the power of described output signal e (n) || e (n) ||
2 Search module 1223 when the bit wide of described error output signal e (n) is 16, control is with 2^16 and described || e (n) ||
2Do division arithmetic, obtain the look-up table of the scope of described minimum quantization step-length lms_step, obtain described minimum quantization step-length by searching described look-up table; 1224 controls of the second median computing module are done multiplying with described module described median e* (n) u (n) that calculates and the minimum quantization step-length lms_step that described power computation module calculates of taking advantage of again, obtain second median e* (n) * u (n) the * lms_step.
Above-mentioned only is one embodiment of the present of invention, but not in order to restriction the present invention.
As shown in Figure 3, signal receiving module 111 receives the input signal u (n) of forwarding antenna and the input signal r (n) of reception antenna; The input signal u (n) of the forwarding antenna that 112 pairs of described signal receiving modules of decomposing module the receive decomposition of delaying time is resolved at least one road time delayed signal with described input signal u (n); The time delayed signal of the described input signal u (n) that 113 controls of the first multiplying control module are corresponding with it with every rank tap coefficient of filter is done multiplying; Every road time delayed signal that accumulator module 114 will be done after the multiplying carries out accumulating operation, obtains error output signal e (n).
Fig. 4 shows the realization flow of the filtering method of the sef-adapting filter that the embodiment of the invention provides, and its concrete step is as described below:
In step S401, filtration module is to the input signal u (n) of forwarding antenna delay time decomposition and generated error output signal e (n).
In step S402, the tap coefficient update module is obtained next tap coefficient constantly according to described error output signal e (n)
And upgrade the tap-weights of filter with described tap coefficient adjustment.
Wherein, as shown in Figure 5, this step S402 specifically comprises the steps:
In step S4021, the first coefficient update algorithm controls module is taken advantage of input signal u (n) again with the error output signal e (n) that described filtration module generates, and calculates first median e* (n) the * u (n).
In step S4022, the second coefficient update algorithm controls module is taken advantage of input signal u (n) again with the error output signal e (n) that described filtration module generates, obtain first median e* (n) the * u (n), and calculate the power of described output signal e (n) || e (n) ||
2, calculate second median e* (n) * u (n) the * lms_step.
In step S4023, algorithm switching controls module is monitored the work state information of the described first coefficient update algorithm controls module, when monitoring described work state information when satisfying the threshold condition set in advance, control finishes the operation of the described first coefficient update algorithm controls module, start the described second coefficient update algorithm controls module and carry out corresponding coefficient updating operation, wherein, when described sef-adapting filter startup work, the described first coefficient update algorithm controls module is carried out coefficient updating operation.
In step S4024, second median e* (n) * u (n) the * lms_step that first median e* (n) * u (n) that the described first coefficient update algorithm controls module of coefficient updating module calculates or the described second coefficient update algorithm controls module calculate and the tap coefficient of previous moment
Do add operation, obtain next tap coefficient constantly
Above-mentioned only is a specific embodiment of the present invention, not in order to the restriction the present invention.
The second coefficient update algorithm controls module that Fig. 6 shows the embodiment of the invention to be provided is taken advantage of input signal u (n) again with the error output signal e (n) that described filtration module generates, obtain first median e* (n) the * u (n), and calculate the power of described output signal e (n) || e (n) ||
2, calculate the specific implementation flow process of the step of second median e* (n) * u (n) the * lms_step, specific as follows described:
In step S601, take advantage of module that input signal u (n) is taken advantage of again with the error output signal e (n) that described filtration module generates again, calculate first median e* (n) the * u (n).
In step S602, power computation module is calculated the power of described output signal e (n) || e (n) ||
2
In step S603, when the bit wide of described error output signal e (n) is 16, search module controls with 2^16 and described || e (n) ||
2Do division arithmetic, obtain the look-up table of the scope of described minimum quantization step-length lms_step, obtain described minimum quantization step-length by searching described look-up table.
In step S604, the control of the second median computing module is done multiplying with described module described median e* (n) u (n) that calculates and the minimum quantization step-length lms_step that described power computation module calculates of taking advantage of again, obtains second median e* (n) * u (n) the * lms_step.
Above-mentioned only is one embodiment of the present of invention, this not in order to the restriction the present invention.
Fig. 7 shows filtration module that the embodiment of the invention provides to the input signal u (n) of the forwarding antenna decomposition of delaying time, and the realization flow of generated error output signal e (n), and its concrete step is as described below:
In step S701, signal receiving module receives the input signal u (n) of forwarding antenna and the input signal r (n) of reception antenna.
In step S702, the input signal u (n) of the forwarding antenna that decomposing module receives the described signal receiving module decomposition of delaying time is resolved at least one road time delayed signal with described input signal u (n).
In step S703, the time delayed signal of the described input signal u (n) that the control of the first multiplying control module is corresponding with it with every rank tap coefficient of filter is done multiplying.
In step S704, every road time delayed signal that accumulator module will be done after the multiplying carries out accumulating operation, obtains error output signal e (n).
In embodiments of the present invention, sef-adapting filter comprises filtration module and tap coefficient update module, wherein, when sef-adapting filter startup work, the first coefficient update algorithm controls module of tap coefficient update module is taken advantage of input signal u (n) again with the error output signal e (n) that described filtration module generates, calculate first median e* (n) the * u (n), coefficient updating module is with the tap coefficient of described first median e* (n) the * u (n) with previous moment
Do add operation, obtain next tap coefficient constantly
When algorithm switching controls module monitors when the work state information of the described first coefficient update algorithm controls module satisfies the threshold condition that sets in advance, control finishes the operation of the described first coefficient update algorithm controls module, start the described second coefficient update algorithm controls module and carry out corresponding coefficient updating operation, the described second coefficient update algorithm controls module is taken advantage of input signal u (n) again with the error output signal e (n) that described filtration module generates, obtain first median e* (n) the * u (n), and calculate the power of described output signal e (n) || e (n) ||
2, calculating second median e* (n) * u (n) the * lms_step, coefficient updating module is with the tap coefficient of described second median e* (n) * u (n) * lms_step and previous moment
Do add operation, obtain next tap coefficient constantly
When having solved the filter tap coefficients renewal, the great amount of hardware resources that the complex multiplication operation of complexity is consumed, the problem that the hardware time-delay is long, effective simultaneously advantage, the operating efficiency and the stability of raising sef-adapting filter in conjunction with lms algorithm and nlms algorithm.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a sef-adapting filter is characterized in that, described sef-adapting filter comprises filtration module and tap coefficient update module, wherein:
Filtration module is used for input signal u (n) to forwarding antenna delay time decomposition and generated error output signal e (n); And
The tap coefficient update module is used for according to described error output signal e (n), obtains next tap coefficient constantly
And upgrade the tap-weights of filter with described tap coefficient adjustment;
Described tap coefficient update module specifically comprises:
The first coefficient update algorithm controls module is used for input signal u (n) is taken advantage of again with the error output signal e (n) that described filtration module generates, and calculates first median e* (n) the * u (n);
The second coefficient update algorithm controls module is used for input signal u (n) is taken advantage of again with the error output signal e (n) that described filtration module generates, and obtains first median e* (n) the * u (n), and calculates the power of described output signal e (n) || e (n) ||
2, calculate second median e* (n) * u (n) the * lms_step;
Algorithm switching controls module, be used for the work state information of the described first coefficient update algorithm controls module is monitored, when monitoring described work state information when satisfying the threshold condition set in advance, control finishes the operation of the described first coefficient update algorithm controls module, start the described second coefficient update algorithm controls module and carry out corresponding coefficient updating operation, wherein, when described sef-adapting filter startup work, the described first coefficient update algorithm controls module is carried out coefficient updating operation; And
Coefficient updating module is used for second median e* (n) * u (n) the * lms_step that first median e* (n) the * u (n) that the described first coefficient update algorithm controls module calculates or the described second coefficient update algorithm controls module calculate and the tap coefficient of previous moment
Do add operation, obtain next tap coefficient constantly
2. sef-adapting filter as claimed in claim 1 is characterized in that, the described second coefficient update algorithm controls module specifically comprises:
Take advantage of module again, be used for input signal u (n) is taken advantage of again with the error output signal e (n) that described filtration module generates, calculate first median e* (n) the * u (n);
Power computation module is used to calculate the power of described output signal e (n) || e (n) ||
2
Search module, be used for when the bit wide of described error output signal e (n) is 16, control is with 2^16 and described || e (n) ‖
2Do division arithmetic, obtain the look-up table of the scope of described minimum quantization step-length lms_step, obtain described minimum quantization step-length by searching described look-up table; And
The second median computing module, be used to control described module described median e* (n) u (n) that calculates and the minimum quantization step-length lms_step that described power computation module calculates of taking advantage of again done multiplying, obtain second median e* (n) * u (n) the * lms_step.
3. sef-adapting filter as claimed in claim 1 is characterized in that, described filtration module specifically comprises:
Signal receiving module is used to receive the input signal u (n) of forwarding antenna and the input signal r (n) of reception antenna;
Decomposing module, the input signal u (n) that is used for forwarding antenna that described signal receiving module the is received decomposition of delaying time is resolved at least one road time delayed signal with described input signal u (n);
The first multiplying control module, the time delayed signal that is used to control the described input signal u (n) that every rank tap coefficient of filter is corresponding with it is done multiplying; And
Accumulator module, the every road time delayed signal that is used for doing after the multiplying carries out accumulating operation, obtains error output signal e (n).
4. filtering method based on the described sef-adapting filter of claim 1, its spy just is that described method comprises the steps:
Filtration module is to the input signal u (n) of forwarding antenna delay time decomposition and generated error output signal e (n); And
The tap coefficient update module is obtained next tap coefficient constantly according to described error output signal e (n)
And upgrade the tap-weights of filter with described tap coefficient adjustment;
Described tap coefficient update module is obtained next tap coefficient constantly according to described error output signal e (n)
And specifically comprise with the step that the tap-weights of filter is upgraded in described tap coefficient adjustment:
The first coefficient update algorithm controls module is taken advantage of input signal u (n) again with the error output signal e (n) that described filtration module generates, and calculates first median e* (n) the * u (n);
The second coefficient update algorithm controls module is taken advantage of input signal u (n) again with the error output signal e (n) that described filtration module generates, and obtains first median e* (n) the * u (n), and calculates the power of described output signal e (n) || e (n) ||
2, calculate second median e* (n) * u (n) the * lms_step;
Algorithm switching controls module is monitored the work state information of the described first coefficient update algorithm controls module, when monitoring described work state information when satisfying the threshold condition set in advance, control finishes the operation of the described first coefficient update algorithm controls module, start the described second coefficient update algorithm controls module and carry out corresponding coefficient updating operation, wherein, when described sef-adapting filter startup work, the described first coefficient update algorithm controls module is carried out coefficient updating operation;
Second median e* (n) * u (n) the * lms_step that first median e* (n) * u (n) that the described first coefficient update algorithm controls module of coefficient updating module calculates or the described second coefficient update algorithm controls module calculate and the tap coefficient of previous moment
Do add operation, obtain next tap coefficient constantly
5. method as claimed in claim 4, it is characterized in that, the described second coefficient update algorithm controls module is taken advantage of input signal u (n) again with the error output signal e (n) that described filtration module generates, obtain first median e* (n) the * u (n), and calculate the power of described output signal e (n) || e (n) ||
2, the step that calculates second median e* (n) * u (n) the * lms_step specifically comprises:
Take advantage of module that input signal u (n) is taken advantage of again with the error output signal e (n) that described filtration module generates again, calculate first median e* (n) the * u (n);
Power computation module is calculated the power of described output signal e (n) || e (n) ||
2
When the bit wide of described error output signal e (n) is 16, search module controls with 2^16 and described || e (n) ||
2Do division arithmetic, obtain the look-up table of the scope of described minimum quantization step-length lms_step, obtain described minimum quantization step-length by searching described look-up table;
The control of the second median computing module is done multiplying with described module described median e* (n) u (n) that calculates and the minimum quantization step-length lms_step that described power computation module calculates of taking advantage of again, obtains second median e* (n) * u (n) the * lms_step.
6. method as claimed in claim 4 is characterized in that, described filtration module is to the input signal u (n) of the forwarding antenna decomposition of delaying time, and the step of generated error output signal e (n) specifically comprises:
Signal receiving module receives the input signal u (n) of forwarding antenna and the input signal r (n) of reception antenna;
The input signal u (n) of the forwarding antenna that decomposing module receives the described signal receiving module decomposition of delaying time is resolved at least one road time delayed signal with described input signal u (n);
The time delayed signal of the described input signal u (n) that the control of the first multiplying control module is corresponding with it with every rank tap coefficient of filter is done multiplying;
Every road time delayed signal that accumulator module will be done after the multiplying carries out accumulating operation, obtains error output signal e (n).
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