CN101505287A - Order adaptive finite impulse response filter and operating method thereof - Google Patents
Order adaptive finite impulse response filter and operating method thereof Download PDFInfo
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- CN101505287A CN101505287A CNA2009100025046A CN200910002504A CN101505287A CN 101505287 A CN101505287 A CN 101505287A CN A2009100025046 A CNA2009100025046 A CN A2009100025046A CN 200910002504 A CN200910002504 A CN 200910002504A CN 101505287 A CN101505287 A CN 101505287A
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Abstract
The present invention discloses a device which can adaptively adjust the exponent number of finite impulse response wave filter with a specific use, wherein the device comprises the following components: a plurality of specific finite impulse response wave filter with a fixed exponent number each, at least one unspecific finite impulse response wave filter with a fixed exponent number, a control unit and an evaluating unit. At least one unspecific finite impulse response wave filter visibly interfere the response intensity and is connected with at least one in the plurality of specific finite impulse response wave filter in series thereby providing excellent signal quality.
Description
Technical field
The invention relates to the device and method of distribute digital filter resource, particularly about according to the device and method of distribute digital filter resource adaptively with the relevant parameter of decision digital filter exponent number (tap number).
Background technology
The composed component of digital filter comprises adder, multiplier and/or delay element etc., is different from the composed component of analog filter such as resistance, electric capacity, inductance etc.Because digital filter has the constancy of temperature, and is not high for the sensitivity of temperature change as adder, multiplier and delay element etc., so, promptly can reach certain accuracy and stability as long as suitably determine the parameter of digital filter.。
Generally speaking, digital filter comprises finite impulse response (FIR) (finite impulse response) filter and infinite impulse response (infinite impulse response) filter, finite impulse response filter with the N rank is an example, relation between its input signal and the output signal, can represent by following difference equation (1) and transfer function thereof:
Wherein, x[n-i] be input signal, y[n] be output signal, N is the exponent number (tap number) of filter or is called length, b
iCoefficient for filter.In addition, shown in equation (1) was right-hand, the filter on N rank had (N+1) item altogether.H[z] be y[n] the Z transfer function.
Know as institute in the technical field herewith, illustrational N rank finite impulse response filter can be represented with calcspar shown in Figure 1.
Generally speaking, the exponent number of finite impulse response filter the more, then filter effect is better, still, exponent number the more, then cost is higher.
Fig. 2 is a calcspar, shows the framework 200 of adaptability finite impulse response filter.As known to, adaptive filter uses feedback to adjust the coefficient of filter voluntarily.As shown in Figure 2, Correction Processor 202 is according to the output of finite impulse response filter 201
With the Error Feedback of desired signal u (n) and the input x (n) of finite impulse response filter (=u (n)+i (n)), the coefficient of adjusting finite impulse response filter 201 is so that output
Optimization, wherein, x (n)=u (n)+i (n), i (n) is an interference noise.Therefore, the adaptability finite impulse response filter often is used to predict in advance the interference signals processing.
The application of finite impulse response filter is very extensive.For example, in the Ethernet on-line Application, can use finite impulse response filter, disturb to eliminate various signals.In Ethernet is online, use the maskless twisted wire of many groups to the situation online as multichannel in, in a channel, when transmitting, signal can cause near-end crosstalk (near-end cross talk in the echogenicity of channel (echo) interference own and to adjacent passage, be called for short NEXT), and passage itself can be subjected to the near-end crosstalk from adjacency channel.In this case, can use finite impulse response filter to eliminate these interference sources or noise in the passage.Owing to the exponent number of finite impulse response filter is promptly looked application scenarios at circuit design stage and is designed to fixedly exponent number, so, when limited impulse response filter is actually used in different application, signal quality may can't obtain good filtering effect because of for example changing factors such as connection quality, line length or communication environment, that is, the finite impulse response filter of exponent number predetermined fixed can't also or in order to design filter order too much in response to worst-case conditions cause meaningless waste adaptively in response to the interference under the environmental change.For example, the fixing M of use rank finite impulse response filter resource is handled echo interference, when fixing in addition use M rank finite impulse response filter resource is handled near-end crosstalk, when slightly and only need being less than M rank resource, echo interference carries out filtering, in the time of need carrying out filtering more than M rank resource but near-end crosstalk is serious, promptly producing waste aspect the echo interference processing, but in the situation that occurs the filter effect deficiency aspect the near-end crosstalk processing.
Therefore, needing can be under limited filter resource, promptly under the total exponent number of filter immobilizes situation, looks applied environment and adjusts the device and method of the resource of distributing finite filter adaptively, uses to obtain to meet required excellent signal quality.
Summary of the invention
Take into account above-mentionedly, the invention provides can be according to the device and method of the adaptability distribution finite impulse response filter resource with the relevant parameter of decision filter order.
According to an aspect of the present invention, provide adaptability to adjust the device of the finite impulse response filter exponent number of special-purpose, with so that the best in qualityization of transmission signals, it comprises: a plurality of specific finite impulse response filters, each specific finite impulse response filter has fixedly exponent number separately, input receives and causes the signal specific separately of certain interference separately, and according to separately filter coefficient providing, in order to eliminate the certain interference separately that signal specific separately causes in this transmission signals corresponding to the impulse compensation of certain interference separately; At least one nonspecific finite impulse response filter has fixing exponent number, the arbitrary specific finite impulse response filter in adaptability ground these a plurality of specific finite impulse response filters of serial connection; Control unit makes up with the different serial connections of these a plurality of specific finite impulse response filters in order to control this at least one nonspecific finite impulse response filter; And assessment unit, the pairing signal quality of assessment various combination is found out the combination of a corresponding optimum signal quality, and impels this control unit to choose this serial connection combination to be used for eliminating the interference of this transmission signals.
According to a further aspect in the invention, provide a kind of finite impulse response filter device, comprise: the first finite impulse response filter circuit, have the first fixing exponent number, be used for filtering first signal; The second finite impulse response filter circuit has the second fixing exponent number, is used for the filtering secondary signal, and wherein this secondary signal is different from this first signal; Switching circuit couples this first and second finite impulse response filter circuit respectively; Nonspecific finite impulse response filter circuit has the 3rd fixing exponent number; Evaluation circuits is used for assessing the effect of this first signal of filtering and the effect of this secondary signal of assessment filtering according to one or more parameter, to produce one or more assessment result; And control circuit, be used for being coupled to this first finite impulse response filter circuit via this switching circuit according to the M rank that this one or more assessment result will this nonspecific finite impulse response filter circuit, and N rank that will this nonspecific finite impulse response filter circuit are coupled to this second finite impulse response filter circuit via this switching circuit, and wherein this M and this N are zero or positive integer.
In accordance with a further aspect of the present invention, a kind of Ethernet communication device is provided, has the assignable function of finite impulse response filter resource, this Ethernet communication device comprises transceiver, this transceiver comprises: the first finite impulse response filter circuit, have the first fixing exponent number, be used for filtering first signal; The second finite impulse response filter circuit has the second fixing exponent number, is used for the filtering secondary signal, and wherein this secondary signal is different from this first signal; Switching circuit couples this first and second finite impulse response filter circuit respectively; Nonspecific finite impulse response filter circuit has the 3rd fixing exponent number; Evaluation circuits is used for assessing the effect of this first signal of filtering and the effect of this secondary signal of assessment filtering according to one or more parameter, to produce one or more assessment result; And control circuit, be used for being coupled to this first finite impulse response filter circuit via this switching circuit according to the M rank that this one or more assessment result will this nonspecific finite impulse response filter circuit, and N rank that will this nonspecific finite impulse response filter circuit are coupled to this second finite impulse response filter circuit via this switching circuit, and wherein this M and this N are zero or positive integer.
According to a further aspect in the invention, a kind of Ethernet communication device is provided, has the assignable function of finite impulse response filter resource, this Ethernet communication device comprises: first transceiver, this first transceiver comprises: the first finite impulse response filter circuit, have the first fixing exponent number, be used for filtering first signal; Second transceiver, this second transceiver comprises: the second finite impulse response filter circuit, have the second fixing exponent number, be used for the filtering secondary signal, wherein this secondary signal is different from this first signal; Switching circuit couples this first and second finite impulse response filter circuit respectively; Nonspecific finite impulse response filter circuit has the 3rd fixing exponent number; Evaluation circuits is used for assessing the effect of this first signal of filtering and the effect of this secondary signal of assessment filtering according to one or more parameter, to produce one or more assessment result; And control circuit, be used for being coupled to this first finite impulse response filter circuit via this switching circuit according to the M rank that this one or more assessment result will this nonspecific finite impulse response filter circuit, and N rank that will this nonspecific finite impulse response filter circuit are coupled to this second finite impulse response filter circuit via this switching circuit, and wherein this M and this N are zero or positive integer.
In accordance with a further aspect of the present invention, a kind of Ethernet communication device is provided, has the assignable function of finite impulse response filter resource, this Ethernet communication device comprises: first transceiver, be used for receiving first signal, this first transceiver comprises: the first finite impulse response filter circuit is used for this first signal of filtering; 0 and the first nonspecific finite impulse response filter circuit has the first fixing exponent number; Second transceiver is used for receiving secondary signal, and this second transceiver comprises: the second finite impulse response filter circuit is used for this secondary signal of filtering; And the second nonspecific finite impulse response filter circuit, have the second fixing exponent number; Switching circuit couples this first and second nonspecific finite impulse response filter circuit respectively; Evaluation circuits is used for assessing the effect of this first signal of filtering and the effect of this secondary signal of assessment filtering according to one or more parameter, to produce one or more assessment result; And control circuit, be used for the M rank in the exponent number summation of this first and second nonspecific finite impulse response filter circuit being coupled to this first finite impulse response filter circuit via this switching circuit according to this one or more assessment result, and the N rank in the exponent number summation of this first and second nonspecific finite impulse response filter circuit are coupled to this second finite impulse response filter circuit via this switching circuit, wherein this M and this N are zero or positive integer.
According to another aspect of the invention, provide adaptability to adjust the method for the finite impulse response filter exponent number of special-purpose, with so that the best in qualityization of transmission signals, comprise the steps: to be provided with a plurality of specific finite impulse response filters, each specific finite impulse response filter has fixedly exponent number separately, input receives and causes the signal specific separately of certain interference separately, and according to separately filter coefficient providing, in order to eliminate the certain interference separately that signal specific separately causes in this transmission signals corresponding to the impulse compensation of certain interference separately; At least one nonspecific finite impulse response filter is set, this at least one nonspecific finite impulse response filter has fixedly exponent number, and, the arbitrary specific finite impulse response filter in adaptability ground these a plurality of specific finite impulse response filters of serial connection; Serial connection combination results step, at least one nonspecific finite impulse response filter forms different serial connection combinations with these a plurality of specific finite impulse response filters with this; And appraisal procedure, the pairing signal quality of assessment various combination is found out the combination of corresponding optimum signal quality, and will be connected in series the interference that combination is used for eliminating this transmission signals.
According to embodiments of the invention, the relevant parameter that the serial connection of filter makes up pairing signal quality can be the coefficient separately of this at least one nonspecific finite impulse response filter in this combination absolute value square sum total, the absolute value sum total or the signal noise ratio of coefficient separately, right the foregoing description is not restriction of the present invention, and those skilled in the art can use any known numerical value relevant with signal quality and compute mode obtains this relevant parameter.
In addition, device and method of the present invention can be used for but not limit due to network switch, hub, network router, network gateway, and server or data center.
From following embodiments of the invention explanation with reference to the accompanying drawings, when the effect that can be easier to understand purpose of the present invention, technology contents, characteristics and be reached.
Description of drawings
Fig. 1 is a calcspar, shows an example of N rank finite impulse response filter;
Fig. 2 is a calcspar, shows an example of adaptability finite impulse response filter framework;
Fig. 3 shows the device according to adaptive finite impulse response filter exponent number of the present invention; And
Fig. 4 shows communication device embodiment, and it has the device according to adaptive finite impulse response filter exponent number of the present invention.
[main element label declaration]
200 adaptability finite impulse response filters
201 finite impulse response filters
202 Correction Processors
The device of 301 adaptive finite impulse response filter exponent numbers
302 assessment units
304 control units
The specific FIR of 3061-306k
The 3081-308j multiplexer
The nonspecific FIR of 3101-310j
400 communication devices
402 signalling generators
403 reception devices
405 adders
406 equalizers
Embodiment
The invention provides adaptability and adjust the device and method of exponent number of the finite impulse response filter (hereinafter to be referred as FIR) of special-purpose.In an embodiment according to the present invention, be provided with the nonspecific FIR that is used to eliminate the specific FIR of certain interference and is used for the adaptability configuration, and, according to the signal quality of the various combination of specific and nonspecific FIR, decision can obtain the signal with lowest interference specific and nonspecific FIR be connected in series combination.
Fig. 3 is a calcspar, shows the device 300 of adjusting the FIR exponent number according to adaptability of the present invention.As shown in Figure 3, device 300 according to the present invention comprise assessment unit 302, control unit 304, a k specific FIR 3061 to 306k, a j switching circuit (Switching Circuit, for example multiplexer) 3081 to 308j, and the individual nonspecific FIR of j 3101 to 310j.Specific FIR 3061 to 306k respectively according to the signal that inputs to it producing compensation corresponding to each interference, nonspecific FIR 3101 to 310j with the exponent number of the specific FIR that extends, uses further elimination certain interference in order to be serially connected in adaptively after the specific FIR.The nonspecific FIR of control unit 304 controls makes up with the different serial connections of specific FIR, and assessment unit 302 can be eliminated the specific FIR of interference and the best of breed of nonspecific FIR according to the response intensity of different serial connection combinations well with decision.
Generally speaking, in different application, signal can be subjected to multiple different certain interference when being transmitted or handle.These specific signal are disturbed has discernible different characteristic, and when some specific interference had remarkable influence to signal quality, it can become the interference that will eliminate.Therefore, devices in accordance with embodiments of the present invention 300 can be provided with the fixing specific FIR 3061 of exponent number along with different application to 306k, responds the certain interference of eliminating in institute's transmission signals to produce.Specific FIR 3061 is to 306k, and the situation that can look application is to be used to eliminate at least a above different certain interference.For example, FIR3061 and 3062 is used to disturb A, and remaining specific FIR 3063 is used to disturb B, wherein, FIR 3061 and 3062 exponent number fix and the two the visual application of exponent number and be identical or different, be used to disturb the exponent number of the specific FIR of B also to can be identical or different for fixing and exponent number each other.Perhaps, all FIR is that specific FIR and the exponent number that is used for same certain interference all fixed.In other words, the exponent number of each specific FIR can be according to design requirement for being same to each other or different to each other.
In device 300, the exponent number of unspecific FIR 3101 to FIR 310j is identical or different for fixing and the visual demand of exponent number each other also.When the exponent number of the specific FIR that is used for certain interference as mentioned above is not enough to eliminate certain interference and can't obtains the good signal quality, among the unspecific FIR3101 to 310j at least for a moment by serial connection to the described specific FIR, be enough to eliminate the compensation of interference with generation.
Then, will to be applied to Ethernet be example to install 300, to further specify its operation.
Generally speaking, device can carry out test operation earlier 300 when being used for different application, in this test operation, and the best of breed of specific and nonspecific FIR in described applied environment in can determination device 300.
In Ethernet is online,, when in channel, sending signal, can in channel itself, causes the echo interference, and adjacency channel be caused the interference of near-end crosstalk (NEXT) if use the maskless twisted wire of many groups to the time as the online media of a plurality of channels.In other words, the signal of the transmission of the end in the passage can produce an interference source and other passage is produced another interference source in this channel.For example, have in the Ethernet of four-way A, B, C and D, the echo that channel A can suffer itself to produce is disturbed, and also is subjected to simultaneously disturbing from the near-end crosstalk of channel B, C or D.As known to as, with maskless twisted wire in connecting as the Ethernet of signaling channel, but echo is disturbed and near-end crosstalk is disturbed and is respectively the remarkable interference with different identification features.
When being applied to Ethernet that four channels connect (channel A, B, C, D) and connecting channel A in the (not shown), the specific FIR number of device in 300 be that 4 (k=4) are respectively that echo is eliminated FIR 3061 and near-end crosstalk is eliminated FIR 3062,3063,3064, nonspecific FIR 3101 and 3102 number are 2 (j=2).Echo is eliminated FIR 3061 and is used to eliminate that the echo that signal caused that passage A sends itself is disturbed and exponent number is preset as L
Echo, near-end crosstalk elimination FIR 3062,3063,3064 is respectively applied for elimination and from adjacency channel B, C, D near-end crosstalk interference and the exponent number that passage A causes is preset as L
NEXTThe nonspecific FIR 3101 of two adaptability configurations and 3102 exponent number are respectively L
NECAnd L
NEDAs known to because echo disturbs the channel response exponent number caused to disturb the channel response exponent number that is caused much larger than near-end crosstalk, so echo is eliminated the exponent number of FIR and is preferably set the exponent number of eliminating FIR much larger than near-end crosstalk for, that is, L
EchoMuch larger than L
NEXTIn addition, specific and nonspecific FIR as used herein is adaptability FIR.
Fig. 4 shows to have the communication device 400 of adjusting the device of FIR exponent number according to adaptability of the present invention.As shown in Figure 4, communication device 400 comprises medium access control layer (MAC), physics sign indicating number beggar layer (PCS), reduction kilomegabit Media Independent Interface layer (RGMII), reaches physical layer (PHY).Physical layer comprises signalling generator 402 and reception device 403, is located in the reception device 403 according to the device 300 of the embodiment of the invention.Reception device 403 comprises adder 405 again, reaches equalizer 406.
When device 300 is arranged in the communication device 400, and during the communication device R (not shown) connection of installing 400 the channel A in online is corresponding with another via Ethernet, before normal running, can test in advance.Communication device 400 and communication device R can be personal computer, network switch, hub, router, gateway, server, data center or similarly install.
At test period in advance, communication device 400 sends signal SA via channel A, and simultaneously, corresponding communication device R can be with primary signal S
0Be sent to communication device 400 via channel A.For communication device 400, the signal SR that is received comprises primary signal S
0, the signal SA echo of causing disturbs S
EchoA, the signal SB that sends of channel B disturbs S to the near-end crosstalk that channel A is caused
NextB, the near-end crosstalk that caused of the signal SC that sends of channel C disturbs S
NextC, the near-end crosstalk that caused of the signal SD that sends of channel D disturbs S
NextD, and other noise S
NoiseThat is SR can be expressed as:
SR＝S
0+S
echoA+S
nextB+S
nextC+S
nextD+S
noise
Herein, S
NoiseThe response that causes is not remarkable, is not object to be processed, so in explanation backward, will be ignored.
Therefore, if signal SR is cut possible maximum interference response S
EchoA+ S
NextB+ S
NextC+ S
NextD, can obtain best signal transmission news quality.
According to above-mentioned, in device 300, eliminate the various combination of FIR 3061 or near-end crosstalk elimination FIR 3062,3063,3064 as long as be connected to echo from nonspecific FIR, find out the combination that the maximum impulse response intensity is provided, can obtain best communication quality.Note, because the amplitude of the coefficient of FIR representative response, so, can represent the response intensity that produced with the coefficient of FIR in following.
In the present embodiment, with the signal quality of total incompatible this kind of the assessment serial connection mode of squared absolute value of the coefficient separately that is serially connected with the nonspecific FIR after the specific FIR, by assessing the pairing signal quality of different serial connection modes to determine best FIR combination.Certainly, the above-mentioned utilization mode of the squared absolute value sum total of coefficient separately is not restriction of the present invention, can be used as the foundation of evaluation of signal quality with absolute value sum total, noise ratio (SNR) or the predetermined critical value of for example each coefficient yet.Those skilled in the art can use any known numerical value relevant with signal quality and compute mode obtains this signal quality relevant parameter.
Now, again with reference to figure 3, illustrate the evaluation operation of decision response intensity.
When device 300 is located in the communication device 400 when being used for passage A, the input that echo is eliminated FIR 3061 receives signal SA (input 1) that communication device 400 sends, input that near-end crosstalk is eliminated FIR 3062,3063,3064 receive path B, C, and the signal SB (input 2), the SC (input 3) that send of D, and SD (input 4) respectively.
At first, at Qi Shishi, assessment unit 302 judges according to index values such as for example SNR whether present FIR configuration is enough to provide the good communication quality.If not, then carry out the test of various configurations, the impulse response intensity that is produced when eliminating FIR 3061 received signal SA by assessment unit 302 according to echo is with the exponent number L of decision FIR 3061
EchoWhether be enough to eliminate the response that echo interference is caused.If not, then under the control of control unit 304, nonspecific FIR 3101 is connected to echo eliminates FIR 3061, and with the estimation as signal quality of the summed square of the absolute value of indivedual coefficients of FIR3101 this moment.For example, if the exponent number of FIR 3101 is L
NEC, in this case, its separately coefficient be b
1[0] ... b
1[L
NEC-1] time, then the estimation of signal quality can be expressed as | b
1[0] |
2+ ... | b
1[L
NEC-1] |
2Then, similarly, FIR 3102 is serially connected with FIR 3061 also carries out similarly processing afterwards, to obtain the estimation of its signal quality.Then, FIR 3101 and 3102 is serially connected with after the FIR 3061, and carries out and similarly handle to obtain the estimation of corresponding signal quality.
If, at Qi Shishi, when assessment unit 302 judges that according to index values such as for example SNR present FIR configuration is not enough to provide the good communication quality, and assessment unit 302 is judged when the exponent number of FIR 3061 is enough to eliminate the echo interference, then under the control of control unit 304, near-end crosstalk is eliminated FIR 3062 carry out and be similar to above-mentioned processing, nonspecific FIR 3101,3102 or 3101 and 3102 is connected to near-end crosstalk eliminates after the FIR 3062, to obtain corresponding response intensity.Similarly, near-end crosstalk is eliminated FIR 3063 and 3064 and carry out similar operation and processing.
Similarly, assessment unit 302 determines best near-end crosstalk FIR and the combination of nonspecific FIR according to the response intensity of so obtaining.In the above description, for brevity, in order near-end crosstalk is separately eliminated the operation that FIR carries out the nonspecific FIR of serial connection, still, should be appreciated that, also can disturb FIR to be connected in series other nonspecific FIR of branch simultaneously each near-end crosstalk to find out best of breed.For example, FIR 3101 can be connected to after the FIR 3062, simultaneously, FIR 3102 be connected to after the FIR 3064, obtaining corresponding response intensity, and obtain according to this this use in preferable combination.
In above-mentioned, assessment unit 302 is with from the impulse response of each FIR basis for estimation as various FIR configurations.But the present invention is not limited to this.For example, when being basis for estimation with SNR, assessment unit 302 can receive from the output of equalizer 406 and make up with decision FIR.
In the above description, though in passage separately, all comprise specific, nonspecific FIR, assessment unit, control unit, or the like,, each passage also can comprise specific and unspecific FIR separately, but share assessment unit, control unit, or the like.Perhaps, the specific or nonspecific FIR of the money of each passage can exchange support, that is specific FIR in A channel or nonspecific FIR can be used at least one channel of other channel when needed whole or in part.Therefore, according to the present invention, best distribution can optionally be done in unit such as specific and nonspecific FIR, relevant assessment, control, to reach resource allocation optimization and signal quality optimization.
In above-mentioned, though be that example illustrates the present invention with the Ethernet, that is the present invention can be used for network switch, hub, network router, network gateway etc., application of the present invention is not limited to Ethernet.For example, the present invention can be used for wireless communication apparatus.In addition, though above-mentioned explanation is the example explanation to eliminate different interference sources,, the invention is not restricted to this, but can be used for for example adaptability configuration of multi-channel signal device FIR.For example, be equipped with m other FIR of branch to be used for the communication device of m channel, only have k channel to be used in m channel and other m-k passage do not use, k channel that the FIR of a untapped m-k passage can be used for using then is to promote its signal processing quality.Be all practical range of the present invention so long as can use FIR resource allocation person.
In addition, need illustrate: applicable cases of the present invention comprises at least:
(1) in a wherein transceiver of single communication device (for example aforementioned network interchanger, hub, network router, network gateway, wireless communication apparatus etc.), have a plurality of specific finite impulse response filters, each specific finite impulse response filter has fixedly exponent number separately, and other adaptively that one of them finite impulse response filter is outer with being positioned at this transceiver or this transceiver nonspecific finite impulse response filter is connected in series and increase its exponent number;
(2) in a plurality of transceivers of single communication device, respectively has at least one specific finite impulse response filter, each specific finite impulse response filter has fixedly exponent number separately, and other adaptively that one of them finite impulse response filter is outer with being positioned at these a plurality of transceivers or this a plurality of transceivers nonspecific finite impulse response filter is connected in series and increase its exponent number;
(3) in the affiliated separately transceiver of a plurality of communication devices, respectively has at least one specific finite impulse response filter, each specific finite impulse response filter has fixedly exponent number separately, and adaptively with one of them finite impulse response filter with and its corresponding transceiver in or outer other nonspecific finite impulse response filter serial connection of transceiver and increase its exponent number.
More than in three kinds of situations, nonspecific finite impulse response filter can be arranged on the circuit other parts with the specific finite impulse response filter position of desiring the mat serial connection and increase exponent number in same transceiver or in the different transceiver or not in transceiver.
The visual applied environment of the present invention and adjust the exponent number of finite impulse response filter adaptively, the exponent number that can overcome the finite impulse response filter of prior art is the shortcoming that predetermined fixed and the state that can't look environmental change or interference signal change, thereby has the advantage that obtains excellent signal quality within limited cost.The present invention can be according to interference strength or according to parameter next resources of with decision how distributing filter relevant with the exponent number of decision filter such as instantaneous frequency ranges (transition bandwidth), make the signal quality optimization, for example when a certain specific FIR be responsible for the processing the signal transient frequency range wideer, the present invention can distribute the exponent number of more nonspecific FIR to give this specific FIR.
According to the device of adaptability adjustment FIR exponent number of the present invention, can under limited circuit cost and power consumption resource, eliminate the response of the various interference sources in the passage, to guarantee signal transfer quality.
Though in the above description, the present invention is described with embodiment,, the invention is not restricted to the specific detail that is disclosed.Under not departing from spirit of the present invention and claims scope and impartial scope thereof, those skilled in the art can produce different variations, modification, substitute, or the like.
Claims (22)
1. finite impulse response filter device comprises:
The first finite impulse response filter circuit has the first fixing exponent number, is used for filtering first signal;
The second finite impulse response filter circuit has the second fixing exponent number, is used for the filtering secondary signal, and wherein this secondary signal is different from this first signal;
Switching circuit couples this first and second finite impulse response filter circuit respectively;
Nonspecific finite impulse response filter circuit has the 3rd fixing exponent number;
Evaluation circuits is used for assessing the effect of this first signal of filtering and the effect of this secondary signal of assessment filtering according to one or more parameter, to produce one or more assessment result; And
Control circuit, be used for being coupled to this first finite impulse response filter circuit via this switching circuit according to the M rank that this one or more assessment result will this nonspecific finite impulse response filter circuit, and N rank that will this nonspecific finite impulse response filter circuit are coupled to this second finite impulse response filter circuit via this switching circuit, and wherein this M and this N are zero or positive integer.
2. device according to claim 1, wherein this M and this N and equal the 3rd fixing exponent number.
3. device according to claim 1, wherein this M and this first fixedly exponent number and be different from this N with this second fixedly exponent number with.
4. device according to claim 1, wherein the exponent number that this control circuit will this nonspecific finite impulse response filter circuit is coupled to this first pulse bandwidth filtering circuit via this switching circuit at the most or by as many as is few by few in regular turn, this evaluation circuits couples the variation of relation according to the effect of this one or more parameter with this first signal of assessment filtering along with this nonspecific finite impulse response filter circuit and this first pulse bandwidth filtering circuit, and produces this one or more assessment result.
5. device according to claim 4, wherein the exponent number that this control circuit will this nonspecific finite impulse response filter circuit successively decreases in regular turn or incrementally is coupled to this second pulse bandwidth filtering circuit via this switching circuit, this evaluation circuits couples the variation of relation according to the effect of this one or more parameter with this secondary signal of assessment filtering along with this nonspecific finite impulse response filter circuit and this second pulse bandwidth filtering circuit, and produces this one or more assessment result.
6. device according to claim 1, wherein this one or more parameter be the operation values of each rank coefficient of operation values, this second finite impulse response filter of each rank coefficient of signal to noise ratio, this first finite impulse response filter and bit error rate at least one of them.
7. an Ethernet communication device has the assignable function of finite impulse response filter resource, and this Ethernet communication device comprises transceiver, and this transceiver comprises:
The first finite impulse response filter circuit has the first fixing exponent number, is used for filtering first signal;
The second finite impulse response filter circuit has the second fixing exponent number, is used for the filtering secondary signal, and wherein this secondary signal is different from this first signal;
Switching circuit couples this first and second finite impulse response filter circuit respectively;
Nonspecific finite impulse response filter circuit has the 3rd fixing exponent number;
Evaluation circuits is used for assessing the effect of this first signal of filtering and the effect of this secondary signal of assessment filtering according to one or more parameter, to produce one or more assessment result; And
Control circuit, be used for being coupled to this first finite impulse response filter circuit via this switching circuit according to the M rank that this one or more assessment result will this nonspecific finite impulse response filter circuit, and N rank that will this nonspecific finite impulse response filter circuit are coupled to this second finite impulse response filter circuit via this switching circuit, and wherein this M and this N are zero or positive integer.
8. device according to claim 7, wherein this M and this N and equal the 3rd fixing exponent number.
9. device according to claim 7, wherein this M and this first fixedly exponent number and be different from this N with this second fixedly exponent number with.
10. device according to claim 7, wherein the exponent number that this control circuit will this nonspecific finite impulse response filter circuit is coupled to this first pulse bandwidth filtering circuit via this switching circuit at the most or by as many as is few by few in regular turn, this evaluation circuits couples the variation of relation according to the effect of this one or more parameter with this first signal of assessment filtering along with this nonspecific finite impulse response filter circuit and this first pulse bandwidth filtering circuit, and produces this one or more assessment result.
11. device according to claim 10, wherein the exponent number that this control circuit will this nonspecific finite impulse response filter circuit successively decreases in regular turn or incrementally is coupled to this second pulse bandwidth filtering circuit via this switching circuit, this evaluation circuits couples the variation of relation according to the effect of this one or more parameter with this secondary signal of assessment filtering along with this nonspecific finite impulse response filter circuit and this second pulse bandwidth filtering circuit, and produces this one or more assessment result.
12. device according to claim 7, wherein this one or more parameter be the operation values of each rank coefficient of operation values, this second finite impulse response filter of each rank coefficient of signal to noise ratio, this first finite impulse response filter and bit error rate at least one of them.
13. an Ethernet communication device has the assignable function of finite impulse response filter resource, this Ethernet communication device comprises:
First transceiver, this first transceiver comprises:
The first finite impulse response filter circuit has the first fixing exponent number, is used for filtering first signal;
Second transceiver, this second transceiver comprises:
The second finite impulse response filter circuit has the second fixing exponent number, is used for the filtering secondary signal, and wherein this secondary signal is different from this first signal;
Switching circuit couples this first and second finite impulse response filter circuit respectively;
Nonspecific finite impulse response filter circuit has the 3rd fixing exponent number;
Evaluation circuits is used for assessing the effect of this first signal of filtering and the effect of this secondary signal of assessment filtering according to one or more parameter, to produce one or more assessment result; And
Control circuit, be used for being coupled to this first finite impulse response filter circuit via this switching circuit according to the M rank that this one or more assessment result will this nonspecific finite impulse response filter circuit, and N rank that will this nonspecific finite impulse response filter circuit are coupled to this second finite impulse response filter circuit via this switching circuit, and wherein this M and this N are zero or positive integer.
14. device according to claim 13, wherein this M and this N and equal the 3rd fixing exponent number.
15. device according to claim 13, wherein this M and this first fixedly exponent number and be different from this N with this second fixedly exponent number with.
16. device according to claim 13, wherein the exponent number that this control circuit will this nonspecific finite impulse response filter circuit is coupled to this first pulse bandwidth filtering circuit via this switching circuit at the most or by as many as is few by few in regular turn, this evaluation circuits couples the variation of relation according to the effect of this one or more parameter with this first signal of assessment filtering along with this nonspecific finite impulse response filter circuit and this first pulse bandwidth filtering circuit, and produces this one or more assessment result.
17. device according to claim 16, wherein the exponent number that this control circuit will this nonspecific finite impulse response filter circuit successively decreases in regular turn or incrementally is coupled to this second pulse bandwidth filtering circuit via this switching circuit, this evaluation circuits couples the variation of relation according to the effect of this one or more parameter with this secondary signal of assessment filtering along with this nonspecific finite impulse response filter circuit and this second pulse bandwidth filtering circuit, and produces this one or more assessment result.
18. device according to claim 13, wherein this one or more parameter be the operation values of each rank coefficient of operation values, this second finite impulse response filter of each rank coefficient of signal to noise ratio, this first finite impulse response filter and bit error rate at least one of them.
19. device according to claim 13, wherein this nonspecific finite impulse response filter circuit can be arranged in this first transceiver or in this second transceiver or be distributed in this first and second transceiver or independently be arranged at outside this first and second transceiver.
20. an Ethernet communication device has the assignable function of finite impulse response filter resource, this Ethernet communication device comprises:
First transceiver is used for receiving first signal, and this first transceiver comprises:
The first finite impulse response filter circuit is used for this first signal of filtering; And
The first nonspecific finite impulse response filter circuit has the first fixing exponent number;
Second transceiver is used for receiving secondary signal, and this second transceiver comprises:
The second finite impulse response filter circuit is used for this secondary signal of filtering; And
The second nonspecific finite impulse response filter circuit has the second fixing exponent number;
Switching circuit couples this first and second nonspecific finite impulse response filter circuit respectively;
Evaluation circuits is used for assessing the effect of this first signal of filtering and the effect of this secondary signal of assessment filtering according to one or more parameter, to produce one or more assessment result; And
Control circuit, be used for the M rank in the exponent number summation of this first and second nonspecific finite impulse response filter circuit being coupled to this first finite impulse response filter circuit via this switching circuit according to this one or more assessment result, and the N rank in the exponent number summation of this first and second nonspecific finite impulse response filter circuit are coupled to this second finite impulse response filter circuit via this switching circuit, wherein this M and this N are zero or positive integer.
21. device according to claim 20, wherein this M and this N and equal this first and second fixedly exponent number and.
22. device according to claim 20, wherein this one or more parameter be the operation values of each rank coefficient of operation values, this second finite impulse response filter of each rank coefficient of signal to noise ratio, this first finite impulse response filter and bit error rate at least one of them.
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| Application Number | Priority Date | Filing Date | Title |
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| US2609908P | 2008-02-04 | 2008-02-04 | |
| US61/026,099 | 2008-02-04 |
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| CN101505287B CN101505287B (en) | 2012-03-21 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105306092A (en) * | 2014-06-10 | 2016-02-03 | 苹果公司 | Intermodulation Cancellation of Third-order Distortion in an FDD Receiver |
| CN114928349A (en) * | 2022-06-27 | 2022-08-19 | 奉加微电子（昆山）有限公司 | Continuous time pipeline analog-to-digital converter and digital reconstruction filter thereof |
| CN115425998A (en) * | 2022-11-08 | 2022-12-02 | 长沙驰芯半导体科技有限公司 | Multi-order multi-band anti-interference intelligent ultra-wideband antenna self-adaptation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI472151B (en) * | 2011-08-30 | 2015-02-01 | Richwave Technology Corp | Filter system capable of automatically adjusting bandwidth and method of automatically adjusting bandwidth of a filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1655468B (en) * | 2004-02-09 | 2010-05-05 | 瑞昱半导体股份有限公司 | Adjustable echo eliminating apparatus for all duplex communication systems |
| US8014516B2 (en) * | 2006-01-27 | 2011-09-06 | Mediatek Inc. | Method and apparatus for echo cancellation |
| WO2007102611A1 (en) * | 2006-03-07 | 2007-09-13 | Neuro Solution Corp. | Interpolation function generation circuit |
-
2008
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105306092A (en) * | 2014-06-10 | 2016-02-03 | 苹果公司 | Intermodulation Cancellation of Third-order Distortion in an FDD Receiver |
| CN114928349A (en) * | 2022-06-27 | 2022-08-19 | 奉加微电子（昆山）有限公司 | Continuous time pipeline analog-to-digital converter and digital reconstruction filter thereof |
| CN114928349B (en) * | 2022-06-27 | 2024-02-27 | 奉加微电子（昆山）有限公司 | Continuous time pipeline analog-to-digital converter and digital reconstruction filter thereof |
| CN115425998A (en) * | 2022-11-08 | 2022-12-02 | 长沙驰芯半导体科技有限公司 | Multi-order multi-band anti-interference intelligent ultra-wideband antenna self-adaptation method |
Also Published As
| Publication number | Publication date |
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| TW200935736A (en) | 2009-08-16 |
| TWI374609B (en) | 2012-10-11 |
| CN101505287B (en) | 2012-03-21 |
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