CN104243367A - Receiving device and method for accelerating equalization convergence - Google Patents
Receiving device and method for accelerating equalization convergence Download PDFInfo
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- CN104243367A CN104243367A CN201310236626.8A CN201310236626A CN104243367A CN 104243367 A CN104243367 A CN 104243367A CN 201310236626 A CN201310236626 A CN 201310236626A CN 104243367 A CN104243367 A CN 104243367A
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Abstract
The invention provides a receiving device and method for accelerating equalization convergence. The device and method are applied to the receiving end of a communication device. The communication device comprises an equalizer. The receiving device comprises a filter and a channel estimator, wherein the filter is used for filtering a received signal so that the multi-path effect of the received signal can be reduced, and outputting a filtered signal, the channel estimator is used for carrying out channel estimation on the received signal, and thus generating an estimation result, and which one of the received signal and the filtered signal is selected to be transmitted to the equalizer according to the estimation result.
Description
Technical field
The present invention has about a kind of receiver, particularly about a kind of receiver according to the filtering in advance of passage estimated result.
Background technology
In modern communication technology, the communication protocol that transmission end and receiving terminal all can utilize both sides to understand or standard, in order to the communication of both sides.The signal that transmission end sends, through transmission channel or passage (channel), received by receiving terminal.Because signal is being gone through in transmission channel, many interference or noise may be mixed into, signal is also decayed in the process, and therefore receiving terminal all can first utilize pilot signal (pilot signal) known in the middle of signal to carry out channel estimation (channel estimation) mostly.After passage to cause the impact of what sample on signal estimating, then to carry out etc. changing (equalization) step to received signal, just can reduce the primary signal that transmission end sends as far as possible.
Please refer to shown in Fig. 1, it is the model schematic of prior art to channels spread.The signal that transmission end 110 sends with x (n) as representing, the signal that receiving terminal 130 receives with y (n) as representing.Signal x (n) can through the distortion of passage 120 and pollution.
In some cases, passage 120 may cause multipath (multipath) effect of more complicated.So-called multipath effect is because signal x (n) arrives at receiving terminal 130 through mulitpath, different in size due to these paths, and therefore signal x (n) can successively arrive at receiving terminal 130.Signal x (n) strength retrogression that multipath effect not only can cause every paths to transmit, delays the signal arrived at and more may cause interference to follow-up signal.In FIG, multipath effect for the impact of signal with h (n) as representing.
Except the signal skew that multipath effect h (n) causes, the passage 120 generally do not disturbed especially also can receive random interference.Usually be referred to as Additive White Gaussian to make an uproar news (AWGN, Additive White Gaussian Noise), in FIG with w (n) as representing.
After multipath effect h (n) and Additive White Gaussian make an uproar the distortion of interrogate w (n) and pollution, the signal that receiving terminal 130 receives can through a channel estimation module 132.Utilize the estimation of channel impulse response (CIR, Channel Impulse Response), this channel estimation module can pass to first device 134 estimation message out, the distortion caused for signal for compensation channels 120 and pollution.The signal exported after this eqalizing cricuit 134 is compensated
, signal x (n) that will spread out of close to transmission end 110.
Although above-mentioned traditional channel estimation module 132 can deal with multipath effect, for the same intensity signal arrived at through multiple path, often need the time very of a specified duration to process with pulling over, the compensation of eqalizing cricuit 134 can converge to operable degree.
Please refer to shown in Fig. 2 A, it is that the generation of a certain multipath effect represents intention.The figure shows the signal that transmission end 110 sends, through the multipath effect h (n) of three paths.This signal after this three paths, due to the difference of path length, interval is identical respectively time order and function can arrive at receiving terminal 130.And the energy of this signal is propagated, so the energy that each paths is assigned to is approximately identical along this three paths fifty-fifty.In other words, not one transmit the highest predominating path of energy and other transmit the lower secondary path of energy.
Please refer to shown in Fig. 2 B, it is an actual amount mapping of the multipath effect of Fig. 2 A.In the middle of Fig. 2 B, have the energy peak of three projections, representation signal is in the propagation time in three different paths.
Generally traditional eqalizing cricuit 134 designs, and such as decision feedback equalizer (DFE, Decision Feedback Equalizer) can carry out the process of pulling over of feedback signal for received signal.If that receive is multipath effect h (n) as Fig. 2 A and Fig. 2 B, judge which paths is the predominating path that energy is maximum owing to having no idea, therefore the convergence time that adjusts required for parameter of eqalizing cricuit 134 is quite of a specified duration.
Please refer to shown in Fig. 3, it is the signal to noise ratio of eqalizing cricuit 134 under multipath effect shown in Fig. 2 A and Fig. 2 B and time diagram.From receiving the signal in Article 1 path, eqalizing cricuit just starts to carry out calculating of pulling over.But have no idea to judge which paths is the predominating path that energy is maximum, so the eqalizing cricuit time must taken more than one second the signal to noise ratio of output signal just can be made to rise to can the degree of later use.
For modern high-speed communications systems, change step if can must complete through so long convergence time to wait under multipath effect, be really difficult to make us acceptance.Therefore, need a kind ofly can overcome multipath effect and allow rapidly the output of eqalizing cricuit 134 have the apparatus and method of high s/n ratio, to make receiving terminal 130 Received signal strength soon.
Summary of the invention
According to an embodiment, the invention provides a kind of receiving system, be applied to the receiving terminal of a communicator, this communicator comprises first device.This receiving system comprises: a filter, carries out filtering to reduce its multipath effect, and export a filtered signal for a Received signal strength; And a channel estimation device, carry out channel estimation for this Received signal strength and produce an estimation result according to this, this estimation result is in order to determine to select one to be sent to this eqalizing cricuit in this Received signal strength and this filtered signal.
According to another embodiment, the invention provides a kind of method of reseptance, be applied to the receiving terminal of a communicator, this communicator comprises first device, this method of reseptance comprises the following step: carry out a filtering to reduce its multipath effect for a Received signal strength, and export a filtered signal; Carry out channel estimation for this Received signal strength and produce an estimation result according to this; And determine to select one to be sent to this eqalizing cricuit in this Received signal strength and this filtered signal according to this estimation result.
In order to have better understanding, special embodiment below to above-mentioned and other aspect of the present invention, and coordinating accompanying drawing, being described in detail below:
Accompanying drawing explanation
Fig. 1 is the model schematic of prior art to channels spread.
Fig. 2 A is that a generation for a certain multipath effect represents intention.
Fig. 2 B is an actual amount mapping of the multipath effect of Fig. 2 A.
Fig. 3 is the schematic diagram of the signal to noise ratio of eqalizing cricuit under multipath effect shown in Fig. 2 A and Fig. 2 B.
Fig. 4 A is a block schematic diagram of receiving terminal according to an embodiment of the invention.
Fig. 4 B is a block schematic diagram of receiving terminal according to another embodiment of the present invention.
Fig. 4 C is a block schematic diagram of receiving terminal according to another embodiment of the present invention.
Fig. 5 A is a block schematic diagram of receiving terminal according to another embodiment of the present invention.
Fig. 5 B is a block schematic diagram of receiving terminal according to another embodiment of the present invention.
Fig. 5 C is a block schematic diagram of the receiving terminal of another embodiment of the present invention.
Fig. 6 A is the block schematic diagram according to the present invention's more receiving terminal of an embodiment.
Fig. 6 B is the block schematic diagram according to the present invention's more receiving terminal of an embodiment.
Fig. 7 is a block schematic diagram of receiving terminal according to another embodiment of the present invention.
Fig. 8 A is an effect schematic diagram of filter according to an embodiment of the invention.
Fig. 8 B is another effect simulation figure of filter according to an embodiment of the invention.
Fig. 9 is a simulation schematic diagram of the signal to noise ratio of eqalizing cricuit according to an embodiment of the invention.
Figure 10 is the schematic flow sheet of a method of reseptance according to an embodiment of the invention.
Figure 11 is the schematic flow sheet of a method of reseptance according to another embodiment of the present invention.
Figure 12 is the schematic flow sheet according to the present invention's more method of reseptance of an embodiment.
Symbol description
110 transmission ends
120 passages
130 receiving terminals
132 channel estimation modules
134 eqalizing cricuits
430 receiving terminals
432 channel estimation modules
434 eqalizing cricuits
436 channel estimation modules
438 filters
440 selectors
538 tunable filters
638-1 ~ 638-m filter
738-1 ~ 738-2 filter
1010 ~ 1050 steps
1130 ~ 1150 steps
1230 ~ 1270 steps
Embodiment
It is as follows that the present invention will describe some embodiments in detail.But except disclosed embodiment, the embodiment that the present invention can also be used in other is widely implemented.Scope of the present invention by the restriction of these embodiments, is not be as the criterion with claim thereafter.Even and if for providing clearer description those of ordinary skill in the art can understand summary of the invention of the present invention, each several part in diagram is not drawn according to its relative size and ratio, the ratio regular meeting of some size and other scale dependents is seemed by highlighting and exaggerates, and incoherent detail section is not also drawn completely, in the hope of illustrated succinctly understandable.
In the model shown in Fig. 1, the digital signal that eqalizing cricuit 134 receives receives the impact of multipath effect, so be difficult to converge to the higher degree of signal to noise ratio at short notice.Therefore, one of feature of the present invention, is that the digital signal to eqalizing cricuit 134 receives first carries out filtering.Particularly first carry out filtering according to channel estimation result, with reduce eqalizing cricuit 134 the impact of multipath effect in reception digital signal, so eqalizing cricuit 134 just can reduce the time of convergence signal to noise ratio.Through above-mentioned inventive features, required convergence time just can reduce significantly.Below by describing through several embodiment, above-mentioned inventive features is described.
Please refer to shown in Fig. 4 A, it is a block schematic diagram of the receiving terminal 430 of one embodiment of the invention.Compared with the schematic diagram of Fig. 1, the embodiment shown in Fig. 4 A has a channel estimation module 432 and first device 434 equally.With the prior art of Fig. 1 unlike, had before eqalizing cricuit 434 channel estimation module 436, filter 438, with a selector 440.Wherein this selector 440 can comprise two input signals, that is the output signal z (n) of signal y (n) that receives of receiving terminal 430 and filter 438.The channel estimation result that signal y (n) that this selector 440 can receive according to this channel estimation module 436 pairs of receiving terminals does, in above-mentioned two input signals y (n) with z (n), one of them is selected to be input to eqalizing cricuit 434 and channel estimation module 432.The estimation result that this channel estimation module 436 exports has the degree about multipath effect.
This filter 440 impact on signal is designated as p (n).In one embodiment, the effect of this filter widens the capacity volume variance in this Received signal strength between one first path signal and one second path signal.Therefore, signal y (n) received when receiving terminal 430, after above-mentioned filter 438, on the integral passage impact of eqalizing cricuit 434 can be
, wherein
that represent is linear convolution (linear convolution).In one embodiment, when the channel estimation result of channel estimation module 436 indicates multipath effect, selector 440 will select input signal z (n), and be exported.Easy speech it, signal y (n) is device 438 after filtering, and become signal z (n) after filtration when delivering to eqalizing cricuit 434, the situation of multipath effect will be enhanced.For example there is the predominating path that a peak value is higher, the convergence rate of eqalizing cricuit 434 is accelerated many.
But, be not that every subchannel 120 all can occur multipath effect h (n), or multipath effect is not so obvious.In another embodiment, when the channel estimation result of channel estimation module 436 represent there is no multipath effect time, or when the degree of multipath effect is less than a threshold value, selector 440 will select input signal y (n), and be sent to eqalizing cricuit 434.In a more embodiment, for example, if only have two paths, the signal energy transmitted via predominating path is more much higher than the signal energy of secondary path, and so eqalizing cricuit 434 also can restrain its signal to noise ratio soon.When above-mentioned, when the channel estimation result of channel estimation module 436 represents the filtering not needing filter 438, selector 440 also will select input signal y (n), and be sent to eqalizing cricuit 434.
In other words, the channel estimation module 436 that the receiving terminal 430 of Fig. 4 A comprises is responsible for carrying out signal y (n) that receiving terminal 430 receives the estimation of passage.When this channel estimation module 436 thinks that multipath effect h (n) acquires a certain degree above, make received signal y (n) revise through filter 438, after obtaining signal z (n), enter eqalizing cricuit 434 again.Otherwise, make received signal y (n) skip filter 438 and directly enter eqalizing cricuit 434.
Please refer to shown in Fig. 4 B, it is a block schematic diagram of the receiving terminal 430 of one embodiment of the invention.Compared with Fig. 4 A, before filter 438 has been changed in the position of selector 440.According to the estimation result of channel estimation module 436, input signal y (n) is optionally outputted to eqalizing cricuit 434 or filter 438 by selector 440.Suppose that estimation result thinks that eqalizing cricuit 434 needs the help of filter 438, then input signal y (n) can be outputted to filter 438 by selector 440, so eqalizing cricuit 434 and channel estimation module 432 will receive filtered signal z (n).Suppose that estimation result thinks that the degree of multipath effect is not serious, then input signal y (n) can directly be outputted to eqalizing cricuit 434 and channel estimation module 432 by selector 440, equals to close filter 438.
Please refer to shown in Fig. 4 C, it is a block schematic diagram of the receiving terminal 430 of one embodiment of the invention.With Fig. 4 A compared with Fig. 4 B, the receiving terminal 430 shown in Fig. 4 C can not comprise above-mentioned selector 440.Its channel estimation result is sent to filter 438 by channel estimation module 436.This filter 438 directly exports signal y (n) of non-filtered or signal z (n) after filtering to eqalizing cricuit 434 and another channel estimation module 432 according to channel estimation result.In another example, its filter effect is adjusted to from p (n) by the channel estimation result that this filter 438 also can export according to channel estimation module 436 does not carry out filtering.In other words, the possibility of result that this filter 438 exports is signal y (n) or signal z (n) after filtering of non-filtered.
Channel estimation module 432 estimates filtered signal z (n) of filter 438, or directly estimate received signal y (n).The purposes of this channel estimation module 432 is then suitable with the Properties and effect of the channel estimation module 132 shown in Fig. 1, therefore does not add detailed description at this.
Please refer to shown in Fig. 8 A, it is an effect schematic diagram of filter according to an embodiment of the invention.In the middle of Fig. 8 A, the multipath effect h (n) that passage 120 has is suitable with the multipath effect h (n) of Fig. 2 A.Signal is propagated in the middle of passage 120 through three different paths, and signal is all suitable in the Propagation of Energy of every paths.
In this embodiment, filter effect p (n) of filter 438 is set as the peak value maintaining previous moment, and weakens the peak value in a rear moment.In other words, its filter effect by be used for keeping having multipath effect this digital signal in the middle of, the digital signal of the first via received at first, and weaken the digital signal of this first via non-.Or can say, the effect of filter 438 is to widen the capacity volume variance in this Received signal strength between one first path signal and one second path signal.Therefore, the signal first arrived in signal y (n) will maintain its energy, and the signal energy in two paths arrived after a while will weaken.For signal x (n) that transmission end is transmitted, through the impact of multipath effect h (n) and filter effect p (n), affecting q (n) by being equal to through integral passage, finally becoming signal z (n).Compared with the primary signal y (n) without filtering p (n), although signal z (n) is also have three paths, a predominating path and two secondary path can be separated.
Please refer to shown in Fig. 8 B, it is another effect simulation figure of filter according to an embodiment of the invention.Please also refer to Fig. 8 A, signal x (n) is through the impact of multipath effect h (n) and filter effect p (n), being equal to affects q (n) through integral passage, therefore it through filtered signal as shown in Figure 8 B, presents the higher predominating path of peak value and two secondary path.
Refer again to shown in Fig. 9, it is signal to noise ratio and the time diagram of the output signal of eqalizing cricuit 434 according to an embodiment of the invention.Compare with the signal to noise ratio of the output signal of the eqalizing cricuit 134 of Fig. 3 prior art and time diagram, clearly can find out that eqalizing cricuit 434 just restrains its signal to noise ratio in a short period of time.Accordingly, receiving terminal 430 can obtain the signal possessing enough high s/n ratios soon according to an embodiment of the invention, and carries out follow-up decipher work.
Those having ordinary skill in the art will appreciate that, although the multipath effect h (n) that the present invention enumerates is using the path of three suitable energy as example, the form of multipath effect does not only have one, has very many changes.For example, the path of the path of two suitable energy or four suitable energy, all belongs to multipath effect.
Those of ordinary skill in the art is also appreciated that, filter effect p (n) of the filter 438 that the present invention enumerates does not only have the one in the middle of Fig. 8 A.For example, except weakening except signal peak in the place of 1us, also signal peak can be weakened in the place of 2us.Or be weaken signal peak in the place of 0us, maintain signal peak in the place of 1us.
Change due to multipath effect is infinite, and the change of filter filtering effect is also infinite, and the change after being multiplied therefore is also infinite.For multipath effect miscellaneous, receiving terminal 430 can adopt the filter 438 of multiple kenel to be dealt with.
Please refer to shown in Fig. 5 A, it is a block schematic diagram of a receiving terminal 430 of another embodiment of the present invention.Compared with the receiving terminal 430 of Fig. 4 A, the filter 438 that difference is originally to have fixing filter effect has changed the tunable filter 538 of variable filter effect into.Signal y (n) that receiving terminal 430 receives is after the estimation of channel estimation module 436, and tunable filter 538 is according to the result of estimation, that is the degree of multipath effect, adjusts filter effect p (n) accordingly.As mentioned above, because the change of multipath effect and filter effect is all infinite, and the change of filter effect is not emphasis of the present invention, does not therefore add detailed description.
Please refer to shown in Fig. 5 B, it is a block schematic diagram of a receiving terminal 430 of another embodiment of the present invention.Compared with the receiving terminal 430 of Fig. 5 A, difference is that the position of selector 440 is from before having changed to tunable filter 538 after tunable filter 538.Compared with the receiving terminal 430 of Fig. 4 B, the filter 438 that difference is originally to have fixing filter effect has changed the tunable filter 538 of variable filter effect into.According to the estimation result of channel estimation module 436, input signal y (n) is optionally outputted to eqalizing cricuit 434 or filter 438 by selector 440.Suppose that estimation result thinks that eqalizing cricuit 434 needs the help of tunable filter 538, then input signal y (n) can be outputted to tunable filter 538 by selector 440, so eqalizing cricuit 434 and channel estimation module 432 will receive filtered signal z (n).Suppose that estimation result thinks that the degree of multipath effect is not serious, then input signal y (n) can directly be outputted to eqalizing cricuit 434 and channel estimation module 432 by selector 440, equals to close tunable filter 538.Tunable filter 538 is according to the result of estimation, that is the degree of multipath effect, adjusts filter effect p (n) accordingly.
Please refer to shown in Fig. 5 C, it is a block schematic diagram of a receiving terminal 430 of another embodiment of the present invention.Compared with the receiving terminal 430 of Fig. 4 C, the filter 438 that difference is originally to have fixing filter effect has changed the tunable filter 538 of variable filter effect into.Signal y (n) that receiving terminal 430 receives is after the estimation of channel estimation module 436, and tunable filter 538, according to the result of estimation, adjusts filter effect p (n) accordingly.And the filter 438 shown in Fig. 4 B only has filter effect p (n) and zero filter effect two kinds, except these two kinds, filter effect p (n) of tunable filter 538 is adjustable.
Please refer to shown in Fig. 6 A, it is a block schematic diagram of the present invention's more receiving terminal 430 of an embodiment.In the middle of the embodiment of Fig. 5 A, although tunable filter 538 can deal with the multipath effect of more kenel, the design of tunable filter 538 may be too complicated, might not be applicable on each application.Therefore, in the middle of Fig. 6 A illustrated embodiment, use multiple (as m) filter 638-1 ~ 638-m to be connected to receiving end signal y (n) of receiver 430 abreast.The output of these filters 638-1 ~ 638-m can be connected to the input of a selector 440.In the present embodiment, the output signal of first filter 638-1 is z1 (n), the output signal of second filter 638-2 is z2 (n).The rest may be inferred, and the output signal of m filter 638-m is zm (n).
The filtering performance of each filter 638-1 ~ 638-m is not identical, when channel estimation module 436 pairs of receiving end signals y (n) are estimated, can estimate the multipath effect h (n) in the middle of passage 120.According to estimation result out, selector 640 can be made to select the filtering of one of them filter 638-1 ~ 638-m to output to eqalizing cricuit 434 and another channel estimation module 432.
In the middle of the embodiment of Fig. 6 A, these filter 638-1 ~ 638-m with fixing filtering performance have preferably filter effect respectively for the multipath effect of different kenel.Make its output signal make eqalizing cricuit 434 can converge to soon signal to noise ratio can state.
Please refer to shown in Fig. 6 B, it is a block schematic diagram of the present invention's more receiving terminal 430 of an embodiment.Be with the embodiment difference shown in Fig. 6 A, the position of selector 440 is from before having changed to multiple filter 638-1 ~ 638-m after multiple filter 638-1 ~ 638-m.According to channel estimation result, selector 440 can select optimal filter in the middle of multiple filter 638-1 ~ 638-m, received signal y (n) is delivered to this optimal filter.Or directly received signal y (n) is delivered to eqalizing cricuit 434 and channel estimation module 432.
Please refer to shown in Fig. 7, it is a block schematic diagram of a receiving terminal 430 of another embodiment of the present invention for it.Compared with the parallel connection of Fig. 6, multiple filter 738-1 ~ 738-2 of Fig. 7 embodiment use the mode of serial connection.The filtering performance of these filters 738-1 ~ 738-2 can not be identical, also can be identical.The output of filter 738-1 is connected to an input of selector 640, and the input of another filter 738-2.And the output of filter 738-2 is connected to another input of selector 640.
In other words, three inputs of selector 640 are filter result z2 (n) after receiving terminal 430 signal y (n), filter result z1 (n) of filter 738-1 and the filter 738-1 that receive and filter 738-2 linear convolution respectively.Identical with Fig. 6, when channel estimation module 436 pairs of receiving end signals y (n) are estimated, the multipath effect h (n) in the middle of passage 120 can be estimated.According to estimation result out, selector 640 can be made to select one of them input to output to eqalizing cricuit 434 and another channel estimation module 432.Although only illustrate two filter 738-1 and 738-2 be connected in series in the figure 7, the present invention does not limit the filter quantity of serial connection.
The embodiment of complex chart 5A to Fig. 7, receiving terminal 430 can use the filter of single fixing filter effect, also can use the filter of single adjustable filter effect or use multiple filter.When receiving terminal 430 uses multiple filter, these filters can be Received signal strength y (n) abreast, or Received signal strength y (n) after serial connection, press down or are parallel and serial connection ground Received signal strength y (n).The selector that the multiple filter of receipt of subsequent exports, then according to the tunnel condition that channel estimation module 436 is estimated, the particularly situation of multipath effect h (n), selects suitable filter, restrains its signal to noise ratio exported soon to available degree in order to follow-up eqalizing cricuit 434.
Those having ordinary skill in the art will appreciate that, these embodiments can support one of key character of the present invention.Namely first filtering is carried out to the digital signal that eqalizing cricuit receives.Particularly first carry out filtering according to channel estimation result, make eqalizing cricuit receive the multipath effect in digital signal so large unlike script digital signal of impact, so eqalizing cricuit just can reduce the time of the signal to noise ratio of its output of convergence.Through above-mentioned inventive features, required convergence time just can reduce significantly.
Please refer to shown in Figure 10, it is the schematic flow sheet of a method of reseptance according to an embodiment of the invention.The method of reseptance that this figure discloses, goes for receiving terminal.Those of ordinary skill in the art can with reference to the embodiment shown in Fig. 4 A.First in step 1010, a digital signal is received.Here the digital signal of indication can be signal y (n) shown in Fig. 4 A.Then, in the middle of step 1020, carry out channel estimation to received digital signal, whether estimation has the distortion through multipath effect in the channel.
Then according to step 1020 the result estimating out, in the middle of determining step 1030, judge whether this passage meets the first estimation situation.Here the first estimation situation of indication, what refer to can be the multipath effect of a certain type.If step 1030 judges that passage meets the first estimation situation really, then method of reseptance proceeds to step 1040.In the middle of this step 1040, according to the first estimation situation, the first filter step is carried out to received digital signal.When having carried out the output after the first filter step, can then carry out step 1050 such as grade.Accordingly, step 1050 such as grade can restrain the higher output signal of signal to noise ratio quickly.Suppose step 1030 judge this passage meet first estimation situation, then method of reseptance proceed to wait change step 1050.This step 1050 is allowed directly to carry out grade to received digital signal.
Implement in example at one of the present embodiment, the first above-mentioned estimation situation is not the multipath effect situation singly referring to a certain type, refers to the multipath effect situation of some type.Estimate when step 1020 and the multipath effect situation that passage is these types, then step 1040 utilizes the first filter step of adjustable effect to carry out the multipath effect situation of these classifications corresponding.Those of ordinary skill in the art can with reference to the embodiment shown in Fig. 5.
Please refer to shown in Figure 11, it is the schematic flow sheet of a method of reseptance of another embodiment of the present invention.Those of ordinary skill in the art can with reference to the embodiment shown in Fig. 6 A.Compared with the embodiment shown in Figure 10, after step 1020 pair passage is estimated, proceed to step 1130.Judge which kind of estimation situation this passage meets.Suppose to meet the first estimation situation, then method of reseptance proceeds to step 1140, carries out the first filter step for received signal.Suppose that this passage meets the second estimation situation, then method of reseptance proceeds to step 1150.The second filter step is carried out for received signal.
Those having ordinary skill in the art will appreciate that, in the middle of the embodiment shown in Figure 11, step 1140 is different from the filter effect of step 1150, and it corresponds to different estimation situations.In addition, step 1140 and step 1150 also can be carried out simultaneously, then select in step 1050 a certain step 1140 or 1150 filtering export changes such as carrying out.Similarly, suppose that step 1130 judges that passage does not meet first and second estimation situation, then can be general with the embodiment shown in Figure 10, step 1050 such as grade directly carries out grade to received digital signal.
Please refer to shown in Figure 12, it is the schematic flow sheet of a method of reseptance of another embodiment of the present invention.Those of ordinary skill in the art can with reference to the embodiment shown in Fig. 7.Compared with the method for reseptance shown in Figure 11, difference embodiment illustrated in fig. 12 be in, except meet first estimation situation under carry out the first filter step 1240, meet second estimation situation under carry out except the second filter step 1250.Under supposing that passage meets the 3rd estimation situation, then can first carry out the 3rd filter step 1260.Then, the 4th filter step 1270 is again for the filtering that the output of the 3rd filter step 1260 is carried out again.Output signal after twice filtering to be delivered to etc. again and is changed step 1050 and carry out grade.
In the embodiment shown in fig. 12,3rd filter step 1260 can equal the first filter step the 1240, four filter step 1270 can equal the second filter step 1250, in other words, the filter step of two filter effects can be utilized, meet three kinds of different estimation situations.Suppose filter step A, B, C of there being three kinds of different filter effects, then can correspond to a situation, b situation, c situation, ab situation, bc situation, ac situation and abc situation that channel estimation goes out.Those of ordinary skill in the art can know by inference easily, use the parallel of the filter step of various filter effect and are connected in series, and can tackle many different channel estimation situations.
The foregoing is only preferred embodiment of the present invention, and be not used to limit claim of the present invention.All other change for the equivalence completed under meeting disclosed spirit or modify, within the sharp scope that all should be included in claims application.
Claims (17)
1. a receiving system, is applied to the receiving terminal of a communicator, and this communicator comprises first device, and this receiving system comprises:
One filter, carries out filtering to reduce its multipath effect for a Received signal strength, and exports a filtered signal; And
One channel estimation device, carry out channel estimation for this Received signal strength and produce an estimation result according to this, this estimation result is to determine to select one to be sent to this eqalizing cricuit in this Received signal strength and this filtered signal.
2. receiving system as claimed in claim 1, is characterized in that, the speed that this filtered signal makes this eqalizing cricuit carry out process such as gradeization is accelerated.
3. receiving system as claimed in claim 1, it is characterized in that, the filtering parameter of this filter adjusts according to this estimation result.
4. receiving system as claimed in claim 1, is characterized in that, also comprise:
One selector, selects one to be sent to this eqalizing cricuit according to this estimation result in this Received signal strength and this filtered signal.
5. receiving system as claimed in claim 1, is characterized in that, also comprise:
Another filter, carry out filtering to reduce its multipath effect for this Received signal strength, and export another filtered signal, wherein the filtering parameter of this another filter is different with the filtering parameter of this filter; And
One selector, selects one to be sent to this eqalizing cricuit according to this estimation result in this filtered signal and this another filtered signal.
6. receiving system as claimed in claim 1, is characterized in that, also comprise:
Another filter, carries out filtering to reduce its multipath effect for this filtered signal.
7. receiving system as claimed in claim 1, it is characterized in that, this estimation result has the degree about a multipath effect.
8. receiving system as claimed in claim 7, is characterized in that, when this estimation result represents that the degree of this multipath effect is less than a threshold value, it is front without filtering process that this channel estimation device makes this Received signal strength be sent to this eqalizing cricuit.
9. receiving system as claimed in claim 1, it is characterized in that, this filter is in order to widen the capacity volume variance in this Received signal strength between one first path signal and one second path signal.
10. a method of reseptance, is applied to the receiving terminal of a communicator, and this communicator comprises first device, and this method of reseptance comprises:
Carry out a filtering to reduce its multipath effect for a Received signal strength, and export a filtered signal;
Carry out channel estimation for this Received signal strength and produce an estimation result according to this; And
Determine to select one to be sent to this eqalizing cricuit in this Received signal strength and this filtered signal according to this estimation result.
11. method of reseptances as claimed in claim 10, is characterized in that, the speed that this filtered signal makes this eqalizing cricuit carry out process such as gradeization is accelerated.
12. method of reseptances as claimed in claim 10, is characterized in that, carry out a filtering to reduce the step of its multipath effect for a Received signal strength, and its filtering parameter carrying out this filtering adjusts according to this estimation result.
13. method of reseptances as claimed in claim 10, is characterized in that, also comprise:
Carry out another filtering to reduce its multipath effect for this Received signal strength, and export another filtered signal, wherein the filtering parameter of this another filtering of filtering and this is different; And
In this filtered signal and this another filtered signal, one is selected to be sent to this eqalizing cricuit according to this estimation result.
14., as the method for reseptance of claim 10, is characterized in that, also comprise:
Another filtering is carried out to reduce its multipath effect for this filtered signal.
15. method of reseptances as claimed in claim 10, it is characterized in that, this estimation result has the degree about a multipath effect.
16. method of reseptances as claimed in claim 15, is characterized in that, when this estimation result represents that the degree of this multipath effect is less than a threshold value, make this Received signal strength be sent to this eqalizing cricuit front without filtering process.
17. method of reseptances as claimed in claim 10, is characterized in that, this filtering is in order to widen the capacity volume variance in this Received signal strength between one first path signal and one second path signal.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040042545A1 (en) * | 2002-08-28 | 2004-03-04 | Samsung Electronics Co., Ltd. | Equalizer of single carrier receiver for improving equalization speed and equalization method thereof |
| US20050129106A1 (en) * | 2003-12-10 | 2005-06-16 | Nec Corporation | Equalizer and method of setting initial value for same |
| CN101116299A (en) * | 2005-02-11 | 2008-01-30 | Ttpcom有限公司 | Conditioning equaliser input |
| CN101359926A (en) * | 2007-07-31 | 2009-02-04 | 华为技术有限公司 | Receiver, channel estimation method and apparatus |
| CN102299873A (en) * | 2010-06-24 | 2011-12-28 | 创锐讯通讯技术（上海）有限公司 | Physical layer chip in EOC (Ethernet Over Coax) network and realization method thereof |
-
2013
- 2013-06-14 CN CN201310236626.8A patent/CN104243367B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040042545A1 (en) * | 2002-08-28 | 2004-03-04 | Samsung Electronics Co., Ltd. | Equalizer of single carrier receiver for improving equalization speed and equalization method thereof |
| US20050129106A1 (en) * | 2003-12-10 | 2005-06-16 | Nec Corporation | Equalizer and method of setting initial value for same |
| CN101116299A (en) * | 2005-02-11 | 2008-01-30 | Ttpcom有限公司 | Conditioning equaliser input |
| CN101359926A (en) * | 2007-07-31 | 2009-02-04 | 华为技术有限公司 | Receiver, channel estimation method and apparatus |
| CN102299873A (en) * | 2010-06-24 | 2011-12-28 | 创锐讯通讯技术（上海）有限公司 | Physical layer chip in EOC (Ethernet Over Coax) network and realization method thereof |
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