CN106921598A - Equalizing device and its soft decision method - Google Patents
Equalizing device and its soft decision method Download PDFInfo
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- CN106921598A CN106921598A CN201511000453.5A CN201511000453A CN106921598A CN 106921598 A CN106921598 A CN 106921598A CN 201511000453 A CN201511000453 A CN 201511000453A CN 106921598 A CN106921598 A CN 106921598A
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- soft decision
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- interval
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
- H04L25/03248—Arrangements for operating in conjunction with other apparatus
- H04L25/03254—Operation with other circuitry for removing intersymbol interference
- H04L25/03267—Operation with other circuitry for removing intersymbol interference with decision feedback equalisers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The present invention provides a kind of equalizing device, the equalizing device includes feedforward control wave filter, soft decision circuit and feedback wave filter, feedforward control wave filter is used to process an input signal, soft decision circuit is to feedforward control according to the output signal of feedforward control wave filter and the feedback signal of feedback wave filter, soft decision operation is performed to produce result of decision signal, feedback wave filter to be used to produce feedback signal according to result of decision signal.
Description
Technical field
The present invention is on a kind of balanced device mechanism, espespecially a kind of equalizing device and corresponding soft decision method.
Background technology
In general, the equaliser architecture of the receiving terminal of conventional communication system uses hard decision mechanism
(hard decision), the hard decision mechanism system judges received signal for which by a decision boundary
One symbol simultaneously exports corresponding signal level, but hard decision mechanism has the shortcomings that its is serious, when once
During generation decision error (such as because interchannel noise is excessive or multipath attenuation effect), the amount of error of erroneous judgement
It is accumulative can be more and have influence on follow-up decision-making, this causes whole system to be easier to collapse and unstable.
The content of the invention
Therefore, an object of the present invention is to provide a kind of equalizing device of soft decision and corresponding of performing
Soft decision method, once cause the amount of error of decision error excessive using hard decision mechanism to solve tradition
Problem.
Embodiments in accordance with the present invention, it discloses a kind of equalizing device, and the equalizing device includes feedforward
Control wave filter, soft decision circuit and feedback wave filter, feedforward control wave filter are used to process an input signal,
Soft decision circuit is to feedforward control according to the output signal of feedforward control wave filter and returning for feedback wave filter
Credit number, performs soft decision operation to produce result of decision signal, feedback wave filter to be used to according to the result of decision
Signal produces feedback signal.
Embodiments in accordance with the present invention, separately disclose a kind of soft decision method operated in the equalizing device,
The soft decision method includes：Using feedforward control wave filter, an input signal is processed；Feedforward control according to
The output signal of feedforward control wave filter and the feedback signal of feedback wave filter, perform soft decision operation to produce
Result of decision signal；And feedback wave filter is used, feedback signal is produced according to result of decision signal.
Brief description of the drawings
Fig. 1 is the conceptual schematic view of the communication system of the embodiment of the present invention.
Fig. 2 is that an implementation of the interior equalizing device positioned at signal receiving end of communication system shown in Fig. 1 is illustrated
It is intended to.
Fig. 3 is the constellation figure and 16 schematic diagrames of constellation point of 16-QAM quadrature carrier amplitude modulations.
Fig. 4 is the schematic diagram of the embodiment that this case performs soft decision operation.
Symbol description
100 communication systems
105 conveyers
110 channels
115 receivers
120 channel estimation circuits
125 equalizing devices
130 decoding circuits
302nd, the constellation point of 401A, 401B, 401C, 401D 16-QAM
402A, 402B, 402C decision boundary
403A, 403B, 403C soft decision are interval
The location point of 302A, 302B signal z (n)
1051 coding circuits
1251 feedforward control wave filters
1252 soft decision circuits
1253 feedback wave filters
Specific embodiment
Fig. 1 is refer to, Fig. 1 is the conceptual schematic view of the communication system 100 of the embodiment of the present invention.Communication system
System 100 includes conveyer 105, channel 110 and receiver 115, and receiver 115 includes channel estimating electricity
Road 120, equalizing device 125, decoding circuit 130, conveyer 105 is using 1051 pairs of letters of coding circuit
After information signal x (n) carries out coding protection (such as forward error more code can be used to encode) to produce coding
Signal y (n), transmission coded signal y (n) to channel 110, signal y (n) is subject to the multipath of channel 110
Weak effect (multipath fading, be expressed as h (n)) and additional noise w (n) are influenceed, and are received
The signal of the actual received of device 115 is z (n), because the complexity of the weak phenomenon of multipath is (in radio communication
It is especially serious in environment), it is impossible to it is directly based upon signal z (n) to obtain information signal x (n), thus uses letter
Road estimation circuit 120 carries out channel estimating according to signal z (n) to estimate channel impulse response (channel
Impulse response), output channel estimation results are to equalizing device 125, equalizing device 125
The response that the weak phenomenon of multipath is carried out to signal z (n) according to the channel estimation results is compensated to reduce transmission mistake
Rate, the signal after 130 pairs of compensation of decoding circuit afterwards is decoded (such as decoding of forward error more code)
To produce or reply decoded information signal x ' (n).The embodiment of this case is adopted in lying in equalizing device 125
With soft decision method (soft decision), when making to carry out feedback response compensation, traditional hard decision mechanism is reduced
Error propagation problems (error propagation), it is to avoid cause more when certain hard decision mistake
Error propagation is influenceed to decision-making next time, therefore compared to hard decision mechanism, this case uses soft decision method
Equalizing device 125 have stability higher, while also can lifting system decision-making efficiency.
Fig. 2 is refer to, Fig. 2 is the interior balanced device positioned at signal receiving end of communication system 100 shown in Fig. 1
One embodiment schematic diagram of device 125, the equalizing device 125 of this case uses the equal of decision-making feedback
Weighing apparatus framework (decision feedback equalizer), it is applicable in various communication architectures, for example, have
Line DVB (Digital Video Broadcast over Cable, abbreviation DVB-C), the U.S.
Advanced television system committee (Advanced Television System Committee, abbreviation ATSC),
T-DMB (Terrestrial Multimedia Broadcast, abbreviation DTMB) etc..
Equalizing device 125 includes feedforward control wave filter (feedforward filter) 1251, soft decision circuit (soft
Slicer) 1252 and feedback wave filter 1253, feedforward control wave filter 1251 is used to receive and process self-channel
110 signals z (n) for actually receiving, signal z (n) is ideally corresponding to the symbol after a modulation of transmission end
Signal and be subject to that multipath is weak and influence of noise when transmission, such as symbol can be transmission end via
Produced by the quadrature carrier amplitude modulation of 16-QAM, and the signal level of signal z (n) can ideally correspond to
The amplitude size of the quadrature carrier amplitude of the symbol signal after the modulation.Before soft decision circuit 1252 is coupled to
The output end and being used to of feedback control wave filter 1251 receives the output signal of feedforward control wave filter 1251 (also
I.e. via feedforward control wave filter 1251 process after signal z ' (n)) and feedback wave filter 1253 feedback
Signal fb, the feedback of output signal z ' (n) and feedback wave filter 1253 according to feedforward control wave filter 1251
Signal fb, performs soft decision operation to produce a result of decision signal sd, and in implementation, signal z ' (n) can be detained
Soft decision circuit 1252 is resent to after falling feedback signal fb, the input signal of soft decision circuit 1252 is constituted
(that is, z ' (n)-fb), or soft decision circuit 1252 can first receive signal z ' (n) and feedback signal fb, profit
Signal z ' (n) is deducted into feedback signal fb with its internal circuit running and performs soft decision operation again.Feedback is filtered
Device 1253 is coupled to the output end of soft decision circuit 1252 and to be produced back according to result of decision signal sd
Credit fb is to soft decision circuit 1252, for example, soft decision circuit 1252 is filtered according to via feedforward control
The actual signal amplitude of signal z ' (n) after the treatment of device 1251 and the level of feedback signal fb, judge signal z (n)
Why is corresponding symbol signal, exports the ideally corresponding quadrature carrier amplitude size of the symbol signal.
It is noted that the equalizing device 125 of this case is applicable to different modulation schemes, not only it is defined in
The quadrature carrier amplitude modulation of 16-QAM.
Fig. 3 is refer to, Fig. 3 is the constellation figure and 16 stars of 16-QAM quadrature carrier amplitude modulations
The schematic diagram of seat point, 16-QAM modulations are to transmit information/data in the amplitude modulation mode of two quadrature carriers,
Signal mathematically represents two different quadrature carriers in the form of I+jQ, as shown in figure 3, I axle generations
The real number axis of table planisphere, Q axles represent axis of imaginaries, and 16 constellation points of candidate's symbol are formed on planisphere,
The location point of the actual ideal amplitude size for receiving signal z (n) should fall wherein a constellation point, however, by
The influence with noise weak in multipath, the location point reality of the signal amplitude on the quadrature carrier of signal z (n)
On not necessarily fall the position of in 16 constellation points certain constellation point, and certain constellation point may be located at
Nearby (if multipath is weak smaller with noise influence), or positioned at two centres of constellation point (if
Multipath is weak excessive with noise influence), the dotted line in Fig. 3 indicates the decision boundary of each constellation point
(decision boundary), if signal amplitude (or level) on the I axles of signal z (n), Q axles
The relatively close a certain constellation point of location point, the then meeting of soft decision circuit 1252 of the equalizing device 100 of this case
The signal amplitude for judging or correcting the I axles of signal z (n), the signal amplitude of Q axles as the constellation point is reached,
Additionally, in order to avoid the problem of the propagation that makes a mistake, when soft decision circuit 1252 detects signal z (n)
The location point of signal amplitude is located at the vicinity of decision boundary, and soft decision circuit 1252 can perform the soft of adaptability
Decision-making mechanism, does not now judge or is modified to the signal of a certain neighbouring constellation point by the signal amplitude of signal z (n)
Amplitude, but produce and export a soft decision consequential signal to feedback wave filter 1253, to avoid error propagation
Phenomenon, if for example, the signal amplitude of signal z (n) be located at 302A location point, soft decision circuit 1252
Can reach judge or correct the signal amplitude of signal z (n) as hithermost constellation point 302 amplitude (that is,), and if the location point (such as 302B) of signal z (n) is extremely close to decision boundary, then
Soft decision circuit 1252 will not be judged or be modified to the amplitude of constellation point 302, and make into produce output
Signal level/the amplitude different from each constellation point position；Practical operation refer to Fig. 4.
Fig. 4 is the schematic diagram of the embodiment that this case performs soft decision operation.As shown in figure 4, transverse axis can be with
Represent real number axis I axles and/or axis of imaginaries Q axles, depicted on figure 4 constellation points 401A, 401B, 401C,
401D and corresponding 3 decision boundaries 402A, 402B, 402C, any decision boundary are arranged at two stars
The centre of seat point, for each decision boundary, it is soft certainly that soft decision circuit 1252 is provided with corresponding one
Plan is interval (signal level is interval), such as soft decision interval 403A, 403B, 403C, decision boundary
Positioned at the centre that soft decision is interval, in implementation, soft decision circuit 1252 in perform when soft decision is operated system by
The location point of (z ' (n)-fb) is combined with the signal of feedback signal fb by judgement signal z ' (n), to reach judgement
The location point of the signal amplitude (or level) on the I axles of signal z (n), Q axles, judges via feedforward control
Wave filter 1251 treatment after signal z ' (n) subtract the signal after feedback signal fb combination signal amplitude whether
Fall into the interval of the soft decision corresponding to a decision boundary to produce result of decision signal, for example, judge letter
Number amplitude whether fall into soft decision corresponding to decision boundary 402A it is interval in 403A, work as signal amplitude
When falling into soft decision interval 403A, soft decision circuit 1252 is produced and exports institute in the 403A of soft decision interval
A corresponding signal level as the result of decision signal, conversely, when outside the 403A of soft decision interval,
Soft decision circuit 1252 is produced and exports a corresponding neighbor candidate symbol (that is, neighbouring constellation point)
One carrier amplitude level as the result of decision signal, with implementation from the point of view of, when signal amplitude falls into soft decision area
Between 403A when, the exportable soft decision circuit 1252 of soft decision circuit 1252 input signal level (that is,
Signal z ' (n) after the treatment of feedforward control wave filter 1251 subtracts the result of feedback signal fb) as decision-making knot
Fruit signal sd to feedback wave filter 1253, in addition, in other implementations, when signal amplitude fall into it is soft certainly
During the 403A of plan interval, soft decision circuit 1252 can also be changed to export the center of soft decision interval 403A
A corresponding signal level is exported corresponding to decision boundary 402A as result of decision signal sd
Signal amplitude level (that is,) as result of decision signal sd.And if signal amplitude is located at soft decision
Interval 403A is outer and during closer constellation point 401A, soft decision circuit 1252 is produced and exports one and neighbouring waits
Select symbol (symbol corresponding to constellation point 401A) a carrier amplitude level (that is,) as decision-making
Consequential signal sd, whereas if during closer constellation point 401B, soft decision circuit 1252 is produced and defeated
Go out a neighbor candidate symbol (symbol corresponding to constellation point 401B) a carrier amplitude level (that is,) make
It is result of decision signal sd.Soft decision circuit 1252 is interval with corresponding soft decision for other decision boundaries
Judgement operation it is same as described above, repeat no more.
Also, it is noted that soft decision circuit 1252 using above-mentioned soft decision interval 403A, 403B,
During 403C, can be prior to the operation of the transverse axis (real number axis I axles) of planisphere execution soft decision, then according to real number
The soft decision result of axle I axles performs soft decision operation in the longitudinal axis (axis of imaginaries Q axles), to produce the result of decision
Signal sd, or also can prior to planisphere the longitudinal axis (axis of imaginaries Q axles) perform soft decision operation, then
Soft decision result according to axis of imaginaries Q axles performs soft decision operation in transverse axis (real number axis I axles), to produce
Result of decision signal sd, or also can simultaneously in the transverse axis (real number axis I axles) and the longitudinal axis (imaginary number of planisphere
Axle Q axles) soft decision operation is performed, to produce result of decision signal sd；Implement modification above and belong to this case
Category.
Therefore, in contrast, once when traditional hard decision mechanism decision error, such as will should correspond to
Carrier amplitude level isSymbol be mistaken for amplitude level and beSymbol when, its mistake for causing of erroneous judgement
Amount hasAdditionally, traditional hard decision mechanism be will also result in when erroneous judgement feedback wave filter cannot suitably start,
Furthermore, accumulative being also likely to result in of amount of error mistakenly have updated balanced device parameter in itself., whereas if
Using the soft decision method of the equalizing device 125 of this case, the probability that symbol erroneous judgement occurs can be reduced, and be
Making to judge its amount of error by accident can be as little asThus system effectiveness can be lifted.In this way, through this case
The interval design of soft decision judges that the equalizing device 125 of this case carries out the feedback response of soft decision with decision-making
More error propagations are caused to influence to decision-making next time once generation decision error can be avoided or mitigated during compensation
Error propagation problems, system has high stability, without being sent out because the weak influence of multipath is excessive
Raw collapse.
The foregoing is only presently preferred embodiments of the present invention, all impartial changes done according to the claims in the present invention
With modification, should all belong to covering scope of the invention.
Claims (14)
1. a kind of equalizing device, includes：
One feedforward control wave filter, is used to process an input signal；
One soft decision circuit, is coupled to the feedforward control wave filter, and feedforward control simultaneously can be according to the feedforward control
One output signal of wave filter and a feedback signal perform soft decision operation to produce a result of decision signal；
And
One feedback wave filter, is coupled to the soft decision circuit, to produce this time according to the result of decision signal
Credit number.
2. equalizing device as claimed in claim 1, it is characterised in that the feedforward control wave filter
The feedback signal of the output signal and the feedback wave filter constitutes an input signal of the soft decision circuit, should
Soft decision circuit is performed when the soft decision is operated and judges whether the input signal of the soft decision circuit falls into one
The result of decision signal is produced in soft decision interval corresponding to decision boundary.
3. equalizing device as claimed in claim 2, it is characterised in that when the soft decision circuit should
Input signal is fallen into when in soft decision interval, and the soft decision circuit produces corresponding to soft decision interval
Signal level as the result of decision signal, and when the soft decision circuit the input signal be located at this it is soft certainly
When plan is interval outer, the soft decision circuit produces corresponding to the input signal of the soft decision circuit one neighbouring time
A signal level of symbol is selected as the result of decision signal.
4. equalizing device as claimed in claim 3, it is characterised in that institute is right in the soft decision is interval
The signal level answered is the input signal level of the soft decision circuit.
5. equalizing device as claimed in claim 3, it is characterised in that it is soft that the decision boundary is located at this
One center of decision-making interval, and the interval interior corresponding signal level of the soft decision is the soft decision area
Between the center corresponding to a signal level.
6. equalizing device as claimed in claim 3, it is characterised in that the equalizing device is used in
One quadrature carrier amplitude modulation framework, and the soft decision circuit is adopted prior to a first axle of a correspondence planisphere
A soft decision result with the interval execution soft decision operation of the soft decision and then according to the first axle exists
One second axle of the constellation figure performs soft decision operation using the soft decision is interval, to produce the decision-making
Consequential signal.
7. equalizing device as claimed in claim 3, it is characterised in that the equalizing device is used in
One quadrature carrier amplitude modulation framework, and the soft decision circuit is simultaneously in the first axle of the constellation figure
And second axle performs soft decision operation using the soft decision is interval, to produce the result of decision signal.
8. a kind of soft decision method for being used in an equalizing device, includes：
Using a feedforward control wave filter, an input signal is processed；
According to the output signal and a feedback signal of the feedforward control wave filter, perform soft decision operation with
Produce a result of decision signal；And
Using a feedback wave filter, the feedback signal is produced according to the result of decision signal.
9. soft decision method as claimed in claim 8, it is characterised in that the feedforward control wave filter
The feedback signal of the output signal and the feedback wave filter constitutes an input signal of the soft decision circuit, with
And perform the soft decision operation to produce the result of decision signal the step of include：
Whether the soft decision corresponding to a decision boundary is fallen into according to the input signal of the soft decision circuit
The result of decision signal is produced in interval.
10. soft decision method as claimed in claim 9, it is characterised in that according to the soft decision circuit
Whether the input signal falls into the soft decision interval corresponding to the decision boundary to produce the result of decision
The step of signal, includes：
When the input signal of the soft decision circuit is fallen into soft decision interval, produce the soft decision interval
An interior corresponding signal level is used as the result of decision signal；And
When the input signal of the soft decision circuit is interval outer positioned at the soft decision, the soft decision circuit is produced
The input signal corresponding to a neighbor candidate symbol a signal level as the result of decision signal.
11. soft decision methods as claimed in claim 10, it is characterised in that institute in the soft decision is interval
The corresponding signal level is the input signal level of the soft decision circuit.
12. soft decision methods as claimed in claim 10, it is characterised in that institute in the soft decision is interval
The corresponding signal level is the signal level corresponding to the interval center of the soft decision, and should be certainly
Plan border is located at the interval center of the soft decision.
13. soft decision methods as claimed in claim 10, it is characterised in that the equalizing device is used
Include in a quadrature carrier amplitude modulation framework, and the soft decision method：
Prior to a correspondence planisphere a first axle using the soft decision it is interval perform soft decision operation and
A soft decision result then according to the first axle uses the soft decision in one second axle of the constellation figure
Interval performs soft decision operation, to produce the result of decision signal.
14. soft decision methods as claimed in claim 10, it is characterised in that the equalizing device is used
Include in a quadrature carrier amplitude modulation framework, and the soft decision method：
In the first axle and second axle of the constellation figure, using the soft decision, interval to perform this soft simultaneously
Decision operation, to produce the result of decision signal.
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|---|---|---|---|
| CN201511000453.5A CN106921598A (en) | 2015-12-28 | 2015-12-28 | Equalizing device and its soft decision method |
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| CN201511000453.5A CN106921598A (en) | 2015-12-28 | 2015-12-28 | Equalizing device and its soft decision method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101189845A (en) * | 2005-05-03 | 2008-05-28 | 英特尔公司 | Techniques for reduction of delayed reflection inter-symbol interference |
| CN101567866A (en) * | 2008-04-24 | 2009-10-28 | 矽统科技股份有限公司 | Decision feedback equalizer and method thereof |
| CN1998137B (en) * | 2004-04-09 | 2010-05-12 | 上海奇普科技有限公司 | Apparatus for and method of controlling a feedforward filter of an equalizer |
-
2015
- 2015-12-28 CN CN201511000453.5A patent/CN106921598A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1998137B (en) * | 2004-04-09 | 2010-05-12 | 上海奇普科技有限公司 | Apparatus for and method of controlling a feedforward filter of an equalizer |
| CN101189845A (en) * | 2005-05-03 | 2008-05-28 | 英特尔公司 | Techniques for reduction of delayed reflection inter-symbol interference |
| CN101567866A (en) * | 2008-04-24 | 2009-10-28 | 矽统科技股份有限公司 | Decision feedback equalizer and method thereof |
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