CN105991148B - Radio receiver and its signal processing method - Google Patents
Radio receiver and its signal processing method Download PDFInfo
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- CN105991148B CN105991148B CN201510094181.3A CN201510094181A CN105991148B CN 105991148 B CN105991148 B CN 105991148B CN 201510094181 A CN201510094181 A CN 201510094181A CN 105991148 B CN105991148 B CN 105991148B
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Abstract
The present invention relates to a kind of radio receivers, include：One time domain channel estimation circuit, for receiving a part of signal according to one in the time domain to generate a channel information；One fast Fourier transform circuit couples the time domain channel estimating circuit, for converting another part of the reception signal and the channel information to frequency domain to generate multiple reception data；One balanced device couples the fast Fourier transform circuit, for adjusting multiple reception data to generate the equalization data of multiple plural kenels；One adjustment unit couples the balanced device, for adjusting multiple equalization data, makes an equalization data adjusted closer to the origin of complex number plane；And a decision circuit, the adjustment unit is coupled, is used to generate multiple binary data according to multiple equalization data adjusted.
Description
Technical field
The present invention relates to radio receivers, especially with respect to the decision feedback channel estimation circuit of radio receiver
With signal processing method, and the channel estimation methods based on decision feedback.
Background technique
T-DMB (Digital Terrestrial Multimedia Broadcast, hereinafter referred to as
DTMB single carrier mode and multi-carrier mode can) be divided into.The DTMB of multi-carrier mode is a kind of based on Domain Synchronous (Time
Domain Synchronous, TDS) orthogonal frequency division multiplexing (Orthogonal Frequency Division
Multiplexing, OFDM) transmission specification.A data frame (data frame) for DTMB signal includes frame header (frame
Header) with frame ontology (frame body).Frame header includes pseudo noise (pseudo noise, PN) sequence, can be used to
It is synchronous with signal that time domain carries out channel estimation.
Referring to Fig. 1, it is the functional block diagram of known DTMB signal receiver.Reception signal received by antenna is through mould
After quasi- digital quantizer 110 is converted to number format, its gain is adjusted by automatic gain control circuit 120.After through mixing electricity
130 frequency reducing of road, then by time domain channel estimating circuit 140 in the time domain according to decision feedback information and a data frame frame header into
Row channel estimation.Estimate the frame ontology of obtained channel information and the data frame via fast Fourier transform (Fast
Fourier Transform, FFT) conversion of circuit 150 is to after frequency domain, and balanced device 160 is in frequency domain according to the channel information to frame sheet
Body is handled, to reduce the interference of multi-path channel and generate multiple equalization datas.Decision circuit 170 is by equalization data later
After changing into binary data, the programs such as demodulated, decoded, being deinterleaved by post processing electric circuit 190, to obtain transmission string
Stream.Decision circuit 170 may, for example, be hard decision (hard decision) circuit or soft decision (soft decision) electricity
Road.In general, time domain channel estimating circuit 140 is typically based on lowest mean square (Least Mean Square, LMS) algorithm
Low-density checksum (Low Density Parity Check, LDPC) code is calculated in a manner of iteration (iteration), because
This above-mentioned binary data on the other hand by fast Flourier inverse conversion (Inverse Fast Fourier Transform,
IFFT) conversion of circuit 180 is iterated operation when institute to subsequent data frame as time domain channel estimating circuit 140 to time domain
The decision feedback information needed.
Following equation indicates the reception data R that fast Fourier transform circuit 150 is exportedn,k(corresponding n-th of symbol
Number k-th of subcarrier)：
Wherein, Xn,kFor the transmission data of k-th of subcarrier of nth symbol, Hn,kIt is carried for k-th of son of nth symbol
The channel gain of wave, Nn,kFor additive white Gaussian noise (the Additive White of k-th of subcarrier of nth symbol
Gaussian Noise, AWGN).
Balanced device 160 will receive data Rn,kDivided by channel gain Hn,kTo be equalized data
Above-mentioned channel is likely to be general multi-path channel (multipath channel), channel impulse response
(Channel Impulse Response, CIR) is as shown in Figure 2 A；However it could also be possible that 0-dB echo channel (0-dB echo
Channel), channel impulse response is as shown in Figure 2 B, and the energy of two groups of channels is suitable, therefore rings with similar pulse
It answers.Periodic recess (notch), indent will occur in its corresponding frequency response in channel impulse response shown in Fig. 2 B
Channel gain Hn,kIt is minimum, so that the noise contribution (N in equation (2)N, k) be amplified, influence equalization dataIt is correct
Property.And when the length of channel is longer, recess number just the more, equalization dataProbability affected by noise is consequently increased.
Referring to Fig. 3, it is equalization dataPosition view on planisphere (constellation diagram).Figure
In with 16-QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation) for, represented by dashed circles constellation
The position of point, black circle 310 then represent equalization dataPosition on planisphere.By equation (2) it is found that when quick
The reception data R that Fourier transform circuit 150 is exportedn,kDivided by minimum channel gain Hn,kWhen, it will cause equalization dataValue become larger, that is, equalization dataPosition on planisphere can be far from the origin of planisphere, and causing originally can
It can be judged as the equalization data of constellation point 320(such as in position of black circle 340), because being offset to filled circles
It puts 310 position and constellation point 330 is mistaken for by decision circuit 170.When this kind of wrong data the more when (such as because of 0-dB
Recess number caused by the length of echo channel is longer increases), time domain channel estimating circuit 140 just can not be effectively according to quickly
The feedback information of Fourier inverse transform circuit 180 does channel estimation, finally reduces the efficiency for receiving circuit, or even result in
The whole correctness for receiving data is deteriorated.
Summary of the invention
In view of the deficiencies in the prior art, a purpose of the present invention is that providing a kind of radio receiver and its signal processing
The decision feedback channel estimation circuit of method and radio receiver and channel estimation methods based on decision feedback, to mention
The correctness of the reception data of high radio receiver and the efficiency for increasing decision feedback channel estimation.
The present invention proposes a kind of radio receiver, includes：One time domain channel estimation circuit is used in the time domain according to one
A part of signal is received to generate a channel information；One fast Fourier transform circuit couples the time domain channel estimating circuit,
For another part of the reception signal and the channel information being converted to frequency domain to generate multiple reception data；One balanced device,
The fast Fourier transform circuit is coupled, receives data for adjusting these to generate the equalization data of multiple plural kenels；One
Adjustment unit couples the equilibrium eqalizing cricuit, for adjusting these equalization datas, makes an equalization data adjusted closer to plural number
The origin of plane；And a decision circuit, the adjustment unit is coupled, is used to generate according to these equalization datas adjusted multiple
Binary data.
The present invention separately proposes a kind of signal processing method of radio receiver, includes：Letter is received according to one in the time domain
Number a part to generate a channel information；Another part of the reception signal and the channel information are converted to frequency domain, to produce
Raw multiple reception data；It adjusts these and receives data, to generate the equalization data of multiple plural kenels；Adjust these balanced numbers
According to making an equalization data adjusted closer to the origin of complex number plane；And it is generated according to these equalization datas adjusted
Multiple binary data.
The decision feedback channel of radio receiver and its signal processing method and radio receiver of the invention is estimated
Meter circuit and the channel estimation methods based on decision feedback can be improved the correctness and increasing of the reception data of radio receiver
Add the efficiency of decision feedback channel estimation.Compared to known technology, the present invention suitably adjusts the data after equilibrium, is passed with reducing
Influence of the noise of defeated process to signal.Data adjusted have average distribution on planisphere, therefore through decision-making mechanism
Available more accurate data afterwards, and help to be promoted the efficiency of decision feedback channel estimation.
Detailed description of the invention
For the above objects, features and advantages of the present invention can be clearer and more comprehensible, below in conjunction with attached drawing to tool of the invention
Body embodiment elaborates, wherein：
Fig. 1 is the functional block diagram of known DTMB signal receiver；
Fig. 2A is the schematic diagram of the channel impulse response of general multi-path channel；
Fig. 2 B is the schematic diagram of the channel impulse response of 0-dB echo channel；
Fig. 3 is equalization dataPosition view on planisphere；
The planisphere and corresponding boundary that Fig. 4 A is 16-QAM；
The planisphere and corresponding boundary that Fig. 4 B is 64-QAM；
Fig. 5 is the functional block diagram of DTMB signal receiver of the invention；
Fig. 6 is equalization data of the present inventionPosition view before the adjustment on planisphere and after adjustment；And
Fig. 7 is the flow chart of an embodiment of the channel estimation methods of the invention based on decision feedback.
Component label instructions in figure：
110 analog-digital converters
120 automatic gain control circuits
130 mixting circuits
140 time domain channel estimating circuits
150 fast Fourier transform circuits
160 balanced devices
170 decision circuits
180 fast Flourier inverse transform circuits
190 post processing electric circuits
310,340,620,630 black circle
320,330 constellation point
410,420,610 boundary
510 front stage circuits
520 channel impulse response monitoring units
530 adjustment units
S710~S770 step
Specific embodiment
The technical terms of following description are the idioms referring to the art, if this specification is to part term
It is illustrated or defines, the explanation of the part term is to be subject to the explanation or definition of this specification.
It is an object of the present invention to moderately adjusting the equalization data seriously affected by channel, it is adjusted it
It is located at position more appropriate on planisphere afterwards.So-called position more appropriate refers in the specific range on planisphere herein,
The boundary of the range and the edge of constellation point have a specific range.The planisphere of 16-QAM as shown in Figure 4 A, boundary 410 with
The constellation point of periphery has the distance of d1, the planisphere of 64-QAM as shown in Figure 4 B, and boundary 420 and peripheral constellation point have d2's
Distance.The setting on boundary 410 and boundary 420 and modulation system (such as 16-QAM, 64-QAM, 256-QAM ... etc.) and channel are long
It spends related.When the equalization data being adjustedPositioned at position more appropriate (namely such as 420 institute of boundary 410 and boundary
In the range of decision), the result of decision of decision circuit 170 will more be spread evenly across each constellation point, and such result can be with
It is fifty-fifty modulated to transmit again in each constellation point closer to the setting of transmission end, that is, by transmission data.Thus time domain
The available more accurate feedback information of channel estimation circuit 140, efficiently to complete the interative computation of channel estimation.
Referring to Fig. 5, it is the functional block diagram of DTMB signal receiver of the invention.The simulation numeral of script Fig. 1 turns
Parallel operation 110, automatic gain control circuit 120 and mixting circuit 130 are indicated so that front stage circuits 510 are blanket.DTMB of the invention
Signal receiver additionally comprises the channel impulse response monitoring unit 520 for being coupled to time domain channel estimating circuit 140 and coupling
Adjustment unit 530 between balanced device 160 and decision circuit 170.Channel impulse response monitoring unit 520 is used to according to time domain
The obtained channel information of channel estimation circuit 140, such as channel length (channel length) and channel energy
(channel power), referring again to modulating mode used in current received DTMB signal (such as 16-QAM, 64-QAM,
256-QAM ... etc.), it tables look-up and obtains boundary value B and regulation coefficient S.Adjustment unit 530 is by equalization dataWith boundary value B ratio
It is right, to judge whether that equalization data should be adjustedSuch as work as equalization dataOutside boundary, the equalization data is indicatedInfluence degree by channel is big, and adjustment unit 530 adjusts the equalization data according to regulation coefficient S at this timeBefore adjustment
And equalization data adjustedDisplacement it is proportional to regulation coefficient S, and equalization data adjustedIt will be located at
In boundary；And if the equalization data that script balanced device 160 is exportedIt is located in boundary, then adjustment unit 530 is uncomfortable
The whole equalization dataIt is directly output to post processing electric circuit 190 and fast Flourier inverse transform circuit 180.
As previously mentioned, when channel length is longer, the recess number occurred on the frequency response chart of channel is just the more.Recess number
More than one, equalization dataThe probability of error just increases, that is, equalization dataDeviate the probability of the origin of planisphere just
Higher, it is necessary to by more equalization datas in adjustment for adjustment unit 530 at this timeFurther the origin of planisphere.Namely
It says, under same modulating mode, when channel length is longer, channel impulse response monitoring unit 520 should export lesser boundary
Value B, to reduce under this condition in particular range defined on planisphere, the balanced number of the unit 530 that is so adjusted adjustment
According toIt will be more；Otherwise it is shorter to work as channel length, then should export biggish boundary value B.And when determining regulation coefficient S,
Channel impulse response monitoring unit 520 is with reference to modulating mode and channel information.Corresponding different modulating mode, channel pulse are rung
Monitoring unit 520 is answered to be preset with different regulation coefficient S, this regulation coefficient S can be also finely adjusted according to channel energy.Work as multichannel
The channel energy ratio of diameter is closer to (channel is closer to 0-dB echo channel shown in Fig. 2 B) when 1, the situation in multichannel path
Can be more serious, the notch depth of channel frequency response will become deeper at this time, cause equalization dataDeviate constellation primitive
The situation of point is more serious, and adjustment unit 530 is by the equalization data at this timeAdjustment amount toward origin adjustment will be higher；However such as
Though fruit has multipath situation, the channel energy ratio of multipath differs bigger with 1, that is, two groups of channels capacity volume variance compared with
Greatly, the notch depth of channel frequency response will become shallower at this time, that is to say, that in the channel gain H of indentn,kBe unlikely to for
0, therefore cause equalization dataThe situation for deviateing planisphere origin is less serious, and adjustment unit 530 is by the equilibrium number at this time
According toAdjustment amount toward origin adjustment will be lower.Data in one embodiment, the lookup of writing edge dividing value B and regulation coefficient S
Table (Look-Up Table, LUT) is to establish in an analog manner.Such as it is prerequisite determine modulating mode, then change channel combination (letter
Road length and channel energy) find out the boundary value B and regulation coefficient S that corresponding various channels combine.Channel impulse response later
Monitoring unit 520 can be (long comprising channel according to the channel information that modulating mode and time domain channel estimation circuit 140 are transmitted
Degree and channel energy) it penetrates to table look-up and finds out corresponding boundary value B and regulation coefficient S.In a preferred embodiment, if channel arteries and veins
It rushes response monitoring unit 520 and judges that channel combination will not cause serious equalization dataMistake, such as channel is shorter
And multi-path channel capacity volume variance it is larger when, channel impulse response monitoring unit 520 can control adjustment unit 530 and not appoint
What judgement and adjustment, and the output of balanced device 160 is directly sent to decision circuit 170.
Adjustment unit 530 judges equalization dataWhether it is located in the range of boundary value B determines.If equalization dataIn the range of determining positioned at boundary value B, then adjustment unit 530 is not by the equalization dataIt is multiplied by regulation coefficient S,
Namely decision circuit 170 will carry out decision with original equalization data；Opposite, if equalization dataPositioned at boundary value
Outside the range that B is determined, then adjustment unit 530 is by the equalization dataIt is multiplied by regulation coefficient S, makes balanced number adjusted
According toIn the range of determining positioned at boundary value B.It is very small to note that boundary value B can be set to, or is set as
0, equalization datas all at this timeIt will all fall within outside the range that boundary value B is determined, result would be equivalent to not set side
Dividing value B, adjustment unit 530 is directly to all equalization datasIt is adjusted.Adjustment unit 530 is by equalization dataMultiply
It is simultaneously to the equalization data when upper regulation coefficient SReal part (part I) and imaginary part (part Q) be multiplied by the adjustment system
Number S.That is 530 change equalization datas of adjustment unitSize without changing its phase, that is, it is adjusted
Weigh dataPosition and adjustment before equalization dataPosition line by by the origin of planisphere, and adjust system
Number S is the positive number between 0 and 1.Referring to Fig. 6, it is equalization data of the present inventionBefore the adjustment on planisphere and
Position view adjusted.Equalization data before adjustmentThe position of black circle 620 in figure, and boundary 610 is
It is determined according to boundary value B.Adjustment unit 530 first determines whether the equalization data before adjustmentWhether it is located at boundary 610 to be determined
Range except.The mode of judgement is by equalization dataReal part absolute value (i.e. the size of real component) and
The absolute value (i.e. the size of imaginary) of imaginary part is made comparisons with boundary value B respectively.If any value in the two is greater than
Boundary value B indicates the equalization data before adjustmentExcept the range that boundary 610 is determined, otherwise then it is located at boundary
Within the scope of 610 determine.If it is determined that the equalization data before adjustmentWithin the scope of determining positioned at boundary 610,
Then adjustment unit 530 does not handle the equalization dataAnd it is directly output to decision circuit 170；However if adjustment before equilibrium
DataExcept the range that boundary 610 is determined (such as position of black circle 620), then by the equalization data
It is multiplied by regulation coefficient S, and equalization data adjustedThe position of black circle 630, black circle 620 may then be moved to
The origin for passing through complex number plane with the line of black circle 630.That is, equalization dataIt before adjustment may be by decision
Circuit 170 is determined into constellation point 330, and adjusts post-equalization dataPositioned at position more appropriate, later decision circuit 170 according to
According to its decision-making mechanism by equalization dataDetermine into constellation point 320.
In conclusion may have most equalization datas originallyIt is influenced by the noise being amplified and falls within boundary
Except 610 ranges determined, then the numerical value that decision circuit 170 exports will have most of minority by decision for constellation point periphery
Point causes distribution unequal, and the error rate of data improves；When using mechanism of the invention, by the equalization data of influence of noiseThe numerical value after decision can be allow to be evenly distributed within each constellation point via suitably adjusting, such data are just
True property will improve, also therefore the available more accurate feedback information of time domain channel estimating circuit 140 and reduce to subsequent number
The number of operation is iterated according to frame.It is explained with an actual example：Modulating mode is 64-QAM, code rate (code
It rate) is 0.6, channel is the 0-dB echo channel comprising 393 nodes (tap), and boundary value B is set as normalized transmission energy
1.5 times of amount, regulation coefficient S is set as 0.125.Before Regulation mechanism incorporated in the present invention, time domain channel estimating circuit 140 is counted
Completion 7~11 times interative computations are needed when calculating low density parity check code on average, and calculate low density parity check code
Error rate is 8.9e-2；In comparison, it after Regulation mechanism incorporated in the present invention, is averaged needed for time domain channel estimating circuit 140
The number of iterations is greatly decreased to 6~8 times, and error rate also improves to 8.4e-2.
Referring to Fig. 7, it is the flow chart of an embodiment of the channel estimation methods of the invention based on decision feedback.It removes
Outside the decision feedback channel estimation circuit of radio receiver above-mentioned, the present invention also correspondingly discloses a kind of decision feedback
Channel estimation methods, applied to the receiving end of DTMB signal, can improve equalization data is influenced by multi-path channel.This method by
Aforementioned DTMB signal receiver shown in fig. 5 or its equivalent device execute.As shown in fig. 7, decision feedback channel of the present invention is estimated
One embodiment of meter method comprises the steps of：
Step S710：Signal is received according to one in the time domain and a decision feedback information calculates a channel information.This step
The channel information, channel information example can iteratively and with reference to decision feedback information be calculated by lowest mean square algorithm
It such as include channel gain, channel length and channel energy information；
Step S720：A part of the reception signal and the channel information are converted to frequency domain, the portion of the reception signal
Divide and forms multiple reception data after conversion.This step is converted using fast fourier by the part of the reception signal and the letter
Road information is converted to frequency domain, after conversion, the reception data of multiple plural kenels is formed, as shown in equation (1)；
Step S730：The reception data of these plural kenels are adjusted, to obtain multiple equalization datas.This step is one balanced
These reception data are reduced the interference of multi-path channel divided by channel gain according to the channel information, and generated by step
Multiple equalization datas.As shown in equation (2), these equalization datas are similarly plural kenel；
Step S740：Boundary value B and regulation coefficient S is generated according to the modulating mode of the reception signal and the channel information.
This step generates boundary value B and regulation coefficient S by tabling look-up, and index used is the modulating mode for receiving signal when tabling look-up, with
And the information such as the channel information channel length that is included and channel energy.The look-up table be in advance for different modulating mode and
Channel information finds out optimal boundary value B and regulation coefficient S by the mode of simulation；
Step S750：These equalization datas are adjusted according to boundary value B and regulation coefficient S, make equalization data phase adjusted
Compared with unadjusted equalization data closer to the origin of complex number plane.As shown in equation (2), since these receive data in step
Noise contribution may be caused to be amplified divided by minimum channel gain in the equalization step of rapid S730, influence equalization data just
True property.As shown in figure 3, may originally be located at the equalization data on planisphere at black circle 340, the noise contribution shadow being amplified
The position of black circle 310 is changed to after sound, thus just causes mistake when decision.So this step is first according to boundary value B
Judge whether equalization data is located at except the range that boundary is determined.If it is not, then not adjusting the equalization data；If so,
Then by the equalization data multiplied by regulation coefficient S so that equalization data adjusted can closer to complex number plane origin,
It namely falls within the scope of boundary value B determines.It is by the equalization data when by the equalization data multiplied by regulation coefficient S
Real part and the imaginary part equalization data that is multiplied by regulation coefficient S simultaneously, therefore adjusts front and back only have size change but phase not
Become.Regulation coefficient S is the positive number between 0 and 1；
Step S760：Multiple binary data are generated according to these equalization datas adjusted.This step is steps in decision-making,
Equalization data carries out decision, available more accurate binary data again after being adjusted；And
Step S770：These binary data are subjected to fast Flourier inverse conversion to generate the decision feedback information.Most
The binary data is subjected to fast Flourier inverse conversion with decision feedback information needed for obtaining step S710 afterwards.Through passback
Decision feedback information, help reduce the subsequent calculating of step S710 needed for the number of iterations.
In addition to being used for decision feedback channel estimation, core of the invention concept also can be used for non-use decision feedback channel and estimate
The radio receiver of meter, in this case, DTMB signal receiver shown in fig. 5 do not include fast Flourier inverse conversion electricity
Road 180, the right present invention still facilitate decision circuit 170 and export more accurate binary data.And corresponding signal processing side
Method includes aforementioned step S710~S760, but the generation of the channel information of step S710 is not required to reference to decision feedback information.
Since those skilled in the art of the present technique can understand the method hair of Fig. 7 by the disclosure content of the device inventions of Fig. 5
Bright implementation detail and variation, therefore, to avoid superfluous text, before the disclosure requirement and exploitativeness for not influencing this method invention
It puts, repeat description gives memorandum herein.Furthermore though previous embodiment, by taking the signal of DTBM as an example, so this is not to this hair
Bright limitation, the art personage, which under this invention can disclose, is suitably applying the present invention to other types of multicarrier just
Hand over frequency division multiplexing quadrature amplitude modulation signal.
Claims (20)
1. a kind of radio receiver, includes：
One time domain channel estimation circuit, for receiving a part of signal according to one in the time domain to generate a channel information；
One fast Fourier transform circuit couples the time domain channel estimating circuit, for by another part of the reception signal and
The channel information is converted to frequency domain to generate multiple reception data；
One balanced device couples the fast Fourier transform circuit, for adjusting multiple reception data to generate multiple complex number types
The equalization data of state；
One adjustment unit couples the balanced device, for adjusting multiple equalization data, keeps an equalization data adjusted closer
The origin of complex number plane；And
One decision circuit couples the adjustment unit, is used to generate multiple binary numbers according to multiple equalization data adjusted
According to.
2. radio receiver as described in claim 1, which is characterized in that the adjustment unit is determined according to one first reference value
It is fixed whether to adjust multiple equalization data, when the absolute value of the real part of multiple equalization data and the absolute value of imaginary part
One of be greater than first reference value, then adjust multiple equalization data.
3. radio receiver as claimed in claim 2, which is characterized in that the adjustment unit is by multiple equalization data
Real part and imaginary part are adjusted according to one second reference value simultaneously, which is characterized in that multiple equalization data is after adjustment and before adjustment
Phase having the same.
4. radio receiver as claimed in claim 3, which is characterized in that the adjustment unit is by multiple equalization data
Real part and imaginary part are multiplied by second reference value simultaneously, and wherein second reference value is for the positive number between 0 and 1.
5. radio receiver as claimed in claim 3, further includes：
One monitoring unit couples the time domain channel estimating circuit and the adjustment unit, for the modulation according to the reception signal
Mode and the channel information generate first reference value and second reference value.
6. radio receiver as claimed in claim 3, which is characterized in that the channel information includes a channel length and a letter
Road energy.
7. radio receiver as claimed in claim 6, which is characterized in that first reference value is with the channel length at anti-
Than.
8. radio receiver as claimed in claim 6, which is characterized in that second reference value is according to the channel energy tune
It is whole.
9. radio receiver as described in claim 1, which is characterized in that the reception signal is for the ground of a multi-carrier mode
Face digital multimedia broadcasting signal.
10. radio receiver as described in claim 1, further includes：
One fast Flourier inverse transform circuit couples the decision circuit and the time domain channel estimating circuit, is used to multiple two
Binary data carries out fast Flourier inverse conversion to generate a decision feedback information；
Wherein the time domain channel estimating circuit more generates the channel information according to the decision feedback information.
11. a kind of signal processing method of radio receiver, includes：
A part of signal is received to generate a channel information according to one in the time domain；
Another part of the reception signal and the channel information are converted to frequency domain, to generate multiple reception data；
Multiple reception data are adjusted, to generate the equalization data of multiple plural kenels；
Multiple equalization data is adjusted, makes an equalization data adjusted closer to the origin of complex number plane；And
Multiple binary data are generated according to multiple equalization data adjusted.
12. the signal processing method of radio receiver as claimed in claim 11, which is characterized in that the adjustment is multiple
The step of data that weigh is to decide whether to adjust multiple equalization data according to one first reference value, when the reality of multiple equalization data
One of absolute value and the absolute value of imaginary part of number part are greater than first reference value, then adjust multiple balanced number
According to.
13. the signal processing method of radio receiver as claimed in claim 12, which is characterized in that the adjustment is multiple
The step of data that weigh is to adjust the real part of multiple equalization data and imaginary part according to one second reference value simultaneously, and feature exists
In multiple equalization data phase having the same after adjustment and before adjusting.
14. the signal processing method of radio receiver as claimed in claim 13, which is characterized in that the adjustment is multiple
The step of data that weigh is that the real part of multiple equalization data and imaginary part are multiplied by second reference value simultaneously, which is characterized in that should
Second reference value is for the positive number between 0 and 1.
15. the signal processing method of radio receiver as claimed in claim 13, further includes：
First reference value and second reference value are generated according to a modulating mode of the reception signal and the channel information.
16. the signal processing method of radio receiver as claimed in claim 13, which is characterized in that the channel information includes
One channel length and a channel energy.
17. the signal processing method of radio receiver as claimed in claim 16, which is characterized in that first reference value is
It is inversely proportional with the channel length.
18. the signal processing method of radio receiver as claimed in claim 16, which is characterized in that second reference value is
It is adjusted according to the channel energy.
19. the signal processing method of radio receiver as claimed in claim 11, which is characterized in that the reception signal be for
The terrestrial dmb signal of one multi-carrier mode.
20. the signal processing method of radio receiver as claimed in claim 11, further includes：
Multiple binary data is subjected to fast Flourier inverse conversion to generate a decision feedback information；
Wherein this generates the step of channel information according to the part of the reception signal and further includes：
The channel information is generated according to the decision feedback information.
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| TWI454067B (en) * | 2009-03-10 | 2014-09-21 | Realtek Semiconductor Corp | Receiving device and method thereof |
| EP2228955B1 (en) * | 2009-03-13 | 2017-02-22 | OCT Circuit Technologies International Limited | System and method for OFDM reception in the presense of Doppler effect based on time domain windowing |
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| TWI266489B (en) * | 2005-06-07 | 2006-11-11 | Realtek Semiconductor Corp | Apparatus and method for increasing signal estimation accuraccy |
| CN1984100A (en) * | 2006-04-05 | 2007-06-20 | 威盛电子股份有限公司 | Method of equalizing signal in orthogonal frequency-division multiplexing fundamental frequency receiver |
| CN101983497A (en) * | 2008-04-03 | 2011-03-02 | 艾色拉公司 | Equalisation processing |
| CN102386947A (en) * | 2010-08-30 | 2012-03-21 | 瑞昱半导体股份有限公司 | Communication device and method thereof |
| CN103379056A (en) * | 2012-04-23 | 2013-10-30 | Nxp股份有限公司 | Reduced latency channel-estimatio |
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