CN102957646B - Equilibrium method and device based on pre-filter - Google Patents
Equilibrium method and device based on pre-filter Download PDFInfo
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- CN102957646B CN102957646B CN201210510927.0A CN201210510927A CN102957646B CN 102957646 B CN102957646 B CN 102957646B CN 201210510927 A CN201210510927 A CN 201210510927A CN 102957646 B CN102957646 B CN 102957646B
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000011045 prefiltration Methods 0.000 title claims abstract description 30
- 238000005070 sampling Methods 0.000 claims abstract description 39
- 230000001360 synchronised effect Effects 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005562 fading Methods 0.000 description 2
- 238000012549 training Methods 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000013386 optimize process Methods 0.000 description 1
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Abstract
The invention discloses an equilibrium method and an equilibrium device based on a pre-filter. The equilibrium method comprises the steps that a received signal is subjected to down sampling and synchronization treatment, and burst data and synchronization data are respectively obtained; the burst data is subjected to biased sampling according to the synchronization data, and biased sampling data is obtained; the biased sampling data is subjected to channel estimation, and first channel estimation information is obtained; the first channel estimation information is utilized to set the coefficient of a merged filter, and the merged filter is adopted to merge the biased sampling data; the merged data is subjected to channel estimation, and second channel estimation information is obtained. With the adoption of the equilibrium method and the device based on the pre-filter, the virtual multi-antenna technology based on biased sampling can be adopted, so that the equipment cost is reduced. Besides, a new merging algorithm is also provided, and the algorithm can be used for optimizing the channel estimation in the signal merging process.
Description
Technical field
The present invention relates to signal equalization technology, particularly relate to the equalization methods based on prefilter and device.
Background technology
In wireless channel, due to the time domain disperse characteristic of signal, receiver receives the multipath fading signal of the multiple different delay sending signal simultaneously, and the multi-path influence of channel will cause intersymbol interference, and receiver must take balancing technique to overcome multipath fading to recover original transmission signal.
In order to obtain good portfolio effect, industry can process antenna technology usually.Current general employing multiple antennas receives and obtains multiple signals, but uses multi-antenna technology can increase extra cost.And in order to reduce the process complexity of signal detector below, usually also can utilize merge algorithm that multiple signals are merged into a road signal.In existing various merge algorithm, maximum-ratio combing algorithm is the superior algorithm of a kind of Performance comparision, but this algorithm is when merging signal, is not optimized process to channel-estimation information.
Summary of the invention
Based on this, be necessary for the problems referred to above, a kind of equalization methods based on prefilter and device be provided, can equipment cost be reduced, optimized transmission channel.
Based on an equalization methods for prefilter, comprising:
Down-sampling and synchronous process are carried out to the signal received, obtains bursty data and synchrodata respectively;
According to described synchrodata, there is inclined sampling to described bursty data, obtain and have inclined sampled data;
There is inclined sampled data to carry out channel estimating to described, obtain channel first estimated information;
Utilize described channel first estimated information, the coefficient of combined filter is set, and utilize this combined filter to have inclined sampled data to merge to described;
Merging data is carried out channel estimating, obtains channel second estimated information.
Correspondingly, a kind of balancer based on prefilter, comprising:
Signal Pretreatment unit, for carrying out down-sampling and synchronous process to the signal received, obtains bursty data and synchrodata respectively;
What be connected with described Signal Pretreatment unit has inclined sampling unit, for according to described synchrodata, has inclined sampling to described bursty data, obtains and has inclined sampled data;
With the described signal pre-filtering unit having inclined sampling unit to be connected, for having inclined sampled data to carry out channel estimating to described, obtain channel first estimated information;
The merging treatment unit be connected with described signal pre-filtering unit, for utilizing described channel first estimated information, arranges the coefficient of combined filter, and utilizes this combined filter to have inclined sampled data to merge to described;
The channel estimating unit be connected with described merging treatment unit, for merging data is carried out channel estimating, obtains channel second estimated information.
Implement the present invention, there is following beneficial effect:
The present invention increases problem to the cost that existing multi-antenna technology brings, provide the virtual multi-antenna technique that a kind of employing has sampling partially to realize, according to synchrodata, have inclined sampling to bursty data, to reach the effect that multiple antennas receives, reduce the cost of antenna and subsequent processes equipment.In addition, also to the deficiency that existing folding exists, provide a kind of new merge algorithm, this algorithm is while merging signal, utilize the data after merging to carry out channel estimating, obtain new channel information, channel information now embodies the phase characteristic of channel.
Accompanying drawing explanation
Fig. 1 is the flow chart of a kind of equalization methods based on prefilter of the present invention;
Fig. 2 is that a kind of equalization methods based on prefilter of the present invention is at single antenna application design sketch;
Fig. 3 is the multiple antennas embodiment flow chart of a kind of equalization methods based on prefilter of the present invention;
Fig. 4 is that a kind of equalization methods based on prefilter of the present invention is at double antenna effect figure;
Fig. 5 is the schematic diagram of a kind of balancer based on prefilter of the present invention;
Fig. 6 is the multiple antennas embodiment schematic diagram of a kind of balancer based on prefilter of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 1 is the flow chart of a kind of equalization methods based on prefilter of the present invention, comprising:
S101: down-sampling and synchronous process are carried out to the signal received, obtains bursty data and synchrodata respectively;
S102: according to described synchrodata, has inclined sampling to described bursty data, obtains and has inclined sampled data;
S103: have inclined sampled data to carry out channel estimating to described, obtains channel first estimated information;
S104: utilize described channel first estimated information, the coefficient of combined filter is set, and utilize this combined filter to have inclined sampled data to merge to described;
S105: merging data is carried out channel estimating, obtains channel second estimated information.
In the present invention, according to synchrodata, inclined sampling is had to down-sampled data, obtain the N group data comprising synchrodata, then channel estimating being carried out to these data, utilize channel evaluation data to calculate pre-filter coefficients, then utilizing prefilter there being inclined sampled signal to merge into a road signal, carry out channel estimating according to this signal, obtain new channel information and signal to noise ratio.
Different from the existing technology utilizing maximum-ratio combing technology to carry out merging treatment, the present invention adopts inclined Sampling techniques, the N group data comprising synchrodata can be obtained, then combined filter provided by the invention is utilized to merge, under the prerequisite not increasing reception antenna, the effect that multi-antenna diversity receives can be reached, can be cost-saving, improve portfolio effect simultaneously.
In addition, the present invention compares conventional mode of single illuminator and multiple receivers, respectively equilibrium treatment is carried out to multiple antennas Received signal strength, then merge according to certain merging criterion, the gain obtained is limited, and the present invention, while merging many sampled signals, can concentrate channel energy, obtain channel information more accurately, improve the ability of equilibrium treatment below further.
Wherein in the middle of an embodiment, also comprise:
Described merging data and described channel second estimated information are sent into balance module detect, return rows vector data;
According to described row vector data, calculate row vector soft bit information data.
The present invention is when the multiple antennas Received signal strength of reality, can first to every root reception antenna, the signal received carries out there is inclined sampling, then combined filter provided by the invention is utilized to merge, then again utilize combined filter provided by the invention to carry out merging treatment to the multiple antennas merging data obtained, obtain one group of data, the balance module then sent into below detects, data are now equivalent to single antenna reception data, can reduce the process complexity of balance module.
Described balance module can adopt existing MMSE-PIC detector to realize, and other detectors also can be adopted to be achieved, and after obtaining detection signal, sends into soft de-mapping device, obtains the Soft Inform ation of each bit of symbol.
For the equipment requirement aspect of signal receiving end, in order to reduce equipment cost, before the signal received being carried out to down-sampling and synchronous process, can comprise: according to 8PSK modulation mode, adopting single-antenna received signal.The present invention utilizes above-mentionedly has inclined Sampling techniques, even adopt single antenna, also can reach the reception of multiple antennas.
One of embodiment:
Fig. 2 is that a kind of equalization methods based on prefilter of the present invention is at single antenna application design sketch.As shown in Figure 2, under 8PSK modulation, HT100 channel condition, adopt maximum merging than (MRC) technology and the performance comparison design sketch adopting the technology of the present invention.
Particularly, in EDGE system, introduce 8PSK modulation, adopt single-antenna received signal, concrete implementation step is as follows:
(1) obtain Received signal strength by reception antenna, obtain the data r of 52 multi-frames.
(2) 4 times of down-sampling process are carried out to reception data r, and according to the length 156.25 of each burst, obtain the array data x that 4 row 160 corresponding to each burst arrange.
(3) recycle data x and corresponding training sequence data, carry out related operation and slip scan computing, complete synchronous process, obtain each burst corresponding, length is the row vector synchrodata y of 148.
(4) according to synchrodata y, there is inclined sampling to the bursty data x obtained, obtain comprising data y, array data y1 that 3 row 148 arrange.
(5) channel estimating is carried out to the inclined sampled data that has obtained, obtain the channel information data h that 3 row 6 arrange
1
(6) channel information data h is utilized
1calculate combined filter coefficient; Then utilize combined filter to there being inclined sampled data y
1carry out merging treatment, obtain the row vector data y that corresponding length is 148
2.
(7) the data y after merging is utilized
2carry out channel estimating, obtain the row vector channel data h that length is 6
2, channel data h now
2meet minimum phase characteristic.
(8) the merging data y obtained
2with channel data h
2, send into existing MMSE-PIC signal detector, obtain the row vector data y that length is 148
3, and according to data y
3, calculate the row vector soft bit information data that length is 348.
Certainly, the present invention does not get rid of the reception adopting multiple antennas to carry out signal yet.The present invention can process according to the Received signal strength of each antenna, and the inclined sampled data that has in the merging treatment stage to each antenna is integrated.Preferably, below in conjunction with Fig. 3, launch explanation for double antenna.
Fig. 3 is the multiple antennas embodiment flow chart of a kind of equalization methods based on prefilter of the present invention.Compared to Figure 1, Fig. 1 is overall flow figure of the present invention, and wherein, the present invention can adopt single antenna or multiple antennas to carry out the reception of signal.Preferably, the multiple antennas embodiment of Fig. 3 is only for double antenna, and obviously, the present invention is also applicable to the situation of other multiple antennas.
S201: according to QPSK modulation system, adopts dual-antenna reception signal; Wherein, described double antenna comprises the first antenna and the second antenna;
S202: down-sampling and synchronous process are carried out to the signal received, obtains bursty data and synchrodata respectively;
S203: according to described synchrodata, has inclined sampling to described bursty data, obtains and has inclined sampled data;
S204: have inclined sampled data to carry out channel estimating to described, obtains channel first estimated information;
S205: utilize described channel first estimated information, the coefficient of combined filter is set, and utilize this combined filter to have inclined sampled data to merge to described;
S206: by the merging data y5 after merging according to the first antenna, and combine according to the merging data y6 after the second antenna merges, obtain described merging data y7;
S207: according to described merging data y5, y6, obtains channel-estimation information, resets the coefficient of described combined filter, and utilize this combined filter again to merge described merging data y7;
S208: merging data is carried out channel estimating, obtains channel second estimated information.
Embodiment two:
Fig. 4 is that a kind of equalization methods based on prefilter of the present invention is at double antenna effect figure.As shown in Figure 4, be QPSK modulation, under HT100 channel condition, adopt maximum merging than (MRC) technology and the performance comparison design sketch adopting the technology of the present invention.
Particularly, in Enhanced EDGE system, introduce QPSK modulation, adopt dual-antenna reception signal under multipath channel, concrete implementation step is as follows:
(1) Received signal strength r is obtained by reception antenna
1, r
2, r
1, r
2all data of 52 multi-frames.
(2) to reception data r
1, r
2carry out 4 times of down-sampling process, and according to the length 187.5 of each burst, obtain the array data x that 4 row 191 corresponding to each burst arrange
1, x
2.
(3) data x is recycled
1, x
2with the training sequence data of correspondence, carry out related operation and slip scan computing, complete synchronous process, obtain the row vector synchrodata y that length corresponding to each burst is 177
1, y
2.
(4) according to synchrodata y
1, y
2, to bursty data x
1, x
2carry out there is inclined sampling, obtain data y
3, y
4, y
3, y
4all array datas that 3 row 177 arrange
(5) to data y
3carry out channel estimating, obtain the channel information data h that 3 row 8 arrange
1.
(6) channel information data h is utilized
1calculate combined filter coefficient; Then utilize combined filter to there being inclined sampled data y
3carry out merging treatment, the length obtained is the row vector data y of 177
5.
(7) to data y
4carry out channel estimating, obtain the channel information data h that 3 row 8 arrange
2.
(8) channel information data h is utilized
2calculate combined filter coefficient; Then utilize combined filter to there being inclined sampled data y
4carry out merging treatment, obtain the row vector data y that length is 177
6.
(9) then data y
5, y
6be combined as data y
7, then to data y
7carry out channel estimating, obtain 2 row 8 row channel information data h
3, data y
5, y
6compound mode as follows:
y
7=[y
5;y
6]
(10) channel information data h is utilized
3calculate combined filter coefficient; Then utilize combined filter to data y
7carry out merging treatment, obtain the row vector data y that length is 177
8.
(11) according to data y
8carry out channel estimating, obtain the row vector channel information h that length is 8
4.
(12) data y
8, h
4send into through existing MMSE-PIC signal detector, obtain the row vector data y that length is 177
9, according to data y
9, calculate the row vector soft bit information data that length is 276.
Fig. 5 is the schematic diagram of a kind of balancer based on prefilter of the present invention, comprising:
Signal Pretreatment unit, for carrying out down-sampling and synchronous process to the signal received, obtains bursty data and synchrodata respectively;
What be connected with described Signal Pretreatment unit has inclined sampling unit, for according to described synchrodata, has inclined sampling to described bursty data, obtains and has inclined sampled data;
With the described signal pre-filtering unit having inclined sampling unit to be connected, for having inclined sampled data to carry out channel estimating to described, obtain channel first estimated information;
The merging treatment unit be connected with described signal pre-filtering unit, for utilizing described channel first estimated information, arranges the coefficient of combined filter, and utilizes this combined filter to have inclined sampled data to merge to described;
The channel estimating unit be connected with described merging treatment unit, for merging data is carried out channel estimating, obtains channel second estimated information.
Fig. 5 and Fig. 1 is corresponding, the operational mode of unit and identical in method in figure.
Fig. 6 is the multiple antennas embodiment schematic diagram of a kind of balancer based on prefilter of the present invention.
As shown in Figure 6, wherein in the middle of an embodiment, comprising:
The detection receiving element be connected with described channel estimating unit, detects for described merging data and described channel second estimated information are sent into balance module, receives the row vector data returned;
The result computing unit be connected with described detection receiving element, for according to described row vector data, calculates row vector soft bit information data.
Described merging treatment unit, comprising:
Data combination unit, for by the merging data y5 after merging according to the first antenna, and combines according to the merging data y6 after the second antenna merges, obtains described merging data y7.
As shown in Figure 6, in the middle of another embodiment, described merging treatment unit, also comprises:
The data be connected with described data combination unit remerge unit, for obtaining channel-estimation information according to described merging data y5, y6, resetting the coefficient of described combined filter, and utilizing this combined filter again to merge described merging data y7.
Fig. 6 and Fig. 3 is corresponding, the operational mode of unit and identical in method in figure.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (8)
1. based on an equalization methods for prefilter, it is characterized in that, comprising:
Down-sampling and synchronous process are carried out to the signal received, obtains bursty data and synchrodata respectively;
According to described synchrodata, there is inclined sampling to described bursty data, obtain and have inclined sampled data;
There is inclined sampled data to carry out channel estimating to described, obtain channel first estimated information;
Utilize described channel first estimated information, the coefficient of combined filter is set, and utilize this combined filter to have inclined sampled data to merge to described;
Merging data is carried out channel estimating, obtains channel second estimated information;
Described merging data and described channel second estimated information are sent into balance module detect, return rows vector data;
According to described row vector data, calculate row vector soft bit information data.
2. the equalization methods based on prefilter according to claim 1, is characterized in that, before carrying out down-sampling and synchronous process, comprising the signal received:
According to 8PSK modulation mode, adopt single-antenna received signal.
3. the equalization methods based on prefilter according to claim 1, is characterized in that, before carrying out down-sampling and synchronous process, comprising the signal received:
According to QPSK modulation system, adopt dual-antenna reception signal; Wherein, described double antenna comprises the first antenna and the second antenna.
4. the equalization methods based on prefilter according to claim 3, is characterized in that, after carrying out the step merged, and before the step of merging data being carried out channel estimating, comprising:
By the merging data y5 after merging according to the first antenna, and combine according to the merging data y6 after the second antenna merges, obtain described merging data y7.
5. the equalization methods based on prefilter according to claim 4, is characterized in that, after obtaining the step of described merging data y7, also comprises:
According to described merging data y7, obtain channel-estimation information, reset the coefficient of described combined filter, and utilize this combined filter again to merge described merging data y7.
6. based on a balancer for prefilter, it is characterized in that, comprising:
Signal Pretreatment unit, for carrying out down-sampling and synchronous process to the signal received, obtains bursty data and synchrodata respectively;
What be connected with described Signal Pretreatment unit has inclined sampling unit, for according to described synchrodata, has inclined sampling to described bursty data, obtains and has inclined sampled data;
With the described signal pre-filtering unit having inclined sampling unit to be connected, for having inclined sampled data to carry out channel estimating to described, obtain channel first estimated information;
The merging treatment unit be connected with described signal pre-filtering unit, for utilizing described channel first estimated information, arranges the coefficient of combined filter, and utilizes this combined filter to have inclined sampled data to merge to described;
The channel estimating unit be connected with described merging treatment unit, for merging data is carried out channel estimating, obtains channel second estimated information;
The detection receiving element be connected with described channel estimating unit, detects for described merging data and described channel second estimated information are sent into balance module, receives the row vector data returned;
The result computing unit be connected with described detection receiving element, for according to described row vector data, calculates row vector soft bit information data.
7. the balancer based on prefilter according to claim 6, is characterized in that, under multiple antennas receiving mode, described merging treatment unit, comprising:
Data combination unit, for by the merging data y5 after merging according to the first antenna, and combines according to the merging data y6 after the second antenna merges, obtains described merging data y7.
8. the balancer based on prefilter according to claim 7, is characterized in that, under multiple antennas receiving mode, described merging treatment unit, also comprises:
The data be connected with described data combination unit remerge unit, for obtaining channel-estimation information according to described merging data y7, resetting the coefficient of described combined filter, and utilizing this combined filter again to merge described merging data y7.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002033923A2 (en) * | 2000-10-17 | 2002-04-25 | Telefonaktiebolaget Lm Ericsson (Publ) | Prefilter design by spectral factorization |
| CN101110801A (en) * | 2006-02-06 | 2008-01-23 | 三星电子株式会社 | Method and apparatus of reducing a number of computations in an equalization process |
| CN101291159A (en) * | 2008-06-17 | 2008-10-22 | 清华大学 | Sending terminal, receiving terminal directly realizing spread-spectrum ultra-wideband and method thereof |
| CN101340217A (en) * | 2008-08-29 | 2009-01-07 | 北京天碁科技有限公司 | Diversity receiving apparatus and method for special carrier TD-MBMS |
-
2012
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002033923A2 (en) * | 2000-10-17 | 2002-04-25 | Telefonaktiebolaget Lm Ericsson (Publ) | Prefilter design by spectral factorization |
| CN101110801A (en) * | 2006-02-06 | 2008-01-23 | 三星电子株式会社 | Method and apparatus of reducing a number of computations in an equalization process |
| CN101291159A (en) * | 2008-06-17 | 2008-10-22 | 清华大学 | Sending terminal, receiving terminal directly realizing spread-spectrum ultra-wideband and method thereof |
| CN101340217A (en) * | 2008-08-29 | 2009-01-07 | 北京天碁科技有限公司 | Diversity receiving apparatus and method for special carrier TD-MBMS |
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Address after: 510663 No. 10 Shenzhou Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee after: Jingxin Network System Co.,Ltd. Address before: 510663 No. 10 Shenzhou Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee before: COMBA TELECOM SYSTEMS (CHINA) Ltd. |
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