CN101834824B - Multicarrier filtration method, multicarrier filtration system and repeater - Google Patents
Multicarrier filtration method, multicarrier filtration system and repeater Download PDFInfo
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Abstract
The invention provides a multicarrier filtration method, a multicarrier filtration system and a repeater, which are suitable for the field of communications. The multicarrier filtration method comprises the following steps of: using a plurality of continuous carrier waves as a subband by a control module to obtain carrier frequency, carrier quantity and subband quantity; determining the center frequency of the subband according to the carrier frequency and the carrier quantity; distributing corresponding subband passband width and subband stop-band width to the subband according to the passband width and the stop-band width of the carrier waves in the subband and the carrier quantity; determining channel bandwidth of the subband; moving the center frequency of the subband to zero frequency by a lower frequency conversion module; carrying out corresponding multiple filtration extraction on the subband by a filtration extraction module; and carrying out channel filtration by a channel filtration module according to the corresponding subband passband width and the corresponding subband stop-band width distributed by the control module and the determined channel bandwidth of the subband. The multicarrier filtration method, the multicarrier filtration system and the repeater can save resources, reduce filtration step number, shorten time delay and satisfy higher index requirements.
Description
Technical field
The invention belongs to the communications field, relate in particular to a kind of multicarrier filtering method, system and repeater thereof.
Background technology
At present; Along with the continuous growth that the data of communication system are used, the multicarrier filtering technique has become a research focus, especially excessively is with narrow at intercarrier; Under the situation of resource-constrained; The exponent number of the filtration module that need adopt in the common multicarrier filtering method is very high, and it is longer to delay time, and has satisfied not higher index request.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of processing method of multi-carrier digital intermediate-freuqncy signal; The exponent number that is intended to solve the filtration module that needs employing in the multicarrier filtering method common in the prior art is very high; It is longer to delay time, and has satisfied not the problem of higher index request.
The embodiment of the invention is achieved in that a kind of multicarrier filtering method, said method comprising the steps of:
Control module with continuous a plurality of carrier waves as a subband; And obtain the quantity of carrier frequency, number of carriers and subband; Confirm the centre frequency of subband according to the carrier frequency of obtaining and number of carriers; Give corresponding subband pass band width of allocation of subbands and subband bandwidth of rejection according to pass band width, the bandwidth of rejection of carrier wave in the subband and the number of carriers that comprises, and the channel width of definite subband;
Down conversion module is moved the centre frequency of subband on the zero-frequency;
Filtering extraction module antithetical phrase band carries out the filtering extraction of corresponding multiple;
The corresponding subband pass band width that the channel filtering module is distributed according to said control module, subband bandwidth of rejection reach the channel width of the subband of confirming and carry out channel filtering;
Filtering interpolation module antithetical phrase band carries out the filtering interpolation of said corresponding multiple;
The up-conversion module is moved the centre frequency of subband on the original frequency from zero-frequency.
The embodiment of the invention also provides a kind of multicarrier filtering system, and said system comprises:
Control module; Be used for continuous a plurality of carrier waves as a subband; And obtain the quantity of carrier frequency, number of carriers and subband; Confirm the centre frequency of subband according to the carrier frequency of obtaining and number of carriers, give corresponding subband pass band width of allocation of subbands and subband bandwidth of rejection according to pass band width, the bandwidth of rejection of carrier wave in the subband and the number of carriers that comprises, and the channel width of definite subband;
Down conversion module is used for the centre frequency of subband is moved zero-frequency;
The filtering extraction module is used for the filtering extraction that the antithetical phrase band carries out corresponding multiple;
The channel filtering module, the channel width that is used for corresponding subband pass band width, subband bandwidth of rejection of distributing according to said control module and the subband of confirming is carried out channel filtering to subband;
The filtering interpolation module is used for the filtering interpolation that the antithetical phrase band carries out said corresponding multiple;
The up-conversion module is used for the centre frequency of subband is moved original frequency from zero-frequency.
The embodiment of the invention compared with prior art, beneficial effect is: through with continuous a plurality of carrier waves as a subband, give corresponding subband pass band width of allocation of subbands and subband bandwidth of rejection according to pass band width, the bandwidth of rejection of carrier wave in the subband and the number of carriers that comprises; And the channel width of definite subband; Carry out channel filtering, can save resource, reduce the filtering exponent number; Shorten time-delay, can satisfy higher index request.
Description of drawings
Fig. 1 is the flow chart of a kind of multicarrier filtering method of providing of the embodiment of the invention;
An exemplary plot of the distribution of carriers in a kind of multicarrier filtering method that Fig. 2 provides for the embodiment of the invention;
Fig. 3 is the module frame chart of a kind of multicarrier filtering system of providing of the embodiment of the invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
In the embodiment of the invention, through with continuous a plurality of carrier waves as a subband, give corresponding subband pass band width of allocation of subbands and subband bandwidth of rejection according to pass band width, the bandwidth of rejection of carrier wave in the subband and the number of carriers that comprises; And the channel width of definite subband; Carry out channel filtering, can save resource, reduce the filtering exponent number; Shorten time-delay, can satisfy higher index request.
See also Fig. 1, the embodiment of the invention provides a kind of multicarrier filtering method, said method comprising the steps of:
S101: control module with continuous a plurality of carrier waves as a subband; And obtain the quantity of carrier frequency, number of carriers and subband; Confirm the centre frequency of subband according to the carrier frequency of obtaining and number of carriers; Give corresponding subband pass band width of allocation of subbands and subband bandwidth of rejection according to pass band width, the bandwidth of rejection of carrier wave in the subband and the number of carriers that comprises, and the channel width of definite subband;
S102: down conversion module is moved the centre frequency of subband on the zero-frequency;
S103: filtering extraction module antithetical phrase band carries out the filtering extraction of corresponding multiple;
S104: the corresponding subband pass band width that the channel filtering module is distributed according to said control module, subband bandwidth of rejection reach the channel width of the subband of confirming and carry out channel filtering;
S105: filtering interpolation module antithetical phrase band carries out the filtering interpolation of said corresponding multiple;
S106: the up-conversion module is moved the centre frequency of subband on the original frequency from zero-frequency.
In an embodiment of the present invention, said step S103 is specially:
The filtering extraction module is carried out the filtering extraction of corresponding multiple to low rate by two-forty to subband.
In an embodiment of the present invention, said step S105 is specially:
The filtering interpolation module is carried out the filtering interpolation of said corresponding multiple to said two-forty by said low rate to subband.
In an embodiment of the present invention, further comprising the steps of before the said step S102:
Quantity and the subband pass band width of subband and the one-to-one relationship of subband bandwidth of rejection of the continuous carrier that comprises in pass band width, bandwidth of rejection and the subband that module is provided with carrier wave in advance are set.
In an embodiment of the present invention, said pass band width according to carrier wave in the subband, bandwidth of rejection and the number of carriers that comprises are given corresponding subband pass band width of allocation of subbands and subband bandwidth of rejection, and the step of the channel width of definite subband is specially:
According to pass band width, the bandwidth of rejection of carrier wave in the subband and the number of carriers that comprises; Quantity and the subband pass band width of subband and the one-to-one relationship of subband bandwidth of rejection according to the continuous carrier that comprises in pass band width, bandwidth of rejection and the subband that the carrier wave that module is provided with in advance is set; Give corresponding subband pass band width of allocation of subbands and subband bandwidth of rejection, and the channel width of definite subband.
In an embodiment of the present invention, said control module specifically can be single-chip microcomputer.
In an embodiment of the present invention, in step S101,
If the pass band width of carrier wave is a, bandwidth of rejection is b;
When subband comprises a continuous carrier wave, can be respectively for the corresponding subband pass band width and the subband bandwidth of rejection of allocation of subbands: a, 2b;
When subband comprises two continuous carrier waves, can be respectively for the corresponding subband pass band width and the subband bandwidth of rejection of allocation of subbands: 2a, b+2a;
When subband comprises three continuous carrier waves, can be respectively for the corresponding subband pass band width and the subband bandwidth of rejection of allocation of subbands: a+2b, 3b+a;
When subband comprises four continuous carrier waves, can be respectively for the corresponding subband pass band width and the subband bandwidth of rejection of allocation of subbands: 2b+2a, 3b+2a;
When subband comprises five continuous carrier waves, can be respectively for the corresponding subband pass band width and the subband bandwidth of rejection of allocation of subbands: 4b+a, 5b+a;
When subband comprises six continuous carrier waves, can be respectively for the corresponding subband pass band width and the subband bandwidth of rejection of allocation of subbands: 5b+a, 6b+a.
In an embodiment of the present invention, the b value is greater than a value, can and the like, give corresponding subband pass band width of allocation of subbands and subband bandwidth of rejection.
In an embodiment of the present invention; Since with continuous a plurality of carrier waves as a subband; Channel width can be carried out in good time adjustment according to pass band width, the bandwidth of rejection of carrier wave in the subband and the number of carriers that comprises, thereby can save resource, reduces the filtering exponent number; Shorten time-delay, can satisfy higher index request.
Existing to be example with the CDMA6 carrier wave describe the step of the embodiment of the invention, if existing C DMA6 carrier wave utilizes AD chip 61.44MHZ/S sampling.
Each carrier bandwidths of current C DMA6 carrier wave is 1.23M, and the dedicated bandwidth that has of signal is 1.2288M, and six carrier waves are respectively in the 10M bandwidth; If according to traditional filtering mode, channel filtering is used matlab emulation, if the speed of channel filtering is 3.84M; Signal passband is 0.61144M, and stopband is 0.615M, and the exponent number of the filtration module that will adopt so will reach thousands of rank; It is huge to delay time, and is difficult to realize.
And the multicarrier filtering method of the employing embodiment of the invention; If six carrier waves are as shown in Figure 2; Wherein, first carrier, second carrier wave are continuous carrier wave, and the 3rd carrier wave does not have continuous carrier wave; The 4th carrier wave, the 5th carrier wave and the 6th carrier wave are continuous carrier wave, and the frequency of first carrier, second carrier wave, the 3rd carrier wave, the 4th carrier wave, the 5th carrier wave and the 6th carrier wave is respectively fl, f2, f3, f4, f5 and f6.
Therefore, in the step S102 of the embodiment of the invention, can be with first carrier, second carrier wave as first subband, the 3rd carrier wave is as second subband, and the 4th carrier wave, the 5th carrier wave and the 6th carrier wave are as the 3rd subband.The centre frequency of first subband is that the centre frequency of (f1+f2)/2, the second subband is f3, and the centre frequency of the 3rd subband is f5.
In the step S103 of the embodiment of the invention; For example take to be extracted into four times of extractions of 15.36MHZ/S from 61.44MHZ/S; Because the CDMA6 distribution of carriers is in the 10M bandwidth, so can be set at the passband of the filtering extraction module of step S102 filtering extraction that 5M, stopband can be set to 10.36M, passband fluctuation can be set to 0.1M and the stopband rejection ratio can be set to 80.
In an embodiment of the present invention, corresponding multiple can suitable according to actual needs selecting.
In the step S104 of the embodiment of the invention; Have six carrier waves in the CDMA6 carrier wave; So corresponding CDMA6 carrier wave; Its subband then has six kinds of modes, promptly comprise 1 continuous carrier subband, comprise 2 continuous carriers subband, comprise 3 continuous carriers subband, comprise 4 continuous carriers subband, comprise 5 continuous carriers subband, comprise the subband of 6 continuous carriers.Thereby channel filtering has six kinds of bandwidth, because the roll-off factor of filtration module is identical, so exponent number is identical.The parameter of the channel filtering module that adopts in the channel filtering can be provided with reference to table one.
Table one:
Because each carrier bandwidths of CDMA6 is 1.23M, the dedicated bandwidth that has of signal is 1.2288M, so through the step S104 of the embodiment of the invention, the passband of subband that can continuous 1 carrier wave is set to 1.2288M/2, stopband is set to 1.23M; The passband of the subband of continuous two carrier waves is set to 1.2288M, and stopband is set to 1.23M/2+1.2288M; The passband of the subband of continuous three carrier waves is set to 1.23M+1.2288M/2, and stopband is set to 1.23M*3/2+1.2288M/2; The passband of the subband of continuous four carrier waves is set to 1.23M+1.2288M, and stopband is set to 1.23M*3/2+1.2288M; The passband of the subband of continuous five carrier waves is set to 1.23M*2+1.2288M/2, and stopband is set to 1.23M*5/2+1.288M/2; The passband of the subband of continuous six carrier waves is set to 1.23M*5/2+1.288M/2, and stopband is set to 1.23M*3+1.2288M/2.Wherein, passband fluctuation and stopband rejection ratio can corresponding setting be 0.3 and 70.
In the step S105 of the embodiment of the invention; Then corresponding step S103; Be extracted into four times of interpolation of 61.44MHZ/S from 15.36MHZ/S, because the CDMA6 distribution of carriers is in the 10M bandwidth, so can be designed to the 10M bandwidth in the filtering interpolation module of step S105 filtering interpolation; Guaranteed the combination in any mode of 6 carrier waves like this, the passband of filtering interpolation module is set to 10.36M for being set to 5M, stopband, passband fluctuation is set to 0.1M and the stopband rejection ratio is set to 80.
Because the CDMA6 distribution of carriers is in the 10M bandwidth, so be that 5M, stopband are that 10.36M, passband fluctuation are that 0.1M and stopband rejection ratio are that 80 filtering extraction module is carried out filtering extraction through being designed to passband at step S102.
In an embodiment of the present invention, can be according to the variation adaptive channel filtering of carrier wave.In this example, the channel filtering module that adopts in the channel filtering can design six systems that exponent number is identical, thereby can save resource, reduces the filtering exponent number, shortens time-delay, can satisfy higher index request.
See also Fig. 3, the embodiment of the invention provides a kind of multicarrier filtering system, and said system comprises:
Down conversion module 302 is used for the centre frequency of subband is moved zero-frequency;
Up-conversion module 306 is used for the centre frequency of subband is moved original frequency from zero-frequency.
In an embodiment of the present invention, said filtering extraction module 303 specifically is used for subband is carried out to low rate by two-forty the filtering extraction of corresponding multiple;
Said filtering interpolation module 305 specifically is used for subband is carried out to said two-forty by said low rate the filtering interpolation of said corresponding multiple.
In an embodiment of the present invention, said control module specifically can be single-chip microcomputer.
In an embodiment of the present invention, system also comprises:
Module is set, is used for being provided with in advance quantity and the subband pass band width of subband and the one-to-one relationship of subband bandwidth of rejection of the continuous carrier that pass band width, bandwidth of rejection and the subband of carrier wave comprise.
Said control module 301; Specifically be used for continuous a plurality of carrier waves as a subband; And obtain the quantity of carrier frequency, number of carriers and subband; Confirm the centre frequency of subband according to the carrier frequency of obtaining and number of carriers; According to pass band width, the bandwidth of rejection of carrier wave in the subband and the number of carriers that comprises and said quantity and the subband pass band width of subband and the one-to-one relationship of subband bandwidth of rejection of the continuous carrier that comprises in pass band width, bandwidth of rejection and the subband of the carrier wave that module is provided with in advance are set, give corresponding subband pass band width of allocation of subbands and subband bandwidth of rejection, and the channel width of definite subband.
Through with continuous a plurality of carrier waves as a subband, quantity and the subband pass band width of subband and the one-to-one relationship of subband bandwidth of rejection of the continuous carrier that comprises in pass band width, bandwidth of rejection and the subband according to the carrier wave that is provided with in advance are to corresponding subband pass band width of allocation of subbands and subband bandwidth of rejection; And the channel width of definite subband; Carry out channel filtering, can save resource, reduce the filtering exponent number; Shorten time-delay, can satisfy higher index request.
The embodiment of the invention also provides a kind of repeater, and said repeater comprises described multicarrier filtering system.
Multicarrier filtering method of the present invention, system and repeater, through with continuous a plurality of carrier waves as a subband, give corresponding subband pass band width of allocation of subbands and subband bandwidth of rejection according to pass band width, the bandwidth of rejection of carrier wave in the subband and the number of carriers that comprises; And the channel width of definite subband; Carry out channel filtering, can save resource, reduce the filtering exponent number; Shorten time-delay, can satisfy higher index request.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a multicarrier filtering method is characterized in that, said method comprising the steps of:
Control module with continuous a plurality of carrier waves as a subband; And obtain the quantity of carrier frequency, number of carriers and subband; Confirm the centre frequency of subband according to the carrier frequency of obtaining and number of carriers; Give corresponding subband pass band width of allocation of subbands and subband bandwidth of rejection according to pass band width, the bandwidth of rejection of carrier wave in the subband and the number of carriers that comprises, and the channel width of definite subband;
Down conversion module is moved the centre frequency of subband on the zero-frequency;
Filtering extraction module antithetical phrase band carries out the filtering extraction of corresponding multiple;
The corresponding subband pass band width that the channel filtering module is distributed according to said control module, subband bandwidth of rejection reach the channel width of the subband of confirming and carry out channel filtering;
Filtering interpolation module antithetical phrase band carries out the filtering interpolation of said corresponding multiple;
The up-conversion module is moved the centre frequency of subband on the original frequency from zero-frequency.
2. multicarrier filtering method as claimed in claim 1 is characterized in that, the step that said filtering extraction module antithetical phrase band carries out the filtering extraction of corresponding multiple is specially:
The filtering extraction module is carried out the filtering extraction of corresponding multiple to low rate by two-forty to subband.
3. multicarrier filtering method as claimed in claim 2 is characterized in that, the step that said filtering interpolation module antithetical phrase band carries out the filtering interpolation of said corresponding multiple is specially:
The filtering interpolation module is carried out the filtering interpolation of said corresponding multiple to said two-forty by said low rate to subband.
4. multicarrier filtering method as claimed in claim 1; It is characterized in that; The pass band width of carrier wave, bandwidth of rejection and the number of carriers that comprises are given corresponding subband pass band width of allocation of subbands and subband bandwidth of rejection in according to subband, and further comprising the steps of before the step of the channel width of definite subband:
Quantity and the subband pass band width of subband and the one-to-one relationship of subband bandwidth of rejection of the continuous carrier that comprises in pass band width, bandwidth of rejection and the subband that module is provided with carrier wave in advance are set.
5. multicarrier filtering method as claimed in claim 4; It is characterized in that; Said pass band width according to carrier wave in the subband, bandwidth of rejection and the number of carriers that comprises are given corresponding subband pass band width of allocation of subbands and subband bandwidth of rejection, and the step of the channel width of definite subband is specially:
According to pass band width, the bandwidth of rejection of carrier wave in the subband and the number of carriers that comprises; Quantity and the subband pass band width of subband and the one-to-one relationship of subband bandwidth of rejection according to the continuous carrier that comprises in pass band width, bandwidth of rejection and the subband that the carrier wave that module is provided with in advance is set; Give corresponding subband pass band width of allocation of subbands and subband bandwidth of rejection, and the channel width of definite subband.
6. a multicarrier filtering system is characterized in that, said system comprises:
Control module; Be used for continuous a plurality of carrier waves as a subband; And obtain the quantity of carrier frequency, number of carriers and subband; Confirm the centre frequency of subband according to the carrier frequency of obtaining and number of carriers, give corresponding subband pass band width of allocation of subbands and subband bandwidth of rejection according to pass band width, the bandwidth of rejection of carrier wave in the subband and the number of carriers that comprises, and the channel width of definite subband;
Down conversion module is used for the centre frequency of subband is moved zero-frequency;
The filtering extraction module is used for the filtering extraction that the antithetical phrase band carries out corresponding multiple;
The channel filtering module, the channel width that is used for corresponding subband pass band width, subband bandwidth of rejection of distributing according to said control module and the subband of confirming is carried out channel filtering to subband;
The filtering interpolation module is used for the filtering interpolation that the antithetical phrase band carries out said corresponding multiple;
The up-conversion module is used for the centre frequency of subband is moved original frequency from zero-frequency.
7. multicarrier filtering system as claimed in claim 6 is characterized in that,
Said filtering extraction module specifically is used for subband is carried out to low rate by two-forty the filtering extraction of corresponding multiple;
Said filtering interpolation module specifically is used for subband is carried out to said two-forty by said low rate the filtering interpolation of said corresponding multiple.
8. multicarrier filtering system as claimed in claim 6 is characterized in that, said system also comprises:
Module is set, is used for being provided with in advance quantity and the subband pass band width of subband and the one-to-one relationship of subband bandwidth of rejection of the continuous carrier that pass band width, bandwidth of rejection and the subband of carrier wave comprise.
9. multicarrier filtering system as claimed in claim 8 is characterized in that,
Said control module; Specifically be used for continuous a plurality of carrier waves as a subband; And obtain the quantity of carrier frequency, number of carriers and subband; Confirm the centre frequency of subband according to the carrier frequency of obtaining and number of carriers; According to pass band width, the bandwidth of rejection of carrier wave in the subband and the number of carriers that comprises and said quantity and the subband pass band width of subband and the one-to-one relationship of subband bandwidth of rejection of the continuous carrier that comprises in pass band width, bandwidth of rejection and the subband of the carrier wave that module is provided with in advance are set, give corresponding subband pass band width of allocation of subbands and subband bandwidth of rejection, and the channel width of definite subband.
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| CN102098063A (en) * | 2010-12-30 | 2011-06-15 | 中兴通讯股份有限公司 | Method and device for processing transmission of different bandwidth signals in wireless communication system |
| CN103368888B (en) * | 2012-03-29 | 2016-04-06 | 京信通信系统（中国）有限公司 | A kind of IF signal processing method and device |
| WO2016119440A1 (en) | 2015-01-30 | 2016-08-04 | 华为技术有限公司 | Sub-band resource determining device and method |
| CN108270416B (en) * | 2016-12-30 | 2021-09-03 | 中电长城圣非凡信息系统有限公司 | High-order interpolation filter and method |
| CN107454034A (en) * | 2017-09-13 | 2017-12-08 | 中国电子科技集团公司第四十研究所 | A kind of F OFDM modulation methods and device suitable for 5G systems |
| CN110190865B (en) * | 2019-07-24 | 2019-10-15 | 翱捷科技(上海)有限公司 | A kind of reception system and method for Internet of Things narrow band signal |
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| CN101040503A (en) * | 2004-01-21 | 2007-09-19 | 高通股份有限公司 | Pilot transmission and channel estimation for an OFDM system with excess delay spread |
| CN101138214A (en) * | 2004-12-13 | 2008-03-05 | 弗劳恩霍夫应用研究促进协会 | Signal converter for converting a start signal into a final signal and method for converting a start signal into an end signal |
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| CN101040503A (en) * | 2004-01-21 | 2007-09-19 | 高通股份有限公司 | Pilot transmission and channel estimation for an OFDM system with excess delay spread |
| CN101138214A (en) * | 2004-12-13 | 2008-03-05 | 弗劳恩霍夫应用研究促进协会 | Signal converter for converting a start signal into a final signal and method for converting a start signal into an end signal |
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