CN103368888A - Intermediate frequency signal processing method and intermediate frequency signal processing apparatus - Google Patents
Intermediate frequency signal processing method and intermediate frequency signal processing apparatus Download PDFInfo
- Publication number
- CN103368888A CN103368888A CN2012100889986A CN201210088998A CN103368888A CN 103368888 A CN103368888 A CN 103368888A CN 2012100889986 A CN2012100889986 A CN 2012100889986A CN 201210088998 A CN201210088998 A CN 201210088998A CN 103368888 A CN103368888 A CN 103368888A
- Authority
- CN
- China
- Prior art keywords
- band
- frequency sub
- frequency
- signal
- freuqncy signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000012545 processing Methods 0.000 title claims abstract description 123
- 238000003672 processing method Methods 0.000 title claims abstract description 15
- 238000001914 filtration Methods 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims description 119
- 230000008569 process Effects 0.000 claims description 83
- 238000005516 engineering process Methods 0.000 claims description 25
- 230000015572 biosynthetic process Effects 0.000 claims description 21
- 238000003786 synthesis reaction Methods 0.000 claims description 20
- 238000000465 moulding Methods 0.000 claims description 16
- 238000005070 sampling Methods 0.000 claims description 12
- 238000009432 framing Methods 0.000 claims description 5
- 230000007704 transition Effects 0.000 claims description 3
- 238000004148 unit process Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 10
- 238000007493 shaping process Methods 0.000 abstract description 3
- 238000004891 communication Methods 0.000 description 15
- 230000005540 biological transmission Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 230000008859 change Effects 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 230000009467 reduction Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005055 memory storage Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses an intermediate frequency signal processing method and an intermediate frequency signal processing apparatus. The intermediate frequency signal processing method comprises the steps of adopting a frequency sub-band dividing mode, and determining frequency sub-bands in work frequency bands, wherein all intermediate frequency signals received in preset work frequency bands are placed in the frequency sub-bands in the work frequency bands; subjecting the intermediate frequency signal in each determined frequency sub-band to frequency sub-band down conversion processing operation, digital shaping wave-filtering processing operation and frequency sub-band up conversion processing operation; subjecting each processed intermediate frequency signal to combination processing operation, and obtaining intermediate frequency signals corresponding to the preset work frequency bands. By adopting the technical solution brought forward in the invention, system compatibility can be well improved, and cost of system resources can be lowered.
Description
Technical field
The present invention relates to digital signal processing technique field, especially relate to a kind of intermediate-freuqncy signal processing method and device.
Background technology
In mobile communication system, for weak signal area, blind area, the outlying district that cordless communication network covers, adopting the repeater is a kind of low cost, efficient solution as relaying.
The repeater is in the default working frequency range by operator, the interior radiofrequency signal of working frequency range is preset in dropping on that send the reception base station, and with the radiofrequency signal process frequency-conversion processing that receives, obtain the intermediate-freuqncy signal in the corresponding band, then adopt software and radio technique to carry out conversion and processing through the intermediate-freuqncy signal after the digitized processing, be converted to digital baseband signal.Wherein, intermediate-freuqncy signal refers to that center frequency point is the signal transmission of frequency range mid point, is comprised of center frequency point, upper side band signal and lower sideband signal.As shown in Figure 1, suppose that the transmission band that signal to be transmitted takies is B, then center frequency point is that the signal transmission of frequency range B mid point is intermediate-freuqncy signal, i.e. the center frequency point f of this intermediate-freuqncy signal
0=B/2, the left side band frequency values of frequency range B is f
1Signal be referred to as lower sideband signal, the right band frequency values of frequency range B is f
2Signal be referred to as upper side band signal.
In the prior art, adopt the repeater as the communication system of relaying, when intermediate-freuqncy signal is transmitted, need to remove frequently and process, in removing the frequency processing procedure, need to intermediate-freuqncy signal identical for frequency range, that center frequency point is identical distribute a digital processing link, then in the digital processing link that distributes, the intermediate-freuqncy signal of this frequency range is removed frequently processing, be specially (with reference to Fig. 1): with the center frequency point f of intermediate-freuqncy signal 101
0The intermediate-freuqncy signal 102 of moving to zero-frequency and after will moving is carried out orthogonalization process, and the intermediate-freuqncy signal after the orthogonalization process is carried out respectively upconversion process and filtering processing, is converted to afterwards transmission of digital baseband signal.But the evolution along with technology, communication products are transitioned into the multimode product by the single mode product gradually, namely in adopting the communication system of repeater as relaying, the incomplete same intermediate-freuqncy signal of transmission band that in each default working frequency range, have a plurality of center frequency point, takies, and the transmission band that each intermediate-freuqncy signal takies not is very large, and the center frequency point and the frequency range that namely drop on a plurality of intermediate-freuqncy signals in the default working frequency range are diversified.Because in adopting the communication system of repeater as relaying, pre-assigned digital processing link can only the processing center frequency and the transmission band intermediate-freuqncy signal of all fixing, and can not process other center frequency point difference or the different intermediate-freuqncy signal of frequency range.If need to process other intermediate-freuqncy signal, then need to adopt multichannel technology to realize, be different intermediate-freuqncy signals and distribute different digital processing links.
From the above, the method for in the prior art intermediate-freuqncy signal being processed, compatible relatively poor, and resource overhead is also larger.
Summary of the invention
The embodiment of the invention provides a kind of intermediate-freuqncy signal processing method and device, can improve preferably the compatibility of system, the expense of reduction system resource.
The technical scheme that the embodiment of the invention provides is as follows:
A kind of intermediate-freuqncy signal processing method comprises: adopt the frequency sub-band dividing mode, determine to preset the interior frequency sub-band of described working frequency range at each intermediate-freuqncy signal place of receiving in the working frequency range; Respectively the intermediate-freuqncy signal in each frequency sub-band of determining is carried out frequency sub-band down-converted, the processing of digital molding filtration and frequency sub-band upconversion process; Each intermediate-freuqncy signal after processing is closed the road process, obtain default intermediate-freuqncy signal corresponding to working frequency range.
A kind of signal process unit of intermediate frequency comprises: determining unit, be used for adopting the frequency sub-band dividing mode, and determine to preset the interior frequency sub-band of described working frequency range at each intermediate-freuqncy signal place of receiving in the working frequency range; The frequency sub-band processing unit is used for respectively the intermediate-freuqncy signal in each definite frequency sub-band of determining unit being carried out frequency sub-band down-converted, the processing of digital molding filtration and frequency sub-band upconversion process; Close the road processing unit, be used for that each intermediate-freuqncy signal after the frequency sub-band processing unit processes is closed the road and process, obtain default intermediate-freuqncy signal corresponding to working frequency range.
Adopt technique scheme, whole intermediate-freuqncy signals of receiving in the default working frequency range are divided into the intermediate-freuqncy signal of a plurality of frequency sub-band, then adopt a digital processing link, respectively the intermediate-freuqncy signal in each frequency sub-band after dividing is carried out respective handling, each frequency sub-band intermediate-freuqncy signal after will processing is at last closed the road and is processed, like this, can realize in a digital processing link, the intermediate-freuqncy signal of a plurality of centre frequencies and bandwidth be can process respectively, and then the compatibility of system, the expense of reduction system resource improved preferably.
Description of drawings
Fig. 1 is in the prior art, the intermediate-freuqncy signal schematic diagram in the default working frequency range of a digital processing processing of circuit of proposition;
Fig. 2 is in the embodiment of the invention one, a kind of intermediate-freuqncy signal process flow figure of proposition;
Fig. 3 is in the embodiment of the invention one, and the intermediate-freuqncy signal that drops in the default working frequency range of proposition forms schematic diagram;
Fig. 4 is in the embodiment of the invention one, proposition for carrying out after the down-converted of broadband center frequency point f0 moved the schematic diagram to the zero-frequency;
Fig. 5 is in the embodiment of the invention one, and the frequency sub-band of proposition is divided the processing procedure schematic diagram;
Fig. 6 is in the embodiment of the invention two, a kind of signal process unit of intermediate frequency structure chart of proposition;
Fig. 7 a is in the embodiment of the invention three, the processing procedure schematic diagram of the intermediate-freuqncy signal downlink communication link in the default working frequency range in the repeater of proposition;
Fig. 7 b is in the embodiment of the invention three, the processing procedure schematic diagram of the intermediate-freuqncy signal uplink communication link in the default working frequency range in the repeater of proposition;
Fig. 8 is in the embodiment of the invention three, the schematic diagram of processing determining the frequency sub-band intermediate-freuqncy signal of proposition;
Fig. 9 is in the embodiment of the invention three, the calculation of parameter of proposition and storage schematic diagram;
Figure 10 is in the embodiment of the invention three, the schematic diagram after the intermediate-freuqncy signal handling process of proposition changes.
Embodiment
For exist in the prior art intermediate-freuqncy signal is processed the time, system compatible relatively poor and the problem that system resource overhead is larger, the technical scheme that the embodiment of the invention proposes here, mode by the frequency sub-band division, determine the interior frequency sub-band of working frequency range at each intermediate-freuqncy signal place of receiving in the default working frequency range, then respectively the intermediate-freuqncy signal in each frequency sub-band of determining is carried out the frequency sub-band down-converted, the numeral molding filtration is processed and the frequency sub-band upconversion process, make the intermediate-freuqncy signal in each frequency sub-band become independently intermediate-freuqncy signal, each intermediate-freuqncy signal after will processing is at last closed the road and is processed, and obtains default intermediate-freuqncy signal corresponding to working frequency range.Like this, can be in a digital processing link, process respectively the intermediate-freuqncy signal of dissimilar bandwidth, and can configure flexibly according to center frequency point and the bin width value of each frequency sub-band intermediate-freuqncy signal, can improve preferably the compatibility of system, the expense of reduction system resource.
Need to prove, method and device that intermediate-freuqncy signal is processed that various embodiments of the present invention propose here, being based on a digital processing link is that example is described in detail, in the design and application of reality, the basic principle that can propose here based on various embodiments of the present invention, design more digital processing link, make different digital processing links can process flexibly the intermediate-freuqncy signal of each frequency range, thereby so that all intermediate-freuqncy signals that drop in the default working frequency range all can obtain respective handling, and then whole communication system is applicable in the different scene of various working frequency range, thereby make system have very strong compatibility, and, in the multimode product, in the situation that the multimode communication signal coexistence, the technical scheme that adopts various embodiments of the present invention to propose here can alleviate the transmission pressure of signal preferably.
At length set forth to the main realization principle of embodiment of the invention technical scheme, embodiment and to the beneficial effect that should be able to reach below in conjunction with each accompanying drawing.
Embodiment one:
The embodiment of the invention one proposes a kind of intermediate-freuqncy signal processing method here.Need to prove, the intermediate-freuqncy signal processing method that the embodiment of the invention one proposes here, can process the intermediate-freuqncy signal of down link in the communication system, also can process the intermediate-freuqncy signal of up link in the communication system, its concrete processing procedure is identical, as shown in Figure 2, its concrete processing procedure is as follows:
As shown in Figure 4, through the intermediate-freuqncy signal after the down-converted of broadband, the center frequency point of whole intermediate-freuqncy signal and whole passband all have been moved to the left f0, namely make all as a whole intermediate-freuqncy signals after carrying out the broadband down-converted, center frequency point is moved to zero-frequency (place at zero point of transverse axis ω).And after the filtering that all intermediate-freuqncy signals after carrying out the broadband down-converted is reduced signal sampling rate is processed, can be in the sample rate of the situation decline low signal of the center frequency point that does not change each intermediate-freuqncy signal and bin width, namely reduced the follow-up signal that needs transmission, and do not affect the recovery of intermediate-freuqncy signal in subsequent processes, thereby alleviated the transmission pressure of intermediate-freuqncy signal when carrying out the CPRI transmission.
As shown in Figure 5, the embodiment of the invention one elaborates frequency sub-band and divides processing procedure here take 4 intermediate-freuqncy signals as example.Each intermediate-freuqncy signal for dropping in the default working frequency range has the bin width corresponding with it and center frequency point information.So when determining each frequency sub-band intermediate-freuqncy signal, frequency sub-band width value and frequency sub-band center frequency point that can be corresponding according to each intermediate-freuqncy signal determine respectively to preset the interior frequency sub-band of described working frequency range at each intermediate-freuqncy signal place of receiving in the working frequency range.
Particularly, can but be not limited to adopt following two kinds of methods to determine the frequency sub-band width value of each intermediate-freuqncy signal of receiving in the default working frequency range:
First method: because frequency sub-band width corresponding to each intermediate-freuqncy signal is changeless, so can take predefined mode, preset the width value of each frequency sub-band.
Second method: according to default frequency sub-band minimum widith value and Breadth Maximum value, and default step value is determined the width value of each frequency sub-band.Particularly, can adopt following formula 1 to determine the frequency sub-band width value:
B=B
Min+ n * Δ b, n=0,1 ... N-1; N=(B
Max-B
Min)/Δ b formula 1
Wherein, B is the width value of the frequency sub-band determined, B
MinThe minimum widith value of frequency sub-band to be divided, B
MaxBe the Breadth Maximum value of frequency sub-band to be divided, Δ b is the step value of presetting.
Particularly, satisfy the frequency sub-band width value determine less than or equal to default working frequency range width value scope in, default step value Δ b can but to be not limited to be a fixing numerical value, also can be the numerical value according to the preset rules variation.For example, the concrete value of Δ b can but to be not limited to be that rule according to certain increases progressively gradually, perhaps successively decrease gradually according to certain rule, or according to the certain multiple relationship change.
Adopt the above-mentioned second way to determine the frequency sub-band width value, for the less system of digital processing link, use a digital processing link, the intermediate-freuqncy signal width value that guarantees each frequency sub-band is to increase or reduce with predefined step value, just can process the intermediate-freuqncy signal of number of different types.
Preferably, can carry out smoothly in follow-up processing procedure for guaranteeing each frequency sub-band of determining, the embodiment of the invention one is separated with default transition frequency range, Δ B as shown in Figures 4 and 5 here between between each frequency sub-band of determining.
Wherein, when the intermediate-freuqncy signal of each frequency sub-band of determining is carried out down-converted, for each frequency sub-band, adopt direct digital frequency synthesis technology, generate sinusoidal signal and the cosine signal identical with the interior intermediate-freuqncy signal frequency of this frequency sub-band, then according to the sinusoidal signal and the cosine signal that generate the intermediate-freuqncy signal in the corresponding frequency sub-band is modulated, the intermediate-freuqncy signal center frequency point in the corresponding frequency sub-band is moved to the zero-frequency position.For example, center frequency point as shown in Figure 5 is f1, the frequency sub-band width value is that the intermediate-freuqncy signal of B1 is when carrying out down-converted, at first adopt direct digital frequency synthesis technology, (center frequency point that frequency is identical is f1 to the intermediate-freuqncy signal of generated frequency and this frequency sub-band, the frequency sub-band width value is B1) sinusoidal signal and cosine signal, then be that the intermediate-freuqncy signal of f1 is modulated according to the sinusoidal signal that generates and cosine signal to center frequency point, the center frequency point f1 of this intermediate-freuqncy signal is moved to the zero-frequency position.That f2, frequency sub-band width value are B2 for center frequency point, center frequency point is that f3, frequency sub-band width value are B3, center frequency point is that f4, frequency sub-band width value are the intermediate-freuqncy signal of B4, and also carrying out similar center frequency point is that f1, frequency sub-band width value are the respective handling process of the intermediate-freuqncy signal of B1
For the intermediate-freuqncy signal in each frequency sub-band that carries out after the down-converted, the combine digital molding filtration is processed respectively, with the sideband spurious signal filtering of each frequency sub-band, makes the intermediate-freuqncy signal of each frequency sub-band become independently intermediate-freuqncy signal (as shown in Figure 5).To each intermediate-freuqncy signal of frequency sub-band independently that forms, carry out the frequency sub-band upconversion process.Be specially: for the intermediate-freuqncy signal in the frequency sub-band, adopt direct digital frequency synthesis technology, generate sinusoidal signal and the cosine signal identical with the intermediate-freuqncy signal frequency of this frequency sub-band, then according to the sinusoidal signal and the cosine signal that generate the intermediate-freuqncy signal in this frequency sub-band is modulated, the center frequency point of the intermediate-freuqncy signal in this frequency sub-band is moved to carrying out down-converted position before.For example, as shown in Figure 5, that f1, bin width value are that the intermediate-freuqncy signal of B1 is when carrying out the frequency sub-band upconversion process for center frequency point, adopt direct digital frequency synthesis technology, generate sinusoidal signal and the cosine signal identical with this intermediate-freuqncy signal frequency, then being that f1, bin width value are that the intermediate-freuqncy signal of B1 is modulated according to the sinusoidal signal that generates and cosine signal to center frequency point, is that f1, bin width value are that the center frequency point of the intermediate-freuqncy signal of B1 is moved to the position of carrying out before the down-converted with center frequency point.Similarly, be respectively f2, B2 for center frequency point and bin width value, f3, B3, the intermediate-freuqncy signal of f4, B4, its processing procedure and center frequency point are f1, the upconversion process process of the intermediate-freuqncy signal of bin width value B1 is similar, repeats no more here.
Particularly, the intermediate-freuqncy signal of each frequency sub-band of determining is carried out the frequency sub-band down-converted, digital molding filtration is processed and the process of frequency sub-band upconversion process in, can in a digital processing link, process respectively the intermediate-freuqncy signal of the frequency sub-band of respectively determining, also can take full advantage of existing multichannel technology in the multimode product, adopt many digital processing links to process simultaneously the intermediate-freuqncy signal of each frequency sub-band of determining.
Preferably, be to improve the performance of intermediate-freuqncy signal, the filtering processing that the intermediate-freuqncy signal after can also involutory road processing improves signal sampling rate.
The technical scheme of the embodiment of the invention one above-mentioned proposition, can be in a digital processing link, process simultaneously the intermediate-freuqncy signal of dissimilar bandwidth, and can configure flexibly each frequency sub-band, can improve preferably the compatibility of system, the expense of reduction system resource.
Embodiment two:
The embodiment of the invention two proposes a kind of signal process unit of intermediate frequency here, as shown in Figure 6, comprising:
Determining unit 601 is used for adopting the frequency sub-band dividing mode, determines to preset the interior frequency sub-band of described working frequency range at each intermediate-freuqncy signal place of receiving in the working frequency range.
Particularly, above-mentioned determining unit 601, concrete being used for according to frequency sub-band width value and frequency sub-band center frequency point, the frequency sub-band in the described working frequency range at each intermediate-freuqncy signal place of receiving in the definite default working frequency range of employing frequency sub-band dividing mode.
Particularly, above-mentioned determining unit 601 specifically is used for according to default frequency sub-band minimum widith value and Breadth Maximum value, and default step value, determines the width value of frequency sub-band.
Particularly, described determining unit can adopt following formula to determine the frequency sub-band width value:
B＝B
min+n×Δb，n＝0，1，......N-1；N＝(B
max-B
min)/Δb
Wherein, B is the width value of the frequency sub-band determined, B
MinThe minimum widith value of frequency sub-band to be divided, B
MaxBe the minimum widith value of frequency sub-band to be divided, Δ b is the step value of presetting;
Frequency sub-band processing unit 602, the intermediate-freuqncy signal in each frequency sub-band that is used for respectively determining unit 601 is determined is carried out the frequency sub-band down-converted, digital molding filtration is processed and the frequency sub-band upconversion process.
Particularly, above-mentioned frequency sub-band processing unit 602, concrete being used for for a frequency sub-band, adopt direct digital frequency synthesis technology, generate sinusoidal signal and the cosine signal identical with this frequency sub-band frequency; And according to the sinusoidal signal and the cosine signal that generate the intermediate-freuqncy signal in this frequency sub-band is modulated, the intermediate-freuqncy signal center frequency point in this frequency sub-band is moved to the zero-frequency position.
Particularly, above-mentioned frequency sub-band processing unit 602, concrete being used for for a frequency sub-band, adopt direct digital frequency synthesis technology, generate sinusoidal signal and the cosine signal identical with the intermediate-freuqncy signal frequency of this frequency sub-band; And according to the sinusoidal signal and the cosine signal that generate the intermediate-freuqncy signal in this frequency sub-band is modulated, the intermediate-freuqncy signal center frequency point in each frequency sub-band is moved to the position of carrying out before the down-converted.
Close road processing unit 603, be used for that each intermediate-freuqncy signal after 602 processing of frequency sub-band processing unit is closed the road and process, obtain default intermediate-freuqncy signal corresponding to working frequency range.
Particularly, the above-mentioned road processing unit 603 that closes also is used for the filtering processing that the intermediate-freuqncy signal after process on involutory road improves signal sampling rate.
Wherein, above-mentioned signal process unit of intermediate frequency, also comprise the Wideband Signal Processing unit 604, be used for that all intermediate-freuqncy signals in the default working frequency range are carried out broadband down-converted, the filtering processing that reduces signal sampling rate, public radio interface CPRI framing and CPRI together and separate the frame processing.
The technical scheme of the embodiment of the invention two above-mentioned propositions, also can realize in a digital processing link, process simultaneously the intermediate-freuqncy signal of dissimilar bandwidth, and can configure flexibly each frequency sub-band, can improve preferably the compatibility of system, the expense of reduction system resource.
Embodiment three:
Further, on the basis of above-described embodiment one and embodiment two, the embodiment of the invention three is example here take the repeater, further describe the intermediate-freuqncy signal processing method.
Wherein, in adopting the communication system of repeater as relaying, there is default working frequency range each repeater when normal operation.Default working frequency range can be one, also can be a plurality of.And each working frequency range distributes fixing digital processing link to come alignment processing should preset signal in the working frequency range accordingly.The repeater can be processed the signal of down link in default working frequency range, shown in Fig. 7 a, also can process shown in Fig. 7 b the signal of up link.Wherein, in the processing procedure of down link, the identical standard at least one road that send reception base station, repeater or the radiofrequency signal of different systems, pass through analog-to-digital conversion, the radiofrequency signal that receives is treated to intermediate-freuqncy signal, then adopt the intermediate-freuqncy signal processing method of the embodiment of the invention one above-mentioned proposition that intermediate-freuqncy signal is processed, intermediate-freuqncy signal after will processing at last is converted to digital baseband signal, digital baseband signal after will changing is at last processed through digital-to-analogue conversion, be converted to radiofrequency signal and send to rf terminal, the purpose that covers on a large scale to reach signal of communication.And in the uplink processing process, the repeater receives the radiofrequency signal that at least one rf terminal is sent, with the radiofrequency signal process analog-to-digital conversion that receives, be converted to intermediate-freuqncy signal, then adopt the intermediate-freuqncy signal processing method of the embodiment of the invention one above-mentioned proposition that intermediate-freuqncy signal is processed, intermediate-freuqncy signal after will processing at last is converted to digital baseband signal, and the digital baseband signal after will changing is at last processed through digital-to-analogue conversion, is converted to radiofrequency signal and sends to the base station.
Step 1: the repeater receives the radiofrequency signal that send the base station, and the radiofrequency signal that receives is converted to intermediate-freuqncy signal.
Shown in Fig. 7 a, the embodiment of the invention three take one of them default working frequency range of repeater as example, further elaborates down link intermediate-freuqncy signal processing method here.Fig. 7 b is centering frequency signal processing method in the up link, and its processing procedure is identical with down link.In the frequency range of intermediate-freuqncy signal # 1, comprise a plurality of frequency sub-band, the corresponding intermediate-freuqncy signal of each frequency sub-band.Correspondingly, in the frequency range of intermediate-freuqncy signal # 2, comprise a plurality of frequency sub-band, the corresponding intermediate-freuqncy signal of each frequency sub-band.
Step 2: to dropping on the discretization of the intermediate-freuqncy signal # 1 process analog to digital converter ADC# 1 realization signal in the default working frequency range scope, the intermediate-freuqncy signal of all frequency sub-band that comprise in the intermediate-freuqncy signal # 1 frequency range after the discretization is as a whole together through the broadband down-converted, the center frequency point of intermediate-freuqncy signal # 1 is moved zero-frequency, realize simultaneously the orthogonalization process of intermediate-freuqncy signal.Intermediate-freuqncy signal # 1 after the orthogonalization process reduces the signal sampling rate of intermediate-freuqncy signal # 1 through digital filter Filter#01.Similarly, also carry out the identical processing procedure with intermediate-freuqncy signal # 1 for intermediate-freuqncy signal #2.Behind the signal process CPRI framing for digital filter Filter# 01 and Filter# 02 output, through closing frame Serdes physical layer, realize that the signal of telecommunication is to the conversion of light signal, and then realize light signal to the conversion (not shown among Fig. 7 a) of the signal of telecommunication, realize the recovery of each intermediate-freuqncy signal through CPRI solution frame by the Serdes physical layer.
Step 3: adopt the frequency sub-band dividing mode, determine each frequency sub-band in intermediate-freuqncy signal # 01 and the #02 frequency range.
Wherein, can be according to frequency sub-band width value and frequency sub-band center frequency point, the frequency sub-band in the intermediate-freuqncy signal # 01 that receives in the definite default working frequency range of employing frequency sub-band dividing mode and the described working frequency range at #02 place.
Particularly, the frequency sub-band width value can set in advance, also can be according to default frequency sub-band minimum widith value and Breadth Maximum value, and default step value is determined.
Preferably, in order to realize that various dissimilar intermediate-freuqncy signals are processed, the embodiment of the invention three proposes a kind of can under certain constraints, at random the intermediate-freuqncy signal of various different frequency ranges the processing here.By the elaboration among the embodiment one as can be known, for the intermediate-freuqncy signal of the different frequency sub-band of determining, as long as determined center frequency point and the bin width value of frequency sub-band, the characteristic of so corresponding frequency sub-band intermediate-freuqncy signal also can be determined.So the embodiment of the invention three adopts the formula 1 in above-described embodiment one to determine the frequency sub-band width value, and between between each frequency sub-band of determining, be separated with default transition frequency range here.
Step 4: respectively the intermediate-freuqncy signal in each frequency sub-band of determining is carried out frequency sub-band down-converted, the processing of digital molding filtration and frequency sub-band upconversion process.
Particularly, for determining at least one frequency sub-band, adopt direct digital frequency synthesis technology, generate sinusoidal signal and the cosine signal identical with this frequency sub-band frequency, then according to the sinusoidal signal and the cosine signal that generate the intermediate-freuqncy signal in this frequency sub-band is modulated, the intermediate-freuqncy signal center frequency point in this frequency sub-band is moved to the zero-frequency position.Carry out the intermediate-freuqncy signal # 01 after the frequency sub-band down-converted, carry out filtering by Filter# 01 and process, form independently frequency sub-band intermediate-freuqncy signal #01.At last a plurality of independently frequency sub-band intermediate-freuqncy signals that form are carried out the subband upconversion process, be specially: for a frequency sub-band, adopt direct digital frequency synthesis technology, generate sinusoidal signal and the cosine signal identical with the intermediate-freuqncy signal frequency of this frequency sub-band, then according to the sinusoidal signal and the cosine signal that generate the intermediate-freuqncy signal in this frequency sub-band is modulated, the intermediate-freuqncy signal center frequency point in each frequency sub-band is moved to carrying out down-converted position before.Similar with the processing procedure of intermediate-freuqncy signal # 01 to intermediate-freuqncy signal # 02 processing procedure, repeat no more here.
Wherein, adopt direct digital frequency synthesis technology, the intermediate-freuqncy signal of each frequency sub-band of determining is carried out the frequency sub-band down-converted, digital molding filtration is processed and during the frequency sub-band upconversion process, can in a digital processing link, carry out, also can in many digital processing links, carry out.And, adopt direct digital frequency synthesis technology to the intermediate-freuqncy signal of each frequency sub-band of determining carry out the frequency sub-band down-converted, digital molding filtration is processed and during the frequency sub-band upconversion process, the configuration of each parameter in the direct digital frequency synthesis technology is relevant with the frequency sub-band width value with the center frequency point of each frequency sub-band of determining.Particularly, take the center frequency point shown in Fig. 5 as f1, the bin width value is that the intermediate-freuqncy signal of B1 (is abbreviated as f1, B1) be example, set forth respectively under the preset parameter and the configurable situation of parameter under, adopt direct digital frequency synthesis technology that each frequency sub-band intermediate-freuqncy signal is carried out the frequency sub-band down-converted, digital molding filtration is processed and frequency sub-band upconversion process process.
First kind of way: under the preset parameter, adopt direct digital frequency synthesis technology that each frequency sub-band intermediate-freuqncy signal is carried out the frequency sub-band down-converted, the processing procedure of digital molding filtration processing and frequency sub-band upconversion process.
Adopt direct digital frequency synthesis technology, need to use Direct Digital Synthesizer (DDS, Direct Digital Synthesizer) and digital formed filter.Wherein, DDS generates the sine and cosine signal.Particularly, it is that example is described in detail that the embodiment of the invention three adopts two DDS, a digital formed filter here, as shown in Figure 8 DDS0 and DDS1.
To (f1, when intermediate-freuqncy signal B1) is carried out the frequency sub-band down-converted, DDS0 need to produce one and (f1, B1) sinusoidal signal of same frequency and cosine signal, the sinusoidal signal and the cosine signal that utilize to produce are modulated (f1, B1) intermediate-freuqncy signal, such as carrying out the operation such as multiply-add operation, the center frequency point f1 of (f1, B1) intermediate-freuqncy signal is moved to the zero-frequency place.Carry out the intermediate-freuqncy signal (f1, B1) after the down-converted, through digital formed filter the filtering of sideband spurious signal is processed.Wherein, the parameter of digital formed filter is only relevant with the width value of intermediate-freuqncy signal (f1, B1).Carry out the intermediate-freuqncy signal (f1 after digital filtering is processed, B1), need to carry out the frequency sub-band upconversion process, produce one and (f1 by DDS1, B1) sinusoidal signal of same frequency and cosine signal utilize the sinusoidal signal and the cosine signal that produce that intermediate-freuqncy signal (f1, B1) is modulated, the center frequency point f1 of intermediate-freuqncy signal (f1, B1) is moved to carrying out down-converted position before.
From the above, respectively the intermediate-freuqncy signal of frequency sub-band is being carried out in the process of frequency sub-band upconversion process and frequency sub-band down-converted, DDS0 and DDS1 need to produce a frequency and intermediate-freuqncy signal (f1, B1) identical sinusoidal signal and cosine signal, therefore, the parameter of DDS0 and DDS1 has consistency.In actual applications, only need to determine the center frequency point of intermediate-freuqncy signal (f1, B1), just can calculate control word corresponding to DDS0 and DDS1, further configure the parameter of DDS0 and DDS1 according to the control word of determining.
Particularly, the calculating of DDS0 and DDS1 parameter can but be not limited to be finished by devices such as host computer, microcontroller chip or other intelligent chips.
The second way: in the configurable situation of parameter, adopt direct digital frequency synthesis technology that each frequency sub-band intermediate-freuqncy signal is carried out frequency sub-band down-converted, the processing of digital molding filtration and frequency sub-band upconversion process process.
Based on framework shown in Figure 8, each frequency sub-band intermediate-freuqncy signal is carried out the frequency sub-band down-converted, when the processing of numeral molding filtration and frequency sub-band upconversion process, the parameter of DDS0 and DDS1 is relevant with the center frequency point of the intermediate-freuqncy signal of each frequency sub-band, the parameter of numeral formed filter is only relevant with the width value of the intermediate-freuqncy signal of each frequency sub-band, gets final product so only need to determine respectively the parameter of DDS0, DDS1 and digital formed filter.
For the communication system that adopts the repeater as relaying, in the situation that system resource and transmission bandwidth allow, the number of the digital processing link of system increases, the flexibility of system also can strengthen, but in actual applications, the digital processing link of each system assignment is just decided at the beginning of design, and the digital processing link number that for example distributes is the N bar.For digital processing link wherein, the width value of the handled intermediate-freuqncy signal of this digital processing link can be according to the width value of the frequency sub-band intermediate-freuqncy signal of determining, regular variation under certain constraints.For example, when the width value of frequency sub-band is when adopting formula 1 in above-described embodiment one to calculate, correspondingly, also can above-mentioned formula 1 determine the width value of the frequency sub-band intermediate-freuqncy signal that this digital processing link can be processed.
Particularly, for all digital processing links that distribute in the system, the technical scheme that all can adopt the embodiment of the invention to propose here makes the width value of the handled intermediate-freuqncy signal of each bar digital processing link can regular variation under certain constraints.
More specifically, for the N bar digital processing link that distributes, can choose the technical scheme of the wherein above-mentioned proposition of a part of digital processing link employing embodiment of the invention and come intermediate-freuqncy signal is processed, remaining digital processing link is set to process the intermediate-freuqncy signal of fixed center frequency fixed width value.
For example, for above-mentioned formula 1, suppose Bmin=10, Bmax=60, default step value Δ b=10, then according to formula 1, this digital processing link is respectively 10,20,30,40 and 50 to the width value of the frequency sub-band that should be able to process.Preferably, can also be between each width value the default frequency range in interval.For example, the predetermined interval frequency range can regularly change, and also can adopt a fixing frequency range value (such as Δ B among Fig. 5).Like this, the parameter that is arranged on the digital formed filter on this digital processing link just can change dynamically.Thereby make whole system have very strong flexibility.
Preferably, in actual applications, for digital shaping filter, can adopt the FIR filter construction, the parameter of filter can be an array.In the situation that guarantees identical frequency sub-band width value, this group parameter is one group of fixing sequence, the corresponding one group of fixing forming filter coefficient (as shown in Figure 9) of the width value of each frequency sub-band intermediate-freuqncy signal.Suppose that the frequency sub-band width value is not identical, then corresponding N kind digital filter configuration.At this moment, need the fixing parameter of N group, because each step value is preset, so needed N group sequence can be calculated, and it is stored in the internal storage of control logic, in the Parameter storage and external memory storage that also this can be calculated, the width value adjustment of the intermediate-freuqncy signal of the frequency sub-band of processing as required gets final product.Can change online like this characteristic of digital shaping filter, can process the intermediate-freuqncy signal of dissimilar frequency sub-band, make system have very strong flexibility.
Parameter for DDS0 and DDS1, can at random change by the mode that changes control word the output frequency of output signal (embodiment of the invention three is exported the sinusoidal signal cosine signal here), and the output frequency of output signal is relevant with reference clock fclk: output frequency f=(control word)/2
N* fclk.As long as so determine the control word of intermediate-freuqncy signal, the sinusoidal signal that DDS0 and DDS1 need to generate and the frequency of cosine signal also can be determined, and have linear relationship between control word and the output frequency, therefore can calculate by target output frequency f the control word of frequency sub-band intermediate-freuqncy signal.
Adopt direct digital frequency synthesis technology, by the configuration to the DDS control word, can guarantee that digital processing link can process the intermediate-freuqncy signal of different center frequency point, thereby increase the flexibility of system.Particularly, the calculating of control word can but be not limited to by host computer or central processing unit (CPU, Central Processing Unit) calculates, also can be directly at control logic device such as field programmable gate array (FPGA, Field-Programmable Gate Array), the device inside Resource Calculation such as Digital Signal Processing (DSP, Digital Signal Proccessing) or table look-up and obtain the control word of this intermediate-freuqncy signal.
Step 5: each intermediate-freuqncy signal after the step 4 processing is closed the road process, for example carry out adduction and process, the intermediate-freuqncy signal after then process on involutory road improves the filtering of signal sampling rate and processes.
For example, shown in Fig. 7 a, the intermediate-freuqncy signal # 1 that carries out after adduction is processed processes by the filtering that filter Filter# 21 improves signal sampling rate, obtains default intermediate-freuqncy signal corresponding to working frequency range.
Step 6: the intermediate-freuqncy signal # 1 after the filtering processing in the step 5 is carried out the broadband upconversion process through analog to digital converter, then transmission.
Particularly, see also the elaborating of intermediate-freuqncy signal # 1 processing procedure for the concrete processing procedure of intermediate-freuqncy signal # 2, repeat no more here.
Need to prove, the technical scheme that the embodiment of the invention three proposes here, can but be not limited to the handling process shown in Fig. 7 a and Fig. 7 b, also can consider according to internal system resource etc., processing procedure is adjusted, for example the processing procedure to down link shown in Figure 10 changes the flow chart after adjusting, and its processing procedure sees also elaborating of the various embodiments described above, repeats no more here.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (17)
1. an intermediate-freuqncy signal processing method is characterized in that, comprising:
Adopt the frequency sub-band dividing mode, determine to preset the interior frequency sub-band of described working frequency range at each intermediate-freuqncy signal place of receiving in the working frequency range;
Respectively the intermediate-freuqncy signal in each frequency sub-band of determining is carried out frequency sub-band down-converted, the processing of digital molding filtration and frequency sub-band upconversion process;
Each intermediate-freuqncy signal after processing is closed the road process, obtain default intermediate-freuqncy signal corresponding to working frequency range.
2. the method for claim 1 is characterized in that, determines also to comprise before the frequency sub-band in the described working frequency range at each intermediate-freuqncy signal place:
All intermediate-freuqncy signals in the default working frequency range are carried out broadband down-converted, the filtering processing that reduces signal sampling rate, public radio interface CPRI framing and CPRI together separate the frame processing.
3. the method for claim 1 is characterized in that, each intermediate-freuqncy signal after processing is closed the road process, and also comprises:
Intermediate-freuqncy signal after process on involutory road improves the filtering of signal sampling rate and processes.
4. the method for claim 1 is characterized in that, determines the interior frequency sub-band of described working frequency range at each intermediate-freuqncy signal place, comprising:
According to frequency sub-band width value and frequency sub-band center frequency point, adopt the frequency sub-band dividing mode to determine to preset the interior frequency sub-band of described working frequency range at each intermediate-freuqncy signal place of receiving in the working frequency range.
5. method as claimed in claim 4 is characterized in that, described frequency sub-band width value sets in advance; Or
Described frequency sub-band width value is according to default frequency sub-band minimum widith value and Breadth Maximum value, and default step value is determined.
6. method as claimed in claim 5 is characterized in that, adopts following formula to determine the frequency sub-band width value:
B＝B
min+n×Δb，n＝0，1，......N-1；N＝(B
max-B
min)/Δb
Wherein, B is the width value of the frequency sub-band determined, B
MinThe minimum widith value of frequency sub-band to be divided, B
MaxBe the Breadth Maximum value of frequency sub-band to be divided, Δ b is the step value of presetting.
7. method as claimed in claim 4 is characterized in that, is separated with default transition frequency range between between described each definite frequency sub-band.
8. the method for claim 1 is characterized in that, the intermediate-freuqncy signal in the frequency sub-band is carried out the frequency sub-band down-converted, comprising:
For a frequency sub-band, adopt direct digital frequency synthesis technology, generate sinusoidal signal and the cosine signal identical with this frequency sub-band frequency;
According to the sinusoidal signal and the cosine signal that generate the intermediate-freuqncy signal in this frequency sub-band is modulated, the intermediate-freuqncy signal center frequency point in this frequency sub-band is moved to the zero-frequency position.
9. the method for claim 1 is characterized in that, the intermediate-freuqncy signal in the frequency sub-band is carried out the frequency sub-band upconversion process, comprising:
For a frequency sub-band, adopt direct digital frequency synthesis technology, generate sinusoidal signal and the cosine signal identical with the intermediate-freuqncy signal frequency of this frequency sub-band;
According to the sinusoidal signal and the cosine signal that generate the intermediate-freuqncy signal in this frequency sub-band is modulated, the intermediate-freuqncy signal center frequency point in each frequency sub-band is moved to carrying out down-converted position before.
10. a signal process unit of intermediate frequency is characterized in that, comprising:
Determining unit is used for adopting the frequency sub-band dividing mode, determines to preset the interior frequency sub-band of described working frequency range at each intermediate-freuqncy signal place of receiving in the working frequency range;
The frequency sub-band processing unit is used for respectively the intermediate-freuqncy signal in each definite frequency sub-band of determining unit being carried out frequency sub-band down-converted, the processing of digital molding filtration and frequency sub-band upconversion process;
Close the road processing unit, be used for that each intermediate-freuqncy signal after the frequency sub-band processing unit processes is closed the road and process, obtain default intermediate-freuqncy signal corresponding to working frequency range.
11. device as claimed in claim 10 is characterized in that, also comprises:
The Wideband Signal Processing unit is used for that all intermediate-freuqncy signals in the default working frequency range are carried out broadband down-converted, the filtering processing that reduces signal sampling rate, public radio interface CPRI framing and CPRI together and separates the frame processing.
12. device as claimed in claim 11 is characterized in that, the described road processing unit that closes also is used for the filtering processing that the intermediate-freuqncy signal after process on involutory road improves signal sampling rate.
13. device as claimed in claim 11, it is characterized in that, described determining unit, concrete being used for according to frequency sub-band width value and frequency sub-band center frequency point, the frequency sub-band in the described working frequency range at each intermediate-freuqncy signal place of receiving in the definite default working frequency range of employing frequency sub-band dividing mode.
14. device as claimed in claim 13 is characterized in that, described determining unit is concrete for basis default frequency sub-band minimum widith value and Breadth Maximum value, and default step value, determines the width value of frequency sub-band.
15. device as claimed in claim 14 is characterized in that, described frequency sub-band width value sets in advance; Perhaps described determining unit is concrete adopts following formula to determine the frequency sub-band width value:
B＝B
min+n×Δb，n＝0，1，......N-1；N＝(B
max-B
min)/Δb
Wherein, B is the width value of the frequency sub-band determined, B
MinThe minimum widith value of frequency sub-band to be divided, B
MaxBe the Breadth Maximum value of frequency sub-band to be divided, Δ b is the step value of presetting.
16. device as claimed in claim 10 is characterized in that, described frequency sub-band processing unit, and concrete being used for for a frequency sub-band, adopt direct digital frequency synthesis technology, generate sinusoidal signal and the cosine signal identical with this frequency sub-band frequency; And according to the sinusoidal signal and the cosine signal that generate the intermediate-freuqncy signal in this frequency sub-band is modulated, the intermediate-freuqncy signal center frequency point in this frequency sub-band is moved to the zero-frequency position.
17. device as claimed in claim 10 is characterized in that, described frequency sub-band processing unit, and concrete being used for for a frequency sub-band, adopt direct digital frequency synthesis technology, generate sinusoidal signal and the cosine signal identical with the intermediate-freuqncy signal frequency of this frequency sub-band; And according to the sinusoidal signal and the cosine signal that generate the intermediate-freuqncy signal in this frequency sub-band is modulated, the intermediate-freuqncy signal center frequency point in each frequency sub-band is moved to the position of carrying out before the down-converted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210088998.6A CN103368888B (en) | 2012-03-29 | 2012-03-29 | A kind of IF signal processing method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210088998.6A CN103368888B (en) | 2012-03-29 | 2012-03-29 | A kind of IF signal processing method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103368888A true CN103368888A (en) | 2013-10-23 |
| CN103368888B CN103368888B (en) | 2016-04-06 |
Family
ID=49369446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210088998.6A Expired - Fee Related CN103368888B (en) | 2012-03-29 | 2012-03-29 | A kind of IF signal processing method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103368888B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015161478A1 (en) * | 2014-04-24 | 2015-10-29 | 华为技术有限公司 | Signal processing device, method and system |
| CN105278404A (en) * | 2015-09-18 | 2016-01-27 | 广州北航新兴产业技术研究院 | Base-band device based on software radio |
| WO2016187887A1 (en) * | 2015-05-28 | 2016-12-01 | 华为技术有限公司 | Signal transmission method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201585145U (en) * | 2010-01-05 | 2010-09-15 | 上海瀚儒通信技术有限公司 | TD-SCDMA/GSM dual-mode multi-carrier digital repeater |
| CN101834824A (en) * | 2010-03-22 | 2010-09-15 | 深圳市云海通讯股份有限公司 | Multicarrier filtration method, multicarrier filtration system and repeater |
| CN102148679A (en) * | 2010-02-05 | 2011-08-10 | 西瑞克斯(北京)通信设备有限公司 | Low-complexity bandwidth signal digital frequency selection method |
-
2012
- 2012-03-29 CN CN201210088998.6A patent/CN103368888B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201585145U (en) * | 2010-01-05 | 2010-09-15 | 上海瀚儒通信技术有限公司 | TD-SCDMA/GSM dual-mode multi-carrier digital repeater |
| CN102148679A (en) * | 2010-02-05 | 2011-08-10 | 西瑞克斯(北京)通信设备有限公司 | Low-complexity bandwidth signal digital frequency selection method |
| CN101834824A (en) * | 2010-03-22 | 2010-09-15 | 深圳市云海通讯股份有限公司 | Multicarrier filtration method, multicarrier filtration system and repeater |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015161478A1 (en) * | 2014-04-24 | 2015-10-29 | 华为技术有限公司 | Signal processing device, method and system |
| CN105874719A (en) * | 2014-04-24 | 2016-08-17 | 华为技术有限公司 | Signal processing device, method and system |
| US9917606B2 (en) | 2014-04-24 | 2018-03-13 | Huawei Technologies Co., Ltd. | Signal processing apparatus, method, and system |
| US10090873B2 (en) | 2014-04-24 | 2018-10-02 | Huawei Technologies Co., Ltd. | Signal processing apparatus, method, and system |
| WO2016187887A1 (en) * | 2015-05-28 | 2016-12-01 | 华为技术有限公司 | Signal transmission method and device |
| CN107534630A (en) * | 2015-05-28 | 2018-01-02 | 华为技术有限公司 | Method for transmitting signals and device |
| CN107534630B (en) * | 2015-05-28 | 2020-08-21 | 中科深信(深圳)科技有限公司 | Signal transmission method and device |
| CN105278404A (en) * | 2015-09-18 | 2016-01-27 | 广州北航新兴产业技术研究院 | Base-band device based on software radio |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103368888B (en) | 2016-04-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104602244B (en) | LTE operation in white spaces | |
| CN101197606B (en) | Digital intermediate frequency conversion method and system used in repeater | |
| CN104184451B (en) | Reconfigurable circuit block and exemplary method for configuring the circuit block | |
| CN111211759B (en) | Filter coefficient determination method and device and digital DAS system | |
| CN101521893B (en) | Wideband digital frequency selecting and radiating pulling system and signal processing method thereof | |
| CN102299878B (en) | Method and device for realizing multi-band digital predistortion (DPD) | |
| CN106211195A (en) | A kind of indoor distributed covering system of LTE and method | |
| WO2016023207A1 (en) | Signal processing method and related device and apparatus | |
| CN101945431B (en) | Lossy data compression method and lossy data compression-based digital communication system | |
| CN103368888B (en) | A kind of IF signal processing method and device | |
| CN102104391B (en) | Intermediate-frequency filtering device and method | |
| US9083440B2 (en) | Method and device for sending/receiving electromagnetic signals received/sent on one or more first frequency bands | |
| CN106912056B (en) | 230MHz micro base station and networking method thereof | |
| CN104768190B (en) | A kind of signal process unit of intermediate frequency and method based on LTE230 | |
| CN103684654A (en) | Cellular mobile communication radio-frequency signal interference device in passenger aircraft passenger cabin | |
| WO2007119131A3 (en) | Carrier frequency shifting in mobile communications | |
| CN102333389A (en) | Three-mode digital optical fiber remote system | |
| CN102891695B (en) | Asymmetric flexible communication transceiver and communication system | |
| CN106535199B (en) | Dual-channel communication method based on 433MHz and 2.4GHz frequency bands | |
| CN105007245A (en) | Method for changing emission spectrum shape of transmission system | |
| CN203086407U (en) | Multi-time frequency conversion EHF frequency range up-converter | |
| CN201403208Y (en) | Frequency-selecting type device of CDMA in digital optical fiber remote system | |
| CN112787968B (en) | Low-delay multi-node real-time wireless network transmission method based on radio frequency forwarding | |
| CN103916877A (en) | Signal processing method and radio remote unit (RRU) | |
| EP2278721B1 (en) | Apparatus, system, and method for sharing antenna and feeder |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 510663 No. 10 Shenzhou Road, Guangzhou Science City, Guangdong Province Patentee after: Jingxin Network System Co.,Ltd. Address before: 510663 No. 10 Shenzhou Road, Guangzhou Science City, Guangdong Province Patentee before: COMBA TELECOM SYSTEMS (CHINA) Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160406 |