CN103368888B - A kind of IF signal processing method and device - Google Patents
A kind of IF signal processing method and device Download PDFInfo
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Abstract
The invention discloses a kind of IF signal processing method and device, comprising: adopt frequency sub-band dividing mode, determine the frequency sub-band in the described working frequency range at each intermediate-freuqncy signal place received in default working frequency range; Respectively frequency sub-band down-converted, digital fabrication filtering process and frequency sub-band upconversion process are carried out to the intermediate-freuqncy signal in each frequency sub-band determined; Each intermediate-freuqncy signal after process is carried out the process of conjunction road, obtain and preset intermediate-freuqncy signal corresponding to working frequency range.The technical scheme adopting the present invention to propose, can improve the compatibility of system preferably, reduce the expense of system resource.
Description
Technical field
The present invention relates to digital signal processing technique field, especially relate to a kind of IF signal processing method and device.
Background technology
In mobile communication system, the weak signal area covered for cordless communication network, blind area, outlying district, adopt repeater to be a kind of low cost, efficiently solution as relaying.
Repeater is presetting in working frequency range by operator, receive the radiofrequency signal dropped in default working frequency range that base station is sent, and by the radiofrequency signal that receives through frequency-conversion processing, obtain the intermediate-freuqncy signal in corresponding band, then adopt software and radio technique the intermediate-freuqncy signal after digitized processing to be carried out converting and 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 made up 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
0the left side band frequency values of=B/2, 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 prior art, adopt repeater as the communication system of relaying, when intermediate-freuqncy signal is transmitted, need to carry out removing process frequently, removing in frequency processing procedure, need for the intermediate-freuqncy signal that frequency range is identical, center frequency point is identical distributes a digital processing link, then in the digital processing link distributed, frequently process is removed to the intermediate-freuqncy signal of this frequency range, is specially (with reference to Fig. 1): by the center frequency point f of intermediate-freuqncy signal 101
0move to zero-frequency and the intermediate-freuqncy signal 102 after moving is performed orthogonalization process, the intermediate-freuqncy signal after orthogonalization process carries out upconversion process and filtering process respectively, transmits after being converted to digital baseband signal.But along with the evolution of technology, communication products are transitioned into multimode product by single mode product gradually, namely adopting repeater as in the communication system of relaying, the incomplete same intermediate-freuqncy signal of transmission band have multiple center frequency point in each default working frequency range, taking, 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 the multiple intermediate-freuqncy signals in default working frequency range are diversified.Due in employing repeater as in the communication system of relaying, pre-assigned digital processing link can only processing center frequency and the transmission band intermediate-freuqncy signal of all fixing, and can not process the intermediate-freuqncy signal that other center frequency point is different or frequency range is different.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, to the method that intermediate-freuqncy signal processes in prior art, compatible poor, and resource overhead is also larger.
Summary of the invention
Embodiments provide a kind of IF signal processing method and device, the compatibility of system can be improved preferably, reduce the expense of system resource.
The technical scheme that the embodiment of the present invention provides is as follows:
A kind of IF signal processing method, comprising: adopt frequency sub-band dividing mode, determine the frequency sub-band in the described working frequency range at each intermediate-freuqncy signal place received in default working frequency range; Respectively frequency sub-band down-converted, digital fabrication filtering process and frequency sub-band upconversion process are carried out to the intermediate-freuqncy signal in each frequency sub-band determined; Each intermediate-freuqncy signal after process is carried out the process of conjunction road, obtain and preset intermediate-freuqncy signal corresponding to working frequency range.
A kind of signal process unit of intermediate frequency, comprising: determining unit, for adopting frequency sub-band dividing mode, determining the frequency sub-band in the described working frequency range at each intermediate-freuqncy signal place received in default working frequency range; Frequency sub-band processing unit, carries out frequency sub-band down-converted, digital fabrication filtering process and frequency sub-band upconversion process for the intermediate-freuqncy signal in each frequency sub-band of determining determining unit respectively; Close road processing unit, for each intermediate-freuqncy signal after frequency sub-band processing unit processes being carried out the process of conjunction road, obtaining and presetting intermediate-freuqncy signal corresponding to working frequency range.
Adopt technique scheme, the whole intermediate-freuqncy signals received in default working frequency range are divided into the intermediate-freuqncy signal of multiple frequency sub-band, then a digital processing link is adopted, respectively respective handling is carried out to the intermediate-freuqncy signal in each frequency sub-band after division, finally each frequency sub-band intermediate-freuqncy signal after process is carried out the process of conjunction road, like this, can be implemented in a digital processing link, the intermediate-freuqncy signal of multiple centre frequency and bandwidth can be processed respectively, and then improve the compatibility of system, the expense of reduction system resource preferably.
Accompanying drawing explanation
Fig. 1 is in prior art, and a digital processing processing of circuit of proposition presets the intermediate-freuqncy signal schematic diagram in working frequency range;
Fig. 2 is in the embodiment of the present invention one, a kind of IF signal processing method flow diagram of proposition;
Fig. 3 is in the embodiment of the present invention one, the intermediate-freuqncy signal composition schematic diagram dropped in default working frequency range of proposition;
Fig. 4 is in the embodiment of the present invention one, proposition after carrying out broadband down-converted, center frequency point f0 is moved the schematic diagram to zero-frequency;
Fig. 5 is in the embodiment of the present invention one, and the frequency sub-band of proposition divides processing procedure schematic diagram;
Fig. 6 is in the embodiment of the present invention two, a kind of signal process unit of intermediate frequency structure chart of proposition;
Fig. 7 a is in the embodiment of the present invention three, and the processing procedure schematic diagram of the intermediate-freuqncy signal downstream communications link in working frequency range is preset in the repeater of proposition;
Fig. 7 b is in the embodiment of the present invention three, and the processing procedure schematic diagram of the intermediate-freuqncy signal uplink communication links in working frequency range is preset in the repeater of proposition;
Fig. 8 is in the embodiment of the present invention three, proposition to determining the schematic diagram that frequency sub-band intermediate-freuqncy signal processes;
Fig. 9 is in the embodiment of the present invention three, the calculation of parameter of proposition and storage schematic diagram;
Figure 10 is in the embodiment of the present invention three, the schematic diagram after the IF signal processing flow process of proposition changes.
Embodiment
For exist in prior art intermediate-freuqncy signal is processed time, the problem that the compatibility of system is poor and system resource overhead is larger, the technical scheme that the embodiment of the present invention proposes here, by the mode that frequency sub-band divides, determine the frequency sub-band in the working frequency range at each intermediate-freuqncy signal place received in default working frequency range, then respectively frequency sub-band down-converted is carried out to the intermediate-freuqncy signal in each frequency sub-band determined, digital fabrication filtering process and frequency sub-band upconversion process, the intermediate-freuqncy signal in each frequency sub-band is made to become independently intermediate-freuqncy signal, finally each intermediate-freuqncy signal after process is carried out the process of conjunction road, obtain and preset intermediate-freuqncy signal corresponding to working frequency range.Like this, can in a digital processing link, process the intermediate-freuqncy signal of dissimilar bandwidth respectively, and can configure flexibly according to the center frequency point of each frequency sub-band intermediate-freuqncy signal and bin width value, the compatibility of system can be improved preferably, reduce the expense of system resource.
It should be noted that, the method that intermediate-freuqncy signal is processed that various embodiments of the present invention propose here and device, be that example is described in detail based on a digital processing link, in the design and application of reality, the general principle that can propose here based on various embodiments of the present invention, design more digital processing link, different digital processing links is enable to process the intermediate-freuqncy signal of each frequency range flexibly, thus make all intermediate-freuqncy signals dropped in default working frequency range all can obtain respective handling, and then make whole communication system be applicable in the different scene of various working frequency range, thus make system have very strong compatibility, and, in multimode product, when multimode communication signal coexistence, adopt the technical scheme that various embodiments of the present invention propose here, the transmission pressure of signal can be alleviated preferably.
Below in conjunction with each accompanying drawing, the main of embodiment of the present invention technical scheme is realized principle, embodiment and set forth in detail the beneficial effect that should be able to reach.
Embodiment one:
The embodiment of the present invention one proposes a kind of IF signal processing method here.It should be noted that, the IF signal processing method that the embodiment of the present invention one proposes here, can process the intermediate-freuqncy signal of down link in communication system, also can process the intermediate-freuqncy signal of up link in communication system, its concrete processing procedure is identical, as shown in Figure 2, its concrete processing procedure is as follows:
Step 21, each multimode product, when normally working, all can have the working frequency range preset.Such as adopting repeater as in the communication system of relaying, operator according to requirement of engineering, can preset the working frequency range of each repeater.Under repeater is in normal operating conditions, the radiofrequency signal dropped in default working frequency range of the multiple identical or different systems that base station is sent can be received, the radiofrequency signal of at least one standard received is passed through and is reduced frequency processing by repeater, form the intermediate-freuqncy signal dropped in default working frequency range, as shown in Figure 3.
Step 22, carries out broadband down-converted together to all intermediate-freuqncy signals dropped in default working frequency range, is illustrated in figure 4 after carrying out broadband down-converted and center frequency point f0 is moved the schematic diagram to zero-frequency.Carry out the filtering process of all intermediate-freuqncy signals process reduction signal sampling rates after the down-converted of broadband, common wireless interface (CPRI, CommonPublicRadioInterface) framing and CPRI and separate frame process.
As shown in Figure 4, intermediate-freuqncy signal after the down-converted of broadband, center frequency point and the whole passband of whole intermediate-freuqncy signal have all been moved to the left f0, namely all intermediate-freuqncy signals are integrally after carrying out broadband down-converted, and center frequency point is moved to zero-frequency (place at zero point of transverse axis ω).And after the filtering process carrying out reducing signal sampling rate to all intermediate-freuqncy signals after carrying out broadband down-converted, can in the sample rate of the situation decline low signal of the center frequency point and bin width that do not change each intermediate-freuqncy signal, namely the follow-up signal needing transmission is decreased, and do not affect the recovery of intermediate-freuqncy signal in subsequent processes, thus alleviate the transmission pressure of intermediate-freuqncy signal when carrying out CPRI transmission.
Step 23, to all intermediate-freuqncy signals after step 22 processes, adopts frequency sub-band dividing mode, determines the frequency sub-band in the described working frequency range at each intermediate-freuqncy signal place received in default working frequency range.
As shown in Figure 5, the embodiment of the present invention one, here for 4 intermediate-freuqncy signals, elaborates frequency sub-band and divides processing procedure.For each intermediate-freuqncy signal dropped in default working frequency range, there are the bin width corresponding with it and center frequency point information.So when determining each frequency sub-band intermediate-freuqncy signal, according to frequency sub-band width value corresponding to each intermediate-freuqncy signal and frequency sub-band center frequency point, the frequency sub-band in the described working frequency range at each intermediate-freuqncy signal place received in default working frequency range can be determined respectively.
Particularly, can be, but not limited to adopt following two kinds of methods to determine the frequency sub-band width value of each intermediate-freuqncy signal received in default working frequency range:
First method: the frequency sub-band width corresponding due to each intermediate-freuqncy signal is changeless, so can take the mode preset, presets the width value of each frequency sub-band.
Second method: according to the frequency sub-band minimum width value preset and Breadth Maximum value, and the step value preset determines the width value of each frequency sub-band.Particularly, following formula 1 can be adopted to determine 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 width value of frequency sub-band to be divided, B
maxbe the Breadth Maximum value of frequency sub-band to be divided, Δ b is default step value.
Particularly, be less than or equal within the scope of default working frequency range width value meeting the frequency sub-band width value determined, the step value Δ b preset can be, but not limited to be a fixing numerical value, also can be the numerical value according to preset rules change.Such as, the concrete value of Δ b can be, but not limited to be that rule according to certain increases progressively gradually, or successively decreases gradually according to certain rule, or according to certain multiple relationship change.
Adopt the above-mentioned second way to determine frequency sub-band width value, for the system that digital processing link is less, use a digital processing link, ensure that the intermediate-freuqncy signal width value of each frequency sub-band is that the step value preset increases or reduces, just can process the intermediate-freuqncy signal of number of different types.
Preferably, for ensureing that each frequency sub-band determined can carry out smoothly in follow-up processing procedure, the embodiment of the present invention one, is separated with default transition frequency range between each frequency sub-band determined here, Δ B as shown in Figures 4 and 5.
Step 24, the intermediate-freuqncy signal in each frequency sub-band determined step 23 respectively carries out frequency sub-band down-converted, digital fabrication filtering process and frequency sub-band upconversion process.
Wherein, when carrying out down-converted to the intermediate-freuqncy signal of each frequency sub-band determined, for each frequency sub-band, adopt direct digital frequency synthesis technology, generate the sinusoidal signal identical with the IF signal frequency in this frequency sub-band and cosine signal, then according to the sinusoidal signal generated and cosine signal, the intermediate-freuqncy signal in corresponding frequency sub-band is modulated, the intermediate-freuqncy signal center frequency point in corresponding frequency sub-band is moved to zero-frequency position.Such as, center frequency point as shown in Figure 5 is f1, frequency sub-band width value is that the intermediate-freuqncy signal of B1 is when carrying out down-converted, first direct digital frequency synthesis technology is adopted, (center frequency point that frequency is identical is f1 to the intermediate-freuqncy signal of generated frequency and this frequency sub-band, frequency sub-band width value is B1) sinusoidal signal and cosine signal, then according to the sinusoidal signal generated and cosine signal, the intermediate-freuqncy signal that center frequency point is f1 is modulated, the center frequency point f1 of this intermediate-freuqncy signal is moved to zero-frequency position.For center frequency point be f2, frequency sub-band width value is B2, center frequency point is f3, frequency sub-band width value is B3, center frequency point is f4, frequency sub-band width value is the intermediate-freuqncy signal of B4, also performs the respective handling process that similar center frequency point is f1, frequency sub-band width value is the intermediate-freuqncy signal of B1
For the intermediate-freuqncy signal of carrying out in each frequency sub-band after down-converted, combine digital molding filtration process respectively, by 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 the intermediate-freuqncy signal of each independently frequency sub-band formed, carry out frequency sub-band upconversion process.Be specially: for the intermediate-freuqncy signal in a frequency sub-band, adopt direct digital frequency synthesis technology, generate the sinusoidal signal identical with the IF signal frequency of this frequency sub-band and cosine signal, then according to the sinusoidal signal generated and cosine signal, 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 the position to carrying out before down-converted.Such as, as shown in Figure 5, for center frequency point be f1, bin width value be the intermediate-freuqncy signal of B1 carry out frequency sub-band upconversion process time, adopt direct digital frequency synthesis technology, generate the sinusoidal signal identical with this IF signal frequency and cosine signal, then according to the sinusoidal signal generated and cosine signal to center frequency point be f1, bin width value is that the intermediate-freuqncy signal of B1 is modulated, be f1 by center frequency point, bin width value be the position that the center frequency point of the intermediate-freuqncy signal of B1 moves to carrying out before down-converted.Similarly, be f2, B2 respectively 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, and the upconversion process process of the intermediate-freuqncy signal of bin width value B1 is similar, repeats no more here.
Particularly, in the process of the intermediate-freuqncy signal of each frequency sub-band determined being carried out to frequency sub-band down-converted, digital fabrication filtering process and frequency sub-band upconversion process, the intermediate-freuqncy signal of the frequency sub-band respectively determined can be processed respectively in a digital processing link, also existing multichannel technology in multimode product can be made full use of, the intermediate-freuqncy signal of each frequency sub-band adopting many digital processing links simultaneously to process to determine.
Step 25, carries out the process of conjunction road by each intermediate-freuqncy signal after process, obtain and preset intermediate-freuqncy signal corresponding to working frequency range.
Preferably, be improve the performance of intermediate-freuqncy signal, the intermediate-freuqncy signal after the process of involutory road can also carry out the filtering process of raising signal sampling rate.
The technical scheme of the above-mentioned proposition of the embodiment of the present invention one, can in a digital processing link, process the intermediate-freuqncy signal of dissimilar bandwidth simultaneously, and can configure flexibly each frequency sub-band, the compatibility of system can be improved preferably, reduce the expense of system resource.
Embodiment two:
The embodiment of the present invention two proposes a kind of signal process unit of intermediate frequency here, as shown in Figure 6, comprising:
Determining unit 601, for adopting frequency sub-band dividing mode, determines the frequency sub-band in the described working frequency range at each intermediate-freuqncy signal place received in default working frequency range.
Particularly, above-mentioned determining unit 601, specifically for according to frequency sub-band width value and frequency sub-band center frequency point, adopts the frequency sub-band that frequency sub-band dividing mode is determined in the described working frequency range at each intermediate-freuqncy signal place received in default working frequency range.
Particularly, above-mentioned determining unit 601, the frequency sub-band minimum width value preset specifically for basis and Breadth Maximum value, and the step value preset, determine the width value of frequency sub-band.
Particularly, described determining unit can adopt following formula determination 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 width value of frequency sub-band to be divided, B
maxbe the minimum width value of frequency sub-band to be divided, Δ b is default step value;
Frequency sub-band processing unit 602, carries out frequency sub-band down-converted, digital fabrication filtering process and frequency sub-band upconversion process for the intermediate-freuqncy signal in each frequency sub-band of determining determining unit 601 respectively.
Particularly, above-mentioned frequency sub-band processing unit 602, specifically for for a frequency sub-band, adopts direct digital frequency synthesis technology, generates the sinusoidal signal identical with this frequency sub-band frequency and cosine signal; And according to the sinusoidal signal generated and cosine signal, 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 zero-frequency position.
Particularly, above-mentioned frequency sub-band processing unit 602, specifically for for a frequency sub-band, adopts direct digital frequency synthesis technology, generates the sinusoidal signal identical with the IF signal frequency of this frequency sub-band and cosine signal; And according to the sinusoidal signal generated and cosine signal, 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 the position to carrying out before down-converted.
Close road processing unit 603, carry out the process of conjunction road for each intermediate-freuqncy signal after being processed by frequency sub-band processing unit 602, obtain and preset intermediate-freuqncy signal corresponding to working frequency range.
Particularly, above-mentioned conjunction road processing unit 603, also carries out for the intermediate-freuqncy signal after the process of involutory road the filtering process improving signal sampling rate.
Wherein, above-mentioned signal process unit of intermediate frequency, also comprise the Wideband Signal Processing unit 604, separate frame process for carrying out broadband down-converted, the filtering process reducing signal sampling rate, public radio interface CPRI framing and CPRI together to all intermediate-freuqncy signals in default working frequency range.
The technical scheme of the above-mentioned proposition of the embodiment of the present invention two, also can be implemented in a digital processing link, process the intermediate-freuqncy signal of dissimilar bandwidth simultaneously, and can configure flexibly each frequency sub-band, the compatibility of system can be improved preferably, reduce the expense of system resource.
Embodiment three:
Further, on the basis of above-described embodiment one and embodiment two, the embodiment of the present invention three, here for repeater, further describes IF signal processing method.
Wherein, in employing repeater as in the communication system of relaying, when normally working, there is default working frequency range each repeater.The working frequency range preset can be one, also can be multiple.Further, each working frequency range distributes fixing digital processing link accordingly and carrys out signal in this default working frequency range of alignment processing.Repeater, in the working frequency range preset, can process the signal of down link, as shown in Figure 7a, also can process as shown in Figure 7b the signal of up link.Wherein, in the processing procedure of down link, the identical standard at least one road that reception base station, repeater is sent or the radiofrequency signal of different systems, pass through analog-to-digital conversion, the radiofrequency signal received is treated to intermediate-freuqncy signal, then the IF signal processing method of the above-mentioned proposition of the embodiment of the present invention one is adopted to process intermediate-freuqncy signal, finally the intermediate-freuqncy signal after process is converted to digital baseband signal, finally by conversion after digital baseband signal through digital-to-analogue conversion process, be converted to radiofrequency signal and send to rf terminal, to reach the object that signal of communication covers on a large scale.And in uplink processing process, repeater receives the radiofrequency signal that at least one rf terminal is sent, by the radiofrequency signal that receives through analog-to-digital conversion, be converted to intermediate-freuqncy signal, then the IF signal processing method of the above-mentioned proposition of the embodiment of the present invention one is adopted to process intermediate-freuqncy signal, finally by process after intermediate-freuqncy signal be converted to digital baseband signal, finally by conversion after digital baseband signal through digital-to-analogue conversion process, be converted to radiofrequency signal and send to base station.
Step one: the radiofrequency signal that reception base station, repeater is sent, is converted to intermediate-freuqncy signal by the radiofrequency signal received.
As shown in Figure 7a, the embodiment of the present invention three for one of them default working frequency range of repeater, elaborates down link IF signal processing method here further.Fig. 7 b is centering frequency signal processing method in up link, and its processing procedure is identical with down link.In the frequency range of intermediate-freuqncy signal #1, comprise multiple frequency sub-band, the corresponding intermediate-freuqncy signal of each frequency sub-band.Correspondingly, in the frequency range of intermediate-freuqncy signal #2, comprise multiple frequency sub-band, the corresponding intermediate-freuqncy signal of each frequency sub-band.
Step 2: the discretization intermediate-freuqncy signal #1 dropped within the scope of default working frequency range being realized to signal through analog to digital converter ADC#1, the intermediate-freuqncy signal of all frequency sub-band comprised in the intermediate-freuqncy signal #1 frequency range after discretization is as a whole together through broadband down-converted, the center frequency point of intermediate-freuqncy signal #1 is moved zero-frequency, realizes the orthogonalization process of intermediate-freuqncy signal simultaneously.Intermediate-freuqncy signal #1 after orthogonalization process, through digital filter Filter#01, reduces the signal sampling rate of intermediate-freuqncy signal #1.Similarly, the identical processing procedure of same intermediate-freuqncy signal #1 is also performed for intermediate-freuqncy signal #2.For digital filter Filter#01 and Filter#02 export signal after CPRI framing, through closing frame Serdes physical layer, realize the conversion of the signal of telecommunication to light signal, and then realize the conversion (in Fig. 7 a not shown) of light signal to the signal of telecommunication, separate through CPRI the recovery that frame realizes each intermediate-freuqncy signal by Serdes physical layer.
Step 3: adopt frequency sub-band dividing mode, determine each frequency sub-band in intermediate-freuqncy signal #01 and #02 frequency range.
Wherein, can according to frequency sub-band width value and frequency sub-band center frequency point, employing frequency sub-band dividing mode determines the frequency sub-band in the described working frequency range at intermediate-freuqncy signal #01 and the #02 place received in default working frequency range.
Particularly, frequency sub-band width value can pre-set, also can according to preset frequency sub-band minimum width value and Breadth Maximum value, and preset step value determine.
Preferably, in order to realize processing various dissimilar intermediate-freuqncy signal, the embodiment of the present invention three proposes a kind of under certain constraints, at random can process the intermediate-freuqncy signal of various different frequency range here.From the elaboration in embodiment one, for the intermediate-freuqncy signal of the different frequency sub-band determined, as long as determine 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 present invention three adopts the formula 1 in above-described embodiment one to determine frequency sub-band width value here, and between each frequency sub-band determined between be separated with default transition frequency range.
Step 4: respectively frequency sub-band down-converted, digital fabrication filtering process and frequency sub-band upconversion process are carried out to the intermediate-freuqncy signal in each frequency sub-band determined.
Particularly, for determining at least one frequency sub-band, adopt direct digital frequency synthesis technology, generate the sinusoidal signal identical with this frequency sub-band frequency and cosine signal, then according to the sinusoidal signal generated and cosine signal, 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 zero-frequency position.Carry out the intermediate-freuqncy signal #01 after frequency sub-band down-converted, carry out filtering process by Filter#01, form independently frequency sub-band intermediate-freuqncy signal #01.Finally subband upconversion process is carried out to the multiple independently frequency sub-band intermediate-freuqncy signals formed, be specially: for a frequency sub-band, adopt direct digital frequency synthesis technology, generate the sinusoidal signal identical with the IF signal frequency of this frequency sub-band and cosine signal, then according to the sinusoidal signal generated and cosine signal, 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 the position to carrying out before down-converted.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, frequency sub-band down-converted is carried out to the intermediate-freuqncy signal of each frequency sub-band determined, when digital fabrication filtering process and frequency sub-band upconversion process, can carry out in a digital processing link, also can carry out in many digital processing links.And, adopt the intermediate-freuqncy signal of direct digital frequency synthesis technology to each frequency sub-band determined carry out frequency sub-band down-converted, digital fabrication filtering process and frequency sub-band upconversion process time, the configuration of each parameter in direct digital frequency synthesis technology is relevant with frequency sub-band width value with the center frequency point of each frequency sub-band determined.Particularly, with the center frequency point shown in Fig. 5 for f1, bin width value is that the intermediate-freuqncy signal of B1 (is abbreviated as f1, B1) be example, set forth under preset parameter respectively and in the configurable situation of parameter, direct digital frequency synthesis technology is adopted to carry out frequency sub-band down-converted to each frequency sub-band intermediate-freuqncy signal, digital fabrication filtering process and frequency sub-band upconversion process process.
First kind of way: under preset parameter, adopts direct digital frequency synthesis technology to carry out frequency sub-band down-converted to each frequency sub-band intermediate-freuqncy signal, the processing procedure of digital fabrication filtering process and frequency sub-band upconversion process.
Adopt direct digital frequency synthesis technology, need to use Direct Digital Synthesizer (DDS, DirectDigitalSynthesizer) and digital fabrication filter.Wherein, DDS generates sine and cosine signal.Particularly, the embodiment of the present invention three adopts two DDS here, a digital formed filter is that example is described in detail, DDS0 and DDS1 as shown in Figure 8.
To (f1, B1) when intermediate-freuqncy signal carries out frequency sub-band down-converted, DDS0 needs generation one and (f1, B1) sinusoidal signal of same frequency and cosine signal, utilize the sinusoidal signal of generation and cosine signal to modulate (f1, B1) intermediate-freuqncy signal, such as, carry out the operations such as multiply-add operation, the center frequency point f1 of (f1, B1) intermediate-freuqncy signal is moved to zero-frequency place.Carry out the intermediate-freuqncy signal (f1, B1) after down-converted, through digital fabrication filter by sideband spurious signal filtering process.Wherein, the parameter of digital fabrication filter is only relevant with the width value of intermediate-freuqncy signal (f1, B1).Carry out the intermediate-freuqncy signal (f1 after digital filtering process, B1), need to carry out frequency sub-band upconversion process, one and (f1 is produced by DDS1, B1) sinusoidal signal of same frequency and cosine signal, utilizes the sinusoidal signal that produces and cosine signal to modulate intermediate-freuqncy signal (f1, B1), the center frequency point f1 of intermediate-freuqncy signal (f1, B1) is moved the position to carrying out before down-converted.
From the above, carrying out in the process of frequency sub-band upconversion process and frequency sub-band down-converted to the intermediate-freuqncy signal of frequency sub-band respectively, DDS0 and DDS1 needs generation 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 the center frequency point determining intermediate-freuqncy signal (f1, B1), just can calculate control word corresponding to DDS0 and DDS1, configure the parameter of DDS0 and DDS1 further according to the control word determined.
Particularly, the calculating of DDS0 and DDS1 parameter can be, but not limited to be completed by devices such as host computer, microcontroller chip or other intelligent chips.
The second way: in the configurable situation of parameter, adopts direct digital frequency synthesis technology to carry out frequency sub-band down-converted, digital fabrication filtering process and frequency sub-band upconversion process process to each frequency sub-band intermediate-freuqncy signal.
Based on the framework shown in Fig. 8, frequency sub-band down-converted is carried out to each frequency sub-band intermediate-freuqncy signal, when digital fabrication filtering process and frequency sub-band upconversion process, the parameter of DDS0 with DDS1 is relevant with the center frequency point of the intermediate-freuqncy signal of each frequency sub-band, the parameter of digital fabrication filter is only relevant with the width value of the intermediate-freuqncy signal of each frequency sub-band, so only need the parameter determining DDS0, DDS1 and digital fabrication filter respectively.
For the communication system adopting repeater as relaying, when system resource and transmission bandwidth allow, the increased number of the digital processing link of system, 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 such as distributed is N bar.For a wherein digital processing link, the width value of the intermediate-freuqncy signal handled by this digital processing link can according to the width value of the frequency sub-band intermediate-freuqncy signal determined, regular change under certain constraints.Such as, when the width value of frequency sub-band is when adopting the formula 1 in above-described embodiment one to calculate, correspondingly, also the width value of the frequency sub-band intermediate-freuqncy signal that this digital processing link can process can be determined by above-mentioned formula 1.
Particularly, for all digital processing links distributed in system, the technical scheme that the embodiment of the present invention all can be adopted here to propose, makes the width value of the intermediate-freuqncy signal handled by each digital processing link can regular change under certain constraints.
More specifically, for the N bar digital processing link distributed, can choose wherein a part of digital processing link adopts the technical scheme of the above-mentioned proposition of the embodiment of the present invention to process intermediate-freuqncy signal, and remaining digital processing link is set to the intermediate-freuqncy signal processing fixed center frequency fixed width value.
Such as, for above-mentioned formula 1, suppose Bmin=10, Bmax=60, default step value Δ b=10, then according to formula 1, the width value of this digital processing link to the frequency sub-band that should be able to process is respectively 10,20,30,40 and 50.Preferably, can also between each width value interval preset frequency range.Such as, predetermined interval frequency range can regularly change, and also can adopt a fixing frequency range value (as Δ B in Fig. 5).Like this, the parameter being arranged on the digital fabrication filter on this digital processing link just can change dynamically.Thus make whole system have very strong flexibility.
Preferably, in actual applications, for digital shaping filter, can adopt FIR filter structure, the parameter of filter can be an array.When ensureing identical frequency sub-band width value, this group parameter is one group of fixing sequence, the corresponding one group of forming filter coefficient (as shown in Figure 9) fixed of width value of each frequency sub-band intermediate-freuqncy signal.Suppose that frequency sub-band width value is not identical, then correspond to N kind digital filter configuration.Now, need the parameter that N group is fixing, because each step value is default, so required N group sequence can be calculated, and be stored in the internal storage of control logic, the parameter that also this can be calculated stores with external memory storage, and the width value of the intermediate-freuqncy signal of the frequency sub-band processed as required carries out adjusting.The characteristic of digital shaping filter can be changed so online, the intermediate-freuqncy signal of dissimilar frequency sub-band can be processed, make system have very strong flexibility.
For the parameter of DDS0 and DDS1, at random can be changed the output frequency of output signal (embodiment of the present invention three exports sinusoidal signal cosine signal here) by the mode changing control word, 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, DDS0 and DDS1 needs the frequency of sinusoidal signal and the cosine signal generated also can determine, and between control word and output frequency, there is linear relationship, therefore can be calculated the control word of frequency sub-band intermediate-freuqncy signal by target output frequency f.
Adopt direct digital frequency synthesis technology, by the configuration to DDS control word, can ensure that digital processing link can process the intermediate-freuqncy signal of different center frequency point, thus add the flexibility of system.Particularly, the calculating of control word can be, but not limited to by host computer or central processing unit (CPU, CentralProcessingUnit) calculate, also can directly at control logic device as field programmable gate array (FPGA, Field-ProgrammableGateArray), the device inside Resource Calculation such as Digital Signal Processing (DSP, DigitalSignalProccessing) or table look-up and obtain the control word of this intermediate-freuqncy signal.
Step 5: each intermediate-freuqncy signal after step 4 process is carried out the process of conjunction road, such as, carry out adduction process, the intermediate-freuqncy signal then after the process of involutory road carries out the filtering process improving signal sampling rate.
Such as, as shown in Figure 7a, carry out the intermediate-freuqncy signal #1 after adduction process carries out improving signal sampling rate filtering process by filter Filter#21, obtain and preset intermediate-freuqncy signal corresponding to working frequency range.
Step 6: the intermediate-freuqncy signal #1 after filtering process in step 5 is carried out broadband upconversion process through analog to digital converter, then transmits.
Particularly, the concrete processing procedure for intermediate-freuqncy signal #2 refers to elaborating intermediate-freuqncy signal #1 processing procedure, repeats no more here.
It should be noted that, the technical scheme that the embodiment of the present invention three proposes here, can be, but not limited to the handling process shown in Fig. 7 a and Fig. 7 b, also can consider according to system internal resources etc., processing procedure is adjusted, the processing procedure to down link such as shown in Figure 10 carries out changing the flow chart after adjustment, and its processing procedure refers to elaborating of the various embodiments described above, repeats no more here.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (11)
1. an IF signal processing method, is characterized in that, comprising:
Adopt frequency sub-band dividing mode, determine the frequency sub-band in the described working frequency range at each intermediate-freuqncy signal place received in default working frequency range;
Respectively frequency sub-band down-converted, digital fabrication filtering process and frequency sub-band upconversion process are carried out to the intermediate-freuqncy signal in each frequency sub-band determined;
Each intermediate-freuqncy signal after process is carried out the process of conjunction road, obtain and preset intermediate-freuqncy signal corresponding to working frequency range;
Wherein, determine the frequency sub-band in the described working frequency range at each intermediate-freuqncy signal place, comprise: according to frequency sub-band width value and frequency sub-band center frequency point, employing frequency sub-band dividing mode determines the frequency sub-band in the described working frequency range at each intermediate-freuqncy signal place received in default working frequency range; Described frequency sub-band width value is frequency sub-band minimum width value according to presetting and Breadth Maximum value, and the step value preset is determined, adopts following formula determination 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 width value of frequency sub-band to be divided, B
maxbe the Breadth Maximum value of frequency sub-band to be divided, Δ b is default step value.
2. the method for claim 1, is characterized in that, before determining the frequency sub-band in the described working frequency range at each intermediate-freuqncy signal place, also comprises:
Broadband down-converted, the filtering process reducing signal sampling rate, public radio interface CPRI framing and CPRI are carried out together to all intermediate-freuqncy signals in default working frequency range and separates frame process.
3. the method for claim 1, is characterized in that, each intermediate-freuqncy signal after process is carried out the process of conjunction road, also comprises:
Intermediate-freuqncy signal after the process of involutory road carries out the filtering process improving signal sampling rate.
4. the method for claim 1, is characterized in that, is separated with default transition frequency range between the described each frequency sub-band determined.
5. the method for claim 1, is characterized in that, carries out frequency sub-band down-converted, comprising the intermediate-freuqncy signal in frequency sub-band:
For a frequency sub-band, adopt direct digital frequency synthesis technology, generate the sinusoidal signal identical with this frequency sub-band frequency and cosine signal;
According to the sinusoidal signal generated and cosine signal, 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 zero-frequency position.
6. the method for claim 1, is characterized in that, carries out frequency sub-band upconversion process, comprising the intermediate-freuqncy signal in frequency sub-band:
For a frequency sub-band, adopt direct digital frequency synthesis technology, generate the sinusoidal signal identical with the IF signal frequency of this frequency sub-band and cosine signal;
According to the sinusoidal signal generated and cosine signal, 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 the position to carrying out before down-converted.
7. a signal process unit of intermediate frequency, is characterized in that, comprising:
Determining unit, for adopting frequency sub-band dividing mode, determines the frequency sub-band in the described working frequency range at each intermediate-freuqncy signal place received in default working frequency range;
Frequency sub-band processing unit, carries out frequency sub-band down-converted, digital fabrication filtering process and frequency sub-band upconversion process for the intermediate-freuqncy signal in each frequency sub-band of determining determining unit respectively;
Close road processing unit, for each intermediate-freuqncy signal after frequency sub-band processing unit processes being carried out the process of conjunction road, obtaining and presetting intermediate-freuqncy signal corresponding to working frequency range;
Described determining unit, specifically for according to frequency sub-band width value and frequency sub-band center frequency point, adopts the frequency sub-band that frequency sub-band dividing mode is determined in the described working frequency range at each intermediate-freuqncy signal place received in default working frequency range; Described determining unit, the frequency sub-band minimum width value preset specifically for basis and Breadth Maximum value, and the step value preset, determine the width value of frequency sub-band, described determining unit specifically adopts following formula determination 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 width value of frequency sub-band to be divided, B
maxbe the Breadth Maximum value of frequency sub-band to be divided, Δ b is default step value.
8. device as claimed in claim 7, is characterized in that, also comprise:
The Wideband Signal Processing unit, separates frame process for carrying out broadband down-converted, the filtering process reducing signal sampling rate, public radio interface CPRI framing and CPRI together to all intermediate-freuqncy signals in default working frequency range.
9. device as claimed in claim 8, is characterized in that, described conjunction road processing unit, also carries out for the intermediate-freuqncy signal after the process of involutory road the filtering process improving signal sampling rate.
10. device as claimed in claim 7, is characterized in that, described frequency sub-band processing unit, specifically for for a frequency sub-band, adopts direct digital frequency synthesis technology, generates the sinusoidal signal identical with this frequency sub-band frequency and cosine signal; And according to the sinusoidal signal generated and cosine signal, 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 zero-frequency position.
11. devices as claimed in claim 7, is characterized in that, described frequency sub-band processing unit, specifically for for a frequency sub-band, adopt direct digital frequency synthesis technology, generate the sinusoidal signal identical with the IF signal frequency of this frequency sub-band and cosine signal; And according to the sinusoidal signal generated and cosine signal, 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 the position to carrying out before down-converted.
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| 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 |
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| 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 |
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