CN101841372A - Method for implementing continuous carrier frequency configuration for CDMA (Code Division Multiple Address) digital optical fiber repeater - Google Patents
Method for implementing continuous carrier frequency configuration for CDMA (Code Division Multiple Address) digital optical fiber repeater Download PDFInfo
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Abstract
The invention relates to a method for implementing continuous carrier frequency configuration for a CDMA digital optical fiber repeater, which comprises the following steps of: judging the currently used frequency point number, the number S of frequency points and n continuous carrier frequency manners according to the carrier frequency configuration of the superior network management by the CDMA digital optical fiber repeater, wherein n is a natural number arranging from 1 to 7, judging and recording the number of the carrier frequencies used and the distribution of the continuous carrier frequencies by sequencing the frequency number and detecting the difference, calculating the configuration parameters of a digital mixer and the configuration bandwidth of a digital filter, treating the continuous carrier frequencies as one carrier frequency, using one mixing configuration parameter; reconstructing the used digital filter according to the configuration parameters of the digital mixer and the configuration bandwidth of the used digital filter to implement variable signal processing bandwidth and process different carrier frequency configuration manners; and accumulating data for different signal bandwidth processing channels to process a signal carrier frequency and various different continuous carrier frequencies. The invention is flexible and simple and has strong adaptability.
Description
Technical field
The present invention relates to the method that a kind of CDMA digital optical fiber direct station realizes that continuous carrier is provided with.
Background technology
The CDMA digital optical fiber direct station is to adopt software and radio technique, with the digitlization of CDMA Um mouth signal, is sent to far-end by optical fiber, utilizes remote radio unit (RRU) regeneration, amplifies, and realizes that base station signal zooms out the wireless network overlay device of covering.This system utilizes the method for software radio signal digitalized RF, at numeric field signal is handled, and has greatly strengthened equipment to Signal Processing and control ability.Adopt digital filter can obtain better Filtering Processing ability, be easy to upgrade maintenance and function and expand.
CDMA is a kind of access mode based on the wide-band spread spectrum technology, and it can come the Signal Separation that is in identical time slot and frequency, and wherein all signals are shared identical frequency spectrum, and the signal energy of each travelling carriage is dispensed in the whole frequency band scope.The operating frequency of China's cdma system is: it is 825M-835M that frequency is received in the base station, and it is 870M-880M that frequency is sent out in the base station, has 7 carrier frequency shown in Fig. 2 a, and channel spacing is 1.23M.Usually 3 to 4 carrier frequency are only used in the sub-district of cdma network covering, and the carrier frequency separation setting.If support the sub-district that 5 carrier frequency are above, then continuous frequency must occur.The chip-rate of CDMA is 1.2288M, if require directly filtering differentiation of adjacent frequency, then the filter transition band of Shi Yonging is very precipitous, and this just must use the filter on high rank, it is many and time delay is very big to cause expending hardware resource, can't realize in fact at all.
Summary of the invention
Purpose of the present invention is in order to overcome problem and the shortcoming that above-mentioned prior art exists, and provide a kind of new simple can the CDMA digital optical fiber direct station realize the method that continuous carrier is provided with, this method realizes the Filtering Processing ability to the CDMA continuous carrier, in fact can handle any carrier frequency number and carrier frequency set-up mode, and this method is simple flexibly, and adaptability is strong.
Technical scheme of the present invention:
The CDMA digital optical fiber direct station is realized the method that continuous carrier is provided with, and it is characterized in that carrying out according to the following steps:
The first step, the CDMA digital optical fiber direct station is according to the carrier frequency setting of upper strata webmaster, judge current use frequency point number, frequency points S and n continuous carrier mode, n is the natural number of 1-7, for 7 carrier frequency of CDMA, the frequency point number that base station transceiver distributes is 37,78,119,160,201,242,283; The CDMA digital optical fiber direct station detects by ordering and the difference to frequency point number, judges the number of carrier frequency use and the distribution situation of continuous carrier;
Second step, the CDMA digital optical fiber direct station is finished after the judgement of current use frequency point number, frequency points S and n continuous carrier mode and record, calculate the bandwidth that is provided with that parameter and digital filter are set of digital mixer, continuous carrier frequency is used as a carrier frequency handles, use a mixing that parameter is set;
The 3rd step, the CDMA digital optical fiber direct station is according to the bandwidth that parameter and digital filter are set of the digital mixer that is provided with, the digital filter that uses is reconstructed, realizes variable signal processing bandwidth, realize disposal ability different carrier frequency set-up modes;
In the 4th step, the CDMA digital optical fiber direct station carries out data accumulation for different signal bandwidth treatment channel, thereby realizes the disposal ability of single-carrier frequency and various different continuous carriers.
The concrete grammar of the described first step is: (1), CDMA digital optical fiber direct station add the frequency point number ordering to be handled, and is exactly according to ordering from small to large to the frequency point number that is provided with; (2), find out continuous carrier: CDMA totally 7 carrier frequency, and each carrier frequency separation is 41 frequencies, as finds to be separated by 41 between two frequencies, then is continuous, otherwise is not continuous just; (3), the CDMA digital optical fiber direct station recomputates carrier frequency frequency point number and frequency points, if single carrier frequency, then frequency point number is constant, if found out n continuous carrier, n=1,2,3,4,5,6,7, then calculate the center frequency point of carrier frequency, and n continuous carrier is used as a carrier frequency handles, frequency points becomes S-n+1; (4), carrier frequency frequency point number after will handling and frequency points and n continuous carrier mode reference record are preserved so that next step processing.
The bandwidth concrete grammar that is provided with of the filter in described second step is: the transition band width of digital filter is that the width of 1 standard carrier frequency is 1.23M, the filter pass band of digital filter is the width of actual continuous carrier, the signal passband of the carrier frequency digital filter of n continuous carrier is used the filtering bandwidth n * 1.23M of n carrier frequency, begin signal is realized complete inhibition that n is the natural number of 1-7 from 1.23M* (n+1).
The parameter concrete grammar that is provided with of the digital mixer in described second step is: digital mixer is realized digital medium-frequency signal moving from the intermediate frequency to the zero-frequency, it is different that different carrier frequency corresponds to the spectral distance of zero-frequency, if what handle is single carrier frequency, then the parameter of digital mixer is set to the distance of this carrier frequency apart from zero-frequency, if what handle is continuous carrier more than 2, then divide the odd even situation of the number of continuous carrier to carry out relevant treatment: when the number of continuous carrier was odd number, the parameter that digital mixer then is set was the distance that benchmark just is set to middle carrier frequency and zero-frequency with middle that carrier frequency; When the number of continuous carrier was even number, the parameter that digital mixer then is set was the distance of benchmark and zero-frequency with the centre position of middle two frequencies.
The concrete grammar in described the 3rd step is: get access to the relevant parameter of digital mixer parameter and digital filter bandwidth when the CDMA digital optical fiber direct station after, if the discontented lumping weight structure condition of digital filter does not just need reconstruct; If digital filter satisfies reconstruction condition, then the CDMA digital optical fiber direct station reads in relevant digital mixer parameter and digital filter bandwidth parameter, start the program of digital filter reconstruct then, digital filter is updated to the digital filter that can handle correlation bandwidth, carries out correct Frequency mixing processing simultaneously; Digital filter design becomes 4 road signal processing channels parallel, each signal processing channel all can guarantee to handle at most 7 continuous carriers, promptly the intermediate-freuqncy signal of the 10M bandwidth that CDMA is distributed is selected band, minimumly can handle an independent interval carrier frequency, 4 road signal processing channels might not always use simultaneously, when frequency point number is set to the carrier frequency at 4 intervals, so just can use 4 signal processing channels, each signal processing channel is by the base-band digital filter, fixedly multiple interpolation filter, digital mixer are connected in turn, and each situation is analyzed as follows respectively:
Single carrier frequency: use a signal processing channel, digital filter coefficient is updated to supports a carrier frequency at interval, realizes single carrier frequency support;
2 carrier frequency: if 2 carrier frequency are discontinuous, use two signal processing channels, digital filter coefficient is updated to supports a carrier frequency at interval; If 2 carrier frequency are continuous, use a signal processing channel, digital filter coefficient is updated to supports 2 continuous carriers;
3 carrier frequency: 3 interval carrier frequency, use 3 signal processing channels, digital filter coefficient is updated to supports a carrier frequency at interval; 1 interval carrier frequency and 2 continuous carriers use 2 signal processing channels, and a digital filter coefficient update is for supporting a carrier frequency at interval, and another digital filter is updated to supports 2 continuous carriers;
4 carrier frequency: 4 interval carrier frequency, use 4 signal processing channels, digital filter coefficient is updated to supports a carrier frequency at interval; 1 interval carrier frequency and 3 continuous carriers use 2 signal processing channels, and a digital filter coefficient update is for supporting a carrier frequency at interval, and another digital filter is updated to supports 3 continuous carriers; 2 interval carrier frequency and 2 continuous carriers use 3 signal processing channels, and two digital filter coefficient updates are for supporting a carrier frequency at interval, and another digital filter is updated to supports 2 continuous carriers; 22 continuous carriers use 2 signal processing channels, and two digital filter coefficients all are updated to supports 2 continuous carriers;
5 carrier frequency: 1 single-carrier frequency and 2 continuous in twos carrier frequency, use 3 signal processing channels, a digital filter coefficient update is for supporting a carrier frequency at interval, two filter updates of numeral are for supporting 2 continuous carriers in addition; One two continuous carrier and one 3 continuous carrier use 2 signal processing channels, and a digital filter coefficient update is for supporting two continuous carriers, and another digital filter is updated to supports 3 continuous carriers; 2 single-carrier frequencies and 13 continuous carrier frequency use 3 signal processing channels, and two digital filter coefficient updates are for supporting a carrier frequency at interval, and another digital filter is updated to supports 3 continuous carriers;
6 carrier frequency: 1 single-carrier frequency and one 5 continuous carrier, use 2 signal processing channels, a digital filter coefficient update is for supporting a carrier frequency at interval, another digital filter is updated to supports 5 continuous carriers; One 2 continuous carrier and one 4 continuous carrier use 2 signal processing channels, and a digital filter coefficient update is for supporting 2 continuous carriers, and another digital filter is updated to supports 4 continuous carriers; Two 3 continuous carriers use 2 signal processing channels, all are updated to support 3 continuous carriers; 6 continuous carriers use a signal processing channel, and digital filter is updated to supports 6 continuous carriers;
7 carrier frequency: have only a kind of situation, use a signal processing channel, digital filter is updated to direct signal to the 10M bandwidth and selects tape handling.
The concrete grammar in described the 4th step is: after 4 signal processing channel parallel processings of digital filter, for the signal downlink link, the parallel optical interface module that sends to of baseband signal, for the signal uplink link, baseband signal by digital mixer with the base band data frequency spectrum shift to intermediate frequency, at last signal is added up, the signal of summation is carried out cut position and round off to handle sending to digital-to-analogue DAC unit and finishing digital-to-analogue conversion.
Adopt the advantage of CDMA digital optical fiber direct station of the present invention to be: can pass through the processing of the installation procedure software realization of CDMA digital optical fiber direct station to the cdma system continuous carrier, the implementation simple and flexible, the carrier frequency disposal ability is variable in real time.
Description of drawings
Fig. 1 is CDMA frequency point setting analysis process figure.
Fig. 2 a is cdma network carrier frequency distribution figure.
Fig. 2 b be 3 connect the carrier frequency central points the mixing parameter schematic diagram is set.
Fig. 2 c be 2 connect the carrier frequency central points the mixing parameter schematic diagram is set.
Fig. 3 is a digital filter filter reconstruct flow chart.
Fig. 4 a is the digital signal processing unit configuration diagram of up link.
Fig. 4 b is the digital signal processing unit configuration diagram of down link.
Fig. 5 is the signal processing Organization Chart of CDMA digital optical fiber direct station.
Embodiment
In order to make the solution of the present invention more cheer and bright, the present invention is described in more detail below in conjunction with example.
As shown in Figure 1, the first step, the CDMA digital optical fiber direct station is according to the carrier frequency setting of upper strata webmaster, judge current use frequency point number, frequency points S and n continuous carrier mode, n is the natural number of 1-7, for 7 carrier frequency of CDMA, the frequency point number that base station transceiver distributes is 37,78,119,160,201,242,283; The CDMA digital optical fiber direct station detects by ordering and the difference to frequency point number, judges the number of carrier frequency use and the distribution situation of continuous carrier; Among the present invention, frequency is handled function improve to some extent: (1), CDMA digital optical fiber direct station add the frequency point number ordering to be handled, and is exactly according to ordering from small to large to the frequency point number that is provided with; (2), find out continuous carrier: CDMA totally 7 carrier frequency, and each carrier frequency separation is 41 frequencies, as finds to be separated by 41 between two frequencies, then is continuous, otherwise is not continuous just; (3), the CDMA digital optical fiber direct station recomputates carrier frequency frequency point number and frequency points, if single carrier frequency, then frequency point number is constant, if found out n continuous carrier, n=1,2,3,4,5,6,7, then calculate the center frequency point of carrier frequency, and n continuous carrier is used as a carrier frequency handles, frequency points becomes S-n+1; (4), carrier frequency frequency point number after will handling and frequency points and n continuous carrier mode reference record are preserved so that next step processing.Analyze accompanying drawing 1 and can see CDMA frequency point setting analysis process.
Second step, the CDMA digital optical fiber direct station is finished after the judgement of current use frequency point number, frequency points S and n continuous carrier mode and record, calculate the bandwidth that is provided with that parameter and digital filter are set of digital mixer, continuous carrier frequency is used as a carrier frequency handles, use a mixing that parameter is set; Because the restriction of CDMA digital optical fiber direct station hardware resource and the requirement of processing delay, Design of Digital Filter all are to allow the transition band width of signal be that the width of 1 standard carrier frequency is 1.23M, the digital filter filter pass band is the width of actual continuous carrier; Specific implementation is, behind the set-up mode that decomposites single-carrier frequency or n continuous carrier mode; For single carrier frequency, filter pass band is 1 standard carrier frequency width, i.e. 1.23M, and transition band is 1.23M, begins signal is realized complete inhibition from 2.46M; And for n continuous carrier mode, filter pass band is a n standard carrier frequency width, i.e. 1.23M*n, and transition band is 1.23M, begins signal is realized complete inhibition from 1.23M* (n+1); Digital mixing is realized digital medium-frequency signal moving from the intermediate frequency to the zero-frequency, it is different that different carrier frequency corresponds to the spectral distance of zero-frequency, if what handle is single carrier frequency, then the parameter of digital mixer is set to the distance of this carrier frequency apart from zero-frequency, if what handle is continuous carrier more than 2, then divide the odd even situation of the number of continuous carrier to carry out relevant treatment: when the number of continuous carrier is odd number, shown in Fig. 2 b, the parameter that digital mixer then is set is the distance that benchmark just is set to middle carrier frequency and zero-frequency with middle that carrier frequency; When the number of continuous carrier was even number, shown in Fig. 2 c, the parameter that digital mixer then is set was the distance of benchmark and zero-frequency with the centre position of middle two frequencies.
The 3rd step, get access to the relevant parameter of digital mixer parameter and digital filter bandwidth when the CDMA digital optical fiber direct station after, as shown in Figure 3, if the discontented lumping weight structure condition of digital filter does not just need reconstruct; If digital filter satisfies reconstruction condition, then the CDMA digital optical fiber direct station reads in relevant digital mixer parameter and digital filter bandwidth parameter, start the program of digital filter reconstruct then, digital filter is updated to the digital filter that can handle correlation bandwidth, carries out correct Frequency mixing processing simultaneously; This reconstruction progress both can be moved when equipment begins to start, and finished that disposable that the back is set is constant with regard to fixed characteristic, also can be in equipment operation real-time update, so have extremely strong flexibility.Shown in Figure 4, in order to guarantee that the condition that all carrier frequency to maximum 7 carrier frequency are provided with situation can both satisfy, it is parallel then to be designed to 4 road signal processing channels, digital filter design becomes 4 road signal processing channels parallel, each signal processing channel all can guarantee to handle at most 7 continuous carriers, promptly the intermediate-freuqncy signal of the 10M bandwidth that CDMA is distributed is selected band, minimumly can handle an independent interval carrier frequency, 4 road signal processing channels might not always use simultaneously, when frequency point number is set to the carrier frequency at 4 intervals, so just can use 4 signal processing channels, Fig. 4 a, shown in Fig. 4 b, each signal processing channel is by the base-band digital filter, fixing multiple interpolation filter, digital mixer is connected in turn, four signal processing channels of up link all are connected with sum unit, sum unit is connected with the digital analog interface unit again, by the digital analog interface unit signal is sent; Four signal processing of down link are sent into optical interface after connecting and receiving the signal processing of sending the A/D interface unit, by optical interface signal are sent, and each situation is analyzed as follows respectively:
Single carrier frequency: use a signal processing channel, digital filter coefficient is updated to supports a carrier frequency at interval, realizes single carrier frequency support;
2 carrier frequency: if 2 carrier frequency are discontinuous, use two signal processing channels, digital filter coefficient is updated to supports a carrier frequency at interval; If 2 carrier frequency are continuous, use a signal processing channel, digital filter coefficient is updated to supports 2 continuous carriers;
3 carrier frequency: 3 interval carrier frequency, use 3 signal processing channels, digital filter coefficient is updated to supports a carrier frequency at interval; 1 interval carrier frequency and 2 continuous carriers use 2 signal processing channels, and a digital filter coefficient update is for supporting a carrier frequency at interval, and another digital filter is updated to supports 2 continuous carriers;
4 carrier frequency: 4 interval carrier frequency, use 4 signal processing channels, digital filter coefficient is updated to supports a carrier frequency at interval; 1 interval carrier frequency and 3 continuous carriers use 2 signal processing channels, and a digital filter coefficient update is for supporting a carrier frequency at interval, and another digital filter is updated to supports 3 continuous carriers; 2 interval carrier frequency and 2 continuous carriers use 3 signal processing channels, and two digital filter coefficient updates are for supporting a carrier frequency at interval, and another digital filter is updated to supports 2 continuous carriers; 22 continuous carriers use 2 signal processing channels, and two digital filter coefficients all are updated to supports 2 continuous carriers;
5 carrier frequency: 1 single-carrier frequency and 2 continuous in twos carrier frequency, use 3 signal processing channels, a digital filter coefficient update is for supporting a carrier frequency at interval, two filter updates of numeral are for supporting 2 continuous carriers in addition; One two continuous carrier and one 3 continuous carrier use 2 signal processing channels, and a digital filter coefficient update is for supporting two continuous carriers, and another digital filter is updated to supports 3 continuous carriers; 2 single-carrier frequencies and 13 continuous carrier frequency use 3 signal processing channels, and two digital filter coefficient updates are for supporting a carrier frequency at interval, and another digital filter is updated to supports 3 continuous carriers;
6 carrier frequency: 1 single-carrier frequency and one 5 continuous carrier, use 2 signal processing channels, a digital filter coefficient update is for supporting a carrier frequency at interval, another digital filter is updated to supports 5 continuous carriers; One 2 continuous carrier and one 4 continuous carrier use 2 signal processing channels, and a digital filter coefficient update is for supporting 2 continuous carriers, and another digital filter is updated to supports 4 continuous carriers; Two 3 continuous carriers use 2 signal processing channels, all are updated to support 3 continuous carriers; 6 continuous carriers use a signal processing channel, and digital filter is updated to supports 6 continuous carriers;
7 carrier frequency: have only a kind of situation, use a signal processing channel, digital filter is updated to direct signal to the 10M bandwidth and selects tape handling.
The 4th step, after 4 signal processing channel parallel processings of digital filter, for the signal downlink link, the parallel optical interface module that sends to of baseband signal, for the signal uplink link, baseband signal by digital mixer with the base band data frequency spectrum shift to intermediate frequency, at last signal is added up, the signal of summation is carried out cut position and rounds off to handle sending to digital-to-analogue DAC interface unit and finishing digital-to-analogue conversion.CDMA digital optical fiber direct station structure as shown in Figure 5, comprise proximal fiber machine and optical fiber remote termination, the proximal fiber machine is connected and is formed by modulus ADC interface unit, signal processing unit, descending optical interface, up optical interface, another signal processing unit, digital-to-analogue DAC interface unit, and the optical fiber remote termination is connected and is formed by modulus ADC interface unit, signal processing unit, up optical interface, descending optical interface, another signal processing unit, digital-to-analogue DAC interface unit; The up link of proximal fiber machine and optical fiber remote termination is: upstream data successively through the modulus ADC of optical fiber remote termination interface unit, signal processing unit, up optical interface to the proximal fiber machine, and successively through the up optical interface of proximal fiber machine, another signal processing unit, digital-to-analogue DAC interface unit; The down link of proximal fiber machine and optical fiber remote termination is: downlink data successively through the modulus ADC of proximal fiber machine interface unit, signal processing unit, descending optical interface to the optical fiber remote termination, and successively through the descending optical interface of optical fiber remote termination, another signal processing unit, digital-to-analogue DAC interface unit.
The software processes algorithm that the present invention is designed into is the base-band digital filter unit in signal processing unit all.The base station down data send to the repeater far-end unit through after mixing, extraction and the base-band digital filtering of down link by the optical interface module, are accomplished to the digital-to-analogue conversion process of intermediate frequency behind base-band digital filtering, interpolation and the mixing of upstream data process up link and the summation module by the DAC interface module.
Claims (6)
1.CDMA digital optical fiber direct station is realized the method that continuous carrier is provided with, and it is characterized in that carrying out according to the following steps:
The first step, the CDMA digital optical fiber direct station is according to the carrier frequency setting of upper strata webmaster, judge current use frequency point number, frequency points S and n continuous carrier mode, n is the natural number of 1-7, the CDMA digital optical fiber direct station detects by ordering and the difference to frequency point number, judges the number of carrier frequency use and the distribution situation of continuous carrier;
Second step, the CDMA digital optical fiber direct station is finished after the judgement of current use frequency point number, frequency points S and n continuous carrier mode and record, calculate the bandwidth that is provided with that parameter and digital filter are set of digital mixer, continuous carrier frequency is used as a carrier frequency handles, use a mixing that parameter is set;
The 3rd step, the CDMA digital optical fiber direct station is according to the bandwidth that parameter and digital filter are set of the digital mixer that is provided with, the digital filter that uses is reconstructed, realizes variable signal processing bandwidth, realize disposal ability different carrier frequency set-up modes;
In the 4th step, the CDMA digital optical fiber direct station carries out data accumulation for different signal bandwidth treatment channel, thereby realizes the disposal ability of single-carrier frequency and various different continuous carriers.
2. method according to claim 1 is characterized in that: the concrete grammar of the described first step is: (1), CDMA digital optical fiber direct station add the frequency point number ordering to be handled, and is exactly according to ordering from small to large to the frequency point number that is provided with; (2), find out continuous carrier: CDMA totally 7 carrier frequency, and each carrier frequency separation is 41 frequencies, as finds to be separated by 41 between two frequencies, then is continuous, otherwise is not continuous just; (3), the CDMA digital optical fiber direct station recomputates carrier frequency frequency point number and frequency points, if single carrier frequency, then frequency point number is constant, if found out n continuous carrier, n=1,2,3,4,5,6,7, then calculate the center frequency point of carrier frequency, and n continuous carrier is used as a carrier frequency handles, frequency points becomes S-n+1; (4), carrier frequency frequency point number after will handling and frequency points and n continuous carrier mode reference record are preserved so that next step processing.
3. method according to claim 1, it is characterized in that: the bandwidth concrete grammar that is provided with of the filter in described second step is: the transition band width of digital filter is that the width of 1 standard carrier frequency is 1.23M, the filter pass band of digital filter is the width of actual continuous carrier, the signal passband of the carrier frequency digital filter of n continuous carrier is used the filtering bandwidth n * 1.23M of n carrier frequency, begin signal is realized complete inhibition that n is the natural number of 1-7 from 1.23M* (n+1).
4. method according to claim 1, it is characterized in that: the parameter concrete grammar that is provided with of the digital mixer in described second step is: digital mixer is realized digital medium-frequency signal moving from the intermediate frequency to the zero-frequency, it is different that different carrier frequency corresponds to the spectral distance of zero-frequency, if what handle is single carrier frequency, then the parameter of digital mixer is set to the distance of this carrier frequency apart from zero-frequency, if what handle is continuous carrier more than 2, then divide the odd even situation of the number of continuous carrier to carry out relevant treatment: when the number of continuous carrier was odd number, the parameter that digital mixer then is set was the distance that benchmark just is set to middle carrier frequency and zero-frequency with middle that carrier frequency; When the number of continuous carrier was even number, the parameter that digital mixer then is set was the distance of benchmark and zero-frequency with the centre position of middle two frequencies.
5. method according to claim 1, it is characterized in that: the concrete grammar in described the 3rd step is: get access to the relevant parameter of digital mixer parameter and digital filter bandwidth when the CDMA digital optical fiber direct station after, if digital filter is discontented with lumping weight structure condition, just do not need reconstruct; If digital filter satisfies reconstruction condition, then the CDMA digital optical fiber direct station reads in relevant digital mixer parameter and digital filter bandwidth parameter, start the program of digital filter reconstruct then, digital filter is updated to the digital filter that can handle correlation bandwidth, carries out correct Frequency mixing processing simultaneously; Digital filter design becomes 4 road signal processing channels parallel, each signal processing channel all can guarantee to handle at most 7 continuous carriers, promptly the intermediate-freuqncy signal of the 10M bandwidth that CDMA is distributed is selected band, minimumly can handle an independent interval carrier frequency, 4 road signal processing channels might not always use simultaneously, when frequency point number is set to the carrier frequency at 4 intervals, so just can use 4 signal processing channels, each signal processing channel is by the base-band digital filter, fixedly multiple interpolation filter, digital mixer are connected in turn, and each situation is analyzed as follows respectively:
Single carrier frequency: use a signal processing channel, digital filter coefficient is updated to supports a carrier frequency at interval, realizes single carrier frequency support;
2 carrier frequency: if 2 carrier frequency are discontinuous, use two signal processing channels, digital filter coefficient is updated to supports a carrier frequency at interval; If 2 carrier frequency are continuous, use a signal processing channel, digital filter coefficient is updated to supports 2 continuous carriers;
3 carrier frequency: 3 interval carrier frequency, use 3 signal processing channels, digital filter coefficient is updated to supports a carrier frequency at interval; 1 interval carrier frequency and 2 continuous carriers use 2 signal processing channels, and a digital filter coefficient update is for supporting a carrier frequency at interval, and another digital filter is updated to supports 2 continuous carriers;
4 carrier frequency: 4 interval carrier frequency, use 4 signal processing channels, digital filter coefficient is updated to supports a carrier frequency at interval; 1 interval carrier frequency and 3 continuous carriers use 2 signal processing channels, and a digital filter coefficient update is for supporting a carrier frequency at interval, and another digital filter is updated to supports 3 continuous carriers; 2 interval carrier frequency and 2 continuous carriers use 3 signal processing channels, and two digital filter coefficient updates are for supporting a carrier frequency at interval, and another digital filter is updated to supports 2 continuous carriers; 22 continuous carriers use 2 signal processing channels, and two digital filter coefficients all are updated to supports 2 continuous carriers;
5 carrier frequency: 1 single-carrier frequency and 2 continuous in twos carrier frequency, use 3 signal processing channels, a digital filter coefficient update is for supporting a carrier frequency at interval, two filter updates of numeral are for supporting 2 continuous carriers in addition; One two continuous carrier and one 3 continuous carrier use 2 signal processing channels, and a digital filter coefficient update is for supporting two continuous carriers, and another digital filter is updated to supports 3 continuous carriers; 2 single-carrier frequencies and 13 continuous carrier frequency use 3 signal processing channels, and two digital filter coefficient updates are for supporting a carrier frequency at interval, and another digital filter is updated to supports 3 continuous carriers;
6 carrier frequency: 1 single-carrier frequency and one 5 continuous carrier, use 2 signal processing channels, a digital filter coefficient update is for supporting a carrier frequency at interval, another digital filter is updated to supports 5 continuous carriers; One 2 continuous carrier and one 4 continuous carrier use 2 signal processing channels, and a digital filter coefficient update is for supporting 2 continuous carriers, and another digital filter is updated to supports 4 continuous carriers; Two 3 continuous carriers use 2 signal processing channels, all are updated to support 3 continuous carriers; 6 continuous carriers use a signal processing channel, and digital filter is updated to supports 6 continuous carriers;
7 carrier frequency: have only a kind of situation, use a signal processing channel, digital filter is updated to direct signal to the 10M bandwidth and selects tape handling.
6. method according to claim 1, it is characterized in that: the concrete grammar in described the 4th step is: after 4 signal processing channel parallel processings of digital filter, for the signal downlink link, the parallel optical interface module that sends to of baseband signal, for the signal uplink link, baseband signal by digital mixer with the base band data frequency spectrum shift to intermediate frequency, at last signal is added up, the signal of summation is carried out cut position and rounds off to handle sending to digital-to-analogue DAC unit and finishing digital-to-analogue conversion.
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| CN107506551A (en) * | 2017-08-25 | 2017-12-22 | 海能达通信股份有限公司 | A kind of design method and relevant device of channel forming wave filter |
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| WO2008145917A2 (en) * | 2007-05-11 | 2008-12-04 | France Telecom | Method for transmitting and receiving a multicarrier spread-spectrum signal and corresponding signal, computer program products and transmission and reception devices |
| CN101394199A (en) * | 2008-10-30 | 2009-03-25 | 中兴通讯股份有限公司 | Method for data transmission in large bandwidth system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553489A (en) * | 2015-12-09 | 2016-05-04 | 灵芯微电子科技（苏州）有限公司 | Method of OFDM system digital base-band receiver for carrying out direct-current elimination |
| CN107506551A (en) * | 2017-08-25 | 2017-12-22 | 海能达通信股份有限公司 | A kind of design method and relevant device of channel forming wave filter |
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