CN110958052A - Time division radio frequency remote unit with narrow band and multiple sub-bands and method for separating and combining sub-bands - Google Patents
Time division radio frequency remote unit with narrow band and multiple sub-bands and method for separating and combining sub-bands Download PDFInfo
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- CN110958052A CN110958052A CN201811057808.8A CN201811057808A CN110958052A CN 110958052 A CN110958052 A CN 110958052A CN 201811057808 A CN201811057808 A CN 201811057808A CN 110958052 A CN110958052 A CN 110958052A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
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- H—ELECTRICITY
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- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
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- H03D7/161—Multiple-frequency-changing all the frequency changers being connected in cascade
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Abstract
The invention discloses a narrow-band multi-sub-band time division radio frequency remote unit and a sub-band separation and combination method, wherein the narrow-band multi-sub-band time division radio frequency remote unit comprises a multi-channel direct digital frequency synthesizer group, a downlink digital up-converter unit, an uplink digital down-converter unit, a multiplier group for downlink sub-band combination, a multiplier group for uplink sub-band separation and an accumulator. The invention can save a large amount of hardware resources and logic resources in the application scene of the super multi-carrier by multiplexing the direct digital frequency synthesizer group.
Description
Technical Field
The invention relates to a sub-band (carrier) separating and combining scheme, in particular to a sub-band (carrier) separating and combining scheme of a time division radio frequency remote unit of a narrow-band ultra-multi sub-band.
Background
Radio remote units have a significant position in the field of wireless communication. The radio remote unit mainly completes the following functions: the downlink part carries out digital up-conversion on serial baseband data transmitted by the baseband unit through optical fibers, the serial baseband data are finally converted into intermediate-frequency digital signals, the intermediate-frequency digital signals are converted into analog signals through a DAC (digital-to-analog converter), and the analog signals are finally transmitted out through an antenna after being up-converted and amplified by the radio frequency part; and the reverse uplink part receives user signals, amplifies the user signals by the radio frequency part, converts the user signals into intermediate frequency analog signals by down conversion, converts the intermediate frequency analog signals into digital intermediate frequency signals by the ADC, and finally converts the digital intermediate frequency signals into serial baseband signals by digital down conversion and transmits the serial baseband signals to the baseband unit by optical fibers.
Digital up-conversion and digital down-conversion are the most basic functions of a radio remote unit. The digital up-conversion mainly completes the data rate increase of baseband zero-frequency signals and the moving separation of sub-band (carrier) frequency points so as to realize the combination of the sub-bands, and the digital down-conversion mainly completes the data rate reduction of intermediate-frequency digital signals and the return-to-zero of the sub-band frequency points so as to realize the separation of the sub-bands. The separation and combination of sub-bands is an important part of digital intermediate frequency, and a large amount of hardware resources and logic resources are consumed by using a large amount of direct digital frequency synthesizers for the application of super-multiple sub-bands. Therefore, how to save hardware resources and resources of logic processing under the condition that the performance is satisfied by reasonable design in the application of the super-subband is a topic worthy of intensive study.
Disclosure of Invention
The invention aims to provide a sub-band separating and combining method of a narrow-band multi-sub-band time division radio frequency remote unit, which saves a large amount of hardware resources and logic resources by sharing a multi-channel direct digital frequency synthesizer group by an uplink and a downlink and balancing the speed and the area.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a narrow-band multi-sub-band time division radio remote unit for realizing sub-band separation and combination is provided, which comprises:
the multichannel direct digital frequency synthesizer group comprises a plurality of multichannel direct digital frequency synthesizers, is used for providing single tone signals required by moving subband frequency points and respectively synchronizes uplink data and downlink data through an output flag bit;
the downlink digital up-converter unit is connected with the multichannel direct digital frequency synthesizer group through the downlink synchronous logic unit;
the uplink digital down converter unit is connected with the multichannel direct digital frequency synthesizer group through the uplink synchronous logic unit;
a multiplier group for combining the downlink sub-bands, comprising a plurality of multipliers, and connected to both the downlink digital up-converter unit and the multi-channel direct digital frequency synthesizer group;
the multiplier group for separating the uplink sub-band comprises a plurality of multipliers and is connected with the uplink digital down converter unit and the multichannel direct digital frequency synthesizer group;
and the accumulator is connected with the multiplier group of the downlink sub-band combiner.
In the above technical solution, the multichannel direct digital frequency synthesizer, the multiplier group for downlink subband combination, and the multiplier group for uplink subband separation all operate in parallel in multiple modules, and the number of channels of the multichannel direct digital frequency synthesizer group is the quotient of the total number of subbands and the number of parallel modules.
In connection with the above technical solution, the downlink digital up-converter unit increases the data rate of the low-rate serial data of the baseband through interpolation, and converts the data of all sub-bands into data arrangement corresponding to the multi-pass direct digital frequency synthesizer group through serial-to-parallel conversion.
In connection with the above technical solution, the narrowband multi-subband time division radio frequency remote unit further includes a reset module, which is connected to the multi-pass direct digital frequency synthesizer group, and the reset module configures the frequency control word of the multi-pass direct digital frequency synthesizer group by resetting.
The invention also provides a method for realizing sub-band separation and combination by the narrow-band multi-sub-band time division radio frequency remote unit, which comprises the following steps:
each channel in the multi-channel direct digital frequency synthesizer group generates a single tone signal corresponding to a plurality of sub-bands; and outputting corresponding zone bits to control the synchronization of the uplink digital down converter unit and the downlink digital up converter unit through the uplink synchronous logic unit and the downlink synchronous logic unit respectively;
the downlink digital up-converter unit interpolates the low-speed serial data of the baseband to the data rate required by combining a plurality of sub-bands, and simultaneously performs serial-parallel conversion on the data to ensure that the data are consistent with the data arrangement of the multi-channel direct digital frequency synthesizer group;
the uplink digital down converter unit extracts width signals of the multiple sub-bands of the combiner to meet the data rate required by the separation of the multiple sub-bands;
the multiplier group for combining the downlink sub-bands performs multiplication operation on the single-tone signals of the multi-channel direct digital frequency synthesizer group and the baseband signals corresponding to the downlink sub-bands, so that each sub-band is shifted to an appointed frequency point and then is aggregated by an accumulator;
the uplink digital down converter unit multiplies the single-tone signal of the multi-channel direct digital frequency synthesizer group and the width signals of a plurality of combined sub-bands, and each sub-band is shifted to zero frequency to realize sub-band separation.
According to the technical scheme, the uplink sub-band data and the downlink sub-band data are input in parallel by a plurality of sub-bands during sub-band separation and combination.
In connection with the above technical solution, the output flag bit of the multichannel direct digital frequency synthesizer group controls the input flag bit signal of the last stage decimation filter of the uplink digital down converter unit through the uplink synchronous logic unit to control the one-to-one correspondence between the sub-band of the multichannel direct digital frequency synthesizer group and the sub-band of the uplink data.
In connection with the above technical solution, the output flag bit of the multi-channel direct digital frequency synthesizer group controls the input flag bit signal of the last stage interpolation filter of the downlink digital up-converter unit through the downlink synchronization logic unit to control the sub-bands of the multi-channel direct digital frequency synthesizer group and the sub-bands of the downlink data to correspond one to one.
The invention has the following beneficial effects: the uplink digital down converter unit and the downlink digital up converter unit convert the uplink data rate and the downlink data rate to proper values according to the total effective bandwidth of the system and then carry out carrier separation and combination, so that logic resources can be fully utilized under the condition that the performance meets the requirement; the multi-channel direct digital frequency synthesizer group saves a large amount of hardware resources and logic resources by sharing the direct digital frequency synthesizer group with an uplink and a downlink.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a block diagram of a narrowband multi-subband time division radio remote unit scheme for implementing subband separation and combining according to an embodiment of the present invention.
Fig. 2 is a timing diagram of data and output flag bits of a multichannel direct digital frequency synthesizer according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of the arrangement of the sub-bands 440 after digital up/down conversion according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the multi-subband radio remote unit for implementing subband separation and combining according to the embodiment of the present invention includes a multi-channel direct digital frequency synthesizer group unit 1, a downlink synchronous logic unit 2, an uplink synchronous logic unit 3, a downlink digital up-converter unit 4, a multiplier group 5 for downlink subband combining, a multiplier group 6 for uplink subband separation, an uplink digital down-converter unit 7, and an accumulator 8.
The multichannel direct digital frequency synthesizer group 1 comprises a plurality of multichannel direct digital frequency synthesizers, is used for providing single tone signals required by moving subband frequency points and respectively synchronizes uplink data and downlink data through an output flag bit;
a downlink digital up-converter unit 4 connected to the multichannel direct digital frequency synthesizer group through the downlink synchronous logic unit;
an uplink digital down converter unit 7 connected to the multichannel direct digital frequency synthesizer group through the uplink synchronous logic unit;
a multiplier group 5 for downlink sub-band combination, which comprises a plurality of multipliers and is connected with the downlink digital up-converter unit 4 and the multi-channel direct digital frequency synthesizer group 1;
a multiplier group 6 for separating the uplink sub-band, which comprises a plurality of multipliers and is connected with the uplink digital down converter unit 7 and the multichannel direct digital frequency synthesizer group 1;
and the accumulator 8 is connected with the multiplier group 5 of the downlink sub-band combination.
In the present invention, the multichannel direct digital frequency synthesizer 1, the multiplier 5 for downlink subband combination, and the multiplier 6 for uplink subband separation all operate in parallel in multiple modules, and the number of channels in the multichannel direct digital frequency synthesizer 1 is the quotient of the total number of subbands (the number of uplink or downlink subbands) and the number of parallel modules (the number of uplink or downlink parallel modules).
Further, the downlink digital up-converter unit 4 increases the data rate of the baseband low-rate serial data by interpolation, and converts the data of all sub-bands into data arrangement corresponding to the multi-pass direct digital frequency synthesizer group 1 by serial-to-parallel conversion.
The narrowband multi-subband time division radio frequency remote unit further comprises a reset module (not shown in the figure) which is connected with the multi-pass direct digital frequency synthesizer group 1, and the reset module configures the frequency control words of the multi-pass direct digital frequency synthesizer group 1 through resetting.
The method for realizing sub-band separation and combination based on the narrow-band multi-sub-band time division radio frequency remote unit specifically comprises the following steps:
each channel in the multi-channel direct digital frequency synthesizer group 1 generates a single tone signal corresponding to each subband; and outputs corresponding zone bits to control the synchronization of the uplink digital down converter unit 7 and the downlink digital up converter unit 4 through the uplink synchronous logic unit 3 and the downlink synchronous logic unit 2 respectively;
the downlink digital up-converter unit 4 interpolates the baseband low-rate serial data to the data rate required by the combination of a plurality of sub-bands, and simultaneously performs serial-parallel conversion on the data to make the data consistent with the data arrangement of the multi-channel direct digital frequency synthesizer group 1;
the uplink digital down converter unit 7 extracts the width signals of the multiple sub-bands of the combiner to the data rate required by the separation of the multiple sub-bands;
the multiplier group 5 for downlink sub-band combination carries out multiplication operation on the single tone signal of the multi-channel direct digital frequency synthesizer group 1 and the baseband signal corresponding to the downlink sub-band, so that each sub-band is shifted to an appointed frequency point and then passes through an accumulator to realize the aggregation of the sub-band;
the uplink digital down converter unit 7 multiplies the single-tone signal of the multichannel direct digital frequency synthesizer group 1 and the width signals of the multiple sub-bands of the combiner, and shifts each sub-band to zero frequency to realize sub-band separation.
And the uplink and downlink sub-band data are input in parallel by a plurality of sub-bands when the sub-bands are separated and combined.
The output flag bit of the multichannel direct digital frequency synthesizer group 1 controls the input flag bit signal of the last stage of the decimation filter of the uplink digital down converter unit 7 through the uplink synchronous logic unit 3 to control the one-to-one correspondence of the sub-band of the multichannel direct digital frequency synthesizer group and the sub-band of the uplink data.
The output flag bit of the multichannel direct digital frequency synthesizer group 1 controls the input flag bit signal of the last stage interpolation filter of the downlink digital up-converter unit 4 through the downlink synchronous logic unit 2 to control the one-to-one correspondence of the sub-band of the multichannel direct digital frequency synthesizer group 1 and the sub-band of the downlink data.
As shown in fig. 2, the multichannel direct digital frequency synthesizer according to the embodiment of the present invention generates single tone signals corresponding to 16 subbands by taking 16 channels as an example. In this embodiment, the total number of subbands is 440, so 28 parallel multichannel direct digital frequency synthesizers are required. The frequency control word of the multi-channel direct digital frequency synthesizer group is input into the multi-channel direct digital frequency synthesizer group through an initialization file when the multi-channel direct digital frequency synthesizer group is reset.
According to the relationship between the system clock and the data rate, as shown in fig. 3, the downlink digital up-converter unit 4 or the uplink digital down-converter unit 7 converts the 440 subband signals into parallel data according to 28 subband groups, while the data takes 16 clock cycles as one processing cycle. The set 1 of multichannel direct digital frequency synthesizers is also a set of 28 direct digital frequency synthesizers, which allows a one-to-one correspondence between each subband of the baseband data and the single tone signal of the corresponding subband of the set 1 of multichannel direct digital frequency synthesizers, in preparation for further processing of the data.
The downlink digital up-converter unit 4 interpolates the serial data with low rate of baseband to the data rate required by the 440 sub-band combination, and simultaneously performs serial-to-parallel conversion on the data to make the data consistent with the data arrangement of the direct digital frequency synthesizer group 1, so that the rate and area (i.e. the amount of consumed logic resources) of logic implementation are more reasonable. The data arrangement is consistent, which means that the arrangement order of the subbands corresponds to the arrangement order of the tones generated by the direct digital frequency synthesizer group, i.e. subband 0 corresponds to tone No. 0 generated by the frequency synthesizer group, and a comparison between fig. 2 and fig. 3 can be seen.
The uplink digital down converter unit 7 extracts the width signals of the 440 sub-bands of the combiner to meet the data rate required by the 440 sub-band separation, so as to facilitate the subsequent data processing;
the multiplier comprises an upstream multiplier unit 6 and a downstream multiplier unit 5. The up digital down converter unit 7 and the down digital up converter unit 4 convert the data rate and data arrangement of the up and down data to be consistent with the data of the direct digital frequency synthesizer group 1 before the multiplication operation, and prepare for the multiplication operation.
The downlink multiplier unit 5 multiplies the single-tone signal of the multichannel direct digital frequency synthesizer group 1 and the baseband signal of the corresponding subband downlink, so that each subband is shifted to an appointed frequency point and then passes through the accumulator unit 8 to realize the aggregation of the subband. The uplink multiplier unit 6 multiplies the single-tone signal of the multichannel direct digital frequency synthesizer group 1 by the width signals of 440 subbands combined, and shifts each subband to zero frequency to realize subband separation.
The up-stream digital down converter unit 7 comprises several stages of data extraction filter units, and each stage of filter starts to work after the ready input signal is valid and outputs the extracted and filtered data. The invention uses the ready flag bit output by the multichannel direct digital frequency synthesizer 1 to control the ready input signal of the last stage of the extraction filter of the uplink digital down converter unit 7, so that the uplink digital down converter unit 7 and the multichannel direct digital frequency synthesizer unit 1 are synchronized, and the broadband signal of the uplink combiner and the output signal of the direct digital frequency synthesizer 1 can be multiplied to accurately carry the frequency of each sub-band to zero frequency to realize the separation of the sub-bands.
In order to make the subbands correspond to each other when the multiplication operation is performed on the downlink data and the output data of the multichannel direct digital frequency synthesizer group 1, and then correctly move each subband to a designated frequency point, the multichannel direct digital frequency synthesizer group 1 needs to be associated with the downlink digital up-converter unit 4.
In the invention, the downlink digital up-converter unit 4 comprises several stages of data interpolation filter units, and each stage of filter starts to work and outputs interpolated and filtered data after a ready input signal is effective. The specific way of associating the multichannel direct digital frequency synthesizer group 1 and the downlink digital up-converter unit 4 is as follows: when the last stage interpolation filter of the down digital up converter unit is reset, the ready input signal of the filter is enabled, after the filter passes two complete processing periods, the ready input of the filter is firstly placed in the signal invalidation state to enable the filter to be in a waiting state, after the filter waits for a certain time, the last signal of the multichannel direct digital frequency synthesizer group 1 is assigned to the ready signal of the filter and enables the ready of the filter to keep the state, so that the ready of the filter of the down digital up converter unit 4 is associated with the last signal of the direct digital frequency synthesizer group, because the next clock period of the ready of the filter of the down digital up converter unit 4 outputs the first data of one data period, and the next clock period of the last signal of the direct digital frequency synthesizer group also outputs the first data of the data period, so that the data of the down digital up converter unit 4 and the next clock period of the last signal of the multichannel direct digital frequency synthesizer group 1 output the first data of the data period, so that the data of the down digital up converter unit 4 and the last signal of The data can be synchronized. After the two groups of data aligned by the method enter the multiplier unit 5 for multiplication, each sub-band can be moved to a designated frequency point.
The invention relates the output flag bit of the multi-channel direct digital frequency synthesizer group with the input flag bit of the uplink digital down converter 7 and the input flag bit of the downlink digital up converter 4, so that the uplink and the downlink share the direct digital frequency synthesizer group. For the application of super-many sub-bands, the scheme shared by the multi-channel direct digital frequency synthesizer group can not only meet the requirement of sub-band separation, but also save a great deal of hardware resources and logic resources.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (8)
1. A narrow-band multi-sub-band time division radio remote unit for realizing sub-band separation and combination is characterized by comprising:
the multichannel direct digital frequency synthesizer group comprises a plurality of multichannel direct digital frequency synthesizers, is used for providing single tone signals required by moving subband frequency points and respectively synchronizes uplink data and downlink data through an output flag bit;
the downlink digital up-converter unit is connected with the multichannel direct digital frequency synthesizer group through the downlink synchronous logic unit;
the uplink digital down converter unit is connected with the multichannel direct digital frequency synthesizer group through the uplink synchronous logic unit;
a multiplier group for combining the downlink sub-bands, comprising a plurality of multipliers, and connected to both the downlink digital up-converter unit and the multi-channel direct digital frequency synthesizer group;
the multiplier group for separating the uplink sub-band comprises a plurality of multipliers and is connected with the uplink digital down converter unit and the multichannel direct digital frequency synthesizer group;
and the accumulator is connected with the multiplier group of the downlink sub-band combiner.
2. The narrowband multiband time-division radio-frequency remote unit (RRU) for realizing subband separation and combination according to claim 1, wherein the multichannel direct digital frequency synthesizer, the multiplier group for downlink subband combination and the multiplier group for uplink subband separation all work in parallel with multiple modules, and the number of channels of the multichannel direct digital frequency synthesizer group is a quotient of the total number of subbands and the number of parallel modules.
3. The narrow-band multi-subband time-division radio remote unit for performing subband splitting and combining as claimed in claim 1, wherein the downlink digital up-converter unit increases the data rate of the baseband low-rate serial data by interpolation, and converts the data of all subbands into the data arrangement corresponding to the multichannel direct digital frequency synthesizer group by serial-to-parallel conversion.
4. The narrowband multiband time-division radio-frequency remote unit (RRU) realizing subband separation and combination according to claim 1, further comprising a reset module connected to the multichannel direct digital frequency synthesizer set, wherein the reset module configures the frequency control word of the multichannel direct digital frequency synthesizer set by resetting.
5. A method for implementing sub-band separation and combination based on the narrow-band multi-sub-band time division radio remote unit of claim 1, comprising the steps of:
each channel in the multi-channel direct digital frequency synthesizer group generates a single tone signal corresponding to a plurality of sub-bands; and outputting corresponding zone bits to control the synchronization of the uplink digital down converter unit and the downlink digital up converter unit through the uplink synchronous logic unit and the downlink synchronous logic unit respectively;
the downlink digital up-converter unit interpolates the low-speed serial data of the baseband to the data rate required by combining a plurality of sub-bands, and simultaneously performs serial-parallel conversion on the data to ensure that the data are consistent with the data arrangement of the multi-channel direct digital frequency synthesizer group;
the uplink digital down converter unit extracts width signals of the multiple sub-bands of the combiner to meet the data rate required by the separation of the multiple sub-bands;
the multiplier group for combining the downlink sub-bands performs multiplication operation on the single-tone signals of the multi-channel direct digital frequency synthesizer group and the baseband signals corresponding to the downlink sub-bands, so that each sub-band is shifted to an appointed frequency point and then is aggregated by an accumulator;
the uplink digital down converter unit multiplies the single-tone signal of the multi-channel direct digital frequency synthesizer group and the width signals of a plurality of combined sub-bands, and each sub-band is shifted to zero frequency to realize sub-band separation.
6. The method for realizing sub-band separation and combination of the narrow-band multi-sub-band time division radio frequency remote unit as claimed in claim 5, wherein the data of the uplink sub-band and the downlink sub-band are inputted in parallel by a plurality of sub-bands during the sub-band separation and combination.
7. The method as claimed in claim 5, wherein the output flag bit of the multi-channel direct digital frequency synthesizer set controls the input flag bit signal of the last decimation filter of the up digital down converter unit through the up synchronization logic unit to control the sub-bands of the multi-channel direct digital frequency synthesizer set and the sub-bands of the up data to correspond to each other one by one.
8. The method of claim 5, wherein an output flag bit of the multi-channel direct digital synthesizer set controls an input flag bit signal of a last interpolation filter of the downlink digital up-converter unit through a downlink synchronization logic unit to control the sub-bands of the multi-channel direct digital synthesizer set and the sub-bands of the downlink data to correspond to each other one by one.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113949486A (en) * | 2021-09-23 | 2022-01-18 | 武汉正维电子技术有限公司 | ADS _ B signal analysis method and system based on symbol accumulation and correlation operation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113949486A (en) * | 2021-09-23 | 2022-01-18 | 武汉正维电子技术有限公司 | ADS _ B signal analysis method and system based on symbol accumulation and correlation operation |
| CN113949486B (en) * | 2021-09-23 | 2023-10-20 | 武汉正维电子技术有限公司 | ADS_B signal analysis method and system based on symbol accumulation and correlation operation |
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