CN106789782B - A kind of i/q baseband signal generator - Google Patents
A kind of i/q baseband signal generator Download PDFInfo
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- CN106789782B CN106789782B CN201710112258.4A CN201710112258A CN106789782B CN 106789782 B CN106789782 B CN 106789782B CN 201710112258 A CN201710112258 A CN 201710112258A CN 106789782 B CN106789782 B CN 106789782B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/14—Channel dividing arrangements, i.e. in which a single bit stream is divided between several baseband channels and reassembled at the receiver
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Abstract
This application discloses a kind of i/q baseband signal generators, the i/q baseband signal generator includes: constellation mapping block, channel model, resampling module and DAC, change sample rate using resampling module, it can support the symbol rate for continuously changing baseband signal, and highest symbol rate can be set to the half of DAC sample rate, therefore, it is very suitable to for generating wideband baseband signal, and the resampling module includes low-pass filter, low-pass filtering can be carried out to signal, signal after channel filtering can directly be risen into sampling, match data rate directly with DAC sample rate, intermediate treatment link is few, low-pass filter has flatness in very consistent band, the i/q baseband signal orthogonality of generation is relatively good.For the i/q baseband signal generator without using half-band filter in the prior art and cic filter, compensating filter etc., structure is simple, is conducive to software and hardware and realizes.
Description
Technical field
This application involves signal generator field more particularly to a kind of i/q baseband signal generators.
Background technique
Pass through digital modulation (planisphere mapping) in fields, the bit information flow such as software radio or communication, test measurement
The baseband signal with certain bandwidth is obtained afterwards, and baseband signal needs further progress channel filtering, is suitble to channel to pass to generate
Defeated signal carries out a certain proportion of liter of sampling processing again later, is then changed into analog signal by DAC.
Existing baseband signal generator realizes that process is general as shown in Figure 1, the bit information flow of input is reflected by planisphere
I, q two-way symbol data are obtained after penetrating, and the baseband signal with respective bandwidth are obtained after channel filtering, using half band of level-one
Filter or multi-level semi-band filter carry out a liter sampling, then propose the sample rate of i, q signal using CIC interpolation filter
It is raised to consistent with the sample rate of DAC, output signal obtains the orthogonal baseband signal of i, q two-way after DAC is converted.
In the prior art, the symbol data after planisphere mapping is after channel filtering due to taking half-band filter and CIC
A liter sample rate is realized in the combination of filter, the sample rate of integral multiple can only be supported to convert, to the symbol rate and DAC of baseband signal
Sample rate selection and calibration bring certain limitation, that is to say, that must between the symbol rate of baseband signal and the sample rate of DAC
Integral multiple relation must be met, so that the symbol rate of baseband signal can not be continuously configured；Moreover, because the prior art is adopted
It often also needs to increase behind cic filter since the passband gain of cic filter is there are inconsistency with cic filter
As soon as adding a compensating filter for compensating the passband unevenness of cic filter, this gives actual design to increase with realization
Complexity and workload.
Summary of the invention
The application provides a kind of i/q baseband signal generator, and optional sign rate can continuously be arranged, support any multiple
Rational sample rate conversion；It does not need to take half-band filter and cic filter, i, q two-way baseband signal of generation have
Good orthogonality.
A kind of i/q baseband signal generator provided by the present application, comprising:
Constellation mapping block, for receiving bit information flow, the bit information flow of input obtains i, q after planisphere maps
Two-way symbol flow data, the two-way symbol flow data are orthogonal each other；
Channel model is connected with the constellation mapping block output end, receives i, q two-way symbol flow data,
By presetting, frequency band selection and filtering, i, q two paths of signals are exported；
Resampling module is connected with the channel model output end, receives i, q two of the channel model output
Road signal carries out resampling to the two paths of signals respectively, and the sample rate of promotion signal makes its sample frequency by original sampling frequency
fs1Switch target sample frequency fs2；
DAC is connected with the resampling module output end, is f for receiving the frequency after resamplings2I, q two-way
Signal carries out digital-to-analogue conversion to it respectively, obtains i, q two-way baseband signal.
Further, the resampling module includes:
Relative position calculator obtains original sampling frequency and destination sample frequency, obtains original series；It is adopted according to original
Sample frequency and destination sample frequency, on the time dimension of original series calculate target sequence in each target sampling point relative to from it
The relative position information of nearest original sampling point；The original series are each original samples of the signal of the channel model output
The data sequence that point separately constitutes, the target sequence are that each target sampling point using destination sample frequency after resampling forms
Data sequence；
DDS phase accumulator, adds up by step value of frequency control word, and when relative position, computer operation is primary
When, phase accumulator accumulates once；
Number counter is overflowed, counts phase accumulator in the secondary cumulative process after DDS phase accumulator adds up every time
Total spilling number Q, Q (n)=Q (n-1)+M, M is spilling time numerical value when phase accumulator adds up every time；
Original sampling point selector, according to total spilling number Q, selected in original series continuous original sampling point as
Original sampling point is participated in, participates in original sampling point with original sampling point X (Q) as the original sampling point of starting；
Filter factor generator calculates the filtering system of each target sampling point according to the relative position information of each target sampling point
Number；
Low-pass filter exports target sampling point according to the filter factor after being filtered to selected original sampling point,
Obtain target sequence.
Further, the number of filter factor corresponding to each target sampling point that the filter factor generator calculates according to
The length of filter determines that the number of original sampling point required for each target sampling point is identical as the number of filter factor.
In some embodiments, when calculating each target sampling point, the original selected original sampling point of sampling point selector
Number it is identical as the number of filter factor that the filter factor generator is calculated.
In some embodiments, the frequency control word and original sampling frequency and target that the DDS phase accumulator uses
The ratio of sample frequency is directly proportional.
In some embodiments, the frequency control word that the DDS phase accumulator uses is
FTW=round (2N×fs1/fs2)
In formula, FTW indicates frequency control word；Round (s) indicates to carry out round to s；fs1For crude sampling frequency
Rate；fs2For destination sample frequency；N is phase accumulator digit.
In some embodiments, the relative position calculator calculates relative position information using following calculation formula:
In formula, index indicates relative position information, and mod (a, b) expression takes a to the modulus value of b；Round (s) indicate to s into
Row round；fs1For original sampling frequency；fs2For destination sample frequency；L is an integer, and meets L≤2N；
Acc is the phase value of phase accumulator, initial value zero；N is phase accumulator digit.
In some embodiments, the filter factor generator calculates the formula of filter factor are as follows:
Wherein, P is filter length.
In some embodiments, the formula that the low-pass filter is filtered are as follows:
In some embodiments, the constellation mapping block includes deserializer and constellation look-up table means, goes here and there and turns
Serial bit information flow is changed into parallel two-way bit information flow by parallel operation, then tables look-up to obtain two by constellation look-up table means 32
Corresponding i, q two-way symbol data of road bit information flow.
The beneficial effect of the application is: i/q baseband signal generator proposed by the present invention, is adopted using the change of resampling module
Sample rate can support the symbol rate for continuously changing baseband signal, and highest symbol rate can be set to the one of DAC sample rate
Half, therefore, it is very suitable to for generating wideband baseband signal, and the resampling module includes low-pass filter, it can be right
Signal carries out low-pass filtering, the signal after channel filtering can directly be risen sampling, make data rate and DAC sample rate directly into
Row matching, intermediate treatment link is few, which has flatness in very consistent band, the i/q baseband signal of generation
Orthogonality is relatively good, in addition, the i/q baseband signal generator is without using half-band filter and cic filter, compensating filter
Deng, structure is simple, be conducive to software and hardware realize.
Detailed description of the invention
Fig. 1 is that prior art baseband signal generator realizes Principle of Process figure；
Fig. 2 is a kind of i/q baseband signal generator structural block diagram provided by the present application；
Fig. 3 is a kind of planisphere mapping block structural block diagram provided by the present application；
Fig. 4 is a kind of resampling modular structure block diagram provided by the present application；
Fig. 5 is target sampling point acquisition process schematic diagram in resampling provided by the present application conversion.
Specific embodiment
The application is described in further detail below by specific embodiment combination attached drawing.
Referring to FIG. 2, this application provides a kind of i/q baseband signal generators, comprising: constellation mapping block 30, channel
Filter 20, resampling module 10 and DAC40.
Constellation mapping block 30 for receiving bit signal stream, the bit information flow of input obtained after planisphere maps i,
Q two-way symbol data, respectively by its first output end output symbol stream i, its second output terminal output symbol stream q, symbol stream i with
Symbol stream q is orthogonal each other.
Channel model 20, by presetting, frequency band selection and filtering, is had for receiving symbol stream i and symbol stream q
I, q two paths of signals x of respective bandwidthi(n) and xq(n)。
Resampling module 10 is used to be promoted the sample rate of i, q two paths of signals, and first input end receives signal xi(n),
Second input terminal receives signal xq(n), with signal xi(n) and xq(n) it is used as original signal, to signal xi(n) and xq(n) respectively into
Row resampling makes its sample frequency by original sampling frequency fs1Be converted to destination sample frequency fs2, so that output sampling frequency rate is
fs2I, q two paths of signals yi(n) and yq(n).Wherein, fs2>fs1, resampling module 10 realizes liter sampling to i, q two paths of signals.
In order to express easily, the data sequence of each original sampling point composition of original signal is known as being original series；It is defeated after resampling
The data sequence of each target sampling point composition of signal out is known as target sequence.
Due to the multiple that i/q sample rate is symbol rate, change the sample rate of i, q two paths of signals, is to change i, q two-way letter
Number symbol rate, wherein highest symbol rate can be set to the half of DAC40 sample rate.
It is f that DAC40, which receives resampling post-sampling frequency,s2I, q two paths of signals yi(n) and yq(n), digital-to-analogue is carried out to it to turn
It changes, obtains i, q two-way digital orthogonal baseband signal y of analog signal formi(t) and yq(t)。
Specifically, this application provides a kind of constellation mapping blocks 30, and with reference to Fig. 3, constellation mapping block 30 includes going here and there simultaneously
Converter 31 and constellation look-up table means 32, deserializer 31 will need the serial bit information modulated to be converted into parallel two
Road bit information flow, then table look-up to obtain corresponding i, q two-way symbol data of two-way bit information flow by constellation look-up table means 32.
For example, 4 powers of 16QAM corresponding 2, are exactly every mono- group of 4 bit, then pass through the look-up table in the 16QAM coordinate pre-established
In table look-up, directly obtain the road the i symbol data and the road q symbol data of this corresponding constellation point of 4 bit information.
Specifically, this application provides a kind of resampling modules 10, and with reference to Fig. 4, resampling module 10 includes: relative position
Calculator 12, overflows number counter 13, original sampling point selector 14,15 and of filter factor generator at DDS phase accumulator 11
Low-pass filter 16.
Relative position calculator 12 obtains original sampling frequency fs1With destination sample frequency fs2, according to original sampling frequency
fs1With destination sample frequency fs2, on the time dimension of original series calculate target sequence in each target sampling point relative to from it
Therefore the relative position information of nearest original sampling point obtains a target sampling point and needs to calculate a relative position information.
In some embodiments, original series are indicated with x (n), indicates that target sequence, index indicate opposite position with y (n)
Confidence breath calculates relative position information using following formula:
In formula, mod (a, b) expression takes a to the modulus value of b；Round (s) indicates to carry out round to s；fs1For original
Beginning sample frequency；fs2For destination sample frequency；L is an integer, and meets L≤2N；Acc is DDS phase accumulator 11
Phase value, initial value zero；N is phase accumulator digit.
DDS phase accumulator 11 adds up using frequency control word FTW as step value, the every needs of relative position calculator 12
When calculating a relative position information index (n), DDS phase accumulator 11 is accumulated once.Specifically, the phase of phase accumulator
The calculation formula of place value Acc is as follows:
Acc (n)=mod (Acc (n-1)+FTW, 2N) (1-2)
In formula, mod (a, b) expression takes a to the modulus value of b；FTW=round (2N×fs1/fs2)；N is phase accumulator position
Number.
Number counter 13 is overflowed when DDS phase accumulator 11 has often added up one time, counts phase in the secondary cumulative process
Total spilling number Q of bit accumulator, for adjusting the original sampling point of starting for participating in original sampling point, moreover, X (Q) also illustrates that calculating
Each target sampling point is relative to nearest original sampling point in target sequence, wherein Q (n)=Q (n-1)+M, M are tired for DDS phase
Spilling time numerical value when adding device 11 cumulative every time.
Original sampling point selector 14 obtains original series x (n), and overflows number Q according to total, the company of selection in original series
Continuous original sampling point is as the original sampling point of participation, wherein participates in original sampling point with original sampling point X (Q) as the original sampling point of starting.Institute
The number of the original sampling point of selection is identical as the filter factor number that filter factor generator 15 is calculated, and filter factor
Number is determined according to the length of filter.In some embodiments, the number of filter factor is identical as the length P of filter, because
This original sampling point of participation chosen is represented by { x (Q), x (Q+1) ..., x (Q+P-1) }.
Filter factor generator 15 calculates the filtering system of each target sampling point according to the relative position information of each target sampling point
Number is to generate in real time by the filter factor that filter factor generator 15 is calculated, and the adaptability of filter factor is strong, adopts again
The real-time of sample is preferable, can support the rational resampling of any multiple.Specifically, it needs to use when calculating some target sampling point
Filter coefficient it is as follows:
Wherein, P is filter length, and according to specific hardware environment when realizing, P value can be chosen between 8~32
Value, L≤2N, N is phase accumulator digit, and the range of the value of index is 0~(L-1).
Low-pass filter 16 is filtered selected original sampling point according to the filter factor h (index, k), and
Each target sampling point is exported, target sequence is obtained, output sampling frequency rate is fs2I, q two paths of signals yi(n) and yq(n), it realizes
Rise sample rate conversion.Because low-pass filter 16 is to i, q two paths of signals yi(n) and yq(n) low-pass filtering has been carried out, can will have been believed
The signal that channel filter 20 exports directly rises sampling, matches data rate directly with DAC40 sample rate, intermediate treatment ring
Section is few, and low-pass filter 16 has flatness in very consistent band, and the i/q baseband signal orthogonality of generation is relatively good.Specifically
Ground is mostly used the formula of filtering are as follows:
It is described in detail below and how to obtain each target sampling point.
With reference to Fig. 5, for target sampling point acquisition process schematic diagram in resampling provided by the present application conversion, in figure, black is real
Heart dot indicates each original sampling point of original series x (n), sampling period T1=1/fs1, the phase of two neighboring original sampling point
Potential difference is 2 π, and the interpolated point number between two neighboring original sampling point is 2N,；Solid five-pointed star indicates each of target sequence y (n)
Target sampling point, sampling period T2=1/fs2.In DDS 11 cycle accumulor of phase accumulator, formula (1-1) meter is reused
Calculate the corresponding relative position information of each target sampling point.
Assuming that P=8, needs 8 original sampling points of participation of selection in original sampling point x (n), because of original sampling point in Fig. 5
Initial point is x (1), selects QInitially=Q (1)=1.So,
When calculating (1) y, index (1)=0, Q (1)=1；
When calculating (2) y, DDS phase accumulator 11 does not overflow from A point to B point, the original sampling point nearest from y (2)
For x (1), index (2)=FTW, Q (2)=Q (1)+0=1；
When calculating (3) y, DDS phase accumulator 11 does not overflow from B point to C point, the original sampling point nearest from y (3)
For x (1), index (3)=2FTW, M=0, Q (3)=Q (2)+0=1；
When calculating (4) y, DDS phase accumulator 11 has overflowed once from C point to D point, original is spanned on time dimension
Beginning sampling point x (2), the original sampling point nearest from y (4) are become x (2) from x (1), index (4)=3FTW-2N, when this time cumulative
Overflow time numerical value M=1, Q (4)=Q (3)+1=2；
And so on, the corresponding relative position information of target complete sampling point and Q value can be calculated separately out, later, according to public affairs
Formula (1-3) calculates the corresponding filter factor of each target sampling point in real time, is that starting point selects the corresponding P original of each target sampling point with X (Q)
Beginning sampling point recycles formula (1-4) to participate in original sampling point progress low-pass filtering to each, obtains whole mesh as original sampling point is participated in
Standard specimen point, obtains target sequence, so that obtaining sample rate is fs2Signal yi(n)、yq(n)。
It can be seen that resampling module 10 is according to original sampling frequency and destination sample frequency, dexterously in original series
Time dimension on calculate relative position information of each target sampling point relative to nearest original sampling point, according to this with respect to position
Confidence breath directly calculates required filter factor when obtaining each target sampling point in real time, and when according to calculating relative position information
Total spilling number of statistics participates in original sampling point required for selecting from original series, then according to the filter factor to choosing
The original sampling point of the participation selected is filtered, and achievees the purpose that resampling, and such resampling is high-efficient, real-time is preferable, can be propped up
The rational resampling of any multiple is held, can continuously obtain the baseband signal of different target sample frequency as needed.
In conclusion due to the application using resampling module 10 instead of existing half-band filter and cic filter into
Row resampling can support the symbol rate for continuously changing baseband signal, and highest symbol rate can be set to DAC40 sample rate
Half be therefore very suitable to for generating wideband baseband signal；And without using half-band filter and cic filter, benefit
Filter etc. is repaid, structure is simple, is conducive to software and hardware and realizes；And since resampling module 10 includes low-pass filter 16, can incite somebody to action
Signal after channel filtering directly rises sampling, matches data rate directly with DAC40 sample rate, intermediate treatment link
Few, the i/q baseband signal orthogonality of generation is relatively good.
The foregoing is a further detailed description of the present application in conjunction with specific implementation manners, and it cannot be said that this Shen
Specific implementation please is only limited to these instructions.For those of ordinary skill in the art to which this application belongs, it is not taking off
Under the premise of from the present application design, a number of simple deductions or replacements can also be made.
Claims (9)
1. a kind of i/q baseband signal generator characterized by comprising
Constellation mapping block, for receiving bit information flow, the bit information flow of input obtains i, q two-way after planisphere maps
Symbol flow data, the two-way symbol flow data are orthogonal each other；
Channel model is connected with the constellation mapping block output end, receives i, q two-way symbol flow data, passes through
Presetting, frequency band selection and filtering export i, q two paths of signals；
Resampling module is connected with the channel model output end, receives i, q two-way letter of the channel model output
Number, resampling is carried out respectively to the two paths of signals, the sample rate of promotion signal converts its sample frequency by original sampling frequency
For destination sample frequency；
DAC is connected with the resampling module output end, is f for receiving the sample frequency after resamplings2I, q two-way
Signal carries out digital-to-analogue conversion to it respectively, obtains i, q two-way baseband signal；
Wherein, the resampling module includes:
Relative position calculator obtains original sampling frequency and destination sample frequency, obtains original series, according to crude sampling frequency
Rate and destination sample frequency, on the time dimension of original series calculate target sequence in each target sampling point relative to nearest
Original sampling point relative position information；The original series are each original sampling points point of the signal of the channel model output
The data sequence not formed, the target sequence are the numbers that each target sampling point using destination sample frequency after resampling forms
According to sequence；
DDS phase accumulator, adds up by step value of frequency control word, when relative position computer operation one time, phase
Bit accumulator accumulates once；
Number counter is overflowed, counts the total of phase accumulator in the secondary cumulative process after DDS phase accumulator adds up every time
Number Q is overflowed, Q (n)=Q (n-1)+M, M are spilling time numerical value when phase accumulator adds up every time；
Original sampling point selector selects continuous original sampling point as participation according to total spilling number Q in original series
Original sampling point participates in original sampling point with original sampling point X (Q) as the original sampling point of starting；
Filter factor generator calculates the filter factor of each target sampling point according to the relative position information of each target sampling point；
Low-pass filter exports target sampling point, obtains according to the filter factor after being filtered to selected original sampling point
Target sequence.
2. i/q baseband signal generator as described in claim 1, which is characterized in that the filter factor generator calculated
The number of filter factor corresponding to each target sampling point is determining according to the length of filter, original required for each target sampling point
The number of beginning sampling point and the number of filter factor are identical.
3. i/q baseband signal generator as claimed in claim 2, which is characterized in that when calculating each target sampling point, the original
For the filter factor that the number of the selected original sampling point of beginning sampling point selector and the filter factor generator are calculated
Number is identical.
4. i/q baseband signal generator as described in claim 1, which is characterized in that the frequency that the DDS phase accumulator uses
Rate control word is directly proportional to the ratio of original sampling frequency and destination sample frequency.
5. i/q baseband signal generator as claimed in claim 4, which is characterized in that the frequency that the DDS phase accumulator uses
Rate control word is
FTW=round (2N×fs1/fs2)
In formula, FTW indicates frequency control word；Round (s) indicates to carry out round to s；fs1For original sampling frequency；
fs2For destination sample frequency；N is phase accumulator digit.
6. i/q baseband signal generator as described in claim 1, which is characterized in that the relative position calculator use with
Lower calculation formula calculates relative position information:
In formula, index indicates relative position information, and mod (a, b) expression takes a to the modulus value of b；Round (s) indicates to carry out four to s
House five enters to be rounded；fs1For original sampling frequency；fs2For destination sample frequency；L is an integer, and meets L≤2N；Acc is
The phase value of phase accumulator, initial value zero；N is phase accumulator digit.
7. such as i/q baseband signal generator as claimed in any one of claims 1 to 6, which is characterized in that the filter factor generates
The formula of device calculating filter factor are as follows:
Wherein, P is filter length.
8. i/q baseband signal generator as claimed in claim 7, which is characterized in that the low-pass filter was filtered
Formula are as follows:
9. i/q baseband signal generator as described in claim 1, which is characterized in that the constellation mapping block includes going here and there simultaneously
Serial bit information flow is changed into parallel two-way bit information flow by converter and constellation look-up table means, deserializer, then
It is tabled look-up to obtain corresponding i, q two-way symbol data of two-way bit information flow by constellation look-up table means.
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| CN105450310A (en) * | 2015-11-16 | 2016-03-30 | 中国电子科技集团公司第十研究所 | GMSK signal generator with variable symbol rate |
| CN106160755A (en) * | 2016-09-29 | 2016-11-23 | 上海航天测控通信研究所 | Ka waveband radio frequency modulating system and method |
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