CN107147427A - A kind of method of sampling of signal, device and system - Google Patents
A kind of method of sampling of signal, device and system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/7163—Spread spectrum techniques using impulse radio
- H04B1/71637—Receiver aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/7163—Spread spectrum techniques using impulse radio
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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Abstract
The invention discloses a kind of method of sampling of signal, device and system.This method includes：The multichannel useful signal of different frequency is filtered out in the signal to be sampled received, wherein the signal to be sampled is multiple frequency bands broadband signal；Using local oscillation signal corresponding with every road useful signal, the multichannel useful signal is moved into different Nyquists respectively interval；The interval multichannel useful signal of different Nyquists is merged into broadband signal all the way；The broadband signal obtained after merging is sampled.It is interval that multichannel useful signal in signal to be sampled is moved different Nyquists by the present invention, and then utilize frequency translation, multiple broadband signals are moved into different center frequency points, both the performance of frequency band signals can be ensured, compression bandwidth can be played a part of again, bandwidth availability ratio is improved, circuit cost is reduced.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a system for sampling a signal.
Background
The development of wireless communication requires more spectrum resources and larger signal bandwidth to carry broadband services. However, at present, due to limited spectrum resources, broadband signals are often required to be distributed over a plurality of discontinuous frequency bands, a traditional broadband multiband receiver is usually realized by using multiple channels, such a circuit structure is often complex, and the product is difficult to achieve low cost and miniaturization. The circuit structure of the multi-channel receiver is shown in fig. 1. Each channel of the multi-channel receiver independently processes a signal with one frequency, so that the multi-channel receiver has high selectivity, strong anti-interference capability and better receiving performance, but the circuit scale is large, and the miniaturization is not facilitated; the compatibility of various modes is poor; the circuit cost is high.
With the development of Analog-to-Digital (AD) sampling technology, a wideband ADC (Analog-to-Digital Converter) may also be used for single channel processing. The circuit structure of the single-channel receiver is shown in fig. 2. The single-channel receiver adopts one channel to process multi-band broadband signals, and the sampling clock frequency needs to be larger than twice of the bandwidth occupied by the start-stop frequency of the multi-band broadband signals.
By adopting a single-channel processing mode, the compatibility of multiple modes and multiple frequencies is good, and the development direction of the future ultra-wideband receiver is provided, however, the single-channel processing cost increases geometrically with the bandwidth increase, and the performance is in direct proportion to the AD sampling bandwidth. For example: the multi-band broadband signal comprises n (n > 1) broadband signals with discontinuous frequencies, and the center frequencies of the n broadband signals are respectively f1，f2，......，fnThe bandwidths of the n wideband signals are BW1 and BW2,.. times, bwn, and the start-stop frequency occupied bandwidth BW ═ f of the multiband wideband signaln+bwn/2)-(f1-bw1/2)＝(fn-f1+ (bwn + bw1)/2), then the sampling clock frequency Fs is required to satisfy Fs/2 > fn-f1+(bwn+bw1)/2。
Therefore, the existing sampling modes of the multiband broadband signals have the defects of high cost and low performance.
Disclosure of Invention
The invention provides a signal sampling method, a signal sampling device and a signal sampling system, which are used for solving the problems of high cost and low performance of the existing multi-band broadband signal sampling mode.
In view of the above technical problems, the present invention is achieved by the following technical solutions.
The invention provides a signal sampling method, which comprises the following steps: filtering out a plurality of paths of useful signals with different frequencies from the received signals to be sampled; the signal to be sampled is a multi-band broadband signal; respectively moving the multiple paths of useful signals to different Nyquist intervals by using local oscillation signals corresponding to the useful signals; combining multiple useful signals in different Nyquist intervals into a broadband signal; and sampling the broadband signals obtained after combination.
The method for filtering out multiple useful signals with different frequencies from a received signal to be sampled comprises the following steps: dividing the signal to be sampled into multiple paths; useful signals with different frequencies are filtered in the multipath signals to be sampled respectively.
The method for respectively moving the multiple useful signals to different Nyquist intervals by using the local oscillator signals corresponding to the useful signals comprises the following steps: and respectively moving the multiple paths of useful signals to different Nyquist intervals of the same broadband analog-to-digital converter by using the local oscillator signal corresponding to each path of useful signal.
After the plurality of useful signals are respectively moved to different nyquist intervals, before the plurality of useful signals in different nyquist intervals are combined into one broadband signal, the method further includes: and respectively carrying out anti-aliasing filtering processing on each path of useful signals.
Wherein, sampling the broadband signal obtained after the combination comprises: sampling the broadband signals obtained after combination by using a preset sampling clock frequency; wherein the sampling clock frequency is greater than twice the sum of the bandwidths of the plurality of useful signals.
The invention provides a signal sampling device, comprising: the filtering module is used for filtering out a plurality of paths of useful signals with different frequencies from the received signals to be sampled; the signal to be sampled is a multi-band broadband signal; the moving module is used for moving the multiple paths of useful signals to different Nyquist intervals by using local oscillation signals corresponding to the useful signals; the combining module is used for combining the multiple paths of useful signals in different Nyquist intervals into a path of broadband signal; and the sampling module is used for sampling the broadband signals obtained after combination.
Wherein the filtering module is configured to: dividing the signal to be sampled into multiple paths; useful signals with different frequencies are filtered in the multipath signals to be sampled respectively.
Wherein, the moving module is used for: and respectively moving the multiple paths of useful signals to different Nyquist intervals of the same broadband analog-to-digital converter by using the local oscillator signal corresponding to each path of useful signal.
Wherein the filter module is further configured to: after the multiple useful signals are respectively moved to different Nyquist intervals, before the multiple useful signals in different Nyquist intervals are combined into a broadband signal, anti-aliasing filtering processing is respectively carried out on each useful signal.
Wherein the sampling module is to: sampling the broadband signals obtained after combination by using a preset sampling clock frequency; wherein the sampling clock frequency is greater than twice the sum of the bandwidths of the plurality of useful signals.
The invention provides a signal sampling system, comprising: the device comprises a power divider, a frequency-selective filter bank, a mixer bank, an anti-aliasing filter bank, a combiner and a broadband digital-to-analog converter which are sequentially connected; the power divider is used for dividing the received signal to be sampled into multiple paths; the signal to be sampled is a multi-band broadband signal; the frequency-selective filter bank is used for filtering useful signals with different frequencies in a plurality of paths of signals to be sampled respectively; the frequency mixer group is used for respectively moving the multiple paths of useful signals to different Nyquist intervals of the broadband analog-to-digital converter by using local oscillation signals corresponding to the useful signals; the anti-aliasing filter bank is used for respectively carrying out anti-aliasing filtering processing on each path of useful signal; the combiner is used for combining multiple paths of useful signals in different Nyquist intervals into a path of broadband signal; and the broadband analog-to-digital converter is used for sampling the broadband signals obtained after combination.
Wherein the frequency selective filter bank comprises a plurality of frequency selective filters, the mixer bank comprises a plurality of mixers, and the anti-aliasing filter bank comprises a plurality of anti-aliasing filters; the power divider is respectively connected with the frequency-selecting filters; each frequency selection filter is correspondingly connected with one mixer; each mixer is correspondingly connected with an anti-aliasing filter; the plurality of anti-aliasing filters are respectively connected with the combiner; the power divider respectively inputs the power divided multi-channel signals to be sampled into each frequency selective filter; each frequency-selective filter is used for filtering a useful signal with a preset frequency in the input signal to be sampled and outputting the filtered useful signal to a corresponding mixer; each mixer is used for mixing the input useful signal with a preset local oscillation signal and outputting the mixed useful signal to a corresponding anti-aliasing filter; each anti-aliasing filter is used for carrying out anti-aliasing processing on the input useful signal and outputting the useful signal after the anti-aliasing processing to the combiner; the combiner is used for combining the useful signals respectively input by the anti-aliasing filters into a broadband signal.
The broadband analog-to-digital converter is used for sampling the broadband signals obtained after combination by using a preset sampling clock frequency; wherein the sampling clock frequency is greater than twice the sum of the bandwidths of the plurality of useful signals.
The invention has the following beneficial effects:
the invention moves the multi-path useful signals in the signals to be sampled to different Nyquist intervals, and then moves a plurality of broadband signals to different central frequency points by using frequency, thereby not only ensuring the performance of the frequency band signals, but also playing the role of compressing the bandwidth, improving the bandwidth utilization rate and reducing the circuit cost.
Drawings
FIG. 1 is a schematic diagram of a circuit configuration of a prior art multi-channel receiver;
fig. 2 is a schematic circuit diagram of a conventional single channel receiver;
FIG. 3 is a flow chart of a method of sampling a signal according to an embodiment of the invention;
FIG. 4 is a block diagram of a signal sampling apparatus according to an embodiment of the present invention;
FIG. 5 is a block diagram of a sampling system for a signal according to an embodiment of the present invention;
FIG. 6 is a detailed block diagram of a signal sampling system according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of frequency shifting according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of frequency shifting according to another embodiment of the present invention;
fig. 9 is a schematic structural diagram of a triple-band receiver according to an embodiment of the present invention;
fig. 10 is a schematic diagram of frequency shifting of a tri-band signal according to an embodiment of the invention.
Detailed Description
The invention shifts a plurality of discontinuous broadband signals through frequency spectrum, distributes the discontinuous broadband signals to different Nyquist zones of the same ADC, and samples a plurality of broadband signals sharing one ADC. The invention fully utilizes the ADC bandwidth, can achieve the performance of a single-frequency-band signal, simplifies the circuit structure and reduces the circuit cost; the sampling clock frequency of the ADC is more than twice of the sum of the bandwidths of the plurality of useful signals, so that the requirement on the sampling bandwidth of the ADC can be reduced, the utilization rate of the bandwidth of the ADC is improved, and the circuit cost is reduced.
The present invention will be described in further detail below with reference to the drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The invention provides a signal sampling method, and fig. 3 is a flow chart of the signal sampling method according to an embodiment of the invention.
In step S310, multiple useful signals with different frequencies are filtered out from the received signal to be sampled.
The signal to be sampled is a multiband broadband signal. The multi-band broadband signal is an analog signal, and comprises a plurality of paths of broadband signals with discontinuous frequencies. The multiple broadband signals are transmitted by one or more transmitting ends. The broadband signal is a signal of the type of a voice signal, an image signal, a data signal, etc. Each wideband signal is referred to as a desired signal.
The frequency range of each broadband signal (useful signal) is known; dividing the signal to be sampled into multiple paths; useful signals with different frequencies are filtered in the multipath signals to be sampled respectively. In other words, discontinuous broadband signals with multiple frequencies in the signal to be sampled are respectively filtered out, each broadband signal serves as one useful signal, and the frequency of each useful signal is different.
Step S320, using the local oscillator signal corresponding to each useful signal, respectively moving (distributing) the multiple useful signals to different nyquist intervals.
According to the frequency range of each path of useful signals in the signals to be sampled, corresponding local oscillation signals are set for each path of useful signals, the frequency of the local oscillation signals corresponding to each path of useful signals is different, each path of useful signals and the corresponding local oscillation signals are subjected to frequency mixing, the useful signals are moved to another frequency in the mode, and then the multiple paths of useful signals are distributed to different Nyquist intervals.
And step S330, combining the multiple useful signals in different Nyquist intervals into a broadband signal.
In order to fully utilize the bandwidth of the analog-to-digital converter and improve the performance of a single-frequency-band signal, the local oscillator signal corresponding to each path of useful signal can be utilized to respectively move the multiple paths of useful signals to different nyquist intervals of the same broadband analog-to-digital converter, and the multiple paths of useful signals in different nyquist intervals in the same broadband analog-to-digital converter are combined into one path of broadband signal.
Furthermore, the multiple useful signals moved to different nyquist intervals of the same wideband analog-to-digital converter can generate images in the first nyquist interval of the wideband analog-to-digital converter, and after the multiple useful signals are respectively moved to different nyquist intervals, before the multiple useful signals in different nyquist intervals are combined into one wideband signal, anti-aliasing filtering processing can be respectively carried out on each useful signal in order to suppress out-of-band spurious of each useful signal and prevent aliasing interference generated after the useful signals are moved to each nyquist area.
In the broadband analog-to-digital converter, because useful signals in other Nyquist intervals can generate images in the first Nyquist interval, the useful signals shifted to the first Nyquist interval and the images generated by the other useful signals in the first Nyquist interval can be combined into one broadband signal. The image of the useful signal can be regarded as the useful signal, and then the combined broadband signal comprises a plurality of useful signals without aliasing among the useful signals.
Step S340, sampling the wideband signal obtained after the combination.
Sampling the broadband signals obtained after combination by using a preset sampling clock frequency; because the broadband signal obtained by combining the multiple useful signals is in the first nyquist interval, the sampling clock frequency used by sampling is greater than twice of the sum of the bandwidths of the multiple useful signals.
For example: the bandwidths of the multiple useful signals are bw1, bw2,.. 9., bwn and n > 1, respectively, and then the sampling clock frequency Fs/2 > bw1+ bw2+... 9. + bwn.
The combined broadband signal is still an analog signal, and the analog signal is sampled and quantized into a digital signal so as to be subjected to digital signal processing subsequently.
The signal to be sampled comprises a plurality of paths of broadband signals (useful signals) with different frequencies, and the broadband signals with different frequencies in the signal to be sampled are shunted to circuits with different frequency bands for filtering. The invention utilizes frequency shift to shift a plurality of broadband signals to different central frequency points, can play a role of compressing bandwidth, avoids sampling bandwidth waste, saves resources, reduces circuit cost and simplifies circuit structure.
Based on the invention, more than two frequency band intervals can span a large broadband signal to share one ADC for sampling, and the sampling bandwidth of the ADC is smaller than the bandwidth of the signal to be sampled and the signal bandwidth interval. The gain brought by the method is that the requirement on the ADC sampling bandwidth is reduced, the utilization rate of the ADC bandwidth is improved, and the circuit cost is reduced.
The invention provides a signal sampling device. Fig. 4 is a block diagram of a signal sampling apparatus according to an embodiment of the present invention.
The device includes:
and a filtering module 410, configured to filter out multiple useful signals with different frequencies from the signal to be sampled. The signal to be sampled is a multi-band broadband signal.
And the moving module 420 is configured to move the multiple paths of useful signals to different nyquist intervals respectively by using the local oscillator signal corresponding to each path of useful signal.
And a combining module 430, configured to combine multiple useful signals in different nyquist intervals into one broadband signal.
And a sampling module 440, configured to sample the wideband signal obtained after the combining.
In one embodiment, the filtering module 410 is configured to divide the signal to be sampled into multiple paths; useful signals with different frequencies are filtered in the multipath signals to be sampled respectively.
In another embodiment, the moving module 420 is configured to move the multiple paths of useful signals to different nyquist intervals of the same wideband analog-to-digital converter respectively by using the local oscillator signal corresponding to each path of useful signal. And the merging module 430 is configured to merge the multiple useful signals in different nyquist intervals of the same wideband analog-to-digital converter into one wideband signal.
In another embodiment, the filtering module 410 is further configured to perform anti-aliasing filtering processing on each of the useful signals before combining the useful signals in different nyquist intervals into one broadband signal after moving the useful signals to different nyquist intervals, respectively.
In another embodiment, the sampling module 440 is configured to sample the combined wideband signal by using a preset sampling clock frequency; wherein the sampling clock frequency is greater than twice the sum of the bandwidths of the plurality of useful signals.
The functions of the apparatus in this embodiment have already been described in the method embodiment shown in fig. 3, so that reference may be made to the related descriptions in the foregoing embodiments for details which are not described in this embodiment.
The device described in this embodiment can be applied to a signal receiver, and the signal receiver can be arranged at a base station side, so that a signal to be sampled (analog signal) received by the signal receiver is sampled at the base station side, thereby avoiding the waste of sampling bandwidth and reducing the circuit cost.
The invention provides a signal sampling system. Fig. 5 is a block diagram of a sampling system for a signal according to an embodiment of the present invention.
The system comprises: a power divider 510, a frequency selective filter bank 520, a mixer bank 530, an anti-aliasing filter bank 540, a combiner 550 and a wideband analog-to-digital converter 560 connected in series.
The power divider 510 is configured to power divide the received signal to be sampled into multiple paths. The signal to be sampled is a multi-band broadband signal.
And a frequency-selective filter bank 520 for filtering the useful signals with different frequencies in the multiple paths of signals to be sampled respectively. Wherein, the frequencies of the useful signals of all paths are different. The band-select filter bank 520 may select the desired signal and reject out-of-band signals.
And the mixer group 530 is configured to shift the multiple paths of useful signals to different nyquist intervals of the wideband analog-to-digital converter, respectively, by using the local oscillator signal corresponding to each path of useful signal. The frequency of the local oscillation signal corresponding to each path of useful signal is different.
And the anti-aliasing filter bank 540 is used for performing anti-aliasing filtering processing on each path of useful signal respectively. The anti-aliasing filter bank 540 can suppress out-of-band spurs and avoid aliasing interference between useful signals placed in the nyquist intervals.
And a combiner 550, configured to combine multiple useful signals in different nyquist intervals into one broadband signal, so as to send the broadband signal to the same broadband analog-to-digital converter.
And a wideband analog-to-digital converter 560 for sampling the wideband signal obtained after the combination. Further, the broadband analog-to-digital converter is used for sampling the broadband signals obtained after combination by using a preset sampling clock frequency; wherein the sampling clock frequency is greater than twice the sum of the bandwidths of the plurality of useful signals.
The frequency selective filter bank 520 includes a plurality of frequency selective filters, the mixer bank 530 includes a plurality of mixers, and the anti-aliasing filter bank 540 includes a plurality of anti-aliasing filters. The number of frequency selective filters, the number of mixers and the number of anti-aliasing filters are equal.
The power divider 510 is connected to the plurality of frequency-selective filters, respectively; each frequency selection filter is correspondingly connected with one mixer; each mixer is correspondingly connected with an anti-aliasing filter; the plurality of anti-aliasing filters are respectively connected to the combiner 550.
Each frequency-selective filter is responsible for filtering a useful signal of one frequency; the frequencies of local oscillation signals input to each frequency mixer are different, and the frequency mixer is responsible for shifting the frequency of a useful signal with a certain frequency by using the local oscillation signals; each anti-aliasing filter is responsible for anti-aliasing processing for one frequency. The frequency selection filter, the mixer and the anti-aliasing filter are correspondingly connected according to the respective responsible frequencies.
According to the connection relationship, the power divider 510, the frequency-selective filter, the mixer, the anti-aliasing filter, the combiner 550 and the wideband analog-to-digital converter 560 perform the following processing on the signal to be sampled:
the power divider 510 respectively inputs the multiple paths of signals to be sampled which are divided by power to each frequency selective filter;
each frequency-selective filter is used for filtering a useful signal with a preset frequency in an input signal to be sampled and outputting the filtered useful signal to a corresponding mixer;
each mixer is used for mixing the input useful signal with a preset local oscillation signal and outputting the mixed useful signal to a corresponding anti-aliasing filter;
each anti-aliasing filter is configured to perform anti-aliasing processing on the input useful signal and output the anti-aliased useful signal to the combiner 550;
the combiner 550 is configured to combine the useful signals respectively input by the multiple anti-aliasing filters into a broadband signal, and input the broadband signal obtained after combination to the broadband analog-to-digital converter;
and a wideband analog-to-digital converter (ADC) for sampling the wideband signal input by the combiner 550.
For better explaining the present invention, the processing procedure of the signal of the present invention is explained with reference to the specific structural diagram of the sampling system of the signal shown in fig. 6.
The system comprises: a power divider 510, a frequency selective filter bank 520, a mixer bank 530, an anti-aliasing filter bank 540, a combiner 550, a wideband analog-to-digital converter 560 and a baseband processing unit 570 connected in sequence.
The frequency selective filter bank 520 includes: frequency selective filter FL1, frequency selective filter FL2, n > 1.
The mixer group 530 includes: mixer _1, Mixer _2, Mixer _ n.
The anti-aliasing filter bank 540 includes: anti-aliasing filter IL1, anti-aliasing filter IL 2.
The power divider 510 inputs a signal to be sampled, which includes n groups of wideband signals, and the center frequencies of the n groups of wideband signals are f respectively according to the sequence of the frequencies of the n groups of wideband signals from small to large1，f2......fn(unit: Hz); the bandwidths of the n groups of broadband signals are bw1, bw2.
The starting and stopping frequencies of the n groups of broadband signals are respectively as follows: (f)1-bw1/2)Hz～(f1+bw1/2)Hz，(f2-bw2/2)Hz～(f2+bw2/2)Hz，......，(fn-bwn/2)Hz～(fn+bwn/2)Hz；
The total bandwidth BW occupied by n groups of wideband signals is: BW ═ fn+bwn/2)-(f1-bw1/2)＝(fn-f1+(bwn+bw1)/2)。
The frequency selection filter FL1, the Mixer Mixer _1 and the anti-aliasing filter IL1 are connected, and the path is used for processing the center frequency f1Is wide bandNumber (n).
The frequency selection filter FL2, the Mixer Mixer _2 and the anti-aliasing filter IL2 are connected, and the path is used for processing the center frequency f2The broadband signal of (1).
By analogy, the frequency selective filter FLn, the Mixer _ n and the anti-aliasing filter ILn are connected, and the path is used for processing the center frequency fnThe broadband signal of (1).
The power divider 510 divides the signal to be sampled into n paths, and inputs the n paths of signal to the frequency selecting filter FL1, the frequency selecting filter FL2, and the frequency selecting filter FLn, respectively.
The frequency selecting filter FL1, the frequency selecting filter FL2, and the frequency selecting filter FLn perform frequency selecting filtering on the signal to be sampled respectively. For example: the frequency-selecting filter FL1 filters a center frequency f1The frequency-selective filter FL2 filters a broadband signal having a center frequency f2The frequency selective filter FLn filters a broadband signal with a center frequency fnThe broadband signal of (1).
The Mixer group 530 is used for frequency conversion, and the Mixer _1 uses the local oscillator signal Lo _1 to set the center frequency to f1The wideband signal of (2) is shifted to the 1 st Nyquist zone of the ADC560 to obtain the center frequency of f'1The broadband signal of (1); the Mixer _2 uses the local oscillator signal Lo _2 to set the center frequency to f2The wideband signal of (2) is shifted to the Nyquist zone of ADC560 to obtain the center frequency of f'2The broadband signal of (1); ...; the Mixer _ n uses the local oscillator signal Lo _ n to set the center frequency to fnThe wideband signal of (2) is shifted to the nth Nyquist section of the ADC560 to obtain the center frequency of f'nAnd then the broadband signals with different frequencies are distributed to different Nyquist intervals of the same ADC. Wherein, f'1＝f1-Lo_1，f′2＝f2-Lo_2，f′n＝fn-Lo_n。
The anti-aliasing filter IL1, the anti-aliasing filter IL2, and the anti-aliasing filter ILn are respectively aligned with the centerFrequency is f'1Broadband signal of (1), center frequency of f'2Is a wideband signal of f 'with a center frequency'nThe broadband signal is subjected to anti-aliasing filtering processing to eliminate out-of-band spurious. To facilitate anti-aliasing filter design, it is possible, but not limited to, to have each wideband signal individually in one Nyquist zone, and f'1In the first Nyquist zone, f'2Is located in a second nyquist zone.nIn the nth nyquist zone.
Combiner 550 sets center frequency to f'1Broadband signal of (1), center frequency of f'2Is a wideband signal of f 'with a center frequency'nThe broadband signals are combined into one path and sent to the ADC 560.
The ADC560 quantizes the combined wideband signal samples into a digital signal.
The baseband processing unit 570 performs digital signal processing on the digital signal.
FIG. 7 is a schematic diagram of frequency shifting according to an embodiment of the invention. As shown in fig. 7, the signal to be sampled includes two frequency broadband signals, i.e., carrier 1 and carrier 2, the carrier 1 is moved to nyquist 1 of the ADC560, and the carrier 2 is moved to nyquist 2 of the ADC 560. The mirror of carrier 2 is contained in the 1 st nyquist interval.
FIG. 8 is a schematic diagram of frequency shifting according to another embodiment of the present invention. As shown in fig. 8, the signal to be sampled includes n-frequency broadband signals, i.e., carrier 1, carrier 2, and carrier n, respectively, and carrier 1 is moved to the 1 st nyquist zone of ADC560, carrier 2 is moved to the 2 nd nyquist zone of ADC560, and carrier n is moved to the nth nyquist zone of ADC 560. The 1 st nyquist interval contains the mirror image of the carrier 2.
As can be known from fig. 7 and 8, the 1 st nyquist interval of the ADC560 may constitute a complete signal to be sampled, and then wideband signals of different nyquist intervals may be combined into one wideband signal. Thus, when sampling, only the sampling clock frequency Fs/2 > bw1+ bw2+. once. + bwn is needed to perform distortion-free sampling.
The existing Fs/2 > fn-f1+ (bwn + bw1)/2, the invention only needs Fs/2 > bw1+ bw2+. 9. + bwn, and fn-f1+ (bwn + bw1)/2 is much greater than bw1+ bw2+. + -. + bwn. Therefore, the embodiment of the invention can reduce the requirement on the sampling bandwidth of the ADC, and the advantage of the invention is more obvious when the frequency interval of the broadband signal is larger.
The invention can compress the bandwidth by using the frequency shifting and Nyquist sampling law, thereby avoiding the waste of the sampling bandwidth and saving the resources.
The invention uses the frequency mixer to move a plurality of broadband signals to different central frequency points, so that the broadband signals of a plurality of frequency points share one ADC, thereby achieving the purposes of reducing the circuit cost and simplifying the circuit structure.
The signal sampling system provided by the invention can be applied to a three-frequency receiver of a Time Division Duplex (TDD) Radio Remote Unit (RRU). The structure of the tri-band receiver is shown in fig. 9.
The TDD RRU is a 3G and 4G mixed-mode RRU, and three working frequency bands are respectively as follows:
1. the A frequency band has a bandwidth of 15M and a frequency range of 2010 MHz-2025 MHz, and is mainly used for transmitting TD-SCDMA single-mode signals;
2. the frequency band F is 30M in bandwidth, the frequency range is 1885 MHz-1915 MHz, and the transmitted signals are LTE signals and TD-SCDMA mixed-mode signals;
3. the E frequency range is 50M bandwidth, the frequency range is 2320 MHz-2370 MHz, and LTE single-mode signals are mainly transmitted.
After passing through a power divider of a tri-band receiver, a signal (to-be-sampled signal) containing F, A, E tri-bands is filtered out signals of F, A, E tri-bands by frequency-selecting filters FL1, FL2 and FL3 of different bands. Signals of the frequency band A pass through a Mixer Mixer _1, signals of the frequency band F pass through a Mixer Mixer _2, and signals of the frequency band E pass through a Mixer Mixer _ 3.
A. Signals in the F, E frequency band are frequency-converted in mixers Mixer _1, Mixer _2 and Mixer _3, respectively. Wherein:
the frequency of the local oscillation signal Lo _1 corresponding to the frequency band A signal is 2122MHz, the local oscillation signal is a high local oscillation signal, the frequency range of the intermediate frequency signal A' after the frequency band A signal conversion is 97 MHz-112 MHz, and the bandwidth is 15 MHz;
the frequency of the local oscillation signal Lo _2 corresponding to the F frequency band signal is 2122MHz, the local oscillation signal is a high local oscillation signal, the frequency range of the intermediate frequency signal F' after the F frequency band signal conversion is 207 MHz-237 MHz, and the bandwidth is 30 MHz;
the frequency of the local oscillation signal Lo _3 corresponding to the E-band signal is 2032MHz, which is a low local oscillation signal, the frequency range of the intermediate frequency signal E' after the E-band signal conversion is 288MHz to 338MHz, and the bandwidth is 50 MHz.
As shown in fig. 10, three intermediate frequency signals a, F, and E are sampled and then moved to different nyquist intervals, where the first nyquist interval includes an image of an E-band signal, an image of an F-band signal, and an a-band signal, and there is no aliasing in the frequency spectrum between the image of the E-band signal, the image of the F-band signal, and the a-band signal.
The sampling frequency of the ADC may be 245.76MHz (245.76 > 2 x (15+30+50)), so embodiments of the invention make full use of the bandwidth of the ADC.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, and the scope of the invention should not be limited to the embodiments described above.
Claims (13)
1. A method of sampling a signal, comprising:
filtering out a plurality of paths of useful signals with different frequencies from the received signals to be sampled; the signal to be sampled is a multi-band broadband signal;
respectively moving the multiple paths of useful signals to different Nyquist intervals by using local oscillation signals corresponding to the useful signals;
combining multiple useful signals in different Nyquist intervals into a broadband signal;
and sampling the broadband signals obtained after combination.
2. The method of claim 1, wherein filtering out multiple wanted signals of different frequencies in a received signal to be sampled comprises:
dividing the signal to be sampled into multiple paths;
useful signals with different frequencies are filtered in the multipath signals to be sampled respectively.
3. The method of claim 1, wherein moving the plurality of channels of useful signals to different nyquist intervals using a local oscillator signal corresponding to each channel of useful signals comprises:
and respectively moving the multiple paths of useful signals to different Nyquist intervals of the same broadband analog-to-digital converter by using the local oscillator signal corresponding to each path of useful signal.
4. The method of claim 1, wherein after moving the plurality of useful signals to different nyquist intervals, respectively, and before combining the plurality of useful signals of different nyquist intervals into one broadband signal, further comprising:
and respectively carrying out anti-aliasing filtering processing on each path of useful signals.
5. The method of any of claims 1-4, wherein sampling the combined wideband signal comprises:
sampling the broadband signals obtained after combination by using a preset sampling clock frequency;
wherein the sampling clock frequency is greater than twice the sum of the bandwidths of the plurality of useful signals.
6. An apparatus for sampling a signal, comprising:
the filtering module is used for filtering out a plurality of paths of useful signals with different frequencies from the received signals to be sampled; the signal to be sampled is a multi-band broadband signal;
the moving module is used for moving the multiple paths of useful signals to different Nyquist intervals by using local oscillation signals corresponding to the useful signals;
the combining module is used for combining the multiple paths of useful signals in different Nyquist intervals into a path of broadband signal;
and the sampling module is used for sampling the broadband signals obtained after combination.
7. The apparatus of claim 6, wherein the filtering module is to:
dividing the signal to be sampled into multiple paths;
useful signals with different frequencies are filtered in the multipath signals to be sampled respectively.
8. The apparatus of claim 6, wherein the moving module is to:
and respectively moving the multiple paths of useful signals to different Nyquist intervals of the same broadband analog-to-digital converter by using the local oscillator signal corresponding to each path of useful signal.
9. The apparatus of claim 6, wherein the filtering module is further to:
after the multiple useful signals are respectively moved to different Nyquist intervals, before the multiple useful signals in different Nyquist intervals are combined into a broadband signal, anti-aliasing filtering processing is respectively carried out on each useful signal.
10. The apparatus of any one of claims 6-9, wherein the sampling module is to:
sampling the broadband signals obtained after combination by using a preset sampling clock frequency;
wherein the sampling clock frequency is greater than twice the sum of the bandwidths of the plurality of useful signals.
11. A system for sampling a signal, comprising:
the device comprises a power divider, a frequency-selective filter bank, a mixer bank, an anti-aliasing filter bank, a combiner and a broadband digital-to-analog converter which are sequentially connected; wherein,
the power divider is used for dividing the received signal to be sampled into multiple paths; the signal to be sampled is a multi-band broadband signal;
the frequency-selective filter bank is used for filtering useful signals with different frequencies in a plurality of paths of signals to be sampled respectively;
the frequency mixer group is used for respectively moving the multiple paths of useful signals to different Nyquist intervals of the broadband analog-to-digital converter by using local oscillation signals corresponding to the useful signals;
the anti-aliasing filter bank is used for respectively carrying out anti-aliasing filtering processing on each path of useful signal;
the combiner is used for combining multiple paths of useful signals in different Nyquist intervals into a path of broadband signal;
and the broadband analog-to-digital converter is used for sampling the broadband signals obtained after combination.
12. The system of claim 11,
the frequency selective filter bank comprises a plurality of frequency selective filters, the mixer bank comprises a plurality of mixers, and the anti-aliasing filter bank comprises a plurality of anti-aliasing filters;
the power divider is respectively connected with the frequency-selecting filters; each frequency selection filter is correspondingly connected with one mixer; each mixer is correspondingly connected with an anti-aliasing filter; the plurality of anti-aliasing filters are respectively connected with the combiner;
the power divider respectively inputs the power divided multi-channel signals to be sampled into each frequency selective filter;
each frequency-selective filter is used for filtering a useful signal with a preset frequency in the input signal to be sampled and outputting the filtered useful signal to a corresponding mixer;
each mixer is used for mixing the input useful signal with a preset local oscillation signal and outputting the mixed useful signal to a corresponding anti-aliasing filter;
each anti-aliasing filter is used for carrying out anti-aliasing processing on the input useful signal and outputting the useful signal after the anti-aliasing processing to the combiner;
the combiner is used for combining the useful signals respectively input by the anti-aliasing filters into a broadband signal.
13. The system of claim 11 or 12,
the broadband analog-to-digital converter is used for sampling the broadband signals obtained after combination by using a preset sampling clock frequency;
wherein the sampling clock frequency is greater than twice the sum of the bandwidths of the plurality of useful signals.
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| CN201610117908.XA CN107147427A (en) | 2016-03-01 | 2016-03-01 | A kind of method of sampling of signal, device and system |
| PCT/CN2017/071395 WO2017148224A1 (en) | 2016-03-01 | 2017-01-17 | Signal sampling method, device and system |
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| CN115118292A (en) * | 2022-08-29 | 2022-09-27 | 成都动力比特科技有限公司 | Ultra-wideband receiver and radio frequency signal sampling method and device thereof |
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Application publication date: 20170908 |