CN111082828B - Self-adaptive frequency conversion and frequency shift method and system - Google Patents
Self-adaptive frequency conversion and frequency shift method and system Download PDFInfo
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- CN111082828B CN111082828B CN201911311361.7A CN201911311361A CN111082828B CN 111082828 B CN111082828 B CN 111082828B CN 201911311361 A CN201911311361 A CN 201911311361A CN 111082828 B CN111082828 B CN 111082828B
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Abstract
A self-adaptive frequency conversion and frequency shift method and a system thereof carry out parameter configuration according to the needs of operators and research and development needs, judge the local oscillation type according to the parameters, and correspondingly calculate the down-conversion local oscillation frequency and the frequency shift frequency so as to correspondingly synthesize the down-conversion local oscillation signal and the frequency shift signal, thereby realizing the multiple selectable and controllable down-conversion operations and the multiple selectable and controllable frequency spectrum shift operations corresponding to the down-conversion local oscillation frequency and the frequency shift frequency. In the research and development process, a set of new variable frequency shift schemes can be obtained only by changing the first group of parameters and the second group of parameters, the configured parameters are different, the variable frequency shift schemes are different, and self-adaptive variable frequency shift is realized; through a simple parameter configuration test, an optimal frequency conversion and frequency shift scheme can be obtained, interference signals are effectively avoided, communication quality is improved, hardware and software of the repeater are not required to be repeatedly designed and changed, the research and development period is greatly shortened, the research and development cost is reduced, and flexibility is high.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a self-adaptive frequency conversion and frequency shift method and a self-adaptive frequency conversion and frequency shift system.
Background
In the process of wireless communication, the repeater is utilized to ensure the large-scale network coverage on the premise of not increasing the number of base stations. The repeater processes the communication input signal as shown in figure 1. In the development process, under the condition that the system bandwidth, the network system of the operator and the subband configuration of the broadband supported by the repeater are the same, the designs of steps S101, S103, S104, S105, S107, S109, S110 and S112 in fig. 1 are relatively fixed, and need to be changed less; in steps S102, S106, S108 and S111, different design schemes need to be applied because of different local oscillation types and different intermediate frequency points. The frequency conversion technology adopted by the repeater station, the base station and other equipment is realized based on the principle of a superheterodyne receiver. Constrained by the superheterodyne receiver principle, some interferences including image spectrum interference, combined frequency interference, intermediate frequency interference and the like are inevitably generated in the signal transmission and processing processes. In the development process, it is difficult to fully predict what kind of influence these interferences will have on the system, and once these interference signals appear, the communication quality of the device is not up to the requirement, and it is very difficult to find out the cause of the interference.
At present, the traditional solution is to change the frequency spectrum design scheme of the device, so that the communication input signal avoids these interferences, and then filter the interference signal with the aid of the filtering technology, so as to obtain a low-noise and high-quality communication input signal. However, when the spectrum design scheme is changed, the frequency conversion and shift scheme of the repeater also needs to be changed adaptively, which results in that the hardware and software of the repeater need to be designed and changed repeatedly in the process of research and development, so that the research and development activities are very passive, and the research and development cycle is too long.
Disclosure of Invention
In view of this, embodiments of the present invention provide a self-adaptive frequency conversion and shift method and system, which aim to solve the problem that in the development process of the conventional technical scheme, the frequency conversion scheme of a repeater needs to be adaptively changed when the frequency spectrum design scheme is changed, so that hardware and software of the repeater need to be repeatedly designed and changed for many times, and the development cycle is too long.
A first aspect of an embodiment of the present invention provides an adaptive frequency conversion and frequency shift method, configured to perform frequency conversion and frequency shift processing on a communication input signal, where the adaptive frequency conversion and frequency shift method includes:
configuring a first group of parameters, wherein the first group of parameters comprise the center frequency and the down-conversion local oscillation frequency of the communication input signal; the communication input signal comprises at least one set of sub-band communication signals;
judging local oscillation types according to the first group of parameters, wherein the local oscillation types comprise a low local oscillation and a high local oscillation;
receiving a down-conversion local oscillator signal with a down-conversion local oscillator frequency;
mixing the frequency conversion local oscillation signal with a communication input signal to obtain a down-conversion signal, wherein the down-conversion signal comprises at least one group of sub-band intermediate frequency signals;
configuring a second group of parameters, wherein the second group of parameters comprises the minimum frequency and the maximum frequency of each group of subband communication signals and the minimum frequency and the maximum frequency of the communication input signals;
determining the frequency shift frequency of the sub-band intermediate frequency signal according to the local oscillation type, the first group of parameters and the second group of parameters;
generating a frequency shifted signal having a frequency shifted frequency;
and mixing the frequency shift signal with the sub-band intermediate frequency signal, and moving the central frequency point of the sub-band intermediate frequency signal to zero frequency so as to realize self-adaptive frequency shift.
In this embodiment, by repeatedly configuring the first group of parameters and the second group of parameters, corresponding down-conversion local oscillation signals and frequency shift signals are adaptively synthesized, so that the communication input signals have various selectable and controllable down-conversion modes, and the multiple groups of sub-band intermediate frequency signals corresponding to the communication input signals have various selectable and controllable frequency spectrum shifting modes. Through a simple parameter configuration test, a complete set of frequency conversion and frequency shift scheme of the repeater can be developed according to actual conditions and actual needs in a short time, and cost and time are saved.
A second aspect of the embodiments of the present invention provides an adaptive frequency conversion and shift system, configured to perform frequency conversion and shift processing on a communication input signal, where the adaptive frequency conversion and shift system includes:
a parameter configuration module, configured to configure a first set of parameters and a second set of parameters, where the first set of parameters includes a center frequency and a down-conversion local oscillation frequency of the communication input signal; the second set of parameters includes a minimum frequency and a maximum frequency of each set of subband communication signals, and a minimum frequency and a maximum frequency of a communication input signal;
the control module is used for judging the first group of parameters to judge the local oscillation type, wherein the local oscillation type comprises a low local oscillation and a high local oscillation, and determining the frequency shift frequency of the sub-band intermediate frequency signal according to the local oscillation type, the first group of parameters and the second group of parameters;
a synthesizing module, configured to synthesize a down-conversion local oscillator signal having the down-conversion local oscillator frequency, and synthesize a frequency-shifted signal having the frequency-shifted frequency;
and the frequency mixing module is used for mixing the frequency conversion local oscillator signal with the communication input signal to obtain a down-conversion signal, mixing the frequency shift signal with the sub-band intermediate frequency signal, and shifting the central frequency point of the sub-band intermediate frequency signal to zero frequency to realize self-adaptive frequency shift.
The self-adaptive frequency conversion and frequency shift method and the system provided by the invention configure parameters according to the needs of operators and research and development requirements, judge the local oscillation type according to the parameters, correspondingly calculate the down-conversion local oscillation frequency and the frequency shift frequency, and correspondingly synthesize the down-conversion local oscillation signal and the frequency shift signal, thereby realizing various selectable and controllable down-conversion operations and various selectable and controllable frequency spectrum shift operations corresponding to the down-conversion local oscillation frequency and the frequency shift frequency. In the research and development process, a set of new variable frequency shift schemes can be obtained only by changing the first group of parameters and the second group of parameters, the configured parameters are different, the variable frequency shift schemes are different, and self-adaptive variable frequency shift is realized; through a simple parameter configuration test, an optimal frequency conversion and frequency shift scheme can be obtained, interference signals are effectively avoided, communication quality is improved, hardware and software of the repeater are not required to be repeatedly designed and changed, the research and development period is greatly shortened, the research and development cost is reduced, and flexibility is high.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flow chart of a repeater processing a communication input signal;
fig. 2 is a flowchart illustrating an adaptive frequency conversion and shift method according to an embodiment of the present invention;
FIG. 3 is a block flow diagram of the adaptive frequency conversion and shift method shown in FIG. 2 applied to the process flow diagram shown in FIG. 1;
fig. 4 is a flowchart illustrating an adaptive frequency conversion and shift method according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of an adaptive frequency conversion and shift system according to still another 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.
The invention provides a self-adaptive frequency conversion and frequency shift method and a system, which are mainly applied to the research and development process of a repeater, and aims to solve the problem existing in the research and development work of the repeater at present, namely the frequency spectrum design scheme of a client (such as an operator) is influenced by interference signals which are difficult to find out causes and eliminate in the actual working process and needs to be changed, so that the frequency conversion and frequency shift scheme of the repeater which is customized for the frequency spectrum design scheme in the prior art is not suitable any more, needs to be researched and developed again, hardware and software of the repeater are repeatedly designed and changed for many times, the research and development process is time-consuming and cost-consuming, and research and development activities are very passive.
The self-adaptive frequency conversion frequency shift method provided by the invention carries out parameter configuration according to the requirements of operators and research and development requirements, judges the local oscillation type according to the parameters, and correspondingly calculates the down-conversion local oscillation frequency FhAnd a frequency shift frequency FshAnd correspondingly synthesizing the down-conversion local oscillation signal and the frequency shift signal to realize the various selectable and controllable down-conversion operations and the various selectable and controllable frequency spectrum shifting operations corresponding to the down-conversion local oscillation signal and the frequency shift signal on the communication input signal.
In the research and development process, a set of new variable frequency shift schemes can be obtained only by changing the first group of parameters and the second group of parameters, the configured parameters are different, the variable frequency shift schemes are different, and self-adaptive variable frequency shift is realized; through a simple parameter configuration test, an optimal frequency conversion and frequency shift scheme can be obtained, interference signals are effectively avoided, the communication quality of equipment is improved, hardware and software of the repeater are not required to be repeatedly designed and changed for many times, the research and development period is greatly shortened, the research and development cost is reduced, and the flexibility is high.
Referring to fig. 2 and fig. 3, fig. 2 is a detailed flowchart of an adaptive frequency conversion and shift method according to an embodiment of the present invention, and fig. 3 is a flowchart of the adaptive frequency conversion and shift method shown in fig. 2 applied to the processing flowchart shown in fig. 1; for convenience of explanation, only the parts related to the present embodiment are shown, and detailed as follows:
an adaptive frequency conversion and shift method is used for carrying out frequency conversion and shift processing on a communication input signal. The self-adaptive frequency conversion and shift method comprises the following steps:
s201: configuring a first group of parameters, wherein the first group of parameters comprise the center frequency and the down-conversion local oscillation frequency of the communication input signal; the communication input signal comprises at least one set of sub-band communication signals.
S202: and judging the local oscillation type according to the first group of parameters, wherein the local oscillation type comprises a low local oscillation and a high local oscillation.
S203: a downconverted local oscillator signal having a downconverted local oscillator frequency is received.
S204: and mixing the frequency conversion local oscillation signal with the communication input signal to obtain a down-conversion signal, wherein the down-conversion signal comprises at least one group of sub-band intermediate frequency signals.
S205: and configuring a second group of parameters, wherein the second group of parameters comprises the minimum frequency and the maximum frequency of each group of subband communication signals and the minimum frequency and the maximum frequency of the communication input signals.
S206: and determining the frequency shift frequency of the sub-band intermediate frequency signal according to the local oscillation type, the first group of parameters and the second group of parameters.
S207: a frequency shifted signal having a frequency shifted frequency is generated.
S208: and mixing the frequency shift signal with the sub-band intermediate frequency signal, and moving the central frequency point of the sub-band intermediate frequency signal to zero frequency so as to realize self-adaptive frequency shift.
Specifically, as will be known to those skilled in the art, an operator converts a communication input signal from a time domain to a frequency domain by using a sub-band coding technique, then divides the communication input signal into a plurality of sub-bands, and digitally codes the sub-bands, wherein all the sub-bands are collectively referred to as sub-band intermediate frequency signals in this application.
Those skilled in the art will appreciate that the communication input signal may be of a single format or may be of multiple formats. When the communication input signals of multiple standards are continuous frequency spectrums, the communication input signals are a group of sub-band communication signals, so that the minimum frequency of the sub-band communication signals is the minimum frequency of the communication input signals, and the maximum frequency of the sub-band communication signals is the maximum frequency of the communication input signals. When the frequency spectrums of the communication input signals of various systems are discontinuous, the communication input signals comprise a plurality of groups of sub-band communication signals, each group of sub-band communication signals have minimum frequency and maximum frequency, the minimum frequency of each group of sub-band communication signals is different, and the maximum frequency of each group of sub-band communication signals is different; the minimum frequency and the maximum frequency of the communication input signal refer to the minimum frequency and the maximum frequency of the communication input signal as a complete signal.
Specifically, the communication input signal is a signal received by a repeater, the repeater is used as a repeater between a base station and a mobile station, the communication connection between the base station and the mobile station is realized through an uplink and a downlink, the communication coverage area is expanded, and the communication input signal is a radio frequency signal sent by the base station or the mobile station.
The self-adaptive frequency conversion and frequency shift method provided by the invention carries out parameter configuration according to the requirements of operators and research and development requirements, judges the local oscillator type according to the parameters, and correspondingly calculates the down-conversion local oscillator frequency FhAnd a frequency shift frequency FsAnd correspondingly synthesizing the down-conversion local oscillation signal and the frequency shift signal. The down-conversion local oscillator signal is applied to step S102 shown in fig. 1, so as to perform a plurality of selectable and controllable down-conversion operations on the communication input signal; the frequency shift signal is applied to step S106 shown in fig. 1, so as to perform various selectable and controllable spectrum shifting operations on the multiple groups of sub-band intermediate frequency signals, so as to shift the multiple groups of sub-band intermediate frequency signals to zero frequency.
The self-adaptive frequency conversion and shift method provided by the invention is an improvement aiming at steps S102, S106, S108 and S111 in the process flow of communication input signals of the repeater shown in figure 1, and can quickly obtain a plurality of sets of complete frequency conversion and shift schemes for comparison and reference by simply changing parameter configuration according to actual conditions and requirements, finally find an optimal scheme, greatly shorten the research and development period, reduce the cost and the research and development difficulty and have strong flexibility.
It should be noted that step S111 is to perform a restoring operation on the communication input signal that is performed in step S102, that is, to perform a restoring operation on the communication input signal that is to be down-converted by up-conversion; therefore, compared with the down-conversion local oscillator signal used in step S102, the up-conversion local oscillator signal required in step S111 has the same absolute value and is opposite to any frequency point in the frequency domain.
Similarly, step S108 is a restore operation performed in step S106, that is, an operation of moving the plurality of sub-band intermediate frequency signals shifted from the original position to the zero frequency to the original position again; therefore, the absolute values of the second frequency-shifted signal required in step S108 are equal and the position relative to the zero frequency in the frequency domain is opposite to the absolute values of the frequency-shifted signals used in step S106.
As shown in fig. 1 and 3, the plurality of sets of subband if signals are obtained after the communication input signal is subjected to down-conversion, ADC sampling (analog-to-digital conversion sampling), digital mixing quadrature sampling and half-band filtering.
Step S208 (not shown in fig. 3) mixes the frequency-shifted signals synthesized in step S207 with multiple sets of sub-band intermediate frequency signals, respectively, to implement step S106.
In an alternative embodiment, step S202 specifically includes: calculating a first intermediate frequency F based on a first set of parameterscWhen the first intermediate frequency FcWhen the frequency is larger than zero, judging the local oscillator type to be low local oscillator, and when the first intermediate frequency FcWhen the local oscillation is less than zero, judging that the local oscillation type is high local oscillation; first intermediate frequency FcThe calculation formula of (2) is as follows:
Fc＝Fs-Fh；
wherein, FsFor the centre frequency, F, of the input signalhIs the down-conversion local oscillator frequency.
In particular, the first intermediate frequency FcMixing a communication input signal with a down-conversion local oscillator signal to obtain a first intermediate frequencyThe frequency of the signal. The local oscillation type of the down conversion can be judged through a simple and practical calculation process, and conditions are created for the realization of the step S206.
In an optional embodiment, step S206 specifically includes:
when the local oscillation is low, calculating the frequency shift frequency by adopting a first formula according to the first group of parameters and the second group of parameters; and when the local oscillation is high, calculating the frequency shift frequency by adopting a second formula according to the first group of parameters and the second group of parameters:
the first formula is:
wherein, Fsub_minFor the minimum frequency, F, of the sub-band communication signalsub_maxFor maximum frequency, F, of sub-band communication signalssub_midFor the sub-band intermediate frequency center frequency, FcAt a first intermediate frequency, Fsub_shThe frequency shift frequency of the sub-band intermediate frequency signal is low local oscillation.
The second formula is:
wherein, Fsub_minFor the minimum frequency, F, of the sub-band communication signalsub_maxFor maximum frequency, F, of sub-band communication signalsminFor communication of minimum frequency, F, of input signalmaxFor communication of input signal maximum frequency, Fsub_hsc_shThe frequency shift frequency of the sub-band intermediate frequency signal is the high local oscillator frequency.
Specifically, splitting the first formula to obtain a first sub-formula and a second sub-formula, where the first sub-formula is:
wherein, Fsub_midIs the center frequency of the sub-band intermediate frequency signal.
The second sub-formula is:
Fsub_sh＝abs(Fsub_mid-Fc)。
specifically, splitting the second formula to obtain a third sub-formula and a fourth sub-formula, where the third sub-formula is:
at high local oscillator, the frequency spectrum is inverted, wherein Finv_sub_midAfter spectrum inversion, the center frequency of the intermediate frequency signal is sub-band.
The fourth sub-formula is:
Fsub_osc_sh＝abs(Finv_sub_mid-Fc)。
as will be appreciated by those skilled in the art, all equations in the present invention are labeled as absolute values.
Specifically, after the communication input signal is subjected to down-conversion, ADC sampling and digital mixing orthogonal sampling, when the center frequency point is on the left side of zero frequency, the frequency spectrum shifting direction of the sub-band intermediate frequency signal is from left to right, and when the center frequency point is on the right side of zero frequency, the frequency spectrum shifting direction of the sub-band intermediate frequency signal is from right to left. After the frequency spectrum shifting, the central frequency point of the intermediate frequency signals of the multiple groups of sub-bands is equal to 0.
When the local oscillator is high, the communication input signal may have a spectrum inversion phenomenon after being subjected to the step S102 (down-conversion), at this time, the highest frequency of the wideband of the original communication input signal corresponds to the lowest frequency of the first intermediate frequency signal obtained after the down-conversion, and the lowest frequency of the original communication input signal corresponds to the highest frequency of the first intermediate frequency signal.
It is worth mentioning that the sampling frequency of the quadrature mixing digital sampling process is assumed to be fsamIf the communication input signal is processed in step S102, the first intermediate frequency of the obtained first intermediate frequency signal is obtained
Then the communication input signal goes through steps S102, S103, S104And after S105, the center frequency of the obtained subband intermediate frequency signal is exactly equal to 0. In this case, the frequency shift frequency F corresponding to the high local oscillator and the low local oscillatorshThe sizes are the same, and the frequency shift directions are opposite.
Step S206 combines the configured parameters to determine the required frequency shift frequency through a simple and practical calculation process.
In an optional embodiment, step S207 specifically includes:
s2071: a frequency control word for the first frequency synthesis component is determined based on the frequency-shifted frequency and the second set of parameters.
S2072: and outputting a frequency shift signal with a frequency shift frequency according to the frequency control word by adopting a first frequency synthesis component.
Optionally, step S2071 specifically includes: calculating a frequency control word of the first frequency synthesis component by adopting a third formula according to the frequency shift frequency and the second group of parameters; the third formula is:
wherein, FshFor frequency shifting, C is a frequency control word, FddsN is the bit width of the phase accumulator, which is the frequency of the reference clock signal. In the third formula, the first formula is,
the frequency resolution of the first frequency synthesizing component, also referred to as the step interval.
Specifically, the frequency resolution, and the bit width of the phase accumulator of the reference clock signal are parameters required for the operation of internal devices of a first DDS (Digital Synthesizer), where F is a parameter required for the operation of the internal devices of the first DDS (Digital Synthesizer), and the parameter is a parameter required for the operation of the internal devices of the first DDSddsAnd N can be adjusted according to actual needs to adjust the frequency shift precision.
In step S207, through a simple and practical calculation process, the frequency control word required by the first frequency synthesis component to synthesize the frequency shift signal can be determined.
In actual work, after being put into use, the repeater only supports the network system, the system bandwidth and the broadband sub-band configuration of a specific operator, and has and only has a set of fixed frequency conversion and frequency shift scheme. When the frequency conversion and frequency shift scheme is not suitable any more due to the fact that an operator changes the frequency spectrum design scheme for avoiding the interference signals, research and development need to be carried out again. The cause of the interference signal is unknown, the elimination method is unknown, and the influence on the communication system is unpredictable, so that an operator may repeatedly change the frequency spectrum design scheme, and the frequency conversion and frequency shift scheme of the corresponding repeater also needs to be repeatedly researched and developed for many times, so that the configuration of hardware and software is repeatedly changed. The adaptive frequency conversion and frequency shift method provided by the embodiment is a universal frequency conversion method designed by combining the processing flow of the repeater on the communication input signal after comprehensively analyzing the change of the frequency spectrum design scheme, can realize adaptive frequency conversion and frequency shift through simple parameter configuration and calculation process, greatly shortens the research and development period, and reduces the research and development cost.
Referring to fig. 4, a detailed flowchart of an adaptive frequency conversion and shift method according to another embodiment of the present invention is shown.
In an optional embodiment, in the adaptive frequency conversion and shift method, step S204 specifically includes:
s2041: and mixing the down-conversion local oscillation signal with the communication input signal to obtain a first intermediate frequency signal, thereby realizing self-adaptive frequency conversion.
S2042: and performing ADC (analog to digital converter) sampling, digital frequency mixing orthogonal sampling and half-band filtering processing on the first intermediate frequency signal to obtain a down-conversion signal.
In an optional embodiment, after step S208, the adaptive frequency conversion and shift method further includes the following steps:
s301: and performing digital filtering on the mixed sub-band intermediate frequency signals.
S302: and performing frequency shift on the sub-band intermediate frequency signal subjected to digital filtering to restore the center frequency of the sub-band intermediate frequency signal.
S303: and restoring the plurality of groups of sub-band intermediate frequency signals into a group of second intermediate frequency signals.
S304: and D/A conversion and up-conversion processing are carried out on the second intermediate frequency signal to obtain a group of communication output signals.
It should be noted that the up-conversion processing in step S306 is a reduction operation performed on the down-conversion processing in step S204, that is, a reduction operation is performed on the communication input signal to be down-converted by up-conversion; therefore, compared with the down-conversion local oscillator signal used in step S204, the up-conversion local oscillator signal required in step S306 has the same absolute value, and the position of the up-conversion local oscillator signal relative to any frequency point in the frequency domain is opposite. The up-conversion local oscillator signal and the down-conversion local oscillator signal may be generated by the same frequency generator or may be generated by different frequency generators.
Similarly, step S304 is a restore operation performed in step S208, that is, an operation of moving the plurality of sub-band intermediate frequency signals shifted from the original position to the zero frequency to the original position again; therefore, the absolute values of the third frequency-shifted signal required in step S304 are equal and opposite to the zero frequency in the frequency domain, compared with the frequency-shifted signal used in step S208. The fourth frequency shift signal required in step S304 and the frequency shift signal used in step S208 may be generated by the same frequency generator or different frequency generators.
The down-conversion local oscillator signal is applied to step S301 shown in fig. 1, so as to perform a plurality of selectable and controllable down-conversion operations on the communication input signal; the frequency shift signal is applied to step S207, so as to implement a plurality of selectable and controllable spectrum shifting operations on the plurality of groups of sub-band intermediate frequency signals, so as to shift the plurality of groups of sub-band intermediate frequency signals to zero frequency. According to the practical situation and the requirement, a plurality of complete sets of frequency conversion and frequency shift schemes can be obtained in a self-adaptive mode through simple parameter configuration change so as to be used for comparison and reference, the optimal scheme is finally found, the research and development period is greatly shortened, the cost and the research and development difficulty are reduced, and the flexibility is strong. Research personnel quickly change the local oscillation type, the intermediate frequency and other parameters according to the research and development requirements of products, so that a frequency conversion and frequency shift scheme is generated in a self-adaptive manner.
Fig. 5 is a schematic structural diagram of an adaptive frequency conversion and shift system according to another embodiment of the present invention, which only shows parts related to this embodiment for convenience of description, and the details are as follows:
an adaptive frequency conversion and shift system comprises a parameter configuration module 10, a control module 20, a synthesis module 30 and a frequency mixing module 40.
The parameter configuration module 10 is a parameter configuration module, configured to configure a first group of parameters and a second group of parameters, where the first group of parameters includes a center frequency and a down-conversion local oscillation frequency of a communication input signal; the second set of parameters includes reference clock signal bandwidth, frequency resolution, bit width of the phase accumulator, center frequency point of the sub-band intermediate frequency signal, and bandwidth of the sub-band intermediate frequency signal.
And the control module 20 is configured to determine the first group of parameters to determine a local oscillation type, where the local oscillation type includes a low local oscillation and a high local oscillation, and determine a frequency shift frequency of the sub-band intermediate-frequency signal according to the local oscillation type, the first group of parameters, and the second group of parameters.
A synthesis module 30 for synthesizing a down-converted local oscillator signal having a down-converted local oscillator frequency and for synthesizing a frequency shifted signal having a frequency shifted frequency.
The frequency mixing module 40 is configured to mix the frequency-conversion local oscillator signal with the communication input signal to obtain a down-conversion signal, and to mix the frequency-shifted signal with the sub-band intermediate-frequency signal to shift the center frequency point of the sub-band intermediate-frequency signal to zero frequency, so as to implement adaptive frequency shifting.
In an optional embodiment, the synthesizing module is implemented by using a first frequency synthesizing component and a second frequency synthesizing component, and the second frequency synthesizing component is configured to generate a down-conversion local oscillation signal having a down-conversion local oscillation frequency; the first frequency synthesis component is for generating a frequency shifted signal having a frequency shifted frequency.
Specifically, the first frequency synthesis module is implemented by using a first DDS (Digital Synthesizer), and the second frequency synthesis module is implemented by using a second DDS.
Wherein the first DDS is used for generating a frequency shift signal with a frequency shift frequency; the second DDS is configured to receive a down-converted local oscillator signal having a down-converted local oscillator frequency.
Specifically, the working principle of the DDS is as follows: according to Nyquist samplingStarting from the phase of continuous signal, the sine signal is sampled, coded and quantized to form a sine function table, which is stored in EPROM and the phase increment, so-called step interval, is changed by changing the frequency control word C of its internal phase accumulator when synthesizing signal
The difference in phase increment causes a difference in sampling point within one cycle, and the frequency of the synthesized signal is changed by a change in phase with the sampling frequency of the reference clock signal unchanged.
In an alternative embodiment, the first DDS is built into an FPGA (Field Programmable Gate Array).
In summary, the adaptive frequency conversion and shift method and system provided by the present invention configure parameters of the first frequency synthesis component and the second frequency synthesis component according to the needs of operators and research and development requirements, determine the local oscillator type according to the parameters, and correspondingly calculate the down-conversion local oscillator frequency and the shift frequency to correspondingly synthesize the down-conversion local oscillator signal and the shift frequency signal, thereby implementing various selectable and controllable down-conversion operations and various selectable and controllable frequency spectrum shift operations corresponding to the down-conversion local oscillator signal and the shift frequency signal. In the research and development process, a set of new variable-frequency shift schemes can be obtained by simply calculating only by changing the first group of parameters and the second group of parameters, the configured parameters are different, the variable-frequency shift schemes are different, and self-adaptive variable-frequency shift is realized; through simple parameter configuration test, research personnel can change local oscillator type and intermediate frequency isoparametric fast according to the product development needs, can select the optimum frequency conversion frequency shift scheme from it, effectively avoids interfering signal, improves communication quality, need not to carry out design and change many times repeatedly to the hardware and the software of repeater, has shortened research and development cycle greatly, has reduced the research and development cost, and the flexibility is high.
Various embodiments are described herein for systems and methods. Numerous specific details are set forth in order to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. However, it will be understood by those skilled in the art that the embodiments may be practiced without such specific details. In other instances, well-known operations, components and elements have been described in detail so as not to obscure the embodiments in the description. It will be appreciated by those of ordinary skill in the art that the embodiments herein and shown are non-limiting examples, and thus, it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An adaptive frequency conversion and shift method for frequency conversion and shift processing of a communication input signal, the adaptive frequency conversion and shift method comprising:
configuring a first set of parameters, the first set of parameters including a center frequency and a down-conversion local oscillator frequency of a communication input signal; the communication input signal comprises at least one set of sub-band communication signals;
judging local oscillation types according to the first group of parameters, wherein the local oscillation types comprise a low local oscillation and a high local oscillation;
synthesizing a down-conversion local oscillator signal having the down-conversion local oscillator frequency;
mixing the down-conversion local oscillator signal with a communication input signal to obtain a down-conversion signal, wherein the down-conversion signal comprises at least one group of sub-band intermediate frequency signals;
configuring a second set of parameters including a minimum frequency and a maximum frequency for each set of subband communication signals, and a minimum frequency and a maximum frequency for a communication input signal;
determining the frequency shift frequency of the sub-band intermediate frequency signal according to the local oscillation type, the first group of parameters and the second group of parameters;
generating a frequency shifted signal having a frequency shifted frequency;
and mixing the frequency shift signal with the sub-band intermediate frequency signal, and moving the central frequency point of the sub-band intermediate frequency signal to zero frequency so as to realize self-adaptive frequency shift.
2. The adaptive frequency conversion and shift method according to claim 1, wherein the step of determining the local oscillation type according to the first set of parameters, the local oscillation type including low local oscillation and high local oscillation specifically comprises:
calculating a first intermediate frequency according to the first group of parameters, judging the local oscillator type to be a low local oscillator when the first intermediate frequency is greater than zero, and judging the local oscillator type to be a high local oscillator when the first intermediate frequency is less than zero;
the calculation formula of the first intermediate frequency is as follows:
Fc＝Fs-Fh；
wherein, FcAt a first intermediate frequency, FsFor the centre frequency, F, of the input signalhIs the down-conversion local oscillator frequency.
3. The adaptive frequency conversion and shift method according to claim 2, wherein the step of determining the frequency shift frequency of the sub-band intermediate frequency signal according to the local oscillation type, the first set of parameters, and the second set of parameters specifically comprises:
when the local oscillation is low, calculating the frequency shift frequency of the sub-band intermediate frequency signal by adopting a first formula according to the first group of parameters and the second group of parameters;
the first formula is:
wherein, Fsub_minFor the minimum frequency, F, of the sub-band communication signalsub_maxFor maximum frequency, F, of sub-band communication signalscAt a first intermediate frequency, Fsub_shThe frequency shift frequency of the sub-band intermediate frequency signal is low local oscillation frequency;
when the local oscillation is high, calculating the frequency shift frequency of the sub-band intermediate frequency signal by adopting a second formula according to the first group of parameters and the second group of parameters;
the second formula is:
wherein, Fsub_minFor the minimum frequency, F, of the sub-band communication signalsub_maxFor maximum of subband communication signalFrequency, FminFor communication of minimum frequency, F, of input signalmaxFor communication of input signal maximum frequency, Fsub_osc_shThe frequency shift frequency of the sub-band intermediate frequency signal is the high local oscillator frequency.
4. An adaptive frequency conversion and shift method according to claim 1, wherein the step of generating a frequency shifted signal having a frequency shifted frequency is embodied by:
determining a frequency control word of the first frequency synthesis component according to the frequency shift frequency;
and synthesizing and outputting a frequency shift signal with a frequency shift frequency according to the frequency control word by adopting a first frequency synthesis component.
5. An adaptive frequency conversion and shift method according to claim 4, characterized by the step of determining the frequency control word of the second frequency synthesis component from the shift frequency being embodied as:
calculating a frequency control word of the second frequency synthesis component by adopting a third formula according to the frequency shift frequency;
the third formula is:
wherein, FshTo shift the frequency, C, FddsAnd N are parameters of a second frequency synthesis component, wherein FddsFor the frequency of the reference clock signal, N is the bit width of the phase accumulator and C is the frequency control word.
6. The adaptive frequency conversion and shift method according to claim 1, characterized by the step of mixing the frequency converted local oscillator signal with the communication input signal to obtain a down converted signal, which is specifically:
mixing the down-conversion local oscillation signal with a communication input signal to obtain a first intermediate frequency signal;
and performing analog-to-digital conversion sampling, digital frequency mixing quadrature sampling and half-band filtering processing on the first intermediate frequency signal to obtain a down-conversion signal.
7. The adaptive frequency conversion and shift method according to claim 1, wherein the step of mixing the frequency-shifted signal with the sub-band intermediate frequency signal, and shifting the center frequency point of the sub-band intermediate frequency signal to zero frequency to realize the adaptive frequency shift, further comprises:
carrying out digital filtering on the mixed sub-band intermediate frequency signals;
performing frequency shift on the sub-band intermediate frequency signal subjected to digital filtering to restore the center frequency of the sub-band intermediate frequency signal;
reducing the plurality of groups of sub-band intermediate frequency signals into a group of second intermediate frequency signals;
and D/A conversion and up-conversion processing are carried out on the second intermediate frequency signal to obtain a group of communication output signals.
8. An adaptive frequency conversion and shift system for frequency converting and shifting a communications input signal, the adaptive frequency conversion and shift system comprising:
a parameter configuration module, configured to configure a first set of parameters and a second set of parameters, where the first set of parameters includes a center frequency and a down-conversion local oscillation frequency of the communication input signal; the second set of parameters includes a minimum frequency and a maximum frequency of each set of subband communication signals, and a minimum frequency and a maximum frequency of a communication input signal;
the control module is used for judging the first group of parameters to judge the local oscillation type, wherein the local oscillation type comprises a low local oscillation and a high local oscillation, and determining the frequency shift frequency of the sub-band intermediate frequency signal according to the local oscillation type, the first group of parameters and the second group of parameters;
a synthesizing module, configured to synthesize a down-conversion local oscillator signal having the down-conversion local oscillator frequency, and synthesize a frequency-shifted signal having the frequency-shifted frequency;
and the frequency mixing module is used for mixing the down-conversion local oscillation signal with the communication input signal to obtain a down-conversion signal, mixing the frequency shift signal with the sub-band intermediate frequency signal, and shifting the center frequency point of the sub-band intermediate frequency signal to zero frequency to realize self-adaptive frequency shift.
9. The adaptive frequency conversion and shift system according to claim 8, wherein the synthesis module is implemented using a first frequency synthesis component and a second frequency synthesis component;
the second frequency synthesis component is used for generating a down-conversion local oscillator signal with the down-conversion local oscillator frequency;
the first frequency synthesis component is configured to generate a frequency shifted signal having the frequency shifted frequency.
10. The adaptive frequency conversion and shift system of claim 9, wherein the first frequency synthesizing component is built into a field programmable gate array.
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