CN114024817B - Method for optimizing and designing 5G new waveform of orthogonal multi-wavelet packet by time-frequency - Google Patents
Method for optimizing and designing 5G new waveform of orthogonal multi-wavelet packet by time-frequency Download PDFInfo
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Abstract
The application discloses a method for time-frequency optimization design of an orthogonal multi-wavelet packet 5G new waveform, which comprises the following steps: obtaining a first original digital signal; parallel segmentation is carried out on serial data of the first original digital signal, and N parallel sub-signals are obtained; respectively carrying out modulation mapping on the N parallel sub-signals to obtain N parallel sub-carriers; based on an orthogonal frequency division multiplexing technology, carrying out superposition processing on signal spectrums of the N parallel subcarriers to obtain a first processed waveform; optimizing design is carried out on the first processed waveform based on a time-frequency optimizing design multi-wavelet basis function, and an orthogonal multi-wavelet packet 5G new waveform is obtained; and transmitting the new waveform of the orthogonal multi-wavelet packet 5G based on a wireless signal transmission channel. The method solves the technical problems that the waveform optimization design of the multi-wavelet basis function is not utilized and the attenuation speed outside the power band is insufficient in the prior art.
Description
Technical Field
The application relates to the field of mobile communication, in particular to a method for designing a new waveform of an orthogonal multi-wavelet packet 5G through time-frequency optimization.
Background
Due to orthogonality between subcarriers, their signal spectrum allows superposition, making their spectrum utilization much higher than single carrier systems. However, since a plurality of sub-carriers are adopted, the Peak-to-Average Power Ratio (Peak-to-average power ratio, abbreviated as PAPR, abbreviated as Peak-to-average power ratio) of the transmitted signal is higher, a parameter set of 12 sub-carriers is adopted in the 5G New Radio (abbreviated as NR), the Cyclic Prefix (CP) OFDM is adopted in the downlink, the Peak-to-average power ratio is up to 11-13 dB, the orthogonal frequency division multiplexing (DFT-S-OFDM) of CP-OFDM or discrete Fourier transform spread spectrum is adopted in the uplink, and the Peak-to-average power ratio of DFT-S-OFDM is 6-9 dB. However, the adverse effect on pilot design caused by DFT-S-OFDM is not as good as that caused by ofdma+simple clipping scheme.
In the process of realizing the technical scheme in the embodiment of the application, the inventor discovers that the above technology at least has the following technical problems:
in the prior art, the technical problem that the waveform optimization design characteristic of the multi-wavelet basis function is not utilized and the attenuation speed outside the power band is insufficient exists.
Disclosure of Invention
The application aims to provide a method for optimizing and designing a new waveform of an orthogonal multi-wavelet packet 5G by time-frequency, which solves the technical problems that the waveform optimization design characteristic of a multi-wavelet basis function is not utilized and the attenuation speed outside a power band is insufficient in the prior art. By realizing two-dimensional orthogonal multiplexing in a time-frequency domain, the number of subcarriers of a system is reduced to reduce the peak-to-average ratio of the system and improve the utilization rate of a frequency band, and the characteristic that a multi-wavelet basis function can be used for waveform optimization design is further utilized, the multi-wavelet function with the minimum time-frequency atom is designed, and the product delta fΔf of the duration of the function and the frequency band width, namely a resolution atom (also called information atom), is minimum, so that the technical effects of reducing side lobe power and improving the utilization rate of the frequency band of the system are achieved.
In view of the above problems, the embodiment of the application provides a method for designing a new waveform of an orthogonal multi-wavelet packet 5G in a time-frequency optimization manner.
In a first aspect, the present application provides a method for time-frequency optimization design of a new waveform of an orthogonal multi-wavelet packet 5G, wherein the method includes: obtaining a first original digital signal; parallel segmentation is carried out on serial data of the first original digital signal, and N parallel sub-signals are obtained; respectively carrying out modulation mapping on the N parallel sub-signals to obtain N parallel sub-carriers; based on an orthogonal frequency division multiplexing technology, carrying out superposition processing on signal spectrums of the N parallel subcarriers to obtain a first processed waveform; optimizing design is carried out on the first processed waveform based on a time-frequency optimizing design multi-wavelet basis function, and an orthogonal multi-wavelet packet 5G new waveform is obtained; and transmitting the new waveform of the orthogonal multi-wavelet packet 5G based on a wireless signal transmission channel.
In another aspect, the present application further provides a system for time-frequency optimization design of a new waveform of an orthogonal multi-wavelet packet 5G, where the system includes: a first obtaining unit: the first obtaining unit is used for obtaining a first original digital signal; a first dividing unit: the first dividing unit is used for carrying out parallel division on serial data of the first original digital signal to obtain N parallel sub-signals; a first mapping unit: the first mapping unit is used for respectively carrying out modulation mapping on the N parallel sub-signals to obtain N parallel sub-carriers; a first superimposing unit: the first superposition unit is used for performing superposition processing on the signal spectrums of the N parallel subcarriers based on an orthogonal frequency division multiplexing technology to obtain a first processed waveform; a first design unit: the first design unit is used for optimally designing the multi-wavelet basis function based on time-frequency optimization, and optimally designing the first processed waveform to obtain an orthogonal multi-wavelet packet 5G new waveform; a first transmitting unit: the first transmitting unit is configured to transmit the new waveform of the orthogonal multi-wavelet packet 5G based on a wireless signal transmission channel.
In a third aspect, an embodiment of the present application further provides a system for designing a new waveform of an orthogonal multi-wavelet packet 5G in a time-frequency optimization manner, including a memory, a processor, and a computer program stored on the memory and capable of running on the processor, where the processor implements the steps of the method described in the first aspect when executing the program.
One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:
Obtaining a first original digital signal is adopted; parallel segmentation is carried out on serial data of the first original digital signal, and N parallel sub-signals are obtained; respectively carrying out modulation mapping on the N parallel sub-signals to obtain N parallel sub-carriers; based on an orthogonal frequency division multiplexing technology, carrying out superposition processing on signal spectrums of the N parallel subcarriers to obtain a first processed waveform; optimizing design is carried out on the first processed waveform based on a time-frequency optimizing design multi-wavelet basis function, and an orthogonal multi-wavelet packet 5G new waveform is obtained; and transmitting the new waveform of the orthogonal multi-wavelet packet 5G based on a wireless signal transmission channel. By realizing two-dimensional orthogonal multiplexing in a time-frequency domain, the number of subcarriers of a system is reduced to reduce the peak-to-average ratio of the system and improve the utilization rate of a frequency band, and the characteristic that a multi-wavelet basis function can be used for waveform optimization design is further utilized, the multi-wavelet function with the minimum time-frequency atom is designed, so that the product of the duration of the function and the frequency band width is obtained The resolution ratio atoms (also called information atoms) are minimum, so that the technical effects of reducing side lobe power and improving the utilization ratio of the system frequency band are achieved.
The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, it being obvious that the drawings in the description below are only exemplary and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for designing a new waveform of an orthogonal multi-wavelet packet 5G in a time-frequency optimization manner according to an embodiment of the present application;
FIG. 2 is a schematic flow chart of obtaining a first waveform optimization parameter in a method for designing a new waveform of an orthogonal multi-wavelet packet 5G in a time-frequency optimization manner according to an embodiment of the present application;
fig. 3 is a schematic flow chart of obtaining a new waveform of an orthogonal multi-wavelet packet 5G in a method for optimizing and designing the new waveform of the orthogonal multi-wavelet packet 5G according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a method for designing a new waveform of an orthogonal multi-wavelet packet 5G according to an embodiment of the present application;
Fig. 5 is a schematic structural diagram of an exemplary electronic device according to an embodiment of the present application.
Reference numerals illustrate:
The system comprises a first obtaining unit 11, a first dividing unit 12, a first mapping unit 13, a first superimposing unit 14, a first designing unit 15, a first transmitting unit 16, a bus 300, a receiver 301, a processor 302, a transmitter 303, a memory 304, and a bus interface 305.
Detailed Description
The embodiment of the application solves the technical problems that the waveform optimization design of the multi-wavelet basis function is not utilized and the attenuation speed outside the power band is insufficient in the prior art by providing a method for optimizing and designing the new waveform of the orthogonal multi-wavelet packet 5G. By realizing two-dimensional orthogonal multiplexing in a time-frequency domain, the number of subcarriers of a system is reduced to reduce the peak-to-average ratio of the system and improve the utilization rate of a frequency band, and the characteristic that a multi-wavelet basis function can be used for waveform optimization design is further utilized, the multi-wavelet function with the minimum time-frequency atom is designed, so that the product of the duration of the function and the frequency band width is obtainedThe resolution ratio atoms (also called information atoms) are minimum, so that the technical effects of reducing side lobe power and improving the utilization ratio of the system frequency band are achieved.
In the following, the technical solutions of the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments of the present application, and the present application is not limited by the exemplary embodiments described herein. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present application are shown.
Summary of the application
Due to orthogonality between subcarriers, their signal spectrum allows superposition, making their spectrum utilization much higher than single carrier systems. However, since a plurality of sub-carriers are adopted, the Peak-to-Average Power Ratio (Peak-to-average power ratio, abbreviated as PAPR, abbreviated as Peak-to-average power ratio) of the transmitted signal is higher, a parameter set of 12 sub-carriers is adopted in the 5G New Radio (abbreviated as NR), the Cyclic Prefix (CP) OFDM is adopted in the downlink, the Peak-to-average power ratio is up to 11-13 dB, the orthogonal frequency division multiplexing (DFT-S-OFDM) of CP-OFDM or discrete Fourier transform spread spectrum is adopted in the uplink, and the Peak-to-average power ratio of DFT-S-OFDM is 6-9 dB. However, the adverse effect on pilot design caused by DFT-S-OFDM is not as good as that caused by ofdma+simple clipping scheme. In the prior art, the waveform optimization design of the multi-wavelet basis function is not utilized, and meanwhile, the attenuation speed outside the power band is insufficient.
Aiming at the technical problems, the technical scheme provided by the application has the following overall thought:
The application provides a method for time-frequency optimization design of a new waveform of an orthogonal multi-wavelet packet 5G, wherein the method comprises the following steps: obtaining a first original digital signal; parallel segmentation is carried out on serial data of the first original digital signal, and N parallel sub-signals are obtained; respectively carrying out modulation mapping on the N parallel sub-signals to obtain N parallel sub-carriers; based on an orthogonal frequency division multiplexing technology, carrying out superposition processing on signal spectrums of the N parallel subcarriers to obtain a first processed waveform; optimizing design is carried out on the first processed waveform based on a time-frequency optimizing design multi-wavelet basis function, and an orthogonal multi-wavelet packet 5G new waveform is obtained; and transmitting the new waveform of the orthogonal multi-wavelet packet 5G based on a wireless signal transmission channel.
Having described the basic principles of the present application, various non-limiting embodiments of the present application will now be described in detail with reference to the accompanying drawings.
Example 1
Referring to fig. 1, an embodiment of the present application provides a method for designing a new waveform of an orthogonal multi-wavelet packet 5G in a time-frequency optimization manner, which specifically includes the following steps:
step S100: obtaining a first original digital signal;
step S200: parallel segmentation is carried out on serial data of the first original digital signal, and N parallel sub-signals are obtained;
In particular, due to orthogonality between subcarriers, their signal spectrum allows superposition, so that their spectrum utilization is much improved over single carrier systems. However, since a plurality of sub-carriers are adopted, the Peak-to-Average Power Ratio (Peak-to-average power ratio, abbreviated as PAPR, abbreviated as Peak-to-average power ratio) of the transmitted signal is higher, a parameter set of 12 sub-carriers is adopted in the 5G New Radio (abbreviated as NR), the Cyclic Prefix (CP) OFDM is adopted in the downlink, the Peak-to-average power ratio is up to 11-13 dB, the orthogonal frequency division multiplexing (DFT-S-OFDM) of CP-OFDM or discrete Fourier transform spread spectrum is adopted in the uplink, and the Peak-to-average power ratio of DFT-S-OFDM is 6-9 dB. However, the adverse effect on pilot design caused by DFT-S-OFDM is not as good as that caused by ofdma+simple clipping scheme. However, in the prior art, the waveform optimization design of the multi-wavelet basis function is not utilized, and meanwhile, the attenuation speed outside the power band is insufficient. In order to solve the problems, the embodiment of the application provides an orthogonal multi-wavelet packet 5G New waveform (New Radio) scheme based on time-frequency optimization waveform design, namely, on the basis of MWPT-OFDM scheme, the characteristics of waveform optimization design can be further utilized by multi-wavelet basis function, and the multi-wavelet function with the minimum time-frequency atom is designed so that the product of the duration of the function and the bandwidth of the frequency band The resolution ratio atoms (also called information atoms) are minimum, wherein the first original digital signal is an original digital signal needing waveform optimization, and the N parallel sub-signals are signals obtained by serially dividing the original digital signal.
Step S300: respectively carrying out modulation mapping on the N parallel sub-signals to obtain N parallel sub-carriers;
Step S400: based on an orthogonal frequency division multiplexing technology, carrying out superposition processing on signal spectrums of the N parallel subcarriers to obtain a first processed waveform;
Further, step S400 includes:
step S410: according to Superposing signal spectrums of the N parallel subcarriers;
Step S420: wherein, the number of subcarriers n=r.2 2 L, r is the multiple wavelet weight, L is the multiple wavelet packet decomposition layer number, and M is the multiple wavelet time domain support length.
Specifically, an orthogonal frequency division multiplexing (MWPT-OFDM) signal based on an orthogonal multi-wavelet packet can be expressed as:
Where the number of subcarriers n=r·2 L, r is the number of multiple wavelet weights, L is the number of multiple wavelet packet decomposition layers, M is the multiple wavelet time domain support length, for example, when CL3 multiple wavelet is used, the number of subcarriers is 4, the system peak-to-average ratio is 7.8854dB, 3 to 5dB lower than 11 to 13dB of CP-OFDM of 5G NR downlink signal, and reaches the range of 6 to 9dB required by orthogonal frequency division multiplexing (DFT-S-OFDM) of 5G NR uplink signal discrete fourier transform spread spectrum. The original electrical signal at the transmitting end in a communication system typically has spectral components with very low frequencies and is generally not suitable for transmission directly in a channel. Therefore, it is often necessary to transform the original signal into a high frequency signal with a frequency band suitable for channel transmission, a process called modulation. Signal modulation is a process or treatment that changes certain characteristics of one waveform from another waveform or signal. In radio communication, electromagnetic waves are utilized as a carrier of information. The original signal can be subjected to frequency spectrum shifting through modulation, and the modulated signal is called a modulated signal, carries information and is suitable for transmission in a channel. The N parallel sub-carriers are the results obtained by modulating the N parallel sub-signals, where the basic principle of OFDM is to divide a signal into N sub-signals based on a fourier-based orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, abbreviated as OFDM), and then modulate N mutually orthogonal sub-carriers with the N sub-signals. Due to orthogonality between subcarriers, their signal spectrum allows superposition, making their spectrum utilization much higher than single carrier systems. The first processed waveform is the result of superposition processing on the signal spectrums of the N parallel subcarriers.
Step S500: optimizing design is carried out on the first processed waveform based on a time-frequency optimizing design multi-wavelet basis function, and an orthogonal multi-wavelet packet 5G new waveform is obtained;
Step S600: and transmitting the new waveform of the orthogonal multi-wavelet packet 5G based on a wireless signal transmission channel.
Further, step S500 includes:
step S510: obtaining a multi-wavelet support length according to the first processed waveform;
step S520: and designing the multi-wavelet support length based on a minimum time-frequency atom to generate the multi-wavelet basis function.
Specifically, on the basis of MWPT-OFDM scheme, the characteristics of waveform optimization design can be further utilized by the multi-wavelet basis function, so that the multi-wavelet function with the minimum time-frequency atom is designed, namely, according to the support length of the multi-wavelet and the minimum time-frequency atom, the multi-wavelet function with symmetry/antisymmetry is designed. For a window function f (with some smoothness and attenuation), the time domain duration Δ f is defined as: Here, the Is the center of the time domain, defined as: /(I) Frequency bandwidth of fCan be defined in the same way, using/>F is substituted. There is/>If and only if f is a Gaussian function/>The equal sign is taken. Product of duration and frequency bandwidth/>Referred to as resolution atoms. The time-frequency optimized multi-wavelet with the time domain support of [0,3] is applied to MWPT-OFDM scheme, and the fact that the partially optimized multi-wavelet has lower side lobe power and higher frequency band utilization rate under the condition that the peak-to-average ratio of the system is basically kept unchanged is found. Further, as shown in fig. 2, the embodiment of the present application further includes:
Step S710: presetting a first time domain supporting interval;
Step S720: according to the first time domain support interval, performing time-frequency optimization on multiple wavelets of a first orthogonal base function and a second orthogonal base function respectively;
step S730: sequentially obtaining a first optimization result and a second optimization result of the time-frequency optimization;
step S740: performing waveform analysis on the first optimization result to obtain a first orthogonal basis function time domain waveform diagram;
Step S750: performing waveform analysis on the second optimization result to obtain a second orthogonal basis function time domain waveform diagram;
Step S760: and respectively comparing the first orthogonal base function time domain waveform diagram and the second orthogonal base function time domain waveform diagram with waveform diagrams of preset orthogonal base functions to obtain a first waveform optimization parameter.
Specifically, the first orthogonal basis function is JQT4, the second orthogonal basis function is JQT5, time-frequency optimization of multiple wavelets JQT4 and JQT5 of time domain support [0,3] is adopted, so that the 5G NR waveform based on the multiple wavelets has lower side lobe power and higher frequency band utilization rate than CL3 wavelets, 5.62% and 6.56% are respectively improved relative to CL3, the peak-to-average ratio of the system is increased by 0.0993dB and 0.1416dB respectively, the increase is small, the first time domain support interval is time domain support [0,3], according to the first time domain support interval, the multiple wavelets of the first orthogonal basis function and the second orthogonal basis function are respectively optimized in time-frequency, namely time domain and frequency domain are respectively optimized, then the optimized waveform is analyzed, the qt waveform map of the first orthogonal basis function and the second orthogonal basis function is compared with the waveform map of the preset orthogonal basis function, the preset orthogonal basis function is the jcl 4, and the first orthogonal basis function is obtained, namely the first orthogonal basis function is optimized, and the first orthogonal basis function is optimized based on the first orthogonal basis function 4.
Further, as shown in fig. 3, the embodiment of the present application further includes:
step S810: performing time-frequency optimization on multiple wavelets of a third orthogonal basis function based on the first time domain support interval;
step S820: obtaining a third optimization result of the time-frequency optimization;
Step S830: performing waveform analysis on the third optimization result to obtain a third orthogonal basis function time domain waveform diagram;
Step S840: performing waveform comparison on the third orthogonal basis function time domain waveform diagram and the waveform diagram of the preset orthogonal basis function to obtain a second waveform optimization parameter;
Step S850: and optimally designing the first output waveform according to the first waveform optimization parameter and the second waveform optimization parameter to obtain the new waveform of the orthogonal multi-wavelet packet 5G.
Specifically, the third orthogonal basis function is SA4, namely, the multi-wavelet SA4 adopting time domain support [0,3] enables the 5G NR waveform based on the multi-wavelet packet to have lower side lobe power and higher frequency band utilization rate than the CL3 multi-wavelet, the system peak-to-average ratio is increased by 5.62% relative to CL3, and the system peak-to-average ratio is increased by only 0.102dB.
More specifically, under the condition of 5G NR format, the same time domain support length and sampling point number: MWPT-OFDM employing the time-frequency optimization design basis function has a lower peak-to-average ratio than orthogonal Shan Xiaobo packet dB2-OFDM and FFT-OFDM based on fourier transform, and although the theoretical limit 6.2326dB of MWPT-OFDM (m=3) in 5G NR format is not reached, the theoretical value is lower than that of FFT-OFDM of 5G NR. The MWPT-OFDM signal spectrum energy of the base function is more concentrated by adopting the time-frequency optimization design, and the first side lobe of the spectrum is lower. MWPT-OFDM employing the time-frequency optimization design basis function has higher spectrum utilization than CL3-OFDM, dB2-OFDM and FFT-OFDM. By adopting MWPT-OFDM of the time-frequency optimization design base function, the frequency band utilization rate is improved, meanwhile, the peak-to-average ratio of different degrees is increased relative to CL3-OFDM, and base functions with high frequency band utilization rate and little peak-to-average ratio increase such as SA4, JQT4 and JQT5 can be selected from a plurality of time-frequency optimization base functions for use. MWPT-OFDM4, CL3-OFDM4, dB2-OFDM4 and FFT-OFDM12 adopting a time-frequency optimization design basis function have the same bit error rate (BPSK) under a Gaussian channel.
Further, the original output waveform may be optimized based on the first, second, and third orthogonal basis functions JQT4, JQT5, and SA 4. The orthogonal multi-wavelet packet orthogonal frequency division multiplexing technology (MWPT-OFDM) adopting the time-frequency optimization design basis function is used for 5G NR, has lower peak-to-average ratio than the orthogonal frequency division multiplexing technology (FFT-OFDM) 5G NR based on Fourier transform, and can achieve the peak-to-average ratio effect of DFT-S-OFDM. The MWPT-OFDM with the time-frequency optimization design basis function has higher frequency band utilization rate and first side lobe power than CL3-OFDM4, dB2-OFDM4 and FFT-OFDM12, and is a transmission mode more suitable for 5G New Radio at the cost of slightly increasing peak-to-average ratio.
Further, the step S760 includes:
step S761: obtaining a first comparison parameter, wherein the first comparison parameter comprises a frequency band utilization rate, a first side lobe power and a peak-to-average ratio;
Step S762: and respectively comparing the first orthogonal base function time domain waveform diagram and the second orthogonal base function time domain waveform diagram with a waveform diagram of a preset orthogonal base function according to the first comparison parameter.
Specifically, when the waveform diagrams are compared, comparison can be performed based on the first comparison parameter, wherein the frequency band utilization rate, namely an index describing the relationship between the data transmission rate and the bandwidth, is also an index for measuring the effectiveness of the data communication system; the first side lobe power, i.e. the antenna pattern, generally has two or more lobes, wherein the lobe with the greatest radiation intensity is called the main lobe and the remaining lobes are called side lobes or side lobes; the Peak-to-average power ratio (Peak-to-Average Power Ratio, abbreviated PAPR), is a measured parameter of a waveform, and is equal to a ratio of the square of the amplitude of the waveform divided by the square of the effective value (RMS).
By adopting MWPT-OFDM of a time-frequency optimization design basis function, the two-dimensional multiplexing characteristic of orthogonal multi-wavelet packet time domain-frequency domain can be utilized, so that the number of subcarriers required by the system is reduced when the same data rate is transmitted, and the peak-to-average ratio is reduced. The number of MWPT-OFDM4 and orthogonal wavelet dB2-OFDM4 of a base function is reduced by 8 compared with the number of FFT-OFDM12 sub-carriers based on Fourier transform under the 5G NR format, and the 4 sub-functions can meet the requirement of data transmission, although one frame can only bear 160 signal codes, 8 signal codes are fewer than the FFT-OFDM, the obtained peak-to-average ratio reduction effect is obvious, and the peak-to-average ratio effect of 6-9 dB of DFT-S-OFDM can be achieved.
Compared with CL3-OFDM4, dB2-OFDM4 and FFT-OFDM12, MWPT-OFDM adopting time-frequency optimization design has higher frequency band utilization rate and lower side lobe power, but the peak-to-average ratio brings different degrees of rising, the frequency band utilization rate is high, and the time domain control is relatively loose after the frequency domain is well controlled, and the measurement inaccuracy principle is basically consistent. In the case of the same time domain support length, it is necessary to optimize between the increase in the frequency band utilization and the decrease in the peak-to-average ratio, for example, JQT4 and SA4 have a higher frequency band utilization (increase of 5.62%) than CL3, while the increase in the peak-to-average ratio is not much, but only 0.1dB.
In summary, the method for optimizing and designing the new waveform of the orthogonal multi-wavelet packet 5G by the time-frequency provided by the embodiment of the application has the following technical effects:
1. The peak-to-average ratio of the multi-wavelet-based OFDM after time-frequency optimization design is low relative to the FFT-OFDM system. The following beneficial effects can be brought: the complexity of A/D and D/A is reduced. The requirements of the amplifier for linear range are reduced. The gain of the power amplifier is reduced to a small quantity, the cost of the radio frequency power amplifier is reduced, the power consumption of the system is reduced, and the heat dissipation requirement is low. The encryption effect makes it difficult to crack the signal without knowing the basis functions employed.
2. The frequency band utilization rate is high. Compared with the traditional FFT-OFDM, the B 0.99 can save the frequency band by 30.2% -34.3%, and the utilization rate of the frequency band is improved by 1.05% -6.79% compared with the CL3-OFDM, while the rise of the peak-to-average ratio is brought, the rise is only 0.0993-0.4611 dB, and waveforms which can be optimized between the balance consideration frequency band utilization rate and the peak-to-average ratio, such as JQT4 and SA4, have high frequency band utilization rate and lower peak-to-average ratio.
3. The side lobe power is as low as-23.9 dB, which is lower than-19.4 dB of CL3 MWPT-OFDM, and is far lower than-13 dB of FFT-OFDM, and the interference to adjacent channels is small.
4. The computational complexity of the multi-wavelet after the time-frequency optimization design is unchanged.
5. The non-uniform dividing capability of the original physical resource blocks based on multiple wavelets is reserved.
Example two
Based on the same inventive concept as the method for optimizing and designing the new waveform of the orthogonal multi-wavelet packet 5G in the previous embodiment, the invention also provides a system for optimizing and designing the new waveform of the orthogonal multi-wavelet packet 5G in the time-frequency, please refer to fig. 4, the system includes:
The first obtaining unit 11: the first obtaining unit 11 is configured to obtain a first original digital signal;
The first dividing unit 12: the first dividing unit 12 is configured to divide the serial data of the first original digital signal in parallel to obtain N parallel sub-signals;
The first mapping unit 13: the first mapping unit 13 is configured to perform modulation mapping on the N parallel sub-signals to obtain N parallel sub-carriers;
The first superimposing unit 14: the first superimposing unit 14 is configured to perform a superimposing process on signal spectrums of the N parallel subcarriers based on an orthogonal frequency division multiplexing technology, so as to obtain a first digital transmission signal;
The first design unit 15: the first design unit 15 is configured to send the first digital sending signal based on a wireless signal sending channel, and the wireless signal receiving end obtains a first receiving signal, performs waveform analysis, and obtains a first output waveform;
The first transmitting unit 16: the first sending unit 16 is configured to optimally design the first output waveform based on the multi-wavelet basis function, so as to obtain a new waveform of the orthogonal multi-wavelet packet 5G.
Further, the system further comprises:
a second obtaining unit: the second obtaining unit is used for obtaining a multi-wavelet supporting length according to the first output waveform;
A second design unit: the second design unit is configured to design the multi-wavelet support length based on a minimum time-frequency atom, and generate the multi-wavelet basis function.
Further, the system further comprises:
A first preset unit: the first preset unit is used for presetting a first time domain support interval;
A first optimizing unit: the first optimizing unit is used for performing time-frequency optimization on multiple wavelets of a first orthogonal base function and a second orthogonal base function according to the first time domain supporting interval;
A third obtaining unit: the third obtaining unit is used for sequentially obtaining a first optimizing result and a second optimizing result of the time-frequency optimization;
A first analyzing unit: the first analysis unit is used for carrying out waveform analysis on the first optimization result to obtain a first orthogonal basis function time domain waveform diagram;
a second analyzing unit: the second analysis unit is used for carrying out waveform analysis on the second optimization result to obtain a second orthogonal basis function time domain waveform diagram;
A first comparison unit: the first comparison unit is used for respectively comparing the first orthogonal base function time domain waveform diagram and the second orthogonal base function time domain waveform diagram with the waveform diagram of the preset orthogonal base function to obtain a first waveform optimization parameter.
Further, the system further comprises:
a second optimizing unit: the second optimizing unit is used for performing time-frequency optimization on multiple wavelets of a third orthogonal basis function based on the first time domain supporting interval;
fourth obtaining unit: the fourth obtaining unit is used for obtaining a third optimizing result of the time-frequency optimization;
a third analysis unit: the third analysis unit is used for carrying out waveform analysis on the third optimization result to obtain a third orthogonal basis function time domain waveform diagram;
A second comparison unit: the second comparison unit is used for comparing the waveform of the third orthogonal basis function time domain waveform diagram with the waveform diagram of the preset orthogonal basis function to obtain a second waveform optimization parameter;
A third optimizing unit: the third optimizing unit is used for optimizing and designing the first output waveform according to the first waveform optimizing parameter and the second waveform optimizing parameter to obtain the new waveform of the orthogonal multi-wavelet packet 5G.
Further, the system further comprises:
A second superimposing unit: the second superposition unit is used for according to Superposing signal spectrums of the N parallel subcarriers; wherein, the number of subcarriers n=r.2 2 L, r is the multiple wavelet weight, L is the multiple wavelet packet decomposition layer number, and M is the multiple wavelet time domain support length.
Further, the system further comprises:
fifth obtaining unit: the fifth obtaining unit is configured to obtain a first comparison parameter, where the first comparison parameter includes a frequency band utilization rate, a first side lobe power, and a peak-to-average ratio;
a third comparison unit: the third comparison unit is configured to compare the first orthogonal basis function time domain waveform map and the second orthogonal basis function time domain waveform map with a waveform map of a preset orthogonal basis function according to the first comparison parameter.
Various embodiments in the present disclosure are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the foregoing method and specific example for designing a new waveform of an orthogonal multi-wavelet packet 5G by using a time-frequency optimization in the first embodiment of fig. 1 are equally applicable to a system for designing a new waveform of an orthogonal multi-wavelet packet 5G by using a time-frequency optimization in the first embodiment, and by describing the foregoing method for designing a new waveform of an orthogonal multi-wavelet packet 5G by using a time-frequency optimization in the second embodiment in detail, those skilled in the art can clearly know the system for designing a new waveform of an orthogonal multi-wavelet packet 5G by using a time-frequency optimization in the first embodiment, so that the details of the description will not be repeated here. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Exemplary electronic device
An electronic device of an embodiment of the present application is described below with reference to fig. 5.
Fig. 5 illustrates a schematic structural diagram of an electronic device according to an embodiment of the present application.
Based on the inventive concept of a method for time-frequency optimally designing a new waveform of an orthogonal multi-wavelet packet 5G according to the previous embodiments, the present invention further provides a system for time-frequency optimally designing a new waveform of an orthogonal multi-wavelet packet 5G, on which a computer program is stored, which program, when executed by a processor, implements the steps of any of the methods for time-frequency optimally designing a new waveform of an orthogonal multi-wavelet packet 5G described above.
Where in FIG. 5, a bus architecture (represented by bus 300), bus 300 may comprise any number of interconnected buses and bridges, with bus 300 linking together various circuits, including one or more processors, represented by processor 302, and memory, represented by memory 304. Bus 300 may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., as are well known in the art and, therefore, will not be described further herein. Bus interface 305 provides an interface between bus 300 and receiver 301 and transmitter 303. The receiver 301 and the transmitter 303 may be the same element, i.e. a transceiver, providing a means for communicating with various other apparatus over a transmission medium.
The processor 302 is responsible for managing the bus 300 and general processing, while the memory 304 may be used to store data used by the processor 302 in performing operations.
The application provides a method for time-frequency optimization design of a new waveform of an orthogonal multi-wavelet packet 5G, wherein the method comprises the following steps: obtaining a first original digital signal; parallel segmentation is carried out on serial data of the first original digital signal, and N parallel sub-signals are obtained; respectively carrying out modulation mapping on the N parallel sub-signals to obtain N parallel sub-carriers; based on an orthogonal frequency division multiplexing technology, carrying out superposition processing on signal spectrums of the N parallel subcarriers to obtain a first processed waveform; optimizing design is carried out on the first processed waveform based on a time-frequency optimizing design multi-wavelet basis function, and an orthogonal multi-wavelet packet 5G new waveform is obtained; and transmitting the new waveform of the orthogonal multi-wavelet packet 5G based on a wireless signal transmission channel. The method solves the technical problems that the waveform optimization design of the multi-wavelet basis function is not utilized in the prior art, and meanwhile, the attenuation speed outside the power band is insufficient. By realizing two-dimensional orthogonal multiplexing in a time-frequency domain, the number of subcarriers of a system is reduced to reduce the peak-to-average ratio of the system and improve the utilization rate of a frequency band, and the characteristic that a multi-wavelet basis function can be used for waveform optimization design is further utilized, the multi-wavelet function with the minimum time-frequency atom is designed, so that the product of the duration of the function and the frequency band width is obtainedThe resolution ratio atoms (also called information atoms) are minimum, so that the technical effects of reducing side lobe power and improving the utilization ratio of the system frequency band are achieved.
It will be apparent to those skilled in the art that embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, the present application may take the form of an entirely software embodiment, an entirely hardware embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application is in the form of a computer program product that can be embodied on one or more computer-usable storage media including computer-usable program code. And the computer-usable storage medium includes, but is not limited to: u disk, mobile hard disk, read-0nly Memory (ROM), RAM (Random Access Memory, RAM), magnetic disk Memory, CD-ROM (Compact Disc Read-Only Memory), optical Memory, etc. for storing program codes.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a system for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks. While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (7)
1. A method of time-frequency optimization design of an orthogonal multi-wavelet packet 5G new waveform, wherein the method comprises:
Obtaining a first original digital signal;
parallel segmentation is carried out on serial data of the first original digital signal, and N parallel sub-signals are obtained;
respectively carrying out modulation mapping on the N parallel sub-signals to obtain N parallel sub-carriers;
Based on an orthogonal frequency division multiplexing technology, carrying out superposition processing on signal spectrums of the N parallel subcarriers to obtain a first processed waveform;
optimizing the design of the first processed waveform based on a time-frequency optimization design multi-wavelet basis function to obtain an orthogonal multi-wavelet packet 5G new waveform, wherein the optimization design of the first processed waveform aims at multiplying the duration and the frequency bandwidth Minimum;
transmitting the new waveform of the orthogonal multi-wavelet packet 5G based on a wireless signal transmission channel;
Wherein the multi-wavelet based basis function comprises:
Obtaining a multi-wavelet time domain support length according to the first processed waveform;
Generating the multi-wavelet basis function based on a minimum time-frequency atom, the minimum time-frequency atom being the smallest Given window function/>Time domain duration/>The method comprises the following steps: /(I)，/>Is the center of the time domain and is the center of the time domain,，/>，/>Frequency bandwidth/>Defined in the same manner bySubstitution/>Can be/>, there isIf and only if-Is a Gaussian function/>The equal sign is taken.
2. The method of claim 1, wherein the method further comprises:
presetting a first time domain supporting interval;
According to the first time domain support interval, performing time-frequency optimization on multiple wavelets of a first orthogonal base function and a second orthogonal base function respectively;
Sequentially obtaining a first optimization result and a second optimization result of the time-frequency optimization;
Performing waveform analysis on the first optimization result to obtain a first orthogonal basis function time domain waveform diagram;
performing waveform analysis on the second optimization result to obtain a second orthogonal basis function time domain waveform diagram;
and respectively comparing the first orthogonal base function time domain waveform diagram and the second orthogonal base function time domain waveform diagram with waveform diagrams of preset orthogonal base functions to obtain a first waveform optimization parameter.
3. The method of claim 2, wherein the method further comprises:
performing time-frequency optimization on multiple wavelets of a third orthogonal basis function based on the first time domain support interval;
obtaining a third optimization result of the time-frequency optimization;
Performing waveform analysis on the third optimization result to obtain a third orthogonal basis function time domain waveform diagram;
Performing waveform comparison on the third orthogonal basis function time domain waveform diagram and the waveform diagram of the preset orthogonal basis function to obtain a second waveform optimization parameter;
and optimally designing the first processed waveform according to the first waveform optimization parameter and the second waveform optimization parameter to obtain the new waveform of the orthogonal multi-wavelet packet 5G.
4. The method of claim 1, wherein the superimposing the signal spectrums of the N parallel subcarriers based on the orthogonal frequency division multiplexing technique comprises:
According to ，/>Superposing signal spectrums of the N parallel subcarriers;
Wherein the number of subcarriers R is the multiple wavelet weight, L is the number of layers of decomposition of the multiple wavelet packets, and M is the multiple wavelet time domain support length.
5. The method of claim 2, wherein the performing waveform comparison with the waveform diagram of the preset orthogonal basis function comprises:
Obtaining a first comparison parameter, wherein the first comparison parameter comprises a frequency band utilization rate, a first side lobe power and a peak-to-average ratio;
And respectively comparing the first orthogonal base function time domain waveform diagram and the second orthogonal base function time domain waveform diagram with a waveform diagram of a preset orthogonal base function according to the first comparison parameter.
6. A system for time-frequency optimization design of an orthogonal multi-wavelet packet 5G new waveform, wherein the system comprises:
A first obtaining unit: the first obtaining unit is used for obtaining a first original digital signal;
a first dividing unit: the first dividing unit is used for carrying out parallel division on serial data of the first original digital signal to obtain N parallel sub-signals;
a first mapping unit: the first mapping unit is used for respectively carrying out modulation mapping on the N parallel sub-signals to obtain N parallel sub-carriers;
A first superimposing unit: the first superposition unit is used for performing superposition processing on the signal spectrums of the N parallel subcarriers based on an orthogonal frequency division multiplexing technology to obtain a first processed waveform;
A first design unit: the first design unit is configured to optimally design the multiple wavelet basis functions based on time-frequency optimization, and perform an optimal design on the first processed waveform to obtain a new waveform of an orthogonal multiple wavelet packet 5G, where the optimal design on the first processed waveform is to multiply a duration and a bandwidth Minimum;
a first transmitting unit: the first transmitting unit is used for transmitting the new waveform of the orthogonal multi-wavelet packet 5G based on a wireless signal transmitting channel;
Wherein, the first design unit further includes:
Obtaining a multi-wavelet time domain support length according to the first processed waveform;
Generating the multi-wavelet basis function based on a minimum time-frequency atom, the minimum time-frequency atom being the smallest Setting a window function/>Time domain duration/>The method comprises the following steps: /(I)，/>Is the center of the time domain and is the center of the time domain,，/>，/>Frequency bandwidth/>Defined in the same way, use/>Substitution/>Can be/>, there isIf and only if-Is a Gaussian function/>The equal sign is taken.
7. A system for time-frequency optimisation designing a new waveform for an orthogonal multi-wavelet packet 5G comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the method of any one of claims 1 to 5 when the program is executed by the processor.
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