CN114726492B - Peak-to-average ratio correction method, terminal and storage medium for demodulation reference signal - Google Patents
Peak-to-average ratio correction method, terminal and storage medium for demodulation reference signal Download PDFInfo
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Abstract
The embodiment of the application relates to the technical field of communication of the Internet of things and discloses a peak-to-average ratio correction method, a terminal and a storage medium of demodulation reference signals. The method comprises the following steps: acquiring a first frequency domain sequence based on upper instruction information; performing physical resource mapping on the first frequency domain sequence to obtain a first frequency domain position; acquiring a first time domain signal based on the first frequency domain sequence; calculating a peak-to-average ratio of the first time domain signal based on the first time domain signal; judging whether the peak-to-average ratio of the first time domain signal is smaller than a preset threshold value, if not, processing the first frequency domain sequence based on the first frequency domain position to obtain a second frequency domain sequence; if yes, the first frequency domain sequence is not processed. The peak-to-average ratio correction method for the demodulation reference signal can reduce the peak-to-average ratio of the demodulation reference signal sequence of the uplink of the narrowband system, and solves the problem that the peak-to-average ratio of part of the demodulation reference signal sequence is higher in the uplink multi-carrier transmission scene of the narrowband system at present.
Description
Technical Field
The embodiment of the application relates to the technical field of communication of the Internet of things, in particular to a peak-to-average ratio correction method, a terminal and a storage medium of demodulation reference signals.
Background
As demands for the internet of things increase, a plurality of internet of things communication solutions and standards are presented. The narrowband internet of things (Narrow Band Internet Of Things, NB-IoT) is a cellular-based narrowband internet of things wireless communication standard, and has the characteristics of wide coverage, large connection, low power consumption and low cost. The demodulation reference signal (Demodulation Reference Signal, DMRS) is a demodulation reference signal transmitted when the transmitting end device performs data transmission in the narrowband system, so that the receiving end device performs data demodulation according to the demodulation reference signal DMRS.
The Rel-13 version protocol specifies that the demodulation reference signal DMRS may occupy 1, 3, 6 or 12 subcarriers in the frequency domain. When the number of subcarriers is 12, it is recommended to directly use the demodulation reference signal DMRS sequence of LTE (Long Term Evolution). In the case that the number of subcarriers is 1, 3 or 6, a new demodulation reference signal DMRS sequence needs to be designed. Considering that the network generally schedules uplink multi-carrier transmission under the condition of better coverage, the design of the multi-carrier demodulation reference signal (DMRS) sequence should ensure good cross correlation and enough sequence number, and the demodulation reference signal (DMRS) sequence should have low peak-to-average ratio (Peak to Average Power Ratio, PAPR) on the basis. The Rel-13 version protocol specifies demodulation reference signal DMRS sequences with a number of 12 subcarriers of 3 and a number of 14 subcarriers of 6, wherein the peak-to-average ratio PAPR of a part of the sequences is higher. The higher peak-to-average ratio PAPR makes the linearity requirement of the transmitting end on the power amplifier very high, meaning higher power consumption. In a multi-carrier transmission scene, the advantages of low power consumption and wide coverage of a narrowband system NB-IoT are sacrificed to a certain extent.
Disclosure of Invention
An embodiment of the present application is directed to providing a method, a terminal, and a storage medium for correcting peak-to-average ratio of a demodulation reference signal, which solve the problem that peak-to-average ratio of a part of demodulation reference signal sequences is higher in an uplink multi-carrier transmission scenario of a narrowband system at present.
In order to solve the above technical problems, an embodiment of the present application provides a method for correcting peak-to-average ratio of a demodulation reference signal, including the following steps: acquiring a first frequency domain sequence based on upper instruction information; the first frequency domain sequence is a frequency domain sequence of a demodulation reference signal corresponding to the upper instruction information; performing physical resource mapping on the first frequency domain sequence to obtain a first frequency domain position; the first frequency domain position is the frequency domain position of the first frequency domain sequence in frequency domain resources; acquiring a first time domain signal based on the first frequency domain sequence; the first time domain signal corresponds to the first frequency domain sequence; calculating a peak-to-average ratio of the first time domain signal based on the first time domain signal; judging whether the peak-to-average ratio of the first time domain signal is smaller than a preset threshold value, if not, processing the first frequency domain sequence based on the first frequency domain position to obtain a second frequency domain sequence; the peak-to-average ratio of the time domain signal of the second frequency domain sequence is smaller than a preset threshold value; if yes, the first frequency domain sequence is not processed.
In addition, the frequency domain resource comprises a plurality of subcarriers which are sequentially arranged; dividing the frequency domain resource into a first region and a second region by taking the midpoint of the number of subcarriers as a boundary, wherein the sequence number value of the subcarriers in the first region is smaller than that of the subcarriers in the second region; processing the first frequency domain sequence based on the first frequency domain position to obtain a second frequency domain sequence, including: if the first frequency domain position is located in the first region, adding a random symbol sequence before a first symbol of the first frequency domain sequence, and combining to form a second frequency domain sequence, wherein the second frequency domain sequence is shown in the following formula (1):
F i ＝[P i ，S] (1)
if the first frequency domain position is located in the second region, adding a random symbol sequence before the last symbol of the first frequency domain sequence, and combining to form a second frequency domain sequence, wherein the second frequency domain sequence is shown in the following formula (2):
F i ＝[S，P i ] (2)
wherein F is i For the second frequency domain sequence, P i Is a random symbol sequence, and S is a first frequency domain sequence.
In addition, the random symbol sequence is a set of a plurality of complex symbols; selecting a modulus value and a phase angle value of the complex symbol based on a peak-to-average ratio of the first time domain signal; the random symbol sequence is represented by the following formula (3):
wherein P is i Is a random symbol sequence, A is the modulus value of complex symbol, alpha i And phi i Are phase angle values of complex symbols.
In addition, the modulus and phase angle of the complex symbol satisfy the following formula (4):
wherein A is the modulus of complex symbols, alpha i And phi i Are phase angle values of complex symbols.
In addition, the processing the first frequency domain sequence based on the first frequency domain position to obtain a second frequency domain sequence further includes: acquiring a second time domain signal based on the second frequency domain sequence; the second time domain signal corresponds to the second frequency domain sequence; calculating a peak-to-average ratio of the second time domain signal based on the second time domain signal; and judging whether the peak-to-average ratio of the second time domain signal is smaller than a preset threshold value, if not, continuing to process the first frequency domain sequence until the peak-to-average ratio of the time domain signal of the second frequency domain sequence is smaller than the preset threshold value.
In addition, the processing the first frequency domain sequence based on the first frequency domain position to obtain a second frequency domain sequence further includes: respectively adding different random symbol sequences into the first frequency domain sequences to obtain a plurality of third frequency domain sequences; acquiring a third time domain signal based on the third frequency domain sequence; calculating the peak-to-average ratio of the third time domain signal corresponding to each third frequency domain sequence, and obtaining the minimum peak-to-average ratio; and selecting the third frequency domain sequence corresponding to the minimum peak-to-average ratio as the second frequency domain sequence.
In addition, after the processing the first frequency domain sequence based on the first frequency domain position to obtain a second frequency domain sequence, the method includes: and acquiring a time domain baseband signal based on the second frequency domain sequence.
In addition, the acquiring a first time domain signal based on the first frequency domain sequence includes: and obtaining a first time domain signal by carrying out inverse fast Fourier transform on the first frequency domain sequence.
The embodiment of the application also provides a terminal, which comprises: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the peak-to-average ratio correction method of the demodulation reference signal described above.
Embodiments of the present application also provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described peak-to-average ratio correction method for demodulation reference signals.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the embodiment of the application provides a peak-to-average ratio correction method, a terminal and a storage medium of a demodulation reference signal, wherein the method comprises the steps of firstly obtaining a first frequency domain sequence, and obtaining a first frequency domain position after physical resource mapping is carried out on the first frequency domain sequence; then converting the first frequency domain sequence into a first frequency domain signal, and calculating a peak-to-average ratio; setting a threshold value, judging whether the peak-to-average ratio of a first time domain signal is smaller than a preset threshold value, and if not, processing the first frequency domain sequence based on the first frequency domain position to obtain a second frequency domain sequence; the peak-to-average ratio of the time domain signal of the second frequency domain sequence is smaller than a preset threshold value; if yes, the first frequency domain sequence is not processed.
According to the peak-to-average ratio correction method for the demodulation reference signal, on one hand, according to the frequency domain position of the first frequency domain sequence in the frequency domain resource, the first frequency domain sequence is processed, a random symbol sequence is added in the first frequency domain sequence, and the added random symbol sequence position is located outside the signal bandwidth of the narrow-band system and does not affect the signal quality of the demodulation reference signal; on the other hand, the embodiment of the application flexibly generates the random symbol set meeting the requirements by changing the amplitude and the phase angle of the random symbol and the peak-to-average ratio threshold value of the first time domain signal, thereby fully reducing the peak-to-average ratio of the demodulation reference signal when meeting the related radio frequency index of the narrowband system. In addition, when the peak-to-average ratio of the time domain signal is smaller than the preset threshold value, the time domain sequence is not subjected to the processing of reducing the peak-to-average ratio, so that the processing time and the calculated amount are saved. The random symbol set and the optimal second frequency domain sequence can be generated and configured by offline calculation in advance, and real-time calculation is not needed according to different demodulation reference signal configuration parameters, so that the calculation resources are greatly saved.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings.
Fig. 1 is a flowchart of a method for correcting peak-to-average ratio of a demodulation reference signal according to an embodiment of the present application;
fig. 2 is a flowchart of processing a first frequency domain sequence when a peak-to-average ratio of a first time domain signal is greater than a preset threshold value according to an embodiment of the present application;
fig. 3 is a schematic diagram of a terminal according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, as will be appreciated by those of ordinary skill in the art, in the various embodiments of the present application, numerous technical details have been set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not be construed as limiting the specific implementation of the present application, and the embodiments may be mutually combined and referred to without contradiction.
The narrowband internet of things NB-IoT is a cellular-based internet of things wireless communication standard formulated by the third generation partnership project (3rd Generation Partnership Project,3GPP) and has the characteristics of wide coverage, large connection, low power consumption and low cost. The third generation partnership project 3GPP was cooperated by the global standards organization with the goal of formulating 3G specifications. The 3GPP is based on GSMMAP core network, and uses wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) to make third generation mobile communication standard-universal mobile telephone system (Universul Mobile Telephone System, UMTS) for radio interface, and at the same time is responsible for defining protocol compatible with ANSI-41 core network on radio interface. In order to ensure compatibility between 3G systems designed by various manufacturers and share design resources, a 3GPP standard is established to standardize wideband code division multiple Access WCDMA.
In narrowband internet of things NB-IoT systems, demodulation reference signal DMRS is typically employed for data demodulation. The demodulation reference signal (DMRS) is a transmitted demodulation reference signal when a transmitting end device in a narrowband internet of things (NB-IoT) system performs data transmission, so that a receiving end device performs data demodulation according to the demodulation reference signal (DMRS). In the uplink, the transmitting end device is a terminal device, and the receiving end device is a network device.
In a narrowband internet of things NB-IoT standardization process specified by the LTE Rel-13 version protocol, considering inter-cell interference coordination and frequency domain multiplexing between a single carrier (Narrowband Physical Uplink Shared Channel, NPUSCH) and a multi-carrier NPUSCH, first, the number of subcarriers corresponding to the demodulation reference signal DMRS should be explicitly known to be the same as data, that is, the demodulation reference signal DMRS may occupy 1, 3, 6 or 12 subcarriers in the frequency domain. As known from the background art, the demodulation reference signal DMRS may occupy 1, 3, 6 or 12 subcarriers in the frequency domain, where the peak-to-average ratio PAPR of a part of the demodulation reference signal DMRS sequence is higher. Such as: in a demodulation reference signal (DMRS) sequence with the number of 14 subcarriers being 6, which is specified by a protocol, the peak-to-average ratio (PAPR) of the 0 th, 6 th, 9 th and 11 th demodulation reference signal (DMRS) sequences is higher, and the peak-to-average ratio (PAPR) ensures that the linear requirement of a transmitting end on a power amplifier is higher and the power consumption is higher; therefore, the demodulation reference signal DMRS sequence needs to be subjected to peak-to-average ratio PAPR reduction.
Therefore, in order to reduce the peak-to-average ratio of the uplink demodulation reference signal sequence of the narrowband system and solve the problem that the peak-to-average ratio of part of the demodulation reference signal sequence is higher in the uplink multi-carrier transmission scene of the narrowband system at present, the embodiment of the application provides a method for correcting the peak-to-average ratio of the demodulation reference signal, which comprises the steps of firstly, obtaining a first frequency domain sequence, mapping physical resources of the first frequency domain sequence, and obtaining a first frequency domain position; then converting the first frequency domain sequence into a first frequency domain signal, and calculating a peak-to-average ratio (PAPR); setting a threshold value, and when the peak-to-average ratio (PAPR) of the first frequency domain signal is larger than or equal to the threshold value, carrying out peak-to-average ratio (PAPR) reduction processing on the first frequency domain sequence to enable the PAPR of the first frequency domain signal to be smaller than the threshold value. And when the peak-to-average power ratio (PAPR) of the first frequency domain signal is smaller than a threshold value, the first frequency domain sequence is not processed. The following specifically explains and describes a peak-to-average ratio correction method of a demodulation reference signal according to an embodiment of the present application with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the present application provides a method for correcting peak-to-average ratio of a demodulation reference signal, including the steps of:
step S1, acquiring a first frequency domain sequence based on upper instruction information; the first frequency domain sequence is a frequency domain sequence of a demodulation reference signal corresponding to upper layer instruction information.
S2, performing physical resource mapping on the first frequency domain sequence to obtain a first frequency domain position; the first frequency domain position is a frequency domain position of the first frequency domain sequence in the frequency domain resource.
S3, acquiring a first time domain signal based on the first frequency domain sequence; the first time domain signal corresponds to a first frequency domain sequence.
And S4, calculating the peak-to-average ratio of the first time domain signal based on the first time domain signal.
And S5, judging whether the peak-to-average ratio of the first time domain signal is smaller than a preset threshold value.
If not, go to step S6: processing the first frequency domain sequence based on the first frequency domain position to obtain a second frequency domain sequence; the peak-to-average ratio of the time domain signal of the second frequency domain sequence is smaller than a preset threshold value.
And S7, acquiring a time domain baseband signal based on the second frequency domain sequence.
If yes, the first frequency domain sequence is not processed, and at the moment, the first frequency domain sequence is equal to the second frequency domain sequence, the step S7 is directly carried out, and a time domain baseband signal is obtained based on the second frequency domain sequence.
The peak-to-average ratio PAPR is a measured parameter of a waveform, equal to the square of the amplitude of the waveform divided by the square of the effective value (RMS). The narrowband internet of things NB-IoT system generally employs an orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM), and since the OFDM symbol is formed by superimposing a plurality of independently modulated subcarrier signals, when the phases of the subcarriers are the same or similar, the superimposed signals are modulated by the same initial phase signal, so as to generate a larger instantaneous power peak, thereby further bringing about a higher peak-to-average power ratio, peak-to-average ratio PAPR. The peak-to-average ratio PAPR may be determined according to the equation E { max (y 2 )/E(y 2 ) And performing calculation, wherein y is a waveform signal with multiple carriers superimposed together, and assuming that the number of the carriers is large, the waveform signal can be regarded as a Gaussian signal, and the relation between the peak-to-average ratio (PAPR) and the number of the carriers can be calculated according to a Gaussian distribution function. In OFDM, the peak-to-average ratio maximum of N carriers is N times that of a single carrier.
Four factors influencing the peak-to-average ratio of the narrow-band internet of things (NB-IoT) system are mainly that the peak-to-average ratio of a baseband signal is firstly, and the ringing phenomenon caused by a baseband filter is secondly, namely the peak-to-average ratio caused by overshoot; thirdly, peak-to-average ratio brought by multi-carrier power superposition; fourth, the peak factor (3 dB) brought by the carrier itself. For sine wave, the voltage peak-to-average ratio is 1.414/1, then the power peak-to-average ratio is 2, 10×log2=3 dB. When the peak-to-average ratio PAPR is high, the application efficiency of many radio frequency devices is affected, and therefore, the peak-to-average ratio PAPR processing needs to be performed.
The main functions of the uplink reference signal include uplink and downlink channel measurement, data demodulation and the like. The demodulation reference signal DMRS is used for channel estimation and correlation demodulation of a physical channel, and the demodulation reference signal DMRS is also used for uplink and downlink data demodulation. The design of the reference signal includes a design of random sequence generation and a design of physical resource mapping. Wherein the generation of the random sequence may be directly referenced to the generation of the respective channel reference signal sequences in the standard 3gpp 36.211. The demodulation reference signal DMRS may be mapped to physical channels such as a physical broadcast channel PBCH, a physical downlink control channel PDCCH, a physical downlink shared channel PDSCH, a physical uplink control channel PUCCH, and a physical uplink shared channel PUSCH, and in LTE, we do not need to use the demodulation reference signal DMRS to estimate the physical downlink shared channel PDSCH, because LTE uses CRS signals (cell reference signals) that are always open. In 5G, the 3GPP cancels the CRS signal normally open, and uses the demodulation reference signal DMRS to estimate the physical downlink shared channel PDSCH and the physical uplink shared channel PUSCH. The two channels, namely the physical downlink shared channel PDSCH and the physical uplink shared channel PUSCH, are mapped to specific time-frequency resource positions after modulating bit data into complex constellation diagram symbols. The specific mapping process is to map the RB sub-carriers of the next OFDM symbol after the mapping is completed on the RB sub-carriers of the first frequency domain and the second time domain. The mapping of demodulation reference signals DMRS to physical resources is typically determined according to a higher layer configuration parameter DMRS-Type.
According to the embodiment of the application, firstly, a corresponding frequency domain sequence is generated according to upper instruction information, namely according to an upper control instruction in a communication system; mapping the obtained frequency domain sequence to a specific time-frequency resource position to obtain a frequency domain position corresponding to the frequency domain sequence; then, according to the 3GPP 36.211 protocol, carrying out inverse fast Fourier transform (Inverse Fast Fourier Transform, IFFT) processing on the frequency domain sequence, transforming the frequency domain into the time domain to obtain a time domain signal, and calculating peak-to-average ratio according to the time domain signal; and setting a proper threshold value, and judging whether the peak-to-average ratio of the first time domain signal is smaller than the threshold value. If the peak-to-average ratio of the first time domain signal is not smaller than the threshold value, the first frequency domain sequence is processed until the peak-to-average ratio of the frequency domain sequence is smaller than the threshold value, at this time, the frequency domain sequence is a second frequency domain sequence, and finally, the time domain baseband signal is acquired based on the second frequency domain sequence. If the peak-to-average ratio of the first time domain signal is smaller than the threshold value, the first frequency domain sequence is not processed, namely, the step S5 is directly carried out in the step S7, at this time, the first frequency domain sequence is the second frequency domain sequence, and finally, the time domain baseband signal is obtained based on the second frequency domain sequence.
In some embodiments, the frequency domain resource comprises a plurality of sequentially arranged subcarriers; dividing the frequency domain resource into a first region and a second region by taking the midpoint of the number of the subcarriers as a boundary, wherein the sequence number value of the subcarriers in the first region is smaller than that of the subcarriers in the second region;
referring to fig. 2, processing the first frequency domain sequence based on the first frequency domain position to obtain a second frequency domain sequence includes: if the first frequency domain position is located in the first region, adding a random symbol sequence before the first symbol of the first frequency domain sequence, and combining to form a second frequency domain sequence, wherein the second frequency domain sequence is shown in the following formula (1):
F i ＝[P i ，S] (1)
if the first frequency domain position is located in the second region, adding a random symbol sequence before the last symbol of the first frequency domain sequence, and combining to form a second frequency domain sequence, wherein the second frequency domain sequence is shown in the following formula (2):
F i ＝[S，P i ] (2)
wherein F is i For the second frequency domain sequence, P i Is a random symbol sequence, and S is a first frequency domain sequence.
In some embodiments, the processing of the first frequency-domain sequence is to add a random symbol sequence to the first frequency-domain sequence, where the location of the added random symbol sequence depends on the first frequency-domain location, and the first frequency-domain location is a frequency-domain location in the frequency-domain resource, that is, the first frequency-domain location, of the first frequency-domain sequence obtained in step S2 when the first frequency-domain sequence is mapped to the physical resource. Dividing the frequency domain resource into an upper half part and a lower half part, wherein the upper half part is a subcarrier with the number of 0-5, the lower half part is a subcarrier with the number of 6-11, the number of the subcarrier is the K value of the time-frequency resource, the time-frequency resource K of the upper half part is 0-5, and the time-frequency resource K of the lower half part is 6-11.
If the first frequency domain is located at the upper half part of the frequency domain resource, adding a random symbol sequence before a first symbol of the first frequency domain sequence, and combining to form a second frequency domain sequence; if the first frequency domain position is located at the lower half of the frequency domain resourceAnd adding a random symbol sequence before the last symbol of the first frequency domain sequence, and combining to form a second frequency domain sequence. According to 3GPP 36.211 protocol, frequency domain sequence F i Transformed into a time domain DMRS signal f i Calculating the peak-to-average ratio (PAPR) of the signal, and judging whether the PAPR of the signal is smaller than a preset threshold value T 1 dB, if not, continuing to select the random symbols in the random symbol set to process until the demodulation reference signal DMRS signal f is satisfied i Peak-to-average ratio (PAPR) of (2) is smaller than a preset threshold T 1 dB, a random symbol set can be traversed, and a demodulation reference signal DMRS signal f with the minimum peak-to-average ratio PAPR is selected i 。
In some embodiments, the random symbol sequence is a set of a plurality of complex symbols; selecting a modulus value and a phase angle value of the complex symbol based on a peak-to-average ratio of the first time domain signal; the random symbol sequence is represented by the following formula (3):
wherein P is i Is a random symbol sequence, A is the modulus value of complex symbol, alpha i And phi i Are phase angle values of complex symbols.
Specifically, in step S2, the DMRS sequence of the demodulation reference signal is obtained at a frequency domain resource position, i.e. a first frequency domain position, and if the first frequency domain position is located at the upper half of the narrowband NB-IoT signal bandwidth of the narrowband internet of things, a random symbol P is added before the first symbol of the first frequency domain sequence S i Combining to form a novel sequence F i ＝[P i ,S]. If the first frequency domain sequence is located in the lower half of the narrowband internet of things NB-IoT signal bandwidth, a random symbol P is added before the last symbol of the first frequency domain sequence S i Combining to form a novel sequence F i ＝[S,P i ]。
According to the protocol, the frequency domain sequence F i Transformed into a time domain DMRS signal f i Calculating peak-to-average ratio (PAPR) of the signal, and judging whether the PAPR is smaller than a threshold T 1 dB (dB). Needs to be as followsIllustratively, the threshold value may be preset using a minimum cubic metric, or the threshold T may be obtained by statistical calculation 1 For comparison with the peak-to-average ratio of the first time domain signal for subsequent peak-to-average ratio reduction PAPR processing.
If the peak-to-average power ratio (PAPR) is smaller than the threshold value, directly jumping to the step S7; otherwise, continuing to select the random symbols in the random symbol set to process until the frequency domain signal f is satisfied i Peak-to-average ratio PAPR less than threshold T 1 dB, a random symbol set can be traversed, and a demodulation reference signal DMRS signal f with the minimum peak-to-average ratio PAPR is selected i The corresponding frequency domain sequence is taken as a second frequency domain sequence.
In some embodiments, the modulus and phase angle of the complex symbol satisfy the following equation (4):
wherein A is the modulus of complex symbols, alpha i And phi i Are phase angle values of complex symbols.
Considering the trade-off of algorithm performance and algorithm complexity, through a large number of simulation experiments, the present example adopts the following selection and configuration modes for parameters in the proposed implementation: t=5.5, T 1 =6. For random symbol selection, the embodiment of the application adopts complex symbols with variable modulus and phase angle, namelyIn the proposed method, the set of random symbols satisfies: /> φ i E { -pi, -3 pi, 3 pi }. In practical application, the symbols in the random symbol set are selected in a polling way until the PAPR is smaller than T 1 dB, obtaining a second frequency domain signal according toAnd (5) the protocol is adopted to finish the subsequent baseband signal generation.
According to the method and the device, the frequency domain position of the demodulation reference signal DMRS sequence is judged, and the added random symbol position is located outside the narrow-band internet of things (NB-IoT) signal bandwidth and cannot influence the signal quality of the demodulation reference signal DMRS. When the PAPR is processed, the amplitude and phase angle of the random symbol, and the corresponding PAPR threshold T and T can be changed 1 And flexibly generating a random symbol set meeting the requirements, so that the peak-to-average power ratio (PAPR) of the demodulation reference signal (DMRS) is fully reduced under the conditions of meeting the narrowband internet of things (NB-IoT) related radio frequency indexes, such as ACLR (Adjacent Channel Leakage Ratio) and the like.
In some embodiments, the processing the first frequency domain sequence based on the first frequency domain position to obtain a second frequency domain sequence further includes: acquiring a second time domain signal based on the second frequency domain sequence; the second time domain signal corresponds to the second frequency domain sequence; calculating a peak-to-average ratio of the second time domain signal based on the second time domain signal; and judging whether the peak-to-average ratio of the second time domain signal is smaller than a preset threshold value, if not, continuing to process the first frequency domain sequence until the peak-to-average ratio of the time domain signal of the second frequency domain sequence is smaller than the preset threshold value.
When judging whether the peak-to-average ratio of the second time domain signal is smaller than the preset threshold value, if the peak-to-average ratio PAPR is smaller than the threshold value T 1 dB, the PAPR is not reduced, so that the processing time and the calculated amount are saved. Random symbol set and optimal frequency domain sequence F i The method can be generated and configured by offline calculation in advance, does not need to perform real-time calculation according to different demodulation reference signal (DMRS) configuration parameters, and greatly saves calculation resources.
In some embodiments, the processing the first frequency domain sequence based on the first frequency domain position to obtain a second frequency domain sequence further includes: respectively adding different random symbol sequences into the first frequency domain sequences to obtain a plurality of third frequency domain sequences; acquiring a third time domain signal based on the third frequency domain sequence; calculating the peak-to-average ratio of the third time domain signal corresponding to each third frequency domain sequence, and obtaining the minimum peak-to-average ratio; and selecting the third frequency domain sequence corresponding to the minimum peak-to-average ratio as the second frequency domain sequence.
In some embodiments, the random symbol set may be traversed, and a modulus value and a phase angle value with the smallest peak-to-average ratio PAPR may be selected to obtain a second frequency domain sequence with a peak-to-average ratio smaller than a preset threshold value. Of course, according to the actual requirements and problems, different parameters and random symbol sets can be adopted.
In some embodiments, after the processing the first frequency domain sequence based on the first frequency domain position, obtaining a second frequency domain sequence includes: and acquiring a time domain baseband signal based on the second frequency domain sequence.
After the step S5 or the step S6 is completed, the operation of step S7 is performed, and based on the second frequency domain sequence (DMRS), a subsequent time domain baseband signal is generated according to the protocol.
In some embodiments, the acquiring a first time domain signal based on the first frequency domain sequence includes: and obtaining a first time domain signal by carrying out inverse fast Fourier transform on the first frequency domain sequence.
In some embodiments, the transforming of the frequency domain sequence into the frequency domain signal is accomplished by transforming the frequency domain of the DMRS sequence into the time domain by an inverse fast fourier transform IFFT.
The embodiment of the application provides a peak-to-average ratio correction method of a demodulation reference signal, on one hand, according to the frequency domain position of a first frequency domain sequence in frequency domain resources, the first frequency domain sequence is processed, a random symbol sequence is added in the first frequency domain sequence, and the added random symbol sequence position is positioned outside the signal bandwidth of a narrow-band system and does not influence the signal quality of the demodulation reference signal; on the other hand, the embodiment of the application flexibly generates the random symbol set meeting the requirements by changing the amplitude and the phase angle of the random symbol and the peak-to-average ratio threshold value of the first time domain signal, thereby fully reducing the peak-to-average ratio of the demodulation reference signal when meeting the related radio frequency index of the narrowband system. In addition, when the peak-to-average ratio of the time domain signal is smaller than the preset threshold value, the time domain sequence is not subjected to the processing of reducing the peak-to-average ratio, so that the processing time and the calculated amount are saved. The random symbol set and the optimal second frequency domain sequence can be generated and configured by offline calculation in advance, and real-time calculation is not needed according to different demodulation reference signal configuration parameters, so that the calculation resources are greatly saved.
Referring to fig. 3, another embodiment of the present application further provides a terminal, including: at least one processor 101; and a memory 102 communicatively coupled to the at least one processor 101; wherein the memory 102 stores instructions executable by the at least one processor 101, the instructions being executable by the at least one processor 101 to enable the at least one processor 101 to perform the peak-to-average ratio correction method of the demodulation reference signal.
Where the memory 102 and the processor 101 are connected by a bus, the bus may comprise any number of interconnected buses and bridges, the buses connecting the various circuits of the one or more processors 101 and the memory 102 together. The bus may also connect various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface between the bus and the transceiver. The transceiver may be one element or may be a plurality of elements, such as a plurality of receivers and transmitters, providing a means for communicating with various other apparatus over a transmission medium. The data processed by the processor 101 is transmitted over a wireless medium via an antenna, which further receives the data and transmits the data to the processor 101.
The processor 101 is responsible for managing the bus and general processing and may also provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. And memory 102 may be used to store data used by the processor in performing operations.
Another embodiment of the present application also provides a computer-readable storage medium storing a computer program. The computer program implements the above-described method embodiments when executed by a processor.
That is, it will be understood by those skilled in the art that all or part of the steps in implementing the methods of the embodiments described above may be implemented by a program stored in a storage medium, where the program includes several instructions for causing a device (which may be a single-chip microcomputer, a chip or the like) or a processor (processor) to perform all or part of the steps in the methods of the embodiments described herein. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, etc., which can store program codes.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific embodiments in which the present application is implemented and that various changes in form and details may be made therein without departing from the spirit and scope of the present application.
Claims (9)
1. The peak-to-average ratio correction method of the demodulation reference signal is characterized by comprising the following steps:
acquiring a first frequency domain sequence based on upper instruction information; the first frequency domain sequence is a frequency domain sequence of a demodulation reference signal corresponding to the upper instruction information;
performing physical resource mapping on the first frequency domain sequence to obtain a first frequency domain position; the first frequency domain position is the frequency domain position of the first frequency domain sequence in frequency domain resources;
acquiring a first time domain signal based on the first frequency domain sequence; the first time domain signal corresponds to the first frequency domain sequence;
calculating a peak-to-average ratio of the first time domain signal based on the first time domain signal;
judging whether the peak-to-average ratio of the first time domain signal is smaller than a preset threshold value, if not, processing the first frequency domain sequence based on the first frequency domain position to obtain a second frequency domain sequence; the peak-to-average ratio of the time domain signal of the second frequency domain sequence is smaller than a preset threshold value; if yes, the first frequency domain sequence is not processed;
the frequency domain resource comprises a plurality of subcarriers which are sequentially arranged; dividing the frequency domain resource into a first region and a second region by taking the midpoint of the number of subcarriers as a boundary, wherein the sequence number value of the subcarriers in the first region is smaller than that of the subcarriers in the second region;
processing the first frequency domain sequence based on the first frequency domain position to obtain a second frequency domain sequence, including:
if the first frequency domain position is located in the first region, adding a random symbol sequence before a first symbol of the first frequency domain sequence, and combining to form a second frequency domain sequence, wherein the second frequency domain sequence is shown in the following formula (1):
F i ＝[P i ， S] (1)
if the first frequency domain position is located in the second region, adding a random symbol sequence after the last symbol of the first frequency domain sequence, and combining to form a second frequency domain sequence, wherein the second frequency domain sequence is shown in the following formula (2):
F i ＝[S，P i ] (2)
wherein F is i For the second frequency domain sequence, P i Is a random symbol sequence, and S is a first frequency domain sequence.
2. The method for correcting peak-to-average ratio of demodulation reference signals according to claim 1, wherein the random symbol sequence is a set of a plurality of complex symbols;
selecting a module value and a phase angle value of the complex symbol based on a peak-to-average power ratio (PAPR) of the first time domain signal; the random symbol sequence is represented by the following formula (3):
wherein P is i Is a random symbol sequence, A is the modulus value of complex symbol, alpha i And phi i Are phase angle values of complex symbols.
3. The method of claim 2, wherein the modulus and phase angle of the complex symbols satisfy the following formula (4):
wherein A is the modulus of complex symbols, alpha i And phi i Are phase angle values of complex symbols.
4. The method for correcting peak-to-average ratio of demodulation reference signals according to claim 1, wherein the processing the first frequency domain sequence based on the first frequency domain position to obtain a second frequency domain sequence further comprises:
acquiring a second time domain signal based on the second frequency domain sequence; the second time domain signal corresponds to the second frequency domain sequence;
calculating a peak-to-average ratio of the second time domain signal based on the second time domain signal;
and judging whether the peak-to-average ratio of the second time domain signal is smaller than a preset threshold value, if not, continuing to process the first frequency domain sequence until the peak-to-average ratio of the time domain signal of the second frequency domain sequence is smaller than the preset threshold value.
5. The method for correcting peak-to-average ratio of demodulation reference signals according to claim 1, wherein the processing the first frequency domain sequence based on the first frequency domain position to obtain a second frequency domain sequence further comprises:
respectively adding different random symbol sequences into the first frequency domain sequences to obtain a plurality of third frequency domain sequences;
acquiring a third time domain signal based on the third frequency domain sequence;
calculating the peak-to-average ratio of the third time domain signal corresponding to each third frequency domain sequence, and obtaining the minimum peak-to-average ratio;
and selecting the third frequency domain sequence corresponding to the minimum peak-to-average ratio as the second frequency domain sequence.
6. The method for correcting peak-to-average ratio of demodulation reference signals according to claim 1, wherein after said processing said first frequency domain sequence based on said first frequency domain position to obtain a second frequency domain sequence, comprising:
and acquiring a time domain baseband signal based on the second frequency domain sequence.
7. The method for correcting peak-to-average ratio of demodulation reference signals according to claim 1, wherein the obtaining a first time domain signal based on a first frequency domain sequence comprises:
and obtaining a first time domain signal by carrying out inverse fast Fourier transform on the first frequency domain sequence.
8. A terminal, comprising:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the peak-to-average ratio correction method of the demodulation reference signal of any one of claims 1-7.
9. A computer readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the method for peak-to-average ratio correction of a demodulation reference signal according to any one of claims 1-7.
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