CN114726492A - Method, terminal and storage medium for correcting peak-to-average ratio of demodulation reference signal - Google Patents
Method, terminal and storage medium for correcting peak-to-average ratio of 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 method for correcting a peak-to-average power ratio of a demodulation reference signal, a terminal and a storage medium. The method comprises the following steps: acquiring a first frequency domain sequence based on upper layer 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 power 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 method for correcting the peak-to-average power ratio of the demodulation reference signal provided by the embodiment of the application can reduce the peak-to-average power ratio of the uplink demodulation reference signal sequence of the narrow-band system and solve the problem that the peak-to-average power ratio of the partial demodulation reference signal sequence in the uplink multi-carrier transmission scene of the narrow-band system is higher 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 method, a terminal and a storage medium for correcting a peak-to-average power ratio of a demodulation reference signal.
Background
With the increasing demand of the internet of things, a plurality of internet of things communication solutions and standards appear. The narrowband 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. A Demodulation Reference Signal (DMRS) is a Demodulation Reference Signal transmitted when a transmitting end device performs data transmission in a narrowband system, so that the receiving end device performs data Demodulation according to the Demodulation Reference Signal DMRS.
The Rel-13 version of the protocol specifies that the demodulation reference signal DMRS may occupy 1, 3, 6, or 12 subcarriers in the frequency domain. When the number of the subcarriers is 12, the DMRS sequence of the LTE (Long Term evolution) demodulation reference signal is recommended to be directly used. And for 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 a network generally schedules uplink multi-carrier transmission under the condition of better coverage, a multi-carrier demodulation reference signal DMRS sequence design should firstly ensure good cross-correlation and enough sequences, and on this basis, a demodulation reference signal DMRS sequence should have a low Peak to Average Power Ratio (PAPR). The Rel-13 version protocol specifies demodulation reference signal DMRS sequences with 12 subcarriers of 3 and 14 subcarriers of 6, wherein the peak-to-average ratio (PAPR) of partial sequences is high. The higher PAPR makes the linearity requirement of the transmitting end to the power amplifier high, which means higher power consumption. Under the 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 object of the embodiments of the present application is to provide a method, a terminal, and a storage medium for correcting a peak-to-average ratio of a demodulation reference signal, which solve the problem that a part of demodulation reference signal sequences has a high peak-to-average ratio in an uplink multi-carrier transmission scenario of a current narrowband system.
In order to solve the above technical problem, an embodiment of the present application provides a method for correcting a peak-to-average power ratio of a demodulation reference signal, including the following steps: acquiring a first frequency domain sequence based on upper layer instruction information; the first frequency domain sequence is a frequency domain sequence of a demodulation reference signal corresponding to the upper layer 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 a 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 power 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; and if so, not processing the first frequency domain sequence.
In addition, the frequency domain resource comprises a plurality of subcarriers which are arranged in sequence; dividing the frequency domain resource into a first region and a second region by taking the middle point 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, as shown in the following formula (1):
Fi＝[Pi，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, as shown in the following formula (2):
Fi＝[S，Pi] (2)
wherein, FiIs a second frequency domain sequence, PiIs 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 module value and a phase angle value of the complex symbol based on the peak-to-average ratio of the first time domain signal; the random symbol sequence is shown in the following formula (3):
wherein, PiFor a random symbol sequence, A is the modulus value of the complex symbol, and α i and φ i are the phase angle values of the complex symbol.
In addition, the modulus and phase angle of the complex symbol satisfy the following formula (4):
where A is the modulus of the complex symbol and α i and φ i are the phase angle values of the complex symbol.
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 second time domain signal 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 in the first frequency domain sequence 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 to obtain the minimum peak-to-average ratio; and selecting the third frequency domain sequence corresponding to the minimum peak-to-average power 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 acquiring a first time domain signal by performing inverse fast Fourier transform on the first frequency domain sequence.
An embodiment of the present application further provides a terminal, including: 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, and the instructions are executed by the at least one processor to enable the at least one processor to execute the method for peak-to-average ratio correction of demodulation reference signals.
An embodiment of the present application further provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the method for peak-to-average ratio correction of demodulation reference signals is implemented.
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 method, a terminal and a storage medium for correcting a peak-to-average power ratio of a demodulation reference signal, wherein the method comprises the steps of firstly obtaining a first frequency domain sequence, mapping physical resources of the first frequency domain sequence, and then 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; setting a threshold value, judging whether the peak-to-average power 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; and if so, not processing the first frequency domain sequence.
On one hand, according to the peak-to-average power ratio correction method for the demodulation reference signal provided by the embodiment of the application, the first frequency domain sequence is processed according to the frequency domain position of the first frequency domain sequence in the frequency domain resource, 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 the narrow-band system, so that the signal quality of the demodulation reference signal cannot be influenced; on the other hand, the amplitude and the phase angle of the random symbol and the peak-to-average ratio threshold value of the first time domain signal are changed, so that a random symbol set meeting requirements is flexibly generated, the related radio frequency indexes of the narrow-band system are met, and the peak-to-average ratio of the demodulation reference signal is fully reduced. 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 processed for 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 off-line calculation in advance, real-time calculation is not needed according to different demodulation reference signal configuration parameters, and calculation resources are greatly saved.
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One or more embodiments are illustrated by the corresponding figures in the drawings, which are not meant to be limiting.
Fig. 1 is a flowchart of a method for correcting a peak-to-average power 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
To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in the examples of the present application, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not constitute any limitation to the specific implementation manner of the present application, and the embodiments may be mutually incorporated and referred to without contradiction.
The narrowband internet of things NB-IoT is a cellular-based wireless communication standard of the internet of things established by the third Generation Partnership Project (3 GPP), and has the characteristics of wide coverage, large connection, low power consumption and low cost. The third generation partnership project 3GPP has been collaborated by the global standards organization with the goal of developing 3G specifications. The 3GPP defines a third-generation Mobile communication standard, i.e., Universal Mobile Telephone System (UMTS), for a wireless interface based on a gsm mac core network and using Wideband Code Division Multiple Access (WCDMA), and is responsible for defining a protocol compatible with an ANSl-41 core network on the wireless interface. In order to ensure compatibility between 3G systems designed by various manufacturers and to share design resources, a 3GPP standard is established to standardize wideband code division multiple access WCDMA.
In a narrowband internet of things NB-IoT system, a demodulation reference signal DMRS is generally used for data demodulation. The demodulation reference signal DMRS is a demodulation reference signal sent by sending end equipment in a narrowband Internet of things NB-IoT system when the sending end equipment carries out data transmission, so that the receiving end equipment carries out data demodulation according to the demodulation reference signal DMRS. In the uplink, the sending 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 (NPUSCH) and a multicarrier NPUSCH, it is first clear that the number of subcarriers corresponding to the demodulation reference signal DMRS should 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 DMRS for demodulation reference signals may occupy 1, 3, 6, or 12 subcarriers in the frequency domain, where the DMRS sequence for demodulation reference signals has a high PAPR. Such as: in 14 demodulation reference signal DMRS sequences with the number of subcarriers being 6, which are specified by a protocol, the DMRS sequences of 0 th, 6 th, 9 th and 11 th demodulation reference signals have high peak-to-average power ratio (PAPR), and the high PAPR causes that a transmitting end has high linear requirement on a power amplifier and higher power consumption; therefore, processing of reducing peak-to-average ratio (PAPR) of a demodulation reference signal (DMRS) sequence is required.
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 the partial demodulation reference signal sequence in the uplink multi-carrier transmission scene of the narrowband system is higher at present, the embodiment of the application provides a method for correcting the peak-to-average ratio of the demodulation reference signal, and the method 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 the PAPR; and setting a threshold value, and when the PAPR of the first frequency domain signal is greater than or equal to the threshold value, performing 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 PAPR of the first frequency domain signal is smaller than a threshold value, the first frequency domain sequence is not processed by the first frequency domain sequence. The method for correcting the peak-to-average power ratio of the demodulation reference signal according to the embodiment of the present application is specifically explained and explained below with reference to the drawings.
Referring to fig. 1, an embodiment of the present application provides a method for correcting a peak-to-average power ratio of a demodulation reference signal, including the following steps:
step S1, acquiring a first frequency domain sequence based on the upper layer instruction information; the first frequency domain sequence is a frequency domain sequence of demodulation reference signals corresponding to upper layer instruction information.
Step S2, performing physical resource mapping on the first frequency domain sequence to obtain a first frequency domain position; the first frequency-domain location is a frequency-domain location of the first frequency-domain sequence in the frequency-domain resources.
Step 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.
Step S4, calculating a peak-to-average ratio of the first time domain signal based on the first time domain signal.
Step S5, determining whether the peak-to-average ratio of the first time domain signal is smaller than a preset threshold.
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; and the peak-to-average ratio of the time domain signal of the second frequency domain sequence is smaller than a preset threshold value.
And step 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 this time, the first frequency domain sequence is equal to the second frequency domain sequence, and the process directly enters step S7, and a time domain baseband signal is obtained based on the second frequency domain sequence.
The PAPR is a measured parameter of a waveform, which is a ratio of 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 (OFDM) technique, and since an OFDM symbol is formed by superimposing a plurality of independently modulated subcarrier signals, when phases of the subcarriers are the same or similar, the superimposed signal is modulated by the same initial phase signal, so as to generate a larger instantaneous power peak, thereby further bringing a higher peak-to-average power ratio, peak-to-average power ratio PAPR for short. The PAPR may be based on the equation E max (y)2)/E(y2) And calculating, wherein y is a waveform signal obtained by superposing multiple carriers, the waveform signal can be regarded as a Gaussian signal if the number of the carriers is large, and the relation between the PAPR (peak-to-average power ratio) 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 are mainly used for influencing the peak-to-average ratio of the narrow-band Internet of things NB-IoT system, namely the peak-to-average ratio of a baseband signal and ringing caused by a baseband filter, namely the peak-to-average ratio caused by overshoot; thirdly, the peak-to-average ratio brought by the multi-carrier power superposition; and fourthly, a peak factor (3dB) brought by the carrier itself. For a sine wave, the voltage peak-to-average ratio is 1.414/1, then the power peak-to-average ratio is 2, 10 log2 is 3 dB. When the PAPR is high, the application efficiency of many rf devices is affected, and therefore, the PAPR needs to be reduced.
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 related demodulation of a physical channel, and is also used for uplink and downlink data demodulation. The design of the reference signal includes design of random sequence generation and design of physical resource mapping. Wherein, the generation part of the random sequence can directly refer to the generation part of the reference signal sequence of each channel 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, the demodulation reference signal DMRS does not need to be used to estimate the physical downlink shared channel PDSCH because LTE uses a CRS signal (cell reference signal) that is always on. In 5G, the 3GPP cancels the CRS signal that is always on, and uses the DMRS to estimate the PDSCH and PUSCH. After modulating bit data into complex constellation symbols, the two channels of the physical downlink shared channel PDSCH and the physical uplink shared channel PUSCH are mapped to specific time frequency resource positions. The specific mapping process is that the frequency domain is firstly mapped and then the time domain is mapped, namely the RB subcarrier of one OFDM symbol is mapped, and then the RB subcarrier of the next OFDM symbol is mapped. The mapping of the demodulation reference signal DMRS to physical resources is typically determined according to a higher layer configuration parameter DMRS-Type.
According to the embodiment of the application, a corresponding frequency domain sequence is generated according to upper layer instruction information, namely according to an upper layer control instruction in a communication system; performing physical resource mapping (time-frequency resource mapping) on the obtained frequency domain sequence, and mapping to a specific time-frequency resource position to obtain a frequency domain position corresponding to the frequency domain sequence; then, according to the specification of 3GPP 36.211, Inverse Fast Fourier Transform (IFFT) processing is performed on the frequency domain sequence, the frequency domain is transformed to the time domain to obtain a time domain signal, and a peak-to-average ratio is calculated 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 moment, the frequency domain sequence is a second frequency domain sequence, and finally, the time domain baseband signal is obtained 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, that is, the step S7 is directly entered from the step S5, 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 middle point 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, as shown in the following formula (1):
Fi＝[Pi，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, as shown in the following formula (2):
Fi＝[S，Pi] (2)
wherein, FiFor the second frequency-domain sequence, PiIs a random symbol sequence and S is a first frequency domain sequence.
In some embodiments, the processing of the first frequency-domain sequence is adding a random symbol sequence within the first frequency-domain sequence, the position of the added random symbol sequence depends on the first frequency-domain position, and the first frequency-domain position is the frequency-domain position of the first frequency-domain sequence in the frequency-domain resources, which is obtained in step S2 when the physical resource mapping is performed on the first frequency-domain sequence, that is, the first frequency-domain position. Dividing the frequency domain resources into an upper half part and a lower half part, wherein the upper half part is numbered 0-5 sub-carriers, the lower half part is numbered 6-11 sub-carriers, the number of the sub-carriers is the K value of the time frequency resources, the time frequency resources K of the upper half part is 0-5, and the time frequency resources K of the lower half part are 6-11.
If the first frequency domain position is positioned at the upper half part of the frequency domain resources, adding a random symbol sequence before a first symbol of the first frequency domain sequence, and combining to form a second frequency domain sequence; and if the first frequency domain position is positioned at the lower half part of the frequency domain resources, 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 the 3GPP 36.211 protocol, the frequency domain sequence FiTransformation to time-domain DMRS signals fiAnd calculating the PAPR of the signal, and judging whether the PAPR of the signal is smaller than a preset threshold value T1dB, if not, continuing to select random symbols in the random symbol set for processing until meeting the demodulation reference signal DMRS signal fiThe peak-to-average power ratio (PAPR) is less than a preset threshold T1dB, the random symbol set can be traversed, and the demodulation reference signal DMRS signal f with the minimum peak-to-average power ratio (PAPR) is selectedi。
In some embodiments, 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 the peak-to-average ratio of the first time domain signal; the random symbol sequence is shown in the following formula (3):
wherein, PiFor a random symbol sequence, A is the modulus value of the complex symbol, and α i and φ i are the phase angle values of the complex symbol.
Specifically, in step S2, a frequency domain resource position of the DMRS sequence of the demodulation reference signal is obtained, that is, a first frequency domain position, and if the first frequency domain position is located at the upper half of the bandwidth of the NB-IoT signal in the narrowband internet of things, a random symbol P is added before a first symbol of the first frequency domain sequence SiCombined to form a new sequence Fi＝[Pi，S]. If the first frequency domain sequence is located in the lower half of the bandwidth of the narrowband internet of things NB-IoT signal, a random symbol P is added before the last symbol of the first frequency domain sequence SiCombined to form a new sequence Fi＝[S，Pi]。
According to the protocol, the frequency domain sequence FiTransformation to time-domain DMRS signals fiAnd calculating the PAPR of the signal, and judging whether the PAPR is smaller than a threshold T1dB. It should be noted that the threshold value may be preset by using a minimum cubic metric, or the threshold T may be obtained by statistical calculation1And the peak-to-average power ratio (PAPR) is compared with the peak-to-average power ratio of the first time domain signal so as to perform subsequent PAPR processing.
If the PAPR is smaller than the threshold value, directly jumping to the step S7; otherwise, continuing to select random symbols in the random symbol set for processing until the frequency domain signal f is satisfiediHas a peak-to-average ratio (PAPR) smaller than a threshold value T1dB, the random symbol set can be traversed, and the demodulation reference signal DMRS signal f with the minimum peak-to-average power ratio (PAPR) is selectediAnd taking the corresponding frequency domain sequence as a second frequency domain sequence.
In some embodiments, the modulus and phase angle of the complex symbol satisfy the following equation (4):
where A is the modulus of the complex symbol and α i and φ i are the phase angle values of the complex symbol.
Considering the compromise between the algorithm performance and the algorithm complexity, through a large number of simulation experiments, the following selection and configuration modes are adopted for the parameters in the proposed implementation scheme in the embodiment: t5.5, T 16. For the selection of random symbols, the embodiments of the present application use complex symbols with variable modulus and phase angle, that is
In the proposed method, the set of random symbols satisfies:
φiis epsilon { -pi, -3 pi, 3 pi }. In practical application, the symbols in the random symbol set are selected in a polling mode until the peak-to-average power ratio (PAPR) is smaller than T1dB, obtaining a second frequency domain signal, and finishing the subsequent generation of the baseband signal according to the protocol.
According to the embodiment of the application, the frequency domain position of the DMRS sequence is judged, and the added random symbol position is positioned outside the bandwidth of the NB-IoT signal of the narrowband Internet of things, so that the signal quality of the DMRS can not be influenced. When the PAPR of the frequency domain sequence is processed, the amplitude and the phase angle of the random symbol, and the corresponding PAPR threshold T and T of the PAPR can be changed1And flexibly generating a random symbol set meeting the requirement, thereby fully reducing the peak-to-average power ratio (PAPR) of the demodulation reference signal (DMRS) under the condition of meeting the related radio frequency indexes of the narrowband Internet of things (NB-IoT), such as ACLR (AdjacentChannel 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 second time domain signal is smaller than the preset threshold value.
When judging whether the peak-to-average power ratio (PAPR) of the second time domain signal is smaller than a preset threshold value, if the PAPR is smaller than the threshold value T1dB, the sequence is not processed for reducing the PAPR, so that the processing time and the calculated amount are saved. Random symbol set and optimal frequency domain sequence FiThe DMRS can be generated and configured by off-line calculation in advance, real-time calculation is not needed according to different DMRS configuration parameters, and calculation resources are greatly saved.
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 in the first frequency domain sequence 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 to obtain the minimum peak-to-average ratio; and selecting the third frequency domain sequence corresponding to the minimum peak-to-average power ratio as the second frequency domain sequence.
In some embodiments, the random symbol set may also be traversed, and a module value and a phase angle value with the minimum peak-to-average ratio PAPR are selected to obtain a second frequency domain sequence with the peak-to-average ratio smaller than a preset threshold. Of course, different parameters and random symbol sets than those above may be used according to actual needs and problems.
In some embodiments, after said processing the first frequency-domain sequence based on the first frequency-domain position into a second frequency-domain sequence, the method further comprises: 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 the step S7 is performed, and a subsequent time-domain baseband signal is generated according to the protocol based on the second frequency-domain sequence (DMRS).
In some embodiments, the obtaining a first time-domain signal based on the first frequency-domain sequence includes: and acquiring a first time domain signal by performing inverse fast Fourier transform on the first frequency domain sequence.
In some embodiments, the transformation of the frequency domain sequence into a frequency domain signal is done 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 method for correcting a peak-to-average power ratio of a demodulation reference signal, on one hand, a first frequency domain sequence is processed according to the frequency domain position of the first frequency domain sequence in frequency domain resources, a random symbol sequence is added in the first frequency domain sequence, and the position of the added random symbol sequence is positioned outside the signal bandwidth of a narrow-band system, so that the signal quality of the demodulation reference signal cannot be influenced; on the other hand, the amplitude and the phase angle of the random symbol and the peak-to-average ratio threshold value of the first time domain signal are changed, so that a random symbol set meeting requirements is flexibly generated, the related radio frequency indexes of the narrow-band system are met, and the peak-to-average ratio of the demodulation reference signal is fully reduced. 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 processed for 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 off-line calculation in advance, real-time calculation is not needed according to different demodulation reference signal configuration parameters, and 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; the memory 102 stores instructions executable by the at least one processor 101, and the instructions are executed by the at least one processor 101, so that the at least one processor 101 can execute the above method for peak-to-average ratio correction of demodulation reference signals.
Where the memory 102 and processor 101 are coupled by a bus, the bus may comprise any number of interconnected buses and bridges that couple one or more of the various circuits of the processor 101 and memory 102 together. The bus may also connect various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface provides an interface between the bus and the transceiver. The transceiver may be one element or 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 through 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. While 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 realizes the above-described method embodiments when executed by a processor.
That is, as can be understood by those skilled in the art, all or part of the steps in the method for implementing the embodiments described above may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the present application, and that various changes in form and details may be made therein without departing from the spirit and scope of the present application in practice.
Claims (10)
1. A method for correcting a peak-to-average power ratio of a demodulation reference signal is characterized by comprising the following steps:
acquiring a first frequency domain sequence based on upper layer instruction information; the first frequency domain sequence is a frequency domain sequence of a demodulation reference signal corresponding to the upper layer 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 a 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 power 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; and if so, not processing the first frequency domain sequence.
2. The method according to claim 1, wherein the frequency domain resource comprises a plurality of subcarriers arranged in sequence; dividing the frequency domain resource into a first region and a second region by taking the middle point 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, as shown in the following formula (1):
Fi＝[Pi，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, as shown in the following equation (2):
Fi＝[S，Pi] (2)
wherein, FiFor the second frequency-domain sequence, PiIs a random symbol sequence and S is a first frequency domain sequence.
3. The method according to claim 2, 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 the PAPR of the first time domain signal; the random symbol sequence is shown in the following formula (3):
wherein, PiFor a random symbol sequence, A is the modulus value of the complex symbol, and α i and φ i are the phase angle values of the complex symbol.
4. The method according to claim 3, wherein the modulus and the phase angle of the complex symbol satisfy the following formula (4):
where A is the modulus of the complex symbol and α i and φ i are the phase angle values of the complex symbol.
5. The method according to claim 2, 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 second time domain signal is smaller than the preset threshold value.
6. The method according to claim 2, 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 in the first frequency domain sequence 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 to obtain the minimum peak-to-average ratio;
and selecting the third frequency domain sequence corresponding to the minimum peak-to-average power ratio as the second frequency domain sequence.
7. The method according to claim 1, wherein after the processing the first frequency-domain sequence based on the first frequency-domain position to obtain a second frequency-domain sequence, the method comprises:
and acquiring a time domain baseband signal based on the second frequency domain sequence.
8. The method according to claim 1, wherein the obtaining the first time domain signal based on the first frequency domain sequence comprises:
and acquiring a first time domain signal by performing inverse fast Fourier transform on the first frequency domain sequence.
9. A terminal, comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of peak-to-average ratio correction of demodulation reference signals according to any of claims 1-8.
10. A computer-readable storage medium storing a computer program, wherein the computer program is executed by a processor to implement the method for peak-to-average ratio correction of demodulation reference signals according to any one of claims 1 to 8.
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