CN112583449A - Method for self-adaptively inhibiting peak-to-average power ratio suitable for medium-voltage carrier system - Google Patents

Method for self-adaptively inhibiting peak-to-average power ratio suitable for medium-voltage carrier system Download PDF

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CN112583449A
CN112583449A CN202011402115.5A CN202011402115A CN112583449A CN 112583449 A CN112583449 A CN 112583449A CN 202011402115 A CN202011402115 A CN 202011402115A CN 112583449 A CN112583449 A CN 112583449A
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frequency domain
domain sequence
peak
rotation
average power
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CN112583449B (en
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徐剑英
李亮
王亚梁
王林涛
李铭贺
于洋
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Qingdao Topscomm Communication Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/542—Systems for transmission via power distribution lines the information being in digital form
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H04L27/262—Reduction thereof by selection of pilot symbols

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Abstract

The invention provides a method for self-adaptively inhibiting peak-to-average power ratio, which is suitable for a medium-voltage carrier system.A pilot frequency of a fixed frequency domain sequence is inserted into a frequency domain sequence of Inverse Fast Fourier Transform (IFFT), and the pilot frequency adopts a code element with the lowest peak-to-average power ratio; then selecting a plurality of orthogonal rotation vectors, and selecting a frequency domain sequence rotated by the rotation vectors to transmit by comparing autocorrelation coefficients in a frequency domain; the receiving end carries out de-rotation operation after receiving the demodulated frequency domain sequence; and finally, judging the correct rotation vector through EVM self-adaptation to perform de-rotation operation. The invention can complete the beneficial effect of inhibiting the peak-to-average power ratio of a plurality of rotation vectors by the self-adaptive de-rotation process without sending sideband information, and simultaneously greatly reduces the calculation complexity by utilizing the self-correlation coefficient and the simplified EVM parameter, and is simple and convenient to implement.

Description

Method for self-adaptively inhibiting peak-to-average power ratio suitable for medium-voltage carrier system
Technical Field
The invention belongs to the technical field of power line communication, and particularly relates to a method for self-adaptively inhibiting peak-to-average power ratio, which is suitable for a medium-voltage carrier system.
Background
The current power line communication field has advanced to a multi-carrier modulation technology, some advantages of OFDM (Orthogonal Frequency Division Multiplexing) are gradually reflected, and a modulation mode of a single carrier is compatible, but OFDM also has a part of technical barriers, such as energy difference of each code element caused by high peak-to-average ratio, thereby causing phenomena such as unstable communication.
In order to inhibit the peak-to-average power ratio problem of OFDM signals, experts in various communication fields start from different angles, and various solutions are proposed, wherein the current mainstream methods include a plurality of methods, one is a predistortion technology, the technology realizes the effect of inhibiting the peak-to-average power ratio by performing operations such as peak clipping, nonlinear change and the like on a transmitting signal, sideband transmission is not needed, the calculated amount is relatively small, but the error rate of a system is influenced by waveform distortion; the other is a coding technology, which needs to select a code element with a lower peak-to-average ratio for transmission through redundant coding, so that the spectrum utilization efficiency is reduced, and when the number of subcarriers is large, the calculation complexity is exponentially multiplied; the other is a probability technology, which also applies more technologies, such as a subcarrier reservation method, a partial transmission sequence method, a selective mapping method and the like, and the technology reduces the peak-to-average ratio by reducing the correlation of the frequency domain sequence, and the technology has two defects, namely high computational complexity; secondly, sideband information transmission can cause great increase of realization difficulty, so that only the problem can be solved, then scrambling technology is selected, scrambling is also one of the methods, transmission of sideband information is not needed, the calculation complexity is not high, but the effect of inhibiting the peak-to-average ratio is not obvious.
Disclosure of Invention
In order to solve the defects or defects of the prior art, the invention provides a method for restraining the peak-to-average power ratio of the self-adaptive judgment of the rotation Vector without sideband transmission, the integral peak-to-average power ratio is distributed in a lower range through the selection of a plurality of orthogonal rotation vectors, the judgment of the peak-to-average power ratio is replaced by an autocorrelation coefficient, the Error rate of the system is avoided being influenced, the complexity of the calculation of the peak-to-average power ratio is greatly reduced, meanwhile, the rotation Vector is self-adaptively judged by a receiving end through an Error Vector Multiplier (EVM), the accurate demodulation can be completed without transmitting sideband information.
In order to achieve the above object, the present invention provides a method for adaptively suppressing peak-to-average power ratio for a medium voltage carrier system, and the technical scheme of the present invention is as follows:
a method for self-adaptive peak-to-average ratio suppression suitable for a medium-voltage carrier system comprises the following steps:
step 1: a message sent by a transmitting end of a carrier machine is subjected to front-end mapping, interleaving and scrambling processing and then is changed into a frequency domain sequence to be subjected to IFFT (Inverse Fast Fourier Transform);
step 2: inserting pilot frequency of a fixed frequency domain sequence, wherein the pilot frequency is arranged in a comb shape, the pilot frequency does not rotate, and the pilot frequency selects a code element with the lowest peak-to-average ratio;
and step 3: selecting a plurality of orthogonal rotation vectors, wherein the rotation vectors have at most one dimension which is less than twice of the dimension of the modulation mode, and the total number of subcarriers on each code element cannot be less than 5;
and 4, step 4: the frequency domain sequence of each code element to be IFFT is respectively point-multiplied with each rotation vector to generate a rotated frequency domain sequence, the autocorrelation coefficient of the rotated frequency domain sequence is calculated, the rotated frequency domain sequence with smaller autocorrelation coefficient is selected to carry out the subsequent IFFT processing to generate time domain data, and the time domain data is sent after the subsequent operations of adding prefix and suffix, windowing and filtering are carried out;
and 5: a receiving end of a carrier machine carries out filtering, prefix and suffix removal, Fast Fourier Transform (FFT) and equalization operation on received time domain data to generate a frequency domain sequence to be de-rotated;
step 6: and carrying out derotation operation on the frequency domain sequence to be derotated, carrying out data normalization EVM calculation on the derotated frequency domain sequence, and adaptively judging a correct derotation result through an EVM coefficient.
2. Further, the rotation vector of step 3 may select a Newman-like rotation vector and a rotation vector orthogonal to the Newman-like rotation vector, which may implement that a symbol with a larger non-rotation peak-to-average ratio is rotated into a symbol with a smaller peak-to-average ratio, and the Newman-like rotation vector may be expressed as follows:
Figure BDA0002817305180000021
where k represents the kth subcarrier and N represents the total number of subcarriers per symbol.
3. Further, the data normalization operation in step 6 is to:
Figure BDA0002817305180000022
wherein
Figure BDA0002817305180000023
For the frequency domain sequence of the pre-de-equalization,
Figure BDA0002817305180000024
for derotating the sequence of frequency domains after the vector, psIs a normalized parameter of the modulation mode.
4. Further, after the frequency domain sequence data after de-rotation is normalized, inverse mapping is performed to obtain an inverse mapped result
Figure BDA0002817305180000025
The simplified EVM can be expressed as:
Figure BDA0002817305180000026
5. further, the rotation vectors of the respective symbols in step 6 are independent, that is, each symbol is required to perform a respective de-rotation process.
The invention has the beneficial effects that: the influence effects of the two rotation vectors on the peak-to-average power ratio are compared by adopting an autocorrelation coefficient, so that IFFT and peak-to-average power ratio calculation with high complexity are replaced, and the calculation difficulty is reduced; the de-rotation operation can be completed in a self-adaptive manner without sending sideband information; the peak-to-average ratio inhibition effect is obvious; the derotation results of the code elements are independent, and the data error of the whole frame caused by the fact that sideband information is not analyzed correctly can be avoided.
Drawings
Fig. 1 is a flowchart of the method for adaptively suppressing the peak-to-average power ratio in the medium voltage carrier system according to the present invention.
Fig. 2 is a distribution diagram of the peak-to-average ratio of the method for adaptively suppressing the peak-to-average ratio in the medium voltage carrier system according to the present invention.
Detailed Description
The technical solution in the embodiments of the present invention is clearly and completely described below with reference to the drawings in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the technical solution of the present invention is:
step 1: the message sent by the transmitting end of the carrier machine is transformed into a frequency domain sequence Y to be IFFT (Inverse Fast Fourier Transform) after being subjected to front-end mapping, interleaving and scrambling processingi(k) I represents the ith symbol, k represents the kth subcarrier, Yi＝[Yi(1)，Yi(2)，...，Yi(N)]TRepresents a frequency-domain sequence of the ith symbol, where'T' represents transposed symbols, the modulation method includes two types of BPSK and QPSK, if BPSK (Binary Phase Shift Keying) modulation is performed, the value of each subcarrier is selected from {1, -1}, if QPSK (Quadrature Phase Shift Keying) modulation is performed, the value of each subcarrier is selected from {1+ j,1-j, -1+ j, -1-j }, and other modulations are also adopted correspondingly;
step 2: inserting pilot frequency of fixed frequency domain sequence, the arrangement mode of pilot frequency is comb-shaped arrangement, the pilot frequency does not rotate, the pilot frequency selects code element with lowest peak-to-average ratio, the invention adopts 20 sub-carriers when implementing specifically, under BPSK modulation mode, the pilot frequency domain sequence selecting lowest peak-to-average ratio is P [, ]-1 1 -1 1 -1 -1 -1 -1 -1 1 1 1 1 -1 -1 1 1 -1 -1 1]T；
And step 3: selecting a plurality of orthogonal rotation vectors, wherein at most one dimension of the rotation vectors is less than two times of the dimension of a modulation mode, such as BPSK, the dimension is 2, and at most one dimension of the rotation vectors is less than 4, in the specific implementation of the invention, two rotation vectors of full 1 rotation vectors and Newman-like rotation vectors are selected, the rotation vectors are phase weighting to each subcarrier, the peak-to-average ratio corresponding to the frequency domain sequence after rotation can be changed, in the specific implementation, the total number of subcarriers on each code element is required to be not less than 5, and the total number of subcarriers on each code element is set to be N, so that the two rotation vectors can be represented as:
T1＝[1，1，...，1]T
Figure BDA0002817305180000031
and 4, step 4: the frequency domain sequence of each code element to be IFFT is point-multiplied by each rotation vector, and the specific implementation is as follows:
Y1 i＝YiT1
Figure BDA0002817305180000032
wherein, Y1 i、
Figure BDA0002817305180000033
Are respectively represented by passing through T1、T2The rotated frequency domain sequence. Then, the autocorrelation coefficient is carried out on the rotated frequency domain sequence
Figure BDA0002817305180000034
Is calculated, i.e.
Figure BDA0002817305180000035
Figure BDA0002817305180000036
Wherein'*' representing conjugate symbols, two rotated frequency domain sequences with smaller autocorrelation coefficients are selected
Figure BDA0002817305180000037
IFFT processing is performed, i.e.
Figure BDA0002817305180000038
Figure BDA0002817305180000039
After the front and back embellishment adding, windowing and filtering operations are subsequently carried out, the OFDM signal is sent;
and 5: the receiving end of the carrier machine carries out filtering, prefix and suffix removal, FFT (Fast Fourier Transform) and equalization operation on the received time domain data to obtain each frequency domain sequence of the receiving end
Figure BDA00028173051800000310
The process is a general process for processing OFDM by a receiving end, namely the inverse process of the processing process of a transmitting end;
step 6: and performing de-rotation operation on the frequency domain sequence to be de-rotated, wherein the de-rotation process is as follows:
Figure BDA0002817305180000041
Figure BDA0002817305180000042
carrying out EVM calculation of data normalization on the frequency domain sequence after de-rotation, wherein the normalization operation is
Figure BDA0002817305180000043
Figure BDA0002817305180000044
Wherein
Figure BDA0002817305180000045
Respectively, the frequency domain sequences after the solution of two kinds of rotation vectors, psThe normalization parameters of BPSK is 1, the normalization parameters of QPSK is 1+1j, the data after normalization is subjected to inverse mapping to obtain the result after inverse mapping
Figure BDA0002817305180000046
Then the EVM can be expressed as
Figure BDA0002817305180000047
Figure BDA0002817305180000048
Since the invention is an EVM that compares two rotation vectors, where the parameter p is normalizedsIs consistent with the number N of subcarriers, so that the EVM expression can be simplified as comparison
Figure BDA0002817305180000049
Figure BDA00028173051800000410
Selecting a smaller EVM inverse mapping result
Figure BDA00028173051800000411
Carry out output, i.e.
Figure BDA00028173051800000412
Figure BDA00028173051800000413
Further, the rotation vectors of the symbols of the present invention are independent, i.e. each symbol is required to perform a respective de-rotation process.
In order to verify the performance of the present invention, the Distribution of the peak-to-average ratio is verified by CCDF (Complementary Cumulative Distribution Function), as shown in fig. 2, 20 subcarriers, BPSK modulation mode, and the Distribution of the peak-to-average ratio is much smaller than the Distribution of the peak-to-average ratio.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and a person of ordinary skill in the art can make modifications or equivalents to the specific embodiments of the present invention with reference to the above embodiments, and such modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims of the present invention as set forth in the claims.

Claims (4)

1. A method for self-adaptively suppressing a peak-to-average power ratio (PAPR) suitable for a medium-voltage carrier system is characterized by comprising the following steps of:
step 1: a message sent by a transmitting end of a carrier machine is subjected to front-end mapping, interleaving and scrambling processing and then is changed into a frequency domain sequence to be subjected to IFFT (Inverse Fast Fourier Transform);
step 2: inserting pilot frequency of a fixed frequency domain sequence, wherein the pilot frequency is arranged in a comb shape, the pilot frequency does not rotate, and the pilot frequency selects a code element with the lowest peak-to-average ratio;
and step 3: selecting a plurality of orthogonal rotation vectors, wherein the dimension of at most one rotation vector is less than the dimension of twice modulation mode, and the total number of subcarriers on each code element cannot be less than 5;
and 4, step 4: the frequency domain sequence of each code element to be IFFT is respectively point-multiplied with each rotation vector to generate a rotated frequency domain sequence, the autocorrelation coefficient of the rotated frequency domain sequence is calculated, the rotated frequency domain sequence with smaller autocorrelation coefficient is selected to carry out the subsequent IFFT processing to generate time domain data, and the time domain data is sent after the subsequent operations of adding prefix and suffix, windowing and filtering are carried out;
and 5: a receiving end of a carrier machine carries out filtering, prefix and suffix removal, Fast Fourier Transform (FFT) and equalization operation on received time domain data to generate a frequency domain sequence to be de-rotated;
step 6: and carrying out derotation operation on the frequency domain sequence to be derotated, carrying out data normalization EVM calculation on the derotated frequency domain sequence, and adaptively judging a correct derotation result through an EVM coefficient to finish the adaptive suppression of the peak-to-average power ratio.
2. The method of claim 1, wherein the data normalization in step 6 is performed by:
Figure FDA0002817305170000011
wherein
Figure FDA0002817305170000012
For the frequency domain sequence of the pre-de-equalization,
Figure FDA0002817305170000013
for derotating the sequence of frequency domains after the vector, psIs a normalized parameter of the modulation mode.
3. The method of claim 3, wherein the de-rotated frequency domain sequence data is normalized and then de-mapped to obtain a de-mapped result
Figure FDA0002817305170000014
The simplified EVM can be expressed as:
Figure FDA0002817305170000015
4. the method of claim 1, wherein the rotation vector of each symbol in step 6 is independent, that is, each symbol is required to perform a respective de-rotation process.
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CN114567531A (en) * 2021-12-02 2022-05-31 青岛鼎信通讯股份有限公司 Genetic annealing peak-to-average ratio inhibition method suitable for medium-voltage carrier system
CN114745243A (en) * 2022-03-31 2022-07-12 青岛鼎信通讯股份有限公司 Artificial bee colony peak-to-average ratio inhibition technology suitable for medium-voltage carrier system

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CN109787931A (en) * 2018-03-20 2019-05-21 中山大学 A kind of ofdm signal peak-to-average ratio reducing method based on improvement artificial bee colony algorithm

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CN106487738A (en) * 2016-09-27 2017-03-08 哈尔滨工程大学 A kind of underwater sound ofdm communication system selected mapping method peak-to-average force ratio Restrainable algorithms based on orthogonal pilot frequency sequence
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CN114567531A (en) * 2021-12-02 2022-05-31 青岛鼎信通讯股份有限公司 Genetic annealing peak-to-average ratio inhibition method suitable for medium-voltage carrier system
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