CN109039380B - Power line communication system and phase deviation method, device and equipment thereof - Google Patents
Power line communication system and phase deviation method, device and equipment thereof Download PDFInfo
- Publication number
- CN109039380B CN109039380B CN201810966038.2A CN201810966038A CN109039380B CN 109039380 B CN109039380 B CN 109039380B CN 201810966038 A CN201810966038 A CN 201810966038A CN 109039380 B CN109039380 B CN 109039380B
- Authority
- CN
- China
- Prior art keywords
- signal
- phase offset
- phase
- subcarriers
- group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- H04L27/2621—Reduction thereof using phase offsets between subcarriers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention discloses a phase shift method applied to a power line communication system, which comprises the steps of dividing a signal to be transmitted into signal sections of a first preset value group, wherein the number of subcarriers in each group of signal sections is not more than a second preset value; traversing and calculating the PAPR of all phase shift combined sections of the subcarriers in each group of signal sections; combining the phase offset combination sections with the lowest PAPR in each group of signal sections into a complete phase offset combination according to the original sequence of the subcarriers; and performing phase offset on a plurality of subcarriers in the signal to be transmitted according to the phase offset combination. The invention can successfully complete the calculation of PAPR with huge quantity, reduces the PAPR of the signal to be transmitted, and also reduces the cost and bit error rate of the power line communication system. The invention also discloses a power line communication system and a phase deviation device and equipment thereof, which have the same beneficial effects as the phase deviation method.
Description
Technical Field
The invention relates to the field of power line communication, in particular to a phase shift method applied to a power line communication system, and also relates to the power line communication system, a phase shift device and equipment thereof.
Background
The powerline communication system is a communication system that performs data transmission using an existing powerline network system, and the homeplug standard specifies that an OFDM (Orthogonal Frequency Division Multiplexing) technology is used when the powerline communication system transmits data, and the OFDM technology has a disadvantage that a PAPR (Peak-to-average Power Ratio) of a signal is high. The reason for the high PAPR can be summarized simply as that a plurality of subcarriers in the signal have the same phase when they arrive at the receiving end, and therefore an instantaneous power offset much higher than the average signal power level may be generated, resulting in a high PAPR.
The homeplug standard provides reference values of phase offsets for different subcarriers, and a user can offset the phase of each subcarrier according to the reference values to achieve the purpose of reducing the PAPR, but for the subcarriers, the PAPRs corresponding to different phase offset combinations are different, the reference values of the phase offsets provided by the homeplug standard have a common effect of reducing the PAPR, and still require that nonlinear devices such as a power amplifier and the like have a larger linear range, the cost is higher, and the higher PAPR enables the bit error rate of a power line communication system to be higher.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a phase offset method applied to a power line communication system, which reduces the PAPR of a signal to be transmitted and reduces the cost and bit error rate of the power line communication system; another object of the present invention is to provide a power line communication system, and a phase shifting apparatus and device thereof, which can reduce PAPR of a signal to be transmitted, and reduce cost and bit error rate of the power line communication system.
In order to solve the above technical problem, the present invention provides a phase shifting method applied to a power line communication system, including:
dividing a signal to be transmitted into signal sections of a first preset value group, wherein the number of subcarriers in each signal section is not more than a second preset value;
traversing and calculating the PAPR of all the phase shift combined sections of the subcarriers in each group of the signal sections;
combining the phase offset combination sections with the lowest PAPR in each group of signal sections into a complete phase offset combination according to the original sequence of the subcarriers;
and carrying out phase offset on a plurality of subcarriers in the signal to be transmitted according to the phase offset combination.
Preferably, after combining the phase offset combination segments with the lowest PAPR in each group of the signal segments into a complete phase offset combination according to the original order of the subcarriers, and before performing phase offset on the subcarriers in the signal to be transmitted according to the phase offset combination, the phase offset method further includes:
combining the phase offset combination sections with the same reciprocal order of PAPRs in each group of signal sections into a complete phase offset combination according to the original sequence of the subcarriers, wherein the phase offset combination section with the first reciprocal order is ignored;
calculating the PAPR of each group of the phase offset combinations;
selecting the phase offset combination with the lowest PAPR as an optimal phase offset combination;
the phase shifting the plurality of subcarriers in the signal to be transmitted according to the phase shift combination specifically includes:
and carrying out phase offset on a plurality of subcarriers in the signal to be transmitted according to the optimal phase offset combination.
Preferably, the dividing the signal to be transmitted into signal segments of a first preset number group, where the number of subcarriers in each signal segment is not greater than a second preset number specifically is:
the method comprises the steps of dividing a signal to be transmitted into signal sections of a first preset value group, wherein the number of subcarriers in each signal section is a second preset value, copying a third preset value subcarrier from the front end of the signal to be transmitted in advance and supplementing the third preset value subcarrier to the tail end of the signal to be transmitted when the signal to be transmitted cannot be divided evenly, so that the signal to be transmitted can be divided evenly.
Preferably, after calculating the PAPR of each group of the phase offset combinations, and before selecting the phase offset combination with the lowest PAPR as the optimal phase offset combination, the phase offset method further comprises:
calculating a power peak for each set of the phase offset combinations of the combinations;
performing weighted calculation on the PAPR and the power peak value of each group of the phase offset combinations according to preset weights to obtain weighted values of each group of the phase offset combinations;
the specific step of selecting the phase offset combination with the lowest PAPR as the optimal phase offset combination is as follows:
selecting the phase offset combination with the lowest weighted value as the optimal phase offset combination.
Preferably, the third predetermined value is smaller than the second predetermined value.
Preferably, the preset weight of the PAPR and the preset weight of the power peak are both 0.5.
Preferably, the second preset value is 7.
In order to solve the above technical problem, the present invention further provides a phase shift device applied to a power line communication system, including:
the device comprises a grouping module, a receiving module and a transmitting module, wherein the grouping module is used for dividing signals to be transmitted into signal sections of a first preset value group, and the number of subcarriers in each group of signal sections is not more than a second preset value;
the calculation module is used for traversing and calculating the PAPR of all the phase offset combined sections of the subcarriers in each group of the signal sections;
the combination module is used for combining the phase offset combination sections with the lowest PAPR in each group of signal sections into a complete phase offset combination according to the original sequence of the subcarriers;
and the execution module is used for carrying out phase offset on the plurality of subcarriers in the signal to be transmitted according to the phase offset combination.
In order to solve the above technical problem, the present invention further provides a phase shift device applied to a power line communication system, including:
a memory for storing a computer program;
a processor for implementing the steps of the phase shifting method as claimed in any one of the above when executing the computer program.
In order to solve the above technical problem, the present invention further provides a power line communication system including the phase shift device applied to the power line communication system as described above.
The invention provides a phase shift method applied to a power line communication system, which comprises the steps of dividing a signal to be transmitted into signal sections of a first preset value group, wherein the number of subcarriers in each group of signal sections is not more than a second preset value; traversing and calculating the PAPR of all phase shift combined sections of the subcarriers in each group of signal sections; combining the phase offset combination sections with the lowest PAPR in each group of signal sections into a complete phase offset combination according to the original sequence of the subcarriers; and performing phase offset on a plurality of subcarriers in the signal to be transmitted according to the phase offset combination.
It can be seen that, in the present invention, the signal to be transmitted can be firstly divided into signal segments of a first preset number group, the PAPR of all phase offset combination segments of subcarriers in each group of signal segments is calculated, then the phase offset combination segments with the lowest PAPR in each group of signal segments are combined into a complete phase offset combination according to the original sequence of subcarriers, and finally the phase offsets of a plurality of subcarriers in the signal to be transmitted are performed according to the phase offset combination, the present invention can limit the number of subcarriers in each group of signal segments within a second preset number, successfully complete the calculation of huge PAPR, the complete phase offset combination reassembled by the phase offset combination segments with the lowest PAPR in each signal segment, the PAPR of the phase offset combination is also lower, the PAPR of the signal to be transmitted is reduced, and the requirement for the linear range of the nonlinear device in the power line communication system is reduced, the cost is reduced, and the bit error rate of the power line communication system is reduced.
The invention also provides a power line communication system and a phase deviation device and equipment thereof, which have the same beneficial effects as the phase deviation method.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic flowchart of a phase shifting method applied to a power line communication system according to the present invention;
fig. 2 is a schematic structural diagram of a phase shifting apparatus applied to a power line communication system according to the present invention;
fig. 3 is a schematic structural diagram of a phase shifting apparatus applied to a power line communication system according to the present invention.
Detailed Description
The core of the invention is to provide a phase offset method applied to a power line communication system, which reduces the PAPR of a signal to be transmitted and reduces the cost and bit error rate of the power line communication system; another core of the present invention is to provide a power line communication system, and a phase shifting apparatus and device thereof, which reduce the PAPR of the signal to be transmitted, and reduce the cost and bit error rate of the power line communication system.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, 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.
Referring to fig. 1, fig. 1 is a schematic flow chart of a phase shifting method applied to a power line communication system according to the present invention, including:
step S1: dividing a signal to be transmitted into signal sections of a first preset value group, wherein the number of subcarriers in each group of signal sections is not more than a second preset value;
specifically, for each subcarrier, there are eight possibilities of 0-7 (wherein the specific phase shift is obtained by multiplying the phase shift value from 0-7 by the value of the phase shift value from 0-7)
The number of sub-carriers in each group of signal segments is not greater than a second predetermined value, thereby ensuring that the probability of phase shifting the combined segment in each group of signal segments is at most 8MWhere M is a second predetermined value, i.e. for each group of signal segments, at most only 8 operations need to be carried outMAnd the secondary calculation can ensure that the calculation of the PAPR of each group is smoothly carried out by controlling a second preset value.
Specifically, the number of subcarriers in the signal to be transmitted may be multiple types, for example, 437 subcarriers are commonly used in communication, and of course, other numbers may be selected according to different requirements, for example, 7 or 510 subcarriers may be selected, and the embodiment of the present invention is not limited herein.
Specifically, the number of subcarriers in each group of signal segments is not limited, as long as the number of subcarriers in each group of signal segments is not greater than a second preset value.
The first preset value represents the number of the signal segments, and is not particularly limited as long as the number of the subcarriers in each group of signal segments is not greater than the second preset value, and on the basis of meeting the condition, the specific value of the first preset value can be freely set, and even can be set to 1 or two end values of the total number of the subcarriers in the signal to be transmitted.
Step S2: traversing and calculating the PAPR of all phase shift combined sections of the subcarriers in each group of signal sections;
specifically, the number of all phase shift combination segments of the subcarriers in each group of signal segments may be various, and may be 8, for exampleMWherein, the value 8 represents the number of phase shift modes of each subcarrier, which is determined according to the preset minimum shift unit of the phase shift, when the minimum shift unit is
In this case, there are 8 phase offset manners for each subcarrier, and the minimum offset unit of the subcarrier may also be set to another value.
There may be many ways to calculate the PAPR of the phase offset combining segment, and the embodiment of the present invention is not limited herein.
The traversal function can be realized in a function nesting mode and is obtained in a function recursion mode.
Step S3: combining the phase offset combination sections with the lowest PAPR in each group of signal sections into a complete phase offset combination according to the original sequence of the subcarriers;
specifically, since the method of truncation grouping is adopted when the signal to be transmitted is divided into the signal segments of the first preset value group, the original sequence of the subcarriers is used for combination when all the signal segments are recombined into the complete phase offset combination, and then the subsequent steps are performed.
Step S4: and performing phase offset on a plurality of subcarriers in the signal to be transmitted according to the phase offset combination.
In view of the technical problems in the background art, in the embodiment of the present invention, the phase offset combining segment with the lowest PAPR in each group of signal segments can be combined into a complete phase offset combination according to the original sequence of subcarriers, and the phase offset is performed on the signal to be transmitted according to the complete phase offset combination.
The invention provides a phase shift method applied to a power line communication system, which comprises the steps of dividing a signal to be transmitted into signal sections of a first preset value group, wherein the number of subcarriers in each group of signal sections is not more than a second preset value; traversing and calculating the PAPR of all phase shift combined sections of the subcarriers in each group of signal sections; combining the phase offset combination sections with the lowest PAPR in each group of signal sections into a complete phase offset combination according to the original sequence of the subcarriers; and performing phase offset on a plurality of subcarriers in the signal to be transmitted according to the phase offset combination.
It can be seen that, in the present invention, the signal to be transmitted can be firstly divided into signal segments of a first preset number group, the PAPR of all phase offset combination segments of subcarriers in each group of signal segments is calculated, then the phase offset combination segments with the lowest PAPR in each group of signal segments are combined into a complete phase offset combination according to the original sequence of subcarriers, and finally the phase offsets of a plurality of subcarriers in the signal to be transmitted are performed according to the phase offset combination, the present invention can limit the number of subcarriers in each group of signal segments within a second preset number, successfully complete the calculation of huge PAPR, the complete phase offset combination reassembled by the phase offset combination segments with the lowest PAPR in each signal segment, the PAPR of the phase offset combination is also lower, the PAPR of the signal to be transmitted is reduced, and the requirement for the linear range of the nonlinear device in the power line communication system is reduced, the cost is reduced, and the bit error rate of the power line communication system is reduced.
On the basis of the above-described embodiment:
as a preferred embodiment, after combining the phase offset combination segments with the lowest PAPR in each group of signal segments into a complete phase offset combination according to the original order of subcarriers, and before performing phase offset on a plurality of subcarriers in a signal to be transmitted according to the phase offset combination, the phase offset method further includes:
combining the phase offset combined sections with the same reciprocal order of the PAPR in each group of signal sections into a complete phase offset combination according to the original order of the subcarriers, wherein the phase offset combined section with the first reciprocal order is ignored;
specifically, the phase offset combining segments in the first order from the last have been combined in the previous step, so that repeated combination is not required in this step, and in the embodiment of the present invention, only the phase offset combining segments with the same PAPR as the last order need to be combined into a complete phase offset combination according to the original order of the subcarriers, for example, the phase offset combining segments in each group with PAPR sorted to the second from the last are combined into a complete phase offset combination, the phase offset combining segments in each group with PAPR sorted to the third from the last are combined into a complete phase offset combination, and the like, which is not limited herein.
The number of the complete phase offset combinations finally combined may be determined by the number of subcarriers of the signal segment with the largest number of subcarriers, for example, when the number of subcarriers of the signal segment with the largest number of subcarriers is a second preset value, phase offset combinations with the second preset value may be combined, and if the number of phase offset combination segments in a certain signal segment is not enough when combining, the phase offset combination segment with the lowest PAPR in the signal segment may be used as a supplement.
Calculating the PAPR of each group of phase offset combination;
selecting a phase offset combination with the lowest PAPR as an optimal phase offset combination;
specifically, in the embodiment of the present invention, the PAPR of each group of phase offset combinations that are combined may be calculated to determine more possibilities, and a phase offset combination with a lower PAPR is sought, so as to achieve the purpose of reducing the PAPR of the signal to be transmitted to a greater extent.
Wherein, the maximum number of phase shift combination can be controlled at 8MTherefore, the calculation can be smoothly carried out.
Then, the phase shifting performed on the multiple subcarriers in the signal to be transmitted according to the phase shift combination specifically includes:
and performing phase offset on a plurality of subcarriers in the signal to be transmitted according to the optimal phase offset combination.
Specifically, the optimal phase offset combination obtained by comparing the PAPRs of the plurality of phase offset combinations has a lower PAPR, which can further reduce the PAPR of the signal to be transmitted.
As a preferred embodiment, dividing the signal to be transmitted into signal segments of a first preset number group, where the number of subcarriers in each group of signal segments is not greater than a second preset number specifically is:
and when the signals to be transmitted cannot be equalized, copying subcarriers with a third preset value from the front end of the signals to be transmitted in advance and supplementing the subcarriers to the tail end of the signals to be transmitted so that the signals to be transmitted can be equalized.
Specifically, the signal to be transmitted is equally divided into the signal sections of the first preset value group, the number of subcarriers in each group of signal sections is the second preset value, the first preset value can reach the minimum value under the condition that the second preset value is stipulated, the number of subcarriers in each group is the same, the calculation process is simplified, the calculation speed is improved, the number of subcarriers in each signal section is the maximum, the PAPR of the longer signal section can be calculated and then combined, and the PAPR of the signal to be transmitted is favorably further reduced.
In the embodiment of the present invention, the first preset value, the second preset value and the third preset value may be positive integers.
Of course, in addition to the setting manner of the first preset value and the second preset value, the first preset value and the second preset value may be set in other forms, and the embodiment of the invention is not limited herein.
As a preferred embodiment, after calculating the PAPR of each group of phase offset combinations of the combinations, before selecting the phase offset combination with the lowest PAPR as the optimal phase offset combination, the phase offset method further includes:
calculating the power peak value of each group of phase shift combination;
specifically, considering that the higher the power peak value is, the higher the requirements on devices such as a power amplifier are, the cost is increased, and the service life of the devices may be reduced, in the embodiment of the present invention, the power peak value of each group of phase offset combinations that are combined may be calculated, and then added to the reference quantity for selecting the phase offset combination in the subsequent step, so that the final phase offset combination is more reasonable, and the cost is further reduced.
Carrying out weighted calculation on the PAPR and the power peak value of each group of phase offset combinations according to preset weights to obtain weighted values of each group of phase offset combinations;
selecting the phase offset combination with the lowest PAPR as the optimal phase offset combination specifically includes:
and selecting the phase offset combination with the lowest weighted value as the optimal phase offset combination.
Referring to table 1 below, table 1 calculates the corresponding minimum PAPR when the second predetermined value (M) is a value from 1 to 7 according to the embodiment of the present invention.
TABLE 1
It can be seen that except that M is 3 or 4, when the value of M is larger, the PAPR of the corresponding phase offset combination is calculated to be smaller, and when M is 7, the corresponding minimum PAPR is 0.1072, so that the PAPR is minimized.
Specifically, the embodiment of the present invention may perform weighted calculation on the PAPR and the power peak value of each group of phase offset combinations, calculate the weighted value, and comprehensively refer to two factors, i.e., the PAPR and the power peak value, where the PAPR can ensure that the power fluctuates around the mean value, and the power peak value is taken as a reference, so that the highest power value of the signal to be transmitted can be reduced, thereby further reducing the requirements on related devices in the system and reducing the cost.
Of course, in addition to adding the power peak value to the reference quantity and calculating the weighted value of the PAPR and the power peak value, other reference quantities may be added for weighting, and the embodiment of the present invention is not limited herein.
In a preferred embodiment, the third predetermined value is smaller than the second predetermined value.
Specifically, it is specified that the third preset value is smaller than the second preset value to represent that: when the number of the subcarriers in each group of signal segments is a second preset value and the signals to be transmitted cannot be equally divided, the least number of subcarriers can be taken from the front end of the signals to be transmitted to supplement the subcarriers to the tail end of the signals to be transmitted and then the subcarriers are equally divided, so that the calculation amount can be reduced.
Of course, in addition to this complementary manner, N second preset values may be added to the third preset value on the basis of this complementary manner, that is, N second preset values may be copied from the front end of the signal to be transmitted and the subcarriers added with the third preset value may be supplemented to the tail end of the signal to be transmitted.
As a preferred embodiment, the preset weight of the PAPR and the preset weight of the power peak are both 0.5.
Specifically, considering that the PAPR and the peak power value have the same important role on the signal to be transmitted, the weight average of the two preset weights is set to 0.5 in the embodiment of the present invention, and the influence of the two reference amounts can be considered in a balanced manner, so that the signal to be transmitted has a smaller requirement on each device in the system, and the loss of the device is also smaller, thereby further prolonging the service life.
Of course, besides setting both weights to 0.5, the weights of both may also be set to other values, for example, PAPR is 0.6, power peak value is 0.4, etc., and the embodiment of the present invention is not limited herein.
As a preferred embodiment, the second predetermined value is 7.
Specifically, the second preset value is 7, so that the number of subcarriers in each group of signal segments is not greater than 7, and in this case, the maximum number of phase shift combination segments in each group of signal segments is 87The MATLAB can smoothly operate on each group of signal segments, and the combination of complete phase offsets combined in the subsequent steps can not exceed 87The calculation in the whole process can be smoothly completed to obtain the final phase offset combination, and the effect of reducing the PAPR of the signal to be transmitted is achieved.
Wherein, in the process of MATLAB simulation, when the maximum number of calculation exceeds 87Situations may arise where the program directly decides infinity.
Of course, in addition to setting the second preset value to 7, the second preset value may also be other values, such as any one of values 1 to 6, and may even be greater than 7, and the embodiment of the present invention is not limited herein.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a phase shifting apparatus applied to a power line communication system according to the present invention, including:
the grouping module 1 is used for dividing the signals to be transmitted into signal sections of a first preset value group, wherein the number of subcarriers in each group of signal sections is not more than a second preset value;
the calculating module 2 is used for traversing and calculating the peak-to-average power ratio (PAPR) of all the phase shift combined sections of the subcarriers in each group of signal sections;
the combination module 3 is used for combining the phase offset combination sections with the lowest PAPR in each group of signal sections into a complete phase offset combination according to the original sequence of the subcarriers;
and the execution module 4 is configured to perform phase offset on multiple subcarriers in the signal to be transmitted according to the phase offset combination.
For the description of the phase shifting apparatus applied to the power line communication system according to the embodiment of the present invention, please refer to the embodiment of the phase shifting method, which is not described herein again.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a phase shifting apparatus applied to a power line communication system according to the present invention, including:
a memory 5 for storing a computer program;
a processor 6 for implementing the steps of the phase shifting method as described in any one of the above when executing a computer program.
For the description of the phase shifting apparatus applied to the power line communication system according to the embodiment of the present invention, please refer to the embodiment of the phase shifting method, which is not described herein again.
The invention also provides a power line communication system, which comprises the phase shifting device applied to the power line communication system in the embodiment.
For the introduction of the power line communication system provided by the embodiment of the present invention, please refer to the embodiment of the phase shifting method, which is not described herein again.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A phase shifting method applied to a power line communication system, comprising:
dividing a signal to be transmitted into signal sections of a first preset value group, wherein the number of subcarriers in each signal section is not more than a second preset value;
traversing and calculating the PAPR of all the phase shift combined sections of the subcarriers in each group of the signal sections;
combining the phase offset combination sections with the lowest PAPR in each group of signal sections into a complete phase offset combination according to the original sequence of the subcarriers;
performing phase offset on a plurality of subcarriers in the signal to be transmitted according to the phase offset combination;
wherein, the phase shift method further comprises:
combining the phase offset combination sections with the same reciprocal order of PAPRs in each group of signal sections into a complete phase offset combination according to the original sequence of the subcarriers, wherein the phase offset combination section with the first reciprocal order is ignored;
calculating the PAPR of each group of the phase offset combinations;
selecting the phase offset combination with the lowest PAPR as an optimal phase offset combination;
the phase shifting the plurality of subcarriers in the signal to be transmitted according to the phase shift combination specifically includes:
and carrying out phase offset on a plurality of subcarriers in the signal to be transmitted according to the optimal phase offset combination.
2. The phase shifting method according to claim 1, wherein the dividing the signal to be transmitted into signal segments of a first predetermined number of groups, the number of subcarriers in each group of signal segments being not greater than a second predetermined number is specifically:
the method comprises the steps of dividing a signal to be transmitted into signal sections of a first preset value group, wherein the number of subcarriers in each signal section is a second preset value, copying a third preset value subcarrier from the front end of the signal to be transmitted in advance and supplementing the third preset value subcarrier to the tail end of the signal to be transmitted when the signal to be transmitted cannot be divided evenly, so that the signal to be transmitted can be divided evenly.
3. The phase shifting method according to claim 2, wherein after calculating the PAPR of each of the phase shift combinations, and before selecting the phase shift combination with the lowest PAPR as the optimal phase shift combination, the phase shifting method further comprises:
calculating a power peak for each set of the phase offset combinations of the combinations;
performing weighted calculation on the PAPR and the power peak value of each group of the phase offset combinations according to preset weights to obtain weighted values of each group of the phase offset combinations;
the specific step of selecting the phase offset combination with the lowest PAPR as the optimal phase offset combination is as follows:
selecting the phase offset combination with the lowest weighted value as the optimal phase offset combination.
4. The phase shifting method according to claim 2, wherein the third predetermined value is smaller than the second predetermined value.
5. The phase shifting method according to claim 3, wherein the preset weight of the PAPR and the preset weight of the power peak are both 0.5.
6. The phase shifting method according to any one of claims 1 to 5, wherein the second predetermined value is 7.
7. A phase shifting apparatus for use in a power line communication system, comprising:
the device comprises a grouping module, a receiving module and a transmitting module, wherein the grouping module is used for dividing signals to be transmitted into signal sections of a first preset value group, and the number of subcarriers in each group of signal sections is not more than a second preset value;
the calculation module is used for traversing and calculating the PAPR of all the phase offset combined sections of the subcarriers in each group of the signal sections;
the combination module is used for combining the phase offset combination sections with the lowest PAPR in each group of signal sections into a complete phase offset combination according to the original sequence of the subcarriers;
an execution module, configured to perform phase offset on the multiple subcarriers in the signal to be transmitted according to the phase offset combination;
wherein, this phase place shifter also includes:
combining the phase offset combination sections with the same reciprocal order of PAPRs in each group of signal sections into a complete phase offset combination according to the original sequence of the subcarriers, wherein the phase offset combination section with the first reciprocal order is ignored;
calculating the PAPR of each group of the phase offset combinations;
selecting the phase offset combination with the lowest PAPR as an optimal phase offset combination;
the phase shifting the plurality of subcarriers in the signal to be transmitted according to the phase shift combination specifically includes:
and carrying out phase offset on a plurality of subcarriers in the signal to be transmitted according to the optimal phase offset combination.
8. A phase shifting device applied to a power line communication system, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the phase shifting method of any one of claims 1 to 6 when executing said computer program.
9. A power line communication system comprising the phase shift device as claimed in claim 8 applied to the power line communication system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810966038.2A CN109039380B (en) | 2018-08-23 | 2018-08-23 | Power line communication system and phase deviation method, device and equipment thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810966038.2A CN109039380B (en) | 2018-08-23 | 2018-08-23 | Power line communication system and phase deviation method, device and equipment thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109039380A CN109039380A (en) | 2018-12-18 |
| CN109039380B true CN109039380B (en) | 2021-07-30 |
Family
ID=64627107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810966038.2A Active CN109039380B (en) | 2018-08-23 | 2018-08-23 | Power line communication system and phase deviation method, device and equipment thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109039380B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101087284A (en) * | 2006-06-09 | 2007-12-12 | 罗仁泽 | A joint method for reducing OFDM signal peak flat ratio |
| CN101335734A (en) * | 2008-01-08 | 2008-12-31 | 上海交通大学 | Peak-to-average ratio reducing method and device based on approximate statistical sectional companding |
| CN101340417A (en) * | 2008-08-28 | 2009-01-07 | 北京交通大学 | Improved iterative PTS method for lowering peak-average-ratio in OFDM system |
| CN101459646A (en) * | 2009-01-07 | 2009-06-17 | 北京邮电大学 | Method for reducing peak-average power ratio based on multi-carrier continuous phase modulation system |
| CN101958873A (en) * | 2010-10-11 | 2011-01-26 | 华中科技大学 | Information transmission method for reducing peak to average power ratio of orthogonal frequency division multiplexing signal |
| CN107786483A (en) * | 2016-08-26 | 2018-03-09 | 华为技术有限公司 | Data signal processing method and relevant device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI257794B (en) * | 2003-01-24 | 2006-07-01 | Ind Tech Res Inst | System and method of protecting and transmitting side information for multicarrier communication systems with reduced peak-to-average power ratio |
| CN101304398A (en) * | 2008-06-20 | 2008-11-12 | 重庆大学 | Method for reducing PAR of OFDM system |
| CN101510866B (en) * | 2008-12-31 | 2012-07-04 | 华为技术有限公司 | Method, apparatus and transmitter for restraining signal peak-equal power ratio |
-
2018
- 2018-08-23 CN CN201810966038.2A patent/CN109039380B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101087284A (en) * | 2006-06-09 | 2007-12-12 | 罗仁泽 | A joint method for reducing OFDM signal peak flat ratio |
| CN101335734A (en) * | 2008-01-08 | 2008-12-31 | 上海交通大学 | Peak-to-average ratio reducing method and device based on approximate statistical sectional companding |
| CN101340417A (en) * | 2008-08-28 | 2009-01-07 | 北京交通大学 | Improved iterative PTS method for lowering peak-average-ratio in OFDM system |
| CN101459646A (en) * | 2009-01-07 | 2009-06-17 | 北京邮电大学 | Method for reducing peak-average power ratio based on multi-carrier continuous phase modulation system |
| CN101958873A (en) * | 2010-10-11 | 2011-01-26 | 华中科技大学 | Information transmission method for reducing peak to average power ratio of orthogonal frequency division multiplexing signal |
| CN107786483A (en) * | 2016-08-26 | 2018-03-09 | 华为技术有限公司 | Data signal processing method and relevant device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109039380A (en) | 2018-12-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101374125B (en) | Method and apparatus for reducing PAR | |
| CN101860395B (en) | Method and equipment for generating preamble sequence | |
| WO2007105901A2 (en) | Apparatus for calculating papr and method thereof | |
| CN101471761A (en) | Multi-carrier communication via sub-carrier groups | |
| CN109274629B (en) | Peak power optimization method and emission system in ofdm system | |
| CN105337911B (en) | A kind of removing method and device of inter-sub-carrier interference | |
| CN103067316A (en) | Crosstalk channel estimation method and device and system | |
| CN109039380B (en) | Power line communication system and phase deviation method, device and equipment thereof | |
| CN107426129A (en) | A kind of modulation, demodulation method and the device of GFDM signals | |
| CN102447621B (en) | Optimal link selecting method and equipment | |
| CN102387101A (en) | Method, device and system for data sending, receiving and transmitting | |
| CN109873783B (en) | Information sending method and device | |
| TW200525920A (en) | Method and apparatus for peak to average power ratio reduction | |
| CN105245253A (en) | OFDM (Orthogonal Frequency Division Multiplexing)-based PLC (Power Line Communication) system subcarrier bit parallel loading method | |
| CN112104397B (en) | MIMO power line communication data transmission method and device | |
| CN102638431A (en) | Bit dispensing equipment, transmitter, bit distribution method and power distribution method | |
| CN112866159B (en) | Baseband signal generation method and related device | |
| CN106656891B (en) | Data processing equipment in LTE system | |
| CN109660316A (en) | Signaling method and device | |
| CN1960198B (en) | Analysis method of sub carrier wave, bits, power in use for orthogonal frequency division multiple access system | |
| CN106559376B (en) | A kind of signal processing method and receiving device | |
| CN103117982B (en) | Data transmission method of OFDM system based on subcarrier grouping | |
| CN109194601A (en) | Reduce the threshold classification SLM method and system of ofdm system peak-to-average power ratio | |
| CN109309638A (en) | Approach for blind channel equalization and device, computer storage medium and calculating equipment | |
| KR102115074B1 (en) | Apparatus and Method for Reducing PAPR using SLM |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20210708 Address after: 510663 3 building, 3, 4, 5 and J1 building, 11 building, No. 11, Ke Xiang Road, Luogang District Science City, Guangzhou, Guangdong. Applicant after: China Southern Power Grid Research Institute Co.,Ltd. Applicant after: CHINA SOUTHERN POWER GRID Co.,Ltd. Address before: 510663 3 building, 3, 4, 5 and J1 building, 11 building, No. 11, Ke Xiang Road, Luogang District Science City, Guangzhou, Guangdong. Applicant before: China Southern Power Grid Research Institute Co.,Ltd. Applicant before: CHINA SOUTHERN POWER GRID Co.,Ltd. Applicant before: CSG POWER GRID TECHNOLOGY RESEARCH CENTER |
|
| TA01 | Transfer of patent application right | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |