CN111464210B - Data diversity combining method and device, communication equipment and storage medium - Google Patents
Data diversity combining method and device, communication equipment and storage medium Download PDFInfo
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Abstract
The invention discloses a diversity combining method and device of data, communication equipment and a storage medium, wherein the method comprises the following steps: selecting and reserving data for diversity combining according to a preset selection strategy according to the subcarrier position information of the narrow-band noise; generating diversity combining coefficients according to the reserved data; and carrying out diversity combination on each path of data according to the diversity combination coefficient. The embodiment of the invention is applied to a power line communication system, can adapt to the power line communication environment, and selects and reserves the data with less narrow-band noise pollution for self-adaptive diversity by utilizing the position relation of the data and the narrow-band noise, thereby reducing the influence of the narrow-band noise on the signal, obtaining better diversity gain and improving the reliability of data transmission.
Description
Technical Field
The present invention relates to the field of power line communication technologies, and in particular, to a method and an apparatus for diversity combining of data, a communication device, and a storage medium.
Background
Power line communication is a communication method for transmitting information using an existing electric wire. Due to the advantages of low cost, low power consumption, and the like, power line communication is receiving great attention at present. In a power line communication system, narrow-band noise is one of important factors that restrict communication reliability. In general, the narrow-band noise in the power line channel is a sudden high-power noise, which has a wide source, including various switches, and is difficult to predict and filter. Therefore, how to reduce and eliminate the influence of the narrowband noise interference on the power line communication becomes an important technology in the field of power line communication.
At present, there are various schemes for reducing the influence of the narrow-band noise, including an adaptive filter, a trap filter, etc., where the adaptive filtering technology mainly uses strong correlation of the narrow-band noise to remove the narrow-band noise from the received signal by estimating the frequency of the narrow-band noise. The wave trap mainly utilizes the narrow-band characteristic of narrow-band noise to design a band-stop filter with very narrow bandwidth so as to eliminate the narrow-band noise.
By the scheme, the influence of the narrow-band noise on the signal can be eliminated to a certain extent, but the narrow-band noise cannot be eliminated completely, so that the signal detection fails, the performance is reduced, and the reliability of data transmission is reduced.
Disclosure of Invention
In view of this, the diversity combining method and apparatus for data, the communication device, and the storage medium provided in the embodiments of the present invention may adapt to a power line communication environment, and select and retain data with less narrowband noise pollution for adaptive diversity by using a position relationship between the data and the narrowband noise, thereby reducing an influence of the narrowband noise on a signal, obtaining a better diversity gain, and improving reliability of data transmission.
The technical scheme adopted by the invention for solving the technical problems is as follows:
according to an aspect of the embodiments of the present invention, there is provided a diversity combining method for data, applied to a power line communication system, the method including:
selecting and reserving data for diversity combining according to a preset selection strategy according to the subcarrier position information of the narrow-band noise;
generating diversity combining coefficients according to the reserved data;
and carrying out diversity combination on each path of data according to the diversity combination coefficient.
In one possible design, the method further includes: and deleting the data with the same position as the subcarrier of the narrow-band noise according to the position information of the subcarrier of the narrow-band noise.
In one possible design, before the selecting, according to the subcarrier position information of the narrowband noise and according to a preset selection policy, data reserved for diversity combining, the method further includes: and obtaining a subcarrier index corresponding to each path of data, wherein the subcarrier index comprises subcarrier position information of the data.
In a possible design, the obtaining the subcarrier index corresponding to each path of data includes obtaining L paths of repeated data by copying data for multiple times, and obtaining subcarrier index information corresponding to subcarriers of the L paths of data; or, obtaining the L-way repeated data by multiple retransmission and obtaining the subcarrier index information corresponding to the subcarriers of the L-way data.
In one possible design, before the selecting, according to the subcarrier position information of the narrowband noise and according to a preset selection policy, data reserved for diversity combining, the method further includes: and detecting whether the obtained data has narrow-band noise, and if so, estimating the subcarrier position information of the narrow-band noise.
In one possible design, when the position of the subcarrier where the narrowband noise is located is the middle position of two adjacent subcarriers, the position of the subcarrier of the narrowband noise is the positions of the left subcarrier and the right subcarrier thereof.
In one possible design, the method may further include estimating channel information and snr information for the data.
In one possible design, the preset selection strategy includes: respectively comparing the subcarrier position information of each path of data with the subcarrier position information of the narrow-band noise; if the position distance between the two is greater than 1, the data of the path is reserved; and if the position distance between the two is less than or equal to 1, deleting the path of data.
In one possible design, the generating diversity combining coefficients according to the reserved data includes: generating diversity combining coefficients according to the subcarrier positions and channel information of the reserved data combined data, as shown in the following formula:
Wl＝ClH*l
wherein, WlDiversity combining coefficient for the l-th data, ClIs a weighting coefficient of the l-th data, HlThe channel information of the first path of data is represented by 'a' and represents conjugation, and L is more than or equal to 1 and less than or equal to L.
In one possible design, the diversity combining is performed on each path of data according to the diversity combining coefficient; the method comprises the following steps: and dividing the sum of the products of multiplying the data of each path by the corresponding diversity combining coefficient by the sum of the diversity combining coefficients of each path to obtain the data subjected to diversity combining.
In one possible design, the method further includes: and demodulating, decoding and CRC (cyclic redundancy check) the data after diversity combination.
According to another aspect of the present invention, there is provided an apparatus for diversity combining of data, the apparatus being applied to a method for diversity combining of data; the device comprises: a diversity combining data selecting module, a diversity combining coefficient generating module and a data diversity combining module; wherein:
the selection diversity combining data module is used for selecting and reserving data for diversity combining according to the subcarrier position information of the narrow-band noise and a preset selection strategy;
the diversity combining coefficient generating module is used for generating diversity combining coefficients according to the data reserved by the selection diversity combining data module;
and the data diversity combining module is used for performing diversity combining on each path of data according to the diversity combining coefficient generated by the diversity combining coefficient generating module.
According to another aspect of the present invention, there is provided a communication apparatus including: the invention also relates to a data diversity combining method, a data diversity combining device and a data diversity combining system.
According to another aspect of the present invention, a readable storage medium is provided, which stores a program of a diversity combining method of data, and the program of the diversity combining method of data is executed by a processor to implement the steps of a boxing robot boxing method provided by the embodiment of the present invention.
Compared with the related art, the data diversity combining method and device, the communication device and the storage medium provided by the embodiment of the invention comprise the following steps: selecting and reserving data for diversity combining according to a preset selection strategy according to the subcarrier position information of the narrow-band noise; generating diversity combining coefficients according to the reserved data; and carrying out diversity combination on each path of data according to the diversity combination coefficient. The embodiment of the invention is applied to a power line communication system, can adapt to the power line communication environment, and selects and reserves the data with less narrow-band noise pollution for self-adaptive diversity by utilizing the position relation of the data and the narrow-band noise, thereby reducing the influence of the narrow-band noise on the signal, obtaining better diversity gain and improving the reliability of data transmission.
Drawings
Fig. 1 is a flowchart illustrating a method for diversity combining of data according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a data diversity combining apparatus according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a data diversity combining method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
In one embodiment, as shown in fig. 1, the present invention provides a diversity combining method for data, applied to a power line communication system, the method including:
s1, selecting and reserving data for diversity combining according to the subcarrier position information of the narrow-band noise and a preset selection strategy;
s2, generating diversity combining coefficient according to the reserved data;
and S3, diversity combining is carried out on each path of data according to the diversity combining coefficient.
In this embodiment, the data diversity combining method is applied to a power line communication system, and can adapt to a power line communication environment, and select and retain data with less narrowband noise pollution for adaptive diversity by using the position relationship between the data and the narrowband noise, thereby reducing the influence of the narrowband noise on signals, obtaining better diversity gain, and improving the reliability of data transmission.
Preferably, the step S1 further includes: and deleting the data with the same position as the subcarrier of the narrow-band noise according to the position information of the subcarrier of the narrow-band noise.
In one embodiment, before the step S1, the method further includes: and obtaining a subcarrier index corresponding to each path of data, wherein the subcarrier index comprises subcarrier position information of the data.
Preferably, the obtaining the subcarrier index corresponding to each path of data includes obtaining multiple paths (L paths, where L is an integer greater than 1) of repeated data in a manner of copying data multiple times, and obtaining subcarrier index information corresponding to subcarriers of the L paths of data; or, obtaining the L-way repeated data by multiple retransmission and obtaining the subcarrier index information corresponding to the subcarriers of the L-way data.
In this embodiment, the receiving end receives multiple repeated data from the transmitting end, and obtains subcarrier index information corresponding to subcarriers of the multiple data from the transmitting end, so as to obtain subcarrier position information of the multiple data, so that diversity combining can be performed at the receiving end, and thus data transmission reliability is improved.
In one embodiment, before the step S1, the method further includes: and detecting whether the obtained data has narrow-band noise, and if so, estimating the information of the amplitude, the frequency, the position of the positioned subcarrier and the like of the narrow-band noise.
Further, if the subcarrier position of the narrowband noise is the middle position of two adjacent subcarriers, the subcarrier position of the narrowband noise is the positions of the left subcarrier and the right subcarrier thereof.
For example, in section 4-1 of the technical specification for interconnection and interworking of low-voltage power line broadband carrier communication: in physical layer communication, when the center frequency point of the narrow-band noise is 11M, the position index of the subcarrier where the narrow-band noise frequency point is located is considered as a vector [ 450451 ].
In this embodiment, by detecting whether the obtained data has the narrow-band noise, and estimating information such as the amplitude, the frequency, the position of the located subcarrier, and the like of the narrow-band noise when the narrow-band noise exists, the subcarrier position information of the narrow-band noise is obtained quickly and effectively, and the position relationship between the data and the narrow-band noise is obtained.
In one embodiment, the method further comprises: channel information and signal-to-noise ratio information of the data are estimated.
In one embodiment, in step S1, the preset selection policy includes: respectively comparing the subcarrier position information of each path of data with the subcarrier position information of the narrow-band noise; if the position distance (subcarrier difference) between the two is greater than 1, the data of the path is reserved; if the position distance (subcarrier difference) between the two is less than or equal to 1, the subcarrier position of the data is regarded as the same as the position of the subcarrier of the narrow-band noise, the data of the path is deleted, and the number L of the data paths is reduced by 1.
In this embodiment, data for diversity combining is selected and reserved by a preset selection strategy that compares subcarrier position information of each path of data with subcarrier position information of narrowband noise, data with less narrowband noise pollution is selected and reserved for adaptive diversity, and data with the same position as the subcarrier of the narrowband noise is deleted, so that the influence of the narrowband noise on signals is reduced, better diversity gain is obtained, and the reliability of data transmission is improved.
In one embodiment, in step S2, the generating diversity combining coefficients according to the retained data; the method comprises the following steps: generating diversity combining coefficients according to the subcarrier positions and channel information of the reserved data combined data, as shown in the following formula:
Wl＝ClH*l
wherein, WlDiversity combining coefficient for the l-th data, ClIs a weighting coefficient of the l-th data, HlIs channel information of the first line data'And x' represents conjugation, and L is more than or equal to 1 and less than or equal to L. Wherein the weighting coefficient C (0)<C ≦ 1) is proportional to the distance between the subcarrier location information of the data and the subcarrier location of the narrowband noise.
When the distance between the subcarrier position index of the ith path of data and the subcarrier position index of the narrow-band noise is smaller than a preset value d, the diversity combining coefficient WlMultiplying the channel information by a weighting factor C, i.e. Wl＝ClH*l。
When the distance between the subcarrier position index of the ith path of data and the subcarrier position index of the narrow-band noise is more than or equal to a preset value d, the weighting coefficient C is equal to 1, and the diversity combining coefficient Wl＝H*l。
Preferably, the preset value d is related to the amplitude of the narrow-band noise and the number of subcarriers, and the larger the amplitude of the narrow-band noise is, the larger the value of the preset value d is; the larger the number of subcarriers is, the larger the value of the preset value d is.
For example, when the power of the narrow-band noise exceeds the signal power by 10dB, for the "low-voltage power line broadband carrier communication interconnection and interworking specification, part 4-1: band 0 in physical layer communication ": when the number N of the subcarriers is 411, the value of d is suggested to be 20; band 1: when N is 131, the value of d is suggested to be 12; band 2: when N is 89, the value of d is 8; band 3: when N is 49, a value of 5 is suggested for d.
Preferably, for the "low voltage power line broadband carrier communication interconnection and interworking technical specification, part 4-1: band 0 in physical layer communication ": when the number of subcarriers N is 411, the value vector of C is suggested to be [0.525:0.025:1 ]; band 1: when N is 131, the value vector of c is suggested to be [0.66:0.03:1 ]; band 2: when N is 89, the value vector of C is suggested to be [0.65:0.05:1 ]; band 3: when N is 49, the value vector of C is suggested to be [0.65:0.075:1 ].
In this embodiment, a diversity combining coefficient is generated according to the subcarrier position and channel information of the data combined data retained by the selection diversity combining data module, so that the retained data is subjected to adaptive diversity according to the diversity combining coefficient, thereby reducing the influence of narrowband noise on signals, obtaining better diversity gain, and improving the reliability of data transmission.
In an embodiment, in the step S3, the diversity combining is performed on each path of data according to the diversity combining coefficient; the method comprises the following steps:
and dividing the sum of the products of multiplying the data of each path by the corresponding diversity combining coefficient by the sum of the diversity combining coefficients of each path to obtain the data subjected to diversity combining. I.e. as shown in the following equation:
Y＝(W1Y1+W2Y2+…WlYl…+WLYL)/(W1+W2+Wl+…+WL)
y is data after diversity combining, WlDiversity combining coefficient, Y, for the l-th datalIs the data received for the l-th way.
In one embodiment, the method further comprises: the diversity-combined data is demodulated, decoded, and CRC (Cyclic Redundancy Check) checked.
In one embodiment, as shown in fig. 2, the present invention provides a diversity combining apparatus for data, which is applied to a power line communication system, the apparatus including: a selection diversity combining data module 40, a generation diversity combining coefficient module 50 and a data diversity combining module 60; wherein:
the selection diversity combining data module 40 is configured to select and reserve data for diversity combining according to a preset selection strategy according to the subcarrier position information of the narrowband noise;
the module 50 for generating diversity combining coefficients is configured to generate diversity combining coefficients according to the data retained by the module 40 for selecting diversity combining;
the data diversity combining module 60 is configured to perform diversity combining on each path of data according to the diversity combining coefficient generated by the diversity combining coefficient generating module 50.
In this embodiment, the data diversity combining apparatus is applied to a power line communication system, and is capable of adapting to a power line communication environment, and selecting and retaining data with less narrowband noise pollution for adaptive diversity by using a positional relationship between the data and the narrowband noise, so as to reduce an influence of the narrowband noise on a signal, obtain a better diversity gain, and improve reliability of data transmission.
Preferably, the selection diversity combining data module 40 is further configured to delete data at a same position as a subcarrier where the narrowband noise is located according to the subcarrier position information of the narrowband noise.
In an embodiment, the apparatus further includes a subcarrier position obtaining module 20, where the subcarrier position obtaining module 20 is configured to obtain subcarrier indexes corresponding to each path of data; wherein the subcarrier index includes subcarrier position information of data.
Preferably, the obtaining the subcarrier index corresponding to each path of data includes obtaining multiple paths (L paths) of repeated data in a manner of copying data multiple times, and obtaining subcarrier index information corresponding to subcarriers of the L paths of data; or, obtaining the L-way repeated data by multiple retransmission and obtaining the subcarrier index information corresponding to the subcarriers of the L-way data.
In this embodiment, the receiving end receives multiple repeated data from the transmitting end, and obtains subcarrier index information corresponding to subcarriers of the multiple data from the transmitting end, so as to obtain subcarrier position information of the multiple data, so that diversity combining can be performed at the receiving end, and thus data transmission reliability is improved.
In one embodiment, the apparatus further includes a narrow-band noise detection module 10, where the narrow-band noise detection module 10 is configured to detect whether a narrow-band noise exists in the obtained data, and if the narrow-band noise exists, estimate information such as an amplitude, a frequency, a position of a located subcarrier, and the like of the narrow-band noise.
Further, if the subcarrier position of the narrowband noise is the middle position of two adjacent subcarriers, the subcarrier position of the narrowband noise is the positions of the left subcarrier and the right subcarrier thereof.
For example, in section 4-1 of the technical specification for interconnection and interworking of low-voltage power line broadband carrier communication: in physical layer communication, when the center frequency point of the narrow-band noise is 11M, the position index of the subcarrier where the narrow-band noise frequency point is located is considered as a vector [ 450451 ].
In this embodiment, the narrowband noise detection module detects whether narrowband noise exists in the obtained data, and estimates information such as amplitude, frequency, position of the located subcarrier, and the like of the narrowband noise when the narrowband noise exists, so as to quickly and effectively obtain the subcarrier position information of the narrowband noise, and obtain the position relationship between the data and the narrowband noise.
In one embodiment, the apparatus further comprises an snr estimation module 30, wherein the snr estimation module 30 is configured to estimate channel information and snr information of the data.
In an embodiment, the selection diversity combining data module 40 is configured to select and reserve data for diversity combining according to a preset selection policy according to the subcarrier position information of the narrowband noise; wherein the preset selection strategy comprises: respectively comparing the subcarrier position information of each path of data with the subcarrier position information of the narrow-band noise; if the position distance (subcarrier difference) between the two is greater than 1, the data of the path is reserved; if the position distance (subcarrier difference) between the two is less than or equal to 1, the subcarrier position of the data is regarded as the same as the position of the subcarrier of the narrow-band noise, the data of the path is deleted, and the number L of the data paths is reduced by 1.
In this embodiment, data for diversity combining is selected and reserved by a preset selection strategy that compares subcarrier position information of each path of data with subcarrier position information of narrowband noise, data with less narrowband noise pollution is selected and reserved for adaptive diversity, and data with the same position as the subcarrier of the narrowband noise is deleted, so that the influence of the narrowband noise on signals is reduced, better diversity gain is obtained, and the reliability of data transmission is improved.
In one embodiment, the module 50 for generating diversity combining coefficients according to the data retained by the module 40 for selecting diversity combining comprises:
the module 50 for generating diversity combining coefficients is configured to generate diversity combining coefficients according to the subcarrier positions and channel information of the data combining data retained by the module 40 for selecting diversity combining, and includes: generating diversity combining coefficients according to the subcarrier positions and channel information of the reserved data combined data, as shown in the following formula:
Wl＝ClH*l
wherein, WlDiversity combining coefficient for the l-th data, ClIs a weighting coefficient of the l-th data, HlThe channel information of the first path of data is represented by 'a' and represents conjugation, and L is more than or equal to 1 and less than or equal to L. Wherein the weighting coefficient C (0)<C ≦ 1) is proportional to the distance between the subcarrier location information of the data and the subcarrier location of the narrowband noise.
When the distance between the subcarrier position index of the ith path of data and the subcarrier position index of the narrow-band noise is smaller than a preset value d, the diversity combining coefficient WlMultiplying the channel information by a weighting factor C, i.e. Wl＝ClH*l。
When the distance between the subcarrier position index of the ith path of data and the subcarrier position index of the narrow-band noise is more than or equal to a preset value d, the weighting coefficient C is equal to 1, and the diversity combining coefficient Wl＝H*l。
Preferably, the preset value d is related to the amplitude of the narrow-band noise and the number of subcarriers, and the larger the amplitude of the narrow-band noise is, the larger the value of the preset value d is; the larger the number of subcarriers is, the larger the value of the preset value d is.
For example, when the power of the narrow-band noise exceeds the signal power by 10dB, for the "low-voltage power line broadband carrier communication interconnection and interworking specification, part 4-1: band 0 in physical layer communication ": when the number N of the subcarriers is 411, the value of d is suggested to be 20; band 1: when N is 131, the value of d is suggested to be 12; band 2: when N is 89, the value of d is 8; band 3: when N is 49, a value of 5 is suggested for d.
Preferably, for the "low voltage power line broadband carrier communication interconnection and interworking technical specification, part 4-1: band 0 in physical layer communication ": when the number of subcarriers N is 411, the value vector of C is suggested to be [0.525:0.025:1 ]; band 1: when N is 131, the value vector of c is suggested to be [0.66:0.03:1 ]; band 2: when N is 89, the value vector of C is suggested to be [0.65:0.05:1 ]; band 3: when N is 49, the value vector of C is suggested to be [0.65:0.075:1 ].
In this embodiment, a diversity combining coefficient is generated according to the subcarrier position and channel information of the data combined data retained by the selection diversity combining data module, so that the retained data is subjected to adaptive diversity according to the diversity combining coefficient, thereby reducing the influence of narrowband noise on signals, obtaining better diversity gain, and improving the reliability of data transmission.
In an embodiment, the data diversity combining module 60 is configured to perform diversity combining on each path of data according to the diversity combining coefficient generated by the diversity combining coefficient generating module 50; the method comprises the following steps:
and dividing the sum of the products of multiplying the data of each path by the corresponding diversity combining coefficient by the sum of the diversity combining coefficients of each path to obtain the data subjected to diversity combining. I.e. as shown in the following equation:
Y＝(W1Y1+W2Y2+…WlYl…+WLYL)/(W1+W2+Wl+…+WL)
y is data after diversity combining, WlDiversity combining coefficient, Y, for the l-th datalIs the data received for the l-th way.
In one embodiment, the apparatus further comprises a demodulation decoding module 70, and the demodulation decoding module 70 demodulates, decodes and CRC checks the diversity-combined data.
It should be noted that the device embodiment and the method embodiment belong to the same concept, and specific implementation processes thereof are described in detail in the method embodiment, and technical features in the method embodiment are correspondingly applicable in the device embodiment, which is not described herein again.
The technical solution of the present invention is further described in detail with reference to the following specific examples.
In one embodiment, as shown in fig. 2, the present invention provides a diversity combining apparatus for a power line communication system, the apparatus comprising: a narrow-band noise detection module 10, a subcarrier position acquisition module 20, a signal-to-noise ratio estimation module 30, a selection diversity combining data module 40, a diversity combining coefficient generation module 50, a data diversity combining module 60 and a demodulation decoding module 70; wherein:
the subcarrier position obtaining module 20 is configured to obtain subcarrier indexes corresponding to each path of data, where the subcarrier indexes include subcarrier position information of the data; obtaining subcarrier indexes corresponding to each path of data comprises obtaining multipath (L-path) repeated data in a mode of copying data for multiple times, and obtaining subcarrier index information corresponding to subcarriers of the L-path data; or, obtaining the L-way repeated data by multiple retransmission, and obtaining subcarrier index information corresponding to subcarriers of the L-way data.
The narrowband noise detection module 10 is configured to detect whether narrowband noise exists in the obtained data, and if narrowband noise exists, estimate information such as amplitude, frequency, and position of a subcarrier where the narrowband noise exists.
Further, if the subcarrier position of the narrowband noise is the middle position of two adjacent subcarriers, the subcarrier position of the narrowband noise is the positions of the left subcarrier and the right subcarrier thereof.
For example, in section 4-1 of the technical specification for interconnection and interworking of low-voltage power line broadband carrier communication: in physical layer communication, when the center frequency point of the narrow-band noise is 11M, the position index of the subcarrier where the narrow-band noise frequency point is located is considered as a vector [ 450451 ].
The snr estimation module 30 is configured to estimate channel information and snr information of data.
And the selection diversity combining data module 40 is configured to select and reserve data with less narrow-band noise pollution for diversity combining according to the position information of the narrow-band noise subcarrier and a preset selection strategy, and delete data with the same position as the narrow-band noise subcarrier. Wherein the preset selection strategy comprises: respectively comparing the subcarrier position information of each path of data with the subcarrier position information of the narrow-band noise; if the position distance (subcarrier difference) between the two is greater than 1, the data of the path is reserved; if the position distance (subcarrier difference) between the two is less than or equal to 1, the subcarrier position of the data is regarded as the same as the position of the subcarrier of the narrow-band noise, the data of the path is deleted, and the number L of the data paths is reduced by 1.
The module 50 for generating diversity combining coefficients is configured to generate diversity combining coefficients according to the subcarrier positions of the data reserved by the module 40 for selecting diversity combining data and the channel information of the data. The method comprises the following steps:
the module 50 for generating diversity combining coefficients is configured to generate diversity combining coefficients according to the subcarrier positions and channel information of the data combining data retained by the module 40 for selecting diversity combining, and includes: generating diversity combining coefficients according to the subcarrier positions and channel information of the reserved data combined data, as shown in the following formula:
Wl＝ClH*l
wherein, WlDiversity combining coefficient for the l-th data, ClIs a weighting coefficient of the l-th data, HlThe channel information of the first path of data is represented by 'a' and represents conjugation, and L is more than or equal to 1 and less than or equal to L. Wherein the weighting coefficient C (0)<C ≦ 1) is proportional to the distance between the subcarrier location information of the data and the subcarrier location of the narrowband noise.
When the distance between the subcarrier position index of the ith path of data and the subcarrier position index of the narrow-band noise is smaller than a preset value d, the diversity combining coefficient WlMultiplying the channel information by a weighting factor C, i.e. Wl＝ClH*l。
When the distance between the subcarrier position index of the ith path of data and the subcarrier position index of the narrow-band noise is more than or equal to a preset value d, the weighting coefficient C is equal to 1, and the diversity combining coefficient Wl＝H*l。
Preferably, the preset value d is related to the amplitude of the narrow-band noise and the number of subcarriers, and the larger the amplitude of the narrow-band noise is, the larger the value of the preset value d is; the larger the number of subcarriers is, the larger the value of the preset value d is.
For example, when the power of the narrow-band noise exceeds the signal power by 10dB, for the "low-voltage power line broadband carrier communication interconnection and interworking specification, part 4-1: band 0 in physical layer communication ": when the number N of the subcarriers is 411, the value of d is suggested to be 20; band 1: when N is 131, the value of d is suggested to be 12; band 2: when N is 89, the value of d is 8; band 3: when N is 49, a value of 5 is suggested for d.
Preferably, for the "low voltage power line broadband carrier communication interconnection and interworking technical specification, part 4-1: band 0 in physical layer communication ": when the number of subcarriers N is 411, the value vector of C is suggested to be [0.525:0.025:1 ]; band 1: when N is 131, the value vector of C is suggested to be [0.66:0.03:1 ]; band 2: when N is 89, the value vector of c is suggested to be [0.65:0.05:1 ]; band 3: when N is 49, the value vector of C is suggested to be [0.65:0.075:1 ].
The data diversity combining module 60 is configured to perform diversity combining on each path of data according to the diversity combining coefficient generated by the diversity combining coefficient generating module 50. The method comprises the following steps:
and dividing the sum of the products of multiplying the data of each path by the corresponding diversity combining coefficient by the sum of the diversity combining coefficients of each path to obtain the data subjected to diversity combining. I.e. as shown in the following equation:
Y＝(W1Y1+W2Y2+…WlYl…+WLYL)/(W1+W2+Wl+…+WL)
y is data after diversity combining, WlDiversity combining coefficient, Y, for the l-th datalIs the data received for the l-th way.
The demodulation and decoding module 70 is configured to demodulate, decode, and check CRC on the diversity-combined data.
In this embodiment, the data diversity combining method is applied to a power line communication system, and is applicable to a power line communication environment, a receiving end receives multiple paths of repeated data from a transmitting end, selects and retains data for diversity combining by using a position relationship between the data and narrowband noise and by comparing a preset selection strategy of subcarrier position information of each path of data and subcarrier position information of the narrowband noise, selects and retains data with less narrowband noise pollution for adaptive diversity, deletes data with the same position as a subcarrier of the narrowband noise, thereby reducing the influence of the narrowband noise on signals, obtaining better diversity gain, and improving reliability of data transmission.
In one embodiment, as shown in fig. 3, the present invention provides a diversity combining method for data, which is applied to a power line communication system, and the method includes:
s301, obtaining subcarrier indexes corresponding to each path of data, wherein the subcarrier indexes comprise subcarrier position information of the data.
Preferably, the obtaining the subcarrier index corresponding to each path of data includes obtaining multiple paths (L paths) of repeated data in a manner of copying data multiple times, and obtaining subcarrier index information corresponding to subcarriers of the L paths of data; or, obtaining the L-way repeated data by multiple retransmission and obtaining the subcarrier index information corresponding to the subcarriers of the L-way data.
S302, whether the narrow-band noise exists in the obtained data is detected, and if the narrow-band noise exists, information such as the amplitude, the frequency and the position of the subcarrier of the narrow-band noise is estimated.
Further, if the subcarrier position of the narrowband noise is the middle position of two adjacent subcarriers, the subcarrier position of the narrowband noise is the positions of the left subcarrier and the right subcarrier thereof.
For example, in section 4-1 of the technical specification for interconnection and interworking of low-voltage power line broadband carrier communication: in physical layer communication, when the center frequency point of the narrow-band noise is 11M, the position index of the subcarrier where the narrow-band noise frequency point is located is considered as a vector [ 450451 ].
And S303, estimating channel information and signal-to-noise ratio information of the data.
And S304, selecting and reserving data for diversity combination according to a preset selection strategy according to the position information of the narrow-band noise subcarrier. Wherein the preset selection strategy comprises: respectively comparing the subcarrier position information of each path of data with the subcarrier position information of the narrow-band noise; if the position distance (subcarrier difference) between the two is greater than 1, the data of the path is reserved; if the position distance (subcarrier difference) between the two is less than or equal to 1, the subcarrier position of the data is regarded as the same as the position of the subcarrier of the narrow-band noise, the data of the path is deleted, and the number L of the data paths is reduced by 1.
And S305, generating diversity combining coefficients according to the reserved data. The method comprises the following steps:
generating diversity combining coefficients according to the subcarrier positions and channel information of the reserved data combined data, as shown in the following formula:
Wl＝ClH*l
wherein, WlDiversity combining coefficient for the l-th data, ClIs a weighting coefficient of the l-th data, HlThe channel information of the first path of data is represented by 'a' and represents conjugation, and L is more than or equal to 1 and less than or equal to L. Wherein the weighting coefficient C (0)<C ≦ 1) is proportional to the distance between the subcarrier location information of the data and the subcarrier location of the narrowband noise.
When the distance between the subcarrier position index of the ith path of data and the subcarrier position index of the narrow-band noise is smaller than a preset value d, the diversity combining coefficient WlMultiplying the channel information by a weighting factor C, i.e. Wl＝ClH*l。
When the distance between the subcarrier position index of the ith path of data and the subcarrier position index of the narrow-band noise is more than or equal to a preset value d, the weighting coefficient C is equal to 1, and the diversity combining coefficient Wl＝H*l。
Preferably, the preset value d is related to the amplitude of the narrow-band noise and the number of subcarriers, and the larger the amplitude of the narrow-band noise is, the larger the value of the preset value d is; the larger the number of subcarriers is, the larger the value of the preset value d is.
For example, when the power of the narrow-band noise exceeds the signal power by 10dB, for the "low-voltage power line broadband carrier communication interconnection and interworking specification, part 4-1: band 0 in physical layer communication ": when the number N of the subcarriers is 411, the value of d is suggested to be 20; band 1: when N is 131, the value of d is suggested to be 12; band 2: when N is 89, the value of d is 8; band 3: when N is 49, a value of 5 is suggested for d.
Preferably, for the "low voltage power line broadband carrier communication interconnection and interworking technical specification, part 4-1: band 0 in physical layer communication ": when the number of subcarriers N is 411, the value vector of C is suggested to be [0.525:0.025:1 ]; band 1: when N is 131, the value vector of c is suggested to be [0.66:0.03:1 ]; band 2: when N is 89, the value vector of C is suggested to be [0.65:0.05:1 ]; band 3: when N is 49, the value vector of C is suggested to be [0.65:0.075:1 ].
S306, carrying out diversity combination on each path of data according to the diversity combination coefficient; the method comprises the following steps:
and dividing the sum of the products of multiplying the data of each path by the corresponding diversity combining coefficient by the sum of the diversity combining coefficients of each path to obtain the data subjected to diversity combining. I.e. as shown in the following equation:
Y＝(W1Y1+W2Y2+…WlYl…+WLYL)/(W1+W2+Wl+…+WL)
y is data after diversity combining, WlDiversity combining coefficient, Y, for the l-th datalIs the data received for the l-th way.
S307, demodulating, decoding and CRC checking the data after diversity combination.
In this embodiment, the data diversity combining method is applied to a power line communication system, and is applicable to a power line communication environment, a receiving end receives multiple paths of repeated data from a transmitting end, selects and retains data for diversity combining by using a position relationship between the data and narrowband noise and by comparing a preset selection strategy of subcarrier position information of each path of data and subcarrier position information of the narrowband noise, selects and retains data with less narrowband noise pollution for adaptive diversity, deletes data with the same position as a subcarrier of the narrowband noise, thereby reducing the influence of the narrowband noise on signals, obtaining better diversity gain, and improving reliability of data transmission.
In addition, an embodiment of the present invention further provides a boxing apparatus, as shown in fig. 4, the communication apparatus 1000 includes: a memory 1002, a processor 1001 and one or more computer programs stored in the memory 1002 and executable on the processor 1001, the memory 1002 and the processor 1001 being coupled together by a bus system 1003, the one or more computer programs when executed by the processor 1001 implementing the following steps of a method for diversity combining of data according to an embodiment of the present invention:
s1, selecting and reserving data for diversity combining according to the subcarrier position information of the narrow-band noise and a preset selection strategy;
s2, generating diversity combining coefficient according to the reserved data;
and S3, diversity combining is carried out on each path of data according to the diversity combining coefficient.
The method disclosed by the above embodiment of the present invention may be applied to the processor 1001, or implemented by the processor 1001. The processor 1001 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be implemented by an integrated logic circuit of hardware or instructions in the form of software in the processor 1001. The processor 1001 may be a general purpose processor, a DSP, or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. The processor 1001 may implement or perform the methods, steps, and logic blocks disclosed in the embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed by the embodiment of the invention can be directly implemented by a hardware decoding processor, or can be implemented by combining hardware and software modules in the decoding processor. The software modules may be located in a storage medium located in the memory 1002, and the processor 1001 reads the information in the memory 1002 and performs the steps of the aforementioned method in conjunction with its hardware.
It is to be understood that the memory 1002 of embodiments of the present invention can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. Among them, the nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a magnetic Random Access Memory (FRAM), a magnetic Random Access Memory (Flash Memory) or other Memory technologies, a Compact disc Read-Only Memory (CD-ROM), a Digital Versatile Disc (DVD), or other optical disc storage, magnetic cartridge, magnetic tape, magnetic Disk storage, or other magnetic storage devices; volatile Memory can be Random Access Memory (RAM), and by way of exemplary and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), Double Data Rate Synchronous Random Access Memory (ESDRAM), Synchronous Link Dynamic Random Access Memory (SLDRAM), Direct Memory bus Random Access Memory (DRRAM). The described memory for embodiments of the present invention is intended to comprise, without being limited to, these and any other suitable types of memory.
It should be noted that the apparatus embodiment and the method embodiment belong to the same concept, and specific implementation processes thereof are described in detail in the method embodiment, and technical features in the method embodiment are correspondingly applicable in the apparatus embodiment, which is not described herein again.
In addition, in an exemplary embodiment, an embodiment of the present invention further provides a computer storage medium, specifically a computer-readable storage medium, for example, the memory 1002 stores a computer program, where the computer storage medium stores one or more programs of a data diversity combining method, and when the one or more programs of the data diversity combining method are executed by the processor 1001, the following steps of the data diversity combining method provided by the embodiment of the present invention are implemented:
s1, selecting and reserving data for diversity combining according to the subcarrier position information of the narrow-band noise and a preset selection strategy;
s2, generating diversity combining coefficient according to the reserved data;
and S3, diversity combining is carried out on each path of data according to the diversity combining coefficient.
It should be noted that, the program embodiment of the diversity combining method for data on the computer-readable storage medium and the method embodiment belong to the same concept, and the specific implementation process thereof is described in detail in the method embodiment, and the technical features in the method embodiment are applicable to all the embodiments of the computer-readable storage medium, which is not described herein again.
It should be noted that, in this document, 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 like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (12)
1. A diversity combining method of data, applied to a power line communication system, is characterized in that the method comprises:
obtaining subcarrier indexes corresponding to each path of data, wherein the subcarrier indexes comprise subcarrier position information of the data; the method comprises the following steps: obtaining L-path repeated data by a data copying mode for multiple times, and obtaining subcarrier index information corresponding to subcarriers of the L-path data; or, obtaining L-path repeated data through a repeated retransmission mode, and obtaining subcarrier index information corresponding to subcarriers of the L-path data, wherein L is an integer greater than 1;
selecting and reserving data for diversity combining according to a preset selection strategy according to the subcarrier position information of the narrow-band noise;
generating diversity combining coefficients according to the reserved data;
and carrying out diversity combination on each path of data according to the diversity combination coefficient.
2. The method of claim 1, further comprising: and deleting the data with the same position as the subcarrier of the narrow-band noise according to the position information of the subcarrier of the narrow-band noise.
3. The method of claim 1, wherein before the selecting the data reserved for diversity combining according to a preset selection strategy based on the narrowband noise subcarrier location information, the method further comprises: and detecting whether the obtained data has narrow-band noise, and if so, estimating the subcarrier position information of the narrow-band noise.
4. The method of claim 3, wherein when the sub-carrier position of the narrow-band noise is the middle position of two adjacent sub-carriers, the sub-carrier position of the narrow-band noise is the positions of the left and right sub-carriers.
5. The method of claim 1, further comprising estimating channel information and signal-to-noise information for the data.
6. The method of claim 3, wherein the preset selection policy comprises: respectively comparing the subcarrier position information of each path of data with the subcarrier position information of the narrow-band noise; if the position distance between the two is greater than 1, the data of the path is reserved; and if the position distance between the two is less than or equal to 1, deleting the path of data.
7. The method of claim 1, wherein generating diversity combining coefficients according to the retained data comprises: generating diversity combining coefficients according to the subcarrier positions and channel information of the reserved data combined data, as shown in the following formula:
Wl＝ClH*l
wherein, WlDiversity combining coefficient for the l-th data, ClIs a weighting coefficient of the l-th data, HlThe channel information of the first path of data is represented by 'a' conjugate, L is more than or equal to 1 and less than or equal to L, and L is an integer more than 1.
8. The method of claim 1, wherein the diversity combining is performed on each path of data according to the diversity combining coefficient; the method comprises the following steps: and dividing the sum of the products of multiplying the data of each path by the corresponding diversity combining coefficient by the sum of the diversity combining coefficients of each path to obtain the data subjected to diversity combining.
9. The method according to any one of claims 1 to 8, further comprising: and demodulating, decoding and CRC (cyclic redundancy check) the data after diversity combination.
10. An apparatus for diversity combining of data, wherein the apparatus is applied to a method for diversity combining of data according to any one of claims 1 to 9; the device comprises: the device comprises a subcarrier position acquisition module, a diversity combining data selection module, a diversity combining coefficient generation module and a data diversity combining module; wherein:
the subcarrier position obtaining module is configured to obtain a subcarrier index corresponding to each channel of data, where the subcarrier index includes subcarrier position information of the data; the method comprises the following steps: obtaining L-path repeated data by a data copying mode for multiple times, and obtaining subcarrier index information corresponding to subcarriers of the L-path data; or, obtaining L-path repeated data through a repeated retransmission mode, and obtaining subcarrier index information corresponding to subcarriers of the L-path data, wherein L is an integer greater than 1;
the selection diversity combining data module is used for selecting and reserving data for diversity combining according to the subcarrier position information of the narrow-band noise and a preset selection strategy;
the diversity combining coefficient generating module is used for generating diversity combining coefficients according to the data reserved by the selection diversity combining data module;
and the data diversity combining module is used for performing diversity combining on each path of data according to the diversity combining coefficient generated by the diversity combining coefficient generating module.
11. A communication device, comprising: memory, processor and computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, performs the steps of a method for diversity combining of data according to any of claims 1 to 9.
12. A readable storage medium, on which a program of a method for diversity combining of data is stored, the program implementing the steps of the method for diversity combining of data according to any one of claims 1 to 9 when executed by a processor.
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