CN114584181B - Spread spectrum communication method, system, sending module and receiving module based on power line - Google Patents
Spread spectrum communication method, system, sending module and receiving module based on power line Download PDFInfo
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- CN114584181B CN114584181B CN202210199228.2A CN202210199228A CN114584181B CN 114584181 B CN114584181 B CN 114584181B CN 202210199228 A CN202210199228 A CN 202210199228A CN 114584181 B CN114584181 B CN 114584181B
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- 238000004891 communication Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000001228 spectrum Methods 0.000 title claims abstract description 31
- 230000005540 biological transmission Effects 0.000 claims description 35
- 238000013507 mapping Methods 0.000 claims description 26
- 238000001514 detection method Methods 0.000 claims description 13
- 238000007476 Maximum Likelihood Methods 0.000 claims description 6
- 230000001427 coherent effect Effects 0.000 claims description 6
- 230000011218 segmentation Effects 0.000 claims description 3
- 230000006870 function Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
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- 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
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to the technical field of power line communication, and discloses a spread spectrum communication method, a system, a sending module and a receiving module based on a power line. When the transmitting module of the invention transmits signals, the signal to be transmitted is divided into a plurality of information blocks comprising index bits and modulation bits, the index bits are mapped into transmitting time slices, the modulation bits are mapped into spreading codes, finally, analog signals are generated according to the transmitting time slices and the spreading codes and transmitted to a power line channel, the receiving module detects the signals of the power line channel, and carries out corresponding demapping on the detected signals, and the index bits and the modulation bits are recovered according to the demapping result, so that output signals are obtained according to the index bits and the modulation bits. The invention can solve the technical problems of larger noise interference, lower signal-to-noise ratio and low communication rate of the existing power line communication method, and realize high-rate reliable power line communication.
Description
Technical Field
The present invention relates to the field of power line communication technologies, and in particular, to a spread spectrum communication method, a system, a transmitting module, and a receiving module based on a power line.
Background
The power line communication uses a power transmission line as a transmission medium of signals to transmit data such as telephone calls, telegrams, telemechanical data, and remote protection signals. Because the power line is an energy transmission line, the power line is used for data transmission, and the defects of large noise interference, low signal-to-noise ratio, low communication rate and the like are overcome. In view of this drawback, it is necessary to study a new power line communication method.
Disclosure of Invention
The invention provides a spread spectrum communication method, a system, a sending module and a receiving module based on a power line, which solve the technical problems of larger noise interference, lower signal-to-noise ratio and low communication rate of the existing power line communication method and can realize high-rate reliable power line communication.
The first aspect of the present invention provides a spread spectrum communication method based on a power line, which is applied to a transmitting module, and includes:
dividing a signal to be transmitted into a plurality of information blocks, wherein each information block comprises index bits and modulation bits, and the sum of the index bits and the modulation bits is equal to the bit number of the corresponding information block;
mapping the index bits to transmit time slices and mapping the modulation bits to spreading codes;
and generating an analog signal according to the transmitting time slice and the spreading code, and transmitting the analog signal through a power line channel.
According to an implementation manner of the first aspect of the present invention, the mapping the index bit to a transmission time slice includes:
mapping the index bits into transmit time slices according to the following quantitative relationship:
wherein p is 2 For the number of index bits, N is the total number of transmit slots, N s For the number of transmit time slices mapped,representing a downward rounding function, and C (·) represents a binomial coefficient.
According to one implementation manner of the first aspect of the present invention, the dividing the signal to be transmitted into a plurality of information blocks includes:
the number of index bits in each of the information blocks is made the same as the number of modulation bits.
According to one implementation manner of the first aspect of the present invention, the generating an analog signal according to the transmit time slice and the spreading code specifically includes:
generating a pulse signal or a continuous wave signal according to the transmitting time slice and the spreading code.
A second aspect of the present invention provides a spread spectrum communication method based on a power line, applied to a receiving module, including:
obtaining an analog signal, wherein the analog signal is a pulse signal or a continuous wave signal;
demapping the analog signal, obtaining index bits according to the obtained transmission time slices, determining a spreading code according to the information in the transmission time slices after the demapping, and obtaining corresponding modulation bits according to the determined spreading code;
and obtaining an output signal according to the index bit and the modulation bit.
According to one manner that the second aspect of the present invention can be implemented, the acquiring an analog signal includes:
coherent and/or incoherent detection is performed on the signal of the power line channel.
According to one implementation manner of the second aspect of the present invention, the demapping the analog signal includes:
the analog signal is demapped based on a maximum likelihood criterion or a maximum a posteriori probability criterion.
A third aspect of the present invention provides a transmission module, including:
a bit allocation unit, configured to divide a signal to be transmitted into a plurality of information blocks, where each information block includes an index bit and a modulation bit, and the sum of the number of the index bits and the number of the modulation bits is equal to the number of bits of the corresponding information block;
a time slice index mapping unit, configured to map the index bits to a transmission time slice;
a spreading code mapping unit, configured to map the modulation bits into a spreading code;
and the transmitting signal generating unit is used for generating an analog signal according to the transmitting time slice and the spreading code and transmitting the analog signal through a power line channel.
According to an implementation manner of the third aspect of the present invention, the time slice index mapping unit is specifically configured to:
mapping the index bits into transmit time slices according to the following quantitative relationship:
wherein p is 2 For the number of index bits, N is the total number of transmit slots, N s For the number of transmit time slices mapped,representing a downward rounding function, and C (·) represents a binomial coefficient.
According to one implementation manner of the third aspect of the present invention, the bit allocation unit is specifically configured to:
when a signal to be transmitted is divided into a plurality of information blocks, the number of index bits in each information block is made the same as the number of modulation bits.
According to an implementation manner of the third aspect of the present invention, the transmission signal generating unit is specifically configured to:
generating a pulse signal or a continuous wave signal according to the transmitting time slice and the spreading code.
A fourth aspect of the present invention provides a receiving module comprising:
the signal detection unit is used for acquiring an analog signal, wherein the analog signal is a pulse signal or a continuous wave signal;
the time slice index demapping unit is used for demapping the analog signal and obtaining index bits according to the obtained transmission time slices;
a spreading code demapping unit, configured to determine a spreading code according to the information in the transmission time slice after the demapping, and obtain a corresponding modulation bit according to the determined spreading code;
and the signal output unit is used for obtaining an output signal according to the index bit and the modulation bit.
According to one implementation manner of the fourth aspect of the present invention, the signal detection unit is specifically configured to:
coherent and/or incoherent detection is performed on the signal of the power line channel.
According to one implementation manner of the fourth aspect of the present invention, the time slice index demapping unit is specifically configured to:
the analog signal is demapped based on a maximum likelihood criterion or a maximum a posteriori probability criterion.
A fifth aspect of the present invention provides a spread spectrum communication system based on a power line, comprising:
a transmitting module as described in any one of the above modes;
a power line channel;
and a receiving module as described in any one of the above modes of realisation.
From the above technical scheme, the invention has the following advantages:
when the transmitting module of the invention transmits signals, the signal to be transmitted is divided into a plurality of information blocks comprising index bits and modulation bits, the index bits are mapped into transmitting time slices, the modulation bits are mapped into spreading codes, finally, analog signals are generated according to the transmitting time slices and the spreading codes and transmitted to a power line channel, the receiving module detects the signals of the power line channel and carries out corresponding demapping on the detected signals, and the index bits and the modulation bits are recovered according to the demapping result, so that output signals are obtained according to the index bits and the modulation bits; the invention determines the time slice position of the transmitted signal through the time slice index, and utilizes the time slice index to carry additional information bits, thereby being beneficial to reducing the interference generated by other nodes in the system while improving the communication rate.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a block diagram showing the structural connection of a spread spectrum communication system based on a power line according to an alternative embodiment of the present invention;
fig. 2 is a flowchart of a power line-based spread spectrum communication method applied to a transmitting module according to an alternative embodiment of the present invention;
fig. 3 is a flowchart of a power line-based spread spectrum communication method applied to a receiving module according to an alternative embodiment of the present invention.
Reference numerals:
1-a transmitting module; 2-powerline channel; 3-a receiving module; an 11-bit allocation unit; 12-a time slice index mapping unit; a 13-spreading code mapping unit; 14-a transmission signal generation unit; 31-a signal detection unit; 32-a time slice index demapping unit; a 33-spread code demapping unit; 34-a signal output unit.
Detailed Description
The embodiment of the invention provides a spread spectrum communication method, a system, a sending module and a receiving module based on a power line, which are used for solving the technical problems of larger noise interference, lower signal-to-noise ratio and low communication rate of the existing power line communication method and can realize high-rate reliable power line communication.
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a spread spectrum communication system based on a power line.
Referring to fig. 1, fig. 1 shows a block diagram of structural connection of a spread spectrum communication system based on a power line according to an embodiment of the present invention.
The spread spectrum communication system based on the power line provided by the embodiment of the invention comprises a sending module 1, a power line channel 2 and a receiving module 3, wherein the sending module 1 is connected with the receiving module 3 through the power line channel 2.
Wherein, the sending module 1 includes:
a bit allocation unit 11, configured to divide a signal to be transmitted into a plurality of information blocks, each of the information blocks including index bits and modulation bits, where a sum of the index bits and the modulation bits is equal to a bit number of a corresponding information block;
a time slice index mapping unit 12, configured to map the index bits into a transmission time slice;
a spreading code mapping unit 13 for mapping the modulation bits into spreading codes;
a transmission signal generating unit 14 for generating an analog signal according to the transmission time slice and the spreading code, and transmitting the analog signal through the power line channel 2.
In a specific implementation manner, when a signal to be transmitted is divided into a plurality of information blocks, a specific length may be set, and the signal to be transmitted is segmented according to the specific length, so as to be allocated into the plurality of information blocks.
Let the number of bits contained in the information block be p, and the number of modulation bits be p 1 The number of index bits is p 2 Then p=p is satisfied 1 +p 2 And p, p 1 P 2 Are positive integers greater than 0. When the bit allocation is performed, p can be selected from the initial position of the segmentation information of the corresponding information block 2 Number of bits asIndex bits and the remaining number of bits are used as modulation bits, thereby dividing bits in the corresponding information block into index bits and modulation bits.
As a preferred embodiment, the number of index bits in each of the information blocks is the same as the number of modulation bits.
In one implementation manner, after the index bits are mapped to the transmission slots, the relationship among the number of index bits, the number of mapped transmission slots, and the total number of transmission slots is:
wherein p is 2 For the number of index bits, N is the total number of transmit slots, N s For the number of transmit time slices mapped,representing a downward rounding function, and C (·) represents a binomial coefficient.
In one implementation, the transmission signal generating unit 14 is specifically configured to:
generating a pulse signal or a continuous wave signal according to the transmitting time slice and the spreading code.
The receiving module 3 of the embodiment of the present invention includes:
a signal detection unit 31 for acquiring an analog signal, the analog signal being a pulse signal or a continuous wave signal;
a time slice index demapping unit 32, configured to demap the analog signal, and obtain index bits according to the obtained transmission time slices;
a spreading code demapping unit 33, configured to determine a spreading code according to the information in the transmission time slice after the demapping, and obtain a corresponding modulation bit according to the determined spreading code;
and a signal output unit 34 for obtaining an output signal based on the index bit and the modulation bit.
Wherein, when the demapping operation is performed, the time-chip index demapping unit 32 and the spreading code demapping unit 33 may be simultaneously performed to achieve the simultaneous time-chip index demapping and spreading code demapping. In another embodiment, the time-slice index demapping unit 32 and the spreading code demapping unit 33 may be sequentially performed to achieve time-slice index demapping and spreading code demapping.
In one possible implementation, the signal detection unit 31 is specifically configured to:
coherent and/or incoherent detection is performed on the signal of the power line channel 2.
In one implementation, the time slice index demapping unit 32 is specifically configured to:
the analog signal is demapped based on a maximum likelihood criterion or a maximum a posteriori probability criterion.
Based on the transmitting module 1 according to the above embodiment of the present invention, the present invention also provides a spread spectrum communication method based on a power line, which is applied to the transmitting module 1.
As shown in fig. 2, a spread spectrum communication method based on a power line according to an embodiment of the present invention includes:
step S1, dividing information to be transmitted into a plurality of information blocks, wherein each information block comprises index bits and modulation bits, and the sum of the index bits and the modulation bits is equal to the bit number of the corresponding information block;
step S2, mapping the index bit into a transmitting time slice and mapping the modulation bit into a spreading code;
and step S3, generating an analog signal according to the transmitting time slice and the spreading code, and transmitting the analog signal through a power line channel 2.
In one implementation manner, the mapping the index bits to the transmission slots includes:
mapping the index bits into transmit time slices according to the following quantitative relationship:
wherein p is 2 For the number of index bits, N is the total number of transmit slots, N s For the number of transmit time slices mapped,representing a downward rounding function, and C (·) represents a binomial coefficient.
In one implementation manner, the dividing the information to be transmitted into a plurality of information blocks includes:
the number of index bits in each of the information blocks is made the same as the number of modulation bits.
In one implementation manner, the generating an analog signal according to the transmitting time slice and the spreading code specifically includes:
generating a pulse signal or a continuous wave signal according to the transmitting time slice and the spreading code.
Based on the receiving module 3 according to the above embodiment of the present invention, the present invention also provides a spread spectrum communication method based on a power line, which is applied to the receiving module 3.
As shown in fig. 3, a spread spectrum communication method based on a power line according to an embodiment of the present invention includes:
step S10, obtaining an analog signal, wherein the analog signal is a pulse signal or a continuous wave signal;
step S20, demapping the analog signal, obtaining index bits according to the obtained transmission time slices, determining a spreading code according to the information in the transmission time slices after the demapping, and obtaining corresponding modulation bits according to the determined spreading code;
and step S30, obtaining an output signal according to the index bit and the modulation bit.
In one implementation, the acquiring the analog signal includes:
coherent and/or incoherent detection is performed on the signal of the power line channel 2.
In one implementation, the demapping the analog signal includes:
the analog signal is demapped based on a maximum likelihood criterion or a maximum a posteriori probability criterion.
According to the embodiment of the invention, the time slice position of the transmitted signal is determined through the time slice index, and the time slice index is utilized to carry additional information bits, so that the interference generated by other nodes in the system is reduced while the communication rate is improved, and the signal-to-noise ratio of the transmitted signal is improved by mapping the modulation bits into the spreading codes, thereby effectively realizing high-rate reliable power line communication as a whole.
In the several embodiments provided herein, it should be understood that the disclosed systems, modules, and methods may be implemented in other manners. For example, the above-described module embodiments are merely illustrative, and for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (12)
1. A spread spectrum communication method based on a power line, which is applied to a transmitting module and a receiving module, and comprises the following steps:
the method comprises the steps that a signal to be transmitted is divided into a plurality of information blocks by a transmitting module, a plurality of bits are selected from the initial position of segmentation information of the corresponding information blocks to serve as index bits, the remaining bits serve as modulation bits, and accordingly each information block comprises index bits and modulation bits, and the sum of the index bits and the modulation bits is equal to the bit number of the corresponding information block; mapping the index bits to transmit time slices and mapping the modulation bits to spreading codes; generating an analog signal according to the transmitting time slice and the spreading code, and transmitting the analog signal through a power line channel;
the receiving module acquires the analog signal, wherein the analog signal is a pulse signal or a continuous wave signal; demapping the analog signal, obtaining index bits according to the obtained transmission time slices, determining a spreading code according to the information in the transmission time slices after the demapping, and obtaining corresponding modulation bits according to the determined spreading code; and obtaining an output signal according to the index bit and the modulation bit.
2. The power line-based spread spectrum communication method according to claim 1, wherein the mapping the index bit into a transmission time slice comprises:
mapping the index bits into transmit time slices according to the following quantitative relationship:
；
in the method, in the process of the invention,for the number of index bits, +.>For the total number of transmit time slices, +.>For the number of transmit time slices mapped,representing a downward rounding function,/->Representing the binomial coefficients.
3. The power line-based spread spectrum communication method according to claim 1, wherein the dividing the signal to be transmitted into a plurality of information blocks comprises:
the number of index bits in each of the information blocks is made the same as the number of modulation bits.
4. The spread spectrum communication method based on power line according to claim 1, wherein said generating analog signals from said transmission time slices and said spreading codes is specifically:
generating a pulse signal or a continuous wave signal according to the transmitting time slice and the spreading code.
5. The power line based spread spectrum communication method as set out in claim 1, wherein said obtaining said analog signal comprises:
coherent and/or incoherent detection is performed on the signal of the power line channel.
6. The power line based spread spectrum communication method according to claim 1, wherein said demapping the analog signal comprises:
the analog signal is demapped based on a maximum likelihood criterion or a maximum a posteriori probability criterion.
7. A spread spectrum communication system based on a power line, comprising: the device comprises a sending module, a power line channel and a receiving module;
the sending module specifically comprises: a bit allocation unit, configured to divide a signal to be transmitted into a plurality of information blocks, select a plurality of bits from a start position of segmentation information of a corresponding information block as index bits, and use the remaining bits as modulation bits, so that each information block includes index bits and modulation bits, and a sum of the index bits and the modulation bits is equal to a bit number of the corresponding information block; a time slice index mapping unit, configured to map the index bits to a transmission time slice; a spreading code mapping unit, configured to map the modulation bits into a spreading code; a transmission signal generating unit, configured to generate an analog signal according to the transmission time slice and the spreading code, and transmit the analog signal through a power line channel;
the receiving module specifically comprises:
the signal detection unit is used for acquiring an analog signal, wherein the analog signal is a pulse signal or a continuous wave signal; the time slice index demapping unit is used for demapping the analog signal and obtaining index bits according to the obtained transmission time slices; a spreading code demapping unit, configured to determine a spreading code according to the information in the transmission time slice after the demapping, and obtain a corresponding modulation bit according to the determined spreading code; and the signal output unit is used for obtaining an output signal according to the index bit and the modulation bit.
8. The spread spectrum communication system based on power line according to claim 7, wherein the time slice index mapping unit is specifically configured to:
mapping the index bits into transmit time slices according to the following quantitative relationship:
；
in the method, in the process of the invention,for the number of index bits, +.>For the total number of transmit time slices, +.>For the number of transmit time slices mapped,representing a downward rounding function,/->Representing the binomial coefficients.
9. The spread spectrum communication system based on power line according to claim 7, wherein said bit allocation unit is specifically configured to:
when a signal to be transmitted is divided into a plurality of information blocks, the number of index bits in each information block is made the same as the number of modulation bits.
10. The spread spectrum communication system based on power line according to claim 7, wherein the transmission signal generating unit is specifically configured to:
generating a pulse signal or a continuous wave signal according to the transmitting time slice and the spreading code.
11. The spread spectrum communication system based on power line according to claim 7, wherein the signal detection unit is specifically configured to:
coherent and/or incoherent detection is performed on the signal of the power line channel.
12. The spread spectrum communication system based on power line according to claim 7, wherein the time slice index demapping unit is specifically configured to:
the analog signal is demapped based on a maximum likelihood criterion or a maximum a posteriori probability criterion.
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| US8223880B2 (en) * | 2005-03-16 | 2012-07-17 | Analog Devices, B.V. | System and method for power line communication |
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