CN104518844A - Method and device for cascaded channel coding applied in narrow band-power line communication - Google Patents
Method and device for cascaded channel coding applied in narrow band-power line communication Download PDFInfo
- Publication number
- CN104518844A CN104518844A CN201310452038.8A CN201310452038A CN104518844A CN 104518844 A CN104518844 A CN 104518844A CN 201310452038 A CN201310452038 A CN 201310452038A CN 104518844 A CN104518844 A CN 104518844A
- Authority
- CN
- China
- Prior art keywords
- symbol
- encoded piece
- mapping relations
- single encoded
- coding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0064—Concatenated codes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/542—Systems for transmission via power distribution lines the information being in digital form
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Error Detection And Correction (AREA)
Abstract
The invention discloses a method and a device for cascaded channel coding applied in narrow band-power line communication. RS coding is performed according to the minimum length of a single symbol which conforms to specific mapping relation, so that burst pulse resistant capability of the RS coding method is good. Thus, problems in the prior art that the error-correcting coding capability of a second-level cascaded channel coding method used in a NB-PLC system cannot resist interference of relatively strong burst pulse on the channel of the NB-PLC system are solved.
Description
Technical field
The present invention relates to arrowband power line communication (Narrow Band-Power Line Communication, NB-PLC) technical field, particularly relate to and be a kind ofly applied to cascaded channel coding method in NB-PLC and device.
Background technology
In NB-PLC system, severe channel condition is the maximum hindering factor improving message transmission rate and ensure transmission quality.
At present, NB-PLC system operates mainly in the frequency range of 3-500kHz, and the multipath that its channel becomes primarily of slow, coloured noise, arrowband interference, impulse disturbances, the periodic noise being synchronized with power frequency and the periodic noise being asynchronous to power frequency form.Wherein, the impulse disturbances being synchronized with power frequency and the impulse disturbances being asynchronous to power frequency can be classified as in the arrowband interference of frequency domain and the burst interference of time domain.In the low-frequency range channel of NB-PLC system, the arrowband interference of frequency domain is very serious; Meanwhile, make an uproar at the bottom of the strength ratio the produced burst interference of the time domain exceeding 10-15dB of the lack of standard of the electrical equipment on power line and causing also can make the channel condition of NB-PLC system become abnormal severe.
In order to the burst of the arrowband interference and time domain that reduce frequency domain disturbs the impact produced the channel of NB-PLC system, International Telecommunication Union (International Telecommunications Union, ITU) specifies in the agreement of its ITU G.9955 this version: the chnnel coding of NB-PLC system adopts two-level concatenation chnnel coding.Particularly, this two-level concatenation chnnel coding is made up of interior coding and outer coding, outer coding adopt be brachymemma Read-Solomon (Reed-solomon, RS) coding, and interior coding adopt be convolutional encoding.In addition, ITU G.9955 in adopt the length of the single symbol obtained coded by above-mentioned RS coding to be 8 (bit).
According to the above-mentioned two-level concatenation chnnel coding that G.9955 ITU specifies, can realize utilizing outer coding to correct a small amount of burst error, and in utilizing, coding corrects a small amount of random error.But, the interference that expection is often compared in the burst interference that the channel of NB-PLC system is subject in practice is stronger, thus the error correction coding ability of the above-mentioned two-level concatenation channel coding method adopting ITU G.9955 to specify in this agreement often can not resist the interference that stronger burst produces the channel of NB-PLC system.
Summary of the invention
The embodiment of the present invention provides a kind of and is applied to cascaded channel coding method in arrowband power line communication and device, and the error correction coding ability in order to solve the two-level concatenation channel coding method that NB-PLC system of the prior art adopts can not resist the problem of stronger burst to the interference that the channel of NB-PLC system produces.
The embodiment of the present invention is by the following technical solutions:
First aspect, a kind of cascaded channel coding method be applied in arrowband power line communication is provided, comprise: according to expectation code check burst being carried out to Read-Solomon RS coding, and the predetermined number of symbol that the check digit in single encoded piece that obtains after described RS coding comprises, determine the minimum number of the described single encoded piece of symbol comprised of satisfied first mapping relations; Wherein, described first mapping relations be described expectation code check, mapping relations between described predetermined number and the number three of the described single encoded piece of symbol comprised; According to the second mapping relations between the length of the single symbol in the number of the described single encoded piece of symbol comprised and described single encoded piece, determine the length of the described single symbol that the minimum number of the described single encoded piece of symbol comprised maps; Wherein, described second mapping relations meet: the length of described single symbol increases along with the increase of the number of the single encoded piece of symbol comprised; According to the minimum number of described expectation code check, the described single encoded piece of symbol comprised and the length of described symbol determined, RS coding is carried out to described burst, obtains each encoding block; Carry out interweaving between code block to described each encoding block, obtain each encoding block after interweaving; According to sequence, convolutional encoding is carried out to the symbol of each encoding block after described intertexture, obtains the data sequence after convolutional encoding.
In conjunction with first aspect, in the implementation that the first is possible, described second mapping relations are shown below:
Wherein, J is the length of described single symbol, and n is total number of the described single encoded piece all symbols comprised.
In conjunction with the first possible implementation of first aspect or first aspect, in the implementation that the second is possible, described first mapping relations are shown below:
n-rn≥R
Wherein, r is described expectation code check; R is described predetermined number; N is total number of the described single encoded piece all symbols comprised.
In conjunction with first aspect, or the implementation that the first or the second of first aspect are possible, in the implementation that the third is possible, described method also comprises: the data sequence after convolutional encoding be modulated in the channel of arrowband electric line communication system and send.
In conjunction with first aspect, or the first of first aspect is to any one implementation in the third possible implementation, and in the 4th kind of possible implementation, described predetermined number is 4.
Second aspect, a kind of cascaded channel code device be applied in arrowband power line communication is provided, comprise: minimum number determining unit, for basis, burst is carried out to the expectation code check of Read-Solomon RS coding, and the predetermined number of symbol that the check digit in single encoded piece that obtains after described RS coding comprises, determine the minimum number of the described single encoded piece of symbol comprised of satisfied first mapping relations; Wherein, described first mapping relations be described expectation code check, mapping relations between described predetermined number and the number three of the described single encoded piece of symbol comprised; Symbol lengths determining unit, for according to the second mapping relations between the length of the single symbol in the number of the described single encoded piece of symbol comprised and described single encoded piece, determine the length of the described single symbol that the minimum number of the described single encoded piece of symbol comprised maps; Wherein, described second mapping relations meet: the length of described single symbol increases along with the increase of the number of the single encoded piece of symbol comprised; Reed solomon product code unit, for according to the minimum number of described expectation code check, the described single encoded piece of symbol comprised and the length of described symbol determined, carries out RS coding to described burst, obtains each encoding block; Interleave unit, for carrying out interweaving between code block to described each encoding block, obtains each encoding block after interweaving; Convolutional encoding unit, for carrying out convolutional encoding to the symbol of each encoding block after described intertexture according to sequence, obtains the data sequence after convolutional encoding.
In conjunction with second aspect, in the implementation that the first is possible, described second mapping relations are shown below:
Wherein, J is the length of described single symbol, and n is total number of the described single encoded piece all symbols comprised.
In conjunction with second aspect, or the first possible implementation of second aspect, in the implementation that the second is possible, described first mapping relations are shown below:
n-rn≥R
Wherein, r is described expectation code check; R is described predetermined number; N is total number of the described single encoded piece all symbols comprised.
In conjunction with the implementation that the first or the second of second aspect or second aspect are possible, in the implementation that the third is possible, described device also comprises:
Modulation and transmitting element, for the data sequence after convolutional encoding is modulated to arrowband electric line communication system channel in send.
In conjunction with second aspect, or the first of second aspect is to any one implementation in the third possible implementation, and in the 4th kind of possible implementation, described predetermined number is 4.
The beneficial effect of the embodiment of the present invention is as follows:
Because the mapping relations of the number of the single encoded piece of symbol comprised set in the embodiment of the present invention and the length of single symbol meet: the length of single symbol increases along with the number increase of the single encoded piece of symbol comprised, reduce and reduce, therefore, the length of the single symbol determined according to the minimum number of the single encoded piece of symbol comprised in the embodiment of the present invention is the minimum length of the single symbol meeting above-mentioned mapping relations.Because RS coded system antagonism burst quantitatively can be determined by ineffectivity evaluation function the ability of the interference that the channel of NB-PLC system produces, the length of single symbol is less, the value of this ineffectivity evaluation function is less, and the ability of corresponding RS coded system antagonism burst is stronger.Therefore, the scheme that the embodiment of the present invention provides carries out RS coding according to the minimum length of the single symbol meeting above-mentioned mapping relations, and the ability of RS coded system antagonism burst can be made stronger.Simultaneously, the embodiment of the present invention is also improved two-level concatenation channel coding method of the prior art, between RS coding and convolutional encoding, add the processing mode of intertexture, thus the ability of the encoding block antagonism burst interference obtained after convolutional encoding can be improved further.
Accompanying drawing explanation
Fig. 1 carries out two-level concatenation channel coding process schematic diagram to burst in the NB-PLC system of ITU regulation G.9955;
Between RS coding and convolutional encoding, transmitting terminal and the receiving terminal schematic diagram of intertexture is added in the cascaded channel coded system that Fig. 2 provides for the embodiment of the present invention;
The idiographic flow schematic diagram of a kind of cascaded channel coding method be applied in NB-PLC that Fig. 3 provides for the embodiment of the present invention;
Fig. 4 to carry out the contrast schematic diagram of the error rate BER of RS coding to burst for the method that conventionally provides with the embodiment of the present invention respectively;
Fig. 5 to carry out the contrast schematic diagram of the bLock error rate BLER of RS coding to burst for the method that conventionally provides with the embodiment of the present invention respectively;
The concrete structure schematic diagram of a kind of cascaded channel code device be applied in NB-PLC that Fig. 6 provides for the embodiment of the present invention;
Fig. 7 is applied to the concrete structure schematic diagram of the cascaded channel code device in NB-PLC for another kind that the embodiment of the present invention provides.
Embodiment
According to ITU regulation G.9955, in NB-PLC system, two-level concatenation channel coding process is carried out as shown in Figure 1 to burst.As shown in Figure 1, this channel coding process is completed by two encoders, and they are outer code coder and interior code coder respectively.Wherein, the coded system that outer code coder adopts can be encoded for RS, and the coded system that interior code coder adopts can be convolution coding.
For Fig. 1, the burst supposing to input outer code coder be one comprise k symbol (ITU G.9955 in, the length of single symbol is 8bit, i.e. 1 byte) block of information, so, after outer code coder carries out RS coding to this burst, the encoding block that comprises n symbol can be obtained, n=k+R; Further, after interior code coder carries out convolutional encoding to this encoding block, forward error correction (Forward Error Correction, FEC) code word can be obtained.Wherein, the number of symbol that comprises for the check digit comprised in encoding block of R.
Encoding block is as shown in Figure 1 when correcting random error, and the byte number of the code word that can correct is t=R/2.Said t is also referred to as the error correcting capability of encoding block for random error herein.Usually, the encoding block varied in size has different t.Particularly, according to ITU regulation G.9955, the length R of block of information size, convolution code code check, check digit and the corresponding relation of t can see table 1.
Table 1:
As can be seen from upper table 1, for the block of information of specific size, R corresponding thereto can be chosen according to this table.
Such as, when block of information size is k=239Bytes, can determine that corresponding R is 16Bytes according to upper table 1, thus have n=239+16=255Bytes, corresponding RS encoder bit rate is
in concrete RS cataloged procedure, because the block of information size of required transmission is not fixed, therefore when burst is longer, need to carry out brachymemma according to the rule in agreement to burst, then, again according to length (unit of this length the is bit) J of single symbol during the RS coding specified in k and ITUG.9955, RS coding is carried out to each block of information obtained by carrying out brachymemma to burst, thus obtains the encoding block of length for (k+R) Bytes.It should be noted that, the ITU G.9955 middle J adopted is 1Byte, i.e. 8 bit, thus the encoding block that length is 255Bytes comprises 255 symbols.
Error correction coding ability due to two-level concatenation channel coding method as shown in Figure 1 can not resist the problem of stronger burst to the interference that the channel of NB-PLC system produces, therefore first the embodiment of the present invention is improved the two-level concatenation channel coding method shown in Fig. 1, obtains a kind of novel cascaded channel coded system.As shown in Figure 2, it encodes at RS and adds this processing mode that to interweave between code block between convolutional encoding the schematic diagram of this novel cascaded channel coded system except comprising RS coding and convolutional encoding.Particularly, intertexture can be performed by block interleaver or convolutional deinterleaver etc.
For cascaded channel coded system as shown in Figure 2, to encode the encoding block that the obtains error correcting capability t=(n-k for random error through RS)/2*J (bit), the correction capability b=(t-1 for burst error) J+1 (bit).Although add the interleaver that interleave depth is I in Fig. 2 between outer code coder (hereinafter claiming RS encoder) as shown in Figure 1 and interior code coder (hereinafter claiming encoder for convolution codes), but when there is burst in channel, after folding coding, still may there is burst error.Due to generally, mistake code word starting position with RS coding is carried out to burst after the starting position of any symbol in the encoding block that obtains all not exclusively overlap, the burst length (bit number) that therefore RS encoder as shown in Figure 2 and interleaver can be corrected is:
L
1＝bI+(I-1)(J-1)＝ItJ-J+1 [1]
And when certain the sign-on position in the encoding block obtained after being caused the wrong code word starting position of generation by single burst and carrying out RS coding to burst overlaps, the maximum number bits L2 of the burst error length that RS coding and intertexture cascade can be corrected can [2] calculate according to the following equation:
L
2＝bI+I(J-1)＝ItJ [2]
According to formula [1] and formula [2], an ineffectivity evaluation function μ evaluated for the ability of the single encoded piece of antagonism burst interference exported interleaver can be set.The mode that embodies of this ineffectivity evaluation function μ can as shown in the formula shown in [3]:
From the account form of μ, μ can represent the ineffectivity of decoding.μ is less, and this ineffectivity is less, and the ability of single encoded piece of antagonism burst interference is stronger; Otherwise μ is larger, this ineffectivity is larger, and the ability of single encoded piece of antagonism burst interference is more weak.
From formula [3], when code check r=k/n and interleave depth I immobilizes, the ineffectivity of decoding can reduce along with the reduction of J.
According to the above-mentioned relation between μ and the J summed up, on the basis of the cascaded channel coded system shown in Fig. 2, the embodiment of the present invention is improved the RS coding that RS encoder adopts further, make the RS after improving encode symbol in the encoding block that obtains the no longer fixing employing ITU of length J G.9955 in the length (8bit) of J, but adopt shorter length as far as possible.
To sum up, by the improvement to two-level concatenation chnnel coding of the prior art, embodiments provide a kind of cascaded channel coding method be applied in NB-PLC, the idiographic flow schematic diagram of the method as shown in Figure 3, comprises the steps:
Step 31, according to predetermined number R burst being carried out to the symbol that the expectation code check r of RS coding and the check digit after RS coding in obtain single encoded piece comprise, determine the minimum number n ' of this single encoded piece of symbol comprised of satisfied first mapping relations;
Wherein, the first mapping relations mentioned here are as shown in the formula shown in [4] and formula [5]:
n-k≥R [5]
Because total number n of this single encoded piece all symbols comprised meeting above-mentioned first mapping relations likely has multiple value, the minimum number n ' of this single encoded piece of symbol comprised therefore can be determined further according to following formula [6]:
In the embodiment of the present invention, the first mapping relations can also as shown in the formula shown in [7]:
n(1-r)＝R [7]
Because the n calculated according to formula [7] only has one, therefore under this scene, there is n '=n.
Step 32, according to second mapping relations of the above-mentioned number n of the single encoded piece of symbol comprised and the length J of symbol, determines the length J of the symbol that the minimum number n ' of the single encoded piece of symbol comprised maps;
In the embodiment of the present invention, second mapping relations of n and J can as shown in the formula shown in [8]:
Using n ' as n, substitute into above-mentioned computing formula, namely can calculate J.
Step 33, according to the length J of the symbol that expectation code check r, the minimum number n ' determined and this minimum number n ' map, carries out RS coding to burst, obtains each encoding block;
Such as, using n ' as n, above-mentioned formula [4] can be substituted into and calculates k.
Step 34, carries out the symbol interleaving between code block to each encoding block obtained by performing step 33, obtains the encoding block after interweaving;
Step 35, after carrying out convolutional encoding to each encoding block after intertexture according to bit, obtain the data sequence after convolutional encoding, so far chnnel coding flow process terminates;
Step 36, can further according to the modulation system of regulation, and the data sequence after convolutional encoding be modulated in the channel of NB-PLC system, flow process terminates.
Because the mapping relations of the number of the single encoded piece of symbol comprised set in the embodiment of the present invention and the length of symbol meet: the length of single symbol increases along with the number increase of the single encoded piece of symbol comprised, reduce and reduce, therefore, determine that the length of single symbol is the minimum length of the single symbol meeting these mapping relations according to the minimum number of the single encoded piece of symbol comprised calculated in the embodiment of the present invention.Because RS coded system antagonism burst quantitatively can be determined by ineffectivity evaluation function the ability of the interference that the channel of NB-PLC system produces, the length of symbol is less, this ineffectivity evaluation function less, the ability of corresponding RS coded system antagonism burst is stronger.Therefore, the scheme that the embodiment of the present invention provides carries out RS coding according to the minimum length of the symbol meeting above-mentioned mapping relations, and the ability of RS coded system antagonism burst can be made stronger.Simultaneously, the embodiment of the present invention is also improved two-level concatenation channel coding method of the prior art, between RS coding and convolutional encoding, add the processing mode of intertexture, thus the ability of the encoding block antagonism burst interference obtained after convolutional encoding can be improved further.
Below by way of the description of a kind of embodiment of the said method provided the embodiment of the present invention, describe the said method application process in practice that the embodiment of the present invention provides in detail.
For ITU G.9955 in regulation RS coding range of code rates [0.863-0.93], before burst is encoded, can choose from this range of code rates a code check as expection code check.Such as, in this embodiment, suppose to choose code check r=0.91.
After determining expection code check, according to following table 2, the number R of the symbol that the check digit corresponding with this code check comprises can be chosen.It should be noted that, the concrete numerical value of the R in this table 2 can be the empirical value obtained by adding up some historical datas in the RS cataloged procedure in NB-PLC system; K and J needs to carry out by previously described respective formula the unknown number that calculates.The value corresponding to k and J of different r specifically calculated also can see table 2.
Table 1:
In this embodiment, determining r=0.91, after R=4, according to previously described formula [4] and formula [7], n '=45 can be calculated, k '=41, thus can using value substitution formula [8] of the value of n ' as n, the length calculating single symbol is
so far, just define required parameter when RS coding carries out to burst, thus can those parameter n '=45, k '=41 and J=6, RS coding is carried out to burst and obtains each encoding block.
Then, further each encoding block above-mentioned is carried out block interleaving that interleave depth is I or convolutional interleave, obtain the encoding block after interweaving; Finally, utilize convolution coder to carry out to the encoding block after intertexture the convolutional encoding that code check is 1/2 or 2/3, obtain the encoding block after convolutional encoding, so far chnnel coding terminates.
Below introduce scheme that the embodiment of the present invention the provides beneficial effect compared to prior art:
By the technical scheme that the embodiment of the present invention provides, adopt RS coding+intertexture+convolutional encoding as channel cascaded chnnel coding, the ability of NB-PLC system counter burst interference can be improved, NB-PLC systematic function is promoted, and make the error rate (Bit Error Ratio, BER) all decrease with bLock error rate (Block ErrorRatio, BLER).Prove that the experimental data that the technical scheme that the embodiment of the present invention provides can make BER and BLER all reduce is as follows:
Utilize the burst that length is 137Bytes to test, according to ITU regulation G.9955, can find out that this data block can add 16 redundancy checks when RS encodes by table one, namely coded signal length is 153Bytes, thus n=153, k=137, J=8 in the protocol.Now the code check of RS coding is
And according to the method that the embodiment of the present invention provides, suppose to adopt r=0.895, n-k=4 so can calculate n '=38, k '=34, J=6bit.The burst length to be encoded of input is 1096bit, and the length of single symbol is 6bit, and the single encoded piece of symbolic number comprised is 34, therefore, can calculate the information sequence of input altogether
block, obtains through RS coding the encoding block that 6 block sizes are 38 symbols.Suppose that follow-up is 6 to carry out according to interleave depth when interweaving to encoding block, i.e. I=6, the then value of corresponding ineffectivity evaluation function
In the embodiment of the present invention, respectively to BER and BLER according to arrowband power line communication prior art, burst being carried out to RS coding, and according to the method that the embodiment of the present invention provides, BER and BLER that burst carries out RS coding is emulated, delineate the contrast schematic diagram as Fig. 4 and Fig. 5.
In coordinate system shown in Fig. 4, abscissa represents the signal to noise ratio (Signal to NoiseRatio, SNR) of burst, and ordinate represents BER.The line including the little rectangle of black represents the change trend of BER along with the different signal to noise ratios of burst of conventionally burst being carried out to RS coding, and include BER that the little leg-of-mutton line of black represents that the method provided according to the embodiment of the present invention carries out RS coding to burst along with burst different signal to noise ratios variation tendency.
In coordinate system shown in Fig. 5, abscissa represents the SNR of burst, and ordinate represents BLER.The line including the little rectangle of black represents the variation tendency of BLER along with the different signal to noise ratios of burst of conventionally burst being carried out to RS coding, and include BLER that the little leg-of-mutton line of black represents that the method provided according to the embodiment of the present invention carries out RS coding to burst along with burst different signal to noise ratios variation tendency.
As can be seen from Fig. 4 and Fig. 5, encode compared to RS of the prior art, the coding efficiency of the RS coding adopting the present embodiment to provide can promote about 1dB when SNR is greater than 3dB.
The identical inventive concept of cascaded channel coding method in arrowband power line communication is applied to for what provide with the embodiment of the present invention, the embodiment of the present invention also provides a kind of cascaded channel code device be applied in arrowband power line communication, the concrete structure schematic diagram of this device as shown in Figure 6, mainly comprises following functions unit:
Minimum number determining unit 61, for basis, burst is carried out to the expectation code check of RS coding, and the predetermined number of symbol that the check digit after RS coding in obtain single encoded piece comprises, determine the minimum number of the single encoded piece of symbol comprised of satisfied first mapping relations; Wherein, the first mapping relations are expect code check, mapping relations between predetermined number and the number three of the single encoded piece of symbol comprised;
Symbol lengths determining unit 62, for the single symbol in the number of symbol that comprises according to single encoded piece and single encoded piece length between the second mapping relations, determine the length of the single symbol that the minimum number of the single encoded piece of symbol comprised maps; Wherein, the second mapping relations meet: the length of single symbol increases along with the increase of the number of the single encoded piece of symbol comprised;
Reed solomon product code unit 63, for according to the minimum number expecting code check, the single encoded piece of symbol comprised and the length of symbol determined, carries out RS coding to burst, obtains each encoding block;
Interleave unit 64, interweaves between code block for carrying out each encoding block, obtains each encoding block after interweaving;
Convolutional encoding unit 65, for carrying out convolutional encoding to the symbol of each encoding block after intertexture according to sequence, obtains the data sequence after convolutional encoding.
Optionally, above-mentioned second mapping relations can be shown below:
Wherein, J is the length of single symbol, and n is total number of the single encoded piece of all symbols comprised.
Optionally, the first mapping relations can be shown below:
n-rn≥R
Wherein, r is for expecting code check; The predetermined number of the symbol that R comprises for the check digit in obtain single encoded piece after RS coding; N is total number of the single encoded piece of all symbols comprised.Particularly, R can be 4.
Optionally, this device that the embodiment of the present invention provides can also comprise: modulation and transmitting element, for the data sequence after convolutional encoding is modulated to arrowband electric line communication system channel in send.
The identical inventive concept of cascaded channel coding method in arrowband power line communication is applied to for what provide with the embodiment of the present invention, the embodiment of the present invention also provides another kind to be applied to cascaded channel code device in arrowband power line communication, the concrete structure schematic diagram of this device as shown in Figure 7, mainly comprises following functions entity:
Processor 71, for basis, burst is carried out to the expectation code check of RS coding, and the predetermined number of symbol that the check digit in single encoded piece that obtains after described RS coding comprises, determine the minimum number of the described single encoded piece of symbol comprised of satisfied first mapping relations; And according to the second mapping relations between the length of the single symbol in the number of the described single encoded piece of symbol comprised and described single encoded piece, determine the length of the described single symbol that the minimum number of the described single encoded piece of symbol comprised maps; Wherein, the first mapping relations be described expectation code check, mapping relations between described predetermined number and the number three of the described single encoded piece of symbol comprised; Second mapping relations meet: the length of described single symbol increases along with the increase of the number of the single encoded piece of symbol comprised;
RS encoder 72, for according to the minimum number of described expectation code check, the described single encoded piece of symbol comprised and the length of described symbol determined, carries out RS coding to described burst, obtains each encoding block;
Interleaver 73, for carrying out interweaving between code block to described each encoding block, obtains each encoding block after interweaving;
Convolution coder 74, for carrying out convolutional encoding to the symbol of each encoding block after described intertexture according to sequence, obtains the data sequence after convolutional encoding.
Optionally, this device can further include modulator-demodulator, its for the data sequence after convolutional encoding is modulated to arrowband electric line communication system channel in send.
Because the mapping relations of the number of the single encoded piece of symbol comprised set in the embodiment of the present invention and the length of single symbol meet: the length of single symbol increases along with the number increase of the single encoded piece of symbol comprised, reduce and reduce, therefore, the length of the single symbol determined according to the minimum number of the single encoded piece of symbol comprised in the embodiment of the present invention is the minimum length of the single symbol meeting above-mentioned mapping relations.Because RS coded system antagonism burst quantitatively can be determined by ineffectivity evaluation function the ability of the interference that the channel of NB-PLC system produces, the length of single symbol is less, the value of this ineffectivity evaluation function is less, and the ability of corresponding RS coded system antagonism burst is stronger.Therefore, the scheme that the embodiment of the present invention provides carries out RS coding according to the minimum length of the single symbol meeting above-mentioned mapping relations, and the ability of RS coded system antagonism burst can be made stronger.Simultaneously, the embodiment of the present invention is also improved two-level concatenation channel coding method of the prior art, between RS coding and convolutional encoding, add the processing mode of intertexture, thus the ability of the encoding block antagonism burst interference obtained after convolutional encoding can be improved further.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. be applied to the cascaded channel coding method in arrowband power line communication, it is characterized in that, comprising:
According to expectation code check burst being carried out to Read-Solomon RS coding, and the predetermined number of symbol that the check digit in single encoded piece that obtains after described RS coding comprises, determine the minimum number of the described single encoded piece of symbol comprised of satisfied first mapping relations; Wherein, described first mapping relations be described expectation code check, mapping relations between described predetermined number and the number three of the described single encoded piece of symbol comprised;
According to the second mapping relations between the length of the single symbol in the number of the described single encoded piece of symbol comprised and described single encoded piece, determine the length of the described single symbol that the minimum number of the described single encoded piece of symbol comprised maps; Wherein, described second mapping relations meet: the length of described single symbol increases along with the increase of the number of the single encoded piece of symbol comprised;
According to the minimum number of described expectation code check, the described single encoded piece of symbol comprised and the length of described symbol determined, RS coding is carried out to described burst, obtains each encoding block;
Carry out interweaving between code block to described each encoding block, obtain each encoding block after interweaving;
According to sequence, convolutional encoding is carried out to the symbol of each encoding block after described intertexture, obtains the data sequence after convolutional encoding.
2. the method for claim 1, is characterized in that, described second mapping relations are shown below:
Wherein, J is the length of described single symbol, and n is total number of the described single encoded piece all symbols comprised.
3. method as claimed in claim 1 or 2, it is characterized in that, described first mapping relations are shown below:
n-rn≥R
Wherein, r is described expectation code check; R is described predetermined number; N is total number of the described single encoded piece all symbols comprised.
4. the method as described in as arbitrary in claims 1 to 3, it is characterized in that, described method also comprises:
Data sequence after convolutional encoding is modulated in the channel of arrowband electric line communication system and sends.
5. the method as described in as arbitrary in Claims 1 to 4, it is characterized in that, described predetermined number is 4.
6. be applied to the cascaded channel code device in arrowband power line communication, it is characterized in that, comprising:
Minimum number determining unit, for basis, burst is carried out to the expectation code check of Read-Solomon RS coding, and the predetermined number of symbol that the check digit in single encoded piece that obtains after described RS coding comprises, determine the minimum number of the described single encoded piece of symbol comprised of satisfied first mapping relations; Wherein, described first mapping relations be described expectation code check, mapping relations between described predetermined number and the number three of the described single encoded piece of symbol comprised;
Symbol lengths determining unit, for according to the second mapping relations between the length of the single symbol in the number of the described single encoded piece of symbol comprised and described single encoded piece, determine the length of the described single symbol that the minimum number of the described single encoded piece of symbol comprised maps; Wherein, described second mapping relations meet: the length of described single symbol increases along with the increase of the number of the single encoded piece of symbol comprised;
Reed solomon product code unit, for according to the minimum number of described expectation code check, the described single encoded piece of symbol comprised and the length of described symbol determined, carries out RS coding to described burst, obtains each encoding block;
Interleave unit, for carrying out interweaving between code block to described each encoding block, obtains each encoding block after interweaving;
Convolutional encoding unit, for carrying out convolutional encoding to the symbol of each encoding block after described intertexture according to sequence, obtains the data sequence after convolutional encoding.
7. device as claimed in claim 6, it is characterized in that, described second mapping relations are shown below:
Wherein, J is the length of described single symbol, and n is total number of the described single encoded piece all symbols comprised.
8. device as claimed in claims 6 or 7, it is characterized in that, described first mapping relations are shown below:
n-rn≥R
Wherein, r is described expectation code check; R is described predetermined number; N is total number of the described single encoded piece all symbols comprised.
9. the device as described in as arbitrary in claim 6 ~ 8, it is characterized in that, described device also comprises:
Modulation and transmitting element, for the data sequence after convolutional encoding is modulated to arrowband electric line communication system channel in send.
10. the device as described in as arbitrary in claim 6 ~ 9, it is characterized in that, described predetermined number is 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310452038.8A CN104518844B (en) | 2013-09-27 | 2013-09-27 | Applied to the cascaded channel coding method in arrowband power line communication and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310452038.8A CN104518844B (en) | 2013-09-27 | 2013-09-27 | Applied to the cascaded channel coding method in arrowband power line communication and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104518844A true CN104518844A (en) | 2015-04-15 |
| CN104518844B CN104518844B (en) | 2018-01-12 |
Family
ID=52793638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310452038.8A Active CN104518844B (en) | 2013-09-27 | 2013-09-27 | Applied to the cascaded channel coding method in arrowband power line communication and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104518844B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016179743A1 (en) * | 2015-05-08 | 2016-11-17 | 华为技术有限公司 | Encoding apparatus and method |
| CN114640390A (en) * | 2020-12-16 | 2022-06-17 | 诺基亚通信公司 | Optical network unit activation |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006014026A3 (en) * | 2004-08-05 | 2006-03-30 | Matsushita Electric Ind Co Ltd | Transmission apparatus and communication system using the same |
| CN102739339A (en) * | 2011-04-01 | 2012-10-17 | 杭州讯能科技有限公司 | Power line carrier communication method and system thereof |
| WO2013001706A1 (en) * | 2011-06-29 | 2013-01-03 | 日本電気株式会社 | Wireless transceiver device, communication system and channel-coding processing method used in same device and system |
-
2013
- 2013-09-27 CN CN201310452038.8A patent/CN104518844B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006014026A3 (en) * | 2004-08-05 | 2006-03-30 | Matsushita Electric Ind Co Ltd | Transmission apparatus and communication system using the same |
| CN102739339A (en) * | 2011-04-01 | 2012-10-17 | 杭州讯能科技有限公司 | Power line carrier communication method and system thereof |
| WO2013001706A1 (en) * | 2011-06-29 | 2013-01-03 | 日本電気株式会社 | Wireless transceiver device, communication system and channel-coding processing method used in same device and system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016179743A1 (en) * | 2015-05-08 | 2016-11-17 | 华为技术有限公司 | Encoding apparatus and method |
| CN114640390A (en) * | 2020-12-16 | 2022-06-17 | 诺基亚通信公司 | Optical network unit activation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104518844B (en) | 2018-01-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2661264C (en) | Method of correcting message errors using cyclic redundancy checks | |
| CA2698533A1 (en) | Multi-layer cyclic redundancy check code in wireless communication system | |
| KR19980064845A (en) | Coding and decoding system using seed check bits | |
| CN101636914A (en) | Method and apparatus for encoding and decoding data | |
| CN100592639C (en) | Low density parity check coding method, device and parity check matrix generating method | |
| US9716608B2 (en) | Multi-element code modulation mapping method, device and computer storage medium | |
| KR20210006807A (en) | Apparatus and method to transmit and receive signal in communication system | |
| EP4122102A1 (en) | List decoding of polarization-adjusted convolutional codes | |
| CN110890894A (en) | Method and apparatus for concatenated coding | |
| CN100488059C (en) | Component coder and coding method, double-output Turbo coder and coding method | |
| KR102520788B1 (en) | Channel state information encoding method and device, storage medium and processor | |
| CN114731166A (en) | Space coupling FEC coding method and equipment for component code using GEL code | |
| CN102150370A (en) | Systems and methods for providing unequal error protection using embedded coding | |
| CN104518844A (en) | Method and device for cascaded channel coding applied in narrow band-power line communication | |
| Mahajan et al. | Reed-Solomon code performance for M-ary modulation over AWGN channel | |
| CN102281076B (en) | RS (Reed-Solomon) cascade code design method based on increase of frequency hopping radio station anti-interference capabilities | |
| CN109412752A (en) | Noncoherent detection receiver, the system and method for polarization code | |
| Mahajan et al. | BER performance of Reed-Solomon code using M-ary FSK modulation in AWGN channel | |
| US11128320B2 (en) | Encoding method, decoding method, encoding apparatus, and decoding apparatus | |
| CN107342775B (en) | Viterbi decoding method for punctured convolutional code | |
| KR101456299B1 (en) | Method of interleaving in wireless communication system | |
| KR101570276B1 (en) | Method and apparatue for processing a signal in communication system | |
| Priyadharshini et al. | Performance analysis of Reed-Solomon codes in digital communication system using labview | |
| CN115706622A (en) | Data transmission method, device, equipment, system and readable storage medium | |
| KR100762134B1 (en) | Method of generating read address for block interleaving |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |