CN102202030B - Data transmission system and method suitable for wired and wireless fusion of AMI (Advanced Metering Infrastructure) - Google Patents
Data transmission system and method suitable for wired and wireless fusion of AMI (Advanced Metering Infrastructure) Download PDFInfo
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Abstract
The invention discloses a data transmission system and method suitable for wired and wireless fusion of an AMI (Advanced Metering Infrastructure). The system comprises a forward error correction coding part, a modulating part and an analog front end transmission part, wherein the forward error correction coding part is used for performing scrambling and RS (Reed-Solomon) coding processing on data to be transmitted, independently performing convolutional coding, interweaving and repeated coding on the data which are subjected to RS coding processing and a frame control header, and outputting to the modulating part; the modulating part is used for performing mapping, pilot frequency insertion, IFFT (Inverse Fast Fourier Transform), cyclic prefix insertion, precursor insertion, windowing and overlapping processing on repeatedly-coded data input by the forward error correction coding part according to a selected modulating mode, optionally performing up-conversion according to a transmission mode and outputting to the analog front end transmitting part; and the analog front end transmission part is used for choosing to transmit data input by the modulating part with a power line analog front end or a radiofrequency analog front end according to the setting of a transmission mode. By adopting the system and the method, flexible selection of a transmission scheme adapting to the environment and the channel property is realized.
Description
Technical field
The present invention relates to power line communication and wireless communication technology field, relate in particular to data transmission system and method that a kind of wire and wireless that is applicable to AMI of realizing based on the OFDM technology merges.
Background technology
Senior measurement system under the intelligent grid (Advanced Metering Infrastructure, AMI) comprises intelligent electric meter, network service, three systems of ammeter data management, and fixing bidirectional communication network is the basis of its whole senior application.
China's electrical network is huge and complicated, and channel circumstance is extremely abominable, and the characteristic of channel is different at different frequency range, different time, different location, low-frequency range especially, and industrial frequency noise, narrow-band noise etc. are disturbed very serious, have brought very large challenge to system.The dynamic random of wireless channel is very large, space electromagnetic interference and multipath serious interference.And OFDM (OFDM) technology has good anti-multipath noiseproof feature, and has very high spectrum utilization efficiency, the noise that can effectively resist the multipath effect in the CATV Distribution Net and be coupled into.Therefore in the communication of AMI, utilizing the OFDM technology to modulate becomes an optimal selection.
The existing communication mode that is used for AMI mainly can be divided into power line communication and radio communication.Power line communication mainly adopts single carrier narrowband modulation technology (such as FSK, BPSK, frequency hopping, direct sequence spread spectrum etc.) or multi-carrier modulation technology, wherein data rate is mostly below 10kbit/s under the single-carrier modulated technology, and data transfer rate can reach tens to hundreds of kbit/s under the OFDM multi-carrier modulation technology; Radio communication mainly adopts spread spectrum (such as ZigBee), and data rate is generally tens to hundreds of kbit/s.Wireless communication technology is ripe, fail safe is good, it is mobile to be convenient to, but is subject to that barrier stops, transmission range short; Power line communication technology utilizes existing electrical network to realize that cost is low, do not take existing frequency resource, do not have problem through walls, but the flexibility relative deficiency.
Summary of the invention
The technical problem that (one) will solve
In view of this, main purpose of the present invention is to provide a kind of data transmission system and method that merges based on the wire and wireless that is applicable to AMI of OFDM technology realization, to solve the deficiency of present prior art, the flexible choice of the transmission plan that realization and environment and the characteristic of channel adapt.
(2) technical scheme
For achieving the above object, the invention provides the data transmission system of the wire and wireless fusion of a kind of AMI of being applicable to, this system realizes based on the OFDM technology, comprising:
The forward error correction coding part is used for carrying out scrambling and the processing of RS coding to sent data, and data and the frame control head after the processing of RS coding is carried out independently convolutional encoding, interweaves and repeated encoding, then exports to modulating part;
Modulating part, data behind the repeated encoding that is used for according to the selected modulation pattern forward error correction coding partly being inputted shine upon, insert that pilot tone, IFFT, insertion Cyclic Prefix, insertion are leading, windowing and overlapping processing, form the base band physical frame, and according to selection is set whether carries out up-conversion of transmission mode, then export to the AFE (analog front end) transmitting portion; And
The AFE (analog front end) transmitting portion is used for selecting to adopt power line AFE (analog front end) or rf analog front-end to send the data of modulating part input according to arranging of transmission means.
In the such scheme, described forward error correction coding part is carried out scrambling and the processing of RS coding to sent data, and data and the frame control head after the processing of RS coding carried out independently convolutional encoding, interweaves and repeated encoding, specifically comprises:
Forward error correction coding part is carried out scrambling to sent data take byte as unit, and wherein the generation of scrambler is based at random PN sequence, and the generator polynomial of PN sequence is:
Process is carried out scrambling the data GF (2 afterwards
8) in brachymemma RS (N, K) encode, wherein N takes from 8 to 255 integer, K=N-8;
Data and frame control head after the processing of RS coding are carried out convolutional encoding independently, and the code check of convolution code is 1/2, constraint length k=7, and generator polynomial is respectively: G
1=171
Oct, G
2=133
Oct, after last bit of coding enters convolution coder, insert 60 as the ending bit, make convolution coder get back to nought state;
Data after the convolutional encoding and frame control head are carried out respectively interleaving treatment; And
Data after interweaving are carried out repeated encoding, and frame control head adopts 6 repeated encodings.
In the such scheme, described when the data after the convolutional encoding and frame control head are carried out interleaving treatment respectively, interleaver adopts the mode of advancing and listing, and adopts the circulation output with side-play amount during by row output, and side-play amount increases progressively by row; Described when the data after interweaving are carried out repeated encoding, data division adopts 4 repeated encodings under the ROBUST pattern, and data are not carried out repeated encoding under the non-ROBUST pattern, and this repeated encoding is with the whole repeatedly output of the data after interweaving.
In the such scheme, data behind the repeated encoding that described modulating part is partly inputted forward error correction coding according to the selected modulation pattern shine upon, insert pilot tone, IFFT, insertion Cyclic Prefix, it is leading to insert, windowing and overlapping processing, form the base band physical frame, and according to selection is set whether carries out up-conversion of transmission mode, specifically comprise:
Modulating part is carried out data-mapping and is inserted pilot tone according to the selected modulation pattern;
By 128 IFFT conversion, the data frequency domain data after the insertion pilot tone is transformed to time domain, form time-domain symbol;
Before the symbol that each IFFT generates, insert Cyclic Prefix;
Before first symbol that generates, insert leading symbol;
Each symbol is carried out windowing process;
Symbol after the windowing is carried out overlapping processing; And
Through above processing, formed a complex radical band physical frame, then according to selection is set whether carries out up-conversion of transmission means, if transmission means is wire transmission, then adopts Digital Up Convert that complex radical band physical frame is transferred to base band, otherwise do not carry out up-conversion.
In the such scheme, when described modulating part is carried out data-mapping and inserted pilot tone according to the selected modulation pattern, under ROBUST pattern and DBPSK pattern, data are carried out the DBPSK modulation, under the DQPSK pattern, data are carried out DQPSK and modulate; In the described IFFT conversion, IFFT is input as: 1～48 and 80～127 subcarriers input valid data, and other subcarrier is input as 0; Described when inserting Cyclic Prefix before the symbol that each IFFT generates, circulating prefix-length is 16 sampling points, and data are taken from the end of this symbol; Before described first symbol generating, when inserting leading symbol, leading symbol does not insert Cyclic Prefix, and targeting sequencing is formed by connecting by 9.5 symbol lengths leading symbols; It is described when each symbol is carried out windowing process, the rising edge of institute's windowing and trailing edge respectively account for the length of 4 sampling points, all adopt raised cosine roll-off function to produce, the afterbody that adds a rising window, last half symbols for a targeting sequencing head at first symbol adds a decline window; Described when the symbol after the windowing is carried out overlapping processing, overlapping 4 sampling points of former and later two intersymbols are for targeting sequencing only in the end half symbols place and thereafter first intersymbol overlapping 4 each sampling point.
In the such scheme, described AFE (analog front end) transmitting portion comprises power line AFE (analog front end) and rf analog front-end, wherein the power line AFE (analog front end) comprises digital to analog converter, low pass filter and transmission driver, and rf analog front-end comprises digital to analog converter, low pass filter, transmission driver and frequency mixer; Described power line AFE (analog front end) and described rf analog front-end multiplexing number weighted-voltage D/A converter, low pass filter and transmission driver, and the parameter of low pass filter and transmission driver is all configurable.
For achieving the above object, the data transmission method that the present invention also provides the wire and wireless of a kind of AMI of being applicable to merge comprises:
The forward error correction coding part is carried out scrambling and the processing of RS coding to sent data, and data and the frame control head after the processing of RS coding carried out independently convolutional encoding, interweaves and repeated encoding, then exports to modulating part;
Data behind the repeated encoding that modulating part is partly inputted forward error correction coding according to the selected modulation pattern shine upon, insert pilot tone, IFFT, insertion Cyclic Prefix, it is leading to insert, windowing and overlapping processing, form the base band physical frame, and according to selection is set whether carries out up-conversion of transmission mode, then export to the AFE (analog front end) transmitting portion; And
The AFE (analog front end) transmitting portion selects to adopt power line AFE (analog front end) or rf analog front-end to send the data of modulating part input according to arranging of transmission means.
In the such scheme, the method also comprised: system modulation pattern and transmission mode are set the forward error correction coding part is carried out the processing of scrambling and RS coding to sent data before.Described system modulation pattern and the transmission mode of arranging comprises:
The system modulation pattern is set: the system modulation pattern is divided into ROBUST pattern, DBPSK pattern, DQPSK pattern, and wherein under the ROBUST pattern, the data DBPSK modulates, and when repeated encoding, data are carried out repeated encoding 4 times; Under DBPSK pattern and DQPSK pattern, data adopt respectively DBPSK and DQPSK modulation, and when repeated encoding, data are not carried out repeated encoding;
System transmission mode is set: system transmission mode is divided into wire transmission pattern and wireless communication mode, adopt the arrowband power line channel to carry out transfer of data under the wherein wire transmission pattern, adopt the 470-510MHz wireless channel to carry out transfer of data under the wireless communication mode.
In the such scheme, described forward error correction coding part is carried out scrambling and the processing of RS coding to sent data, and data and the frame control head after the processing of RS coding carried out independently convolutional encoding, interweaves and repeated encoding, comprising:
Forward error correction coding part is carried out scrambling to sent data take byte as unit, and wherein the generation of scrambler is based at random PN sequence, and the generator polynomial of PN sequence is:
Process is carried out scrambling the data GF (2 afterwards
8) in brachymemma RS (N, K) encode, wherein N takes from 8 to 255 integer, K=N-8;
Data and frame control head after the processing of RS coding are carried out convolutional encoding independently, and the code check of convolution code is 1/2, constraint length k=7, and generator polynomial is respectively: G
1=171
Oct, G
2=133
Oct, after last bit of coding enters convolution coder, insert 60 as the ending bit, make convolution coder get back to nought state;
Data after the convolutional encoding and frame control head are carried out respectively interleaving treatment; And
Data after interweaving are carried out repeated encoding, and frame control head adopts 6 repeated encodings.
In the such scheme, described when the data after the convolutional encoding and frame control head are carried out interleaving treatment respectively, interleaver adopts the mode of advancing and listing, and adopts the circulation output with side-play amount during by row output, and side-play amount increases progressively by row; Described when the data after interweaving are carried out repeated encoding, data division adopts 4 repeated encodings under the ROBUST pattern, and data are not carried out repeated encoding under the non-ROBUST pattern, and this repeated encoding is with the whole repeatedly output of the data after interweaving.
In the such scheme, data behind the repeated encoding that described modulating part is partly inputted forward error correction coding according to the selected modulation pattern shine upon, insert pilot tone, IFFT, insertion Cyclic Prefix, it is leading to insert, windowing and overlapping processing, form the base band physical frame, and according to selection is set whether carries out up-conversion of transmission mode, comprising:
Modulating part is carried out data-mapping and is inserted pilot tone according to the selected modulation pattern;
By 128 IFFT conversion, the data frequency domain data after the insertion pilot tone is transformed to time domain, form time-domain symbol;
Before the symbol that each IFFT generates, insert Cyclic Prefix;
Before first symbol that generates, insert leading symbol;
Each symbol is carried out windowing process;
Symbol after the windowing is carried out overlapping processing; And
Through above processing, formed a complex radical band physical frame, then according to selection is set whether carries out up-conversion of transmission means, if transmission means is wire transmission, then adopts Digital Up Convert that complex radical band physical frame is transferred to base band, otherwise do not carry out up-conversion.
In the such scheme, when described modulating part is carried out data-mapping and inserted pilot tone according to the selected modulation pattern, under ROBUST pattern and DBPSK pattern, data are carried out the DBPSK modulation, under the DQPSK pattern, data are carried out DQPSK and modulate; In the described IFFT conversion, IFFT is input as: 1～48 and 80～127 subcarriers input valid data, and other subcarrier is input as 0; Described when inserting Cyclic Prefix before the symbol that each IFFT generates, circulating prefix-length is 16 sampling points, and data are taken from the end of this symbol; Before described first symbol generating, when inserting leading symbol, leading symbol does not insert Cyclic Prefix, and targeting sequencing is formed by connecting by 9.5 symbol lengths leading symbols; It is described when each symbol is carried out windowing process, the rising edge of institute's windowing and trailing edge respectively account for the length of 4 sampling points, all adopt raised cosine roll-off function to produce, the afterbody that adds a rising window, last half symbols for a targeting sequencing head at first symbol adds a decline window; Described when the symbol after the windowing is carried out overlapping processing, overlapping 4 sampling points of former and later two intersymbols are for targeting sequencing only in the end half symbols place and thereafter first intersymbol overlapping 4 each sampling point.
(3) beneficial effect
Can find out that from technique scheme the present invention has following beneficial effect:
1, data transmission system and the method that is applicable to the wire and wireless fusion of AMI provided by the invention, cable technology and wireless technology are merged realization, strengthened system suitability, can be according to need for environment and the characteristic of channel, be configured to wireless communication mode or wire transmission pattern, realized the flexible choice of the transmission plan that adapts with environment and the characteristic of channel.
2. the data transmission system and the method that merge of the wire and wireless that is applicable to AMI provided by the invention realizes based on the OFDM technology, strengthened system interference free performance, improved data transmission rate; By the baseband multiplex of wire and wireless, simplified design is saved cost.
Description of drawings
Fig. 1 is the structural representation of the data transmission system that merges of the wire and wireless of the AMI of being applicable to provided by the invention;
Fig. 2 is frame assumption diagram provided by the invention;
Fig. 3 is the interleaver structure chart according to the embodiment of the invention;
Fig. 4 is the subcarrier mapping schematic diagram according to the embodiment of the invention;
Fig. 5 is according to the IFFT of the embodiment of the invention and inserts the Cyclic Prefix schematic diagram;
Fig. 6 is the raised cosine window schematic diagram according to the embodiment of the invention;
Fig. 7 is according to the overlapping schematic diagram of the intersymbol of the embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
As shown in Figure 1, Fig. 1 is the structural representation of the data transmission system that merges of the wire and wireless of the AMI of being applicable to provided by the invention, and this system realizes based on the OFDM technology, comprises forward error correction coding part, modulating part and AFE (analog front end) transmitting portion.Wherein, forward error correction coding partly is used for carrying out scrambling and the processing of RS coding to sent data, and data and the frame control head after the processing of RS coding carried out independently convolutional encoding, interweaves and repeated encoding, then exports to modulating part.Data behind the repeated encoding that modulating part is used for according to the selected modulation pattern forward error correction coding partly being inputted shine upon, insert that pilot tone, IFFT, insertion Cyclic Prefix, insertion are leading, windowing and overlapping processing, form the base band physical frame, and according to selection is set whether carries out up-conversion of transmission mode, then export to the AFE (analog front end) transmitting portion.The AFE (analog front end) transmitting portion is used for selecting to adopt power line AFE (analog front end) or rf analog front-end to send the data of modulating part input according to arranging of transmission means.
In Fig. 1, forward error correction coding partly comprises scrambling, RS coding, convolutional encoding, interweaves and repeated encoding.Modulating part comprises mapping, inserts pilot tone, IFFT, insertion Cyclic Prefix, insert leading, windowing, overlapping, framing and up-conversion.The AFE (analog front end) transmitting portion comprises power line AFE (analog front end) and rf analog front-end.
Wherein the power line AFE (analog front end) comprises digital to analog converter, low pass filter and transmission driver, and rf analog front-end comprises digital to analog converter, low pass filter, transmission driver and frequency mixer; Described power line AFE (analog front end) and described rf analog front-end multiplexing number weighted-voltage D/A converter, low pass filter and transmission driver, and the parameter of low pass filter and transmission driver is all configurable.
Frame structure is comprised of 9.5 leading (Preamble) symbols, 4 frame control head (Frame Control Header, FCH) symbols and some data symbols as shown in Figure 2.
Based on the data transmission system that the wire and wireless that is applicable to AMI shown in Figure 1 merges, the data transmission method that the present invention also provides the wire and wireless of a kind of AMI of being applicable to merge, the method may further comprise the steps:
Step 1: the forward error correction coding part is carried out scrambling and the processing of RS coding to sent data, and data and the frame control head after the processing of RS coding carried out independently convolutional encoding, interweaves and repeated encoding, then exports to modulating part;
Step 2: the data behind the repeated encoding that modulating part is partly inputted forward error correction coding according to the selected modulation pattern shine upon, insert pilot tone, IFFT, insertion Cyclic Prefix, it is leading to insert, windowing and overlapping processing, form the base band physical frame, and according to selection is set whether carries out up-conversion of transmission mode, then export to the AFE (analog front end) transmitting portion;
Step 3: the AFE (analog front end) transmitting portion selects to adopt power line AFE (analog front end) or rf analog front-end to send the data of modulating part input according to arranging of transmission means.
Based on the system and method shown in above-mentioned Fig. 1 and Fig. 2, Fig. 3 to Fig. 7 shows the data transmission method according to the wire and wireless fusion that is applicable to AMI of the embodiment of the invention, and its concrete treatment step is as follows:
Step 1: generate leading.Leadingly be comprised of 8 P symbols and 1.5 M symbols, each P symbol and M symbol form by 128 sampling points, and the P symbol is used for self adaptation adjustment, sign synchronization, Frequency Synchronization, channel estimating and the initial reference phase estimation of automatic gain control (AGC); The M symbol is obtained by P symbol phase shift π, and it can be used for finishing frame synchronization.The P symbol is by 96 uniformly-spaced subcarrier generations of out of phase (Φ c, as shown in table 1).
Table 1 preamble phase vectors table
| c | Φc | c | Φc | c | Φc | c | Φc |
| -48 | 2 | -24 | 2 | 1 | 10 | 25 | 6 |
| -47 | 2 | -23 | 14 | 2 | 2 | 26 | 10 |
| -46 | 1 | -22 | 10 | 3 | 9 | 27 | 13 |
| -45 | 1 | -21 | 5 | 4 | 1 | 28 | 1 |
| -44 | 0 | -20 | 1 | 5 | 8 | 29 | 4 |
| -43 | 15 | -19 | 12 | 6 | 15 | 30 | 7 |
| -42 | 15 | -18 | 7 | 7 | 6 | 31 | 10 |
| -41 | 14 | -17 | 2 | 8 | 13 | 32 | 13 |
| -40 | 13 | -16 | 13 | 9 | 3 | 33 | 15 |
| -39 | 11 | -15 | 7 | 10 | 10 | 34 | 1 |
| -38 | 10 | -14 | 2 | 11 | 0 | 35 | 4 |
| -37 | 8 | -13 | 12 | 12 | 6 | 36 | 6 |
| -36 | 6 | -12 | 6 | 13 | 12 | 37 | 8 |
| -35 | 4 | -11 | 0 | 14 | 2 | 38 | 10 |
| -34 | 1 | -10 | 10 | 15 | 7 | 39 | 11 |
| -33 | 15 | -9 | 3 | 16 | 13 | 40 | 13 |
| -32 | 13 | -8 | 13 | 17 | 2 | 41 | 14 |
| -31 | 10 | -7 | 6 | 18 | 7 | 42 | 15 |
| -30 | 7 | -6 | 15 | 19 | 12 | 43 | 15 |
| -29 | 4 | -5 | 8 | 20 | 1 | 44 | 0 |
| -28 | 1 | -4 | 1 | 21 | 5 | 45 | 1 |
| -27 | 13 | -3 | 9 | 22 | 10 | 46 | 1 |
| -26 | 10 | -2 | 2 | 23 | 14 | 47 | 2 |
| -25 | 6 | -1 | 10 | 24 | 2 | 48 | 2 |
Step 2: forward error correction.
1) scrambler carries out randomization with the data that send by byte.The generation of scrambler is based at random PN sequence, and the PN sequence XOR of data flow and a repetition is finished scrambling.Wherein the generator polynomial of PN sequence is:
When every frame arrived, scrambler was initialized to complete 1.
2) through the data GF (2 after the scrambler
8) in brachymemma RS (N, K) encode, wherein N takes from 8 to 255 integer, K=N-8, the length of check digit is always 8 bytes, error correcting capability T is 4; Generator polynomial:
Primitive polynomial:
p(x)＝x
8+x
4+x
3+x
2+1(435octal)
Become the higher bit of first symbol of RS encoder from the first bit of scrambler.The output of RS encoder is followed successively by first information bit to last information bit, adds check digit (filling symbol is dropped), and each symbol is that higher bit is exported at first.
3) data behind frame control head and the RS coding are carried out convolutional encoding independently, the code check of convolution code is 1/2, constraint length k=7, and generator polynomial is respectively: G
1=171
Oct, G
2=133
Oct, after last bit of coding enters convolution coder, insert 60 as the ending bit, make convolution coder get back to nought state.
4) frame control head after the convolutional encoding and data are carried out respectively interleaving treatment, interleaver adopts the mode of advancing and listing, as shown in Figure 3, specifically finish in two steps: the first step is by the row incoming bit stream, from the first row to last column, if last remaining data deficiencies delegation then fills up with 0.Second step is by row band skew output bit flow, is listed as to last from first row, and first row is not offset, and increases line by line afterwards side-play amount.
5) data after will interweaving are carried out repeated encoding, and frame control head adopts 6 repeated encodings, and data division adopts 4 repeated encodings under the ROBUST pattern, and data are not carried out repeated encoding under other pattern.Repeated encoding described herein is with the whole repeatedly output of the data after interweaving.
Step 3: modulation.
1) according to the selected modulation pattern, carries out data-mapping and insert pilot tone.Under ROBUST pattern and the DBPSK pattern, data are carried out the DBPSK modulation, under the DQPSK pattern data are carried out DQPSK and modulate.
The OFDM symbol produces by 128 IFFT, 128 subcarriers are divided into three parts (as shown in Figure 4), be respectively data subcarrier, pilot sub-carrier and virtual subnet carrier wave, 8 of pilot tones (subcarrier sequence number 6,8,30,42,86,98,110,122) wherein, 88 of data subcarriers, 32 of virtual subnet carrier waves (subcarrier sequence number 0,49～79).Time domain data sample frequency 250kHz, occupied bandwidth 187.5kHz, subcarrier spacing 1.953125kHz.
2) by 128 IFFT conversion, the data frequency domain data after the insertion pilot tone is transformed to time domain, form time-domain symbol, wherein being input as of IFFT: 1～48 and 80～127 subcarriers input valid data, other subcarrier is input as 0.
3) insert Cyclic Prefix before the symbol that each IFFT generates, as shown in Figure 5, circulating prefix-length is 16 sampling points, and data are taken from the end of this symbol.
4) before first symbol that generates, insert by step 1 and produce leading symbol, leading symbol does not insert Cyclic Prefix.
5) each symbol is carried out windowing process, as shown in Figure 6, the rising edge of institute's windowing and trailing edge respectively account for the length of 4 sampling points, all adopt raised cosine roll-off function to produce, the afterbody that adds a rising window, last half symbols for a targeting sequencing head at first symbol adds a decline window.The raised cosine parameter is as shown in table 2.
Table 2 raised cosine parameter list
| Sampling point | Sampled point | The tail sampled |
| 1 | 0 | 0.8536 |
| 2 | 0.1464 | 0.5 |
| 3 | 0.5 | 0.1464 |
| 4 | 0.8536 | 0 |
6) symbol after the windowing is carried out overlapping processing, as shown in Figure 7, overlapping 4 sampling points of former and later two intersymbols are for targeting sequencing only in the end half symbols place and thereafter first intersymbol overlapping 4 each sampling point.
7) through above processing, formed a complex radical band physical frame, then selection being set whether carrying out up-conversion according to transmission means, if transmission means is wire transmission, then adopt Digital Up Convert that complex radical band physical frame is transferred to base band 253.906kHz centre frequency place, otherwise do not carry out up-conversion.
Step 4: AFE (analog front end) sends:
According to the setting of transmission means, select to adopt power line AFE (analog front end) or rf analog front-end to send data.The power line AFE (analog front end) comprises: digital to analog converter, low pass filter and transmission driver; Rf analog front-end comprises: digital to analog converter, low pass filter, transmission driver and frequency mixer.Wherein digital to analog converter, low pass filter and the equal reusable of transmission driver, low pass filter and to send the parameter of driver all configurable.
Physical frame by above step generation, can adaptive power line communication and radio communication, realized the fusion of wire transmission and wireless transmission, reduced system complexity, and so that system can carry out wired and unlimited flexible switching according to environment and the characteristic of channel.
Data transmission system and the method for the wire and wireless fusion of a kind of AMI of being applicable to above, have been described.Although the present invention describes with reference to specific embodiment, clearly, those of ordinary skill in the art in the situation that is not offset invention scope that claims limit and spirit, can also make various modifications and changes to these embodiment.Therefore, specification and accompanying drawing are descriptive, rather than determinate.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. the data transmission system that the wire and wireless that is applicable to AMI merges is characterized in that, this system realizes based on the OFDM technology, comprising:
The forward error correction coding part is used for carrying out scrambling and the processing of RS coding to sent data, and data and the frame control head after the processing of RS coding is carried out independently convolutional encoding, interweaves and repeated encoding, then exports to modulating part;
Modulating part, data behind the repeated encoding that is used for according to the selected modulation pattern forward error correction coding partly being inputted shine upon, insert that pilot tone, IFFT, insertion Cyclic Prefix, insertion are leading, windowing and overlapping processing, form the base band physical frame, and according to selection is set whether carries out up-conversion of transmission mode, then export to the AFE (analog front end) transmitting portion; And
The AFE (analog front end) transmitting portion is used for selecting to adopt power line AFE (analog front end) or rf analog front-end to send the data of modulating part input according to arranging of transmission means;
Wherein, described AFE (analog front end) transmitting portion comprises power line AFE (analog front end) and rf analog front-end, wherein the power line AFE (analog front end) comprises digital to analog converter, low pass filter and transmission driver, and rf analog front-end comprises digital to analog converter, low pass filter, transmission driver and frequency mixer; Described power line AFE (analog front end) and described rf analog front-end multiplexing number weighted-voltage D/A converter, low pass filter and transmission driver, and the parameter of low pass filter and transmission driver is all configurable.
2. the data transmission system that merges of the wire and wireless that is applicable to AMI according to claim 1, it is characterized in that, described forward error correction coding part is carried out scrambling and the processing of RS coding to sent data, and data and frame control head after RS coding processed carry out independently convolutional encoding, interweave and repeated encoding, specifically comprises:
Forward error correction coding part is carried out scrambling to sent data take byte as unit, and wherein the generation of scrambler is based at random PN sequence, and the generator polynomial of PN sequence is:
Process is carried out scrambling the data GF (2 afterwards
8) in brachymemma RS (N, K) encode, wherein N takes from 8 to 255 integer, K=N-8;
Data and frame control head after the processing of RS coding are carried out convolutional encoding independently, and the code check of convolution code is 1/2, constraint length k=7, and generator polynomial is respectively: G
1=171
Oct, G
2=133
Oct, after last bit of coding enters convolution coder, insert 60 as the ending bit, make convolution coder get back to nought state;
Data after the convolutional encoding and frame control head are carried out respectively interleaving treatment; And
Data after interweaving are carried out repeated encoding, and frame control head adopts 6 repeated encodings.
3. the data transmission system that is applicable to the wire and wireless fusion of AMI according to claim 2 is characterized in that,
Described when the data after the convolutional encoding and frame control head are carried out interleaving treatment respectively, interleaver adopts the mode of advancing and listing, and adopts the circulation output with side-play amount during by row output, and side-play amount increases progressively by row;
Described when the data after interweaving are carried out repeated encoding, data division adopts 4 repeated encodings under the ROBUST pattern, and data are not carried out repeated encoding under the non-ROBUST pattern, and this repeated encoding is with the whole repeatedly output of the data after interweaving.
4. the data transmission system that merges of the wire and wireless that is applicable to AMI according to claim 1, it is characterized in that, data behind the repeated encoding that described modulating part is partly inputted forward error correction coding according to the selected modulation pattern shine upon, insert pilot tone, IFFT, insertion Cyclic Prefix, it is leading to insert, windowing and overlapping processing, form the base band physical frame, and according to selection is set whether carries out up-conversion of transmission mode, specifically comprise:
Modulating part is carried out data-mapping and is inserted pilot tone according to the selected modulation pattern;
By 128 IFFT conversion, the data frequency domain data after the insertion pilot tone is transformed to time domain, form time-domain symbol;
Before the symbol that each IFFT generates, insert Cyclic Prefix;
Before first symbol that generates, insert leading symbol;
Each symbol is carried out windowing process;
Symbol after the windowing is carried out overlapping processing; And
Through above processing, formed a complex radical band physical frame, then according to selection is set whether carries out up-conversion of transmission means, if transmission means is wire transmission, then adopts Digital Up Convert that complex radical band physical frame is transferred to base band, otherwise do not carry out up-conversion.
5. the data transmission system that is applicable to the wire and wireless fusion of AMI according to claim 4 is characterized in that,
When described modulating part is carried out data-mapping and inserted pilot tone according to the selected modulation pattern, under ROBUST pattern and DBPSK pattern, data are carried out the DBPSK modulation, under the DQPSK pattern, data are carried out DQPSK and modulate;
In the described IFFT conversion, IFFT is input as: 1～48 and 80～127 subcarriers input valid data, and other subcarrier is input as 0;
Described when inserting Cyclic Prefix before the symbol that each IFFT generates, circulating prefix-length is 16 sampling points, and data are taken from the end of this symbol;
Before described first symbol generating, when inserting leading symbol, leading symbol does not insert Cyclic Prefix, and targeting sequencing is formed by connecting by 9.5 symbol lengths leading symbols;
It is described when each symbol is carried out windowing process, the rising edge of institute's windowing and trailing edge respectively account for the length of 4 sampling points, all adopt raised cosine roll-off function to produce, the afterbody that adds a rising window, last half symbols for a targeting sequencing head at first symbol adds a decline window;
Described when the symbol after the windowing is carried out overlapping processing, overlapping 4 sampling points of former and later two intersymbols are for targeting sequencing only in the end half symbols place and thereafter overlapping 4 sampling points of first intersymbol.
6. a data transmission method that is applicable to the wire and wireless fusion of AMI is applied to system claimed in claim 1, it is characterized in that, comprising:
The forward error correction coding part is carried out scrambling and the processing of RS coding to sent data, and data and the frame control head after the processing of RS coding carried out independently convolutional encoding, interweaves and repeated encoding, then exports to modulating part;
Data behind the repeated encoding that modulating part is partly inputted forward error correction coding according to the selected modulation pattern shine upon, insert pilot tone, IFFT, insertion Cyclic Prefix, it is leading to insert, windowing and overlapping processing, form the base band physical frame, and according to selection is set whether carries out up-conversion of transmission mode, then export to the AFE (analog front end) transmitting portion; And
The AFE (analog front end) transmitting portion selects to adopt power line AFE (analog front end) or rf analog front-end to send the data of modulating part input according to arranging of transmission means;
Wherein, described AFE (analog front end) transmitting portion comprises power line AFE (analog front end) and rf analog front-end, wherein the power line AFE (analog front end) comprises digital to analog converter, low pass filter and transmission driver, and rf analog front-end comprises digital to analog converter, low pass filter, transmission driver and frequency mixer; Described power line AFE (analog front end) and described rf analog front-end multiplexing number weighted-voltage D/A converter, low pass filter and transmission driver, and the parameter of low pass filter and transmission driver is all configurable.
7. the data transmission method that merges of the wire and wireless that is applicable to AMI according to claim 6, it is characterized in that, the method also comprised: system modulation pattern and transmission mode are set the forward error correction coding part is carried out the processing of scrambling and RS coding to sent data before.
8. the data transmission method that merges of the wire and wireless that is applicable to AMI according to claim 7 is characterized in that described system modulation pattern and the transmission mode of arranging comprises:
The system modulation pattern is set: the system modulation pattern is divided into ROBUST pattern, DBPSK pattern, DQPSK pattern, and wherein under the ROBUST pattern, the data DBPSK modulates, and when repeated encoding, data are carried out repeated encoding 4 times; Under DBPSK pattern and DQPSK pattern, data adopt respectively DBPSK and DQPSK modulation, and when repeated encoding, data are not carried out repeated encoding;
System transmission mode is set: system transmission mode is divided into wire transmission pattern and wireless communication mode, adopt the arrowband power line channel to carry out transfer of data under the wherein wire transmission pattern, adopt the 470-510MHz wireless channel to carry out transfer of data under the wireless communication mode.
9. the data transmission method that merges of the wire and wireless that is applicable to AMI according to claim 6, it is characterized in that, described forward error correction coding part is carried out scrambling and the processing of RS coding to sent data, and data and frame control head after RS coding processed carry out independently convolutional encoding, interweave and repeated encoding, comprising:
Forward error correction coding part is carried out scrambling to sent data take byte as unit, and wherein the generation of scrambler is based at random PN sequence, and the generator polynomial of PN sequence is:
Process is carried out scrambling the data GF (2 afterwards
8) in brachymemma RS (N, K) encode, wherein N takes from 8 to 255 integer, K=N-8;
Data and frame control head after the processing of RS coding are carried out convolutional encoding independently, and the code check of convolution code is 1/2, constraint length k=7, and generator polynomial is respectively: G
1=171
Oct, G
2=133
Oct, after last bit of coding enters convolution coder, insert 60 as the ending bit, make convolution coder get back to nought state;
Data after the convolutional encoding and frame control head are carried out respectively interleaving treatment; And
Data after interweaving are carried out repeated encoding, and frame control head adopts 6 repeated encodings.
10. the data transmission method that is applicable to the wire and wireless fusion of AMI according to claim 9 is characterized in that,
Described when the data after the convolutional encoding and frame control head are carried out interleaving treatment respectively, interleaver adopts the mode of advancing and listing, and adopts the circulation output with side-play amount during by row output, and side-play amount increases progressively by row;
Described when the data after interweaving are carried out repeated encoding, data division adopts 4 repeated encodings under the ROBUST pattern, and data are not carried out repeated encoding under the non-ROBUST pattern, and this repeated encoding is with the whole repeatedly output of the data after interweaving.
11. the data transmission method that the wire and wireless that is applicable to AMI according to claim 6 merges, it is characterized in that, data behind the repeated encoding that described modulating part is partly inputted forward error correction coding according to the selected modulation pattern shine upon, insert pilot tone, IFFT, insertion Cyclic Prefix, it is leading to insert, windowing and overlapping processing, form the base band physical frame, and according to selection is set whether carries out up-conversion of transmission mode, comprising:
Modulating part is carried out data-mapping and is inserted pilot tone according to the selected modulation pattern;
By 128 IFFT conversion, the data frequency domain data after the insertion pilot tone is transformed to time domain, form time-domain symbol;
Before the symbol that each IFFT generates, insert Cyclic Prefix;
Before first symbol that generates, insert leading symbol;
Each symbol is carried out windowing process;
Symbol after the windowing is carried out overlapping processing; And
Through above processing, formed a complex radical band physical frame, then according to selection is set whether carries out up-conversion of transmission means, if transmission means is wire transmission, then adopts Digital Up Convert that complex radical band physical frame is transferred to base band, otherwise do not carry out up-conversion.
12. the data transmission method that the wire and wireless that is applicable to AMI according to claim 11 merges is characterized in that,
When described modulating part is carried out data-mapping and inserted pilot tone according to the selected modulation pattern, under ROBUST pattern and DBPSK pattern, data are carried out the DBPSK modulation, under the DQPSK pattern, data are carried out DQPSK and modulate;
In the described IFFT conversion, IFFT is input as: 1～48 and 80～127 subcarriers input valid data, and other subcarrier is input as 0;
Described when inserting Cyclic Prefix before the symbol that each IFFT generates, circulating prefix-length is 16 sampling points, and data are taken from the end of this symbol;
Before described first symbol generating, when inserting leading symbol, leading symbol does not insert Cyclic Prefix, and targeting sequencing is formed by connecting by 9.5 symbol lengths leading symbols;
It is described when each symbol is carried out windowing process, the rising edge of institute's windowing and trailing edge respectively account for the length of 4 sampling points, all adopt raised cosine roll-off function to produce, the afterbody that adds a rising window, last half symbols for a targeting sequencing head at first symbol adds a decline window;
Described when the symbol after the windowing is carried out overlapping processing, overlapping 4 sampling points of former and later two intersymbols are for targeting sequencing only in the end half symbols place and thereafter overlapping 4 sampling points of first intersymbol.
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| CN103957083B (en) * | 2014-05-16 | 2018-05-15 | 江苏中兴微通信息科技有限公司 | A kind of method and device for improving signaling frame transmission robustness |
| CN106656898B (en) * | 2015-02-12 | 2020-06-09 | 上海数字电视国家工程研究中心有限公司 | Preamble symbol receiving apparatus |
| CN105656515B (en) * | 2016-01-29 | 2019-04-05 | 北京四季豆信息技术有限公司 | Broadband power line carrier communication sending device and receiving device |
| CN106603457B (en) * | 2016-12-09 | 2020-12-25 | 中国电力科学研究院 | OFDM-based broadband power line carrier communication physical layer signal processing method |
| CN107026713B (en) * | 2017-03-17 | 2018-04-10 | 广东蜂助手网络技术股份有限公司 | A kind of method that network speed is improved in the case of network communication bag adhesion |
| CN108696295B (en) * | 2017-04-07 | 2021-12-31 | 华为技术有限公司 | Method and device for transmitting data based on power line system |
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