CN105450259B - Intelligent meter data recording system multi-carrier communication module self-adaptive modulation method - Google Patents
Intelligent meter data recording system multi-carrier communication module self-adaptive modulation method Download PDFInfo
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- CN105450259B CN105450259B CN201510781265.4A CN201510781265A CN105450259B CN 105450259 B CN105450259 B CN 105450259B CN 201510781265 A CN201510781265 A CN 201510781265A CN 105450259 B CN105450259 B CN 105450259B
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- China
- Prior art keywords
- subcarrier
- error rate
- bit
- noise ratio
- communication module
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2646—Arrangements specific to the transmitter only using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
Abstract
The invention discloses a kind of intelligent meter data recording system multi-carrier communication module self-adaptive modulation methods.This method is under the limitation of target error rate and fix power allocation, sub-carrier signal-noise ratio estimated value and multi-subcarrier signal-to-noise ratio (SNR) estimation value are obtained by the estimation of multi-carrier communication module channel gain and frame preamble data first, then the additional bit of OFDM symbol can be increased to according to signal-to-noise ratio (SNR) estimation acquisition, adaptive the distributing to of additional bit finally influences into average error rate minimum subcarrier by the increment bit error rate of subcarrier, so as to obtain the modulator approach close to optimum transmission rate, reduce the complexity of operation and be easily achieved and apply.
Description
Technical field
The present invention relates to one kind to be used for intelligent meter data recording system multicarrier (OFDM, Orthogonal Frequency
Division Multiplexing) communication module self-adaptive modulation method.
Background technology
Existing intelligent meter data recording system multi-carrier communication module, realization standard have G3 standard OFDM power-line carrier communications
With PRIME standard OFDM power-line carrier communications, PRIME standards are similar with G3 standards, so here by taking G3 standards as an example
The shortcomings that illustrating the prior art.G3 standards are on the basis of the requirement of transmission rate or bit error rate is met, each subcarrier
Switch between different mode, but each subcarrier, using identical modulation system and transmission power, with closing, certain interference are tight
The subcarrier of weight come it is anti-interference, with it is worst when channel conditions design modulation and parameters, the system such as coding include overcoming most
Many expenses of poor condition, it is to exchange reliability for sacrifice the availability of frequency spectrum and rate of information transmission as cost to do so, mainly
Shortcoming is as follows：
1. its robustness of the bigger subcarrier of noise jamming will die down, so error of transmission is more serious, efficiency of transmission
It is low.
2. for the higher subcarrier of noise, using the modulation system of low transmission efficiency by waste bandwidth.
3. all subcarriers use identical modulation and demodulation mode, the efficiency of transmission of whole system and anti-interference will be reduced
Ability.
Invention content
The purpose of the present invention is in given target error rate (BER, Bit Error Rate) and fix power allocation premise
A kind of non-iterative self-adaptive modulation method of optimum transmission rate is provided down for intelligent meter data recording system multi-carrier communication module.
This intelligent meter data recording system multi-carrier communication module self-adaptive modulation method provided by the invention, this method are included such as
Lower step：
Step 1, initialized target bit error rate PT, PTIt is determined by the requirement of multi-carrier communication module transfer performance, all sub- loads
Wave fix power allocation；
Step 2, sub-carrier signal-noise ratio (SNR, Signal Noise Ratio) γ is calculatedn；
Step 3, by sub-carrier signal-noise ratio γn, in Pn＜ PTLimitation under, for the ratio that can pre-allocate of each subcarrier calculating
Special digit bn, wherein bnAnd PnIt is respectively the bit and BER of each subcarrier, and calculates average error rate
Step 4, by sub-carrier signal-noise ratio γnAnd average error rateCalculate current multichannel signal-to-noise ratio γmcAnd subcarrier
Average number of bits
Step 5, in PTLimitation under, by γmcThe maximum for calculating each subcarrier is averaged number of bitsWith can increase
Add to the additional bit position I of OFDM symbol；
Step 6, when subcarrierWhen calculate incremental bit error rate Δ P on this subcarriern, that is, calculate this son
When carrier wave distributes maximal bit digit, the increased bit error rate of institute, and by Δ PnIt is arranged according to the ascending order of value；
Step 7, increase I additional bit position to most low delta pnSubcarrier.
The beneficial effects of the invention are as follows：The present invention is under the limitation of target error rate and fix power allocation, according to each
The signal-to-noise ratio (SNR) estimation value of subcarrier and multi-subcarrier signal-to-noise ratio (SNR) estimation value determine that the additional bit of subcarrier can be distributed to, and will
It, which is distributed to, influences average error rate minimum subcarrier, so as to the number of bits of the adaptive each subcarrier of adjustment, obtains
To the modulator approach close to optimum transmission rate, reduce the complexity of operation and be easily achieved and apply.
Description of the drawings
Fig. 1 is the system construction drawing of intelligent meter data recording system multi-carrier communication module of the present invention.
Fig. 2 is intelligent meter data recording system multi-carrier communication module grouping frame structure of the present invention.
Fig. 3 is the method flow diagram of Adaptive Modulation of the present invention.
Specific embodiment
Intelligent meter data recording system power line carrier module is to be directly facing the physical medium power line for actually undertaking data transmission, is
The physical connection of a transmission original bit stream is provided for upper layer application data on power line, so power line carrier module is straight
Various interference and attenuation of the junction to power line.
The invention will be further described below in conjunction with the accompanying drawings.
As shown in Figure 1, intelligent meter data recording system multi-carrier communication module transmitting terminal include forward error control encoder and
OFDM modulation modules.Data to be transmitted first carries out crosstalk, RS codings, convolutional encoding, interleaving treatment, then carries out Adaptive Modulation simultaneously
It sends to and does IFFT transformation.The structure of corresponding receiving terminal is exactly the opposite with transmitting terminal, and the data received first carry out sign synchronization,
Then FFT transform is carried out, while channel is estimated.Data after FFT transform are demodulated, and multi-system data bit is become
2 binary data code streams, are deinterleaved later, Viterbi decodings, and solution crosstalk processing finally obtains transmission end data.
The frequency decay of low-voltage power line determines that different subcarriers has different noise jammings, and in band
Under the premise of wide and transimission power is certain, in order to improve the transmission capacity of ofdm system, using adaptive in OFDM carrier modules
Modulation system is answered, is estimated to dynamically distribute bit according to carrier channel SNR.
As shown in Fig. 2, intelligent meter data recording system multi-carrier communication module grouping frame structure of the present invention includes leading, frame control head
And data segment.Targeting sequencing is made of the symbol of the paraphase therewith of 8 identical symbols and 1.5, identical using this
8 symbols and receiving terminal channel gain estimation obtain the SNR of subcarrier, calculate sub-carrier signal-noise ratio according to the following formula：
N=1, wherein 2 ..., N, ρn, HnWithIt is the signal power of n-th of subcarrier respectively,
Channel gain is estimated and noise power, N are the sub-carrier numbers being used.Because targeting sequencing is it is known that sub-carrier signal work(
Rate ρnIt is known that channel gain HnIt is obtained by channel estimation, noise powerBy receiving terminal targeting sequencing power and ρn×|Hn|2Phase
Subtract to obtain.
Frame control head includes the important information of demodulation data frame.It is data symbol after frame control head, referred to as loads.
Illustrate this intelligent meter data recording system multi-carrier communication module Adaptive Modulation side provided by the invention with reference to Fig. 3
Method, this method specific implementation step：
Step 1, initialized target bit error rate PT, all subcarrier fix power allocations；
Step 2, by the lead data of previous frame and channel gain estimated value HnCalculate sub-carrier signal-noise ratio (SNR, Signal
Noise Ratio)：
N=1, wherein 2 ..., N, ρn, HnWithIt is the signal power of n-th of subcarrier respectively,
Channel gain estimated value and noise power, N are the sub-carrier numbers being used；
Step 3, by sub-carrier signal-noise ratio γn, in Pn＜ PTLimitation under, for the ratio that can pre-allocate of each subcarrier calculating
Special digit bnWith subcarrier average error rate
Wherein, bnAnd PnIt is the bit and BER of each subcarrier respectively；
Step 4, by sub-carrier signal-noise ratio γnAnd average error rateCalculate current multichannel signal-to-noise ratio γmcAnd subcarrier
Average number of bits
Wherein,WithIt is the average number of bits of subcarrier and average BER, γ respectivelymcIt is multichannel signal-to-noise ratio；
Step 5, in PTLimitation under, by γmcThe maximum for calculating each subcarrier is averaged number of bits
Step 6, the additional bit position of OFDM symbol can be increased to by calculating：
Step 7, when subcarrierWhen calculate increment bit error rate Δ P on this subcarriern, that is, calculate this son
When carrier wave distributes maximal bit digit, the increased bit error rate of institute：
N=1,2 ..., N, whereinWhen being that n-th of subcarrier is modulated using maximal bit
The bit error rate, and by Δ PnIt is arranged according to the ascending order of value.
Step 8, increase I additional bit position to most low delta pnSubcarrier.Method is to each most low delta pnSubcarrier point
With maximal bit digit, i.e., using the permitted most high order modulation of system, until all I additional bits are assigned or minimum
ΔPnSubcarrier distributes maximal bit digit.
Claims (3)
1. a kind of intelligent meter data recording system multi-carrier communication module self-adaptive modulation method, this method can be with by matching the calculating that applies a formula
The additional bit of current sign subcarrier is increased to, and finds out the subcarrier for influencing minimum in all subcarriers on average error rate
It is allocated, it is characterised in that：The intelligent meter data recording system multi-carrier communication module self-adaptive modulation method includes following step
Suddenly：
Step 1, initialized target bit error rate PT, PTDetermine that all subcarriers are consolidated by the requirement of multi-carrier communication module transfer performance
Determine power distribution；
Step 2, sub-carrier signal-noise ratio (SNR, Signal Noise Ratio) γ is calculatedn；
Step 3, by sub-carrier signal-noise ratio γn, in Pn<PTLimitation under, calculate the maximum bit that can be pre-allocated for each subcarrier
Digit bn, wherein bnAnd PnIt is the bit of each subcarrier and the bit error rate (BER, Bit Error Rate) respectively, and calculates average
The bit error rate
Step 4, by sub-carrier signal-noise ratio γnAnd average error rateCalculate current multichannel signal-to-noise ratio γmcWith putting down for subcarrier
Equal bit number
Step 5, in PTLimitation under, by γmcThe maximum for calculating each subcarrier is averaged number of bitsWith can increase to
The additional bit position I of OFDM symbol；
Step 6, when subcarrierWhen calculate incremental bit error rate Δ P on this subcarriern, that is, calculate this subcarrier point
During with maximal bit digit, the increased bit error rate of institute, and by Δ PnIt is arranged according to the ascending order of value；
Step 7, increase I additional bit position to most low delta pnSubcarrier.
2. intelligent meter data recording system multi-carrier communication module self-adaptive modulation method according to claim 1, which is characterized in that
The calculating sub-carrier signal-noise ratio is to calculate sub-carrier signal-noise ratio with the lead data and channel estimation value of receiving terminal.
3. intelligent meter data recording system multi-carrier communication module self-adaptive modulation method according to claim 1, which is characterized in that
It is described to increase I additional bit position to most low delta pnSubcarrier is to each most low delta pnSubcarrier distributes maximal bit digit,
I.e. using the permitted most high order modulation of system, until all I additional bits are assigned or most low delta pnSubcarrier is divided equally
With complete maximal bit position.
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| CN106506047B (en) * | 2016-12-20 | 2019-05-14 | 创达特（苏州）科技有限责任公司 | A kind of carrier communication method of low-voltage power line, apparatus and system |
| CN112763003A (en) * | 2020-10-14 | 2021-05-07 | 陕西阳光时代电气有限公司 | Data acquisition system and method based on intelligent instrument communication unit in power grid |
| CN112910699A (en) * | 2021-01-28 | 2021-06-04 | 山东山大世纪科技有限公司 | Intelligent fault detection method and device for power internet of things |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1921469A (en) * | 2006-09-14 | 2007-02-28 | 北京邮电大学 | Non-equivalent code error rate self-adaptive transmitting method for OFDM system |
| CN101483502A (en) * | 2009-02-24 | 2009-07-15 | 北京邮电大学 | Adaptive transmission method suitable for hybrid modulation mode |
| CN104283830A (en) * | 2013-07-01 | 2015-01-14 | 北京信威通信技术股份有限公司 | Self-adaptive modulating method |
| WO2015131812A1 (en) * | 2014-03-07 | 2015-09-11 | 富士通株式会社 | Signal transmission device and multicarrier communication system |
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2015
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1921469A (en) * | 2006-09-14 | 2007-02-28 | 北京邮电大学 | Non-equivalent code error rate self-adaptive transmitting method for OFDM system |
| CN101483502A (en) * | 2009-02-24 | 2009-07-15 | 北京邮电大学 | Adaptive transmission method suitable for hybrid modulation mode |
| CN104283830A (en) * | 2013-07-01 | 2015-01-14 | 北京信威通信技术股份有限公司 | Self-adaptive modulating method |
| WO2015131812A1 (en) * | 2014-03-07 | 2015-09-11 | 富士通株式会社 | Signal transmission device and multicarrier communication system |
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