CN105357600B - A kind of transmission power-economizing method of OFDM-PON - Google Patents
A kind of transmission power-economizing method of OFDM-PON Download PDFInfo
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- CN105357600B CN105357600B CN201510682102.0A CN201510682102A CN105357600B CN 105357600 B CN105357600 B CN 105357600B CN 201510682102 A CN201510682102 A CN 201510682102A CN 105357600 B CN105357600 B CN 105357600B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012549 training Methods 0.000 claims description 14
- 239000013256 coordination polymer Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims 1
- 238000004891 communication Methods 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 230000003287 optical effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000009432 framing Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 238000013139 quantization Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
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- 239000013307 optical fiber Substances 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/27—Arrangements for networking
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Abstract
The present invention relates to a kind of power-economizing method of the communications field, more particularly to a kind of transmission power-economizing method of orthogonal frequency passive optical network OFDM-PON systems.This method is the transmission power-economizing method based on OFDM-PON transmitting terminals, when based on the OFDM-PON network architectures without downlink traffic transmission, OFDM-PON transmitting terminals send idle frame, idle content frame is partly or entirely provided by ram in slice, and closes or bypass OFDM-PON transmitting terminals digital demodulation signal (DSP) module to avoid dsp system carries out coding and operation to data and generates energy consumption.With realize OFDM-PON transmitting terminals based on the energy saving of transmission services flow.
Description
Technical field
The present invention relates to the communications field, more particularly to a kind of orthogonal frequency division multiplexing passive optical network（OFDM-PON）Transmission
Power-economizing method.
Background technology
OFDM-PON channel capacities are very big, spectrum efficiency is high, cost is low, resource allocation is shared flexible, not only meet
The characteristic requirements of next-generation Optical Access Network also meet the network demand that network operator provides large capacity, services more.
With the continuous development of network size, communication and information technology field occupies the 8% of global power resource consumption,
Wherein the Internet transmission equipment energy consumption accounts for the field nearly 10%.Current Internet business is mainly carried by fiber optic network,
And wherein backbone network and Metropolitan Area Network (MAN) only accounts for 19% energy consumption, the access net being directly connected with the terminal user of substantial amounts occupies
The energy consumption of entire fiber optic network 81%.Therefore reducing its energy consumption becomes the important link for realizing green, energy saving optical-fiber network.
At present in OFDM-PON systems, since the communication of OFDM-PON is dependent on modulation and demodulation signal processing algorithm
Complexity, therefore the transmission power-economizing method of OFDM-PON is mainly reflected in the complexity aspect for how reducing signal processing algorithm.
Such as London university had studied 128 points of fixed point IFFT/FFT in 2011（Fourier transformation/inverse Fourier transform）It is defeated
Go out influence of the word length to light OFDM performances, it is indicated that under the premise of not influencing communication reliability, by reducing OFDM systems FFT/
The afterbody of IFFT exports word length to reduce system power dissipation.Shanghai University proposes by optimizing OFDM-PON demodulating algorithms
Middle output word length is with twiddle factor word length to reduce system power dissipation.Shanghai Communications University proposes based on time interleaved modulators
TI-OFDM reduces ONU（Optical network unit）System power dissipation.However existing literature is when seldom referring to that downlink communication business is less
OFDM-PON transmitting terminal power-economizing methods.
Invention content
It is an object of the invention in view of the deficienciess of the prior art, providing a kind of transmission energy-saving square of OFDM-PON
Method is adjusted the working time of OFDM modulation modules by dynamic in OFDM transmitting terminals, avoided according to the bandwidth of downlink transfer business
Transmitting terminal OFDM modulation operations in no downlink business consume additional power consumption, realize energy saving；In OFDM receiving terminals by patrolling
It collects link identifier and carries out the differentiation of business, if detecting that the data received are IDLE（It is idle）Data, then without
OFDM demodulation.
The technical proposal of the invention is realized in this way：
A kind of transmission power-economizing method of OFDM-PON is the transmission power-economizing method based on OFDM-PON transmitting terminals, feature
It is：Transmitting terminal sends service queue to downlink first and is detected, if detecting no downlink business, is cut by link
It changes enable signal and sends idle frame to DAC；If detecting that downlink has business, starts OFDM modulation modules and send number to DAC
According to frame.
The transmission power-economizing method of above-mentioned OFDM-PON, the frame structure of the idle frame include successively：Training sequence CP, training
Sequence, IDLE identifiers, OFDM symbol length and IDLE data.
The transmission power-economizing method of OFDM-PON, the idle frame are all provided by stored data in ram in slice.
The transmission power-economizing method of OFDM-PON, training sequence CP in the idle frame, training sequence, IDLE identifiers and
OFDM symbol length is provided by ram in slice stored data, and the output of IDLE data uses fixed numerical value.
The transmission power-economizing method of OFDM-PON, the IDLE data in the idle frame use full 0 data.
After receiving terminal completion OFDM symbol synchronizes, link identification is obtained in time domain for the transmission power-economizing method of OFDM-PON
Symbol, if link identifier is idle frame, subsequent data are without OFDM demodulation；If link identifier is data frame,
OFDM data demodulation is further completed, and the data of demodulation storage to reception data queue.
The present invention compared with prior art, has following obvious prominent substantive distinguishing features and marked improvement：
The present invention proposes the transmission power-economizing method based on OFDM-PON, in transmitting terminal without when sending service, passes through structure
One does not need the idle frame that OFDM modulation calculates, and reduces the additional energy that the processing of complexity OFDM modulated digital signals generates.It should
Method is relatively low in access net downlink bandwidth（Such as at night）When, 70% transmission energy consumption can be saved.It is logical in data receiver simultaneously
It crosses in time-domain detection link identifier, the control of OFDM demodulation operation can be carried out according to the OFDM frame types identified, to
Further decrease the power consumption of OFDM receiving terminals.
Description of the drawings
Fig. 1 is OFDM frame structures schematic diagram used by one embodiment of the invention；
Fig. 2 is the time domain schematic diagram of OFDM-PON IDLE identifiers and OFDM symbol length in one embodiment of the invention；
Fig. 3 is the link switching transmission schematic diagram of OFDM-PON systems transmitting terminal in one embodiment of the invention；
Fig. 4 is the processing procedure schematic diagram of OFDM-PON system receiving terminals in one embodiment of the invention.
Specific implementation mode
The preferred embodiment of the present invention combination attached drawing, details are as follows：
Fig. 1 is OFDM frame structures used by one embodiment of the invention, includes successively：Training sequence CP, training sequence, chain
Line symbol, OFDM symbol length（Support elongated OFDM data）With OFDM transmission data, OFDM idle frames and OFDM data
Numerical value can be that 0x0000 is identified as idle frame, the present embodiment link mark difference lies in link identifier difference by frame
Symbol and OFDM symbol length are all made of 16, using the transmission mode of time domain NRZ.Fig. 2 is OFDM- in a real-time example of the invention
The time domain schematic diagram of PON IDLE identifiers and OFDM symbol length, 2 sampling lengths of each bit occupancy so that OFDM receiving terminals
After completing sign synchronization, can corresponding information demodulation be carried out without participating in OFDM according to signal energy in the time domain
Demodulate operation.Wherein training sequence is the BPSK IFFT output of pseudo noise code, receiving terminal using long training sequence be locally stored
Sequence carry out associated budget realize OFDM accurate sign synchronization, and using training sequence realize channel transfer functions calculate with
Channel equalization.
Fig. 3 is the link switching transmission schematic diagram of OFDM-PON systems transmitting terminal in one embodiment of the invention, OFDM-PON
The transmitting terminal of system carries out business detection first, has detected whether that data need to send, if there is data need to send, then OFDM
Transmitting terminal is to DAC transmission data frames；It is same to cross link switching enable signal if detecting that no data need to send, to
DAC sends idle frame.OFDM sending modules need to carry out channel self-adapting QAM mappings, work(to data frame in transmission data frame
Calculating processes, these calculating processes such as rate control, IFFT operations, framing, DAC quantizations are completed by OFDM modulation modules, need to disappear
Consume a large amount of energy consumption.
In OFDM-PON communication systems, though there is no downlink communication data system yet must according to Fig. 1 frame structure to
Lower transmission OFDM data so that OFDM-PON transmitting-receiving two-ends are capable of the stability of maintenance link.Therefore it is proposed that system is in
Idle frame is sent when idle state, if idle frame is also sent by OFDM sending modules, also to repeat adaptive QAM mapping,
The processes such as the operations such as power control, IFFT operations, framing, DAC quantizations need to consume additional digital modulation module calculating energy
Consumption.And idle data, without practical significance, is used only to the mark of maintenance link idle state for transmitting terminal and receiving terminal
Know.Therefore, it is proposed that idle frame is stored in RAM, so as to avoid above-mentioned operation, realizes energy saving.Idle frame can be complete
Portion is stored in RAM；Training sequence, IDLE identifiers, OFDM symbol length can also be stored in RAM, IDLE data are defeated
Go out to use fixed numerical value.In order to reduce the depth of storage RAM, IDLE data can also be used full 0, pass through the simple control of logic
To realize.
Fig. 4 is the processing procedure schematic diagram of OFDM-PON system receiving terminals in one embodiment of the invention, and receiving terminal receives
After OFDM frames, OFDM symbol being completed first and is synchronized, link identifier is then obtained by the differentiation of NRZ signals in time domain, if
Link identifier is idle frame, then subsequent data are set as full 0 without OFDM demodulation, or solution adjusting data, the solution for being
It is 0 to adjust the Data flipping rate of digital signal processing algorithm, reduces power consumption, but the data after demodulation directly abandon, and are not stored in and connect
Receive data queue；If link identifier is data frame, OFDM data demodulation is further completed, and the data storage of demodulation is arrived
Receive data queue.
The above is the preferred embodiment of the present invention, is not intended to limit the scope of the present invention, all in essence of the invention
The all any modification, equivalent and improvement etc. done within refreshing and principle are contained within protection scope of the present invention.
Claims (5)
1. the transmission power-economizing method of OFDM-PON a kind of, is the transmission power-economizing method based on OFDM-PON transmitting terminals, feature exists
In：Transmitting terminal sends service queue to downlink and is detected, if downlink, which is not detected, sends business, is made by link switching
Energy signal sends idle frame to DAC, and closes OFDM modulation modules；If having detected that downlink sends business, start OFDM
Modulation module is to DAC transmission data frames；After receiving terminal completion OFDM symbol synchronizes, link identifier is obtained in time domain, if
Link identifier is idle frame, then subsequent data are without OFDM demodulation；It is further complete if link identifier is data frame
It is demodulated at OFDM data, and the data of demodulation storage to reception data queue.
2. the transmission power-economizing method of OFDM-PON according to claim 1, it is characterised in that the frame structure of the idle frame
Include successively：Training sequence CP, training sequence, IDLE identifiers, OFDM symbol length and IDLE data.
3. OFDM-PON according to claim 2 transmits power-economizing method, it is characterised in that the idle frame is all by piece
Stored data provides in RAM.
4. OFDM-PON according to claim 2 transmits power-economizing method, it is characterised in that training sequence in the idle frame
CP, training sequence, IDLE identifiers and OFDM symbol length are provided by ram in slice stored data, and the output of IDLE data is using solid
Fixed numerical value.
5. the transmission power-economizing method of OFDM-PON according to claim 3 or 4, it is characterised in that in the idle frame
IDLE data use full 0 data.
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| CN201510682102.0A CN105357600B (en) | 2015-10-21 | 2015-10-21 | A kind of transmission power-economizing method of OFDM-PON |
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| CN105357600B true CN105357600B (en) | 2018-10-23 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699904A (en) * | 2009-10-27 | 2010-04-28 | 华为技术有限公司 | Method for saving energy and system thereof |
| CN102118659A (en) * | 2009-12-30 | 2011-07-06 | 中兴通讯股份有限公司 | Method and system for saving energy in passive optical network |
| WO2011127792A1 (en) * | 2010-04-16 | 2011-10-20 | 中兴通讯股份有限公司 | Method and system for configuring subframe |
| CN103402146A (en) * | 2013-07-10 | 2013-11-20 | 上海交通大学 | Downlink energy-saving transmission system of OFDM (Orthogonal Frequency Division Multiplexing) PON (Passive Optical Network) |
| CN103647739A (en) * | 2013-10-28 | 2014-03-19 | 上海大学 | OFDM-PON uplink frame synchronization method |
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- 2015-10-21 CN CN201510682102.0A patent/CN105357600B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699904A (en) * | 2009-10-27 | 2010-04-28 | 华为技术有限公司 | Method for saving energy and system thereof |
| CN102118659A (en) * | 2009-12-30 | 2011-07-06 | 中兴通讯股份有限公司 | Method and system for saving energy in passive optical network |
| WO2011127792A1 (en) * | 2010-04-16 | 2011-10-20 | 中兴通讯股份有限公司 | Method and system for configuring subframe |
| CN103402146A (en) * | 2013-07-10 | 2013-11-20 | 上海交通大学 | Downlink energy-saving transmission system of OFDM (Orthogonal Frequency Division Multiplexing) PON (Passive Optical Network) |
| CN103647739A (en) * | 2013-10-28 | 2014-03-19 | 上海大学 | OFDM-PON uplink frame synchronization method |
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