CN104717727B - A kind of data transmission method of radio frequency sending set - Google Patents
A kind of data transmission method of radio frequency sending set Download PDFInfo
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- CN104717727B CN104717727B CN201310697431.3A CN201310697431A CN104717727B CN 104717727 B CN104717727 B CN 104717727B CN 201310697431 A CN201310697431 A CN 201310697431A CN 104717727 B CN104717727 B CN 104717727B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
- H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a kind of data transmission methods based on radio frequency sending set.General transceiver penetrates consumed energy and is significantly larger than digital circuits section, it would be desirable to be able to amount optimization；Non real-time transmission system is also easy to produce the risk of buffer heap volume data spilling, the big problem of transmission data delay in the data transmission simultaneously.The present invention preferably resolves this problem, energy-optimised adaptive modulation technology is used to data transmission procedure, system is based on the fixation handoff boundary that Adaptive Modulation is transmitted, the cut-off dafing depth g* that cooperation generates the rate R0 of data according to transmitter information source and fading channel distributed intelligence is found out is as all kind of modulations mode switching criterion, transmitter carries out power control after the completion of modulation system switching, sends data using minimum transmission power；The detection to capacity register is kept simultaneously, and general data capacity is more than default buffer fixed percentage value, and resetting cut-off channel gain is lowest-order modulation system switching threshold.
Description
Technical field
This method is related to data wireless links Transmission system, and in particular to a kind of transmission side data using Adaptive Modulation
Method achievees the purpose that save radio-frequency front-end energy consumption while efficiently using channel capacity data transmission method.
Background technique
With the development of CMOS technology, the power of supply voltage needed for digital circuit and consumption reduces many, however
Supply voltage needed for RF front-end circuit and analog circuit and the power of consumption still maintain relatively high level.It is true
On, on many transceivers, energy consumed by RF front-end circuit is significantly larger than digital circuits section.For single user point pair
Point communication system, system energy consumption by path loss and multipath fading other than being influenced, also by signal occupied bandwidth, the equal function in peak
The influence of rate, character rate, constellation size and pulse shaping filter.To save RF front-end circuit energy consumption, can guarantee
Under conditions of communication quality and buffer data are not spilt over, when channel fading is serious, pause transmission data can be to avoid consumption
Big energy；Until channel condition improves, transimission power is increased, is carried out data transmission that letter can be made full use of with high order modulation
Road capacity.
In existing communication, data can cache the of short duration time after generating in memory, retransmit away, for example use
Mobile phone sends Email or uploading pictures by WIFI wireless network, and user, which only needs to submit transformation task, gives machine operation
System sends the data to user within user's sustainable time in machine operating system.In Power Ratio Adaptive Transmission
In system, information source generates data with some fixed rate R0, and uses bigger memory (such as 32KB or 256KB), with
Just data buffer storage information source generated is in memory.If true average transmission rate generates data rate lower than information source, have
It may cause data to accumulate in both the buffers, the risk for thering are data to overflow.In addition, if deep fading occurs in a period of time
It must compare frequently, then the transmission rate of this period is lower than target transmission speed, will also result in buffer data accumulation.Even if slow
Storage is very big, and data are not overflowed, and has mass data accumulation to will also result in transmission data delay in buffer for a long time big
Problem.Optimization processing to buffer is also to consider the problems of in Wireless data transmission.
Summary of the invention
The first purpose of this invention is to propose that a kind of new method is to provide a kind of be based on adaptively for radio frequency sending set
The data transmission method of modulation technique, this adaptive modulation technology can be such that communication system obtains in energy consumption and channel capacity
Preferable balance.Second object of the present invention is to propose a kind of method for preventing buffer from overflowing.
Operating method of the invention is achieved in that
A kind of data transmission method of radio frequency sending set, which is characterized in that the method is adaptive by energy optimization
Modulation technique guarantees that lower average transmission energy consumption avoids buffer overflow problem simultaneously, includes the following steps
A. transmitter node receives the channel fading estimated value that aggregation node is fed back.
B. transmitter is according to information source data production rate R0Cut-off channel power gain is found out with fading channel distributed intelligence
Cut-off channel power gain is reduced 1dB and obtains new cut-off channel power gain g** by g*, and cut-off channel power gain is certainly
Adapt to a kind of judgement boundary of modulation system switching.
C. when carrying out data transmission, that detects whether the data volume that stores in buffer be lower than capacity register fixes hundred
Divide ratio such as 75%, the numerical value is default by actual conditions, guarantees that buffer data overflows while controlling data transmission delay and exists
Zone of reasonableness.If so, setting g** for cut-off channel power gain；If not, setting pre- for cut-off channel power gain
If lower limit value, the as handoff boundary of the used lowest-order modulation system (such as BPSK) of Adaptive Modulation.
D. detection Real-time Channel power gain whether be greater than cut-off channel power gain, if so, transmitter node according to
Which kind of modulation system the solemn decision of Real-time Channel information and cut-off channel power gain that receiving node is fed back is switched to, and emits
Machine node carries out power control simultaneously, and transmitter is emitted using minimum emissive power.
E. if not, a bit of time is transmitted in transmitter node pause, then send a very short test signaling to
Aggregation node is to test whether channel gain meets QoS requirement
F. transmitter node is ready for sending data next time according to selected modulation system and transmission power, return step a,
Recycle above-mentioned treatment process.
Non real-time data transmission scheme of the present invention had both had the advantages that various modulation handoff boundaries were easily obtained,
The good channels time slot in the system distribution time can be made full use of again, avoid transmitting data in channel deep fading.Calculate and
Simulation result shows that the average energy consumption of this programme is only most more much by 3% than theoretic Adaptive Modulation optimal case.Simultaneously
This programme can guarantee that buffer is not spilt over to the operation of buffer, and control data transmission delay in a reasonable range
It is interior.
Detailed description of the invention
Fig. 1 is the flow chart of the present invention carried out data transmission using adaptive modulation technology.
Fig. 2 is adaptive modulation technology modulation system switching threshold schematic diagram.
Specific embodiment
The present invention is further described with attached drawing combined with specific embodiments below.
Data transmission method of the present invention based on radio frequency sending set, passes through the adaptive modulation technology of energy optimization
Guarantee lower average transmission energy consumption while avoiding buffer overflow problem.
Fig. 1 is the method applied in the present invention, for using the number of adaptive modulation technology in transmission of radio links system
According to transmission process, is operated by optimization cut-off channel power gain and setting buffer and reach optimization transmission energy consumption while preventing from delaying
The purpose that storage overflows, method includes following implementation steps:
Step 1: in transmission of radio links system, the rate R of data is generated according to transmitter information source0And fading channel
Distributed intelligence finds out cut-off channel power gain g*, and cut-off gain reduction 1dB is obtained new cut-off channel power gain g**.
Step 2: when transmitter needs to send data, detect whether the data volume stored in buffer is lower than preset delay
The fixed percentage value such as 75% of storage capacity.
Step 3: if the data volume stored in buffer is lower than the preset value of capacity register, channel power will be ended
Gain is set as g**.
Step 4: if the data volume stored in buffer is higher than the preset value of capacity register, channel power will be ended
Gain is set as lower limit value.
Step 5: transmitter node receives the channel fading estimated value that aggregation node is fed back, and obtains Real-time Channel function
Rate gain.
Step 6: whether detection Real-time Channel power gain is greater than cut-off channel power gain.
Step 7: if Real-time Channel power gain is greater than cut-off channel power gain, transmitter node is saved according to reception
The Real-time Channel information and cut-off channel power gain g** decision that point is fed back are switched to which kind of modulation system, transmitter section
It puts while carrying out power control；
Step 8: if Real-time Channel power gain is less than cut-off channel power gain, transmitter node pause transmission one
Then short time sends a very short test signaling and tests whether channel gain meets communication quality to aggregation node
It is required that.
Step 9: transmitter according to after adjustment modulation system and transmission power be ready for sending data next time, return
Step 1, above-mentioned treatment process is recycled.
Fig. 2 is white the used modulation system switching threshold schematic diagram of adaptation modulation technique of the present invention.The tune that transmitter uses
Mode processed is MQAM, and order of modulation M is any one of set { 0,2,4,16,64 }, and M=0 is represented under channel deep fading
Adaptive Modulation stops transmission to save energy.
When transmitter node has data to need to be sent to receiving node, transmitter node is fed back according to receiving node
Channel gain estimated value select suitable order of modulation M and transmission power P.But if channel instantaneous fading is very big, function
Rate amplifier works when maximum power is not able to satisfy QoS requirement, stops transmission data, channel gain is waited to improve
It transmits again a bit.
In adaptive modulation technology, with the minimum target of energy consumption, channel power gain g is made into interval division to correspond to not
With order of modulation M.The range of g can be divided 5 regions: R (0), R (2), R (4), R (16) and R (64) are respectively corresponded and are not passed
It is defeated, use BPSK, 4QAM, 16QAM and 64QAM ì, week system transmission.
In radio frequency sending set, the theoretical performance result of modulation system can be used as the switching threshold of various modulation, matched
It closes the cut-off channel power gain solved to realize with lookup table mode, the section that transmitter is fallen according to actual channel power gain
Selecting modulation mode and transimission power, transimission power are selected according to the minimum value for meeting present channel power gain.Channel is real-time
Power gain then temporarily ceases transmission in the case where being less than cut-off channel power gain, one very short test signaling of transmission to
Aggregation node is to test whether channel gain meets QoS requirement.It is greater than cut-off channel power in channel realtime power gain
In the case where gain, transmitter enters modulation switching and power control link, prepares transmission data.Specific modulation switchover policy is such as
Under,
As g < g*, transmitter stops data transmission, and channel is waited to improve；
When g ∈ [g*, -81.8dB) when, transmitter use BPSK modulation system；
When g ∈ [- 81.8dB, -68.6dB) when, transmitter use 4QAM modulation system；
When g ∈ [- 68.6dB, -58.5dB) when, transmitter use 16QAM modulation system；
As g > -58.5dB, transmitter uses 64QAM modulation system.
It is an advantage of the current invention that the handoff boundary of various modulation is fixed, it is only necessary to it is deep to calculate cut-off channel fading
Degree, lookup table mode easy to use realize that implementation complexity is low.
So far oneself elaborates the present invention with reference to specific embodiment, but the present invention is not limited to these Examples.It is appreciated that this
The technical staff in field can improve the present invention without departing from the scope and spirit of the present invention.
Claims (5)
1. a kind of data transmission method of radio frequency sending set, which is characterized in that the method passes through the adaptive tune of energy optimization
Technology processed guarantees lower average transmission energy consumption, while avoiding the problem that buffer overflows, and includes the following steps
A. in transmission of radio links system, transmitter node receives the channel fading estimated value that aggregation node is fed back；
B. the rate R of data is generated according to transmitter information source0Cut-off channel power gain g is found out with fading channel distributed intelligence*,
Cut-off channel power gain is reduced into 1dB and obtains new cut-off channel power gain g**；
C. when carrying out data transmission, the fixed percentage whether data volume stored in buffer is lower than capacity register is detected
Value；If so, setting g for cut-off channel power gain**；If not, under setting preset for cut-off channel power gain
Limit value；
D. whether detection Real-time Channel power gain is greater than cut-off channel power gain, if so, transmitter node is according to reception
The Real-time Channel power gain and cut-off channel power gain g that node feeding back is returned**Which kind of modulation be switched to by decision of tabling look-up
Mode, transmitter node carry out power control simultaneously；If not, transmitter node pause transmission, waits a preset interval right
A very short test signaling is sent afterwards tests whether channel gain meets QoS requirement to aggregation node；
E. transmitter node is ready for sending data next time, return step a, circulation according to selected modulation system and transmission power
Above-mentioned treatment process；
The channel fading estimated value of the step a is the decline value of channel namely the power gain of channel.
2. the data transmission method of radio frequency sending set according to claim 1, which is characterized in that the cut-off of the step b
Channel power gain is a kind of judgement boundary of modulation system switching, and channel instantaneous fading exceeds the power amplification of transmitter node
Device maximum power then transmits stopping.
3. the data transmission method of radio frequency sending set according to claim 1, which is characterized in that slow in the step c
The operation of storage is set, and guarantee avoids buffer data from overflowing, while controlling data transmission delay.
4. the data transmission method of radio frequency sending set according to claim 1, which is characterized in that the step c lower limit
Value is used the handoff boundary of lowest-order modulation system by Adaptive Modulation, and the lowest-order modulation system is BPSK.
5. the data transmission method of radio frequency sending set according to claim 1, which is characterized in that the function in the step d
Rate control makes the transmitter under every kind of modulation using minimum emissive power.
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| CN201310697431.3A CN104717727B (en) | 2013-12-13 | 2013-12-13 | A kind of data transmission method of radio frequency sending set |
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| CN104717727A CN104717727A (en) | 2015-06-17 |
| CN104717727B true CN104717727B (en) | 2019-11-05 |
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| CN108306640B (en) * | 2018-01-12 | 2021-05-14 | 中国人民解放军火箭军工程大学 | Broadband radio frequency signal generating system |
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| CN1744481A (en) * | 2005-09-30 | 2006-03-08 | 上海贝豪通讯电子有限公司 | Adaptive transmission method in TD-SCDMA system |
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