CN103856293B - A kind of system of selection of modulation coding mode and device - Google Patents
A kind of system of selection of modulation coding mode and device Download PDFInfo
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- CN103856293B CN103856293B CN201210524160.7A CN201210524160A CN103856293B CN 103856293 B CN103856293 B CN 103856293B CN 201210524160 A CN201210524160 A CN 201210524160A CN 103856293 B CN103856293 B CN 103856293B
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Abstract
This application discloses a kind of system of selection of modulation coding mode, it is characterised in that including：Under the BLER that systematic function is specified, any MCS values i of correspondence determines corresponding demodulation threshold under awgn channelAnd corresponding SINR value during BLER the and MCS values i is measured in systems in practiceAccording toWithDifference determine MCS values be i when threshold shiftUnder the BLER, MCS values are the selection threshold value of i under determining awgn channelAnd willWithAnd as MCS values under actual channel for i selection threshold valueAccording to the selection threshold valueIt is modulated the selection of coded system.Using the application, the mismatch problem that the MCS of real system can be avoided to select threshold value to determine with awgn channel MCS threshold values improves throughput of system.
Description
Technical field
The application is related to the communication technology, more particularly to a kind of modulation coding mode（MCS）System of selection and device.
Background technology
In an ofdm system, due to the frequency selectivity of channel, Signal to Interference plus Noise Ratio (the SINR Signal to of each subband
Interference plus Noise Ratio) value changes clearly in whole frequency band.High speed additionally, due to terminal is moved
Dynamic and HARQ retransmits the time selective fading for causing can all cause the SINR in a decoding block to change.In order to select so that
The maximized modulator approach of throughput of system and coded system（MCS Modulation and Coding Scheme）, it is necessary to accurate
True prediction link performance（BLER Block Error Rate）.And predict link performance, then use effective SNR mapping methods
（ESM Effective SNR Mapping）So that the symbol SNR value changed in different channels one and same coding block is mapped to
One effective SNR value.With the relation curve of corresponding BLER can be approximately under awgn channel this effective SNR value by ESM
The relation curve of SNR-BLER.Thus various fading channel MCS selections can be equivalent into awgn channel MCS selections to be ground
Study carefully.
Under the conditions of actual beehive net, system is except by white Gaussian noise（AWGN）Influence, can also be subject to homologous ray
Or the interference of different system.So, when actually carrying out MCS selections, the SNR for using is SINR.It is when system has multiple interference and dry
Disturb randomization it is preferable when, the influence of interference can be with the equivalent influence into Gauss white noise, i.e., now for system, interference can be seen
Into being raising for Gauss white noise.If without specified otherwise, for statement is convenient, being write SNR as SINR herein.
The equivalent signal-to-noise ratio mapping method based on mutual information for using at present（MIESM Mutual Information-
based ESM）It is that the soft symbol SINR of n change in a code block is mapped to a SINR.In general ofdm system, often
Obtained by being calculated after SINR on individual symbol is the equilibrium treatment by signal by channel and receiver, on frequency domain, referred to as
Output SINR.
Under normal circumstances, the threshold value that the MCS selections of system are used is obtained by the BLER performances under link level platform awgn channel
.And link performance BLER is that system input SINR, i.e. input signal are made an uproar with AWGN with the SINR used in SINR change curves
10 times of logarithm values of the power ratio of sound.For awgn channel, input SNR is higher with the output SINR goodnesses of fit.But for decline
Channel, output SINR is influenceed by channel gain, instantaneously（One radio frames）Output SINR and input SINR difference can
Can be larger.Therefore the MCS threshold values for being calculated using output SINR and link performance curve are modulated coding mode selection to be present not
Matching problem.
In some wireless systems, further filtering process is done to output SINR.I.e. according to certain in a spectral window
Filtering factor by export SINR be filtered, filter length is often in units of time domain radio frames.Using processing after filtering
SINR and the MCS threshold values that calculate of link performance curve be modulated coding mode selection and there is also mismatch problem.
The content of the invention
The application provides a kind of modulation coding mode system of selection and device, and the MCS of real system can be avoided to select threshold
The mismatch problem that value determines with awgn channel MCS threshold values, improves throughput of system.
A kind of system of selection of modulation coding mode, including：
Under the BLER that systematic function is specified, any MCS values i of correspondence determines corresponding demodulation threshold under awgn channelAnd corresponding SINR value during BLER the and MCS values i is measured in systems in practiceAccording to
WithDifference determine MCS values be i when threshold shift
Under the BLER, MCS values are the selection threshold value of i under determining awgn channelAnd willWithAnd as MCS values under actual channel for i selection threshold value
According to the selection threshold valueIt is modulated the selection of coded system.
It is preferred that the basisWithDifference determine MCS values be i when threshold shiftIncluding：
WillWithDifference add default protection intervalAs the threshold shift.
A kind of selection device of modulation coding mode, including：AWGN emulation MCS demodulation thresholds generation unit, actual test
MCS demodulation thresholds generation unit, MCS selections threshold adjustment unit, awgn channel MCS selection threshold values generation unit, actual channel
MCS selects threshold value generation unit and modulation coding mode select unit；
The AWGN emulates MCS demodulation threshold generation units, under the BLER that is specified in systematic function, correspondence to be any
MCS value i, determine corresponding demodulation threshold under awgn channel
The actual test MCS demodulation threshold generation units, for measuring BLER the and MCS values in systems in practice
Corresponding SINR value during i；
The MCS selects threshold adjustment unit, for according to describedWith it is describedDifference determine MCS
Threshold shift when value is i
The awgn channel MCS selects threshold value generation unit, under the BLER, MCS to take under determining awgn channel
It is worth the selection threshold value for i
The actual channel MCS selects threshold value generation unit, for by described inWith it is describedSum
It is the selection threshold value of i as MCS values under actual channel
The modulation coding mode select unit, for according to the selection threshold valueIt is modulated coding staff
The selection of formula.
It is preferred that described device further includes protection interval generation unit, for any MCS values i of correspondence, preservation sets
The protection interval put
The MCS selects threshold adjustment unit, be further used for byWithDifference add the protection
IntervalAs the threshold shift.
As seen from the above technical solution, in the application, according to the demodulation threshold under awgn channel and identical MCS and BLER bars
The SINR value of real system measurement under part, it is determined that selecting the threshold shift of threshold value for correcting MCS；Then, in awgn channel
Threshold shift is added on the basis of lower MCS selections threshold value, threshold value is selected as the MCS under real system channel, and foundation should
Threshold value is modulated the selection of coded system.It is poor using the SINR between awgn channel and actual channel by this processing mode
Value, is modified to MCS selections threshold value under awgn channel, so as to MCS selections threshold value under avoiding awgn channel and actual channel
Mismatch problem.
Brief description of the drawings
Fig. 1 is the particular flow sheet of modulation coding mode system of selection in the application；
Fig. 2 is the concrete structure diagram of modulation coding mode selection device in the application.
Specific embodiment
In order that the purpose of the application, technological means and advantage become more apparent, the application is done below in conjunction with accompanying drawing
Further describe.
In the application, the equivalent SINR value to being used to carry out MCS selections under awgn channel is modified, after recycling amendment
Threshold value the deviation of threshold value is selected so as to the MCS compensated under awgn channel and actual channel.
Generally, according to performance requirements, can there is a BLER for specifying, under the BLER, according to current SINR
Relation with multiple SINR threshold values selects MCS.In the following embodiments, illustrated so that BLER values are as x as an example.Fig. 1 is
The particular flow sheet of modulation coding mode system of selection in the application.As shown in figure 1, the method includes：
Step 101, any MCS values i of correspondence, determines corresponding demodulation threshold under awgn channelAnd in reality
Corresponding SINR value during identical BLER and MCS values is measured in system
Wherein, 0≤i<N-1, the every kind of value for MCS, processing mode all same, i.e., according to the place of step 101-103
Reason flow determines in this selection threshold value of MCS under actual channel under MCS values.
This step is used to determine corresponding SINR when MCS=i, BLER=x under awgn channel, that is, demodulation thresholdSpecific acquisition modes belong to the common technology means of those skilled in the art, just repeat no more here.
Corresponding SINR when measuring MCS=i, BLER=x in systems in practice, is designated asSpecific BLER passes through system
Measurement is obtained, and SINR reports acquisition by physical layer.
Step 102, according toWithDifference determine MCS values be i when threshold shift
Most simply, can be byWithDifference directly as threshold shiftOr, examine
Consider the limitation of field testing environment, Ke YiWithDifference on the basis of, add one protection between
EveryFor as the tolerance between field testing environment and actual operating environment, to adapt to worse channel circumstance,
I.e.Wherein, protection intervalSize can be surveyed according to outfield
Test ring border and field testing data volume determine.Specific set-up mode the application is not limited, can be by those skilled in the art
It is configured as needed.
Step 103, MCS values are the selection threshold value of i under determining awgn channelAnd willWithAnd as MCS values under actual channel for i selection threshold value
Awgn channel use MCS=i selection threshold values that equivalent SNR methods draw forNamely background technology
In for carrying out the selection threshold value that MCS selections are used.As it was previously stated, the selection threshold value in the selection threshold value and real system is not
Matching, therefore, determine that awgn channel and the MCS of actual channel select threshold value by step 101 and 102 treatment in the application
Side-play amount On the basis of add the side-play amountIt is as MCS values under actual channel
Selection threshold value during iI.e.
Actual selection threshold value under various MCS values is determined by above-mentioned steps 101-103, then is entered by step 104
Row MCS is selected.
Step 104, according to the actual selection threshold value under various MCS valuesCarry out MCS selections.
The mode that this step carries out MCS selections is identical with existing mode, and the foundation for simply carrying out selection selects threshold value not
Only be again under awgn channel it is equivalent outBut the foregoing revised actual selection threshold obtained by treatment
ValueSo, because the selection threshold value has avoided awgn channel with the selection threshold value of actual channel application
It is inconsistent, therefore, it is more accurate that the MCS carried out according to revised actual selection threshold value is selected to, and improves throughput of system.
So far, the MCS system of selection flows in the application terminate.
Present invention also provides a kind of MCS selection devices, the MCS systems of selection for implementing above-mentioned the application.Fig. 2 is should
The structure chart of MCS selection devices.As shown in Fig. 2 the device includes：AWGN emulation MCS demodulation thresholds generation unit 1, actual survey
Examination MCS demodulation thresholds generation unit 2, MCS selection threshold adjustment unit 3, awgn channel MCS selection threshold values generation unit 4, reality
Channel MCS selection threshold values generation unit 5 and modulation coding mode select unit 6.
Wherein, AWGN emulation MCS demodulation thresholds generation unit 1 is right under generation awgn channel for utilizing chain channel platform
Answer MCS=i, BLER=x demodulation threshold
Actual test MCS demodulation thresholds generation unit 2, for according to actual field testing result, generating outfield wireless ring
Under border, correspondence MCS=i, BLER=x demodulation threshold
MCS selects threshold adjustment unit 3, for emulating the output valve of MCS demodulation thresholds generation unit 1 according to AWGNWith the output valve of actual test MCS demodulation thresholds generation unit 2Difference generation MCS=i selection adjusting thresholds
Value
Awgn channel MCS selection threshold values generation unit 4, for using SNR equivalent method combination awgn channel BLER curves
Provide SNR MCS selection threshold values
Actual channel MCS selection threshold values generation unit 5, for selecting the output valve of threshold adjustment unit 4 using MCSWith the equivalent output valve of SNRMCS threshold values generation unit 5Generation outfield MCS=i selection SINR threshold values
Modulation coding mode select unit 6, for the selection according to the output of actual channel MCS selection threshold values generation unit 5
Threshold valueIt is modulated the selection of coded system.
In addition, with above-mentioned MCS systems of selection analogously, it is contemplated that field testing environment and real system operating environment
Difference, the MCS selection devices may further include protection interval SINR generation units 7, for generating protection interval SINR valueMCS select threshold adjustment unit, be further used for byWithDifference add protection intervalAs threshold shift.
It is above-mentioned to be implementing for the application, implemented from above-mentioned, by the application, can be to awgn channel
Under the equivalent SINR that draws be modified, i.e., add an offset to actual MCS threshold values, to select suitable MCS selections threshold value
The handling capacity of raising system.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Within god and principle, any modification, equivalent substitution and improvements done etc. should be included within the scope of protection of the invention.
Claims (4)
1. a kind of system of selection of modulation coding mode, it is characterised in that including：
Under the BLER that systematic function is specified, any MCS values i of correspondence determines corresponding demodulation threshold under awgn channelAnd corresponding SINR value during BLER the and MCS values i is measured in systems in practiceAccording toWithDifference determine MCS values be i when threshold shiftUnder the BLER, it is determined that
MCS values are the selection threshold value of i under awgn channelAnd willWithAnd as actual
MCS values are the selection threshold value of i under channel
According to the selection threshold valueIt is modulated the selection of coded system.
2. method according to claim 1, it is characterised in that the basisWithDifference determine
Threshold shift when MCS values are iIncluding：
WillWithDifference plus tolerance between default field testing environment and actual operating environmentAs the threshold shift.
3. a kind of selection device of modulation coding mode, it is characterised in that including：AWGN emulation MCS demodulation thresholds generation unit,
Actual test MCS demodulation thresholds generation unit, MCS selections threshold adjustment unit, awgn channel MCS selections threshold value generation unit,
Actual channel MCS selects threshold value generation unit and modulation coding mode select unit；
The AWGN emulates MCS demodulation threshold generation units, under the BLER that is specified in systematic function, any MCS of correspondence to take
Value i, determines corresponding demodulation threshold under awgn channel
The actual test MCS demodulation threshold generation units, for measuring in systems in practice during BLER the and MCS values i
Corresponding SINR value；
The MCS selects threshold adjustment unit, for according to describedWith it is describedDifference determine MCS values
Threshold shift during for i
The awgn channel MCS selects threshold value generation unit, under the BLER, determining awgn channel under MCS values be i
Selection threshold value
The actual channel MCS selects threshold value generation unit, for by described inWith it is describedAnd conduct
MCS values are the selection threshold value of i under actual channel
The modulation coding mode select unit, for according to the selection threshold valueIt is modulated coded system
Selection.
4. device according to claim 3, it is characterised in that described device further includes protection interval generation unit,
For any MCS values i of correspondence, the tolerance between the field testing environment and actual operating environment for setting is preserved
The MCS selects threshold adjustment unit, be further used for byWithDifference plus between the protection
EveryAs the threshold shift.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210524160.7A CN103856293B (en) | 2012-12-07 | 2012-12-07 | A kind of system of selection of modulation coding mode and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210524160.7A CN103856293B (en) | 2012-12-07 | 2012-12-07 | A kind of system of selection of modulation coding mode and device |
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| CN103856293A CN103856293A (en) | 2014-06-11 |
| CN103856293B true CN103856293B (en) | 2017-06-06 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104468026B (en) * | 2013-09-24 | 2018-04-27 | 普天信息技术研究院有限公司 | The system of selection of Modulation and Coding Scheme and device |
| CN105634655B (en) * | 2014-10-27 | 2019-03-22 | 普天信息技术有限公司 | A kind of method and system of MCS selection adjusting thresholds |
| CN106230767B (en) * | 2016-08-31 | 2019-03-29 | 电子科技大学 | A kind of adaptive modulation coding method based on double Block Error Rates and signal-to-noise ratio difference |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1790966A (en) * | 2004-12-17 | 2006-06-21 | 中兴通讯股份有限公司 | Self-adaptive code modulating method |
| CN101615974A (en) * | 2008-06-27 | 2009-12-30 | 富士通株式会社 | The method for designing and the device that are used for the modulation code set of communication system |
| CN102790654A (en) * | 2011-05-16 | 2012-11-21 | 普天信息技术研究院有限公司 | Method for determining downlink transmission MCS (Modulating and Coding Scheme) |
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| US20030039226A1 (en) * | 2001-08-24 | 2003-02-27 | Kwak Joseph A. | Physical layer automatic repeat request (ARQ) |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1790966A (en) * | 2004-12-17 | 2006-06-21 | 中兴通讯股份有限公司 | Self-adaptive code modulating method |
| CN101615974A (en) * | 2008-06-27 | 2009-12-30 | 富士通株式会社 | The method for designing and the device that are used for the modulation code set of communication system |
| CN102790654A (en) * | 2011-05-16 | 2012-11-21 | 普天信息技术研究院有限公司 | Method for determining downlink transmission MCS (Modulating and Coding Scheme) |
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