CN100417242C - Method for determining modulation coding mode - Google Patents
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Abstract
A method for confirming modulation-coding mode includes calculating out disposable power and spectrum efficiency corresponding separately to modulation-coding mode and to each roll-off factor and setting up corresponding relation of the four, selecting out modulation-coding mode of current maximum spectrum efficiency and current disposable power corresponding to terminal from set-up corresponding relation and applying selected modulation-coding mode as modulation-coding mode used on current communication at terminal.
Description
Technical field
The present invention relates to mobile communication technology, particularly relate to a kind of method of definite modulation coding mode.
Background technology
In mobile communication system, spectrum efficiency is illustrated in the amount of information that unit bandwidth transmitted in the unit interval on the wireless transmission channel.Therefore, spectrum efficiency is to weigh a major criterion of performance in wireless communication systems quality.
Spectrum efficiency=(R
c* log
2M) bps/Hz, wherein, R
cThe speed of expression chnnel coding, M represents the exponent number of the modulation system that channel adopts, and this shows, the height of spectrum efficiency depends on modulation system and the coded system that channel adopts.Therefore, can have higher spectrum efficiency in order to ensure system, modulation and the coding techniques that adopts usually is Adaptive Modulation and Coding (AMC) technology at present.When adopting the AMC technology,, can determine under various signal interference ratio conditions and make the highest modulation coding mode of spectrum efficiency by studying the combination of various modulation and coding.
But when adopting the AMC technology to determine the modulation coding mode of channel use, prior art has only considered how to make system have higher spectrum efficiency.In order to obtain higher spectrum efficiency, often adopt the modulation system of high-order, and the modulation system of high-order can cause the peak-to-average force ratio (PAPR) of signal to become big, and PAPR is directly proportional with the power amplifier rollback of terminal, the change of PAPR greatly then can cause the change of power amplifier rollback big, thereby causes the system wireless signal cover to reduce.
As seen, prior art is only considered that the way that improves spectrum efficiency tends to cause the coverage of system wireless signal to diminish, thereby has been influenced the capacity and the performance of system greatly when determining the modulation coding mode that channel uses.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of definite modulation coding mode, so that when the system of assurance has high spectral efficiency, farthest improves the coverage of system wireless signal.
In order to achieve the above object, technical scheme of the present invention is achieved in that
A kind of method of definite modulation coding mode, this method comprises:
But A, calculate each roll-off factor and modulation coding mode and distinguish corresponding govern power and spectrum efficiency;
But B, set up each roll-off factor and modulation coding mode and the govern power that calculated according to this kind roll-off factor and modulation coding mode and the corresponding relation between the spectrum efficiency;
But C, obtain the current govern power of terminal;
D, in the corresponding relation of being set up, but select corresponding to the current govern power of terminal and the modulation coding mode of highest spectral efficiency;
E, selected modulation coding mode is defined as the modulation coding mode that the current communication of terminal is used.
In steps A, described modulation coding mode is according to the requirement of wireless communications environment different coded systems and modulation system to be made up to obtain.
In steps A, but each roll-off factor of described calculating and modulation coding mode the step of corresponding respectively govern power comprise:
A1, obtain the value that each roll-off factor and modulation coding mode are distinguished corresponding Eb/N0;
A2, obtain the value that each roll-off factor and modulation coding mode are distinguished corresponding power amplifier rollback;
If A3 is E
b, N
0Be respectively the value of linear domain with the power amplifier rollback, then with each roll-off factor and the pairing E of modulation coding mode that are obtained
b/ N
0Value and the value of power amplifier rollback multiply each other, but with resulting product as each roll-off factor and the pairing govern power of modulation coding mode;
If E
b/ N
0Be respectively decibel value with the power amplifier rollback, then with each roll-off factor and the pairing E of modulation coding mode that are obtained
b/ N
0Value and the value addition of power amplifier rollback, but with resulting and the value as each roll-off factor and the pairing govern power of modulation coding mode;
Wherein, E
bBe the required energy of the every bit of demodulation, N
0Be the power spectral density of disturbing and heat is made an uproar.
Described steps A 1 comprises: draw each roll-off factor and modulation coding mode according to each modulation coding mode emulation and distinguish corresponding E
b/ N
0Value.
In steps A, each roll-off factor of described calculating and modulation coding mode the step of corresponding respectively spectrum efficiency comprise:
Calculate each roll-off factor and modulation coding mode respectively and distinguish corresponding spectrum efficiency, wherein, β is a roll-off factor, R
cBe the speed of chnnel coding, M is the exponent number of modulation system in the modulation coding mode.
Described step C comprises: but obtain the current govern power of terminal according to the maximum transmission power of terminal, current propagation loss, user data rate and interference and hot power spectral density of making an uproar.
Described step C comprises: by log-domain calculating formula E
b-N
0+ P
Bo=P-R
b-P
L-N
0, calculate E
b-N
0+ P
BoValue, with the E that calculates
b-N
0+ P
BoBut value as the current govern power of terminal, wherein, E
bBe the required energy of the every bit of demodulation, P
BoBe the power amplifier rollback, P is the maximum transmission power of terminal, R
bBe user data rate, P
LBe current propagation loss, N0 is the power spectral density of disturbing and heat is made an uproar.
After step C, further comprise: in the corresponding relation of being set up, but select corresponding to the current govern power of terminal and the roll-off factor of highest spectral efficiency; Selected roll-off factor is defined as the roll-off factor of terminal emission forming filter.
Wherein, the step of carrying out described calculating, set up, obtain, select and determining by network side.
Wherein, the step of carrying out described calculating, set up, obtain, select and determining by terminal.
This shows, the present invention is when determining the modulation coding mode that channel is adopted, not only considered to make system to have higher spectrum efficiency, also utilize roll-off factor to reduce the influence of power amplifier rollback simultaneously, thereby improved the coverage of system wireless signal to the full extent, improve the capacity of system, improved the performance of system.
Description of drawings
Fig. 1 is the flow chart of the embodiment of the invention.
But Fig. 2 calculates the flow chart that each roll-off factor and modulation coding mode are distinguished corresponding govern power in embodiments of the present invention.
Fig. 3 is the schematic diagram when in embodiments of the present invention but the govern power of roll-off factor, modulation coding mode, terminal and the correspondence setting between the spectrum efficiency being tables of data.
Embodiment
Because prior art has only been considered the raising spectrum efficiency, and has been ignored the problem of power amplifier rollback, thereby caused not having the coverage of extended wireless signal farthest when determining modulation coding mode.And effective ways that reduce the influence of power amplifier rollback at present utilize roll-off factor exactly.Therefore, in conjunction with These characteristics, the present invention proposes a kind of method of definite modulation coding mode, its core concept is:
In the present invention, the process of determining modulation coding mode can be that to be undertaken by terminal also can be to be undertaken by network side.
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with drawings and the specific embodiments.
Fig. 1 is the flow chart of the embodiment of the invention.Referring to Fig. 1, be example with the process of determining modulation coding mode at network side, the specific implementation process of the inventive method comprises:
Step 101: modulation coding mode is set at network side.
The specific implementation process of this step is: according to the requirement of wireless communications environment, different coded systems and modulation system are made up in twos, form various modulation coding mode, formed modulation coding mode can be exemplified as: π/4QPSK 1/3 code check, π/4QPSK 2/3 code check and 16QAM 1/3 code check etc.
Step 102: distinguish corresponding govern power but calculate each roll-off factor and modulation coding mode.
Here and but the govern power of the following stated represents is can be for the power of end side modulation parameter domination.Described each roll-off factor and modulation coding mode are meant what the roll-off factor that each is the different modulation coding mode different with each carried out obtaining after the combination in any in twos.And the scope of the value of described roll-off factor is from 0 to 1.
In addition, but Fig. 2 calculates the flow chart that each roll-off factor and modulation coding mode are distinguished corresponding govern power in embodiments of the present invention.Referring to Fig. 2, the specific implementation process of this step 102 may further comprise the steps:
Here, because E
b/ N
0Value only depend on the modulation system that is adopted, irrelevant with roll-off factor and coded system, so only need obtain such as simulating corresponding E according to modulation coding mode
b/ N
0Value, thereby also just obtained under each roll-off factor the set pairing E of various modulation coding modes
b/ N
0Value.Such as, when modulation coding mode is π/4QPSK 1/3 code check, can calculate E
b/ N
0Value be 0.35, when modulation coding mode is 16QAM 1/3 code check, can calculate E
b/ N
0Value be 2.35, like this, roll-off factor that each is different and the pairing E of modulation coding mode π/4QPSK 1/3 code check
b/ N
0Value be 0.35, roll-off factor that each is different and the pairing E of modulation coding mode 16QAM1/3 code check
b/ N
0Value be 2.35, thereby finally obtain under each roll-off factor and the pairing E of modulation coding mode
b/ N
0Value.Need to prove, in this step the E that is calculated
b/ N
0Value be logarithm value.
Here, because the value of power amplifier rollback depends on the modulation system that adopted and the size of roll-off factor, so all can determine the value of a power amplifier rollback respectively according to the modulation system in each roll-off factor and the modulation coding mode, thereby finally obtain under each roll-off factor and modulation coding mode is distinguished the value of corresponding power amplifier rollback.
Need to prove, if E
b, N
0Be respectively the value of linear domain with the value of power amplifier rollback, but govern power=(E then
b/ N
0) * power amplifier rollback; If (E
b/ N
0) and the value of power amplifier rollback be respectively decibel (db) value, but govern power=(E then
b/ N
0)+power amplifier rollback; If E
b, N
0Be decibel (db) value with the value of power amplifier rollback, but govern power=E then
b-N
0+ power amplifier rollback.
In this step 2C, because resulting each roll-off factor and the pairing E of modulation coding mode
b/ N
0Value and the value of power amplifier rollback be respectively the db value, so but govern power for both and the value.
Step 103: calculate each roll-off factor and modulation coding mode and distinguish corresponding spectrum efficiency.
Here, can adopt calculating formula:
Calculate each roll-off factor and modulation coding mode respectively and distinguish corresponding spectrum efficiency, wherein, β is a roll-off factor, R
cBe the speed of chnnel coding, M is the exponent number of the modulation system that channel adopted.
Process by this step 103 as can be seen, in the present invention, when calculating the spectrum efficiency of each modulation coding mode correspondence, also utilized roll-off factor to calculate simultaneously, thereby can be by introducing the influence that roll-off factor reduces PARP, promptly reduce the influence of power amplifier rollback, thereby when the system of assurance has high spectral efficiency, farthest improved the coverage of system wireless signal.
Step 104: but the govern power of roll-off factor, modulation coding mode, terminal and the corresponding relation between the spectrum efficiency set up at network side.
Here, when setting up described corresponding relation, but be the govern power and the spectrum efficiency of the terminal that will under a kind of roll-off factor and modulation coding mode, be calculated, and set up corresponding relation between this kind roll-off factor and the modulation coding mode.Fig. 3 is the schematic diagram when in embodiments of the present invention but the govern power of roll-off factor, modulation coding mode, terminal and the correspondence setting between the spectrum efficiency being tables of data.Referring to Fig. 3, such as, but there is corresponding relation between the value 5.88 of the govern power of roll-off factor 0, modulation coding mode π/4QPSK 1/3 code check, terminal and the spectrum efficiency 0.67 four; But there is corresponding relation etc. between the value 7.9 of the govern power of roll-off factor 0.1, modulation coding mode π/4QPSK 2/3 code check, terminal and the spectrum efficiency 1.21 four.
Step 105: when terminal began to communicate by letter, network side obtained the maximum transmission power of this terminal, current propagation loss P
L, user data rate R
bAnd disturb and the hot power spectral density N that makes an uproar
0
Here, for each terminal, its maximum transmission power is a definite value, so network side can obtain the maximum transmission power of this terminal by communication process.And network side obtains current propagation loss P
L, user data rate R
bAnd disturb and the hot power spectral density N that makes an uproar
0Process be prior art, be not described in detail herein.
Step 106: network side is according to the maximum transmission power of the terminal of being obtained, current propagation loss P
L, user data rate R
bAnd disturb and the hot power spectral density N that makes an uproar
0But, calculate current govern power corresponding to this terminal.
Here, because the maximum transmission power P of terminal satisfies relational expression: P=R
b* E
b* P
Bo* P
L, wherein, R
bBe data rate; E
bBe the required energy of the every bit of demodulation; P
BoBe the power amplifier rollback; P
LBe propagation loss (comprising shade), described relational expression is corresponded to log-domain be: E
b-N
0+ P
Bo=P-R
b-P
L-N
0, because network side has obtained P, R
b, P
LAnd N
0Value, so can calculate (E
b-N
0+ P
Bo) value, thereby but also just obtained value corresponding to the current govern power of this terminal.
Step 107: network side in the corresponding relation of being set up, but select corresponding to the current govern power of terminal and the modulation coding mode of highest spectral efficiency.
Here, such as, but the value of the govern power that terminal is current is 5.8, in the corresponding relation of being set up, but exist spectrum efficiency, modulation coding mode and the roll-off factor of corresponding relation to have two groups with the value 5.8 of current govern power, first group spectrum efficiency is 0.56, and modulation coding mode is π/4QPSK1/3 code check, and roll-off factor is 0.3; Second group spectrum efficiency is 0.71, and modulation coding mode is π/4QPSK 2/3 code check, and roll-off factor is 0.4, so, in this step, because the spectrum efficiency in second group is greater than first group spectrum efficiency, therefore, select modulation coding mode in second group.
Step 108: network side uses selected modulation coding mode as the employed modulation coding mode of current channel.
Step 109: network side is sent to terminal with selected modulation coding mode, and this modulation coding mode that terminal will receive is as the employed modulation coding mode of current communication channel.
In addition, preferably, network side can also be further in the corresponding relation of being set up, but select corresponding to the current govern power of terminal and the roll-off factor of highest spectral efficiency, and, selected roll-off factor is defined as the roll-off factor of terminal emission forming filter, thereby further improves the coverage of system wireless signal.
When the modulation coding mode of determining at each terminal to be adopted, the present invention all can adopt above-mentioned process shown in Figure 1 to realize, therefore, when can be in the spectrum efficiency of the system of assurance the highest, improves the coverage of system wireless signal greatly.
In above-mentioned process shown in Figure 1, be the process of carrying out definite modulation coding mode of the present invention by network side, thereby when the system of assurance has high spectral efficiency, farthest improve the coverage of system wireless signal.Need to prove, in the present invention, also can carry out the process of definite modulation coding mode of the present invention by terminal, the process of its specific implementation and the principle of above-mentioned process shown in Figure 1 are identical, that is to say, be to carry out the process of above-mentioned steps 101 to step 108 by terminal, and in step 109, by terminal selected modulation coding mode is sent to network side, this modulation coding mode that network side will receive is as the employed modulation coding mode of current communication channel.
In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the method for a definite modulation coding mode is characterized in that, this method comprises:
But A, calculate each roll-off factor and modulation coding mode and distinguish corresponding govern power and spectrum efficiency;
But B, set up each roll-off factor and modulation coding mode and the govern power that calculated according to this kind roll-off factor and modulation coding mode and the corresponding relation between the spectrum efficiency;
But C, obtain the current govern power of terminal;
D, in the corresponding relation of being set up, but select corresponding to the current govern power of terminal and the modulation coding mode of highest spectral efficiency;
E, selected modulation coding mode is defined as the modulation coding mode that the current communication of terminal is used.
2. method according to claim 1 is characterized in that, in steps A, described modulation coding mode is according to the requirement of wireless communications environment different coded systems and modulation system to be made up to obtain.
3. method according to claim 1 is characterized in that, in steps A, but each roll-off factor of described calculating and modulation coding mode the step of corresponding respectively govern power comprise:
A1, obtain each roll-off factor and modulation coding mode and distinguish corresponding E
b/ N
0Value;
A2, obtain the value that each roll-off factor and modulation coding mode are distinguished corresponding power amplifier rollback;
If A3 is E
b, N
0Be respectively the value of linear domain with the power amplifier rollback, then with each roll-off factor and the pairing E of modulation coding mode that are obtained
b/ N
0Value and the value of power amplifier rollback multiply each other, but with resulting product as each roll-off factor and the pairing govern power of modulation coding mode;
If E
b/ N
0Be respectively decibel value with the power amplifier rollback, then with each roll-off factor and the pairing E of modulation coding mode that are obtained
b/ N
0Value and the value addition of power amplifier rollback, but with resulting and the value as each roll-off factor and the pairing govern power of modulation coding mode;
Wherein, E
bBe the required energy of the every bit of demodulation, N
0Be the power spectral density of disturbing and heat is made an uproar.
4. method according to claim 3 is characterized in that, described steps A 1 comprises: draw each roll-off factor and modulation coding mode according to each modulation coding mode emulation and distinguish corresponding E
b/ N
0Value.
5. method according to claim 1 is characterized in that, in steps A, each roll-off factor of described calculating and modulation coding mode the step of corresponding respectively spectrum efficiency comprise: pass through calculating formula
Calculate each roll-off factor and modulation coding mode respectively and distinguish corresponding spectrum efficiency, wherein, β is a roll-off factor, R
cBe the speed of chnnel coding, M is the exponent number of modulation system in the modulation coding mode.
6. method according to claim 1 is characterized in that, described step C comprises: but obtain the current govern power of terminal according to the maximum transmission power of terminal, current propagation loss, user data rate and interference and hot power spectral density of making an uproar.
7. method according to claim 6 is characterized in that, described step C comprises: by log-domain calculating formula E
b-N
0+ P
Bo=P-R
b-P
L-N
0, calculate E
b-N
0+ P
BoValue, with the E that calculates
b-N
0+ P
BoBut value as the current govern power of terminal, wherein, E
bBe the required energy of the every bit of demodulation, P
BoBe the power amplifier rollback, P is the maximum transmission power of terminal, R
bBe user data rate, P
LBe current propagation loss, N
0Be the power spectral density of disturbing and heat is made an uproar.
8. method according to claim 1 is characterized in that, further comprises after step C: in the corresponding relation of being set up, but select corresponding to the current govern power of terminal and the roll-off factor of highest spectral efficiency; Selected roll-off factor is defined as the roll-off factor of terminal emission forming filter.
9. according to any described method in the claim 1 to 8, it is characterized in that the step of carrying out described calculating, set up, obtain, select and determining by network side.
10. according to any described method in the claim 1 to 8, it is characterized in that the step of carrying out described calculating, set up, obtain, select and determining by terminal.
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| CN102201886B (en) | 2010-03-22 | 2014-03-12 | 中兴通讯股份有限公司 | Pre-coding matrix selection method and system for closed loop multiple input multiple output system |
| CN102469566B (en) * | 2010-11-12 | 2014-06-11 | 中兴通讯股份有限公司 | Wireless resource allocation method and device |
| CN103581092B (en) * | 2012-08-08 | 2016-12-21 | 中国移动通信集团公司 | A kind of method and apparatus reducing cognitive radio out-of-band interference |
| CN105763289A (en) * | 2014-12-17 | 2016-07-13 | 南宁富桂精密工业有限公司 | Data transmission device and method |
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| CN1466297A (en) * | 2002-06-13 | 2004-01-07 | 华为技术有限公司 | Self-adaptive modulating and coding method |
| KR20040050756A (en) * | 2002-12-09 | 2004-06-17 | 한국전자통신연구원 | Method for determining adaptive modulation coding option of high-speed imt-200 and computer readable medium storing thereof |
| KR20040057686A (en) * | 2002-12-26 | 2004-07-02 | 엘지전자 주식회사 | Adaptive modulation coding apparatus for mobile communication device |
| EP1515460A1 (en) * | 2003-04-08 | 2005-03-16 | Matsushita Electric Industrial Co., Ltd. | Base station device and adaptive modulation method |
| CN1667987A (en) * | 2004-03-12 | 2005-09-14 | 上海贝尔阿尔卡特股份有限公司 | Adaptive communicating method and device |
-
2006
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Patent Citations (5)
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|---|---|---|---|---|
| CN1466297A (en) * | 2002-06-13 | 2004-01-07 | 华为技术有限公司 | Self-adaptive modulating and coding method |
| KR20040050756A (en) * | 2002-12-09 | 2004-06-17 | 한국전자통신연구원 | Method for determining adaptive modulation coding option of high-speed imt-200 and computer readable medium storing thereof |
| KR20040057686A (en) * | 2002-12-26 | 2004-07-02 | 엘지전자 주식회사 | Adaptive modulation coding apparatus for mobile communication device |
| EP1515460A1 (en) * | 2003-04-08 | 2005-03-16 | Matsushita Electric Industrial Co., Ltd. | Base station device and adaptive modulation method |
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