CN100502254C - Self-adaptive modulation mode selection and power distribution method - Google Patents

Self-adaptive modulation mode selection and power distribution method Download PDF

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CN100502254C
CN100502254C CNB2004100386817A CN200410038681A CN100502254C CN 100502254 C CN100502254 C CN 100502254C CN B2004100386817 A CNB2004100386817 A CN B2004100386817A CN 200410038681 A CN200410038681 A CN 200410038681A CN 100502254 C CN100502254 C CN 100502254C
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CN1571293A (en
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李立华
郭志恒
张平
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Beijing Samsung Telecommunications Technology Research Co Ltd
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Beijing University of Posts and Telecommunications
Beijing Samsung Telecommunications Technology Research Co Ltd
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Abstract

The invention discloses a self-adapting modulation mode selecting and power allocating method in wireless communication system, where on the basis of the current-selected modulation mode and allocated power of each self-adapting unit, by iterative allocation process, selecting the self-adapting unit that has the best efficiency to continue increasing unit bit transmission power as meeting the preset performance requirement, then changing its modulation mode into adjacent higher order modulation mode and labeling the higher order modulation mode and the bit increment carried by the current modulation mode as bit number allocated for this time, and allocating the self-adapting unit the required power meeting the performance requirement in the corresponding higher order modulation mode; as the transmission bit B to be allocated has been allocated or the emission power P to be allocated has been allocated, or the left power is not enough for any self-adapting unit to increase modulation order, ending the iterative process and transferring the left unallocated bit or power to the whole bit number or usable power for the next allocation.

Description

Adaptive modulation system is selected and power distribution method
Technical field
The present invention relates to a kind of adaptive modulation system that is used for wireless communication system selects and power distribution method.
Background technology
Comprise that the broadband multimedia services of video, audio service and Internet service will become the main business of future mobile communications carrying, so future mobile communications is more and more higher to the requirement of transmission rate, frequency spectrum had become one of resource the most valuable in the radio communication already.
The transmission plan that legacy communications system adopts is all at the channel most severe condition, because the time-varying characteristics of mobile channel when the user is in than the deep fade district, even adopt error correction coding also may error correction to fail, cause system's error performance to descend.When the user was in better channel status, the amount of information that is transmitted can be significantly smaller than channel capacity again, caused the waste of channel resource.
Link adaptation techniques is having very strong advantage aspect the raising channel spectrum utilance.Link adaptation techniques is selected transmission parameter adaptively according to the decline time-varying characteristics of mobile channel.Under the good situation of channel quality, improve transmission rate, and when bad channel quality, reduce transmission rate, thereby improve jamproof robustness.Technology such as existing power control, automatic repeat request (ARQ), adaptive coding and modulating (AMC), adaptive power and Bit Allocation in Discrete all belong to the category of link circuit self-adapting.The advantage that adopts link adaptation techniques is under the criterion of keeping the requirement of different business specific QoS, can improve the average band efficiency and the transmission rate of system, and improves power system capacity.
Adaptive modulation technology is a kind of of link adaptation techniques, its main design is dynamically to change modulation system by the parameters such as decline degree of research wireless channel, all make channel capacity reach maximum or systematic function at any time and reach best, thereby improve the availability of frequency spectrum of the rate of information throughput and system effectively.Wherein a kind of implementation is that system comes selecting modulation mode according to the signal to noise ratio and the predefined signal-noise ratio threshold that detect, the power that sends signal is constant, this mode is called the adaptive modulation system based on decision threshold, and this is a kind of self-adaptive modulation method of rough adjustment modulation system.Another kind of implementation is that system is selected and power division according to the adaptive modulation system of carrying out of channel characteristics, and it is not only adjusted modulation system and also transmitted power is carried out adaptive adjustment, is called Adaptive Modulation and power division.
There are three kinds of following strategies in Adaptive Modulation and power division, promptly under certain BER requires:
(1) sends gross power certain (limited), the throughput maximum of how to distribute limited power to make transmission.
(2) average throughput is certain, and how allocation bit makes the transmitted power minimum.
(3) on average send under the limited and average throughput certain condition of gross power, how to distribute power and bit to make system effectiveness higher.
Real system is the application of (3) kind situation often.
In method based on strategy (1) and (2), available modulation system often requires the bit increment of the every symbols carry of adjacent modulation system to equate, for example one group of (BPSK, QPSK, 8PSK, the bit increment is 1 bit 16QAM), and for example one group of (QPSK, 16QAM, 64QAM, the bit increment is 2 bits 256QAM), and does not have effective solution for the unequal situation of bit increment of the every symbols carry of adjacent modulation system.
The scheme that the present invention proposes is based on the bit and the power distribution method of the strategy (3) of more approaching reality, and is applicable to the unequal situation of bit increment of the every symbols carry of adjacent modulation system, thereby makes this method have higher using value.
Summary of the invention
At the problem that exists in existing power and the Bit Allocation in Discrete scheme, the present invention proposes the method for a kind of Adaptive Modulation and power division.
According to an aspect of the present invention, provide a kind of adaptive modulation system that is used for wireless communication system to select and power distribution method, described communication system comprises a plurality of adaptive units, and each described adaptive unit comprises a plurality of Basic Transmission Unit, and described method comprises step:
(1) calculates the basic wireless transmission unit that comprises in each described adaptive unit according to channel parameter and count Δ N, and require and Power Limitation according to system's average throughput on the current slot, calculate K total bit number Btotal and available total transmitted power P that adaptive unit transmits on the current slot Total
(2) with B TotalIndividual bit and P TotalThe distribution of power on K * Δ N basic wireless transmission unit is reduced to B = B total ΔN Individual bit and P = P total ΔN Power, distribute on a described K adaptive unit, to carry out self adaptation;
(3) select suitable modulation system and transmitting power according to the gain on K the adaptive unit for each adaptive unit, be chosen in by the iteration distribution process and satisfy pre-determined characteristics and require to continue down to increase the best adaptive unit of unit bit transfer power efficiency, change its modulation system into exponent number adjacent more high-order modulating, and will be more the bit increment that carries of high-order modulating and current modulation mode be labeled as the bit number that this iteration dispenses, and distribute to described adaptive unit and under corresponding more high-order modulating, satisfy the required power of performance requirement;
(4) distribute or transmitting power P to be allocated distributes when a B to be allocated transmitted bit, all finish described iterative process, and will remain unappropriated bit or power changes on the total bit number and available horsepower that next time distributes.
According to another aspect of the present invention, provide a kind of adaptive modulation system that is used for wireless communication system to select and power distribution method, described communication system comprises a plurality of adaptive units, and each described adaptive unit comprises a plurality of Basic Transmission Unit, and described method comprises step:
(1) calculates the basic wireless transmission unit that comprises in each described adaptive unit according to channel parameter and count Δ N, and require and Power Limitation according to system's average throughput on the current slot, calculate K total bit number B that adaptive unit transmits on the current slot TotalWith available total transmitted power P Total
(2) with B TotalIndividual bit and P TotalThe distribution of power on K * Δ N basic wireless transmission unit is reduced to B = B total ΔN Individual bit and P = P total ΔN Power, distribute on a described K adaptive unit, to carry out self adaptation;
(3) select suitable modulation system and transmitting power according to the gain on K the adaptive unit for each adaptive unit, be chosen in by iterative process and satisfy pre-determined characteristics and require to continue down to increase the best adaptive unit of unit bit transfer power efficiency, change its modulation system into exponent number adjacent more high-order modulating, and will be more the bit increment that carries of high-order modulating and current modulation mode be labeled as the bit number that this iteration dispenses, and distribute to described adaptive unit and under corresponding more high-order modulating, satisfy the required power of performance requirement;
(4) when not enough any one adaptive unit of dump power in order to improve modulation system, though power and bit all have residue, but still finish described iterative process, and will remain unappropriated bit and power and change on the total bit and available horsepower that self adaptation is distributed next time.
The method according to this invention allows each different bit number that distributes, to the modulation system that can use without limits, the reduction signaling consumption, thus the raising systematic function makes power efficiency higher.
Description of drawings
Fig. 1 has illustrated the adaptive unit and the basic wireless transmission unit of single antenna single carrier Adaptable System;
Fig. 2 has illustrated the adaptive unit and the basic wireless transmission unit of single antenna multicarrier Adaptive Transmission system;
Fig. 3 has illustrated the adaptive unit and the basic wireless transmission unit of MIMO multicarrier Adaptive Transmission system;
Fig. 4 has illustrated adaptive modulation system selection of the present invention and power division in Application in Communication Systems;
Fig. 5 has illustrated to realize the program flow diagram of the inventive method.
Embodiment
In order clearly to describe technical scheme of the present invention, at first define two notions of basic wireless transmission unit and adaptive unit.
Basic wireless transmission unit is the minimum unit of realizing a data modulation symbol transmission, and for example a carrier wave in OFDM symbol period of ofdm system is exactly a basic wireless transmission unit of this system.
The transmission unit group that adaptive unit is made up of a plurality of basic wireless transmission unit adjacent on time, frequency or space.The characteristic of channel of the basic wireless transmission unit experience in adaptive unit is in time less than coherence time, on frequency less than coherence bandwidth, therefore the characteristic of channel thinks constant substantially on an adaptive unit, so the transmission parameter on the basic wireless transmission unit of adaptive unit inside is invariable, and transmission parameter is a self-adapting changeable between adaptive unit.
For example, transmission parameter can only self adaptation adjustment on time dimension in the single carrier a single aerial system, and adaptive unit can be a time slot, as shown in Figure 1.The self adaptation of transmission parameter is adjusted on time dimension and the frequency dimension and carries out simultaneously in the ofdm system, and adaptive unit can be the two-dimentional unit by a period of time and band frequency definition, as shown in Figure 2.The MIMO technology has been introduced the space dimension, this moment adaptive unit can be one on the antenna a period of time and the three-dimensional element of band frequency definition, but the concrete definition difference of adaptive unit in the different MIMO designs, as shown in Figure 3.
The method of Adaptive Modulation of the present invention and power division can be widely used in mimo system, ofdm system, MIMO-OFDM system.According to the present invention, suppose to have on the current slot a plurality of basic wireless transmission unit, may be the subcarrier in the ofdm system, also may be the transmitting antenna in the mimo system, or the summation of all subcarriers on all transmitting antennas in the MIMO-OFDM system.
Adaptive modulation system of the present invention is selected and the performing step of power distribution method comprises:
At first, calculate the basic wireless transmission unit that comprises in each adaptive unit according to channel parameter and count Δ N, calculate K total bit number B that adaptive unit transmits on the current slot according to requirement of system's average throughput and Power Limitation on the current slot TotalWith available total transmitted power P Total
Then, with B TotalIndividual bit and P TotalThe distribution of power on K * Δ N basic wireless transmission unit is reduced to B = B total ΔN Individual bit and P = P total ΔN Power, be that according to the gain on K the adaptive unit each adaptive unit selects suitable modulation system and transmitted power.
Then, according to current channel and adaptive unit gain measurement,, find out the abominable channel of transmission characteristic by threshold judgement, do not use this channel transmission information for the time being, other adaptive units that can transmit information are selected suitable modulation system and transmitting power by following step.
The concrete grammar of threshold judgement has multiple, for example absolute gain value judgement, relative gain ratio judgement etc.
Subsequently, in iteration each time, on the power basis of the modulation system of the current selection of each adaptive unit and distribution, performance according to the adjacent more high-order modulating of the spendable order of modulation current of this adaptive unit with it, can adopt the mode or the real-time Calculation Method of tabling look-up, select and satisfying the best adaptive unit of continuation increase unit bit transfer power efficiency under certain performance requirement, change its modulation system into exponent number adjacent more high-order modulating, and will be more the bit increment that carries of high-order modulating and current modulation mode be labeled as the bit number that this iteration dispenses, this number does not require equal in each iterative process, so the spendable modulation system of this method does not require that adjacent exponent number difference equates.Distribute to this adaptive unit simultaneously and under corresponding more high-order modulating, satisfy the required power of performance requirement, enter next iteration then, up to the situation that iteration occurs stopping.
In the iteration assigning process, selected interim modulation system of each adaptive unit current iteration and transmitting power are upgraded with each iteration result, and this interim result became final modulation system and the transmitting power of selecting of each adaptive unit after iteration finished.In tabling look-up, form can be various, should construct based on the theoretical performance or the result of the test of modulation system.
At last, in the iterative process of modulation system selection and power division, when transmitted bit B to be allocated distributes or transmitting power P to be allocated distributes, finishing iteration all, and will remain unappropriated bit or power changes on the total bit number and available horsepower that next time distributes.
Perhaps, when not enough any one adaptive unit of dump power in order to improve modulation system, though power and bit all have residue, but still finishing iteration, and will remain unappropriated bit and power changes on the total bit and available horsepower of self adaptation distribution next time.
Hereinafter, the present invention will describe a kind of concrete iteration self-adapting modulation and power distribution method.
If include K adaptive unit on the current slot, comprise Δ N basic wireless transmission unit in each adaptive unit.For clearly being defined as follows symbol and structure: *, narration represents that variable is the address type variable; * a → b represents to get the b variable in the direction structure body of a address, and the modulation system structure is defined as follows:
Struct MOD
{
Int M; / * M represent the bit number * of every symbols carry/
Float SNR; / * SNR reach when representing modulation system for M the minimum SNR* that BER requires/
}；
The needed modulation system structure of system is deposited as shown in table 1, and Ml represents the bit number of the every symbols carry of l kind modulation system, wherein M 1＜M 2＜...＜M L
Memory address The bit number of every symbols carry Reach the minimum SNR that BER requires
1 M 1 SNR 1
2 M 2 SNR 2
... ... ...
L M L SNR L
Table 1
System is two variablees of describing current transmission parameter situation of each wireless transmission unit definition: *Mod kAnd P k, *Mod kThe memory address of representing the modulation system that current k unit selected, P kRepresent that current is the transmitted power that k unit distributes.
Simultaneously, system is the variable of next step transmission parameter change situation of two predictions of each basic wireless transmission unit definition: Δ b kWith Δ P k, Δ b kRepresent the bit number that next step may increase, then Δ b k∈ { M J+1-M j, j=1 ..., L-1,0}, Δ P kIf representing next step brings up to adjacent more high-order modulating and will reach the power that BER requires needs to increase.
Concrete iteration distribution method is as follows:
The first step: i=0, initialization
*mod k＝0，P k＝0，k＝1，2，…，K，
p＝0，
g k = g k if g k max i = 1,2 , · · · K ( g i ) > α g if g k max i = 1,2 , · · · K ( g i ) ≤ α
k＝1，2，…K。Wherein g is a constant, satisfies SNR 1 g / δ n 2 > P ,
α is that the factor of a supposition is used for deleting the certain little adaptive unit of gain, and deleted adaptive unit does not participate in Adaptive Modulation and power division.
Δb k＝( *mod k+1)→M， ΔP k = ( mod k * + 1 ) → SNR g k / δ n 2 k = 1,2 , · · · , K , Be used for adding up the current power that has dispensed
Second step: the i=i+1 carries out iteration and distributes
(current state: be about to distribute i bit)
If min k ΔP k > P - p , The modulation system of then representing not enough any one unit of dump power improves, and stops distributing, and i=i-1 jumped to for the 3rd step.
At set { Δ P k| Δ P kCarry out bit and power division among＜the P-p}:
Find
Figure C200410038681D00132
Satisfy
Figure C200410038681D00133
(begin for Unit allocation bit and power)
Figure C200410038681D00135
Figure C200410038681D00136
Figure C200410038681D00137
Figure C200410038681D00138
(current state: distributed i bit)
If i=B, then expression has distributed bit waiting for transmission, stops distributing, and jumps to for the 3rd step.
(upgrade the variable quantity for the treatment of of bit on each unit and power, prepare) for distribute next time
For set { Δ b k| Δ b k≠ 0} carries out variable update
&Delta;b k = ( mod k * + 1 ) &RightArrow; M , mod k * < L , and , ( mod k * + 1 ) &RightArrow; M < B - i 0 , others , i . e . mod k * = L , or , ( mod k * + 1 ) &RightArrow; M > B - i
&Delta;P k = ( mod k * + 1 ) &RightArrow; SNR - ( mod k * ) &RightArrow; SNR g k / &delta; n 2 , &Delta;b k &NotEqual; 0 C &GreaterEqual; P , &Delta;b k = 0 , k = 1,2 , &CenterDot; &CenterDot; &CenterDot; , K
Turned back to for second step.
The 3rd step: stop distributing
The remaining bits B-i of system, dump power P-p, remaining power resource and bit transfer task change next time period processing over to.Be that the bit number that need transmit next time period is B+ (B-i), available power is P+ (P-p).
The advantage of method of the present invention is:
(1) bit number of the every sub-distribution of traditional Bit distribution method equates, therefore the modulation system that can use is had certain restriction, requires adjacent the differing of bit number of each symbol-modulated of different modulating mode to equate. This method has been broken above-mentioned restriction, allows the different bit number of every sub-distribution, to the modulation system that can use without limits.
(2) added in this method gain judge the factor be used for the very little adaptive unit of gain cast out need not, further improve systematic function, make power efficiency higher.
(3) to be equivalent to each allocation bit number be 1 optimal bit and power distribution method to the allocation result of this method.
(4) this method more is applicable to practical communication system, can satisfy system to the restriction of power with to the requirement of transmission information amount.
(5) this method breaking and in the situation that does not affect systematic function, to reduce signaling consumption the selecting modulation mode restriction.
(6) this method can realize that implementation complexity is lower based on the mode of tabling look-up.

Claims (16)

1. an adaptive modulation system that is used for wireless communication system is selected and power distribution method, and described communication system comprises a plurality of adaptive units, and each described adaptive unit comprises a plurality of Basic Transmission Unit, and described method comprises step:
(1) calculates the basic wireless transmission unit that comprises in each described adaptive unit according to channel parameter and count Δ N, and require and Power Limitation according to system's average throughput on the current slot, calculate K total bit number B that adaptive unit transmits on the current slot TotalWith available total transmitted power P Total
(2) with B TotalIndividual bit and P TotalThe distribution of power on K * Δ N basic wireless transmission unit is reduced to B = B total &Delta;N Individual bit and P = P total &Delta;N Power, distribute on a described K adaptive unit, to carry out self adaptation;
(3) select suitable modulation system and transmitting power according to the gain on K the adaptive unit for each adaptive unit, be chosen in by the iteration distribution process and satisfy pre-determined characteristics and require to continue down to increase the best adaptive unit of unit bit transfer power efficiency, change its modulation system into exponent number adjacent more high-order modulating, and will be more the bit increment that carries of high-order modulating and current modulation mode be labeled as the bit number that this iteration dispenses, and distribute to described adaptive unit and under corresponding more high-order modulating, satisfy the required power of performance requirement;
(4) distribute or transmitting power P to be allocated distributes when a B to be allocated transmitted bit, all finish described iterative process, and will remain unappropriated bit or power changes on the total bit number and available horsepower that next time distributes.
2. method according to claim 1, the characteristic of channel of basic wireless transmission unit experience that wherein each adaptive unit comprised be in time less than coherence time, on frequency less than coherence bandwidth.
3. method according to claim 1, wherein the transmission parameter on the basic wireless transmission unit that each adaptive unit comprised is invariable, and transmission parameter is a self-adapting changeable between adaptive unit.
4. method according to claim 1 also comprises step:
According to the gain measurement of the current characteristic of channel and adaptive unit, by the threshold judgement method, find out the abominable channel of transmission characteristic, do not use described channel transmission information for the time being.
5. method according to claim 4, the concrete grammar of wherein said threshold judgement are that decision method is compared in absolute gain value decision method or relative gain.
6. method according to claim 1, wherein the mode or the real-time calculation mode of tabling look-up by employing is chosen in and satisfies the pre-determined characteristics requirement best adaptive unit of continuation increase unit bit transfer power efficiency down.
7. method according to claim 1, the bit increment in wherein each iterative process is also unequal.
8. method according to claim 1, wherein in described iteration distribution process, selected interim modulation system of each adaptive unit current iteration and transmitting power are upgraded with each iteration result, and the interim result after iteration finishes becomes final modulation system and the transmitting power of selecting of each adaptive unit.
9. an adaptive modulation system that is used for wireless communication system is selected and power distribution method, and described communication system comprises a plurality of adaptive units, and each described adaptive unit comprises a plurality of Basic Transmission Unit, and described method comprises step:
(1) calculates the basic wireless transmission unit that comprises in each described adaptive unit according to channel parameter and count Δ N, and require and Power Limitation according to system's average throughput on the current slot, calculate K total bit number B that adaptive unit transmits on the current slot TotalWith available total transmitted power P Total
(2) with B TotalIndividual bit and P TotalThe distribution of power on K * Δ N basic wireless transmission unit is reduced to B = B total &Delta;N Individual bit and P = P total &Delta;N Power, distribute on a described K adaptive unit, to carry out self adaptation;
(3) select suitable modulation system and transmitting power according to the gain on K the adaptive unit for each adaptive unit, be chosen in by iterative process and satisfy pre-determined characteristics and require to continue down to increase the best adaptive unit of unit bit transfer power efficiency, change its modulation system into exponent number adjacent more high-order modulating, and will be more the bit increment that carries of high-order modulating and current modulation mode be labeled as the bit number that this iteration dispenses, and distribute to described adaptive unit and under corresponding more high-order modulating, satisfy the required power of performance requirement;
(4) when not enough any one adaptive unit of dump power in order to improve modulation system, though power and bit all have residue, but still finish described iterative process, and will remain unappropriated bit and power and change on the total bit and available horsepower that self adaptation is distributed next time.
10. method according to claim 9, the characteristic of channel of basic wireless transmission unit experience that wherein each adaptive unit comprised be in time less than coherence time, on frequency less than coherence bandwidth.
11. method according to claim 9, wherein the transmission parameter on the basic wireless transmission unit that each adaptive unit comprised is invariable, and transmission parameter is a self-adapting changeable between adaptive unit.
12. method according to claim 9 also comprises step:
According to the gain measurement of the current characteristic of channel and adaptive unit, by the threshold judgement method, find out the abominable channel of transmission characteristic, do not use described channel transmission information for the time being.
13. being absolute gain value decision method or relative gain, method according to claim 12, the concrete grammar of wherein said threshold judgement compare decision method.
14. method according to claim 9, wherein the mode or the real-time calculation mode of tabling look-up by employing is chosen in and satisfies the pre-determined characteristics requirement best adaptive unit of continuation increase unit bit transfer power efficiency down.
15. method according to claim 9, the bit increment in wherein each iterative process is also unequal.
16. method according to claim 9, wherein in described iteration distribution process, selected interim modulation system of each adaptive unit current iteration and transmitting power are upgraded with each iteration result, and the interim result after iteration finishes becomes final modulation system and the transmitting power of selecting of each adaptive unit.
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CN101064542B (en) * 2006-04-30 2010-12-08 中兴通讯股份有限公司 MIMO OFDML aunching aerial selection and self-adapting modulation approach of system
CN101534176B (en) * 2008-03-11 2012-12-19 中兴通讯股份有限公司 Self-adaptive antenna mode control method and device thereof
CN101572948B (en) * 2009-06-09 2011-05-04 华为技术有限公司 Uplink scheduling method in wireless communication system, base station and wireless communication system
CN102137479B (en) * 2011-03-02 2014-07-23 清华大学 Method for controlling downlink power in distributed antenna architecture
CN106465287B (en) * 2014-06-26 2019-12-06 华为技术有限公司 Method, equipment and system for determining and adjusting modulation format and carrier power
CN107241124B (en) * 2017-05-02 2021-01-08 南京航空航天大学 Power distribution-based high energy efficiency adaptive modulation method in distributed antenna system

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