CN102142875A - Adaptive bit loading and power allocation method for broadband CoMP (coordinative multiple point) transmission - Google Patents
Adaptive bit loading and power allocation method for broadband CoMP (coordinative multiple point) transmission Download PDFInfo
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Abstract
The invention relates to an adaptive bit loading and power allocation method for broadband CoMP (coordinative multiple point) transmission, belonging to the technical field of wireless communication. The method comprises the following steps: performing flat fading channel processing on an equivalent MIMO (multiple input multiple output) channel of a user in a wireless communication network at a fixed frequency point so as to obtain a channel of a coordinative base station for the user; performing block diagonal-singular value decomposition on the current channel matrix; and finally performing adaptive bit loading and power allocation. According to the power allocation method provided by the invention, MQAM (multiple quadrature amplitude modulation) is performed on different sub-channels, thus the method is easy to use practically and has performance close to that of infinite constellation modulation; by utilizing the method provided by the invention, optimization of bit loading and power allocation is realized based on different sub-channel gains, and the minimal allocation of the sending power is utilized as a goal, thus the entire transmission performance of the communication system is further enhanced; and moreover, the adaptive modulation method provided by the invention is low in complexity and is very suitable for the broadband multi-base station coordinative CoMP system.
Description
Technical field
The present invention relates to the adaptive bit loading and the power distribution method of a kind of broadband cooperative multipoint transmission, belong to wireless communication technology field.
Background technology
In the LTE-Advance of identical networking system, interference among adjacent cells has limited the service quality and the throughput of Cell Edge User.For the availability of frequency spectrum of further raising system, improve the service quality and the throughput of Cell Edge User, must adopt correlation technique to reduce the interference of minizone effectively.Coordinate multipoint in the wireless communication field (Coordinative Multiple Point, hereinafter to be referred as CoMP) transmission technology is the technology that present LTE-Advanced has bright prospects, it can avoid or reduce presence of intercell interference effectively on the basis that keeps system high-frequency spectrum utilance as far as possible.CoMP is as improving the especially important means of cell edge throughput of cell throughout, technology mainly comprises two classes at present: interference coordination dispatching technique (Coordinated Scheduling, hereinafter to be referred as CoMP-CS) and combined signal treatment technology (Joint Processing is hereinafter to be referred as CoMP-JP).Wherein the combined signal treatment technology is by the collaboration communication of adjacent multiple spot, with virtual multiple-input and multiple-output (hereinafter to be referred as the MIMO) structure of the common formation of the user in the cooperation cell coverage, and then use existing multiuser MIMO detection technique that these users in collaboration are carried out sending uniting of signal and uniting reception, thereby reduce the interference of minizone, improve the throughput of Cell Edge User and the average throughput of system.
OFDM (Frequency Division Multiplexing is hereinafter to be referred as OFDM) technology utilization orthogonality modulation signal provides higher spectrum efficiency, be the 4th generation broadband wireless communications one of main application technology.The benefit of utilization OFDM is to allow each subchannel be the arrowband flat fading channel.If yet a certain subchannel gains is low then can bring higher bit error rate, therefore be necessary to utilize the relative performance overall performance of subchannel elevator system preferably Here it is adaptive modulation technology according to different channel gains.Adaptive modulation technology is a kind of important techniques, and comparing with the uncoded scheme of non-self-adapting has increased data rate, and under the prerequisite that the channel information of hypothesis transmitting terminal and receiving terminal can be predicted, transmitting terminal and receiving terminal use the modulation scheme that consults.The technology for self-adaptively transmitting that tradition is optimized is generally at the frequency selective channel and under the constraint of fixed transmission power thereby subchannel is carried out water filling distribution realization Shannon capacity.Yet, although distributing, water filling can reach optimum allocation, and it is continuous that it sets the constellation size granularity, and this is difficult to realize utilization in reality, and does not also have report at present at the multi-user MIMO-OFDM adaptive modulation technology of broadband Synergistic multi-point system.
Summary of the invention
The objective of the invention is to propose the adaptive bit loading and the power distribution method of a kind of broadband cooperative multipoint transmission, is the parallel channel of parallel multi according to flow transmission by the associating precoding technique in the CoMP system signal Combined Treatment with the equivalence of multiuser MIMO channel, know fully under the channel status situation making a start, a kind of low-complicacy self-adaptive modulation technique of launching minimum power under the constraints of fixed rate and given bit error rate that satisfies is proposed, realize than bit loading and power division optimization based on different subchannel gains, thus further elevator system overall performance.
The adaptive bit loading and the power distribution method of the broadband cooperative multipoint transmission that the present invention proposes may further comprise the steps:
(1) establish and comprise B cooperative base station and K user in the cordless communication network, each cooperative base station has M
TIndividual transmitting antenna, each user has M
RIndividual reception antenna, if wireless communication system has N frequency, for k user, transmit the block of information that contains N frequency constantly at an OFDM symbol, this block of information is through after the pre-coding matrix conversion, through layer mapping and carrier wave mapping, form OFDM symbol and add Cyclic Prefix again, add that the OFDM symbol of Cyclic Prefix passes through M
TIndividual transmitting antenna is sent to the user; After the user receives OFDM symbol, remove Cyclic Prefix, carry out the discrete Fourier transform and the codeword decoding that prelists successively, obtain judgment variables to received signal, thus
(2) on n the frequency of above-mentioned steps (1)
Carry out flat fading channel and handle, on this frequency, obtain cooperative base station b k user's the current complex radical matrix of taking a message
B=1 wherein, 2 ..., B, k=1,2 ..., K, and then obtain the channel matrix H={ H of all cooperative base station to all users
1 T, H
2 T..., H
K T}
T, wherein
Be the current channel matrix of all cooperative base station to k user, ()
TBe transpose of a matrix;
(3) to above-mentioned k user's current channel matrix H
kCarry out piece diagonal angle-singular value decomposition, detailed process is as follows:
(3-1) k user carried out H
kThe piece diagonal angle decompose, obtain
Wherein
() H is the conjugate transpose of matrix, does not promptly comprise H
kScale be (K-1) M
R* BM
TExtended channel matrices,
For
Left singular matrix,
For
The non-zero singular value,
With
Be respectively and comprise
Before
Individual right singular vector and after
The matrix of individual right singular vector, order is got in rank (.) representative, according to
Constitute
The kernel orthogonal basis, promptly
I=1,2 ..., K, i ≠ k then for the channel of all cooperative base station to all users, rebulids an equivalent matrix, and this matrix has the form of following block diagonalization:
The dia{} representing matrix is a diagonalizable matrix;
(3-2) to above-mentioned k user's block diagonalization matrix
Carry out singular value decomposition, obtain
U wherein
kFor
Left singular matrix,
λ
K, iFor
The non-zero singular value,
With
Be respectively and comprise
Preceding L
kIndividual right singular vector and back (BM
T-L
k) matrix of individual right singular vector, according to
K user's multiple data stream multi-input multi-ouput channel is decomposed into parallel subchannel;
(3-3) and (3-2) according to step (3-1)
And U
k, obtain all cooperative base station and be to the associating pre-coding matrix that k user sends signal
With decoding matrix be G
k=U
k H, all cooperative base station and the equivalence of the channel between all users handled through each user's associating pre-coding matrix and decoding matrix are each customer traffic parallel sub-channels;
(4) repeating step (2) and (3) obtain the equivalent K * M on all frequencies
RIndividual parallel sub-channels, and obtain the＜l on n the frequency, k〉singular value of individual subchannel is λ
L, k[n], l=1,2 ..., M
R, k=1,2 ..., K, n=1,2 ..., N, the bit number that defines k user's distribution under each OFDM symbol is B
k, k=1,2 ..., K adopts the M-ary orthogonal amplitude modulation(PAM), and order of modulation is M=2,4,16,64,256, introduce
Be the signal-noise ratio threshold relevant, wherein function with modulation
SER is the bit error rate to provisioning request;
(5) according to the result of above-mentioned steps (4), carry out adaptive bit loading and power division, concrete steps are as follows:
(5-1) each subchannel carries out bits of original loading and power division:
(5-1-1) calculate the＜l on n the frequency, k〉bit number that carries of individual subchannel initial loading
Wherein
(5-1-2) above-mentioned initial loading bit number is rounded to the constellation size of qualification
b
L, k[n] ∈ 0,1,2,4,6,8};
(5-1-3) calculate the＜l on n the frequency, k〉initial power of individual sub-channel allocation
e
L, k(0) [n]=0;
(5-1-4) calculate the＜l under n the frequency, k〉the distribution power increment of individual subchannel, according to planisphere size variable step calculating sub-channel power increment, make GNR
L, k[n]=SNR
L, k[n]/GAP is as 0＜b
L, k[n]≤2 o'clock, promptly to change step-length be 1 to constellation figure, then power increment is
As 2＜b
L, k[n]≤8 o'clock, promptly to change step-length be 2 to constellation figure, then power increment is
(5-2) behind the bits of original loading and power division according to above-mentioned steps (5-1), k user has the bit number that loads altogether and is on N frequency
K=1,2 ..., K is to B
Total, kAnd B
kSize judge, if B
Total, k=B
k, then bits of original load and power division for finally than bit loading and power division, as if B
Total, k≠ B
k, then carry out following steps:
(5-2-1) if B
Total, k＞B
k, then according to the power increment in the above-mentioned steps (5-1-4), select the subchannel of power increment maximum, and establish with the corresponding loading bit number of this channel i and be
When 0＜i≤2, go 1 bit to regulate with 1 pair of this subchannel of step-length, corresponding 1 bit that deducts of total bit number of k user's loading, i.e. b
i-1 → b
i, B
Total, k-1 → B
Total, kWhen 2＜i≤8, go 2 bits to regulate with 2 pairs of these subchannels of step-length, corresponding 2 bits that deduct of total bit number of k user's loading, i.e. b
i-2 → b
i, B
Total, k-2 → B
Total, k
(5-2-2) if B
Total, k＜B
k, then according to the power increment in the above-mentioned steps (5-1-4), select the subchannel of power increment minimum, and the loading bit number i that establishes this channel correspondence is
Wherein,
When 0＜i≤2, increase 1 bit with 1 pair of this subchannel of step-length and regulate, corresponding increase by 1 bit of total bit number of k user's loading, i.e. b
i+ 1 → b
i, B
Total, k+ 1 → B
Total, kWhen 2＜i≤8, increase 2 bits with 2 pairs of these subchannels of step-length and regulate, corresponding increase by 2 bits of total bit number of k user's loading, i.e. b
i+ 2 → b
i, B
Total, k+ 2 → B
Total, k
(5-2-3) repeat above-mentioned (5-2-1) or (5-2-2) step to B
Total, k=B
k, bit and power obtain self adaptation and distribute on each subchannel of each each frequency of user, obtain the＜l on n the frequency, k〉and the loading bit number of individual subchannel is
Distribute power
For
The adaptive bit loading and the power distribution method of a kind of broadband cooperative multipoint transmission that the present invention proposes provide 5 kinds of M-ary orthogonal amplitude modulation(PAM)s at different subchannels, are easy to the reality utilization, and performance approaches unlimited constellation modulation; The inventive method realizes than bit loading and power division optimization based on different subchannel gains, minimizes with transmitted power and is assigned as target, thereby further promoted the overall transfer performance of communication system; Self-adaptive modulation method complexity of the present invention is low, is highly suitable for the CoMP system of broadband multi-base station cooperative.
Description of drawings
Fig. 1 is adaptive bit loading and a power division FB(flow block) in the inventive method.
Cooperative base station and telex network schematic diagram in the broadband multi-base station cooperative system when Fig. 2 is to use the inventive method.
Embodiment
The adaptive bit loading and the power distribution method of a kind of broadband cooperative multipoint transmission that the present invention proposes, its FB(flow block) may further comprise the steps as shown in Figure 1:
(1) establish cordless communication network and comprise B cooperative base station and K user, each base station has M
TIndividual transmitting antenna, each user has M
RIndividual reception antenna, if wireless way system has N frequency, for k user, transmit the block of information that contains N frequency constantly at an OFDM symbol, this block of information is through after the pre-coding matrix conversion, through layer mapping and carrier wave mapping, form the OFDM symbol and add Cyclic Prefix again, pass through M afterwards
TIndividual transmitting antenna is sent to the user; The user removes Cyclic Prefix after receiving the OFDM symbol, carries out the discrete Fourier transform and the codeword decoding that prelists successively, obtains judgment variables to received signal, obtains the broad-band channel between all cooperative base station and k user thus
The equivalent block diagonal matrix
Wherein
Be the equivalent mimo channel of k user at n frequency.Thus, if adopt the piece diagonal angle to analyze, for ofdm system, only needing all channel equivalences is the subchannel of N frequency, can be with the method continuation research of the subchannel on each frequency according to flat fading channel.
(2) based on the analysis of above step (1), on n frequency
Carry out flat fading channel and handle, obtain cooperative base station b k user's the current complex radical matrix of taking a message
B=1 wherein, 2 ..., B, k=1,2 ..., K; Thereby obtain the channel matrix H={ H of all cooperative base station to all users
1 T, H
2 T..., H
K T}
T, wherein
Be the current channel matrix of all cooperative base station to k subscriber equipment, ()
TBe transpose of a matrix;
(3) to above-mentioned k user's current channel matrix H
kCarry out piece diagonal angle-singular value decomposition, detailed process is as follows:
(3-1) k user carried out H
kThe piece diagonal angle decompose, obtain
Wherein
() H is the conjugate transpose of matrix, does not promptly comprise H
kScale be (K-1) M
R* BM
TExtended channel matrices,
For
Left singular matrix,
For
The non-zero singular value,
With
Be respectively and comprise
Before
Individual right singular vector and after
The matrix of individual right singular vector, order is got in rank (.) representative.According to
Constitute
The kernel orthogonal basis, promptly
I=1,2 ..., K, i ≠ k then for the channel of all cooperative base station to all users, rebulids an equivalent matrix, and this matrix has the form of following block diagonalization:
The dia{} representing matrix is a diagonalizable matrix;
(3-2) to above-mentioned k user's block diagonalization matrix
Carry out singular value decomposition, obtain
U wherein
kFor
Left singular matrix,
λ
K, iFor
The non-zero singular value,
With
Be respectively and comprise
Preceding L
kIndividual right singular vector and back (BM
T-L
k) matrix of individual right singular vector, according to
K user's multiple data stream mimo channel is decomposed into parallel subchannel;
(3-3) and (3-2) according to step (3-1)
And U
k, obtain all cooperative base station and be to the associating pre-coding matrix that k user sends signal
With decoding matrix be G
k=U
k H, all cooperative base station and the equivalence of the channel between all users handled through each user's associating pre-coding matrix and decoding matrix are each customer traffic parallel sub-channels;
(4) for the channel matrix on N the frequency all repeating step (2) and (3), obtain the equivalent K * M on all frequencies
RIndividual parallel sub-channels, and obtain the＜l on n the frequency, k〉singular value of individual subchannel is λ
L, k[n], l=1,2 ..., M
R, k=1,2 ..., K, n=1,2 ..., N, the bit number that defines k user's distribution under each OFDM symbol is B
k, k=1,2 ..., K adopts the MQAM modulation, and order of modulation is M=2,4,16,64,256, introduce
Be the signal-noise ratio threshold relevant, wherein function with modulation
SER is the bit error rate to provisioning request;
(5) according to the result of above-mentioned steps (4), carry out adaptive bit loading and power division, concrete steps are as follows:
(5-1) each subchannel carries out bits of original loading and power division:
(5-1-1) calculate the＜l on n the frequency, k〉bit number that carries of individual subchannel initial loading
Wherein
(5-1-2) above-mentioned initial loading bit number is rounded to the constellation size of qualification
b
L, k[n] ∈ 0,1,2,4,6,8};
(5-1-3) calculate the＜l on n the frequency, k〉initial power of individual sub-channel allocation
e
L, k(0) [n]=0;
(5-1-4) calculate the＜l under n the frequency, k〉the distribution power increment of individual subchannel, according to planisphere size variable step calculating sub-channel power increment, make GNR
L, k[n]=SNR
L, k[n]/GAP is as 0＜b
L, k[n]≤2 o'clock, promptly to change step-length be 1 to constellation figure, then power increment is
As 2＜b
L, k[n]≤8 o'clock, promptly to change step-length be 2 to constellation figure, then power increment is
(5-2) behind the bits of original loading and power division according to above-mentioned steps (5-1), k user has the bit number that loads altogether and is on N frequency
K=1,2 ..., K is to B
Total, kAnd B
kSize judge, if B
Total, k=B
k, then bits of original load and power division for finally than bit loading and power division, as if B
Total, k≠ B
k, then still have bit to regulate and distribute, this adjusting is minimised as target with power division, and the difference of the constellation dimensional variation that falls at the bit that loads on each frequency and the different step-lengths of corresponding selection, and concrete steps are as follows:
(5-2-1) if B
Total, k＞B
k, then according to the power increment in the above-mentioned steps (5-1-4), select the subchannel of power increment maximum, and establish with the corresponding loading bit number of this channel i and be
When 0＜i≤2, go 1 bit to regulate with 1 pair of this subchannel of step-length, corresponding 1 bit that deducts of total bit number of k user's loading, i.e. b
i-1 → b
i, B
Total, k-1 → B
Total, kWhen 2＜i≤8, go 2 bits to regulate with 2 pairs of these subchannels of step-length, corresponding 2 bits that deduct of total bit number of k user's loading, i.e. b
i-2 → b
i, B
Total, k-2 → B
Total, k
(5-2-2) if B
Total, k＜B
k, then according to the power increment in the above-mentioned steps (5-1-4), select the subchannel of power increment minimum, and the loading bit number i that establishes this channel correspondence is
Wherein,
When 0＜i≤2, increase 1 bit with 1 pair of this subchannel of step-length and regulate, corresponding increase by 1 bit of total bit number of k user's loading, i.e. b
i+ 1 → b
i, B
Total, k+ 1 → B
Total, kWhen 2＜i≤8, increase 2 bits with 2 pairs of these subchannels of step-length and regulate, corresponding increase by 2 bits of total bit number of k user's loading, i.e. b
i+ 2 → b
i, B
Total, k+ 2 → B
Total, k
(5-2-3) repeat above-mentioned (5-2-1) or (5-2-2) step to B
Total, k=B
k, bit and power obtain self adaptation and distribute on each subchannel of each each frequency of user, obtain the＜l on n the frequency, k〉and the loading bit number of individual subchannel is
Distribute power
For
Claims (1)
1. the adaptive bit loading of a broadband cooperative multipoint transmission and power distribution method is characterized in that this method may further comprise the steps:
(1) establish and comprise B cooperative base station and K user in the cordless communication network, each cooperative base station has M
TIndividual transmitting antenna, each user has M
RIndividual reception antenna, if wireless communication system has N frequency, for k user, transmit the block of information that contains N frequency constantly at an OFDM symbol, this block of information is through after the pre-coding matrix conversion, through layer mapping and carrier wave mapping, form OFDM symbol and add Cyclic Prefix again, add that the OFDM symbol of Cyclic Prefix passes through M
TIndividual transmitting antenna is sent to the user; After the user receives OFDM symbol, remove Cyclic Prefix, carry out the discrete Fourier transform and the codeword decoding that prelists successively, obtain judgment variables to received signal, obtain the broad-band channel between all cooperative base station and k user thus
The equivalent block diagonal matrix
Wherein
Be the equivalent multi-input multi-ouput channel of k user at n frequency;
(2) on n the frequency of above-mentioned steps (1)
Carry out flat fading channel and handle, on this frequency, obtain cooperative base station b k user's the current complex radical matrix of taking a message
B=1 wherein, 2 ..., B, k=1,2 ..., K, and then obtain the channel matrix H={ H of all cooperative base station to all users
1 T, H
2 T..., H
K T}
T, wherein
Be the current channel matrix of all cooperative base station to k user, ()
TBe transpose of a matrix;
(3) to above-mentioned k user's current channel matrix H
kCarry out piece diagonal angle-singular value decomposition, detailed process is as follows:
(3-1) k user carried out H
kThe piece diagonal angle decompose, obtain
Wherein
() H is the conjugate transpose of matrix, does not promptly comprise H
kScale be (K-1) M
R* BM
TExtended channel matrices,
For
Left singular matrix,
For
The non-zero singular value,
With
Be respectively and comprise
Before
Individual right singular vector and after
The matrix of individual right singular vector, order is got in rank (.) representative, according to
Constitute
The kernel orthogonal basis, promptly
I=1,2 ..., K, i ≠ k then for the channel of all cooperative base station to all users, rebulids an equivalent matrix, and this matrix has the form of following block diagonalization:
The diag{} representing matrix is a diagonalizable matrix;
(3-2) to above-mentioned k user's block diagonalization matrix
Carry out singular value decomposition, obtain
U wherein
kFor
Left singular matrix,
λ
K, iFor
The non-zero singular value,
With
Be respectively and comprise
Preceding L
kIndividual right singular vector and back (BM
T-L
k) matrix of individual right singular vector, according to
K user's multiple data stream multi-input multi-ouput channel is decomposed into parallel subchannel;
(3-3) and (3-2) according to step (3-1)
And U
k, obtain all cooperative base station and be to the associating pre-coding matrix that k user sends signal
With decoding matrix be G
k=U
k H, all cooperative base station and the equivalence of the channel between all users handled through each user's associating pre-coding matrix and decoding matrix are each customer traffic parallel sub-channels;
(4) repeating step (2) and (3) obtain the equivalent K * M on all frequencies
RIndividual parallel sub-channels, and obtain the＜l on n the frequency, k〉singular value of individual subchannel is λ
L, k[n], l=1,2 ..., M
R, k=1,2 ..., K, n=1,2 ..., N, the bit number that defines k user's distribution under each OFDM symbol is B
k, k=1,2 ..., K adopts the M-ary orthogonal amplitude modulation(PAM), and order of modulation is M=2,4,16,64,256, introduce
Be the signal-noise ratio threshold relevant, wherein function with modulation
SER is the bit error rate to provisioning request;
(5) according to the result of above-mentioned steps (4), carry out adaptive bit loading and power division, concrete steps are as follows:
(5-1) each subchannel carries out bits of original loading and power division:
(5-1-1) calculate the＜l on n the frequency, k〉bit number that carries of individual subchannel initial loading
Wherein
(5-1-2) above-mentioned initial loading bit number is rounded to the constellation size of qualification
b
L, k[n] ∈ 0,1,2,4,6,8};
(5-1-3) calculate the＜l on n the frequency, k〉initial power of individual sub-channel allocation
e
L, k(0) [n]=0;
(5-1-4) calculate the＜l under n the frequency, k〉the distribution power increment of individual subchannel, according to planisphere size variable step calculating sub-channel power increment, make GNR
L, k[n]=SNR
L, k[n]/GAP is as 0＜b
L, k[n]≤2 o'clock, promptly to change step-length be 1 to constellation figure, then power increment is
As 2＜b
L, k[n]≤8 o'clock, promptly to change step-length be 2 to constellation figure, then power increment is
(5-2) behind the bits of original loading and power division according to above-mentioned steps (5-1), k user has the bit number that loads altogether and is on N frequency
K=1,2 ..., K is to B
Total, kAnd B
kSize judge, if B
Total, k=B
k, then bits of original load and power division for finally than bit loading and power division, as if B
Total, k≠ B
kThen carry out following steps:
(5-2-1) if B
Total, k＞B
k, then according to the power increment in the above-mentioned steps (5-1-4), select the subchannel of power increment maximum, and establish with the corresponding loading bit number of this channel i and be
When 0＜i≤2, go 1 bit to regulate with 1 pair of this subchannel of step-length, corresponding 1 bit that deducts of total bit number of k user's loading, i.e. b
i-1 → b
i, B
Total, k-1 → B
Total, kWhen 2＜i≤8, go 2 bits to regulate with 2 pairs of these subchannels of step-length, corresponding 2 bits that deduct of total bit number of k user's loading, i.e. b
i-2 → b
i, B
Total, k-2 → B
Total, k
(5-2-2) if B
Total, k＜B
k, then according to the power increment in the above-mentioned steps (5-1-4), select the subchannel of power increment minimum, and the loading bit number i that establishes this channel correspondence is
Wherein,
When 0＜i≤2, increase 1 bit with 1 pair of this subchannel of step-length and regulate, corresponding increase by 1 bit of total bit number of k user's loading, i.e. b
i+ 1 → b
i, B
Total, k+ 1 → B
Total, kWhen 2＜i≤8, increase 2 bits with 2 pairs of these subchannels of step-length and regulate, corresponding increase by 2 bits of total bit number of k user's loading, i.e. b
i+ 2 → b
i, B
Total, k+ 2 → B
Total, k
(5-2-3) repeat above-mentioned (5-2-1) or (5-2-2) step to B
Total, k=B
k, bit and power obtain self adaptation and distribute on each subchannel of each each frequency of user, obtain the＜l on n the frequency, k〉and the loading bit number of individual subchannel is
Distribute power
For
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| WO2013107219A1 (en) * | 2012-01-21 | 2013-07-25 | Zte Corporation | Cooperative Multi-Point Modulation (CoMP-M): Method and Apparatus using Base Station Modulation with Cooperative Multi-point Transmitting and Receiving in a Cellular System |
| CN103634033A (en) * | 2012-08-23 | 2014-03-12 | 中兴通讯股份有限公司 | Method and apparatus for generating fading channel of coordinated multi-point transmission/reception |
| CN104066186A (en) * | 2014-06-25 | 2014-09-24 | 西安电子科技大学 | CoMP mode data transfer mode under limited capacity |
| CN104506290A (en) * | 2014-12-09 | 2015-04-08 | 上海伽利略导航有限公司 | Bit and power combined allocation method with user and data streams |
| CN104660392A (en) * | 2015-03-09 | 2015-05-27 | 重庆邮电大学 | Prediction based joint resource allocation method for cognitive OFDM (orthogonal frequency division multiplexing) network |
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| CN104066186B (en) * | 2014-06-25 | 2017-04-26 | 西安电子科技大学 | CoMP mode data transfer mode under limited capacity |
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| CN104660392A (en) * | 2015-03-09 | 2015-05-27 | 重庆邮电大学 | Prediction based joint resource allocation method for cognitive OFDM (orthogonal frequency division multiplexing) network |
| CN113676255A (en) * | 2021-08-24 | 2021-11-19 | 北京邮电大学 | Multi-band optical fiber transmission method and system based on adaptive modulation |
| CN113676255B (en) * | 2021-08-24 | 2022-08-02 | 北京邮电大学 | Multi-band optical fiber transmission method and system based on adaptive modulation |
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