CN102299885B - Adaptive bit power loading method and device - Google Patents

Abstract

The invention discloses an adaptive bit power loading method and device. The method comprises the following steps of: determining a signal-to-noise ratio switching threshold of various modulation coding combinations in an additive white Gaussian noise channel; calculating the effective signal-to-noise ratio of a group of sub-carriers according to channel response of the used sub-carriers; comparing the effective signal-to-noise ratio with the signal-to-noise ratio switching threshold, and determining the modulation mode and code rate of the used sub-carriers; and taking the determined modulation mode and code rate as those used for transmission of a next frame. The method and device provided by the invention can be used for solving the problems that the transmitted information is divided into so multiple blocks, code words are small and the coding gain is not obvious in the process of transmitting information, thereby improving the utilization rate of the channel and improving the power allocation modes and the system performance.

Description

Self-adaptive bit power loading method and equipment

The application be submitted that Patent Office of the People's Republic of China, application number are 200910050541.4 on April 30th, 2009, denomination of invention divides an application for the Chinese patent application of " self-adaptive bit power loading method and equipment ".

Technical field

The present invention relates to the communication technology, particularly relate to a kind of self-adaptive bit power loading method and equipment.

Background technology

Development along with mobile communication technology, super three generations (B3G) wireless communication system extensively adopts OFDM (OFDM, Orthorgonal Frequency Division Multiplexing) technology, frequency band is divided into the subcarrier of some, by these subcarrier parallel transmission data, greatly improved data transmission rate.Because the channel circumstance of subcarrier experience there are differences, thereby their transmittability difference, and the mode that improves systematic function mainly to be transmittability according to subcarrier load the information bit of respective numbers for it, present, comprise following dual mode:

A kind of mode is: water-filling algorithm: the principle that obtains when all subcarrier received signal to noise ratio equate according to the maximum of channel capacity, received signal to noise ratio according to subcarrier, and, if this received signal to noise ratio is greater than the threshold value of default signal to noise ratio, then distribute the power inversely proportional with this signal to noise ratio for this subcarrier, if this received signal to noise ratio does not then carry out transfer of data less than the threshold value of default signal to noise ratio.But, because communication environment is complicated and changeable, the received signal to noise ratio of subcarrier will be on a very big continuous space value, the power distribution result that causes water-filling algorithm also will be on a very big continuous space value, and then require the modulation system of system and code check combination to have near unlimited multiple possibility.To realize that at real system such algorithm cost is too high.

Another kind of mode is: the adaptive bit loading technique: according to the channel response of subcarrier, be its information bit that calculates loading by certain rule and computing formula, specifically comprise:

If gross power is P _Tol, the sub-carrier number of use is D, then the initialization power that is assigned to of each subcarrier is P _i=P _Tol/ D; H _iThe channel response of representing i subcarrier.Then the information bit of i subcarrier loading is

$R_i=\frac{R_T}{D^{\′}}+\frac{1}{D^{\′}}\ln \left(\frac{{\left({\left|H_i\right|}^2\right)}^{D^{\′}}}{{\mathrm{\Π}}_{l\∈\mathrm{\Δ}}{\left|H_l\right|}^2}\right)---\left(1\right)$

$R_i=\frac{R_T}{D^{\′}}+\frac{1}{D^{\′}}\mathrm{ld}\left(\frac{{\left({\left|H_i\right|}^2\right)}^{D^{\′}}}{{\mathrm{\Π}}_{l\∈\mathrm{\Δ}}{\left|H_l\right|}^2}\right)---\left(1\right)$

P _TThe information bit of expression object transmission, Δ=(1,2 ..., D), initial D '=D, ld represents to take from right logarithm.

All subcarrier R _iAfter calculating end, carry out R _iQuantification treatment:

$R_{\mathrm{iQ}}=\mathrm{QUANT}\left(R_i\right)=\left\{\begin{array}{cc}{R}_{\max },& R_i\&GreaterEqual;R_{\max }-0.5\\ \mathrm{int}(R+5),& 0.5\&le;R_i\&le;R_{\max }-0.5\\ 0,& R_i<0.5\end{array}\right.---\left(2\right)$

R _MaxEach subcarrier transmission information bit number of the maximum that expresses support for; Int (x) expression is not more than the integer of x.

In aforesaid way, the information bit that loads on each subcarrier is obtained by modulation system and code check.Such as, can be obtained by modulation system 16QAM and 3/4 code check.Different subcarriers may adopt different modulation systems and code check, and data with different code rates is obtained by different code word punchings.

Problems such as hence one can see that, and the processing of prior art might make the code check of employing too disperse, and causes information transmitted by too much block encoding, and code word is smaller, and coding gain is not obvious.And the coding gain of Turbo code and LDPC sign indicating number is subjected to the influence of codeword size remarkable: code word is more big, and coding gain is more high.And present adaptive bit loading technique is applied to Turbo or LDPC coded system, and systematic function is relatively poor.

Summary of the invention

The embodiment of the invention provides a kind of self-adaptive bit power loading method and equipment, the transmission block sort that causes when the transmission information is many, code word is little and the unconspicuous problem of coding gain to solve, thereby improve the utilance of channel, improve the method for salary distribution of power and the performance of system.

For solving the problems of the technologies described above, the embodiment of the invention provides a kind of self-adaptive bit power loading method, and described method comprises:

Determine the handoff threshold of various code checks under the handoff threshold of various modulation systems under the additive white Gaussian noise channel and the every kind of modulation system;

Handoff threshold according to described various modulation systems utilizes the self-adaptive bit power loading algorithm to calculate the modulation system of each subcarrier and the transmitting power that is assigned to;

The power that more described each subcarrier is assigned to and the handoff threshold of described various code checks are determined the code check that each subcarrier uses;

The code check that each subcarrier is used calculates the code check of all subcarriers by interpolation, is an identical code check;

Modulation system and code check when the modulation system of described definite each subcarrier is transmitted as next frame with the mutually same code check that calculates.

The embodiment of the invention also provides a kind of self-adaptive bit power loading method, it is characterized in that, comprising:

Determine the signal to noise ratio handoff threshold of multiple modulating-coding combination under the additive white Gaussian noise channel;

The channel response of the subcarrier that utilization is used calculates the effective signal-to-noise ratio of this group subcarrier;

More described effective signal-to-noise ratio and signal to noise ratio handoff threshold are determined modulation system and the code check of the subcarrier of described use;

Modulation system and code check when described definite modulation system and code check are transmitted as next frame.

Correspondingly, the embodiment of the invention provides a kind of self-adaptive bit power loading equipemtn, comprising:

The thresholding determining unit be used for to be determined the handoff threshold of various code checks under the handoff threshold of various modulation systems under the additive white Gaussian noise channel and the every kind of modulation system;

Computing unit is used for utilizing self-adaptive bit power to load the modulation system of calculating each subcarrier and the transmitting power that is assigned to according to the handoff threshold of described various modulation systems;

The code check determining unit, the handoff threshold of the various code checks that the transmitting power that each subcarrier that calculates for more described computing unit is assigned to and described code check determining unit are determined is determined the various code rate that each subcarrier uses;

The interpolation computing unit, the code check that each subcarrier that is used for described code check determining unit is determined uses is an identical code check by the code check that interpolation calculates all subcarriers;

Modulation system and code check when default unit, the modulation system that is used for each subcarrier that described computing unit is obtained transmit as next frame with the identical code check that the interpolation computing unit calculates.

The embodiment of the invention also provides a kind of self-adaptive bit power loading equipemtn, comprising:

The thresholding determining unit is used for the signal to noise ratio handoff threshold of determining that multiple modulating-coding makes up under the additive white Gaussian noise channel;

Computing unit, the channel response that is used for the subcarrier of utilization use calculates the effective signal-to-noise ratio of this group subcarrier;

Power determining unit is used for effective signal-to-noise ratio and the signal to noise ratio handoff threshold of described subcarrier are compared, and determines modulation system and the code check of described subcarrier;

Default unit, modulation system and code check when being used for modulation system that described power determining unit is determined and code check and transmitting as next frame.

As shown from the above technical solution, the embodiment of the invention utilizes the self-adaptive bit power loading algorithm to calculate the modulation system of each subcarrier and the power that is assigned to according to the handoff threshold of predetermined various modulation systems and the handoff threshold of various code checks, improved the method for salary distribution and the utilization ratio of power, improved the coding gain of coded system and improve systematic function.

Description of drawings

The flow chart of the self-adaptive bit power loading method that provides in the embodiment of the invention is provided Fig. 1;

Another flow chart of the self-adaptive bit power loading method that provides in the embodiment of the invention is provided Fig. 2;

The structural representation of the self-adaptive bit power loading equipemtn that provides in the embodiment of the invention is provided Fig. 3;

Another structural representation of the self-adaptive bit power loading equipemtn that provides in the embodiment of the invention is provided Fig. 4.

Embodiment

Below we by reference to the accompanying drawings, embodiments of the present invention is described in detail.

See also Fig. 1, the flow chart of the self-adaptive bit power loading method that provides in the embodiment of the invention is provided; Described method comprises:

Step 101: the handoff threshold of determining various code checks under the handoff threshold of various modulation systems under the additive white Gaussian noise channel and the every kind of modulation system;

Step 102: the handoff threshold according to described various modulation systems utilizes the self-adaptive bit power loading algorithm to calculate the modulation system of each subcarrier and the transmitting power that is assigned to;

Step 103: the transmitting power that more described each subcarrier is assigned to and the handoff threshold of described various code checks, determine the code check that each subcarrier uses;

Step 104: the code check that each subcarrier is used is an identical code check by the code check that interpolation calculates all subcarriers;

Step 105: modulation system and code check when the modulation system of described definite each subcarrier is transmitted as next frame with an identical code check that calculates.

The embodiment of the invention can or satisfy the principle of maximum spectral efficiency under certain performance requirement prerequisite by maximum spectral efficiency, determine the handoff threshold of various modulation systems under additive white Gaussian noise (AWGN, the Additive White Gaussian Noise) channel

Use same principle again, determine the handoff threshold of various code checks under every kind of modulation system

Wherein, the described handoff threshold of determining various modulation systems

Handoff threshold with various code checks Be known technology for those skilled in the art, do not repeated them here.

For convenience of description, suppose that the sub-carrier number that uses is N, available horsepower is P _T, the detailed process of described self-adaptive bit power loading method is:

1) power P of each subcarrier of initialization _n(1≤n≤N), described initialized method can but be not limited to water-filling algorithm;

2) with initialization power P _nWith the channel response multiplied result of corresponding subcarrier, with the handoff threshold of modulation system

Compare, select P _nBe not more than

The modulation system β of corresponding high-order _nModulation system as this subcarrier;

3) calculate subcarrier n for supporting this kind modulation system desired power P _Req, computational methods can but be not limited to water-filling algorithm.Afterwards, recording the remaining available horsepower of described system is P _Ava, i.e. P _Ava=P _T-P _Req

4) antithetical phrase carrier wave n is calculated as modulation system β _nAfter being elevated to next contrast mode processed, the power P of required increase _Inc(n); After calculating the power that all subcarrier N need increase, from all subcarrier N, select the minimum subcarrier of power of required increase, its modulation system is elevated to next contrast mode processed, and upgrades the transmitting power that this subcarrier is assigned to; If this moment, the available horsepower of system still had residue, then continue said process step 4, until the available horsepower of system residue not; Otherwise, finish this process.

5) power P that each subcarrier is assigned to _nHandoff threshold with various code checks under predetermined every kind of modulation system

Compare, select P _nBe not more than The highest corresponding code check γ _nEmployed code check as this subcarrier; Thereby obtain the code check that each subcarrier uses;

6) code check that each subcarrier is used calculates by interpolation formula, and the code check that obtains all subcarriers is an identical code check, and wherein, described interpolation formula can be but be not limited to the linear interpolation that numerical value is handled;

7) with the modulation system of described definite each subcarrier and an identical code check that calculates as modulation system and the code check of user when next frame transmits.

Hence one can see that, and the embodiment of the invention is undertaken after initial power distributes by water-filling algorithm, available horsepower that may surplus is reallocated by certain rule and changes the modulation system of respective resources; And to modulation system and code check that each subcarrier (being resource) of being determined by the channel quality information of predefined modulation system code check handoff threshold and resource adopts, carry out aftertreatment, guarantee that the code check of subcarrier of all uses is identical.With the method for salary distribution and the utilization ratio of improving power, improve throughput of system.Simultaneously, revised self-adaptive bit power loading method block encoding number of times is few, and code word is bigger, is of value to the coding gain that improves Turbo or LDPC coded system, thereby improves the performance of system.

For the ease of those skilled in the art's understanding, see also following specific embodiment.Need to prove that the embodiment of the invention is that example illustrates with the handoff threshold of various modulation systems and code check under the awgn channel, but is not limited to this.

Embodiment 1:

At first, determine the signal to noise ratio handoff threshold between the various modulation systems under the awgn channel

M represents modulation system, such as m ∈ M=(1,2,4,6), represent biphase phase shift keying (BPSK, Binary Phase Shift Keying), quaternary PSK (QPSK respectively, Quadrature Phase-Shift Keying), 16 quadrature amplitude modulations (16QAM, Quadrature Amplitude Modulation) and 64QAM.This is example, and the value of m is not limited thereto;

Wherein, Really fixing can be maximize throughput then, as does not have the data transmission service of Packet Error Ratio restriction; Also can be to satisfy maximize throughput under certain mistake restriction prerequisite, as voice service, the restriction of described mistake can bit error rate (BER, Bit Error Rate), Block Error Rate (B LER, Block Error Rate) or frame error rate (FER, Frame Error Rate) etc.

Secondly, after determining modulation system, determine the signal to noise ratio handoff threshold of various code checks again

Wherein, m represents modulation system, and R represents code check,

Really fix then together

Really fix then, do not repeat them here.

Again, the described self-adaptive bit power that utilizes loads the modulation system of determining each subcarrier and the power that is assigned to, namely utilize water-filling algorithm to carry out the distribution of power at the beginning earlier, the power utilization self application bit loading of possibility surplus is reallocated, obtain the modulation system of each subcarrier and the power of distribution.Its concrete process comprises:

Suppose that the subcarrier that uses or the quantity of Resource Block are n, n=1...N (N represent use subcarrier or Resource Block quantity).

(1), initializing set p _nA class value, iterations IterNum1=0 at the beginning, available power is the power that gross power deducts the original allocation of N subcarrier or Resource Block, obtains total available power, its computing formula is:

Pavail1＝Ptol-N*pn，，Pno＝0，β＝{0}；

Wherein, β represents available order of modulation rally, is initially 0; Pno is a flag bit, and whether expression also has available horsepower, 0,1 respectively expression have, no available horsepower, p _nThe original allocation power of representing n subcarrier (or Resource Block), the criterion of original allocation power can be water-filling algorithm, but be not limited to this, the principle of described water-filling algorithm is: the principle that obtains when all subcarrier received signal to noise ratio equate according to the maximum of channel capacity, received signal to noise ratio γ according to subcarrier, for it distributes the power inversely proportional with γ, its formula is:

$\frac{P\left(\mathrm{\&gamma;}\right)}{P_{\mathrm{tot}}}=\left\{\begin{array}{cc}\frac{1}{{\mathrm{\&gamma;}}_0}-\frac{1}{\mathrm{\&gamma;}},& \mathrm{\&gamma;}\&GreaterEqual;{\mathrm{\&gamma;}}_0\\ 0,& \mathrm{\&gamma;}<{\mathrm{\&gamma;}}_0\end{array}\right.$

γ ₀Be a threshold value, the expression received signal to noise ratio be lower than this moment do not carry out transfer of data, Ptot is gross power.Its concrete implementation procedure is known technology for those skilled in the art, also gives unnecessary details at this again.

(2), judge that the transmitting power of distributing at the beginning of channel response of each subcarrier (or Resource Block) is whether greater than the signal to noise ratio handoff threshold of modulation system

(namely

), if greater than, it is b that modulation system then is set _n=max (β), β=β ∪ { m};

Wherein, Hn represents the channel response of n subcarrier (or Resource Block), and bn represents modulation system,

(3), calculate

The through-put power p of Shi Suoxu _Req, the transmitting power pn of original allocation is upgraded p _Req, and the calculating available power is the p after original power deducts renewal _n, i.e. pn=p _Req, Pavail=Pavail-pn, wherein, n=1...N, (N represent use subcarrier or Resource Block quantity);

(4), in the process of computes transmit power, when modulation system rises to b from bn _n, satisfy

The through-put power of required increase is pincrt (n); And iterations adds 1, i.e. IterNum=IterNum+l;

(5), be index with pincrt (n), find out the modulation system of consumes least through-put power, namely

I represents to improve the indicated subcarrier of modulation system consumes least through-put power; And described through-put power and available power compared:

If p _Incrt(n)＜P _Avail; B then _i=b ' _i, P _Avail=P _Avail-p _Incrt(n), p _i=p _i+ p _Incrt(i),

If p _Incrt(n)＞P _Avail; P then _No=1;

(6), judge that whether iterations is more than or equal to default maximum iteration time, (be IterNum＞=MaxIter, MaxIter is default maximum iteration time) if, then iteration finishes, otherwise continue execution in step (4) and step (5), until iterations more than or equal to the maximum iteration time of presetting.In addition, also can whether equal 1 according to Pno and judge whether iteration finishes, if Pno=1, then iteration finishes; Otherwise continue step (4) and (5).

(7), when iteration finishes, just can obtain the modulation system bn of each subcarrier and the power pn that is assigned to.

Again, the power that more described each subcarrier is assigned to and the handoff threshold of described various code checks, determine the code check that each subcarrier uses, the code check that each subcarrier is used is an identical code check by the code check that interpolation calculates all subcarriers, in this step, n=1...N, (N represent use subcarrier or Resource Block quantity) specifically comprises:

(1) transmitting power that is assigned to of more described each subcarrier and the handoff threshold of described various code checks select to be not more than the power of the described subcarrier of described handoff threshold, and this computational process can be passed through following formula:

$R=\arg \underset{R}{\max }\{{\mathrm{\&gamma;}}_{m,R}^2\&GreaterEqual;p_n{H}_n\},$ Initialization

Equal the R that first calculates;

(2) if

R then _n=R (R _nRepresent the code check that n subcarrier or Resource Block adopt); Otherwise

$R_n=\frac{(R^{\&prime;}-R)p_n{H}_n+{\mathrm{\&gamma;}}_{m,R^{\&prime;}}^{2}R-{\mathrm{\&gamma;}}_{m,R}^2{R}^{\&prime;}}{{\mathrm{\&gamma;}}_{m,R^{\&prime;}}^2-{\mathrm{\&gamma;}}_{m,R}^2},$ The higher code check of R ' expression next-door neighbour R;

(3) $\hat{R}=\underset{R\&Element;\mathrm{\&phi;}}{\max }\{R\&le;\frac{{\mathrm{\&Sigma;}}_n{b}_n{R}_n}{{\mathrm{\&Sigma;}}_n{b}_n}\},$ The express possibility set of the code check that uses of φ.

Until obtaining

Be the code check of employed subcarrier in next frame transmission use.

At last, with the modulation system of described definite subcarrier and code check as modulation system and the code check of user when next frame transmits.

In the embodiment of the invention, preestablish the signal to noise ratio handoff threshold between the various modulation systems of channel, and the signal to noise ratio handoff threshold of various code checks; Utilize water-filling algorithm and self-adaptive bit power loading algorithm according to the signal to noise ratio handoff threshold of the modulation system of original setting and the signal to noise ratio handoff threshold of code check, obtain the modulation system of each Resource Block and the transmitting power that is assigned to, that is to say, utilize water-filling algorithm to carry out after initial power distributes earlier, power recycling self-adaptive bit power loading algorithm that may surplus is reallocated and change modulation system and the code check of respective resources piece; Calculate identical code check for a plurality of Resource Block interpolations, guarantee that namely the employed code check of Resource Block of all uses is identical.Thereby solved the adaptive bit loading algorithm is applied to Turbo or LDPC coded system, the transmission block sort that causes is many, code word is little, the not obvious problem of coding gain.

Embodiment 2:

Present embodiment 2 is identical with the implementation procedure part of embodiment 1, and its identical part sees above-described embodiment 1 for details, and as different from Example 1, in the self-adaptive bit power load step, adopts and give employed resource with the available horsepower mean allocation.As, available horsepower is P _Tol, the resource quantity of use is N, then the power that is assigned to of each resource units is P _Tol/ N.Its concrete process is:

The power of each subcarrier of initialization; With the channel response multiplied result of described initialized power with corresponding subcarrier, compare with the handoff threshold of the modulation system of this subcarrier; From result relatively, select described multiplied result to be not more than the modulation system of the corresponding high-order of the handoff threshold of described modulation system as the modulation system of this subcarrier; Be calculated as the needed through-put power of modulation system of supporting described subcarrier, and the remaining available horsepower of register system; Give all subcarriers with described remaining available horsepower mean allocation.

This shows, adopt as embodiment 2 described methods, can shortcut calculation, reduce implementation complexity, the performance of improvement system.

Embodiment 3:

The embodiment of the invention also provides a kind of self-adaptive bit power loading method, its flow chart as shown in Figure 2, described method comprises:

Step 201: the signal to noise ratio handoff threshold of determining multiple modulating-coding combination under the additive white Gaussian noise channel;

The embodiment of the invention pre-determines the signal to noise ratio handoff threshold γ of multiple modulating-coding combination under the awgn channel _{M, R}, m represents modulation system, R represents code check.Its described definite signal to noise ratio handoff threshold γ _{M, R}Criterion identical with the criterion of handoff threshold among the embodiment 1, specifically see for details above-mentionedly, do not repeat them here.

Step 202: the channel response of the subcarrier that utilization is used calculates the effective signal-to-noise ratio (ECINR) of this group subcarrier, wherein, and the effective signal-to-noise ratio γ of the subcarrier that uses under the instant channel _EffExpression; Wherein, calculate γ _EffCan effectively believe dry than mapping (EESM by index, Exponential Effective SINR Mapping), mutual information is effectively believed dry than mapping (MIESM, Mutual Information Effective SINR Mapping) or instant capacity effectively believe dry than mapping (ICESM, Intananeous Capacity Effective SINR Mapping) formula obtains, but is not limited to this.

Step 203: more described effective signal-to-noise ratio and signal to noise ratio handoff threshold, determine modulation system and the code check of the subcarrier of described use;

Wherein, the modulation system of the subcarrier of described definite use and code check specifically comprise:

The effective signal-to-noise ratio of the subcarrier of more described use and signal to noise ratio handoff threshold, select the signal to noise ratio handoff threshold near effective signal-to-noise ratio, and modulation system and code check that the corresponding modulation system of described signal to noise ratio handoff threshold and code check are used as this subcarrier.Namely utilize formula:

$(m,R)=\arg \underset{m,R}{\max }\{{\mathrm{\&gamma;}}_{\mathrm{eff}}\&GreaterEqual;{\mathrm{\&gamma;}}_{m,R}\}$

Determine modulation system and the code check of the subcarrier of described use.

Step 204: with described definite modulation system and code check as modulation system and the code check of user when next frame transmits.

Wherein, the mode of the effective signal-to-noise ratio of the subcarrier of described use comprises: index is effectively believed dry than mapping EESM, or mutual information effectively believes dryly than mapping MIESM, or instant capacity is effectively believed dry than mapping ICESM.

The method of salary distribution and the utilization ratio of present embodiment by improving power, the throughput of raising system, revised self-adaptive bit power loading method is of value to the coding gain that improves Turbo or LDPC coded system, improves the performance of system.

Should be appreciated that the software of realizing self-adaptive bit power loading method of the present invention can be stored in the computer-readable medium.This software when carrying out, comprise Overall Steps or part steps in the said method, described computer-readable recording medium is as ROM/RAM, magnetic disc, CD etc.

In addition, the embodiment of the invention also provides a kind of self-adaptive bit power loading equipemtn, its structural representation as shown in Figure 3, described equipment comprises: thresholding determining unit 31, computing unit 32, code check determining unit 33, interpolation computing unit 34 and default unit 35, wherein

Described thresholding determining unit 31 be used for to be determined the handoff threshold of various code checks under the handoff threshold of various modulation systems under the additive white Gaussian noise channel and the every kind of modulation system; Described computing unit 32, the handoff threshold that is used for the various modulation systems determined according to described thresholding determining unit 31 utilizes self-adaptive bit power to load the modulation system of calculating each subcarrier and the transmitting power that is assigned to; Described code check determining unit 33, the handoff threshold of the various code checks that the transmitting power that each subcarrier that calculates for more described computing unit 32 is assigned to and described code check determining unit 33 are determined is determined the code check that each subcarrier uses; Described interpolation computing unit 34, the code check that is used for each subcarrier that described code check determining unit 33 is determined is used is an identical code check by the code check that interpolation calculates all subcarriers; Described default unit 35 is used for the modulation system of each subcarrier that described computing unit 32 is obtained and an identical code check that interpolation computing unit 34 calculates as modulation system and the code check of subcarrier when next frame transmits.

A kind of execution mode, described computing unit comprises: initialization unit, first selected cell, first computing unit, second computing unit, second selected cell and judging unit, wherein, described initialization unit is for the power of each subcarrier of initialization; Described first selected cell, be used for the channel response multiplied result of described initialized power with corresponding subcarrier, compare with the handoff threshold of the modulation system of this subcarrier, the modulation system of the corresponding high-order of the handoff threshold of selecting described initialized power to be not more than described modulation system from result relatively is as the modulation system of subcarrier; Described first computing unit is used for being calculated as the needed through-put power of modulation system of supporting described subcarrier, and the remaining available horsepower of register system; Described second computing unit, the modulation system that is used for the described subcarrier of calculating is elevated to the through-put power of the required increase of next contrast mode processed; Described second selected cell is used for the minimum subcarrier of through-put power that selection needs increase, its modulation system is elevated to next contrast mode processed, and upgrades the transmitting power that this subcarrier is assigned to; Described judging unit is used for judging whether described system also has remaining available horsepower, if having, then notifies second computing unit.

Another kind of by way of example, described computing unit 32 comprises: initialization unit, first selected cell, first computing unit and power distributing unit, wherein, described initialization unit is for the power of each subcarrier of initialization; Described first selected cell, be used for the channel response multiplied result of described initialized power with corresponding subcarrier, compare with the handoff threshold of the modulation system of this subcarrier, the modulation system of the corresponding high-order of the handoff threshold of selecting described initialized power to be not more than described modulation system from result relatively is as the modulation system of this subcarrier; Described first computing unit is used for being calculated as the needed through-put power of modulation system of supporting described subcarrier, and records the remaining available horsepower of described system; Described power distributing unit is used for giving all subcarriers with described remaining available horsepower mean allocation.

Described code check determining unit comprises: comparing unit and selected cell, wherein, described comparing unit, the transmitting power that is used for described each subcarrier is assigned to compares with the channel response multiplied result of corresponding subcarrier and the handoff threshold of described various code checks, and transmission is near the described handoff threshold of described multiplied result; Described selected cell is used for after receiving the described handoff threshold that comparing unit sends, with the corresponding code check of described handoff threshold as the employed code check of this subcarrier.

The embodiment of the invention also provides a kind of self-adaptive bit power loading equipemtn, its structural representation is shown in Figure 4, described equipment comprises: thresholding determining unit 41, computing unit 42, power determining unit 43 and default unit 44, wherein, described thresholding determining unit 41 is used for the signal to noise ratio handoff threshold of determining that multiple modulating-coding makes up under the additive white Gaussian noise channel; Described computing unit 42, the channel response that is used for the subcarrier of utilization use calculates the effective signal-to-noise ratio of this group subcarrier; Described power determining unit 43 is used for effective signal-to-noise ratio and the signal to noise ratio handoff threshold of described subcarrier are compared, and determines modulation system and the code check of described subcarrier; Described default unit 44 is used for the modulation system that described power determining unit is definite and code check as modulation system and the code check of user when next frame transmits.

Described power determining unit comprises: comparing unit and selected cell, wherein, described comparing unit, comparing unit, be used for effective signal-to-noise ratio and the signal to noise ratio handoff threshold of the subcarrier of described use are compared, and transmission is near the signal to noise ratio handoff threshold of effective signal-to-noise ratio; Described selected cell is used for after receiving the described signal to noise ratio handoff threshold that comparing unit sends, modulation system and code check that the corresponding modulation system of described signal to noise ratio handoff threshold and code check are used as this subcarrier.。

Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product can be stored in the storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.

The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (3)

1. a self-adaptive bit power loading method is characterized in that, comprising:

Determine the signal to noise ratio handoff threshold of multiple modulating-coding combination under the additive white Gaussian noise channel;

The channel response of the subcarrier that utilization is used calculates the effective signal-to-noise ratio of this group subcarrier;

More described effective signal-to-noise ratio and signal to noise ratio handoff threshold are determined modulation system and the code check of the subcarrier of described use;

The modulation system and the code check that use when described definite modulation system and code check are transmitted as next frame;

Modulation system and the code check of the subcarrier of described definite use specifically comprise:

The relatively effective signal-to-noise ratio of the subcarrier of Shi Yonging and signal to noise ratio handoff threshold, selection is not less than the signal to noise ratio handoff threshold of effective signal-to-noise ratio, and modulation system and code check that the corresponding modulation system of described signal to noise ratio handoff threshold and code check are used as this subcarrier.

2. method according to claim 1 is characterized in that, the computational methods of the effective signal-to-noise ratio of the subcarrier of described use comprise:

Index is effectively believed dry than mapping EESM, or mutual information effectively believes dryly than mapping MIESM, or instant capacity is effectively believed dry than mapping ICESM.

3. a self-adaptive bit power loading equipemtn is characterized in that, comprising:

The thresholding determining unit is used for the signal to noise ratio handoff threshold of determining that multiple modulating-coding makes up under the additive white Gaussian noise channel;

Computing unit, the channel response that is used for the subcarrier of utilization use calculates the effective signal-to-noise ratio of this group subcarrier;

Power determining unit is used for effective signal-to-noise ratio and the signal to noise ratio handoff threshold of described subcarrier are compared, and determines modulation system and the code check of described subcarrier;

Default unit, modulation system and code check when being used for modulation system that described power determining unit is determined and code check and transmitting as next frame;

Described power determining unit comprises:

Comparing unit be used for effective signal-to-noise ratio and the signal to noise ratio handoff threshold of the subcarrier of described use are compared, and transmission is not less than the signal to noise ratio handoff threshold of effective signal-to-noise ratio;

Selected cell is used for after receiving the described signal to noise ratio handoff threshold that comparing unit sends, modulation system and code check that the corresponding modulation system of described signal to noise ratio handoff threshold and code check are used as this subcarrier.

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