CN102439929B - Modulating method and modulating equipment for OFDM signal - Google Patents

Abstract

A modulating method and modulating equipment for Orthogonal Frequency Division Multiplexing (OFDM) signal are provided by the embodiments of the invention in the wireless communication filed. The method includes: receiving the current OFDM signal and the previous OFDM signal or the adjusted previous signal; generating a noise signal according to the received signal; superposing the noise signal to the current OFDM signal and generating an adjusted current OFDM signal; wherein the cyclic prefix of the adjusted current OFDM signal and the end of the previous OFDM signal or the end of the adjusted previous OFDM signal are continuous.

Description

The modulator approach of ofdm signal and modulating device

Technical field

Embodiments of the invention relate to wireless communication field, relate in particular to modulator approach and the modulating device of ofdm signal.

Background technology

Along with developing rapidly of the growth of user to various real-time multimedia traffic demands and Internet technology, the rate of information throughput of radio communication is proposed to more and more higher requirement.In order to support the higher rate of information throughput and the user moving speed of Geng Gao, in Next-Generation Wireless Communication Systems, must adopt the Radio Transmission Technology that spectrum efficiency is higher, anti-multipath interference performance is stronger.

In the wireless solution of current various high rate data transmission, the multi-carrier modulation technology that is representative with OFDM (Orthogonal Frequency Division Multiplexing, OFDM) becomes one of current technology of greatest concern.Multi-carrier modulation technology adopts such carrier modulation mode conventionally: data flow is decomposed into the relatively low sub data flow of several speed, adopt the low rate multimode signal that in these sub data flows, low bit rate forms to modulate corresponding subcarrier, thereby form the parallel transmission system sending of multiple low-rate signals.

OFDM has following advantage: the inter-signal interference that can effectively cause anti-multipath; Can effectively resist arrowband disturbs; Changing on relatively slow channel, ofdm system can recently be optimized and be distributed in the information bit transmitting on each subcarrier according to the noise of each subcarrier, improves the available capacity of system transmission information; Can adopt fast fourier transform (FFT) and contrary fast fourier transform (IFFT) to realize modulation and demodulation, the complexity of realization is lower.

The inter-signal interference (Inter-Symbol Interference, ISI) causing in order to resist multipath effect, OFDM technology adopts the way of inserting a segment protect interval (GI) before each ofdm signal.During concrete system realizes, conventionally fill Cyclic Prefix (Cyclic Prefix, CP) in protection interval, this mode is called CP-OFDM.CP-OFDM technology can overcome ISI and inter-carrier interference (Inter-carrier Interference, ICI) simultaneously.At present, existing ofdm system and standard are to be substantially all based upon on the basis of CP-OFDM technology.

The attenuation outside a channel speed that the weak point that ofdm signal exists is power spectrum is fast not, can cause the interference to nearby frequency bands data.Conventionally adopt at present the schemes such as time-domain windowed, carry out out-of-band power inhibition, but easily reduce the anti-ISI of CP-OFDM system and the ability of ICI.

Summary of the invention

Embodiments of the invention provide a kind of modulator approach and modulating device of ofdm signal, can improve the attenuation outside a channel speed of power spectrum, strengthen the anti-ISI of OFDM and the ability of ICI.

Embodiments of the invention adopt following technical scheme:

Embodiments of the invention provide a kind of modulator approach of ofdm signal, comprising:

Receive the upper ofdm signal after current ofdm signal and a upper ofdm signal or adjustment;

According to the signal generted noise signal of described reception;

Described noise signal is superimposed upon on described current ofdm signal, generates the current ofdm signal after adjusting, the afterbody of the upper ofdm signal after the CP of the current ofdm signal after described adjustment and a described upper ofdm signal or adjustment is continuous.

Embodiments of the invention provide the modulator approach of another kind of ofdm signal, comprising:

Obtain added CP current ofdm signal, added a upper ofdm signal of CP and a upper ofdm signal of first noise signal that superposeed;

According to having added the described current ofdm signal of CP and a upper ofdm signal of described first noise signal that superposeed, generate the second noise signal of an ofdm signal; Described the second noise signal is superimposed upon on a upper ofdm signal of described first noise signal that superposeed, generates the upper OFDM after adjusting;

According to the described current ofdm signal and the described upper ofdm signal that has added CP that have added CP, generate the first noise signal of current ofdm signal, and described the first noise signal is superimposed upon on described current ofdm signal, the superposeed current ofdm signal of the first noise signal of generation, the afterbody of the upper ofdm signal after CP and the described adjustment of the current ofdm signal of described first noise that superposeed is continuous.

Embodiments of the invention provide a kind of modulating device of ofdm signal, comprising:

Receiving element, for receiving the upper ofdm signal after current ofdm signal and a upper ofdm signal or adjustment;

Noise generation unit, for according to the signal generted noise signal of described reception;

Signal generation unit, for described noise signal is superimposed upon to described current ofdm signal, generate the current ofdm signal after adjusting, the afterbody of the upper ofdm signal after the CP of the current ofdm signal after described adjustment and a described upper ofdm signal or adjustment is continuous.

Embodiments of the invention provide the modulating device of another kind of ofdm signal, comprising:

Acquiring unit, added for obtaining CP current ofdm signal, added a upper ofdm signal of CP and a upper ofdm signal of first noise signal that superposeed;

Noise generation unit, for according to having added the described current ofdm signal of CP and a upper ofdm signal of described first noise signal that superposeed, generates the second noise signal of an ofdm signal; Described the second noise signal is superimposed upon on a upper ofdm signal of described first noise signal that superposeed, generates the upper OFDM after adjusting;

Signal generation unit, be used for according to the described current ofdm signal and the described upper ofdm signal that has added CP that have added CP, generate the first noise signal of current ofdm signal, and described the first noise signal is superimposed upon on described current ofdm signal, the superposeed current ofdm signal of the first noise signal of generation, the afterbody of the upper ofdm signal after CP and the described adjustment of the current ofdm signal of described first noise that superposeed is continuous.

The modulator approach of the ofdm signal that embodiments of the invention provide and modulating device, by superimposed noise signal on current ofdm signal, make the CP of current ofdm signal and the afterbody of a upper ofdm signal after adjusting continuous, or the CP of current ofdm signal after making to adjust with adjust after the afterbody of a upper ofdm signal continuous, front several sampling points of the CP of the current ofdm signal after adjusting like this also can be regarded the cyclic suffix of an ofdm modulation signal as, realized between ofdm signal continuously, effectively suppress band outward leakage, the anti-ISI of OFDM and the ability of ICI are strengthened.

Brief description of the drawings

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the schematic flow sheet of embodiments of the invention one;

Fig. 2 is the schematic flow sheet of embodiments of the invention two;

Fig. 3 is the schematic diagram of ofdm signal in embodiments of the invention two;

Fig. 4 is the schematic diagram of the another kind of ofdm signal of embodiments of the invention;

Fig. 5 is the schematic flow sheet of embodiments of the invention three;

Fig. 6 is the schematic flow sheet of embodiments of the invention four;

Fig. 7 is the schematic flow sheet of embodiments of the invention five;

Fig. 8 is the schematic flow sheet of embodiments of the invention six;

Fig. 9 is the schematic flow sheet of embodiments of the invention seven;

Figure 10 is the schematic diagram of the modulating device of embodiments of the invention OFDM;

Figure 11 is the schematic diagram of embodiments of the invention noise generation unit;

Figure 12 is the schematic diagram of the modulating device of another embodiment of the present invention OFDM;

Figure 13 is the schematic diagram of another embodiment of the present invention noise generation unit.

Embodiment

Modulator approach and modulating device below in conjunction with accompanying drawing to a kind of ofdm signal of the embodiment of the present invention are described in detail.

Should be clear and definite, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, all other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, belong to the scope of protection of the invention.Following embodiment is possibility of the present invention, and putting in order of following examples do not represent priority.

Embodiment mono-

As shown in Figure 1, embodiments of the invention provide a kind of modulator approach of ofdm signal, comprising:

S101, receive current ofdm signal and adjust after a upper ofdm signal;

In this application, the upper ofdm signal of noise signal that referred to superpose of the upper ofdm signal after adjustment.

S102, according to the signal generted noise signal of described reception;

S103, described noise signal is superimposed upon on described current ofdm signal, generates the current ofdm signal after adjusting, the afterbody of the upper ofdm signal after the CP of the current ofdm signal after described adjustment and described adjustment is continuous.

The modulator approach of the ofdm signal that embodiments of the invention provide, by superimposed noise signal on ofdm signal, make adjust after current ofdm signal CP with adjust after a upper ofdm signal continuous, realized between ofdm signal continuously, effectively suppress band outward leakage, strengthened the anti-ISI of OFDM and the ability of ICI.

Embodiment bis-

As shown in Figure 2, the present embodiment can comprise the steps:

I-1 ofdm signal after S201, i ofdm signal of reception and adjustment.

I ofdm signal is called to S ⁱ, i ofdm signal after adjustment is called

i-1 ofdm signal after adjustment is called

can from buffer memory, extract.

That is, often obtaining after the ofdm signal of the noise signal that superposeed, will carry out buffer memory, with reference to step S206.The ofdm signal of the noise signal that superposeed can be thought the ofdm signal after adjustment.

S202, obtain the class pulse Kernel signal corresponding with described i ofdm signal.

Particularly, the generation method of Kernel signal is as follows:

First each carrier wave that is ofdm signal is set a suitable weighted value w _k, must meet w _k>=0, and be nonnegative real number, then carry out IFFT conversion and obtain Kernel signal.The normalized Kernel signal of high-amplitude for M times of speed over-sampling is:

p＝(p ₀ p ₁…p _MK-1) (1)

Wherein

$p_l=\underset{k=0}{\overset{\mathrm{MK}-1}{\mathrm{\Σ}}}{w}_k{e}^{j\frac{2\mathrm{\πkl}}{\mathrm{MK}}}/\underset{k=0}{\overset{\mathrm{MK}-1}{\mathrm{\Σ}}}{w}_k---\left(2\right)$

Wherein, K is the sampling point number that the ofdm signal of one times of speed is corresponding, and l is the index value of the corresponding time domain sampling point of ofdm signal, is integer, and 0≤l≤MK-1, and k is the index value of each carrier wave on the corresponding frequency domain of ofdm signal, is integer, and 0≤k≤MK-1.

Ask p according to formula (2) _lamplitude can obtain:

$\left|p_l\right|=\left|\underset{k=0}{\overset{\mathrm{MK}-1}{\mathrm{\Σ}}}{w}_k{e}^{j\frac{2\mathrm{\πkl}}{\mathrm{MK}}}\right|/\underset{k=0}{\overset{\mathrm{MK}-1}{\mathrm{\Σ}}}{w}_k$

$\≤\underset{k=0}{\overset{\mathrm{MK}-1}{\mathrm{\Σ}}}\left|w_k{e}^{j\frac{2\mathrm{\πkl}}{\mathrm{MK}}}\right|/\underset{k=0}{\overset{\mathrm{MK}-1}{\mathrm{\Σ}}}{w}_k$

$=1,$

In above formula, the condition that equal sign is set up is each element cophase stacking of summation, is also that k is while getting different value

all homophases.Certainly exist two continuous element w that are greater than 0 for weight vector _k-1and w _k, in order to ensure

with

homophase, requirement $\frac{w_k{e}^{j\frac{2\mathrm{\πkl}}{\mathrm{MK}}}}{w_{k-1}{e}^{j\frac{2\mathrm{\π}(k-1)l}{\mathrm{MK}}}}=\frac{w_k}{w_{k-1}}{e}^{j\frac{2\mathrm{\πl}}{\mathrm{MK}}}$ For positive real number, thereby set up while only having l=0.

Also be p ₀=1 is the high-amplitude point of Kernel signal, and other amplitude is all less than 1.

The process that generates Kernel signal can be carried out online, for example, after producing by computer, stores, and directly extracts when needed.

While generating Kernel signal, can the distribution of flexible control noise on each subcarrier be set by different weights.For example, if weight is only set in specific subcarrier, it is 0 that other subcarrier arranges weight, and the noise that embodiments of the invention are introduced only drops on these specific subcarriers; Larger weighted value also can be set on the strong subcarrier of antijamming capability, a less weighted value is set on antijamming capability subcarrier almost, on subcarrier important or that can not disturb, weighted value can be set is 0, embodiments of the invention just can disposablely be introduced larger noise on the strong subcarrier of antijamming capability, on the poor subcarrier of antijamming capability, introduce less noise, on subcarrier important or that can not disturb, do not introduce noise.

If N is a positive integer, the present embodiment will ensure that the top n sampling point of CP after current ofdm signal superimposed noise signal is identical with the top n sampling point of a upper ofdm modulation signal.The Kernel signal of complete M times over-sampling is all the pattern of MK sampling point shown in formula (1), each section of the Kernel signal of N different cyclic shifts that what the N*N dot matrix in the present embodiment represented is p out ₀the matrix that near N sampling point forms.

$\left[\begin{array}{cccc}{p}_0& p_{\mathrm{MK}-1}& ...& p_{\mathrm{MK}-N+1}\\ p_1& p_0& ...& p_{\mathrm{MK}-N+2}\\ .& .& & .\\ .& .& ...& .\\ .& .& & .\\ p_{N-1}& p_{N-2}& ...& p_0\end{array}\right]$

Wherein, each row all represents that (N is less than CP length T g) to N the sampling point of MK-Tg+N for the MK-Tg+1 in MK sampling point of amounting to of Kernel signal of different cyclic shifts.

Use p _τrepresent that Kernel signal p has carried out the cyclic shift of τ, i.e. p _τ=(p _mK-τp _mK-τ+1p _mK-1p ₀p ₁p _mK-τ-1).Kernel signal phasor after the cyclic shift that in N*N dot matrix, first row is corresponding can be expressed as $p_{{\mathrm{MK}-T}_g}=\left(\begin{array}{cccccccc}{p}_{T_g}& p_{T_g+1}& ...& p_{\mathrm{MK}-1}& p_0& p_1& ...& p_{T_g-1}\end{array}\right)$ This vector has MK element, and wherein MK-Tg+1 is [p to N the sampling point of MK-Tg+N ₀p ₁p _n-1], be also the first row element of above-mentioned N*N matrix.In like manner, in N*N dot matrix, secondary series element is $p_{{\mathrm{MK}-T}_g+1}=\left(\begin{array}{cccccccc}{p}_{T_g+1}& p_{T_g+2}& ...& p_{\mathrm{MK}-1}& p_0& p_1& ...& p_{T_g}\end{array}\right)$ In MK-Tg+1 to N the sampling point of MK-Tg+N, be also [p _mK-1p ₀p ₁p _n-2].In like manner can recursion to N column element.

S203, according to described i ofdm signal with adjust after i-1 ofdm signal, the Kernel signal that obtains N different cyclic shifts corresponding amplitude-phase adjustment coefficient respectively.

In the time of i=0,

also be that first time domain OFDM signal needn't be adjusted.In the time of i>=1, need to meet signal adds after CP, i-1 the ofdm signal of the top n sampling point of CP just and after adjusting

cyclic suffix equate, or also can say with top n sampling point equate, also:

$\left[\begin{array}{c}{\tilde{s}}_{{\mathrm{MK}-T}_g}^i\\ {\tilde{s}}_{\mathrm{MK}-T_g+1}^i\\ .\\ .\\ .\\ {\tilde{s}}_{{\mathrm{MK}-T}_g+N-1}^i\end{array}\right]=\left[\begin{array}{c}{s}_{\mathrm{MK}-T_g}^i\\ s_{\mathrm{MK}-T_g+1}^i\\ .\\ .\\ .\\ s_{\mathrm{MK}-T_g+N-1}^i\end{array}\right]+\left[\begin{array}{cccc}{p}_0& p_{\mathrm{MK}-1}& ...& p_{\mathrm{MK}-N+1}\\ p_1& p_0& ...& p_{\mathrm{MK}-N+2}\\ .& .& & .\\ .& .& ...& .\\ .& .& & .\\ p_{N-1}& p_{N-2}& ...& p_0\end{array}\right]\·\left[\begin{array}{c}{c}_0^i\\ c_1^i\\ .\\ .\\ .\\ c_{N-1}^i\end{array}\right]=\left[\begin{array}{c}{\tilde{s}}_0^{i-1}\\ {\tilde{s}}_1^{i-1}\\ .\\ .\\ .\\ {\tilde{s}}_{N-1}^{i-1}\end{array}\right]---\left(3\right),$

Wherein, T _gbe the CP length of i ofdm signal.Can from formula (3), push away to such an extent that amplitude-phase corresponding to each Kernel signal of i ofdm signal adjusted coefficient

arrive

$\left[\begin{array}{c}{c}_0^i\\ c_1^i\\ .\\ .\\ .\\ c_{N-1}^i\end{array}\right]={\left[\begin{array}{cccc}{p}_0& p_{\mathrm{MK}-1}& ...& p_{\mathrm{MK}-N+1}\\ p_1& p_0& ...& p_{\mathrm{MK}-N+2}\\ .& .& & .\\ .& .& ...& .\\ .& .& & .\\ p_{N-1}& p_{N-2}& ...& p_0\end{array}\right]}^{-1}\left[\begin{array}{c}{\tilde{s}}_0^{i-1}-s_{{\mathrm{MK}-T}_g}^i\\ {\tilde{s}}_1^{i-1}-s_{\mathrm{MK}-T_g+1}^i\\ .\\ .\\ .\\ {\tilde{s}}_{N-1}^{i-1}-s_{\mathrm{MK}-T_g+N-1}^i\end{array}\right]---\left(4\right).$

More than in current demand signal, to mention symbol front and equate as the top n sampling point of CP and the top n sampling point of a upper signal for getting continuously.Also can discontinuously get these equal sampling points, for example, only get 2 consecutive hourss, can discontinuously get the 1st and the 2nd point, equate with the 3rd but get the 1st with the corresponding sampling point of a upper signal, this routine Chinese style (3) becomes:

$\left[\begin{array}{c}{\tilde{s}}_{\mathrm{MK}-T_g}^i\\ {\tilde{s}}_{\mathrm{MK}-T_g+2}^i\end{array}\right]=\left[\begin{array}{c}{s}_{\mathrm{MK}-T_g}^i\\ s_{\mathrm{MK}-T_g+2}^i\end{array}\right]+\left[\begin{array}{cc}{p}_0& p_{\mathrm{MK}-2}\\ p_2& p_0\end{array}\right]\·\left[\begin{array}{c}{c}_0^i\\ c_2^i\end{array}\right]=\left[\begin{array}{c}{\tilde{s}}_0^{i-1}\\ {\tilde{s}}_2^{i-1}\end{array}\right]---\left(5\right)$

Thereby push away to such an extent that amplitude-phase adjustment coefficient is,

$\left[\begin{array}{c}{c}_0^i\\ c_2^i\end{array}\right]={\left[\begin{array}{cc}{p}_0& p_{\mathrm{MK}-2}\\ p_2& p_0\end{array}\right]}^{-1}\left[\begin{array}{c}{\tilde{s}}_0^{i-1}-s_{\mathrm{MK}-T_g}^i\\ {\tilde{s}}_2^{i-1}-s_{\mathrm{MK}-T_g+2}^i\end{array}\right],---\left(6\right)$

S204, adjust coefficient generted noise signal according to N Kernel signal and corresponding amplitude-phase.

Continuous noise generative process can be expressed as:

${\mathrm{cn}}^i=c_0^i\·p_{{\mathrm{MK}-T}_g}+c_1^i\·p_{\mathrm{MK}-T_g+1}+...+c_{N-1}^i\·p_{\mathrm{MK}-T_g+N-1}---\left(7\right)$

Also be that noise signal is N the stack of having carried out the Kernel signal of the different cyclic shifts of amplitude-phase adjustment, arrive

amplitude-phase corresponding to Kernel signal that is N different cyclic shifts of i signal adjusted coefficient.

After getting for discontinuous shown in formula (5) and formula (6) stack that identical points is corresponding, signal is

${\mathrm{cn}}^i=c_0^i\·p_{\mathrm{MK}-T_g}+c_2^i\·p_{\mathrm{MK}-T_g+2}---\left(8\right)$

S205, noise signal is added on i ofdm signal, generates i ofdm signal after adjusting.Also:

${\tilde{s}}^i=s^i+{\mathrm{cn}}^i$

S206, i ofdm signal after adjusting carried out to buffer memory, for the modulation use of i+1 ofdm signal, as shown in the dotted line in Fig. 2.

The present invention is not limited thereto, the top n sampling point of i ofdm signal after can buffer memory adjusting.And in the time of i+1 ofdm signal of modulation, in step S201, can only obtain the top n sampling point of i ofdm signal after adjustment and process.

S207, i ofdm signal after adjusting added to CP, and export.

I ofdm signal after adjustment adds after CP, and front several sampling points of CP are lucky to be equated at the front several sampling points that add before CP with i-1 ofdm signal after adjustment, thereby gets up continuously between signal, has reduced the leakage of out-of-band power.As shown in Figure 3, the CP of i ofdm signal, i.e. CP _itop n sampling point, i.e. A part shown in figure, at the top n sampling point not adding before CP, the B part shown in figure is identical with i-1 ofdm signal.

As shown in Figure 3, the CP after adjustment _ilength be greater than the CP of former OFDM _i, the visible effectively length of CP has increased, by original T _gbe increased to T _g+ N.Thereby embodiments of the invention, in effective inhibition zone external leakage, have also increased effective CP length, thereby have strengthened the ability of anti-ISI and ICI.

As shown in Figure 4, also can adopt in i ofdm signal and will extract CP part N sampling point before, i.e. C part shown in figure, with an afterbody N sampling point of i-1 ofdm signal, the B part shown in figure is identical.Because C part is continuous with sampling point below, thus B part also with C part sampling point below continuously, i ofdm signal adds after CP, the CP of interpolation and the afterbody of i-1 ofdm signal get up continuously.Adopt in this way, i ofdm signal front and back after equally also can making i-1 ofdm signal after adjusting and adjusting continuously.

Embodiment tri-

As shown in Figure 5, the present embodiment can comprise the steps:

S501, receive current ofdm signal and a upper ofdm signal;

S502, according to the signal generted noise signal of described reception;

S503, described noise signal is superimposed upon on described current ofdm signal, generates the current ofdm signal after adjusting; Wherein, the CP of the current ofdm signal after described adjustment and the afterbody of a upper ofdm signal are continuous.

By superimposed noise signal on current ofdm signal, make the CP of front ofdm signal and the afterbody of a upper ofdm signal continuous, can effectively suppress band outward leakage, strengthen the anti-ISI of OFDM and the ability of ICI.

Embodiment tetra-

As shown in Figure 6, the present embodiment can comprise the steps:

S601, i ofdm signal of reception, and i ofdm signal added to CP.

Having added i the ofdm signal of CP uses

represent.

I-1 the ofdm signal of CP added in S602, reception.I-1 the ofdm signal that has added CP can obtain from buffer memory.

S603, obtain and i the Kernel signal that ofdm signal is corresponding.

If N is a positive integer, the present embodiment is to ensure that the top n sampling point of CP after current ofdm signal superimposed noise signal is identical with the top n sampling point of a upper ofdm modulation signal.The Kernel signal of complete M times over-sampling is all the pattern of MK sampling point shown in formula (1), each section of the Kernel signal of N different cyclic shifts that what the N*N dot matrix in the present embodiment represented is p out ₀the matrix that near N sampling point forms.

$\left[\begin{array}{cccc}{p}_0& p_{\mathrm{MK}-1}& ...& p_{\mathrm{MK}-N+1}\\ p_1& p_0& ...& p_{\mathrm{MK}-N+2}\\ .& .& & .\\ .& .& ...& .\\ .& .& & .\\ p_{N-1}& p_{N-2}& ...& p_0\end{array}\right]$

Wherein, each row all represents to play the 1st N to a N sampling point in about half sampling point in the left side of Kernel signal of different cyclic shifts (N is less than CP length T g).If used

represent that Kernel signal p has carried out the approximately half sampling point on the left side after the cyclic shift of τ, all the other sampling point zero setting, are also

kernel signal phasor after the cyclic shift that in N*N dot matrix, first row is corresponding can be expressed as

this vector has MK element, and wherein the 1st to N N sampling point is [p ₀p ₁p _n-1], be also the first row element of above-mentioned N*N matrix.In like manner, in N*N dot matrix, secondary series element is in the 1st to N the sampling point of N, be also [p _mK-1p ₀p ₁p _n-2].In like manner can recursion to N column element.

S604, according to described i the ofdm signal and i-1 the ofdm signal that has added CP that has added CP, the Kernel signal that obtains N different cyclic shifts corresponding amplitude-phase adjustment coefficient respectively.

The top n sampling point of the modulation signal of i OFDM,

with the individual top n sampling point that does not contain the ofdm signal of CP of i-1,

need identically, just can make the CP of i ofdm signal after adjusting and the afterbody of i-1 ofdm signal continuously, realize continuous between signal.N Kernel signal respectively corresponding amplitude-phase to adjust the computing formula of coefficient as follows:

$\left[\begin{array}{c}{\tilde{s}}_{\mathrm{CP},0}^i\\ {\tilde{s}}_{\mathrm{CP},1}^i\\ .\\ .\\ .\\ {\tilde{s}}_{\mathrm{CP},N-1}^i\end{array}\right]=\left[\begin{array}{c}{s}_{\mathrm{CP},0}^i\\ s_{\mathrm{CP},1}^i\\ .\\ .\\ .\\ s_{\mathrm{CP},N-1}^i\end{array}\right]+\left[\begin{array}{cccc}{p}_0& p_{\mathrm{MK}-1}& ...& p_{\mathrm{MK}-N+1}\\ p_1& p_0& ...& p_{\mathrm{MK}-N+2}\\ .& .& & .\\ .& .& ...& .\\ .& .& & .\\ p_{N-1}& p_{N-2}& ...& p_0\end{array}\right]\·\left[\begin{array}{c}{c}_0^i\\ c_1^i\\ .\\ .\\ .\\ c_{N-1}^i\end{array}\right]=\left[\begin{array}{c}{s}_{{\mathrm{CP},T}_g}^{i-1}\\ s_{{\mathrm{CP},T}_g+1}^{i-1}\\ .\\ .\\ .\\ s_{{\mathrm{CP},T}_g+N-1}^{i-1}\end{array}\right]---\left(9\right)$

Obtain

$\left[\begin{array}{c}{c}_0^i\\ c_1^i\\ .\\ .\\ .\\ c_{N-1}^i\end{array}\right]={\left[\begin{array}{cccc}{p}_0& p_{\mathrm{MK}-1}& ...& p_{\mathrm{MK}-N+1}\\ p_1& p_0& ...& p_{\mathrm{MK}-N+2}\\ .& .& & .\\ .& .& ...& .\\ .& .& & .\\ p_{N-1}& p_{N-2}& ...& p_0\end{array}\right]}^{-1}\left[\begin{array}{c}{s}_{{\mathrm{CP},T}_g}^{i-1}-s_{\mathrm{CP},0}^i\\ s_{\mathrm{CP},T_g+1}^{i-1}-s_{\mathrm{CP},1}^i\\ .\\ .\\ .\\ s_{{\mathrm{CP},T}_g+N-1}^{i-1}-s_{\mathrm{CP},N-1}^i\end{array}\right]---\left(10\right)$

S605, adjust coefficient generted noise signal according to Kernel signal and corresponding amplitude-phase, obtain the noise signal of i ofdm signal

${\mathrm{cn}}_{\mathrm{CP}}^i=c_0^i\·p_0^{\mathrm{Left}}+c_1^i\·p_1^{\mathrm{Left}}+...+c_{N-1}^i\·p_{N-1}^{\mathrm{left}}---\left(11\right)$

S606, the noise signal that step S605 is obtained are added to and have added on i the ofdm signal of CP, generate and export i ofdm signal after the adjustment of having added CP.

${\tilde{s}}_{\mathrm{CP}}^i=s_{\mathrm{CP}}^i+{\mathrm{cn}}_{\mathrm{CP}}^i---\left(12\right)$

The top n sampling point of the CP of i ofdm signal after adjustment, is identical with the top n sampling point of i-1 the ofdm signal that does not add CP, and the modulation signal of i OFDM and the afterbody of i-1 ofdm signal after adjusting are in other words continuous.Due to the sampling point of middle afterbody is all set to 0, thus noise signal be only superimposed upon i ofdm signal before, and afterbody does not change.

Because the Kernel signal of using in the present embodiment is all that rear several sampling points are 0, be 0 so noise signal is also latter half, the afterbody of now going up an ofdm signal equates with the afterbody of the upper ofdm signal after adjustment; If also the CP of current ofdm signal and the afterbody of a upper ofdm signal are continuous, the afterbody of the upper ofdm signal after the CP of so current ofdm signal and adjustment is also continuous.

S607, i the ofdm signal that has added CP carried out to buffer memory to offer the modulation of i+1 ofdm signal.This step also can be after S601 or other step.

The present embodiment has been realized the continuous of i ofdm signal after adjusting and i-1 ofdm signal, thereby has suppressed out-of-band power leakage, has strengthened the ability of anti-ISI and ICI.

Embodiment five

As shown in Figure 7, the present embodiment can comprise the steps:

I-1 ofdm signal after S701, i ofdm signal of reception and adjustment.

S702, the difference of i-1 ofdm signal according to i ofdm signal and after adjusting are obtained desirable noise signal.

Wherein, i-1 ofdm signal after adjustment can obtain from buffer memory.Described desirable noise signal

for front several sampling points of the CP part in current ofdm signal with adjust after the difference signal of front several sampling points of i-1 ofdm signal.Formula table is shown:

S703, by desirable noise

carry out FFT and transform to frequency domain.

S704, according to the difference of the weight of each subcarrier corresponding to i ofdm signal, to desirable noise signal

frequency-region signal carry out weight adjustment, and convert back time domain, obtain the approximate noise signal of desirable noise signal

Here the difference of the weight of each subcarrier is carried out, and to adjust principle consistent with the weight of the Kernel signal of embodiment bis-.

S705, adjust the approximate noise signal of desirable noise signal

amplitude obtain noise signal cn ⁱ.

S704 is converted back to the approximate noise signal of time domain

the amplitude of carrying out adjustment obtains noise signal cn ⁱ.Specifically can or adjust the amplitude of noise in time domain signal according to high-amplitude etc. according to the energy of top n sampling point.

S706, the noise signal cn that S705 is obtained ⁱbe added to and generate i ofdm signal after adjusting on i ofdm signal.

S707, i ofdm signal after adjusting added to CP, and export.

S708, i ofdm signal after adjusting carried out to the modulation use of buffer memory for i+1 ofdm signal.

Embodiment six

As shown in Figure 8, embodiments of the invention provide the modulator approach of another kind of ofdm signal, can comprise the steps:

S801, obtain added CP current ofdm signal, added a upper ofdm signal of CP and a upper ofdm signal of first noise signal that superposeed;

S802, according to having added the described current ofdm signal of CP and a upper ofdm signal of described first noise signal that superposeed, generate the second noise signal of an ofdm signal; Described the second noise signal is superimposed upon on a upper ofdm signal of described first noise signal that superposeed, generates the upper OFDM after adjusting;

S803, according to the described current ofdm signal and the described upper ofdm signal that has added CP that have added CP, generate the first noise signal of current ofdm signal, and described the first noise signal is superimposed upon on described current ofdm signal, the superposeed current ofdm signal of the first noise signal of generation, the afterbody of the upper ofdm signal after CP and the described adjustment of the current ofdm signal of described first noise that superposeed is continuous.

In embodiment six and embodiment seven, a upper ofdm signal of superposeed the first noise signal and the second noise signal is called to the upper ofdm signal after adjustment.

The present embodiment is by the first noise signal and the second noise signal of superposeing on ofdm signal, thereby the afterbody of the upper ofdm signal after the CP of the current ofdm signal of first noise that made to superpose and adjustment is continuous, thereby suppress out-of-band power leakage, strengthened the ability of anti-ISI and ICI.

Embodiment seven

As shown in Figure 9, the present embodiment can comprise the steps:

S901, obtain added CP i ofdm signal, added i-1 ofdm signal of i-1 the ofdm signal of CP and first noise signal that superposeed.

Can from buffer memory, obtain described i-1 the ofdm signal of CP and i-1 the ofdm signal of first noise signal that superposeed of having added.Wherein, i-1 ofdm signal of first noise signal that superposeed, is the first noise signal generation that superposeed on i-1 the ofdm signal that has added CP.

S902a, generation the 2nd kernel signal.

The 2nd kernel signal is the weight generation according to each subcarrier in i-1 ofdm signal, specifically generates in the S202 of scheme and embodiment bis-step identical.Each section of the Kernel signal of N different cyclic shifts that what the N*N dot matrix in the present embodiment represented is p out ₀the matrix that near N sampling point forms, as follows:

Wherein, each row all represents to play last N sampling point in about half sampling point in the right of Kernel signal of different cyclic shifts (N is less than CP length T g).If used

represent that Kernel signal p has carried out the approximately half sampling point on the right after the cyclic shift of τ, all the other sampling point zero setting, τ is herein more than or equal to MK-N, is also

kernel signal phasor after the cyclic shift that in N*N dot matrix, first row is corresponding can be expressed as

this vector has MK element, and wherein last N sampling point is [p _mK-N+1p _mK-N+2p ₀], be also the first row element of above-mentioned N*N matrix.In like manner, in N*N dot matrix, secondary series element is

in last N sampling point, be also [p _mK-N+2p ₀p ₁].In like manner can recursion to N column element.

S902b, generation the one Kernel signal.

Wherein, a kernel signal is to generate according to the weight of each subcarrier in current ofdm signal, specifically generates in the S202 of scheme and embodiment bis-step identical.Each section of the Kernel signal of N different cyclic shifts that what the N*N dot matrix in the present embodiment represented is p out ₀the matrix that near N sampling point forms, as follows:

$\left[\begin{array}{cccc}{p}_0& p_{\mathrm{MK}-1}& ...& p_{\mathrm{MK}-N+1}\\ p_1& p_0& ...& p_{\mathrm{MK}-N+2}\\ .& .& & .\\ .& .& ...& .\\ .& .& & .\\ p_{N-1}& p_{N-2}& ...& p_0\end{array}\right],$

S903a, according to i-1 the ofdm signal that has added i the ofdm signal of CP and first noise that superposeed, obtain N the 2nd Kernel signal respectively corresponding amplitude-phase adjust coefficient $c_{\mathrm{0,2}}^{i-1},c_{\mathrm{1,2}}^{i-1}......c_{N-\mathrm{1,2}}^{i-1}.$

, obtain with N sampling point and the principle that equates of the mean value of the afterbody N sampling point of i-1 ofdm signal of first noise that superposeed before being positioned at the CP of i the ofdm signal that has added CP according to last N sampling point of the modulation signal of i-1 OFDM with following formula (13).Wherein, be positioned at N sampling point use before the CP of i the ofdm signal that has added CP $\begin{array}{ccc}{{\tilde{S}}^i}_{\mathrm{CP},\mathrm{MK}-N},& s_{\mathrm{CP},,\mathrm{MK}-N+1}^i& ......\end{array}$ $s_{\mathrm{CP},\mathrm{MK}-1}^i$ Represent, afterbody N sampling point of i-1 ofdm signal of first noise that superposeed used $\begin{array}{cccc}{\tilde{s}}_{\mathrm{CP},1,\mathrm{MK}+T_g-N}^{i-1},& {\tilde{s}}_{\mathrm{CP},1,\mathrm{MK}+T_g-N+1}^{i-1},& ......& {\tilde{s}}_{\mathrm{CP},1,\mathrm{MK}+T_g-1}^{i-1}\end{array}$ Represent.

S903b, according to having added i the ofdm signal of CP and having added i-1 the ofdm signal of CP, obtain a N Kernel signal respectively corresponding amplitude-phase adjust coefficient

particularly, the top n sampling point that has added i the ofdm signal of CP is:

the top n sampling point of i-1 ofdm signal is:

continuously, the top n sampling point of i the ofdm signal of reason is interpolation on the right of N sampling point and the formula (15) before the CP that is positioned at i the ofdm signal that has added CP on formula (13) the right CP is continuous for equation the right of formula (15) and the equation of formula (13) the right; The stack on formula (13) the right the afterbody N sampling point of i-1 ofdm signal of the first noise continuous with the top n sampling point of the middle interpolation of formula (15) CP i-1 ofdm signal before.

$\left[\begin{array}{c}{\tilde{s}}_{\mathrm{CP},1,0}^i\\ {\tilde{s}}_{\mathrm{CP},\mathrm{1,1}}^i\\ .\\ .\\ .\\ {\tilde{s}}_{\mathrm{CP},1,N-1}^i\end{array}\right]=\left[\begin{array}{c}{s}_{\mathrm{CP},0}^i\\ s_{\mathrm{CP},1}^i\\ .\\ .\\ .\\ s_{\mathrm{CP},N-1}^i\end{array}\right]+\left[\begin{array}{cccc}{p}_0& p_{\mathrm{MK}-1}& ...& p_{\mathrm{MK}-N+1}\\ p_1& p_0& ...& p_{\mathrm{MK}-N+2}\\ .& .& & .\\ .& .& ...& .\\ .& .& & .\\ p_{N-1}& p_{N-2}& ...& p_0\end{array}\right]\·\left[\begin{array}{c}{c}_{\mathrm{0,1}}^i\\ c_{\mathrm{1,1}}^i\\ .\\ .\\ .\\ c_{N-1,1}^i\end{array}\right]$

$=\left[\begin{array}{c}0.5\·(s_{\mathrm{CP},T_g}^{i-1}+s_{\mathrm{CP},0}^i)\\ 0.5\·(s_{\mathrm{CP},T_g+1}^{i-1}+s_{\mathrm{CP},1}^i)\\ .\\ .\\ .\\ 0.5\·(s_{\mathrm{CP},T_g+N-1}^{i-1}+s_{\mathrm{CP},N-1}^i)\end{array}\right]---\left(15\right)$

$\left[\begin{array}{c}{c}_{\mathrm{0,1}}^i\\ c_{\mathrm{1,1}}^i\\ .\\ .\\ .\\ c_{N-\mathrm{1,1}}^i\end{array}\right]={\left[\begin{array}{cccc}{p}_0& p_{\mathrm{MK}-1}& ...& p_{\mathrm{MK}-N+1}\\ p_1& p_0& ...& p_{\mathrm{MK}-N+2}\\ .& .& & .\\ .& .& ...& .\\ .& .& & .\\ p_{N-1}& p_{N-2}& ...& p_0\end{array}\right]}^{-1}\left[\begin{array}{c}0.5\·(s_{{\mathrm{CP},T}_g}^{i-1}-s_{\mathrm{CP},0}^i)\\ 0.5\·(s_{\mathrm{CP},T_g+1}^{i-1}-s_{\mathrm{CP},1}^i)\\ .\\ .\\ .\\ 0.5\·(s_{\mathrm{CP},T_g+N-1}^{i-1}-s_{\mathrm{CP},N-1}^i)\end{array}\right]---\left(16\right)$

S904a, adjust coefficient and generate the second noise signal of i-1 ofdm signal according to the 2nd Kernel signal and corresponding amplitude-phase.

S904b, adjust coefficient and generate the first noise signal of i ofdm signal according to a Kernel signal and corresponding amplitude-phase.

S905a, the second noise signal is added to and has been superposeed on i-1 ofdm signal of the first noise, generate i-1 ofdm signal after adjusting, and export.

S905b, the first noise signal is added on i ofdm signal, and this signal is carried out to buffer memory, use for the modulation of i+1 ofdm signal, as shown in the dotted line in Fig. 8.

In addition, also need i-1 the ofdm signal that has added CP to carry out buffer memory, use for the modulation of i+1 ofdm signal.

Embodiments of the invention are by the first noise signal and the second noise signal of superposeing on ofdm signal, make the afterbody of i-1 ofdm signal after adjusting, continuous with the CP of i ofdm signal after adjustment, realize the continuous of ofdm signal, thereby suppress out-of-band power leakage, strengthened the anti-ISI of OFDM and the ability of ICI.

One of ordinary skill in the art will appreciate that all or part of flow process realizing in above-described embodiment method, can carry out the hardware that instruction is relevant by computer program to complete, described program can be stored in a computer read/write memory medium, this program, in the time carrying out, can comprise as the flow process of the embodiment of above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.

As shown in figure 10, embodiments of the invention provide a kind of modulating device of ofdm signal, comprising:

Receiving element 101, for receiving the upper ofdm signal after current ofdm signal and a upper ofdm signal or adjustment;

Noise generation unit 102, for according to the signal generted noise signal of described reception;

Signal generation unit 103, for described noise signal is superimposed upon to described current ofdm signal, generate the current ofdm signal after adjusting, wherein, if what described receiving element 101 received is current ofdm signal and a upper ofdm signal, the CP of the current ofdm signal after described adjustment and the afterbody of a described upper ofdm signal are continuous; If what described receiving element 101 received is the upper ofdm signal after current ofdm signal and adjustment, the afterbody of the upper ofdm signal after the CP of the current ofdm signal after described adjustment and adjustment is continuous.

On the basis of such scheme, as shown in figure 11, described noise generation unit 102 comprises:

Acquisition module 1021, for obtaining several class pulses Kernel signal of the different cyclic shifts corresponding from described current ofdm signal;

Coefficient generation module 1022, for the upper ofdm signal according to described current ofdm signal and a upper ofdm signal or after adjusting, obtains amplitude-phase corresponding to described several Kernel signals difference and adjusts coefficient;

Noise generation module 1023, for generating described noise signal according to described Kernel signal and corresponding amplitude-phase adjustment coefficient.

The modulating device of embodiments of the invention ofdm signal can further include: adding device and delay unit.Described adding device is for adding the CP of described current ofdm signal before or after the noise signal that superposeed.Described delay unit, the modulation signal of the current OFDM generating for signal generation unit described in buffer memory is to offer next ofdm signal.

As shown in figure 12, embodiments of the invention provide the modulating device of another kind of ofdm signal, comprising:

Acquiring unit 121, added for obtaining CP current ofdm signal, added a upper ofdm signal of CP and a upper ofdm signal of first noise signal that superposeed;

Noise generation unit 122, for according to having added the described current ofdm signal of CP and a upper ofdm signal of described first noise signal that superposeed, generates the second noise signal of an ofdm signal; Described the second noise signal is superimposed upon on a upper ofdm signal of described first noise signal that superposeed, generates the upper OFDM after adjusting;

Signal generation unit 123, be used for according to the described current ofdm signal and the described upper ofdm signal that has added CP that have added CP, generate the first noise signal of current ofdm signal, and described the first noise signal is superimposed upon on described current ofdm signal, the superposeed current ofdm signal of the first noise signal of generation, the afterbody of the upper ofdm signal after CP and the described adjustment of the current ofdm signal of described first noise that superposeed is continuous.

As shown in figure 13, on the basis of such scheme, described noise generation unit 122 comprises:

Acquisition module 1221, for obtaining several the 2nd Kernel signals and several kernel signals corresponding with current ofdm signal, that equate with described the 2nd Kernel signal number of the different cyclic shifts corresponding from a upper ofdm signal after described adjustment;

Coefficient generation module 1222, be used for according to a upper ofdm signal that has added the described current ofdm signal of CP and first noise signal that superposeed, generate amplitude-phase corresponding to described several the 2nd Kernel signals difference and adjust coefficient, according to the described current ofdm signal and the described upper ofdm signal that has added CP that have added CP, generate amplitude-phase corresponding to described several Kernel signals difference and adjust coefficient;

Noise generation module 1223, generate the second noise signal of a described upper ofdm signal for adjusting coefficient according to described the 2nd Kernel signal and corresponding amplitude-phase, adjust coefficient and generate the first noise signal of described current ofdm signal according to a described Kernel signal and corresponding amplitude-phase.

The modulating device of embodiments of the invention ofdm signal, can, with reference to the embodiment mono-to embodiment seven in the modulator approach of above-mentioned ofdm signal, complete the modulation of ofdm signal.

The modulating device of the ofdm signal that embodiments of the invention provide, by superimposed noise signal on ofdm signal, make the CP of modulation signal and the afterbody of a upper ofdm signal of current OFDM continuous, realize the continuous of ofdm signal, effectively suppress band outward leakage, strengthened the anti-ISI of OFDM and the ability of ICI.

The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (16)

1. a modulator approach for ofdm signal, is characterized in that, comprising:

Receive the upper ofdm signal after current ofdm signal and a upper ofdm signal or adjustment;

According to the signal generted noise signal of described reception;

Described noise signal is superimposed upon on described current ofdm signal, generates the current ofdm signal after adjusting, the afterbody of the upper ofdm signal after the Cyclic Prefix of the current ofdm signal after described adjustment and a described upper ofdm signal or adjustment is continuous;

Described according to the signal generted noise signal of described reception, be specially:

Obtain several class pulses Kernel signal of the different cyclic shifts corresponding from described current ofdm signal;

A upper ofdm signal according to described current ofdm signal and a upper ofdm signal or after adjusting, obtains amplitude-phase corresponding to described several Kernel signals difference and adjusts coefficient;

Generate described noise signal according to described Kernel signal and corresponding amplitude-phase adjustment coefficient.

2. method according to claim 1, is characterized in that, between the adjacent Kernel signal in described several Kernel signals, differs a displacement;

Described noise signal is the sum of products that described several Kernel signals and corresponding amplitude-phase are adjusted coefficient.

3. method according to claim 2, is characterized in that, described Kernel signal is the n dimensional vector n that the weight of each subcarrier corresponding according to current ofdm signal generates.

4. method according to claim 1, is characterized in that, if reception is current ofdm signal and a upper ofdm signal, described method further comprises: receiving after described current ofdm signal, adding the Cyclic Prefix of described current ofdm signal;

Generating after described several Kernel signals, the sampling point of the afterbody predetermined number of described several Kernel signals is set to zero.

5. method according to claim 1, it is characterized in that, if reception is the upper ofdm signal after current ofdm signal and adjustment, the afterbody of the upper ofdm signal after the Cyclic Prefix of the current ofdm signal after described adjustment and adjustment is continuous, is specially:

Front several sampling points in the Cyclic Prefix of the current ofdm signal after described adjustment equate with several sampling points of the afterbody of the upper ofdm signal after adjustment.

6. method according to claim 1, is characterized in that, if reception is the upper ofdm signal after current ofdm signal and adjustment, described according to the signal generted noise signal of described reception, is specially:

The difference signal of several sampling points in the upper ofdm signal after extracting described current ofdm signal and adjusting generates described noise signal.

7. method according to claim 6, is characterized in that, described method further comprises:

The difference signal of several sampling points in the upper ofdm signal by described current ofdm signal and after adjusting transforms to frequency domain;

According to the difference of the weight of each subcarrier corresponding to described current ofdm signal, the difference signal of described several sampling points is carried out to weight adjustment, and convert back time domain;

The amplitude of the difference signal of described several sampling points of adjustment also generates described noise signal.

8. according to the method described in any one in claim 1 to 7, it is characterized in that,

If what receive is current ofdm signal and a upper ofdm signal, described method further comprises: described current ofdm signal is carried out to buffer memory to offer the modulation of next ofdm signal;

If what receive is the upper ofdm signal after current ofdm signal and adjustment, described method further comprises: the current ofdm signal after described adjustment is carried out to buffer memory to offer the modulation of next ofdm signal.

9. a modulator approach for ofdm signal, is characterized in that, comprising:

Obtain added Cyclic Prefix current ofdm signal, added a upper ofdm signal of Cyclic Prefix and a upper ofdm signal of first noise signal that superposeed;

According to having added the described current ofdm signal of Cyclic Prefix and a upper ofdm signal of described first noise signal that superposeed, generate the second noise signal of an ofdm signal; Described the second noise signal is superimposed upon on a upper ofdm signal of described first noise signal that superposeed, generates the upper OFDM after adjusting;

According to the described current ofdm signal and the described upper ofdm signal that has added Cyclic Prefix that have added Cyclic Prefix, generate the first noise signal of current ofdm signal, and described the first noise signal is superimposed upon on described current ofdm signal, the superposeed current ofdm signal of the first noise signal of generation, the afterbody of the upper ofdm signal after Cyclic Prefix and the described adjustment of the current ofdm signal of described first noise that superposeed is continuous;

Wherein, the second noise signal of the upper ofdm signal of described generation, be specially: several the 2nd Kernel signals that obtain the different cyclic shifts corresponding from a upper ofdm signal after described adjustment, according to a upper ofdm signal that has added the described current ofdm signal of Cyclic Prefix and first noise signal that superposeed, obtain amplitude-phase corresponding to described several the 2nd Kernel signals difference and adjust coefficient, generate described the second noise signal according to described the 2nd Kernel signal and corresponding amplitude-phase adjustment coefficient;

The first noise signal of the current ofdm signal of described generation, be specially: obtain current ofdm signal corresponding, several Kernel signals of the different cyclic shifts that equate from the number of described the 2nd Kernel signal, according to the described current ofdm signal and the described upper ofdm signal that has added Cyclic Prefix that have added Cyclic Prefix, obtain amplitude-phase corresponding to described several Kernel signals difference and adjust coefficient, generate described the first noise signal according to a described Kernel signal and corresponding amplitude-phase adjustment coefficient.

10. method according to claim 9, is characterized in that, between the adjacent Kernel signal in described several Kernel signals or several the 2nd Kernel signals, differs a displacement;

The first noise signal of described current ofdm signal is the sum of products that described several Kernel signals and corresponding amplitude-phase are adjusted coefficient;

The second noise signal of a described upper ofdm signal is the sum of products that described several the 2nd Kernel signals and corresponding amplitude-phase are adjusted coefficient.

11. methods of stating according to claim 10, is characterized in that, a described Kernel signal is the n dimensional vector n that the weight of each subcarrier corresponding according to current ofdm signal generates; Described the 2nd Kernel signal is the n dimensional vector n that the weight of each subcarrier corresponding according to a upper ofdm signal generates.

12. according to the method described in any one in claim 9 to 11, it is characterized in that, described method further comprises:

The current ofdm signal of described first noise that superposeed and the current ofdm signal that has added Cyclic Prefix are carried out to buffer memory to offer next ofdm signal.

The modulating device of 13. 1 kinds of ofdm signals, is characterized in that, comprising:

Receiving element, for receiving the upper ofdm signal after current ofdm signal and a upper ofdm signal or adjustment;

Noise generation unit, for according to the signal generted noise signal of described reception;

Signal generation unit, for described noise signal is superimposed upon to described current ofdm signal, generate the current ofdm signal after adjusting, the afterbody of the upper ofdm signal after the afterbody of the Cyclic Prefix of the current ofdm signal after described adjustment and a described upper ofdm signal or adjustment is continuous;

Described noise generation unit comprises:

Acquisition module, for obtaining several class pulses Kernel signal of the different cyclic shifts corresponding from described current ofdm signal;

Coefficient generation module, for the upper ofdm signal according to described current ofdm signal and a upper ofdm signal or after adjusting, obtains amplitude-phase corresponding to described several Kernel signals difference and adjusts coefficient;

Noise generation module, for generating described noise signal according to described Kernel signal and corresponding amplitude-phase adjustment coefficient.

The modulating device of 14. ofdm signals according to claim 13, is characterized in that, further comprises:

Adding device, for adding the Cyclic Prefix of described current ofdm signal before or after the noise signal that superposeed.

15. according to the modulating device of the ofdm signal described in claim 13 or 14, it is characterized in that, further comprises:

Delay unit, the current ofdm signal after generating for signal generation unit described in buffer memory or described current ofdm signal are to offer next ofdm signal.

The modulating device of 16. 1 kinds of ofdm signals, is characterized in that, comprising:

Acquiring unit, added for obtaining Cyclic Prefix current ofdm signal, added a upper ofdm signal of Cyclic Prefix and a upper ofdm signal of first noise signal that superposeed;

Noise generation unit, for according to having added the described current ofdm signal of Cyclic Prefix and a upper ofdm signal of described first noise signal that superposeed, generates the second noise signal of an ofdm signal; Described the second noise signal is superimposed upon on a upper ofdm signal of described first noise signal that superposeed, generates the upper OFDM after adjusting;

Signal generation unit, be used for according to the described current ofdm signal and the described upper ofdm signal that has added Cyclic Prefix that have added Cyclic Prefix, generate the first noise signal of current ofdm signal, and described the first noise signal is superimposed upon on described current ofdm signal, the superposeed current ofdm signal of the first noise signal of generation, the afterbody of the upper ofdm signal after Cyclic Prefix and the described adjustment of the current ofdm signal of described first noise that superposeed is continuous;

Wherein, described noise generation unit comprises:

Acquisition module, for obtaining several the 2nd Kernel signals and several kernel signals corresponding with current ofdm signal, that equate with described the 2nd Kernel signal number of the different cyclic shifts corresponding from a upper ofdm signal after described adjustment;

Coefficient generation module, be used for according to a upper ofdm signal that has added the described current ofdm signal of Cyclic Prefix and first noise signal that superposeed, generate amplitude-phase corresponding to described several the 2nd Kernel signals difference and adjust coefficient, according to the described current ofdm signal and the described upper ofdm signal that has added Cyclic Prefix that have added Cyclic Prefix, generate amplitude-phase corresponding to described several Kernel signals difference and adjust coefficient;

Noise generation module, generate the second noise signal of a described upper ofdm signal for adjusting coefficient according to described the 2nd Kernel signal and corresponding amplitude-phase, adjust coefficient and generate the first noise signal of described current ofdm signal according to a described Kernel signal and corresponding amplitude-phase.

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