CN103269323B - A kind of multi-user's transform domain communication system and method - Google Patents

Abstract

The invention discloses a kind of multi-user's transform domain communication system and method, conventional base modulation waveform generation method is adopted to form initial basis modulation waveform, introduce perfect autocorrelation sequence to carry out Kronecker with initial basis modulation waveform and be multiplied, the final fundamental modulation waveform obtained thus has part perfectly their cross correlation, modulated by the CCSK of part-circular periphery intercycle again, when modulating CCSK, circumferential cycle interval limits, make to meet strict orthogonality condition between the signal of communication of often couple of user in multi-user's transform domain communication system, thus inter-user interference when eliminating multi-user communication completely, improve the performance of multi-user's transform domain communication system.

Description

A kind of multi-user's transform domain communication system and method

Technical field

The invention belongs to communication technical field, more specifically say, relate to a kind of multi-user's transform domain communication system and method.

Background technology

Along with the continuous growth of wireless communication needs, frequency spectrum resource growing tension, it is idle that the frequency spectrum resource of simultaneously having authorized exists in various degree over time and space, become the new bottleneck of restriction Development of Wireless Communications, this just requires that future communication systems is while guarantee reliability and validity, also to possess the dynamic access ability of frequency spectrum, to improve frequency spectrum resource utilization rate.Cognitive radio (CognitiveRadio, CR) technology is arisen at the historic moment, and its core concept is that user has learning ability, can with surrounding environment interactive information, with perception with utilize at the usable spectrum of this environment space, and restriction and reduce the generation of conflict.Wherein, transform domain communication system (TransformDomainCommunicationSystem, TDCS), with its spectrum utilization, unique anti-interference and low intercepting and capturing characteristic flexibly, becomes a kind of important technology of CR technical field.

In TDCS system, in order to make full use of idle frequency spectrum resource, TDCS system is decomposed into a series of separate spectrum idle frequency range, in conjunction with random phase maker, produce TDCS system-based modulation waveform, signal to be sent is undertaken modulating the final transmission signal of generation by circumferential cycle modulation (CircularCyclicShiftKeying, CCSK) by transmitting terminal, receiving terminal adopts same way formation base modulation waveform, with this, transmission signal is carried out demodulation and recovers primary signal.By the way, send signal and there is the statistical property being similar to noise, therefore there is lower detection probability (mainly for unauthorized user).But, existing TDCS system still Shortcomings: when utilizing TDCS system to carry out the system group network of multi-user, there is multipair user in system to communicate simultaneously, often couple of user will distribute a distinctive pseudo random sequence for generation of fundamental modulation waveform, due to different user between fundamental modulation waveform no longer meet strict orthogonality condition, therefore can produce serious inter-user interference during multi-user communication, increase the error rate of Transform-domain Communication Technology.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art, a kind of multi-user's transform domain communication system and method are provided, make to meet strict orthogonality condition between the signal of communication of often couple of user in multi-user's transform domain communication system, eliminate inter-user interference, promote the performance of multi-user's transform domain communication system.

For achieving the above object, multi-user's transform domain communication system of the present invention, comprises multiple communication user pair, the transmitting terminal that each user is right and receiving terminal include fundamental modulation Waveform generating apparatus, for generation of the i-th, i=1,2 ..., the initial basis modulation waveform b that U user is right _i, wherein U is that in multi-user's transform domain communication system, communication user, to quantity, is characterized in that, described transmitting terminal also comprises:

The perfect autocorrelation sequence generation module of transmitting terminal, for generation of perfect autocorrelation sequence , its length L determines according to actual conditions, and perfect autocorrelation sequence A is sent to transmitting terminal Kronecker multiplication module;

Transmitting terminal Kronecker multiplication module, for by initial basis modulation waveform b _icarry out Kronecker multiplying with perfect autocorrelation sequence A, obtain final fundamental modulation waveform and send to the CCSK of P-CCSK(part-circular periphery intercycle) and modulation module, c _iin h element be:

c _i(h)＝a(l)×b _i(m),h＝lN+m,0≤l≤L-1,0≤m≤N-1；

P-CCSK modulation module, for adopting final fundamental modulation waveform c by signal to be sent _icarry out P-CCSK modulation obtain sending signal and send through transmitting antenna, the interval ω of circumferential cycle of i-th couple of user _imeet restrictive condition:

${\mathrm{\ω}}_i\∉\underset{j=1,i\≠j}{\overset{U}{\∪}}(-N+{\mathrm{\ω}}_j,N+{\mathrm{\ω}}_j);$

Described receiving terminal also comprises:

The perfect autocorrelation sequence generation module of receiving terminal, for generation of the perfect autocorrelation sequence consistent with transmitting terminal , and perfect autocorrelation sequence A is sent to receiving terminal Kronecker multiplication module;

Receiving terminal Kronecker multiplication module, for by initial basis modulation waveform b _icarry out Kronecker multiplying with perfect autocorrelation sequence A, obtain final fundamental modulation waveform and send to P-CCSK demodulation module, c _iin h element be:

c _i(h)＝a(l)×b _i(m),h＝lN+m,0≤l≤L-1,0≤m≤N-1；

P-CCSK demodulation module, for by the Received signal strength of reception antenna and final fundamental modulation waveform c _icarry out part-circular periphery circular correlation, carry out demodulation to received signal, obtain signaling protein14-3-3 signal to be sent.

Wherein, random phasic serial signal P _iadopt pseudo-random phase sequences, generation method is: first produce PRBS pseudo-random bit sequence, and the phase mapper then being inputed to the tap of r position obtains corresponding pseudo-random phase sequences P _i, tap figure place r determines according to actual conditions.

The present invention also provides a kind of multi-user's transform domain communication method, it is characterized in that comprising the following steps:

(1), in multi-user's transform domain communication system communication user is designated as U to quantity, the i-th, i=1,2 ..., the transmitting terminal that U user is right and receiving terminal are adopted and are produced final fundamental modulation waveform in a like fashion respectively, and the generation method of final fundamental modulation waveform is:

1.1), initial basis modulation waveform b is produced _i;

1.2), perfect autocorrelation sequence is generated , its length L determines according to actual conditions, and each user is to all adopting same perfect autocorrelation sequence;

1.3), by initial basis modulation waveform b _icarry out Kronecker multiplying with perfect autocorrelation sequence A, obtain final fundamental modulation waveform , c _iin h element be:

c _i(h)＝a(l)×b _i(m),h＝lN+m,0≤l≤L-1,0≤m≤N-1；

(2), signal to be sent is adopted final fundamental modulation waveform c by transmitting terminal _icarry out P-CCSK modulation and send through transmitting antenna, the interval ω of circumferential cycle that i-th user is right when modulating _imeet restrictive condition:

${\mathrm{\ω}}_i\∉\underset{j=1,i\≠j}{\overset{U}{\∪}}(-N+{\mathrm{\ω}}_j,N+{\mathrm{\ω}}_j);$

(3), receiving terminal obtains Received signal strength by reception antenna, by Received signal strength and final fundamental modulation waveform c _icarry out part-circular periphery circular correlation, thus achieve a butt joint collect mail number demodulation, obtain signaling protein14-3-3 signal to be sent.

Wherein, random phasic serial signal P _iadopt pseudo-random phase sequences, generation method is: first produce PRBS pseudo-random bit sequence, and the phase mapper then being inputed to the tap of r position obtains corresponding pseudo-random phase sequences P _i, tap figure place r determines according to actual conditions.

Multi-user's transform domain communication system of the present invention and method, conventional base modulation waveform generation method is adopted to form initial basis modulation waveform, introduce perfect autocorrelation sequence to carry out Kronecker with initial basis modulation waveform and be multiplied, the final fundamental modulation waveform obtained thus has part perfectly their cross correlation, modulated by the CCSK of part-circular periphery intercycle again, when modulating CCSK, circumferential cycle interval limits, make to meet strict orthogonality condition between the signal of communication of often couple of user in multi-user's transform domain communication system, thus inter-user interference when eliminating multi-user communication completely.

Accompanying drawing explanation

Fig. 1 is transmitting terminal system block diagram in a kind of embodiment of multi-user's transform domain communication system of the present invention;

Fig. 2 is receiving terminal system block diagram in a kind of embodiment of multi-user's transform domain communication system of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described, so that those skilled in the art understands the present invention better.Requiring particular attention is that, in the following description, when perhaps the detailed description of known function and design can desalinate main contents of the present invention, these are described in and will be left in the basket here.

Embodiment

During the work of multi-user's transform domain communication system, there is multipair user to communicate simultaneously, often couple of user transmitting terminal and receiving terminal each other, like the prior art, often couple of user can distribute a distinctive random sequence before communicating, namely often pair of user's transmitting terminal is identical with the random sequence of receiving terminal, and different user is different to the random sequence used.

Fig. 1 is transmitting terminal system block diagram in a kind of embodiment of multi-user's transform domain communication system of the present invention.As shown in Figure 1, in the present embodiment, in multi-user's transform domain communication system of the present invention, transmitting terminal comprises:

Transmitting terminal frequency spectrum sensing module 11, for adopting frequency spectrum perception technical limit spacing external environment condition electromagnetic property, obtain the power spectrum amplitude on different frequency point, Frequency point quantity is designated as N.Transmitting terminal frequency spectrum sensing module 11 is configured with the electromagnetic signal that reception antenna receives external environment condition.

Transmitting terminal frequency spectrum comparison module 12, for the power spectrum amplitude of all Frequency points obtained and presetting power spectrum amplitude threshold being compared, builds spectrum sequence , wherein S (n), n=0,1 ..., what N-1 represented each Frequency point takies situation, if the n-th power spectrum amplitude is greater than thresholding, represent that this Frequency point is occupied, setting this Frequency point numerical value S (n) is 0; If power spectrum amplitude is less than thresholding, represent that this Frequency point is idle, setting this Frequency point numerical value S (n) is 1.By power spectrum Amplitude Ratio comparatively, the spectrum sequence be made up of numerical value 0,1 can be obtained, be used for describing external environment condition Frequency point service condition.In multi-user's transform domain communication system, no matter as transmitting terminal or receiving terminal, all users are consistent by frequency spectrum perception with comparing the spectrum sequence obtained.

Transmitting terminal random sequence generator module 13, for generation of the i-th, i=1,2 ..., the random phasic serial signal of the transmitting terminal that U user is right , wherein U be in multi-user's transform domain communication system communication user to quantity.In actual applications, random phasic serial signal P _iadopt pseudo-random phase sequences.Produce pseudo-random phase sequences P _iconcrete mode be: first produce PRBS pseudo-random bit sequence, the phase mapper then being inputed to the tap of r position obtains corresponding pseudo-random phase sequences P _i, tap figure place r determines according to actual conditions.When embody rule is implemented, phase mapper can adopt 2 ^r-MPSK modulation or other similar fashion carry out phase mapping.

Transmitting terminal random phasic serial signal maker module 14, for the random phasic serial signal P that the spectrum sequence S that obtained by transmitting terminal frequency spectrum comparison module 12 and transmitting terminal random sequence generator module 13 obtain _icarry out by element multiplying, obtain the frequency spectrum random phasic serial signal B of multi-user's transform domain communication system _i=Sdiag (P _i).Frequency spectrum random phasic serial signal B _imainly for generation of the waveform with noise characteristic, there is low probability of intercept, and different users can be distinguished in access mode.

Transmitting terminal inverse Fourier transform module 15, for frequency spectrum random phasic serial signal B transmitting terminal random phasic serial signal maker module 14 exported _icarry out inverse Fourier transform and obtain initial basis modulation waveform $b_i=\{b_i\left(0\right),b_i\left(1\right),\·\·\·,b_i(N-1)\}=\mathrm{IFFT}\left\{B_i\right\}$ , b _iin the n-th element be:

$b_i\left(n\right)=\mathrm{\λ}\underset{k=0}{\overset{N-1}{\mathrm{\Σ}}}S\left(k\right)e^{{\mathrm{jm}}_i\left(k\right)}{e}^{\frac{j2\mathrm{\πkn}}{N}}=\mathrm{\λ}\underset{k\∈{\mathrm{\Ω}}^C}{\mathrm{\Σ}}{e}^{j{m}_i\left(k\right)}{e}^{\frac{j2\mathrm{\πkn}}{N}}$

Wherein, λ is the power normalization factor, Ω ^cfor numerical value in spectrum sequence S is the element set of 1, i.e. the set of idle frequence point;

The initial basis modulation waveform b that transmitting terminal inverse Fourier transform module 15 will obtain _isend to transmitting terminal Kronecker multiplication module 17.

In the present embodiment, transmitting terminal frequency spectrum sensing module 11, transmitting terminal frequency spectrum comparison module 12, transmitting terminal random sequence generator module 13, transmitting terminal random phasic serial signal maker module 14 and transmitting terminal inverse Fourier transform module 15 form transmitting terminal fundamental modulation Waveform generating apparatus, produce the initial basis modulation waveform b of transmitting terminal _i, its production method is prior art.

The perfect autocorrelation sequence generation module 16 of transmitting terminal, for generation of perfect autocorrelation sequence , its length L determines according to actual conditions, and perfect autocorrelation sequence A is sent to transmitting terminal Kronecker multiplication module 17.Perfect autocorrelation sequence is a kind of sequence with desirable circumference auto-correlation function, and namely its circumference auto-correlation function meets:

Wherein, mod represents complementation.

Transmitting terminal Kronecker multiplication module 17, for by initial basis modulation waveform b _icarry out Kronecker multiplying with perfect autocorrelation sequence A, obtain final fundamental modulation waveform and send to P-CCSK modulation module 18, c _iin h element be:

c _i(h)＝a(l)×b _i(m),h＝lN+m,0≤l≤L-1,0≤m≤N-1。

The final fundamental modulation waveform c obtained thus _ithere is part perfectly their cross correlation.

P-CCSK modulation module 18, the final fundamental modulation waveform c obtained for signal to be sent being adopted transmitting terminal Kronecker multiplication module 17 _icarry out the CCSK of P-CCSK(part-circular periphery intercycle) modulation obtain send signal.The circumferential cycle interval that i-th user is right is designated as ω _i, in order to ensure the strict orthogonal of multi-user communication signal, namely eliminate inter-user interference, the interval demand fulfillment restrictive condition of the circumferential cycle that in multi-user's transform domain communication system, user is right:

${\mathrm{\ω}}_i\∉\underset{j=1,i\≠j}{\overset{U}{\∪}}(-N+{\mathrm{\ω}}_j,N+{\mathrm{\ω}}_j).$

P-CCSK modulation module 18 sends modulating the transmission signal obtained through transmitting antenna.

Fig. 2 is receiving terminal system block diagram in a kind of embodiment of multi-user's transform domain communication system of the present invention.As shown in Figure 2, in the present embodiment, in multi-user's transform domain communication system of the present invention, transmitting terminal comprises:

Receiving terminal frequency spectrum sensing module 21, for adopting frequency spectrum perception technical limit spacing external environment condition electromagnetic property, obtains the power spectrum amplitude on different frequency point.In the present embodiment, the perception antenna of receiving terminal frequency spectrum sensing module 21 and P-CCSK demodulation module 28 are for receiving a set of antenna assembly of the receiving antenna multicoupler sending signal.

Receiving terminal frequency spectrum comparison module 22, for building spectrum sequence

Receiving terminal random sequence generator module 23, for generation of the random phasic serial signal of the right receiving terminal of i-th user $P_i=\{e^{j{m}_i\left(0\right)},e^{j{m}_i\left(1\right)},\·\·\·,e^{j{m}_i(N-1)}\}.$

Receiving terminal random phasic serial signal maker module 24, for the random phasic serial signal P that the spectrum sequence S that obtained by receiving terminal frequency spectrum comparison module 22 and receiving terminal random sequence generator module 23 obtain _icarry out by element multiplying, obtain the frequency spectrum random phasic serial signal B of multi-user's transform domain communication system _i=Sdiag (P _i).

Receiving terminal inverse Fourier transform module 25, for frequency spectrum random phasic serial signal B receiving terminal random phasic serial signal maker module 24 exported _icarry out inverse Fourier transform and obtain initial basis modulation waveform $b_i=\{b_i\left(0\right),b_i\left(1\right),\·\·\·,b_i(N-1)\}=\mathrm{IFFT}\left\{B_i\right\}$ , b _iin the n-th element be:

$b_i\left(n\right)=\mathrm{\λ}\underset{k=0}{\overset{N-1}{\mathrm{\Σ}}}S\left(k\right)e^{j{m}_i\left(k\right)}{e}^{\frac{j2\mathrm{\πkn}}{N}}=\mathrm{\λ}\underset{K\∈{\mathrm{\Ω}}^C}{\mathrm{\Σ}}{e}^{j{m}_i\left(k\right)}{e}^{\frac{j2\mathrm{\πkn}}{N}}$

Wherein, λ is the power normalization factor, Ω ^cfor numerical value in spectrum sequence S is the element set of 1.

The initial basis modulation waveform b that receiving terminal inverse Fourier transform module 25 will obtain _isend to receiving terminal Kronecker multiplication module 27.

In the present embodiment, receiving terminal frequency spectrum sensing module 21, receiving terminal frequency spectrum comparison module 22, receiving terminal random sequence generator module 23, receiving terminal random phasic serial signal maker module 24 and receiving terminal inverse Fourier transform module 25 form receiving terminal fundamental modulation Waveform generating apparatus, produce the initial basis modulation waveform b of receiving terminal _i.

The perfect autocorrelation sequence generation module 26 of receiving terminal, for generation of the perfect autocorrelation sequence consistent with transmitting terminal , send to receiving terminal Kronecker multiplication module 27.User's centering transmitting terminal is consistent with the perfect autocorrelation sequence of receiving terminal, and the right perfect autocorrelation sequence of different user is identical.

Receiving terminal Kronecker multiplication module 27, for by initial basis modulation waveform b _icarry out Kronecker multiplying with perfect autocorrelation sequence A, obtain final fundamental modulation waveform and send to P-CCSK demodulation module 28, wherein c _iin h element be:

c _i(h)＝a(l)×b _i(m),h＝lN+m,0≤l≤L-1,0≤m≤N-1。

P-CCSK demodulation module 28, for the final fundamental modulation waveform c Received signal strength of reception antenna and receiving terminal Kronecker multiplication module 27 exported _icarry out part-circular periphery circular correlation, thus achieve a butt joint collect mail number demodulation, obtain signaling protein14-3-3 signal to be sent.

By transmitting terminal as shown in Figure 1 with receiving terminal as shown in Figure 2 when communicating, its communication means comprises:

Step 1: user to before starting communication for transmitting terminal and receiving terminal distribute random sequence, the random sequence that each user is right is different.

Step 2: transmitting terminal and receiving terminal are adopted and produced final fundamental modulation waveform in a like fashion respectively, and the generation method of final fundamental modulation waveform is:

1., adopt frequency spectrum perception technical limit spacing external environment condition electromagnetic property, obtain the power spectrum amplitude on different frequency point, Frequency point quantity is designated as N.

2., by the power spectrum amplitude of all Frequency points obtained and presetting power spectrum amplitude threshold compare, build spectrum sequence , wherein S (n), n=0,1 ..., what N-1 represented each Frequency point takies situation, if the n-th power spectrum amplitude is greater than thresholding, represent that this Frequency point is occupied, setting this Frequency point numerical value S (n) is 0; If power spectrum amplitude is less than thresholding, represent that this Frequency point is idle, setting this Frequency point numerical value S (n) is 1.

3. user, is produced to the random phasic serial signal of i $P_i=\{e^{j{m}_i\left(0\right)},e^{j{m}_i\left(1\right)},\·\·\·,e^{j{m}_i(N-1)}\}$ 。In actual applications, random phasic serial signal P _iadopt pseudo-random phase sequences.Produce pseudo-random phase sequences P _iconcrete mode be: first produce PRBS pseudo-random bit sequence, the phase mapper then being inputed to the tap of r position obtains corresponding pseudo-random phase sequences P _i, tap figure place r determines according to actual conditions.Phase mapper can adopt 2 ^r-MPSK modulation or other similar fashion carry out phase mapping.

4. the random phasic serial signal P that 3. the spectrum sequence S, step 2. obtained and step obtain _icarry out by element multiplying, obtain the frequency spectrum random phasic serial signal B of multi-user's transform domain communication system _i=Sdiag (P _i), and by frequency spectrum random phasic serial signal B _icarry out inverse Fourier transform and obtain initial basis modulation waveform $b_i=\{b_i\left(0\right),b_i\left(1\right),\·\·\·,b_i(N-1)\}=\mathrm{IFFT}\left\{B_i\right\}$ , b _iin the n-th element be:

$b_i\left(n\right)=\mathrm{\λ}\underset{k=0}{\overset{N-1}{\mathrm{\Σ}}}S\left(k\right)e^{j{m}_i\left(k\right)}{e}^{\frac{j2\mathrm{\πkn}}{N}}=\mathrm{\λ}\underset{K\∈{\mathrm{\Ω}}^C}{\mathrm{\Σ}}{e}^{j{m}_i\left(k\right)}{e}^{\frac{j2\mathrm{\πkn}}{N}}$

Wherein, λ is the power normalization factor, Ω ^cfor numerical value in spectrum sequence S is the element set of 1.

5., perfect autocorrelation sequence is generated , its length L determines according to actual conditions, each user to all adopting same perfect autocorrelation sequence, and by initial basis modulation waveform b _icarry out Kronecker multiplying with perfect autocorrelation sequence A, obtain final fundamental modulation waveform $c_i=\{c_i\left(0\right),c_i\left(1\right),\·\·\·,c_i(\mathrm{LN}-1)\}$ , c _iin h element be:

c _i(h)＝a(l)×b _i(m),h＝lN+m,0≤l≤L-1,0≤m≤N-1。

Step 3: signal to be sent is adopted final fundamental modulation waveform c by transmitting terminal _icarry out P-CCSK modulation and send through transmitting antenna, the interval ω of circumferential cycle that i-th user is right when modulating _imeet restrictive condition:

${\mathrm{\ω}}_i\∉\underset{j=1,i\≠j}{\overset{U}{\∪}}(-N+{\mathrm{\ω}}_j,N+{\mathrm{\ω}}_j).$

Step 4: receiving terminal obtains Received signal strength by reception antenna, by Received signal strength and final fundamental modulation waveform c _icarry out part-circular periphery circular correlation, thus achieve a butt joint collect mail number demodulation, obtain signaling protein14-3-3 signal to be sent.

Although be described the illustrative embodiment of the present invention above; so that those skilled in the art understand the present invention; but should be clear; the invention is not restricted to the scope of embodiment; to those skilled in the art; as long as various change to limit and in the spirit and scope of the present invention determined, these changes are apparent, and all innovation and creation utilizing the present invention to conceive are all at the row of protection in appended claim.

Claims (6)

1. multi-user's transform domain communication system, comprises multiple communication user pair, and the transmitting terminal that each user is right and receiving terminal include fundamental modulation Waveform generating apparatus, for generation of the i-th, i=1, and 2 ..., the initial basis modulation waveform b that U user is right _iwherein U is that in multi-user's transform domain communication system, communication user is to quantity, and fundamental modulation Waveform generating apparatus comprises: frequency spectrum sensing module, for adopting frequency spectrum perception technical limit spacing external environment condition electromagnetic property, obtain the power spectrum amplitude on different frequency point, Frequency point quantity is designated as N; Frequency spectrum comparison module, for the power spectrum amplitude of all Frequency points obtained and presetting power spectrum amplitude threshold are compared, build spectrum sequence S={S (0), S (1),, S (N-1) }, wherein S (n), n=0,1 ..., what N-1 represented each Frequency point takies situation, if the n-th power spectrum amplitude is greater than thresholding, represent that this Frequency point is occupied, setting this Frequency point numerical value S (n) is 0, if power spectrum amplitude is less than thresholding, represent that this Frequency point is idle, setting this Frequency point numerical value S (n) is 1; Random sequence generator module, for generation of the i-th, i=1,2 ..., the random phasic serial signal P that U user is right _i; Random phasic serial signal maker module, for the random phasic serial signal P that the spectrum sequence S that obtained by frequency spectrum comparison module and random sequence generator module obtain _icarry out by element multiplying, obtain the frequency spectrum random phasic serial signal B of multi-user's transform domain communication system _i=Sdiag (P _i); Inverse Fourier transform module, for frequency spectrum random phasic serial signal B random phasic serial signal maker module exported _icarry out inverse Fourier transform and obtain initial basis modulation waveform b _i; It is characterized in that, described transmitting terminal also comprises:

The perfect autocorrelation sequence generation module of transmitting terminal, for generation of perfect autocorrelation sequence A={a (0), a (1), a (L-1) }, its length L determines according to actual conditions, and perfect autocorrelation sequence A is sent to transmitting terminal Kronecker multiplication module;

Transmitting terminal Kronecker multiplication module, for by initial basis modulation waveform b _icarry out Kronecker multiplying with perfect autocorrelation sequence A, obtain final fundamental modulation waveform c _i={ c _i(0), c _i(1) ..., c _i(LN-1) } and send to P-CCSK modulation module, P-CCSK represents the circumferential cycle modulation of part-circular periphery intercycle, and N represents Frequency point quantity, c _iin h element be:

c _i(h)＝a(l)×b _i(m),h＝lN+m,0≤l≤L-1,0≤m≤N-1；

P-CCSK modulation module, for adopting final fundamental modulation waveform c by signal to be sent _icarry out P-CCSK modulation obtain sending signal and send through transmitting antenna, the interval ω of circumferential cycle of i-th couple of user _imeet restrictive condition:

Described receiving terminal also comprises:

The perfect autocorrelation sequence generation module of receiving terminal, for generation of the perfect autocorrelation sequence A={a (0) consistent with transmitting terminal, a (1) ... a (L-1) }, and perfect autocorrelation sequence A is sent to receiving terminal Kronecker multiplication module;

Receiving terminal Kronecker multiplication module, for by initial basis modulation waveform b _icarry out Kronecker multiplying with perfect autocorrelation sequence A, obtain final fundamental modulation waveform c _i={ c _i(0), c _i(1) ..., c _i} and send to P-CCSK demodulation module, c (LN-1) _iin h element be:

c _i(h)＝a(l)×b _i(m),h＝lN+m,0≤l≤L-1,0≤m≤N-1；

P-CCSK demodulation module, for by the Received signal strength of reception antenna and final fundamental modulation waveform c _icarry out part-circular periphery circular correlation, carry out demodulation to received signal, obtain signaling protein14-3-3 signal to be sent.

2. multi-user's transform domain communication system according to claim 1, is characterized in that, described random phasic serial signal P _iadopt pseudo-random phase sequences, generation method is: first produce PRBS pseudo-random bit sequence, and the phase mapper then being inputed to the tap of r position obtains corresponding pseudo-random phase sequences P _i, tap figure place r determines according to actual conditions.

3. multi-user's transform domain communication system according to claim 2, is characterized in that, described phase mapper adopts 2 ^rphase mapping is carried out in-MPSK modulation.

4. multi-user's transform domain communication method, is characterized in that, comprises the following steps:

(1), in multi-user's transform domain communication system, communication user is designated as U to quantity, the i-th, i=1,2, ..., the transmitting terminal that U user is right and receiving terminal are adopted and are produced final fundamental modulation waveform in a like fashion respectively, and the generation method of final fundamental modulation waveform is:

1.1), initial basis modulation waveform b is produced _i, generation method is: adopt frequency spectrum perception technical limit spacing external environment condition electromagnetic property, obtain the power spectrum amplitude on different frequency point, Frequency point quantity is designated as N; The power spectrum amplitude of all Frequency points obtained and presetting power spectrum amplitude threshold are compared, build spectrum sequence S={S (0), S (1), S (N-1) }, wherein S (n), n=0,1, ..., what N-1 represented each Frequency point takies situation, if the n-th power spectrum amplitude is greater than thresholding, represents that this Frequency point is occupied, setting this Frequency point numerical value S (n) is 0, if power spectrum amplitude is less than thresholding, represent that this Frequency point is idle, setting this Frequency point numerical value S (n) is 1; By spectrum sequence S and random phasic serial signal P _icarry out by element multiplying, obtain the frequency spectrum random phasic serial signal B of multi-user's transform domain communication system _i=Sdiag (P _i), by frequency spectrum random phasic serial signal B _icarry out inverse Fourier transform and obtain initial basis modulation waveform b _i;

1.2), perfect autocorrelation sequence A={a (0) is generated, a (1) ..., a (L-1) }, its length L determines according to actual conditions, and each user is to all adopting same perfect autocorrelation sequence;

1.3), by initial basis modulation waveform b _icarry out Kronecker multiplying with perfect autocorrelation sequence A, obtain final fundamental modulation waveform c _i={ c _i(0), c _i(1) ..., c _i(LN-1) }, N represents Frequency point quantity, c _iin h element be:

c _i(h)＝a(l)×b _i(m),h＝lN+m,0≤l≤L-1,0≤m≤N-1；

(2), signal to be sent is adopted final fundamental modulation waveform c by transmitting terminal _icarry out P-CCSK modulation and send through transmitting antenna, P-CCSK represents the circumferential cycle modulation of part-circular periphery intercycle, the interval ω of circumferential cycle that i-th user is right when modulating _imeet restrictive condition:

(3), receiving terminal obtains Received signal strength by reception antenna, by Received signal strength and final fundamental modulation waveform c _icarry out part-circular periphery circular correlation, thus achieve a butt joint collect mail number demodulation, obtain signaling protein14-3-3 signal to be sent.

5. multi-user's transform domain communication method according to claim 4, is characterized in that, described random phasic serial signal P _iadopt pseudo-random phase sequences, generation method is: first produce PRBS pseudo-random bit sequence, and the phase mapper then being inputed to the tap of r position obtains corresponding pseudo-random phase sequences P _i, tap figure place r determines according to actual conditions.

6. multi-user's transform domain communication method according to claim 5, is characterized in that, described phase mapper adopts 2 ^rphase mapping is carried out in-MPSK modulation.