CN102238128A - Method for self-elimination of inter-subcarrier interference of differential OFDM (orthogonal frequency division multiplexing) system - Google Patents
Method for self-elimination of inter-subcarrier interference of differential OFDM (orthogonal frequency division multiplexing) system Download PDFInfo
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Abstract
The invention discloses a method for self-elimination of inter-subcarrier interference of a differential OFDM (orthogonal frequency division multiplexing) system. In comparison with a primal differential OFDM system, a zero insertion algorithm and a displacement offsetting algorithm are added, wherein the zero insertion algorithm enables adjacent carriers of a subcarrier carrying information to return to zero, so that, the interference of the adjacent carriers on the information carrying carrier is effectively reduced. In a process of transmitting the information to a receiving terminal through a wireless channel, orthogonality cannot be completely formed under influence of Doppler frequency shift caused by carrier synchronous error and movement, and the subcarriers generate mutual interference; and by the displacement offsetting algorithm, the subcarriers carrying the information are amplified, a signal-to-noise ratio of the subcarrier to the adjacent subcarriers is increased, and the adjacent subcarriers are further subtracted, so that the inter-subcarrier interference is effectively eliminated.
Description
Technical field
The present invention relates to the difference ofdm system, particularly a sub-carrier is eliminated the method for disturbing.
Background technology
The OFDM technology is used widely in wideband wireless mobile communication system because of having good antagonism selectivity of channel frequency decline ability.But ofdm system requires strict orthogonal between subcarrier, and frequency shift (FS) is proposed very strict requirement.The generation of frequency shift (FS) comprises the kinetic Doppler frequency shift of carrier synchronization sum of errors, frequency synchronization error can reduce influence by well-designed Carrier Synchronization Algorithm, and Doppler frequency shift causes the time selective fading of channel, particularly under the high-speed motion situation, the ICI that the channel rapid fading causes will cause systematic function to descend fast.
The method that reduces the ICI influence at present includes frequency-domain equilibrium method, time-domain windowed method, frequency offset estimating and compensation method and iteration elimination method, and its deficiency is:
Though wherein frequency-domain equilibrium method and time-domain windowed method have some improvement to the influence of ICI, the outer power of revealing of band increases, and has significantly reduced the utilance of system; Frequency offset estimating and compensation method are under quick fading environment, and it is big that the error of estimation becomes, to the DeGrain that improves of ICI; The iteration elimination method realizes too complicated, and it is also bigger to delay time, need be by complicated matrix operation or FFT conversion after receiving one or more OFDM symbols, and its amount of calculation is very big, is unfavorable for practical application.
Summary of the invention
Purpose of the present invention just provides a kind of difference ofdm system that is used for from eliminating the method for disturbing between subcarrier, and it effectively eliminates interference between the subcarrier by zero insertion algorithm and displacement cancellation algorithms, and has reduced the complexity that system realizes.
The objective of the invention is to realize that by such technical scheme its step is as follows:
1) at transmitting terminal the information of required transmission is modulated, differential coding is gone here and there and is changed;
2) utilize the zero insertion algorithm to handle to the data after the step 1) processing;
3) with step 2) carrying after handling the subcarrier of information carry out Fourier transform, and Cyclic Prefix is inserted in the string conversion again;
4) send information by wireless antenna to receiving terminal;
5) receiving terminal carries out timing synchronization to information, and carrier synchronization is gone here and there and changing, and again the subcarrier that has carried information is carried out Fourier transform;
6) the information utilization displacement cancellation algorithms after the step 5) processing is handled, eliminated the interference between subcarrier;
7) information after step 6) is handled is carried out and is gone here and there conversion, Differential Detection and demodulation.
Further, step 2) the zero insertion algorithm described in is, the information-bearing of required transmission on the subcarrier of odd number or even number, is made zero at even number or odd subcarriers.
Further, the displacement cancellation algorithms in the step 6) is, the subcarrier of carrying signal is amplified, and deducts adjacent two subcarriers that do not carry raw information again.
Owing to adopted technique scheme, the present invention to have following advantage:
Show with contrast simulation that by analysis under the identical prerequisite of spectrum efficiency, when signal to noise ratio during greater than 34dB, the present invention is lower than the iteration elimination method error rate, and complexity significantly reduces.
Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, very, perhaps can obtain instruction from the practice of the present invention in being conspicuous to those skilled in the art to investigating hereinafter.Target of the present invention and other advantages can realize and obtain by following specification and claims.
Description of drawings
Description of drawings of the present invention is as follows.
Fig. 1 is a principle flow chart of the present invention.
Fig. 2 is first kind of analogous diagram of the present invention.
Fig. 3 is second kind of analogous diagram of the present invention.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
A kind of difference ofdm system that is used for is from eliminating the method for disturbing between subcarrier, and its step is as follows:
1) at transmitting terminal the information of required transmission is modulated, differential coding is gone here and there and is changed;
2) utilize the zero insertion algorithm to handle to the data after the step 1) processing;
3) with step 2) carrying after handling the subcarrier of information carry out Fourier transform, and Cyclic Prefix is inserted in the string conversion again;
4) send information by wireless antenna to receiving terminal;
5) receiving terminal carries out timing synchronization to information, and carrier synchronization is gone here and there and changing, and again the subcarrier that has carried information is carried out Fourier transform;
6) the information utilization displacement cancellation algorithms after the step 5) processing is handled, eliminated the interference between subcarrier;
7) information after step 6) is handled is carried out and is gone here and there conversion, Differential Detection and demodulation.
The original relatively difference ofdm system of the present invention has increased step 2) and step 6), step 2) zero insertion algorithm adjacent carrier that the subcarrier of beared information is subjected to be zero, effectively reduce the interference that the beared information carrier wave is subjected to adjacent carrier.Information is sent in the process of receiving terminal by wireless channel, be subjected to the influence of the kinetic Doppler frequency shift of carrier synchronization sum of errors, can't be completed into quadrature, displacement cancellation algorithms by being afraid of in the step 6) to state takes place between the subcarrier to disturb mutually, the subcarrier that has carried information is amplified, subtract the signal to noise ratio that adds this subcarrier and adjacent sub-carrier, deduct adjacent sub-carrier again, effectively eliminated the interference between the subcarrier.
Step 2) the zero insertion algorithm described in is, the information-bearing of required transmission on the subcarrier of odd number or even number, is made zero at even number or odd subcarriers.
Displacement cancellation algorithms in the step 6) is, the subcarrier of carrying signal is amplified, and deducts adjacent two subcarriers that do not carry raw information again.
Fig. 1 is the ofdm system model of ASIZ-SSC-FDD, and establishing sub-carrier number is N, is symbol with the binary bits information mapping at first
,
The mapping symbols of representing n participation differential coding in i the OFDM symbol, wherein
Then will
Carry out differential coding, rule is
,
Initial value be chosen as in the modulation constellation more arbitrarily, by serial to parallel conversion be again
Individual one group,
(
)
Individual allocation of symbols is to even number or odd number road, and nil symbol is assigned to odd number road or even number road, and the ofdm system just as routine transmits then.At receiving terminal, finish synchronously after, the cancellation algorithms of taking to be shifted suppresses the interference of ICI, when Doppler is big, can effectively improve the performance of system from the system of eliminating the ICI algorithm by ASIZ-SSC.Carrier to interference power ratio has improved 15dB at least than conventional system, and the error rate is obviously improved systematic function.Offset through displacement through the signal of FFT again and handle.After advancing Differential Detection, give demodulator.
Its error rate analyzer is as follows:
With the signal of ICI after eliminating
Send into the differential levels detector, the judgement amount of output is:
Wherein
Represent the value of information of n subcarrier after eliminating in i the OFDM symbol,
The expression conjugate operation is without loss of generality, and supposes
, judgment variables
Can be expressed as:
(2)
A=B=0 wherein, C=1, X=
, Y=
By eigenfunction method, try to achieve the error rate such as expression formula (3)
From formula (3) as seen, the error rate is only relevant with the correlation function of detection variable, and the calculating of the error rate is the calculating of the correlation function of detection variable.
(4) wherein
Represent that i OFDM symbol time is the information that t receives, N represents sub-carrier number,
Utilize data dependence, have
In the formula,
Interval between the expression subcarrier,
The expression noise,
Represent in i the OFDM symbol
The mapping symbols of individual participation differential coding.
Abbreviation gets:
(7)
Wherein
Expression white Gaussian noise power.
Through calculating:
(8)
In the formula,
The Doppler frequency domain that expression is maximum,
The symbol duration of expression OFDM.
Same thinking is tried to achieve
(9)
The present invention is carried out emulation, and simulation parameter is set to: the OFDM symbol time
=200us, guard time are at interval
=50us, number of sub carrier wave are 1024, no chnnel coding.On the synchronous basis of transmitting-receiving, to rayleigh fading channel, the bit error rate performance that frequency domain differential demodulation is detected has carried out emulation, and channel model has adopted the SUI4 channel model, analyzes and simulation result such as Fig. 2 Fig. 3.
Fig. 2 is under the SUI4 channel, the radio frequency 300M of supposing the system, and the speed of motion is respectively 1000km/h, 800km/h, 600km/h, maximum doppler frequency are set to 278Hz, 222Hz, 167Hz.As can be seen from the figure, simulation result and theory analysis are very approaching.Ber curve under three kinds of conditions as can be seen, along with the increase of maximum doppler frequency, error performance decreases, but after adding error correction coding, can proper communication.
Fig. 3 is under the SUI4 channel, maximum doppler frequency is set to 222Hz, compare with the frequency domain differential demodulation scheme with based on iteration elimination ICI scheme, the same for guaranteeing two kinds of scheme spectrum efficiencies, the OFDM scheme of ASIZ-SSC-FDD adopts 16DAPSK, iteration elimination ICI scheme adopts QPSK, and simulation result shows that when Eb/N0 is greater than 34dB this scheme is better than iterative scheme.
From implementation complexity, the amount of calculation of the OFDM scheme of ASIZ-SSC-FDD is directly proportional with N, and the amount of calculation of iteration elimination is directly proportional with N2.So the scheme that this paper proposes, implementation complexity is well below the ofdm system based on iteration elimination ICI scheme.
Compare with the ofdm system that ICI eliminates with finish channel estimating based on iterative algorithm, after greater than 34dB, performance is better than the ofdm system of iteration, and along with signal to noise ratio increases, advantage is more obvious.This scheme is when realizing, complexity is low, and it is few to take resource.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the aim and the scope of the technical program, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (3)
1. one kind is used for the difference ofdm system from the method for eliminating to disturb between subcarrier, and its step is as follows:
1) at transmitting terminal the information of required transmission is modulated, differential coding is gone here and there and is changed;
2) utilize the zero insertion algorithm to handle to the data after the step 1) processing;
3) with step 2) carrying after handling the subcarrier of information carry out Fourier transform, and Cyclic Prefix is inserted in the string conversion again;
4) send information by wireless antenna to receiving terminal;
5) receiving terminal carries out timing synchronization to information, and carrier synchronization is gone here and there and changing, and again the subcarrier that has carried information is carried out Fourier transform;
6) the information utilization displacement cancellation algorithms after the step 5) processing is handled, eliminated the interference between subcarrier;
7) information after step 6) is handled is carried out and is gone here and there conversion, Differential Detection and demodulation.
2. the difference ofdm system that is used for as claimed in claim 1 is from eliminating the method for disturbing between subcarrier, it is characterized in that: step 2) described in the zero insertion algorithm be, the information-bearing of required transmission on the subcarrier of odd number or even number, is made zero at even number or odd subcarriers.
3. the difference ofdm system that is used for as claimed in claim 1 is from eliminating the method for disturbing between subcarrier, it is characterized in that: the displacement cancellation algorithms in the step 6) is, the subcarrier of carrying signal is amplified, deduct adjacent two subcarriers that do not carry raw information again.
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Cited By (4)
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| CN104022982A (en) * | 2014-05-09 | 2014-09-03 | 国家电网公司 | ICI self-elimination algorithm with variable coding efficiency |
| CN104836771A (en) * | 2015-05-29 | 2015-08-12 | 桂林电子科技大学 | Partial coherent detection method of fast attenuation channels |
| CN106789808A (en) * | 2016-12-02 | 2017-05-31 | 上海微小卫星工程中心 | The ICI of high spectrum utilization eliminates communication means and system certainly |
| CN114838804A (en) * | 2022-05-09 | 2022-08-02 | 武汉理工大学 | Distributed vibration measurement device and method based on weak grating array and pulse coding |
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| CN101547170A (en) * | 2008-03-27 | 2009-09-30 | 电子科技大学 | Method for estimating time-varying channel parameter suitable for multi-carrier transmission of OFDM |
| US20100034302A1 (en) * | 2007-02-09 | 2010-02-11 | Nxp, B.V. | Method of synchronizing multi-carrier systems and multi-carrier system |
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| US20100034302A1 (en) * | 2007-02-09 | 2010-02-11 | Nxp, B.V. | Method of synchronizing multi-carrier systems and multi-carrier system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104022982A (en) * | 2014-05-09 | 2014-09-03 | 国家电网公司 | ICI self-elimination algorithm with variable coding efficiency |
| CN104836771A (en) * | 2015-05-29 | 2015-08-12 | 桂林电子科技大学 | Partial coherent detection method of fast attenuation channels |
| CN104836771B (en) * | 2015-05-29 | 2017-11-10 | 桂林电子科技大学 | Fading channel partially coherent detection method |
| CN106789808A (en) * | 2016-12-02 | 2017-05-31 | 上海微小卫星工程中心 | The ICI of high spectrum utilization eliminates communication means and system certainly |
| CN106789808B (en) * | 2016-12-02 | 2019-10-01 | 上海微小卫星工程中心 | The ICI of high spectrum utilization eliminates communication means and system certainly |
| CN114838804A (en) * | 2022-05-09 | 2022-08-02 | 武汉理工大学 | Distributed vibration measurement device and method based on weak grating array and pulse coding |
| CN114838804B (en) * | 2022-05-09 | 2023-06-09 | 武汉理工大学 | Distributed vibration measuring device and method based on weak grating array and pulse coding |
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