CN109525532A - Impulse noise suppression method in a kind of ofdm communication system - Google Patents
Impulse noise suppression method in a kind of ofdm communication system Download PDFInfo
- Publication number
- CN109525532A CN109525532A CN201811625971.XA CN201811625971A CN109525532A CN 109525532 A CN109525532 A CN 109525532A CN 201811625971 A CN201811625971 A CN 201811625971A CN 109525532 A CN109525532 A CN 109525532A
- Authority
- CN
- China
- Prior art keywords
- signal
- symbol
- impulse noise
- carried out
- communication system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
- H04L1/0625—Transmitter arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
- H04L1/0631—Receiver arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Discrete Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Noise Elimination (AREA)
Abstract
The present invention provides a kind of impulse noise suppression method of ofdm communication system, comprising: S1: for data symbol is sent, carrying out the space-time block coding of embedded intertexture, obtains two-way and send symbol；S2: IFFT is carried out to two-way transmission symbol respectively and transforms to time domain, and is inserted into protection and guards interval signal on；S3: up-conversion is carried out to two-way time-domain signal obtained in S2 respectively, and is emitted；S4: receiving the signal emitted in S3, obtains receiving signal, carries out down coversion to the reception signal；S5: for the signal after down coversion, clipping is carried out；S6: removing protection interval to the signal after clipping, carries out FFT transform to frequency domain, obtains frequency-region signal.It is embedded in the symbol interlacing method of space-time block coding (STBC), with lesser interleave depth, realizes breaing up for impulse noise interference；Implement effectively to inhibit, improve anti-impulsive noise performance for the impulse noise interference being dispersed in conjunction with the decoded diversity reception effect of impulse noise mitigation and STBC of time domain clipping.
Description
Technical field
The invention belongs to digital communication technology fields, more particularly to the impulse noise mitigation in a kind of ofdm communication system
Method.
Background technique
Impulsive noise is a kind of interference for being difficult to tackle of communication system, is a principal element for leading to communication link fails
One of.Impulsive noise is mainly derived from the factors such as rectification circuit, electric switch, thunder and lightning, automobile spark plug igniter.Pulse is made an uproar
Sound has the duration short, and power is much higher than ambient noise, random the features such as occurring.Shadow of the wireless communication system by impulsive noise
The lower portion for essentially consisting in VHF frequency range and uhf band is rung, and the average duration (burst-length) of impulsive noise is small
In 250us, origination interval is greater than tens of ms.In power-line carrier communication system, the interference of impulsive noise is even more serious, is divided into
Aperiodicity impulsive noise and periodic pulse noise.Recurrent pulse noise is that one of narrowband powerline systems are mainly made an uproar
Sound, mainly as produced by the Switching Power Supply of household electrical appliance etc., generating period is half power frequency period (50Hz power frequency, half cycle
Phase is 10ms).Meanwhile burst-length is very long (0.833ms~2.5ms), thoroughly disturbs an even several OFDM symbols
Period.On the other hand, the high 30~50dB of power ratio ambient noise of impulsive noise.Therefore, such recurrent pulse noise burst length
Degree length, accounting is big, and interference is strong, and receiver inhibits difficulty big, seriously affects communication reliability.
In order to better against frequency selective fading and impulse noise interference, OFDM (Orthogonal Frequency
Division Multiplexing, orthogonal frequency division multiplexing) technology be extensively studied and be applied to DAB (digital audio broadcasting),
The wireless communication systems such as DVB (digital video broadcasting), WLAN (WLAN), LTE (long term evolution system) mobile communication with
And in IEEE P1901 power-line carrier communication system.Relative to single-carrier technology, the OFDM of multicarrier is to the lower arteries and veins of power
Noise is rushed with natural resistivity.This is because OFDM receiver is by the way that signal progress FFT transform is received, pulse is made an uproar
Sound is diffused into the subcarrier in frequency domain of entire OFDM symbol, reduces influence of the impulse noise interference to demodulation.But another
Aspect, if the power of impulsive noise is very high, and is diffused into entire OFDM symbol, so that the carrier-to-noise ratio of each subcarrier is tight
Deteriorate again, will lead to serious symbol judgement mistake instead.
Currently, the main method of impulse noise mitigation has Time-Domain Nonlinear inhibition, the inhibition side FEC to interweave with FEC coding
Case etc..Time-Domain Nonlinear inhibits, by carrying out clipping (Clipping) either zero setting (Blanking) or two to reception signal
The combination of person slows down influence of the impulsive noise to demodulation performance.Since such method can introduce extra interference, bring performance
Improve very limited.FEC suppressing method is to entangle by interweaving come Decentralized Impulse noise jamming, and by FEC decoding algorithm to error code
Mistake influences to resist impulsive noise bring.The method has stronger dependence to the environment of impulsive noise, especially in arteries and veins
It rushes that noise power is big, under the long environment of burst-length, needs to increase the depth and error correcting capability of intertexture, improving performance and calculation
Difficult compromise is carried out between method implementation complexity.
The disclosure of background above technology contents is only used for auxiliary and understands design and technical solution of the invention, not necessarily
The prior art for belonging to present patent application, no tangible proof show above content present patent application the applying date
In disclosed situation, above-mentioned background technique should not be taken to the novelty and creativeness of evaluation the application.
Summary of the invention
The purpose of the present invention is to solve impulse noise interference in the prior art, especially power are big, burst-length is long
Impulse noise interference the problem of, propose impulse noise suppression method in a kind of ofdm communication system.
In order to solve the above technical problems, the present invention proposes a kind of impulse noise suppression method of ofdm communication system, comprising:
S1, it is directed to transmission data symbol, carries out the space-time block coding of embedded intertexture, obtained two-way and send symbol；S2, symbol is sent to two-way
IFFT is carried out number respectively and transforms to time domain, and is inserted into protection and is guarded interval signal on；S3, two-way time-domain signal obtained in S2 is divided
Not carry out up-conversion, and emitted；S4, the signal emitted in S3 is received, obtains receiving signal, the reception is believed
Number carry out down coversion；S5, for the signal after down coversion, carry out clipping；S6, protection interval is removed to the signal after clipping, into
Row FFT transform obtains frequency-region signal to frequency domain；S7, frequency-region signal solve it is compound；S8, the signal for solution after compound, into
The decoding of row space-time block coding.
Compared with prior art, the beneficial effects of the present invention are as follows: being embedded in the symbol interleaving side of space-time block coding (STBC)
Method realizes breaing up for impulse noise interference with lesser interleave depth；In conjunction with the impulse noise mitigation and STBC of time domain clipping
Decoded diversity reception effect is implemented effectively to inhibit, improves anti-impulsive noise for the impulse noise interference being dispersed
Energy.
Detailed description of the invention
Fig. 1 is the composition schematic diagram of STBC encoder；
Fig. 2 is that the embedded intertexture STBC encoder of the embodiment of the present invention constitutes schematic diagram；
Fig. 3 is the signal schematic representation that the embedded intertexture STBC of the embodiment of the present invention is encoded；
Fig. 4 is the system block diagram of the embodiment of the present invention；
Fig. 5 is the compound block diagram of solution of the embodiment of the present invention；
Fig. 6 is the embedded intertexture and the compound signal schematic representation of solution of the embodiment of the present invention；
Fig. 7 is the embedded intertexture and solution another schematic diagram of composite signal of the embodiment of the present invention.
Specific embodiment
The invention will be further described with embodiment with reference to the accompanying drawing.
Fig. 1 show STBC (Space Time Block Code, space-time block coding) encoder and constitutes schematic diagram.In figure
Show double transmitting antenna applications with full rate, full-diversity and can make for the Alamouti scheme being widely adopted
The features such as with simple linear codec algorithm.Input data symbol is divided into odd number branch and even number branch by serial to parallel conversion 101
Road.Two branches carry out time domain in signal compound 102 and airspace recombinates, and obtain the data symbol sequence of two antennas.Odd number/idol
Number branch is directly multiplexed, and obtains the symbol sebolic addressing s of antenna 1*1,s2,s*3,s4,s*5,s6,....Even order branch conjugation takes
Instead, then with the conjugation of odd number branch it is multiplexed, obtains the symbol sebolic addressing-s of antenna 2*2,s1,-s*4,s3,-s*6,s5,...。
Demultiplex control signal 103, is overturn according to symbol period.
The embedded intertexture STBC encoder that Fig. 2 show the embodiment of the present invention constitutes schematic diagram.Firstly, in impulsive noise mould
Under formula 2, sending symbol sebolic addressing in repeating portion 201, symbol is repeated once one by one, can regard s1=s2, s3=s4 as after repeating, with
This analogizes.Under impulsive noise mode 1, repeating portion 201 is bypassed, i.e., is repeated without symbol.For the letter from repeating portion 201
Number, input signal is divided into odd number branch and even number branch by serial to parallel conversion 202.Odd number branch passes through interleaver 203, even number branch
Pass through interleaver 204.The output of interleaver 203,204 is connected to signal composite part 205, carries out time domain/airspace signal recombination, obtains
To the symbol sebolic addressing 206,207 of two antennas.Multiplexing is controlled by demultiplex control signal 208.
The signal schematic representation of the embedded intertexture STBC coding of the embodiment of the present invention shown in Fig. 3, further illustrates that the present invention is real
Apply the STBC coding principle of example.Interleaver uses the block interleaving mode of n*2, i.e. interleaver is arranged with n row 2.Showing in Fig. 3
Example, n=3.The step of interleaving algorithm includes: that A. data symbol is written column-wise as storage unit；B. it after all writing completely, then reads line by line
Data symbol；C. after all running through, the primary operation that interweaves is completed, A is repeated, carries out intertexture operation next time.Multiplexing control
System 208 is overturn according to 2n symbol period (that is, the symbol numbers once to interweave), and antenna 1 has selected odd number branch first,
Export s*1,s*7,s*3 ..., demultiplex control signal overturning after export s2, s8, s4 ....Antenna 2 has selected even number branch first
Road, output-s*2,-s*8,-s*4 ..., demultiplex control signal overturning after export s1, s7, s3 ....Parameter n is dashed forward by impulsive noise
Length is sent out to determine (referring to formula (1)):
Ceil () is the function that rounds up, T in formulaIMFor burst-length, T is symbol time.
Fig. 4 is the system block diagram of the embodiment of the present invention.401,207 connection 402 of the connection of STBC encoder output 206.
For input signal 401,402, IFFT Department 403 carries out IFFT transformation and converts the signal into time domain, realizes OFDM modulation.For next
From the signal of IFFT Department 403, GI insertion department 405 insertion guard interval signal on, and be connected to the portion TX 407 carry out up-conversion after, send
Enter channel to be emitted.In channel part 409, antenna 1 is multiplied by channel impulse response h1, and antenna 2 is multiplied by channel impulse response h2；?
Impulsive noise z1 is added in channel part 411, antenna 1, and impulsive noise z2 is added in antenna 2.Receive merge 413 pairs of two aerial signals into
Row is added, and ambient noise w is added 414.
For the reception signal for carrying out self-channel, the portion RX 417 carries out down coversion, and output is connected to limiter 418 and is fought
The amplitude limiting processing of impulsive noise.For the signal from limiter 418, after GI removing 419 removes protection interval, in the portion FFT 420
Carry out FFT transform, frequency domain of remapping back.420 output signal of the portion FFT is connected to solution compound 421, restores the symbol sequence being disturbed
Column.For the signal from solution compound 421, STBC decoder 422 carries out STBC decoding, restores to send symbol sebolic addressing.Channel is estimated
Meter 423 estimates the channel impulse response of two antennas, and is output to STBC decoder 422.For the time domain from the portion RX 417
Signal, impulsive noise estimator 424 estimate the burst-length T of impulsive noiseIMAnd impulse noise power IIMAnd pulse
Moment occurs for noise.Impulsive noise estimator 424 is connected to clipping portion 418, to control clipping portion；And if only if pulse
When noise occurs, clipping portion carries out clipping to signal, with impulse noise mitigation.From 424 burst-length TIMAnd pulse is made an uproar
Acoustical power IIMParameter is output to mode control unit 425, determines system model.Firstly, according to formula (1), burst-length
TIMDetermine interleave depth n.In addition, burst-length TIMAnd impulse noise power IIMDetermine impulsive noise mode.Work as TIM<T/
TH1 or IIM< TH2 shows that burst-length is sufficiently small or the power of impulsive noise is sufficiently small, is determined as impulsive noise mode 1；
Otherwise, it is determined that being impulsive noise mode 2.As previously mentioned, being determined as under impulsive noise mode 2, need to carry out weight to transmission symbol
It is multiple, to enhance the resistivity to impulse noise interference.The thresholding TH1 and TH2 can pass through the analysis of communication link performance
Or emulation is to determine.
The compound block diagram of the solution of Fig. 5 embodiment of the present invention.For input signal, serial to parallel conversion 501 input signal be divided into it is odd,
Even two branches.Deinterleaver 502 is deinterleaved odd number tributary signal, and 503 dual numbers tributary signal of deinterleaver carries out
It deinterleaves, deinterleaver depth n*2 (example n=3 in Fig. 5).It when deinterleaving, is written column-wise as, after writing completely, then reads line by line first
Out.For odd, even tributary signal, multiplexing unit 503 carries out signal compound.Multiplexing control 504 is according to 2n symbol period (that is, one
The symbol numbers of secondary intertexture) it is overturn.
Fig. 6 is the embedded intertexture and the compound signal schematic representation of solution of the embodiment of the present invention, implementation of the present invention is explained further
The effect of example.Since symbol interleaving is limited between OFDM symbol, in order to illustrate simplicity, shown in Fig. 6 completely with send, it is received
Frequency-region signal example, but the effect of the embodiment of the present invention is also shown enough.On the other hand, Fig. 6 is primarily to display pulse is made an uproar
Effect brought by sound diffusion, therefore assume channel impulse response h1=h2=1.In addition, impulse noise burst shown in Fig. 6
Length TIM=2nT is just the length of an interleaving block, and n=3.As shown, all symbols of first interleaving block are all
Impulsive noise pollutes (disturbed), such as the diagonal line hatches symbol in figure.Compound rule is solved according to figure 5, is demultiplexed
Symbol sebolic addressing yi after conjunction will be fed into STBC decoder 422.According to Alamouti STBC decoding algorithm, the letter of two symbols composition
It is number right, for example, y1 and y2, while it being sent into STBC decoding, and obtain sending symbol s1, the estimated value of s2 completes signal decoding.Such as
Shown in Fig. 6, it is sent into the signal pair of STBC decoder, pollution of only one symbol by impulsive noise, another symbol is then
Completely from the interference of impulsive noise.It is acted on using the decoded diversity reception of STBC, is reasonably resistant to impulse noise interference.It is another
Aspect, when impulse noise interference is too violent, system enters impulsive noise mode 2.Under mode 2, sends symbol sebolic addressing and carry out
It repeats, i.e. s1=s2, s3=s4, and so on.Therefore, y2=h1*s2+h2*s1=h1*s1+h2*s1=(h1+h2) * s1,
Restore to send symbol using that from the symbol y2 of impulse noise interference, can decode completely, has altogether dispensed with impulse noise interference
Influence, greatly improve anti-impulsive noise performance.
The embedded intertexture and solution another schematic diagram of composite signal of Fig. 7 embodiment of the present invention, are as shown in the figure n=1, and dash forward
Send out length TIMLess than the situation of a symbol lengths.Work as TIMWhen < T/TH1, system work is in impulsive noise mode 1, STBC decoding
Device is according to normal mode decoder.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those skilled in the art to which the present invention belongs, it is not taking off
Under the premise of from present inventive concept, several equivalent substitute or obvious modifications can also be made, and performance or use is identical, all answered
When being considered as belonging to protection scope of the present invention.
Claims (10)
1. impulse noise suppression method in a kind of ofdm communication system, which comprises the steps of:
S1: for data symbol is sent, the space-time block coding of embedded intertexture is carried out, two-way is obtained and sends symbol；
S2: IFFT is carried out to two-way transmission symbol respectively and transforms to time domain, and is inserted into protection and guards interval signal on；
S3: up-conversion is carried out to two-way time-domain signal obtained in S2 respectively, and is emitted；
S4: receiving the signal emitted in S3, obtains receiving signal, carries out down coversion to the reception signal；
S5: for the signal after down coversion, clipping is carried out, in time domain impulse noise mitigation；
S6: removing protection interval to the signal after clipping, carries out FFT transform to frequency domain, obtains frequency-region signal；
S7: frequency-region signal solve compound；
S8: for signal of the solution after compound, the decoding of space-time block coding is carried out.
2. impulse noise suppression method in ofdm communication system according to claim 1, which is characterized in that further include:
S9: for the output signal of down coversion, impulsive noise estimation is carried out, the characteristic value of impulsive noise is obtained.
3. impulse noise suppression method in ofdm communication system according to claim 1, which is characterized in that further include:
S10: for the characteristic value of the impulsive noise estimation of input, impulsive noise mode is determined.
4. impulse noise suppression method in ofdm communication system according to claim 1, which is characterized in that further include:
S11: carrying out channel estimation and obtain channel estimation value, is supplied to STBC decoding.
5. impulse noise suppression method in ofdm communication system according to claim 1, which is characterized in that step S1 packet
It includes:
S101: repeat or without repeating to symbol sebolic addressing is sent；
S102: serial to parallel conversion is carried out to symbol sebolic addressing is sent, resolves into odd number, even number branch；
S103: n*2 block interleaving is carried out to odd number branch symbol sebolic addressing；
S104: dual numbers branch symbol sebolic addressing carries out n*2 block interleaving；
The demultiplex control signal of S105:2n symbol period overturning, synthesizes odd number, even number branch symbol sebolic addressing, generates disorderly
The STBC coded identification sequence of sequence.
6. impulse noise suppression method in ofdm communication system according to claim 1, which is characterized in that step S7 packet
It includes:
S71: serial to parallel conversion is carried out to symbol sebolic addressing, resolves into odd number, even number branch；
S72: the deinterleaving of n*2 block is carried out to odd number branch symbol sebolic addressing；
S73: dual numbers branch symbol sebolic addressing carries out the deinterleaving of n*2 block；
The demultiplex control signal of S74:2n symbol period overturning, synthesizes odd number, even number branch symbol sebolic addressing, restores original
The STBC coded identification sequence of sequence.
7. impulse noise suppression method in ofdm communication system according to claim 1, which is characterized in that step S9 be into
The estimation of row impulsive noise, estimates impulsive noise feature, including burst-length TIMWith impulse noise power IIMAnd pulse is made an uproar
The generation moment of sound.
8. impulse noise suppression method in ofdm communication system according to claim 1, which is characterized in that step S10 is
Impulsive noise mode determines, works as TIM< T/TH1 or IIM< TH2 is determined as impulsive noise mode 1；Otherwise, it is determined that making an uproar for pulse
Sound pattern 2.
9. impulse noise suppression method in ofdm communication system according to claim 1, which is characterized in that step S8 is arteries and veins
It rushes under noise pattern 1, carries out STBC decoding；For the impulse noise interference broken up, by limiting in time domain impulsive noise
Width and the decoded diversity effect of STBC, are interfered with impulse noise mitigation；Under impulsive noise mode 2, using completely from pulse
The reception symbol of noise jamming restores to send symbol.
10. a kind of computer readable storage medium is stored with the computer program being used in combination with calculating equipment, the calculating
Machine program can be executed by processor to realize any one of claim 1 to 9 the method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811625971.XA CN109525532B (en) | 2018-12-28 | 2018-12-28 | Impulse noise suppression method in OFDM communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811625971.XA CN109525532B (en) | 2018-12-28 | 2018-12-28 | Impulse noise suppression method in OFDM communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109525532A true CN109525532A (en) | 2019-03-26 |
| CN109525532B CN109525532B (en) | 2021-07-13 |
Family
ID=65798113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811625971.XA Active CN109525532B (en) | 2018-12-28 | 2018-12-28 | Impulse noise suppression method in OFDM communication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109525532B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101043241A (en) * | 2006-03-20 | 2007-09-26 | 华为技术有限公司 | Multi-antenna communication method and system |
| CN101150343A (en) * | 2006-09-20 | 2008-03-26 | 华为技术有限公司 | A MIMO mobile communication method and system |
| US20080101493A1 (en) * | 2006-10-27 | 2008-05-01 | Samsung Electronics Co., Ltd. | Method and system for computing a spatial spreading matrix for space-time coding in wireless communication systems |
| CN101237306A (en) * | 2008-03-05 | 2008-08-06 | 中科院嘉兴中心微系统所分中心 | Broadband wireless sensor network transmission scheme based on collaborative communication of amplification forward single node |
| KR20100030369A (en) * | 2008-09-10 | 2010-03-18 | 연세대학교 산학협력단 | Apparatus and method for transmitting and receiving signal using stbc or sfbc |
| US20110142153A1 (en) * | 2009-12-15 | 2011-06-16 | Electronics And Telecommunications Research Institute | Multiple-input multiple-output system, receiving apparatus and method of receiving signals |
| CN103414677A (en) * | 2013-07-30 | 2013-11-27 | 中国民航大学 | Orthogonal frequency division multiplexing transmission method with joint orthogonal transformation interweaved with signals |
| CN105207966A (en) * | 2015-08-10 | 2015-12-30 | 中国民航大学 | Compressed sensing PIE (Pulse Interference Elimination) system based on space-frequency coding |
| CN106506431A (en) * | 2016-12-27 | 2017-03-15 | 哈尔滨工业大学 | The method that joint peak-to-average force ratio suppresses the ofdm system pulse interference suppression extinguished with pulse |
-
2018
- 2018-12-28 CN CN201811625971.XA patent/CN109525532B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101043241A (en) * | 2006-03-20 | 2007-09-26 | 华为技术有限公司 | Multi-antenna communication method and system |
| CN101150343A (en) * | 2006-09-20 | 2008-03-26 | 华为技术有限公司 | A MIMO mobile communication method and system |
| US20080101493A1 (en) * | 2006-10-27 | 2008-05-01 | Samsung Electronics Co., Ltd. | Method and system for computing a spatial spreading matrix for space-time coding in wireless communication systems |
| CN101237306A (en) * | 2008-03-05 | 2008-08-06 | 中科院嘉兴中心微系统所分中心 | Broadband wireless sensor network transmission scheme based on collaborative communication of amplification forward single node |
| KR20100030369A (en) * | 2008-09-10 | 2010-03-18 | 연세대학교 산학협력단 | Apparatus and method for transmitting and receiving signal using stbc or sfbc |
| US20110142153A1 (en) * | 2009-12-15 | 2011-06-16 | Electronics And Telecommunications Research Institute | Multiple-input multiple-output system, receiving apparatus and method of receiving signals |
| CN103414677A (en) * | 2013-07-30 | 2013-11-27 | 中国民航大学 | Orthogonal frequency division multiplexing transmission method with joint orthogonal transformation interweaved with signals |
| CN105207966A (en) * | 2015-08-10 | 2015-12-30 | 中国民航大学 | Compressed sensing PIE (Pulse Interference Elimination) system based on space-frequency coding |
| CN106506431A (en) * | 2016-12-27 | 2017-03-15 | 哈尔滨工业大学 | The method that joint peak-to-average force ratio suppresses the ofdm system pulse interference suppression extinguished with pulse |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109525532B (en) | 2021-07-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Patidar et al. | Performance analysis of WiMAX 802.16 e physical layer model | |
| Ghannam et al. | Signal coding and interference cancellation of spectrally efficient FDM systems for 5G cellular networks | |
| Ogale et al. | Performance evaluation of MIMO-OFDM system using Matlab® Simulink with real time image input | |
| CN109525532A (en) | Impulse noise suppression method in a kind of ofdm communication system | |
| Astawa et al. | Performance analysis of MIMO-OFDM using convolution codes with QAM modulation | |
| El Maammar et al. | Performances concatenated LDPC based STBC-OFDM system and MRC receivers | |
| Adebisi et al. | Space-frequency and space-time-frequency M3FSK for indoor multiwire communications | |
| Quan et al. | A low cost STBC-OFDM system with improved reliability for power line communications | |
| Haque et al. | Performance evaluation of a wireless Orthogonal Frequency Division Multiplexing system under various concatenated FEC channel-coding schemes | |
| KR101346423B1 (en) | Method for transmitting data in multiple antenna system | |
| Zerrouki et al. | A physical layer simulation for WiMAX MIMO-OFDM system: Throughput comparison between 2× 2 STBC and 2× 2 V-BLAST in Rayleigh fading channel | |
| Rao et al. | Performance analysis of MIMO-OFDM for multiple antennas | |
| Dahiya et al. | Turbo coded MIMO-OFDM systems | |
| Sanghoi et al. | Analysis of WIMAX physical layer using spatial diversity under different fading channels | |
| Hadi et al. | Performance comparison of STBC-FT based OFDM wireless communication system using M-QAM and M-PSK modulation techniques | |
| Adebisi et al. | Multi-emitting/multi-receiving points MMFSK for power-line communications | |
| Blakit et al. | Performance analysis of QOSTBC-OFDM system based on FEC codes | |
| Singh et al. | A Performance Analysis of Modified LDPC Based CP-OFDM IDMA on Different Window Size FFT for Next Generation Communication System | |
| Shwetha et al. | The performance analysis of MIMO OFDM system with different M-QAM modulation and Convolution channel coding | |
| Huang et al. | A modified Low PAPR space-frequency block coding scheme for SC-FDMA | |
| Alam et al. | Performance Analysis of a Concatenated LDPC Coded Alamouti Based STBC-OFDM System on Text Message Transmission | |
| KR100962328B1 (en) | Apparatus and method for Transmitting and Receiving signal using STBC or SFBC | |
| CN105516046A (en) | Background noise suppression method for OFDM (Orthogonal Frequency Division Multiplexing) carrier communication module of intelligent meter reading system | |
| CN105516035B (en) | Physical-layer network coding method based on Gaussian waveform | |
| Fu et al. | MIMO-OFDM scheme using ApFFT over 3GPP SCM channels |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |