CN107147605A - The OFDM means of communication and system that a kind of wide and narrow strip is combined - Google Patents
The OFDM means of communication and system that a kind of wide and narrow strip is combined Download PDFInfo
- Publication number
- CN107147605A CN107147605A CN201710293774.1A CN201710293774A CN107147605A CN 107147605 A CN107147605 A CN 107147605A CN 201710293774 A CN201710293774 A CN 201710293774A CN 107147605 A CN107147605 A CN 107147605A
- Authority
- CN
- China
- Prior art keywords
- channel
- ofdm
- narrow
- noise
- communication
- 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.)
- Pending
Links
- 230000006854 communication Effects 0.000 title claims abstract description 77
- 238000004891 communication Methods 0.000 title claims abstract description 76
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims description 23
- 230000007246 mechanism Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 4
- 230000007812 deficiency Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 7
- 206010061876 Obstruction Diseases 0.000 description 4
- 125000004122 cyclic group Chemical group 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
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
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
-
- 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
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2681—Details of algorithms characterised by constraints
- H04L27/2688—Resistance to perturbation, e.g. noise, interference or fading
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
Abstract
The present invention provides the OFDM means of communication that a kind of wide and narrow strip is combined, the step of receiving terminal includes analog-to-digital conversion, FFT steps and decoding step；It is additionally included in after FFT steps and the signal intensity of every sub-channels is detected；Acknowledgement channel is idle after decoding step and the then channel of channel signal strength by force carries high score amount noisy communication channel；Filtered out in described narrow-band noise filter step with high component noisy communication channel.If the present invention, which is a kind of receiving terminal in OFDM communication systems, detects that some channel is strong noise channel, the method for just selecting suitable narrow band filter to filter out the frequency of the channel, to overcome certain point noise amplitude fortune to exceed signal amplitude, A/D samplings are because of noise close to saturation, and the sampling error of signal can have a strong impact on the deficiency of communication.
Description
Technical field
The present invention relates to field of wireless communication, more particularly to a kind of OFDM communication systems anti-disturbance method is a kind of wide
The OFDM means of communication and system that arrowband is combined.
Background technology
OFDM (Orthogonal Frequency Division Multiplexing) is orthogonal frequency division multiplexi.
OFDM technology can carry out multiple sub-channel parallel communications in very wide bandwidth, relative to traditional narrowband systems, OFDM quilts
It is considered a kind of broadband communications technology.The advantage of this technology is the orthogonal frequency characteristic for making full use of subchannel, can be quilt
Noise pollution or the too big subchannel that decays are filtered out, and utilize remaining channel to ensure to communicate.One kind of OFDM multi-carrier modulations.
Its main thought is：Some orthogonal sub-channels are broken a channel into, high-speed data signal is converted into parallel low speed subdata
Stream, is modulated on every sub-channels and is transmitted.Orthogonal signalling can be by being separated, so in receiving terminal using correlation technique
It can reduce and interfere ICI between subchannel.Signal bandwidth on per sub-channels is less than the correlation bandwidth of channel, because
Flatness decline can be regarded as on this every sub-channels, so as to eliminate intersymbol interference.And due to every sub-channels
Bandwidth be only former channel width sub-fraction, channel equalization becomes relatively easy.
It is as shown in Figure 1 using the communication system of OFDM technology：The data signal of transmitting terminal is encoded-digital modulation-string
And convert-IFFT- parallel serial conversions-plus cyclic prefix-digital-to-analogue conversion --- channel --- analog-to-digital conversion-goes cyclic prefix-string to become
Change the data signal output that-FFT- parallel-serial conversions-digital demodulation-decoding forms receiving terminal.IFFT (Inverse Fast above
Fourier Transform) it is inverse transformation in quick Fu, FFT (Fast Fourier Transform) is converted in quick Fu.
But real system can be limited when realizing by the precision of Analog-digital Converter A/D (analog-to-digital conversion) device, shadow
Ring communication effect.Under current technical conditions, the A/D device digits of usual ofdm system are 10-14bit, there is a certain amount
Error.In extreme circumstances, such as a certain frequency noise amplitude exceeds well over signal amplitude, and A/D samplings are close full because of noise
With the sampling error of signal can have a strong impact on communication.Such case is wireless in power line communication system or disturbed military affairs
It is a kind of common blocking mechanism under system.
The content of the invention
The present invention for current ofdm system can due to certain point noise amplitude fortune exceed signal amplitude, A/D sampling because
For noise close to saturation, the sampling error of signal can have a strong impact on communication not enough, and there is provided the OFDM that a kind of wide and narrow strip is combined
The means of communication and communication system.
The technical scheme is that：The OFDM means of communication that a kind of wide and narrow strip is combined, include analog-to-digital conversion in receiving terminal
The step of, FFT steps and decoding step；Also include the step of the step of noise jamming is recognized and assessed, narrow-band noise filter；
The step of described noise jamming identification and assessment, includes：
Signal intensity to every sub-channels after FFT steps is detected；
Acknowledgement channel is idle after decoding step and the then channel of channel signal strength by force carries high score amount noisy communication channel；
Filtered out in described narrow-band noise filter step with high component noisy communication channel.
If the present invention, which is a kind of receiving terminal in OFDM communication systems, detects that some channel is strong noise channel, just select
The method that suitable narrow band filter filters out the frequency of the channel, to overcome certain point noise amplitude fortune to exceed signal amplitude, A/D
Sampling is because of noise close to saturation, and the sampling error of signal can have a strong impact on the deficiency of communication.
Further, in the OFDM means of communication that above-mentioned wide and narrow strip is combined：Also include sending logical to receiving terminal transmitting terminal
Know and allow transmitting terminal not use the step of high component noisy communication channel sends signal.
Further, in the OFDM means of communication that above-mentioned wide and narrow strip is combined：In described narrow-band noise filter step：
Wave filter is set according to the width with high component noisy communication channel and position：If high component noisy communication channel is in whole OFDM channels
Low frequency part, then using high-pass filter；If high component noisy communication channel is used in the HFS of whole OFDM channels
High-pass filter；If high component noisy communication channel is in the intermediate-frequency section of whole OFDM channels, using high band trap.
The present invention also provides the OFDM communication systems that a kind of wide and narrow strip is combined, and the system includes reception device, and described connects
Receiving apparatus includes analog-digital converter, FFT devices and decoder, in addition to noise jamming identification and apparatus for evaluating, narrow-band filtering
Device, filtering feeding control device；
Described noise jamming identification apparatus for evaluating includes detecting each channel signal strength of described FFT devices output
Detection means, to decoder output carry out judge whether be idle channel decision mechanism, with detection means and judgement machine
The connected processor of structure, described processor determines that the strong idle channel of signal intensity is high component noisy communication channel；
The narrow-band filter means that filtering feeding control device control input filters out high component noisy communication channel are added to described modulus
Before converter.
In the OFDM communication systems of the present invention, filtered if having detected channel and being strong noise channel using narrow band filter
Remove.
Further, in the OFDM communication systems that above-mentioned wide and narrow strip is combined：Also include notifying high component noisy communication channel
To the notice device of receiving terminal.
Further, in the OFDM communication systems that above-mentioned wide and narrow strip is combined：Described narrow-band filter means include using
Self calibration RC wave filters, the adjustable low pass of SCF structure, high pass, band resistance, bandpass filter.
The present invention is described in more detail with reference to specific embodiment.
Brief description of the drawings
Fig. 1 is OFDM communication system block diagrams.
Fig. 2 is the OFDM communication system theory diagrams that wide and narrow strip of the present invention is combined.
Fig. 3 is the schematic diagram for the OFDM communication system receivers that wide and narrow strip of the present invention is combined.
Fig. 4 is the OFDM communication system receiver noise disturbance ecologies appraisal agency schematic diagram that wide and narrow strip of the present invention is combined.
Embodiment
Embodiment 1, as shown in Figures 2 and 3, the present embodiment are the OFDM communication systems that a kind of wide and narrow strip is combined, in broadband
On the basis of ofdm system, using the narrow-band filtering mechanism of simulation, the noise signal for causing obstruction is filtered out outside band, to lose band
A width of cost, it is ensured that the accessibility of communication.Due to simulation narrow-band filtering, the precipitous filtering characteristic of especially multistage narrow-band filtering,
Most noise component(s)s can be isolated, influence of a small amount of noise left to ofdm system becomes very low or even can ignored.
Different using the mechanism of orthogonal property filtration inefficiencies channel from OFDM, the present embodiment mainly utilizes narrow-band filtering measure, filters out height
The barrage noise of component, solves AD subsystems because precision is limited, the obstructing problem under high component noise.
The reception device of wideband OFDM system include analog-digital converter, go cyclic prefix device, serial-parallel converter,
FFT devices, parallel-to-serial converter, digital demodulator and the even upper increase noise jamming identification of decoder and apparatus for evaluating, arrowband
Filter, filtering feeding control device.
Wherein：Noise jamming identification apparatus for evaluating is as shown in Figure 4, it is possible to use the intrinsic FFT Fourier of OFDM technology becomes
The system of changing planes, recognizes high component narrow-band noise frequency range, and assess which noise is likely to result in obstruction.Noise jamming recognizes apparatus for evaluating
The detection means that is detected including each channel signal strength to described FFT devices output, the output progress to decoder
Judge whether the processor for being the decision mechanism of idle channel, being connected with detection means and decision mechanism, processor determines signal
The strong idle channel of intensity is high component noisy communication channel；The function of noise jamming identification apparatus for evaluating is exactly to detect some free time
Channel is strong noise channel, determines that the main stem needs to filter out.
In the noise jamming identification apparatus for evaluating of the present embodiment：When the amplitude of noise is near or above the maximum defeated of A/D
Enter amplitude, cause AGC automatic growth controls needs to produce negative gain, system has the risk of obstruction.
The intrinsic FFT Fourier transformations mechanism of OFDM technology can recognize the signal intensity of each subchannel, work as acknowledgement channel
When idle, the channel with high component noise can be identified.
The narrow-band filter means that filtering feeding control device control input filters out high component noisy communication channel are added to modulus turn
Before parallel operation.
In the present embodiment, narrow-band filter means are also referred to as narrow band filter, are arranged on communication system receiving terminal low noise amplifier
Afterwards, before weighted-voltage D/A converter, the channel of strong noise is directly filtered out, self calibration RC wave filters, switch-capacitor filtering can be used
Device etc., builds adjustable low pass, and high pass, band hinders, and the analog filter such as band logical realizes multistage cascade.
Position and bandwidth of the feeding control device according to barrage noise are filtered, the input of analog filtering subsystem is controlled.When
When narrow-band barrage noise appears in the centre of signal passband, using bandstop filter, noise band is decayed using stopband characteristic
Fall.When narrow-band barrage noise appears in signal passband side or two ends, according to circumstances using high pass, low pass or bandpass filtering
Device, passes through signal, noise of decaying.
In the present embodiment, the characteristics of being communicated using many subchannels of OFDM, although also shielded while filtering out barrage noise
Part subchannel, but overall communication effect is ensured, it is to avoid the caused communication distance of obstruction declines to a great extent.
The present embodiment is the OFDM communication systems that a kind of wide and narrow strip in power line carrier communication is combined, as shown in Fig. 2
OFDM MODEM use G3 PLC chip ATMEL ATPL250A, realize the microprocessor system choosing that noise jamming identification is assessed
With ST companies STM32 series A RM processors, narrow-band filtering subsystem selects MAXIM companies max262 or max275.
In the present embodiment, noise jamming identification apparatus for evaluating detects interference strength too big idle channel（It is likely to result in
ADC saturations）, frequency and substantially bandwidth that noise occurs then are determined by OFDM FFT function.Then filtering input control
Device processed determines to use high pass, low pass, band logical according to noise behavior, or is worked with resistance mode, and sets running parameter.Arrowband
Filtering subsystem is filtered using programmable open pipe electric capacity or RC wave filters according to the parameter of setting, and barrage noise can decline
The dB of subtrahend ten.Ofdm system automatic identification available channel, recovers communication, it is to avoid blocked by very noisy, improve communication effect.
The communication process for the OFDM communication systems that the wide and narrow strip of the present embodiment is combined is as follows：
Handshake is set up when starting communication, effective number of shaking hands only is sent in a channel by editor successively in transmitting terminal
It is believed that number, remaining channel is idle channel.
Amplified after receiving terminal reception by low noise amplifier, enter AD converter and be AD converted, then according to association
View removes cyclic prefix, carries out serial to parallel conversion and forms each orthogonal channel in parallel, does Fast Fourier Transfer in FFT respectively
Afterwards, detect that the signal intensity of each orthogonal channel carries out string conversion simultaneously, digital demodulation, finally decode, judge idle after decoding
Channel, it is known that only one of which channel can decode handshake after decoding here, other channels are idle channels, if
Now, the signal intensity of a certain idle channel exceedes the channel that this has handshake, then it is assumed that this channel is strong noise letter
Road, in communication afterwards can without using this channel communication, control low noise amplification after carry out narrow-band filtering, according to
The width of high component noisy communication channel and position set wave filter：If high component noisy communication channel is in the low frequency portion of whole OFDM channels
Point, then using high-pass filter；If high component noisy communication channel is in the HFS of whole OFDM channels, using high-pass filtering
Device；If high component noisy communication channel is in the intermediate-frequency section of whole OFDM channels, using high band trap.
Claims (6)
1. the OFDM means of communication that a kind of wide and narrow strip is combined, the step of receiving terminal includes analog-to-digital conversion, FFT steps and decoding step
Suddenly；It is characterized in that：Also include the step of the step of noise jamming is recognized and assessed, narrow-band noise filter；
The step of described noise jamming identification and assessment, includes：
Signal intensity to every sub-channels after FFT steps is detected；
Acknowledgement channel is idle after decoding step and the then channel of channel signal strength by force carries high score amount noisy communication channel；
Filtered out in described narrow-band noise filter step with high component noisy communication channel.
2. the OFDM means of communication that wide and narrow strip according to claim 1 is combined, it is characterised in that：Also include sending out to receiving terminal
Sending end, which sends notice, allows transmitting terminal not use the step of high component noisy communication channel sends signal.
3. the OFDM means of communication that wide and narrow strip according to claim 1 is combined, it is characterised in that：In described narrow-band noise
In filter step：Wave filter is set according to the width with high component noisy communication channel and position：If high component noisy communication channel exists
The low frequency part of whole OFDM channels, then using high-pass filter；If high component noisy communication channel is in the height of whole OFDM channels
Frequency part, then using high-pass filter；If high component noisy communication channel is in the intermediate-frequency section of whole OFDM channels, using high band
Trap.
4. the OFDM communication systems that a kind of wide and narrow strip is combined, including reception device, described reception device include analog-to-digital conversion
Device, FFT devices and decoder, it is characterised in that：Also include noise jamming identification and apparatus for evaluating, narrow-band filter means, filtering
Feeding control device；
Described noise jamming identification apparatus for evaluating includes detecting each channel signal strength of described FFT devices output
Detection means, to decoder output carry out judge whether be idle channel decision mechanism, with detection means and judgement machine
The connected processor of structure, described processor determines that the strong idle channel of signal intensity is high component noisy communication channel；
The narrow-band filter means that filtering feeding control device control input filters out high component noisy communication channel are added to described modulus
Before converter.
5. the OFDM communication systems that wide and narrow strip according to claim 4 is combined, it is characterised in that：Also include making an uproar high component
Acoustic channel notifies the notice device of receiving terminal.
6. the OFDM communication systems that wide and narrow strip according to claim 4 is combined, it is characterised in that：Described narrow-band filtering dress
Put including the adjustable low pass built using self calibration RC wave filters, SCF, high pass, band resistance, bandpass filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710293774.1A CN107147605A (en) | 2017-04-28 | 2017-04-28 | The OFDM means of communication and system that a kind of wide and narrow strip is combined |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710293774.1A CN107147605A (en) | 2017-04-28 | 2017-04-28 | The OFDM means of communication and system that a kind of wide and narrow strip is combined |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107147605A true CN107147605A (en) | 2017-09-08 |
Family
ID=59774926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710293774.1A Pending CN107147605A (en) | 2017-04-28 | 2017-04-28 | The OFDM means of communication and system that a kind of wide and narrow strip is combined |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107147605A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108519509A (en) * | 2018-04-11 | 2018-09-11 | 威胜集团有限公司 | Novel intelligent electric energy meter and its collecting method |
| CN112073031A (en) * | 2020-09-07 | 2020-12-11 | 青岛鼎信通讯股份有限公司 | Parameter-configurable active filter circuit |
| CN113098564A (en) * | 2021-03-26 | 2021-07-09 | 广州东方电科自动化有限公司 | Bidirectional feedback type coupling high-speed communication method and communication equipment |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85109755A (en) * | 1984-12-19 | 1987-04-08 | 阿里·维瑟 | Method and apparatus for processing extremum coded digitally converted signals |
| CN1439198A (en) * | 1999-04-28 | 2003-08-27 | Isco国际股份有限公司 | Interference detection, identification, extraction and reporting |
| CN101232474A (en) * | 2006-08-28 | 2008-07-30 | 三星电子株式会社 | Apparatus and method for receiving signal in broadband wireless access system |
| CN101789925A (en) * | 2008-12-19 | 2010-07-28 | 英特尔公司 | Methods and systems to estimate channel frequency response in multi-carrier signals |
| CN102122918A (en) * | 2010-01-08 | 2011-07-13 | 英特赛尔美国股份有限公司 | Systems and methods to reduce idle channel current and noise floor in a PWM amplifier |
| CN102857461A (en) * | 2011-06-30 | 2013-01-02 | 重庆重邮信科通信技术有限公司 | Noise power estimating method and device |
| US20140051378A1 (en) * | 2009-05-14 | 2014-02-20 | Silvus Technologies, Inc. | Wideband interference mitigation for devices with multiple receivers |
| CN104038465A (en) * | 2014-06-27 | 2014-09-10 | 华南师范大学 | Multi-sub-block phase noise estimation compensation method suitable for CO-OFDM system |
| CN105791194A (en) * | 2014-12-24 | 2016-07-20 | 国家电网公司 | A synchronization method and system capable of resisting narrowband interference |
| CN106533592A (en) * | 2016-11-25 | 2017-03-22 | 河海大学常州校区 | Multi-service data communication method and communication system for underwater acoustic network |
-
2017
- 2017-04-28 CN CN201710293774.1A patent/CN107147605A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85109755A (en) * | 1984-12-19 | 1987-04-08 | 阿里·维瑟 | Method and apparatus for processing extremum coded digitally converted signals |
| CN1439198A (en) * | 1999-04-28 | 2003-08-27 | Isco国际股份有限公司 | Interference detection, identification, extraction and reporting |
| CN101232474A (en) * | 2006-08-28 | 2008-07-30 | 三星电子株式会社 | Apparatus and method for receiving signal in broadband wireless access system |
| CN101789925A (en) * | 2008-12-19 | 2010-07-28 | 英特尔公司 | Methods and systems to estimate channel frequency response in multi-carrier signals |
| US20140051378A1 (en) * | 2009-05-14 | 2014-02-20 | Silvus Technologies, Inc. | Wideband interference mitigation for devices with multiple receivers |
| CN102122918A (en) * | 2010-01-08 | 2011-07-13 | 英特赛尔美国股份有限公司 | Systems and methods to reduce idle channel current and noise floor in a PWM amplifier |
| CN102857461A (en) * | 2011-06-30 | 2013-01-02 | 重庆重邮信科通信技术有限公司 | Noise power estimating method and device |
| CN104038465A (en) * | 2014-06-27 | 2014-09-10 | 华南师范大学 | Multi-sub-block phase noise estimation compensation method suitable for CO-OFDM system |
| CN105791194A (en) * | 2014-12-24 | 2016-07-20 | 国家电网公司 | A synchronization method and system capable of resisting narrowband interference |
| CN106533592A (en) * | 2016-11-25 | 2017-03-22 | 河海大学常州校区 | Multi-service data communication method and communication system for underwater acoustic network |
Non-Patent Citations (2)
| Title |
|---|
| 张玉松: ""新一代滤波器多载波调制技术研究：Filtered-OFDM信号设计与接收处理"", 《中国优秀硕士学位论文全文数据库信息科技辑》 * |
| 王智慧，李建歧，渠晓峰，赵涛: ""基于OFDM的低压电力线窄带载波通信技术及其应用"", 《2011电力通信管理暨智能电网通信技术论坛论文集》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108519509A (en) * | 2018-04-11 | 2018-09-11 | 威胜集团有限公司 | Novel intelligent electric energy meter and its collecting method |
| CN112073031A (en) * | 2020-09-07 | 2020-12-11 | 青岛鼎信通讯股份有限公司 | Parameter-configurable active filter circuit |
| CN113098564A (en) * | 2021-03-26 | 2021-07-09 | 广州东方电科自动化有限公司 | Bidirectional feedback type coupling high-speed communication method and communication equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103607218B (en) | A kind of across frequency band power-line carrier communication system and communication means thereof | |
| CN107147605A (en) | The OFDM means of communication and system that a kind of wide and narrow strip is combined | |
| US9419661B2 (en) | Impulse noise mitigation under out-of-band interference conditions | |
| CN110224721B (en) | Method and receiver for processing an analog signal from a transmission channel | |
| CN101562590B (en) | OFDM signal intelligent receiving system and receiving method | |
| CN103733529B (en) | Power line communication modem, electric line communication system and power line communication method | |
| JP2005509352A (en) | Method and apparatus for mitigating adjacent channel interference in a wireless communication system | |
| DE60129441T2 (en) | Peak rejection method and data transmission device | |
| WO2022262172A1 (en) | Multi-carrier underwater acoustic anti-interference communication method based on index modulation | |
| CN108649999A (en) | The detection device and detection method of OFDM electric line communication systems narrowband interference | |
| CN101394385B (en) | A Method for Improving the Performance of OFDM Systems Based on Joint Channel Estimation Based on Time-Domain Processing | |
| CN102571139B (en) | Adaptive anti-interference system and method | |
| CN105187350A (en) | Time reversal acoustic communication method based on filtered multitone modulation | |
| CN105389968A (en) | Electric line broadband carrier communication module for low voltage centralization meter reading terminal | |
| CN101388869B (en) | Method for reducing narrow-band interference of OFDM receiver | |
| CN107317784B (en) | Multi-band parallel filtering mixed carrier transmission method | |
| WO2015035922A1 (en) | Device and method for removing narrowband interference of power line communication system | |
| EP2860930A1 (en) | Detecting repeated preamble symbols using over-sized discrete fourier transforms | |
| CN205318606U (en) | A power line broadband carrier communication module that is used for low pressure to concentrate terminal of checking meter | |
| KR101196088B1 (en) | Method and apparatus for detecting co-channel interference signal in orthogonal frequency division multiple system | |
| CN108737029B (en) | A joint method of time-frequency interleaving preprocessing against narrowband interference and impulse noise in OFDM system | |
| Haque et al. | Spectrum Sensing Based on Higher Order Statistics for OFDM Systems over Multipath Fading Channels in Cognitive Radio | |
| CN114928390B (en) | Interference elimination method suitable for broadband satellite communication | |
| CN108282438A (en) | 2-D data hided transmission method based on the mapping of data-driven multi-subcarrier | |
| CN111355514B (en) | Spread spectrum detection method for direct spread spectrum signal |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170908 |
|
| RJ01 | Rejection of invention patent application after publication |