CN112511479B - Carrier communication method - Google Patents
Carrier communication method Download PDFInfo
- Publication number
- CN112511479B CN112511479B CN201910872931.3A CN201910872931A CN112511479B CN 112511479 B CN112511479 B CN 112511479B CN 201910872931 A CN201910872931 A CN 201910872931A CN 112511479 B CN112511479 B CN 112511479B
- Authority
- CN
- China
- Prior art keywords
- frequency
- interference
- signal
- communication
- interference signals
- 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.)
- Active
Links
Images
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
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to a carrier communication method, which comprises the following steps: 1) Acquiring a time domain signal S (t) in a preset time and a preset bandwidth on a communication power line, and performing time-frequency conversion to obtain a frequency domain signal S (f); 2) Determining an interference signal threshold; 3) Comparing the frequency domain signal S (f) with an interference signal threshold value, screening out interference signals with power values or amplitude values larger than the threshold value, wherein each interference signal has a corresponding frequency point; 4) Calculating the frequency F (i) and the number N of OFDM subcarriers, and removing subcarriers which are close to the frequency points of the interference signals, so as to avoid the frequency points of the interference signals, wherein i is the sequence number of the subcarriers, and i=1, 2 … N; and when the number of the removed subcarriers is less than the minimum number of subcarriers required by OFDM communication, the interference signals are inversely transformed to obtain the time domain distribution of the interference signals, and the TDMA communication parameters are calculated, so that the interference signals fall into the TDMA communication time slot interval, the interference signals are avoided in the frequency domain or the time domain, and the transmission effect is better.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a carrier communication method.
Background
The transmission of high-definition video signals requires compression coding of the video and then uses an IP network for transmission, but based on the characteristics and the use environment of an automobile, the transmission of the high-definition video by using the IP network requires a vehicle-mounted gateway for forwarding, and additionally arranges a vehicle-mounted Ethernet cable, which results in high cost of high-definition video transmission, and meanwhile, the reliability of the high-definition video is reduced due to the introduction of the gateway and the vehicle-mounted Ethernet cable. With the development of vehicle auxiliary driving technology, the number of cameras is greatly increased, and the image definition requirement is also greatly improved. The vehicle-mounted Ethernet transmission high-definition video requires the cooperation of a gateway, has poor flexibility and high cost, and is difficult to meet the development requirement of intelligent monitoring.
The carrier communication technology can utilize the existing power line to carry out signal transmission, can reduce the weight and the number of wire harnesses and connectors, uses a ring network structure to carry out network communication, does not need to use a gateway to carry out information exchange, and improves the utilization rate of a network compared with a star network structure of Ethernet communication.
However, in practice, interference signals including noise interference and occasional interference signals exist on the power line, and on/off of different vehicle-mounted electrical equipment on the power line can cause larger impedance variation on the power line, and these factors cause lower speed of carrier communication, larger variation and poor communication stability. Even if the Orthogonal Frequency Division Multiplexing (OFDM) technology is used, the communication rate cannot be stably maintained at a higher level, and for some applications, particularly in a high-definition video transmission system, the communication rate is not high and the fluctuation is large, which can cause the conditions of low video transmission code rate, poor image definition and even video frame loss, thus preventing the further application of the carrier communication technology in vehicles.
Disclosure of Invention
The invention aims to provide a carrier communication method for solving the problem of interference in transmission of high-definition videos on a vehicle-mounted power line.
In order to achieve the above object, the present invention provides a carrier communication method, comprising the steps of:
1) Acquiring a time domain signal S (t) in a preset time and a preset bandwidth on a communication power line, and performing time-frequency conversion to obtain a frequency domain signal S (f);
2) Determining an interference signal threshold;
3) Comparing the frequency domain signal S (f) with an interference signal threshold value, screening out interference signals with power values or amplitude values larger than the threshold value, wherein each interference signal has a corresponding frequency point;
4) Calculating the frequency F (i) and the number N of OFDM subcarriers, and removing subcarriers which are close to the frequency points of the interference signals, so as to avoid the frequency points of the interference signals, wherein i is the sequence number of the subcarriers, and i=1, 2 … N;
5) And carrying out OFDM communication by the removed sub-carriers.
The beneficial effects are that: when the OFDM technology is used for communication, detecting and screening an interference signal, and then removing subcarriers close to the frequency point of the interference signal, so that the frequency point of the interference signal is avoided for communication; the communication signal is not affected by the interference signal in the frequency domain, and the transmission quality of the communication signal can be improved.
Further, the method further comprises the steps of: 6) And carrying out inverse transformation on the interference signals to obtain time domain distribution of the interference signals, and calculating TDMA communication parameters so that the interference signals fall into TDMA communication time slot intervals. The invention can also communicate by avoiding the occurrence time of the interference signal, so that the avoidance is carried out on the communication time, and the influence of the interference signal on the communication signal can be effectively avoided when the frequency domain and the time domain are avoided, so that the signal effect of communication transmission is better.
Further, in step 2), the interference signal threshold is determined according to the normal received signal power and the minimum signal-to-noise ratio of the received signal of the carrier communication chip.
Further, the method for avoiding the interference frequency point in the step 4) is as follows: and comparing the frequency of one subcarrier with the frequencies of all interference signals, and eliminating the subcarrier if the absolute value of the difference between the frequency of the subcarrier and the frequency of any one interference signal is smaller than a frequency difference threshold value. The frequency of the interference point to be avoided is accurately determined through comparison with a frequency difference threshold value.
Further, according to the set bandwidth, the duration of the interference signal is determined, and then the TDMA parameter is calculated.
In order to achieve the above object, the present invention provides a carrier communication method, comprising the steps of:
1) Acquiring a time domain signal S (t) in a preset time and a preset bandwidth on a communication power line, and performing time-frequency conversion to obtain a frequency domain signal S (f);
2) Determining an interference signal threshold;
3) Comparing the frequency domain signal S (f) with an interference signal threshold value, screening out interference signals with power values or amplitude values larger than the threshold value, wherein each interference signal has a corresponding frequency point;
4) Calculating the frequency F (i) and the number N of OFDM subcarriers, and removing subcarriers which are close to the frequency points of the interference signals, so as to avoid the frequency points of the interference signals, wherein i is the sequence number of the subcarriers, and i=1, 2 … N;
5) When the number of the removed subcarriers in the step 4) is less than the minimum number of subcarriers required by OFDM communication, executing the step 6);
6) And carrying out inverse transformation on the interference signals to obtain time domain distribution of the interference signals, and calculating TDMA communication parameters so that the interference signals fall into TDMA communication time slot intervals.
The beneficial effects are that: detecting and screening out interference signals, then eliminating subcarriers close to frequency points of the interference signals, and when the number of the eliminated subcarriers is smaller than the minimum number of subcarriers required by OFDM communication, adopting a method for adjusting TDMA communication parameters, and communicating by avoiding occurrence time of the interference signals, so that avoiding is carried out on communication time, influence of the interference signals on the communication signals can be effectively avoided, and the effect of communication transmission is improved.
Further, in step 2), the interference signal threshold is determined according to the normal received signal power and the minimum signal-to-noise ratio of the received signal of the carrier communication chip.
Further, the manner of avoiding the interference frequency point in the step 4) is as follows: and comparing the frequency of one subcarrier with the frequencies of all interference signals, and eliminating the subcarrier if the absolute value of the difference between the frequency of the subcarrier and the frequency of any one interference signal is smaller than a frequency difference threshold value. The frequency of the interference point to be avoided is accurately determined through comparison with a frequency difference threshold value.
Further, according to the set bandwidth, the occurrence time and duration of the interference signal are determined, and then the TDMA parameter is calculated.
Drawings
FIG. 1 is a flow chart of a communication method according to embodiment 2 of the present invention;
FIG. 2 is a power spectrum diagram of a communication power supply according to embodiment 1 after time-frequency conversion;
FIG. 3 is a diagram of interference signals in the power spectrum of the present invention;
FIG. 4 is a graph of a communication subcarrier signal spectrum determined from an interfering signal in a power spectrum in accordance with the present invention;
fig. 5 is a graph of amplitude spectrum after time-frequency conversion of signals on the communication power supply according to embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in more detail with reference to the accompanying drawings and examples, but the embodiments of the present invention are not limited thereto.
The technical conception of the invention: when the OFDM technology is used for communication, detecting and screening an interference signal, and then removing subcarriers close to the frequency point of the interference signal, so that the frequency point of the interference signal is avoided for communication; the communication can be carried out by avoiding the occurrence time of the interference signal, so that the avoidance is carried out on the communication time, the influence of the interference signal on the communication transmission signal can be effectively avoided when the frequency domain and the time domain are avoided, the signal effect of the communication transmission is good, and the maximized communication rate under the current channel condition is realized.
It should be noted that: according to the method, the interference signals on the communication line are predicted in advance, namely, after a vehicle monitoring system is powered on, the interference signals on a power supply are measured, and the situation of one time period in the time domain and the frequency domain of the interference signals is analyzed. Because the communication mode of the vehicle-mounted video information is carrier communication and is in a relatively closed communication environment, and the number and types of interference signals on an automobile power supply are relatively small, the influence of the interference signals on communication transmission can be well avoided through the communication method.
Method example 1:
(1) After the system is electrified, when the video monitoring system does not enter a working state, signals on a communication power line are measured firstly:
a time domain signal S (t) in a certain (2 MHz-50 MHz) bandwidth on a communication power line is collected, wherein the bandwidth is the working bandwidth of carrier communication. The time-frequency transformation of the time-domain signal S (t) in one period using a fourier FFT algorithm results in a frequency-domain signal S (f) comprising a power spectrum Sp as shown in fig. 2.
(2) Determining an interference signal:
normal received signal power P according to carrier chip used on communication line r And the minimum signal-to-noise ratio SNR (G) min of the received signal to obtain an interference signal threshold I vt ；
I vt ＝P r -SNR(G)min
(3) According to the interference signal threshold value, determining interference signals G (f), wherein each interference signal has a corresponding frequency point f (j), and j is the sequence number of the interference signal; j=1, 2 … M, M < N:
when the power value Sv of the frequency domain signal is greater than the interference signal threshold, determining the signal as an interference signal, and screening out an interference signal G (f), wherein the corresponding frequency is as shown in fig. 3;
and for the interference signals which are not larger than the interference signal threshold and have smaller interference, the interference signals are not determined, and the communication transmission is considered to be not influenced, so that the filtering is not needed, and the frequency band utilization rate can be effectively increased.
(4) Calculating the frequency F (i) and the number N of OFDM subcarriers so as to avoid the subcarriers of the frequency points of the interference signals for OFDM communication:
according to the current communication environment, the frequency F (i) and the number N of OFDM subcarriers are calculated and determined, the frequency F (i) of a certain subcarrier is compared with the frequency F (j) of all interference signals, and if the absolute value of the difference between the frequency of the subcarrier and the frequency of any interference signal is smaller than a frequency difference threshold value delta F, the subcarrier is removed, namely the frequency point is not used for communication.
For example, (1) comparing the frequency F (3) of the 3 rd subcarrier with the frequency F (1) of the first interfering signal, if |f (3) -F (1) | > Δf is satisfied, then comparing the frequency F (3) with the frequency F (2) of the second interfering signal, and if |f (3) -F (2) | < Δf is still satisfied, then the second interfering signal is considered to affect the signal transmission of the 3 rd subcarrier, so that communication is not performed at the frequency point corresponding to the 3 rd subcarrier when transmission control is performed;
comparing the frequency F (1) of the 1 st subcarrier with the frequency F (1) of the first interference signal, if the frequency F (1) -F (1) | > Deltaf is satisfied, then comparing the frequency F (1) of the 1 st subcarrier with the frequency F (2) of the second interference signal, if the frequency F (1) -F (2) | > Deltaf is still satisfied, comparing the frequency F (1) of the 1 st subcarrier with the frequencies of other interference signals, and if the absolute value of the difference between the frequency F (1) of the 1 st subcarrier and the frequency F (j) of all the determined interference signals is larger than the frequency difference threshold Deltaf, considering that the signal transmission of the subcarrier is not affected by the interference signals, and performing communication control.
After the N sub-carriers are compared and analyzed, the frequency points corresponding to the sub-carriers can be determined to be communicated, the frequency points corresponding to the sub-carriers can be influenced by interference signals and need to be removed and avoided, and then the frequency and the number, namely the number of the OFDM sub-carriers are determined again.
When the number of the removed subcarriers meets the minimum subcarrier number requirement required by OFDM communication, directly reconfiguring frequency domain communication parameters, determining a communication subcarrier signal spectrogram according to interference signals in a power spectrum as shown in fig. 4, and then carrying out communication transmission according to the newly configured frequency domain communication parameters. When the number of frequency points of the interference signal is excessive, and the number of the removed subcarriers is less than the minimum frequency point number required by OFDM communication, the frequency domain parameters are not reconfigured, namely the OFDM communication is not carried out according to the removed subcarriers. The time division multiple access TDMA communication technology is directly used, communication time is avoided in the time domain, time domain communication parameters are reconfigured to carry out communication transmission, and the influence of interference signals on communication is reduced as much as possible.
Preferably, the subcarrier frequency with good channel condition is selected to perform communication transmission of information in the frequency and number of the available OFDM subcarriers.
The channel condition is evaluated by signal to noise ratio:
SNR(S)≥SNR(G)min
where SNR (S) is the signal-to-noise ratio of the signal to be transmitted for communication and SNR (G) min is the minimum signal-to-noise ratio of the signal received by the carrier communication chip used.
If the above expression condition is satisfied, the channel condition of the subcarrier is considered to be good, and the subcarrier is preferable as a communication transmission path.
Method example 2:
the difference between this embodiment and method embodiment 1 is that: when the number of the removed sub-carriers meets the minimum sub-carrier number requirement required by OFDM communication, the time division multiple access TDMA communication technology is still considered, so that the occurrence time of the interference signal avoids the communication time, and the time domain communication parameters are reconfigured for communication transmission. Namely, on the basis of avoiding interference signal frequency points in the frequency domain, the occurrence time of the interference signals is avoided in the time domain, and the mutual combination of the frequency domain and the time domain avoiding scheme is shown in fig. 1, so that the influence on the communication signals by the interference signals is smaller, the communication transmission efficiency is high, and the signal effect is better.
Performing Inverse Fast Fourier Transform (IFFT) on the interference signal G (f) determined in the embodiment 1 to obtain time domain distribution of the interference signal (including sporadic interference signals); from this time domain distribution, a set 3dB bandwidth within one period can be measured, and the duration and the appearance time of each interference signal can be calculated from the 3dB bandwidth.
In order to avoid communication transmission at the occurrence time and duration of the interference signal, the specific method for realizing the staggering of the communication signal and the interference signal in the communication time is as follows:
and calculating the time duration and the occurrence time of each interference signal according to the measurement calculation, and calculating the time slot and the time slot interval of the TDMA communication of the system communication signal, wherein the time slot comprises the time of transmitting data and the time of receiving data of each communication node, and the time slot interval refers to the time period between two adjacent time slots.
By adjusting the time slot interval or by adjusting the time slots, the occurrence time and duration of the interference signal are avoided from the communication time slots, i.e. the occurrence time completely falls within the time slot interval.
Meanwhile, information synchronization and transmission rate balance among all communication nodes of the system are ensured, then the optimized and calculated time domain communication parameters are reconfigured, and then communication transmission is carried out according to the newly configured time domain communication parameters, so that the occurrence time of interference signals is avoided, and the reliability of information transmission is improved.
According to the method and the device, the influence of the interference signal on the communication signal can be better avoided by setting the optimal communication parameters of the frequency domain and the time domain, and the maximized transmission of the communication rate is realized.
Method example 3:
the difference between this embodiment and method embodiment 1 is that: the frequency domain signal includes an amplitude spectrum Sv as shown in fig. 5, where the amplitude in the frequency domain signal has a positive correlation with the power, and the interference signal G (f) can also be determined by comparing the amplitude with the threshold of the interference signal, that is, the interference signal can be avoided in the frequency domain through the amplitude spectrum in the frequency domain signal, and the specific implementation means is the same as that in embodiment 1 of the method, and will not be described in detail here.
Claims (9)
1. A method of carrier communication, comprising the steps of:
1) Acquiring a time domain signal S (t) in a preset time and a preset bandwidth on a communication power line, and performing time-frequency conversion to obtain a frequency domain signal S (f);
2) Determining an interference signal threshold;
3) Comparing the frequency domain signal S (f) with an interference signal threshold value, screening out interference signals with power values or amplitude values larger than the threshold value, wherein each interference signal has a corresponding frequency point;
4) Calculating the frequency F (i) and the number N of OFDM subcarriers, and removing subcarriers which are close to the frequency points of the interference signals, so as to avoid the frequency points of the interference signals, wherein i is the sequence number of the subcarriers, and i=1, 2 … N;
5) And when the number of the removed subcarriers meets the minimum subcarrier number requirement for OFDM communication, carrying out OFDM communication by using the removed subcarriers.
2. The carrier communication method according to claim 1, further comprising the step of:
6) And carrying out inverse transformation on the interference signals to obtain time domain distribution of the interference signals, and calculating TDMA communication parameters so that the interference signals fall into TDMA communication time slot intervals.
3. The carrier communication method according to claim 1 or 2, wherein the interference signal threshold is determined in step 2) according to a normal received signal power of the carrier communication chip and a minimum signal-to-noise ratio of the received signal.
4. The carrier communication method according to claim 1 or 2, wherein the manner of avoiding the interference frequency point in step 4) is: and comparing the frequency of one subcarrier with the frequencies of all interference signals, and eliminating the subcarrier if the absolute value of the difference between the frequency of the subcarrier and the frequency of any one interference signal is smaller than a frequency difference threshold value.
5. The carrier communication method of claim 2, wherein the TDMA parameters are calculated by determining the occurrence time and duration of the interference signal based on the set bandwidth.
6. A method of carrier communication, comprising the steps of:
1) Acquiring a time domain signal S (t) in a preset time and a preset bandwidth on a communication power line, and performing time-frequency conversion to obtain a frequency domain signal S (f);
2) Determining an interference signal threshold;
3) Comparing the frequency domain signal S (f) with an interference signal threshold value, screening out interference signals with power values or amplitude values larger than the threshold value, wherein each interference signal has a corresponding frequency point;
4) Calculating the frequency F (i) and the number N of OFDM subcarriers, and removing subcarriers which are close to the frequency points of the interference signals, so as to avoid the frequency points of the interference signals, wherein i is the sequence number of the subcarriers, and i=1, 2 … N;
5) When the number of the removed subcarriers in the step 4) is less than the minimum number of subcarriers required by OFDM communication, executing the step 6);
6) And carrying out inverse transformation on the interference signals to obtain time domain distribution of the interference signals, and calculating TDMA communication parameters so that the interference signals fall into TDMA communication time slot intervals.
7. The method according to claim 6, wherein the interference signal threshold is determined in step 2) according to a normal received signal power of the carrier communication chip and a minimum signal-to-noise ratio of the received signal.
8. The carrier communication method of claim 6, wherein the manner of avoiding the interference frequency point in step 4) is: and comparing the frequency of one subcarrier with the frequencies of all interference signals, and eliminating the subcarrier if the absolute value of the difference between the frequency of the subcarrier and the frequency of any one interference signal is smaller than a frequency difference threshold value.
9. The carrier communication method of claim 6, wherein the TDMA parameters are calculated by determining the occurrence time and duration of the interference signal based on the set bandwidth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910872931.3A CN112511479B (en) | 2019-09-16 | 2019-09-16 | Carrier communication method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910872931.3A CN112511479B (en) | 2019-09-16 | 2019-09-16 | Carrier communication method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112511479A CN112511479A (en) | 2021-03-16 |
| CN112511479B true CN112511479B (en) | 2023-05-09 |
Family
ID=74924044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910872931.3A Active CN112511479B (en) | 2019-09-16 | 2019-09-16 | Carrier communication method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112511479B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552859B (en) * | 2021-07-27 | 2022-11-25 | 特灵空调系统(中国)有限公司 | Communication control method, main controller, equipment, temperature controller and readable storage medium |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010105489A1 (en) * | 2009-03-19 | 2010-09-23 | 华为技术有限公司 | Method, apparatus and system for allocating carrier |
| CN104301053A (en) * | 2014-10-30 | 2015-01-21 | 成都新光微波工程有限责任公司 | Frequency spectrum monitoring device capable of effectively evading radio interference |
| CN105516032A (en) * | 2014-09-23 | 2016-04-20 | 华为技术有限公司 | Adaptive narrowband interference elimination method and device |
| WO2016112732A1 (en) * | 2015-01-13 | 2016-07-21 | 中兴通讯股份有限公司 | Frequency spectrum interference processing method, gsm base station and lte base station |
| CN105959246A (en) * | 2016-04-22 | 2016-09-21 | 上海瀚讯无线技术有限公司 | Anti-interference method |
| CN108649999A (en) * | 2018-07-06 | 2018-10-12 | 北京智芯微电子科技有限公司 | The detection device and detection method of OFDM electric line communication systems narrowband interference |
| CN109547373A (en) * | 2018-11-16 | 2019-03-29 | 西安宇飞电子技术有限公司 | Frequency deviation estimating method and frequency deviation estimation system for ofdm system frequency domain strong interference environment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5311978B2 (en) * | 2008-11-14 | 2013-10-09 | ラピスセミコンダクタ株式会社 | Interference detector and equalizer using the same |
-
2019
- 2019-09-16 CN CN201910872931.3A patent/CN112511479B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010105489A1 (en) * | 2009-03-19 | 2010-09-23 | 华为技术有限公司 | Method, apparatus and system for allocating carrier |
| CN105516032A (en) * | 2014-09-23 | 2016-04-20 | 华为技术有限公司 | Adaptive narrowband interference elimination method and device |
| CN104301053A (en) * | 2014-10-30 | 2015-01-21 | 成都新光微波工程有限责任公司 | Frequency spectrum monitoring device capable of effectively evading radio interference |
| WO2016112732A1 (en) * | 2015-01-13 | 2016-07-21 | 中兴通讯股份有限公司 | Frequency spectrum interference processing method, gsm base station and lte base station |
| CN105959246A (en) * | 2016-04-22 | 2016-09-21 | 上海瀚讯无线技术有限公司 | Anti-interference method |
| CN108649999A (en) * | 2018-07-06 | 2018-10-12 | 北京智芯微电子科技有限公司 | The detection device and detection method of OFDM electric line communication systems narrowband interference |
| CN109547373A (en) * | 2018-11-16 | 2019-03-29 | 西安宇飞电子技术有限公司 | Frequency deviation estimating method and frequency deviation estimation system for ofdm system frequency domain strong interference environment |
Non-Patent Citations (2)
| Title |
|---|
| Xingbin Tu ; Xiaomei Xu ; Liangliang Yang ; Zhenwen Liu.Application of single carrier fractional Fourier Domain Equalization in underwater acoustic communication.《2016 IEEE/OES China Ocean Acoustics (COA)》.2016, * |
| 张旭明 ; 潘宇 ; 马侠 ; 王勇 ; 邓霜 ; 章晓蕾.电力线载波通信芯片.《钜泉光电科技》.2013, * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112511479A (en) | 2021-03-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8306012B2 (en) | Channel estimation for synchronized cells in a cellular communication system | |
| US11431381B2 (en) | Optimized PHY frame structure for OFDM based narrowband PLC | |
| US7924940B2 (en) | Communication network system, and transmission/reception apparatus, method and integrated circuit for use therein | |
| US8743974B2 (en) | Adaptive modulation and coding with frame size adjustment for power line communications (PLC) | |
| EP3382950B1 (en) | Signaling method for interference group discovery in cable modems | |
| EP2730034B1 (en) | Power line communication modem, power line communication system and power line communication method | |
| US10103780B1 (en) | Dual mode communication over automotive power lines | |
| US20130051268A1 (en) | Carrier Sense Multiple Access (CSMA) and Collision Detection for Power Line Communications (PLC) Using a Noise Model | |
| CN112511479B (en) | Carrier communication method | |
| CN101986629B (en) | Method and device for estimating narrowband interference as well as receiving equipment thereof | |
| Liu et al. | On (power-) line defined PLC system | |
| Moaveninejad et al. | Gaussian-middleton classification of cyclostationary correlated noise in hybrid MIMO-OFDM WiNPLC | |
| US10382156B2 (en) | Reducing interference using interpolation/extrapolation | |
| KR101673180B1 (en) | Apparatus and method for channel estimate in wireless communication system | |
| EP2664078B1 (en) | Header alignment in communication system | |
| CN112448903A (en) | Method and device for eliminating inter-subcarrier interference based on OFDM system | |
| CN108293031B (en) | Transmitter for multicarrier communication | |
| KR101989005B1 (en) | Apparatus and method for saving power consumption in broadband wireless communication system | |
| Vo | MIMO techniques for the transmission and resource allocation in in-home Power Line Communication | |
| KR101710912B1 (en) | Method for evaluating noise power and Apparatus thereof | |
| Mo et al. | Channel estimation for power line OFDM systems with unknown colored noise exploiting real signal transmission | |
| De Piante et al. | Broadband PLC field trial on a compact electric vehicle | |
| CN104242984A (en) | Narrow-band interference elimination method and device | |
| Nzéza et al. | Dynamic spectral monitoring for flexible and reconfigurable railways communication systems | |
| Moaveninejad et al. | MIMO-OFDM WiNPLC |
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 | ||
| CB02 | Change of applicant information |
Address after: No. 6, Yutong Road, Guancheng Hui District, Zhengzhou, Henan 450061 Applicant after: Yutong Bus Co.,Ltd. Address before: No.1, Shibali Heyu Road, Guancheng Hui District, Zhengzhou City, Henan Province Applicant before: ZHENGZHOU YUTONG BUS Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |