CN112511479A - Carrier communication method - Google Patents
Carrier communication method Download PDFInfo
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- CN112511479A CN112511479A CN201910872931.3A CN201910872931A CN112511479A CN 112511479 A CN112511479 A CN 112511479A CN 201910872931 A CN201910872931 A CN 201910872931A CN 112511479 A CN112511479 A CN 112511479A
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- 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
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- 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
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- 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) within preset time and preset bandwidth on a communication power line, and performing time-frequency transformation 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, and screening out interference signals of which the power value or amplitude is greater than the threshold value, wherein each interference signal has a corresponding frequency point; 4) calculating the frequency F (i) and the number N of the OFDM subcarriers, and eliminating the subcarriers which are close to the frequency point of the interference signal so as to avoid the frequency point of the interference signal, wherein i is the serial number of the subcarrier, and i is 1,2 … N; and directly carrying out OFDM communication by using the eliminated subcarriers, when the quantity of the eliminated subcarriers is less than the quantity of the lowest subcarriers required by the OFDM communication, carrying out inverse transformation on the interference signals to obtain the time domain distribution of the interference signals, calculating TDMA communication parameters, enabling the interference signals to fall into a TDMA communication time slot interval, avoiding the interference signals in a frequency domain or a time domain, and having better transmission effect.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a carrier communication method.
Background
High definition video signal's transmission needs to carry out compression coding with the video, then uses the IP network to transmit, but based on the characteristic and the service environment of car itself, uses the IP network to transmit high definition video and needs on-vehicle gateway to forward, and need additionally arrange on-vehicle ethernet cable, can lead to high definition video transmission's with high costs, simultaneously, owing to introduce gateway and on-vehicle ethernet cable, leads to its reliability to reduce. With the development of the vehicle driving assisting technology, the number of cameras is greatly increased, and the requirement on image definition is greatly improved. The vehicle-mounted Ethernet transmission high-definition video needs the cooperation of a gateway, is poor in flexibility and high in cost, and is difficult to meet the development requirement of intelligent monitoring.
The carrier communication technology can utilize the existing power line to transmit signals, can reduce the weight and the number of wiring 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 the network compared with a star network structure of Ethernet communication.
However, in practice, interference signals including noise interference and incidental interference signals exist on the power line, and the impedance change on the power line is large due to the on-off of different vehicle-mounted electrical equipment on the power supply, and due to the factors, the carrier communication rate is low, the change is large, and the communication stability is poor. Even if an Orthogonal Frequency Division Multiplexing (OFDM) technology is used, the communication rate cannot be stably maintained at a high level, and for some applications, particularly in a high-definition video transmission system, the communication rate is not high and the fluctuation is large, so that the video transmission code rate is low, the image definition is poor, and even a video frame loss situation occurs, which hinders further application of the carrier communication technology in vehicles.
Disclosure of Invention
The invention aims to provide a carrier communication method to solve 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, including the following steps:
1) acquiring a time domain signal S (t) within preset time and preset bandwidth on a communication power line, and performing time-frequency transformation 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, and screening out interference signals of which the power value or amplitude is greater than the threshold value, wherein each interference signal has a corresponding frequency point;
4) calculating the frequency F (i) and the number N of the OFDM subcarriers, and eliminating the subcarriers which are close to the frequency point of the interference signal so as to avoid the frequency point of the interference signal, wherein i is the serial number of the subcarrier, and i is 1 and 2 … N;
5) and carrying out OFDM communication by the eliminated subcarriers.
Has the advantages that: when the OFDM technology is used for communication, detecting and screening interference signals, and then rejecting subcarriers close to frequency points of the interference signals, so that the frequency points of the interference signals are 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 also comprises the following steps: 6) and performing inverse transformation on the interference signal to obtain the time domain distribution of the interference signal, and calculating TDMA communication parameters to enable the interference signal to fall into a TDMA communication time slot interval. The invention can also carry out communication by avoiding the occurrence time of the interference signal, thereby avoiding the communication time, avoiding the interference signal in the frequency domain and the time domain, effectively avoiding the influence of the interference signal on the communication signal and ensuring 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 of the carrier communication chip and the minimum signal-to-noise ratio of the received signal.
Further, the way of avoiding the interference frequency points in step 4) is: and comparing the frequency of one subcarrier with the frequencies of all interference signals, and if the absolute value of the difference between the frequency of the subcarrier and the frequency of any one interference signal is less than a frequency difference threshold value, rejecting the subcarrier. The frequency of the interference point to be avoided is accurately determined through comparison with a frequency difference threshold value.
Furthermore, 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, including the following steps:
1) acquiring a time domain signal S (t) within preset time and preset bandwidth on a communication power line, and performing time-frequency transformation 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, and screening out interference signals of which the power value or amplitude is greater than the threshold value, wherein each interference signal has a corresponding frequency point;
4) calculating the frequency F (i) and the number N of the OFDM subcarriers, and eliminating the subcarriers which are close to the frequency point of the interference signal so as to avoid the frequency point of the interference signal, wherein i is the serial number of the subcarrier, and i is 1 and 2 … N;
5) when the subcarriers are eliminated in the step 4), the quantity of the eliminated subcarriers is less than the quantity of the lowest subcarriers required by OFDM communication, and the step 6) is executed;
6) and performing inverse transformation on the interference signal to obtain the time domain distribution of the interference signal, and calculating TDMA communication parameters to enable the interference signal to fall into a TDMA communication time slot interval.
Has the advantages that: and detecting and screening the interference signals, and then rejecting subcarriers close to the frequency points of the interference signals to reject the subcarriers, so that the number of the rejected subcarriers is less than the minimum number of the subcarriers required by OFDM communication, adopting a method for adjusting TDMA communication parameters, and avoiding the occurrence time of the interference signals to carry out communication, thereby avoiding the influence of the interference signals on the communication signals effectively and improving the effect of communication transmission.
Further, in step 2), the interference signal threshold is determined according to the normal received signal power of the carrier communication chip and the minimum signal-to-noise ratio of the received signal.
Further, the method for avoiding the interference frequency point in step 4) is as follows: and comparing the frequency of one subcarrier with the frequencies of all interference signals, and if the absolute value of the difference between the frequency of the subcarrier and the frequency of any one interference signal is less than a frequency difference threshold value, rejecting the subcarrier. The frequency of the interference point to be avoided is accurately determined through comparison with a frequency difference threshold value.
Furthermore, 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 flowchart of a communication method according to embodiment 2 of the present invention;
fig. 2 is a power spectrum after time-frequency transformation of a signal on a communication power supply in embodiment 1 of the present invention;
FIG. 3 illustrates an interference signal in a power spectrum according to 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 an amplitude spectrogram after time-frequency transformation of a signal on a communication power supply in embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings and examples, but the embodiments of the present invention are not limited thereto.
The technical idea of the invention is as follows: when the OFDM technology is used for communication, detecting and screening interference signals, and then rejecting subcarriers close to frequency points of the interference signals, so that the frequency points of the interference signals are avoided for communication; the communication can be carried out by avoiding the time of the occurrence of the interference signal, so that the communication time is avoided, the frequency domain and the time domain are avoided, the influence of the interference signal on the communication transmission signal can be effectively 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: the method comprises the steps of predicting interference signals on a communication line in advance, namely measuring the interference signals on a power supply after a vehicle monitoring system is powered on, and analyzing the condition of a time period in time domain and frequency domain distribution of the interference signals. Because the communication mode of the vehicle-mounted video information is carrier communication, the vehicle-mounted video information is in a relatively closed communication environment, and the number and types of interference signals on the automobile power supply are 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 powered on, when the video monitoring system does not enter a working state, signals on a communication power line are measured firstly:
and acquiring a time domain signal S (t) in a certain (2MHz-50MHz) bandwidth on a communication power line within a period of time, wherein the bandwidth is the working bandwidth of carrier communication. Performing time-frequency transformation on the time domain signal s (t) in one period by using a fourier FFT algorithm to obtain a frequency domain signal s (f), where the frequency domain signal s (f) includes a power spectrum Sp as shown in fig. 2.
(2) Determining an interference signal:
according to normal received signal power P of carrier chip used on communication linerAnd the minimum signal-to-noise ratio SNR (G) min of the received signal to obtain an interference signal threshold Ivt；
Ivt＝Pr-SNR(G)min
(3) Determining interference signals G (f) according to interference signal threshold values, wherein each interference signal has a corresponding frequency point f (j), and j is a serial number of the interference signal; j is 1,2 … M, M < N:
when the power value Sv of the frequency domain signal is greater than the threshold of the interference signal, the signal is determined to be the interference signal, and the corresponding frequency of the screened interference signal g (f) is as shown in fig. 3;
interference signals which are not larger than the threshold value of the interference signals and have small interference are not determined to be interference signals, and the communication transmission is not influenced, so that the interference signals do not need to be filtered, and the frequency band utilization rate can be effectively increased.
(4) Calculating the frequency F (i) and the number N of the OFDM subcarriers to avoid the subcarriers of the frequency points of the interference signals to carry out 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 one 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) the frequency F (3) of the 3 rd subcarrier is compared with the frequency F (1) of the first interference signal, if | F (3) -F (1) | > Δ F is satisfied, the frequency F (3) is compared with the frequency F (2) of the second interference signal, and if | F (3) -F (2) | <Δf is still satisfied, it is considered that the second interference signal affects the signal transmission of the 3 rd subcarrier, and therefore, communication is not performed at the frequency point corresponding to the 3 rd subcarrier during transmission control;
comparing the frequency F (1) of the 1 st subcarrier with the frequency F (1) of the first interference signal, if the frequency satisfies | F (1) -F (1) | > < delta F, then comparing the frequency F (1) of the 1 st subcarrier with the frequency F (2) of the second interference signal, if the frequency still satisfies | F (1) -F (2) | > < delta F, comparing with the frequency of other interference signals, if the absolute value of the difference value of the frequency F (1) of the 1 st subcarrier after being compared with the frequency F (j) of all determined interference signals is greater than the frequency difference threshold value < delta F, considering that the signal transmission of the subcarrier is not influenced by the interference signals, and performing communication control on the subcarrier.
After the N subcarriers are compared and analyzed, the frequency points corresponding to the subcarriers can be determined to be capable of communicating, the frequency points corresponding to the subcarriers can be influenced by interference signals and need to be eliminated and avoided, and then the frequency and the number, namely the number, of the OFDM subcarriers are determined again.
When the number of the removed subcarriers meets the requirement of the minimum number of subcarriers required by OFDM communication, the frequency domain communication parameters are directly reconfigured, a communication subcarrier signal spectrogram determined according to interference signals in the power spectrum is shown in FIG. 4, and then communication transmission is performed according to the newly configured frequency domain communication parameters. When the number of frequency points of the interference signal is too large, and the number of the eliminated subcarriers is less than the number of the lowest frequency points required by the OFDM communication, the frequency domain parameters are not reconfigured, namely the OFDM communication is not carried out according to the eliminated subcarriers. The time division multiple access TDMA communication technology is directly used, communication time is avoided in a time domain, time domain communication parameters are reconfigured for 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 from the frequencies and the number of OFDM subcarriers which can be newly determined, and information is transmitted and received.
Evaluating the channel condition through signal-to-noise ratio:
SNR(S)≥SNR(G)min
snr(s) is a signal-to-noise ratio of a signal to be transmitted, and snr (g) min is a minimum signal-to-noise ratio of a signal received by a used carrier communication chip.
If the above-mentioned condition is satisfied, the channel condition of the subcarrier is considered to be good, and the channel is preferably used as a communication transmission path.
Method example 2:
this example differs from method example 1 in that: when the number of the eliminated subcarriers meets the requirement of the minimum number of subcarriers required by OFDM communication, a time division multiple access TDMA communication technology is still considered, so that the occurrence time of interference signals avoids communication time, and time domain communication parameters are reconfigured for communication transmission. Namely, on the basis of frequency point avoidance of the interference signal in the frequency domain, the occurrence time of the interference signal is also 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 of the interference signal on the communication signal is smaller, the communication transmission efficiency is high, and the signal effect is better.
Performing inverse IFFT on the interference signal g (f) determined in embodiment 1 to obtain time domain distribution of the interference signal (including incidental interference signal); according to the time domain distribution, the set 3dB bandwidth in one period can be measured, and the duration and the occurrence time of each interference signal are calculated according to the 3dB bandwidth.
In order to avoid communication transmission at the occurrence time and duration of the interference signal, a specific method for realizing communication signal and interference signal staggering on communication time comprises the following steps:
the TDMA communication time slot and the time slot interval of the system communication signals can be calculated according to the duration and the occurrence time of each interference signal obtained by the measurement calculation, wherein the time slot comprises the time for each communication node to transmit data and the time for each communication node to receive data, 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 slot, the occurrence time and duration of the interference signal are kept away from the communication time slot, 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 transmission of the maximized communication rate is realized.
Method example 3:
this example differs from method example 1 in that: the frequency domain signal includes an amplitude spectrum Sv as shown in fig. 5, the amplitude in the frequency domain signal is in a positive correlation with the power, and the interference signal g (f) can also be determined by comparing the amplitude with the interference signal threshold, that is, the interference signal can also be avoided in the frequency domain by the amplitude spectrum in the frequency domain signal, and the specific implementation means is the same as that in method embodiment 1, and is not described here in detail.
Claims (9)
1. A carrier communication method, comprising the steps of:
1) acquiring a time domain signal S (t) within preset time and preset bandwidth on a communication power line, and performing time-frequency transformation 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, and screening out interference signals of which the power value or amplitude is greater than the threshold value, wherein each interference signal has a corresponding frequency point;
4) calculating the frequency F (i) and the number N of the OFDM subcarriers, and eliminating the subcarriers which are close to the frequency point of the interference signal so as to avoid the frequency point of the interference signal, wherein i is the serial number of the subcarrier, and i is 1 and 2 … N;
5) and carrying out OFDM communication by the eliminated subcarriers.
2. The carrier communication method according to claim 1, further comprising the steps of:
6) and performing inverse transformation on the interference signal to obtain the time domain distribution of the interference signal, and calculating TDMA communication parameters to enable the interference signal to fall into a TDMA communication time slot interval.
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 interfering frequency points in step 4) is: and comparing the frequency of one subcarrier with the frequencies of all interference signals, and if the absolute value of the difference between the frequency of the subcarrier and the frequency of any one interference signal is less than a frequency difference threshold value, rejecting the subcarrier.
5. The carrier communication method according to claim 2, wherein the TDMA parameter is calculated by determining an occurrence time and a duration of the interference signal according to the set bandwidth.
6. A carrier communication method, comprising the steps of:
1) acquiring a time domain signal S (t) within preset time and preset bandwidth on a communication power line, and performing time-frequency transformation 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, and screening out interference signals of which the power value or amplitude is greater than the threshold value, wherein each interference signal has a corresponding frequency point;
4) calculating the frequency F (i) and the number N of the OFDM subcarriers, and eliminating the subcarriers which are close to the frequency point of the interference signal so as to avoid the frequency point of the interference signal, wherein i is the serial number of the subcarrier, and i is 1 and 2 … N;
5) when the subcarriers are eliminated in the step 4), the quantity of the eliminated subcarriers is less than the quantity of the lowest subcarriers required by OFDM communication, and the step 6) is executed;
6) and performing inverse transformation on the interference signal to obtain the time domain distribution of the interference signal, and calculating TDMA communication parameters to enable the interference signal to fall into a TDMA communication time slot interval.
7. The carrier communication 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 according to claim 6, wherein the manner of avoiding the interference frequency points in step 4) is: and comparing the frequency of one subcarrier with the frequencies of all interference signals, and if the absolute value of the difference between the frequency of the subcarrier and the frequency of any one interference signal is less than a frequency difference threshold value, rejecting the subcarrier.
9. The carrier communication method according to claim 6, wherein the TDMA parameter is calculated by determining an occurrence time and a duration of the interference signal according to the set bandwidth.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552859A (en) * | 2021-07-27 | 2021-10-26 | 特灵空调系统(中国)有限公司 | Communication control method, main controller, device, temperature controller and readable storage medium |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100124267A1 (en) * | 2008-11-14 | 2010-05-20 | Oki Semiconductor Co., Ltd. | Apparatus and method for detecting interference wave |
| 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 |
-
2019
- 2019-09-16 CN CN201910872931.3A patent/CN112511479B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100124267A1 (en) * | 2008-11-14 | 2010-05-20 | Oki Semiconductor Co., Ltd. | Apparatus and method for detecting interference wave |
| 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)》 * |
| 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》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552859A (en) * | 2021-07-27 | 2021-10-26 | 特灵空调系统(中国)有限公司 | Communication control method, main controller, device, temperature controller and readable storage medium |
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