CN101414884A - Method for avoiding digital household radio equipment from environment equipment interference - Google Patents
Method for avoiding digital household radio equipment from environment equipment interference Download PDFInfo
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- CN101414884A CN101414884A CNA2008102195282A CN200810219528A CN101414884A CN 101414884 A CN101414884 A CN 101414884A CN A2008102195282 A CNA2008102195282 A CN A2008102195282A CN 200810219528 A CN200810219528 A CN 200810219528A CN 101414884 A CN101414884 A CN 101414884A
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Abstract
The invention provides a method for preventing wireless devices from interference of external devices. In the method, the front end module of the wireless device in digital home environment is firstly used, and signals of the wireless device within operating frequency band are periodically received; and then, the received signals are sent to the detection module of the wireless device, the detection module judging whether there exists interferences of household appliances or other wireless devices by methods of energy detection and feature detection and then sending judgment signals to a processing module; the processing module sends control commands to the front end module and the detection module according to the judgment signals and adjusts the working mode of the front end module and the detection mode of the detection module so that the wireless device effectively avoids the interferences of household appliances or other wireless devices in digital home environment, thereby being capable of being more suitable for complicated wireless environment in digital home.
Description
Technical field
The present invention relates to the digital home network field, relate in particular to the method that wireless device avoids household electrical appliance and other wireless devices to disturb in the digital home.
Technical background
Digital home is the concrete product that IT, information home, communication highly merge, and the emphasis of digital home is interconnection and merge.And wireless technology has special advantages, the digital home network that can provide WLAN (wireless local area network), multimedia and memory technology to integrate easily.Existing in the market family wireless network technical solution generally is the technical foundation of 802.11x (802.11a/802.11g) wireless lan (wlan).There is ultra broadband (UWB) technology of very low power consumption and very high data transmission bauds also to become a kind of emerging Radio Transmission Technology simultaneously.But standard in the digital home wireless net and disunity.Except 802.11x and UWB technology, also has bluetooth, wireless network transmissions standards such as Zigbee.In addition, mobile communication (GSM), Digital Television (UHF/VHF) use in the family all will increase the complexity of digital home's electromagnetic environment, so exist the interference problem of electromagnetic compatibility and heterogeneous wireless network between them.This interference can solve by the planning of certain frequency spectrum, but now each producer, variously organize the standard of all having formulated oneself and do not have unified frequency spectrum to plan.Simultaneously, because the interference of generations such as household electrical appliance such as microwave oven also can bring very big influence to the wireless network in the digital home.
FCC (FCC) studies show that in a large number, some unauthorized frequency range such as industry, science and medical science frequency range (ISM) and be suitable for the 2GHz of land mobile about authorize frequency range too crowded, and some authorizes frequency range often idle, utilance only is 15%-80%.Frequency range in the digital home wireless environment is used also similar problem, and particularly overlapping except the frequency spectrum of multiple wireless network standard has in 2.4HHz left and right sides frequency range, the interference of household equipment such as microwave oven also is present in this frequency range.And the utilization rate of other mandate frequency range such as UHF/VHF and unauthorized high-frequency band (UWB) is not high.Therefore how to make full use of the not high frequency range of utilization rate, to solve interference and the artificial disturbance problem between the wireless isomer network, raising wireless transmission channel quality has become the emphasis research topic in the digital home wireless network.
Because cognitive radio (CR) has the particularly characteristic of frequency spectrum operating environment of energy perception surrounding environment, the present invention is incorporated into the wireless technology of digital home network to the CR technology, proposes a kind of method of avoiding household electrical appliance and isomery to disturb based on wireless device in the digital home of cognitive radio technology.Adopt Cognitive Radio Technology to improve the flexibility of spectrum utilization, improve frequency spectrum share, effectively avoid the interference of household electrical appliance, coexist better with other wireless system simultaneously, improve the performance of message transmission rate and whole digital home network.
Summary of the invention
The objective of the invention is to overcome the prior art above shortcomings, the method that wireless device avoids external device to disturb in the digital home is provided, described external device comprises household electrical appliance and other wireless devices except that this equipment, this method adopts cognitive radio technology, making wireless device have frequency range detects, the function of signal decision and information processing, therefore this wireless device can effectively avoid household electrical appliance and other various wireless devices to disturb in digital household environment, thereby can better adapt to wireless environment complicated in the digital home.Solution of the present invention is as follows:
Wireless device is avoided the method that household electrical appliance and isomery disturb in a kind of digital home, comprises the steps:
(1) at first in digital household environment, uses front-end module in the wireless device, periodically receive the signal in this wireless device working frequency range, and the signal that receives is passed to detection module in the wireless device.
(2) detection module judges whether to exist the interference of household electrical appliance and other wireless devices by the method for energy measuring and feature detection, and decision signal is sent to processing module.
(3) processing module according to decision signal to detection module and front-end module transmitting control commands.
(4) front-end module and detection module are adjusted mode of operation according to the control command that processing module sends, and the frequency range that makes this wireless device avoid being disturbed is carried out transfer of data.
Front-end module in the said method is controlled the bandwidth on the RF of whole wireless device work.Its wide band radio-frequency that has is set in the work of 8-10 octave, and can carry out tuning and energy control, uses the needs of circuit CAD optimal design with the broadband power amplifier of the low-noise preamplifier that reaches the broadband, several octaves simultaneously.Simultaneously for the bandwidth of operation more than 10 octaves, adopt multi-band combined antenna, promptly use several pairs of antennas at full frequency band even each frequency range, the formation broad-band antenna combines, as in Speakeasy, adopt segmentation to realize, the frequency range of 2-2000MHz is divided into three sections: 2-30MHz, 30-500MHz, 500-2000MHz.
Detection module in the said method step 2 includes two submodules: energy detection module and feature detection module,
(1) energy detection module: the energy detection module among the present invention is mainly analyzed to received signal and is handled by energy detection algorithm to judge whether to exist the interference of household electrical appliance to wireless device.Energy detection module is handled the signal that receives the signal that obtains in the desired frequency band; Then this signal is carried out square and carry out integration, the energy value of picked up signal in the cycle at certain hour; At last the energy value of acquisition and the threshold value of setting are compared, judge whether the existence that household electrical appliance disturb.The advantage of energy detection method is not need the form of signal is made any hypothesis, can be fit to any modulation system, also can provide the roughly frequency range at signal place.
(2) feature detection module: in digital household environment except digital home appliance, also exist a large amount of heterogeneous wireless network equipment and terminal, and only depend on energy measuring can't clearly reflect energy distributions situation on interior each frequency of frequency range, can not provide the feature of each signal, therefore can not estimate to provide essential information for concrete running parameter; Yet most wireless communication signals promptly all makes the statistical property of signal present periodically to the intrinsic periodicity of discrete sampling, scanning, modulation, multiple access, coding and the physical phenomenon of signal owing to be subjected to the modulation of artificial periodic signal.Therefore modulation signal has typical cyclo-stationary, so in order further to detect different wireless signals, the present invention utilizes its circulation spectral density function feature to finish its detection and parameter Estimation in the feature detection module.Promptly obtain its spectrum correlation function (SCF) to received signal, and can distinguish different cyclo-stationary signals, thereby realize differentiation various wireless signals in the digital home according to different circulation spectrums.
Processing module in the step in the said method (3): processing module is by receiving the detection discriminative information of detection module, and discriminative information is handled and classified, then forward end module and detection module transmitting control commands.Store the spendable band information of wireless device among the present invention in this module, if the detection discriminative information that receives shows current frequency range the interference of household electrical appliance interference or other wireless devices is arranged, the required information of the frequency range of switching is then arranged in the control command that processing module forward end module sends, comprise band bandwidth, the frequency range occupancy is switched maximum delay.Do not have household electrical appliance to disturb and do not have the interference of other wireless devices if the detection discriminative information that receives shows current frequency range, then processing module forward end module sends transmission data and the periodically order of received signal.Simultaneously, the control command that processing module sends to detection module comprises opens the energy detection module order, closes the energy detection module order, the order of access opening feature detection module, the order of closing characteristics detection module.Processing module is by avoiding the interference of household electrical appliance interference and other wireless devices to the control of front-end module and detection module.
The present invention has following beneficial effect:
1, the broad-band antenna in the front-end module can receive all signals in the wireless device working frequency range, thereby can guarantee that processing module has accurate cognition to wireless environment complicated in the family, so that make judgement.Broad-band antenna can also make wireless device have the ability of carrying out transfer of data in the frequency band range of broad simultaneously, so wireless device can switch to other frequency ranges apace and transmit, thereby avoid interference when running into interference.
2, the existence of energy detection module makes wireless device promptly differentiate the interference of household electrical appliance in the family wireless environment of complexity.Because energy detection module is based on energy detection algorithm, the characteristics of this algorithm are to come judgment signal according to signal energy, and this algorithm is simple, and are quick, and do not need to know the concrete form of signal.Therefore this module is short for time of occurrence, disturbs very strong household electrical appliance signal, such as microwave oven, has good detectability.Thereby make wireless device can well avoid the interference of household electrical appliance.
3, the feature detection module can allow wireless device avoid the interference of other wireless devices in the family.Characteristic detection method in the feature detection module can be distinguished the type of signal according to its cyclostationarity from various wireless signal, so the feature detection module among the present invention makes wireless device to the wireless environment of digital home's complexity better adaptability be arranged.
Description of drawings
The module diagram that Fig. 1 avoids external device to disturb for wireless device in the digital home in the execution mode;
Fig. 2 is the flow chart that avoids interference of embodiment of the present invention;
Fig. 3 is the fundamental diagram of energy detection module among Fig. 1;
Fig. 4 is the fundamental diagram of feature detection module among Fig. 1;
Fig. 5 is the input/output function figure of processing module among Fig. 1.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described further.
Wireless device is avoided the module diagram of the method for external device interference in a kind of digital home, as shown in Figure 1, is provided with three modules in digital home wireless equipment, is respectively front-end module, detection module and processing module.Front-end module is controlled the bandwidth on the RF of whole wireless device work, and uses the wireless signal of at least one wide-band tuning antenna in the reception work at present frequency range of working frequency range intercycle and transmission data.Simultaneously, also can use multi-band combined antenna in the middle of the front-end module to satisfy the work on wideband section more; The control command that it also must receiving processing module is to determine mode of operation and working frequency range in addition.
Detection module is used for the output of receiving front-end module, detects to received signal then and adjudicates and give processing module with test results report, and the control command that it also must receiving processing module is to determine mode of operation simultaneously.This module is made of a CPU process chip and a storage chip, the CPU process chip is used present flush bonding processor and embedded handling procedure, wherein including with energy measuring and feature detection at least is the program of principle, the detection and the judgement of collecting mail to achieve a butt joint number.Storage chip is the storage system of this module, utilizes the Flash storage chip in the present embedded system, realizes the storage to the cyclo-stationary cyclophysis of the signal of certain sample size and the wireless signal that need avoid.
Processing module is by receiving the detection discriminative information of detection module, and information is handled and classified, then forward end module and detection module transmitting control commands.This module is made of a CPU process chip and a storage chip equally, the CPU process chip is used flush bonding processor and embedded handling procedure, realization is to the acceptance and the classification of detection module discriminative information, its handling procedure information of can accepting a judgement, the kind of identification discriminative information, forward end module and detection module transmitting control commands simultaneously; Storage chip is the storage system of this module, utilizes the Flash storage chip in the present embedded system, realizes the storage to various information in the band information that can dynamically insert in the whole digital household environment and the processing module.
Be illustrated in figure 2 as the flow chart that wireless device avoids interference in digital household environment, its flow process is as follows:
1, front-end module periodically receives the signal in this wireless device working frequency range, and the signal that receives is passed to detection module in the wireless device.
2, detection module judges whether to exist household electrical appliance to disturb, and decision signal is sent to processing module by energy detection module.If there are household electrical appliance to disturb, processing module forward end module transmitting control commands makes it switch frequency range, and continues received signal.
If 3 do not have household electrical appliance to disturb, processing module makes the feature detection module work in the detection module to the detection module transmitting control commands, judges whether to exist the interference of other wireless devices, and says that decision signal delivers to processing module.
If 4 have the interference of other wireless devices, processing module forward end module transmitting control commands makes it switch frequency range, and continues received signal.
If 5 do not have the interference of other wireless devices, processing module forward end module transmitting control commands stops received signal, begins to transmit data.
Fig. 3 is the fundamental diagram of energy detection module among Fig. 1, and the concrete steps of its work are as follows:
1, the broadband signal X (t) that receives is passed through band pass filter, obtain the signal y (t) in the desired frequency band
2, y (t) is passed through square law device, obtain the estimation y of signal power in the desired frequency band
2(t)
3, with y
2(t) input integral device obtains in certain observation cycle T, and the size of this in-band signal energy is:
4, with in the observation cycle T, the size of this in-band signal energy compares as test statistics and a certain thresholding Λ, judges whether to exist signal.
Feature detection module work principle as shown in Figure 4, the concrete steps of its work are as follows:
1, obtaining its spectrum correlation function (SCF) to received signal is:
Wherein the finite time Fourier transform is:
Spectrum correlation function (SCF) is otherwise known as to circulate and composes, and wherein α is a cycle frequency.
The circulation that 2, will calculate spectrum is carried out feature detection, promptly with detection module in the circulation spectrum of the wireless signal avoided of the needs of memory module the inside storage compare.If the circulation spectrum of coupling is arranged, the interference of other wireless devices is then arranged; If do not have the circulation spectrum of coupling, then do not have the interference of other wireless devices.
The input/output function figure of processing module as shown in Figure 5, the concrete steps of its work are as follows:
When 1, wireless device had just been started working, processing module was to detection module output services pattern: energy measuring, feature detection; And output control information of forward end module and band information, make front-end module begin received signal in the frequency range of processing module appointment;
If 2 have the household electrical appliance interference and have other wireless devices to disturb, return mode of operation to detection module: energy measuring; The forward end module is returned control information and band information, and the frequency range that makes front-end module switch to the processing module appointment continues received signal;
If 3 have the household electrical appliance interference and do not have other wireless devices interference, return mode of operation to detection module: energy measuring; The forward end module is returned control information and band information, and the frequency range that makes front-end module switch to the processing module appointment continues received signal;
If 4 do not have the household electrical appliance interference and have other wireless devices to disturb, return mode of operation to detection module: feature detection; Processing module forward end module is returned control information and band information, and the frequency range that makes front-end module switch to the processing module appointment continues received signal;
If 5 do not have the household electrical appliance interference and do not have other wireless devices interference, return mode of operation to detection module: energy measuring; The forward end module is returned control information and band information: make front-end module in current band transmissions data.
Claims (6)
1, the method that wireless device avoids external device to disturb in the digital home, described external device comprise household electrical appliance and other wireless devices except that this equipment, it is characterized in that this method comprises the steps:
(1) at first in digital household environment by the front-end module in the wireless device, periodically receive this wireless device work
Signal in the frequency range, and the signal that receives passed to detection module in the wireless device;
(2) detection module judges whether to exist the interference of household electrical appliance and other wireless devices by the method for energy measuring and feature detection, and decision signal is sent to processing module;
(3) processing module according to decision signal to detection module and front-end module transmitting control commands;
(4) front-end module and detection module are adjusted mode of operation according to the control command that processing module sends, and the frequency range that makes this wireless device avoid being disturbed is carried out transfer of data.
2, method according to claim 1 is characterized in that the front-end module of step (1) controls the radio frequency bandwidth of whole wireless device work, and the wide band radio-frequency that this front-end module has is set in 8～10 octaves, and can carry out tuning and energy control.
3, method according to claim 1 is characterized in that the described detection module of step (2) comprises:
Energy detection module, this module is analyzed to received signal and handled by energy detection algorithm to judge whether to exist the interference of household electrical appliance to wireless device: at first energy detection module is handled the signal that receives the signal that obtains in the desired frequency band, then this signal is carried out square and in the observation time of setting, carry out integration, the energy value of picked up signal, at last the energy value of acquisition and the threshold value of setting are compared, if the energy value that obtains is greater than threshold value, show the existence that has household electrical appliance to disturb, if the energy value that obtains is less than or equal to threshold value, then there are not household electrical appliance to disturb;
The feature detection module, this module utilization circulation spectral density function feature is finished: the feature detection module is obtained the spectrum correlation function of received signal, and according to the different different cyclo-stationary signals of circulation spectrum difference, thereby realization is to the differentiation of various wireless signals in the digital home.
4, method according to claim 1 is characterized in that the described processing module of step (3) receives the detection discriminative information of detection module, and to detecting discriminative information classify processing, forward end module and detection module transmitting control commands then; Described classification comprises: have household electrical appliance to disturb and other wireless devices interference; There are household electrical appliance to disturb but do not have other wireless devices and disturb; No household electrical appliance disturb but have other wireless devices to disturb; The interference of no household electrical appliance and other wireless devices.
5, method according to claim 4, it is characterized in that the control command that processing module forward end module sends in the step (3) comprises: the household electrical appliance interference is arranged or have other wireless devices to disturb if the detection discriminative information that receives shows current frequency range, include the required information of frequency range of switching in the control command that processing module forward end module sends, this information comprises band bandwidth, frequency range occupancy and switches maximum delay; Do not have household electrical appliance to disturb and do not have the interference of other wireless devices if the detection discriminative information that receives shows current frequency range, then processing module forward end module sends the order of transmitting data command and periodically receiving the signal in this wireless device working frequency range.
6, method according to claim 4 is characterized in that processing module comprises to the control command that detection module sends: open the energy detection module order if having household electrical appliance to disturb then send; If do not have household electrical appliance to disturb but have other wireless devices to disturb, then send the order of access opening feature detection module; Do not have other wireless devices to disturb if both there have been household electrical appliance to disturb yet, and then sent and open the energy detection module order.
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Cited By (6)
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| CN102364974A (en) * | 2011-10-12 | 2012-02-29 | 广州杰赛科技股份有限公司 | Anti-jamming and wireless environment monitoring wireless access point system and implementation method thereof |
| CN102611511A (en) * | 2011-12-31 | 2012-07-25 | 中国科学技术大学 | Wireless signal detection method based on enhanced frequency spectrum correlation function |
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| US7196623B1 (en) * | 2003-09-17 | 2007-03-27 | Wang Matthew C | Remote reminding system |
| CN201145949Y (en) * | 2007-04-27 | 2008-11-05 | 上海贝岭矽创微电子有限公司 | Household image and sound wireless transmission device with tamper-proof function |
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| CN102364974A (en) * | 2011-10-12 | 2012-02-29 | 广州杰赛科技股份有限公司 | Anti-jamming and wireless environment monitoring wireless access point system and implementation method thereof |
| CN102611511A (en) * | 2011-12-31 | 2012-07-25 | 中国科学技术大学 | Wireless signal detection method based on enhanced frequency spectrum correlation function |
| CN102611511B (en) * | 2011-12-31 | 2014-11-05 | 中国科学技术大学 | Wireless signal detection method based on enhanced frequency spectrum correlation function |
| CN105792257A (en) * | 2016-03-09 | 2016-07-20 | 上海斐讯数据通信技术有限公司 | Adaptive wireless receiving method and apparatus of wireless local area network |
| CN105792257B (en) * | 2016-03-09 | 2019-10-25 | 上海斐讯数据通信技术有限公司 | A kind of WLAN adaptive wireless method of reseptance and device |
| CN107623526A (en) * | 2017-08-24 | 2018-01-23 | 深圳市盛路物联通讯技术有限公司 | A kind of method and communication terminal for adjusting antenna receiving sensitivity |
| CN107623526B (en) * | 2017-08-24 | 2019-11-19 | 深圳市盛路物联通讯技术有限公司 | A kind of method and communication terminal adjusting antenna receiving sensitivity |
| CN108963424A (en) * | 2018-07-13 | 2018-12-07 | Oppo广东移动通信有限公司 | Antenna match control method and terminal device |
| CN111281316A (en) * | 2020-01-15 | 2020-06-16 | 安翰科技(武汉)股份有限公司 | Control method and system for capsule endoscope, electronic device and readable storage medium |
| US11582386B2 (en) | 2020-01-15 | 2023-02-14 | Ankon Technologies Co., Ltd. | Control method, control system, electronic device and readable storage medium for capsule endoscope |
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