CN101345535B - Information transmission method in wireless individual domain network medical scene based on frequency spectrum perception technology - Google Patents
Information transmission method in wireless individual domain network medical scene based on frequency spectrum perception technology Download PDFInfo
- Publication number
- CN101345535B CN101345535B CN2008100419236A CN200810041923A CN101345535B CN 101345535 B CN101345535 B CN 101345535B CN 2008100419236 A CN2008100419236 A CN 2008100419236A CN 200810041923 A CN200810041923 A CN 200810041923A CN 101345535 B CN101345535 B CN 101345535B
- Authority
- CN
- China
- Prior art keywords
- node
- area network
- frequency spectrum
- signal
- body area
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The invention relates to information transmission method for radio body area network medical scene based on spectrum sensing technology of radio communication technology field. In the invention, each node of radio body area network roughly detects interested spectrum range segment to alarm and mark latent spectrum cavity, and then finely detects marked and alarmed latent spectrum cavity, calculates signal-noise ratio of each latent spectrum cavity and further confirms usability of the spectrum cavity. The spectrum cavity performance parameter which each node detects and the node position composition information are transmitted among all nodes of body channel in body area network. Each node compares transmission performance of every spectrum cavity in interested spectrum range and finds spectrum cavity of most excellent transmission performance and detects the node position of the cavity. The invention fully combines characteristic of radio body area network mixed channel, exert superiority of cooperative spectrum detection, possesses good transmission property, saves spectrum register fee.
Description
Technical field
What the present invention relates to is a kind of method of wireless communication technology field, specifically is a kind of based on information transferring method in the frequency spectrum perception technology wireless body area network medical scene.
Background technology
With wireless technology the frequency spectrum resource demand is constantly increased this contradiction at assignable frequency spectrum resource is rare day by day, the cognitive radio technology (Cognitive Radio wireless transmission) of attempting searching usable spectrum cavity in the frequency spectrum that has distributed (Licensed spectrum) begins to be widely used.Though be assigned with but in time or spatial dimension, do not have the frequency range of transfer of data to be called as frequency spectrum cavity-pocket.The development that extensively exists for cognitive radio technology of frequency spectrum cavity-pocket provides may.Cognition wireless is found out the data that the available spectrum cavity is used for transmitting cognitive user (cognitive user) in the frequency spectrum (Licensedspectrum) of the registration by main users just under the prerequisite that does not influence main users (Licensed user) transfer of data.Wireless body area network constitutes network by the wireless device that is attached to human body surface to be transmitted alternately in body area network and outside the body area network with the information around the human body and with information.According to the difference of data content, the application of wireless body area network can be divided into medical science and non-medical field.The application of wireless body area network medical domain mainly is the wireless device human body physiologic information that is placed on human body surface by subsides, and the health status of coming the remote monitoring human body by antenna transmission to medical centre.Mixed channel in the wireless body area network medical application scene comprises the wireless channel of the wireless space formation that human body is outer and the human body channel that human body itself constitutes.Because radio transmission apparatus is close to human body surface in the body area network, so the signal transmission power of wireless channel in the wireless body area network, parameters such as the center frequency point of signal work and data transfer bandwidth all have been subjected to constraint.A lot of scholars have carried out extensive and deep research to the transmission characteristic of human body channel, and confirm by experiment: by the length of control human body channel, when in human body channel, transmitting the modulation signal of particular frequency range and performance number scope, the received signal error rate, parameters such as pulse stretching and amplitude fading can satisfy some business need.
Aspect the realization of frequency spectrum detecting method, people such as Danijela Cabric be published in that " Implementation Issues in spectrum sensing for cognitive radio " (" problem of implementation of cognitive radio intermediate frequency spectrum perception ") on the IEEE magazine detects energy detection method, cycle specificity and cognitive radio such as cooperative frequency spectrum detection in the implementation procedure of frequency spectrum detecting method commonly used be described in detail.Aspect the research of human body channel transmission characteristic, people such as Namjun Cho be published in " The human bodycharacteristic as a signal transmission medium for intra-bodycommunication " on the IEEE (" human body as the transmission medium of communicating by letter in the body time transmission characteristic ") to carrier frequency below 4MHZ, transmission characteristics such as human body channel amplitude fading and phase place time-delay are studied, and measure by experiment at specific data bandwidth, under working frequency points and the human body channel length, when utilizing information such as human body channel transmission electrocardiogram, the error ratio characteristic of received signal, tentatively proved human body channel to data speed not too high data service support.
Find through retrieval the prior art document, people such as Wha Sook Jeon deliver " An efficient quiet period management scheme for cognitive radio system " (" a kind of quiet hour segment management strategy in the cognitive radio ") on the IEEE magazine, this article mainly is when utilizing Markov link analysis method proof formerly to utilize multiple energy to detect to find out the two-stage frequency spectrum detection operation that utilizes cycle specificity to detect again behind the possible frequency spectrum cavity-pocket these frequency spectrum cavity-pockets are further confirmed, the number of times by adjusting energy measuring can be effectively must and improve between the accuracy of frequency spectrum detection and carry out balance in the detection time that shortens the two-stage frequency spectrum detecting method.Though this article combines the short and high advantage of cycle specificity detection accuracy of energy detection method time, the method that provides in the literary composition needs constantly to adjust the complexity of number of times when realizing of energy measuring than higher.Simultaneously, for the wireless channel that shadow fading extensively exists, do not consider that how adopting cooperative frequency spectrum to detect in the method effectively resists shadow fading yet.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, propose a kind of based on information transferring method in the frequency spectrum perception technology wireless body area network medical scene, by the frequency spectrum perception technology in the cognitive radio is applied in the wireless body area network, to find out the transfer of data that frequency spectrum cavity-pocket is used for wireless body area network in the frequency spectrum resource distributing, simultaneously to how with the transfer of data in the wireless body area network when this uncharted field is studied to body area network outside, taken into full account the transmission characteristic of the mixed channel of wireless channel and human body channel composition in the wireless body area network medical scene and the correlation of interior each the node data content of wireless body area network.
The present invention is achieved by the following technical solutions, the present invention includes following steps:
Step 4, all node stop frequency spectrum perception in the wireless body area network, the node that is positioned at the body area network edge begin to send the frequency spectrum cavity-pocket information that this node detection goes out by human body channel to its adjacent node and comprise the signal to noise ratio of frequency, frequency spectrum cavity-pocket and the perceptual parameters such as data transmission times of support;
Step 5, the frequency spectrum cavity-pocket information that frequency spectrum cavity-pocket information and this section point from adjacent node that each non-fringe node will receive detects is that unit compares one by one by little frequency range, and the less frequency spectrum cavity-pocket information of signal to noise ratio in each little frequency range is added that its positional information is transferred to next node;
Step 6, last node finish the frequency spectrum cavity-pocket parameter relatively after, in body area network along transmit in the other direction this frequency spectrum detection intact after on each little frequency range optimum frequency spectrum cavity-pocket information and can detect the node location of this parameter;
Step 7, each node utilizes human body channel that own detected information is transmitted to the node that can detect optimum frequency spectrum cavity-pocket information according to the mode of increment, behind the number of transmissions by appointment in this node completing steps three, all nodes in the wireless body area network enter the next round frequency spectrum detection.
In the step 1, the described spectral range that needs the signal of perception, be meant around human body or transmit in the human body when utilizing these frequency transmission data and neither can bring any injury can not influence the set of all wireless frequencies of wireless device small size designing requirement in the wireless body area network again to human body, this frequency range be a nonvoid subset of wireless frequency spectrum.
In the step 1, described little frequency range is the minimum continuous frequency range that satisfies the data traffic transmission bandwidth demand in the body area network.The design of the frequency bandwidth of the Transmit Receive Unit of each node also must be closely designs with reference to the bandwidth value of each little frequency range in the body area network.
In the step 1, described predefined energy threshold is to occur but signal energy when more weak according to the signal that main users is arranged in each little frequency range, and the interior energy value of this little frequency range this moment of utilizing energy detection method to calculate is as pre-set threshold.Though pre-set threshold should be along with the difference of signal real-time change, this threshold value is the fixed value by measuring in advance in the present invention.
In the step 1, described rough detection is the energy detection method that adopts in the frequency spectrum perception technology, in the hope of being that unit finishes the detection to the signal energy in the spectral range that needs perception with little frequency range rapidly at short notice, tentatively finds out the available spectrum cavity.
In the step 2, described examining is surveyed, adopt the signal cycle characteristic detection method in the cognitive radio, signal in the frequency spectrum cavity-pocket that rough detection is come out is further analyzed, to obtain avoiding only depending on the higher defective of false alarm probability of the detected frequency spectrum cavity-pocket of energy detection method than higher accuracy.
In the step 3, described two energy value estimation channel characteristics degrees of correlation that obtain according to rough detection, be specially: under the prerequisite that keeps equating in the approximate time interval of thinking any double energy measuring, the absolute value of the signal energy difference that double energy measuring is obtained is as the criterion of the channel characteristics degree of correlation, the absolute value that is the signal energy difference is big more, correlation between channels is more little, and the pace of change of channel is fast more.
In the step 3, the described number of times of judging the largest data transfer that the detected frequency spectrum cavity-pocket of this perception can be supported according to the degree of correlation, be specially: the rate of change of determining channel by the channel degree of correlation of equal time, suppose that then channel variation rate remains unchanged at short notice, go to estimate the life period in usable spectrum cavity with this speed, just can estimate the data transmission times that this energy measuring can be supported according to the time of finishing a data transfer in the wireless body area network at last.
In the step 3, described judge according to the degree of correlation its objective is the number of times of the largest data transfer that the detected frequency spectrum cavity-pocket of this perception can be supported to avoiding all nodes in the wireless body area network (for the main users that has wireless frequency spectrum, being Secondary Users) to interfere with the normal transfer of data of the main users that has wireless frequency spectrum when utilizing frequency spectrum cavity-pocket to carry out transfer of data.
In the step 4, all nodes in the described wireless body area network, be meant all wireless devices that are attached to human body surface, the distance of adjacent two wireless devices is determined with reference to utilizing human body channel to carry out effective channel transmitted length range in the wireless body area network, these wireless devices are formed linear list on human body, except chained list two nodes from beginning to end can only be undertaken the exchanges data by a human body channel and an adjacent node on every side, middle each radio node can carry out exchanges data by human body channel with two the adjacent nodes around it.
In the step 7, described all nodes carry out transfer of data according to the mode of increment, its foundation is that all nodes all are to design for the input that satisfies identical function in the wireless body area network, like this, on the one hand, detected information has bigger correlation, on the other hand, because the position difference of placing, each node detection to information show as less difference again.
In the step 7, described incremental transmission operation, be meant that the information that the body area network fringe node sends can be by this fringe node and the middle complete forwarding of all nodes of the node that can detect optimum frequency spectrum cavity-pocket, simultaneously, these middle nodes also arrive next adjacent node as the difference that reference information calculates between own detected information and fringe node information as the incremental transmission of this nodal information with the information of fringe node, and the increment information that each node all can this node of complete forwarding receives.
Compared with prior art, the present invention has following beneficial effect:
1. adopt the frequency spectrum perception technology in existing registered frequency spectrum, to detect the expense that way that frequency spectrum cavity-pocket transmits data has been saved a large amount of new frequency spectrums of application for registration for the application of wireless body area network medical domain;
2. among the present invention rough detection and examining survey are applied to frequency spectrum detection simultaneously, can bring into play the fireballing advantage of energy measuring and can bring into play signal cycle feature detection advantage of high accuracy again;
3. the present invention realizes that by human body channel cooperative frequency spectrum detects, and find the method for global optimum's frequency spectrum cavity-pocket in the wireless body area network, can effectively resist in the wireless human body medical scene because human body frequently moves the shadow fading that extensively exists in the wireless channel around the people.
4. wireless body area network is by controlling the achievable data transmission times of each frequency spectrum detection to the estimation of channel variation, not only guaranteed that all sensing nodes in the wireless body area network are as the effectively transmission but also avoided conflicting with the main users transfer of data in the wireless frequency spectrum by the number of transmissions of controlling all nodes of the data of Secondary Users in the wireless frequency spectrum;
5. at the correlation of each node data content in the wireless body area network, interior each the internodal message transmission of wireless body area network adopts incremental mode not only to keep the otherness of all node datas in the wireless body area network but also avoided all users of complete transmission to detect the needs of information among the present invention.
Description of drawings
Fig. 1 is all node distribution scenes in the wireless body area network;
Fig. 2 is a wireless body area network frequency spectrum perception rough detection method flow diagram;
Fig. 3 is that method flow diagram is surveyed in the examining of wireless body area network frequency spectrum perception;
Fig. 4 is channel-aware parameter transmission line figure in the wireless body area network;
Wherein: figure (a) is node A
1Initiate channel parameter and share transmitting scene, figure (b) is node A
1To node A
7Frequency spectrum perception data transmission link figure, figure (c) is node A
7The line map that optimum frequency spectrum perception parameter is shared;
Fig. 5 is wireless body area network interior nodes information transmission line figure;
Fig. 6 is that wireless body area network inward flange nodal information sends block diagram;
Fig. 7 is transferred to the outer block diagram of human body for all nodal informations in the wireless body area network;
Wherein: figure (a) is a data frame structure in the wireless body area network, and figure (b) is a wireless body area network intermediate node message processing module block diagram, and figure (c) utilizes frequency spectrum cavity-pocket transmission data block diagram for wireless body area network.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
In the present embodiment, each wireless device pastes the different parts that is placed on human body according to specific required distance and works in coordination with and finish frequency spectrum perception, the function of information gathering and transmission in the wireless body area network.Adjacent wireless device is placed distance need satisfy following two conditions: the first, and each wireless device spacing will be enough far to guarantee the detected frequency spectrum cavity-pocket information of each wireless device and to collect human body information having independence.The second, the spacing of each wireless device want closer with the control human body channel to the wherein amplitude fading and the signal broadening of information transmitted.
As shown in Figure 1, total A in the wireless body area network
1...., A
7Deng seven nodes, fringe node is A
1And A
7, consider that human body channel obviously increases with the decay that distance increases signal, so each internodal distance is controlled in the 40cm.Like this, node A
1Only can with A
2Directly carry out information exchange by human body channel, and since with node A
3Spacing too far away and can't directly carry out data interaction by human body channel.A
2Can with A
1And A
3Carry out information interaction, but can't with A
1And A
3Other outer nodes carry out direct data interaction.The characteristics of above-mentioned data interaction are equally applicable to other nodes in this body area network.
Present embodiment comprises the steps:
As shown in Figure 2, the node in the wireless body area network is provided with parameters such as the center frequency point of antenna and data bandwidth by radio-frequency module.The data that antenna receives are converted into digital signal to analog signal through digital-to-analogue conversion, and digital signal transforms to frequency domain through FFT and passes through the ENERGY E of frequency domain summation module signal calculated
iSuppose that the energy threshold of setting is E
TIf, E
iE
T, the parameter that system adjusts radio-frequency module according to branch road 1 makes reception antenna carry out energy measuring to the little frequency range of the next one; If E
i＜E
T, system enters the FFT conversion according to branch road 2 and begins energy measuring for the second time.If the value E of energy measuring for the second time
i＜E
T, program just enters alarm flag according to branch road 3, has the frequency spectrum cavity-pocket of supporting available data bandwidth to show this frequency, and simultaneity factor also can the little frequency range Continuous Energy of retention marker alarm detect two energy values that obtain.Afterwards, the parameter that system adjusts wireless radio frequency modules changes next little frequency range over to, in finishing the frequency spectrum perception frequency range till all little frequency range rough detection.
As shown in Figure 3, after the A/D sampling of signal process and N point FFT conversion in the little frequency range of mark alarm, do circular correlation according to the parameter alpha of setting in the frequency domain segmentation, the FFT conversion when carrier modulation that adopts during owing to the signal transmission and reception makes the frequency spectrum of signal show stronger circular dependency.When doing circular correlation, signal spectrum is launched on the two-dimensional space that α-f constitutes by introducing parameter alpha.Among the figure (3), by according to signal and characteristics of noise both being distinguished in the signal characteristic leaching process, and carry out signal to noise ratio and the number of transmissions calculates, accurately calculate the signal to noise ratio snr in the i little frequency range
i, and with the signal to noise ratio snr that calculates
iSignal to noise ratio snr with initial setting
TCompare, if SNR
i＜SNR
T, then think to have frequency spectrum cavity-pocket in this frequency range.
Step 4, all node stop frequency spectrum perception in the wireless body area network, the node that is positioned at the body area network edge begins to send the frequency spectrum cavity-pocket information that this node detection goes out by human body channel to its adjacent node, comprises the signal to noise ratio of frequency, frequency spectrum cavity-pocket and the perceptual parameters such as data transmission times of support;
Step 5, the frequency spectrum cavity-pocket information that frequency spectrum cavity-pocket information and this section point from adjacent node that each non-fringe node will receive detects is that unit compares one by one by little frequency range, and the less frequency spectrum cavity-pocket information of signal to noise ratio in each little frequency range is added that its positional information is transferred to next node;
Step 6, last node finish the frequency spectrum cavity-pocket parameter relatively after, in body area network along transmit in the other direction this frequency spectrum detection intact after on each little frequency range optimum frequency spectrum cavity-pocket information and can detect the node location of this parameter;
The process of above-mentioned steps four, five, six as shown in Figure 4, among Fig. 4 (a), wireless body area network inward flange node A
1Begin to be stored in A by human body channel
1In the frequency spectrum perception message transmission to A
2Node.A
2Node receives A
1Information after to A in each little frequency range
1Frequency spectrum perception information and A
2Frequency spectrum perception information compare, and will be preferably frequency spectrum perception information continue to transfer to A forward
3, all nodes in wireless body area network according to the circuit shown in Fig. 4 (b) finish frequency spectrum perception information relatively after, A
7In will store the optimal transmission performance each frequency spectrum cavity-pocket information and can detect the node location information of this frequency spectrum cavity-pocket.Node A
7Begin then according to shown in the chart 4 (c), A
7In optimum frequency spectrum perception information and the node location that can detect this information in wireless body area network, transmit.
Step 7, each node utilizes human body channel that own detected information is transmitted to the node that can detect optimum frequency spectrum cavity-pocket information according to the mode of increment, behind the number of transmissions by appointment in this node completing steps three, all nodes in the wireless body area network enter the next round frequency spectrum detection, and are specific as follows:
As shown in Figure 5, suppose A
3The transmission performance of a certain little frequency range that node detection arrives is best, and all nodes in the wireless body area network begin own detected information by human body channel to node A
3Transmission it may be noted that A
3No longer only being responsible for carrying out information detection functions this moment will be from the message transmission of other node outside body area network.Concrete transmission course can be introduced in follow-up figure in detail.
As shown in Figure 6, node in the wireless body area network at first extracts physiologic information, physiologic information is an electrical signal form, carrying out quantization operation then is the signal amplitude of limited number with the signal quantization of amplitude continually varying, but through the conversion of signals of the signal of quantization operation being carried out after the pulse-width modulation by original changes in amplitude is the signal that the constant pulsewidth of signal amplitude constantly changes, and carrier modulation is carried out in the generation of process local carrier, be transformed into the intermediate-freuqncy signal that Human Physiology can be born, and send in the human body by transmitting terminal, make intermediate-freuqncy signal utilize human body channel to carry out transfer of data.
Shown in Fig. 7 (a), be the time domain frame structure of transfer of data in the wireless body area network, in Fig. 7 (b)
Representing reference information in the body area network, is the direct detected information of fringe node.Because
Amount of information bigger, so partial information has been assigned with long transmission time slot in frame structure.Δ in the frame structure
jJ=1 ..., 7 for the detected information of intermediate node be the increment that reference calculation is come out with the information of fringe node.Because each node is that data service to identical content detects in the body area network, therefore in the body area network all node detection to data bigger correlation is arranged, so the data volume of middle each node increment information is fewer, in frame structure, be assigned to short time slot.Design during frame structure for the data sync that guarantees each frame receiving terminal especially every frame begin added synchronous head and be convenient to system and obtain the time synchronized in the control module in the follow-up way.For the transmitting scene that provides among Fig. 5, A
1And A
2Frame structure in
Be identical, different places is A
1Δ in the frame structure
jInformation all is 0, and A
2Frame structure in except Δ
2The position data be not entirely zero outer remaining the time Δ
j, j=1 ..., the information at place, 7 and j ≠ 2 cracks is 0.Node A
4, A
5, A
6, A
7Frame structure in
Location transmission be A
7Detected information.A
7Frame structure in Δ
jJ=1 ..., 7 are 0, A
6Δ in the frame structure
jJ=1 ..., 7 except j=6 be not that remaining increment is 00.A
5Δ in the frame
jExcept j=5, be 0 outside 6 the position.A
4Δ in the frame
jExcept j=4,5,6 are 0 outward.
Shown in Fig. 7 (b), PCB (the printedcircuit board of wireless body area network intermediate node by being attached to human body surface, printed circuit board) receiving terminal of design receives the information of the next neighboring user of human body Channel Transmission, then the signal amplitude of carrying out is amplified to overcome the decay of human body channel to signal amplitude, be convenient to the PWM demodulation of back, the signal that amplified is moved low frequency through behind the intermediate frequency demodulation, passes through PWM (pulse-width modulation) demodulation at last and obtains data x (n).Control 1 end of signal receiving node can find data synchronization information according to the synchronous head in the Frame, and control module can be controlled the output of x (n) data according to synchronizing information and select to reach the reference signal in the frame structure between two branch roads
With all the other nodes with respect to
The increment information Δ
j, j=1 ..., 7 select output.Though it is to be noted the increment information Δ that comprises this node in control in the branch road 1
j, but owing to the increment of this node is not calculated, so Δ
jValue be 0.In the control branch road 2 in Fig. 7 (b), receiving node comes out according to recovery
One side is calculated increment Delta with the information S (n) that this section point detects
i, in control branch road 2, recover the reference information of coming out on the other hand
Can continue transmission forward by the delay unit of control branch road 3.Simultaneously, the increment information Δ that from x (n), extracts
j, j=1 ..., 7 can be retained and by continuing transmission forward behind the delay unit.Controlling 2 ends can be according to the Δ of controlling in the branch road 2 of the data frame structure in the body area network
iReplace branch road 1 Δ
j, j=1 ..., Δ in 7
i, all the other increment informations remain unchanged and form new increment information, then the reference information that provides in these increment informations and the branch road 3 are formed new Frame according to data frame structure
Convert x (t) to by data transmission blocks and continue transmission forward along human body channel.Data transmission blocks realizes is by being modulated to function between transmitting terminal from PWM among Fig. 6.
Fig. 7 (c) is depicted as the node A among Fig. 5
3Utilize the detected frequency spectrum cavity-pocket of this node outwards to transmit the data block diagram.Receiving terminal 1 receives from node A
1, A
2The information x that transmits
1(t), receiving terminal 2 receives from A
4, A
5, A
6, A
7Signal transmitted x
2(t), demodulation module is realized the function from x (t) to operation the x (n) among Fig. 7 (b), x
1(t) and x
2(t) be demodulated into x respectively
1(n) and x
2(n), then control module according to data frame length in the body area network x
1(n) frame in and x
2(n) frame in quantity such as is pressed and is formed x (n) in the back alternately.X (n) Frame sends to wireless space through modulation module.The modulation module here is different from the modulation module of front, this modulation module mainly be how data-modulated on the frequency spectrum cavity-pocket available data bandwidth, send to wireless space then.
Claims (5)
1. one kind is utilized the method for mixed channel in wireless body area network transmission data based on cognition technology, it is characterized in that, may further comprise the steps:
Step 1, each node will need the spectral range of the signal of perception in the wireless body area network, be divided into plural little frequency range segmentation, utilize the energy detection method in the frequency spectrum perception technology to carry out each little in-band signal energy of rough detection, the signal energy that twice rough detection obtained all is lower than the little frequency range mark alarm of predefined energy threshold, and preserves two energy values of the little frequency range of mark alarm;
Step 2, adopt the examining of the signal cycle characteristic detection method in the cognitive radio to survey to the signal in the little frequency range of mark alarm, it is that energy value that signal characteristic according to signal component in each little frequency range and noise component(s) calculates two components respectively draws the signal to noise ratio in this little frequency range that examining is surveyed, signal to noise ratio is confirmed as the usable spectrum cavity less than the little frequency range of predefined signal to noise ratio, and predefined signal to noise ratio is the maximum of the signal to noise ratio measured when not having the main users signal to occur in this little frequency range;
Step 3, two energy values estimation channel characteristics degrees of correlation that calculate when the rough detection according to the little frequency range of confirming as frequency spectrum cavity-pocket, and judge the number of times of the largest data transfer that the detected frequency spectrum cavity-pocket of this perception can be supported according to this degree of correlation;
Step 4, all node stop frequency spectrum perception in the wireless body area network, the node that is positioned at the body area network edge begin to send the frequency spectrum cavity-pocket information that this node detection that is positioned at the body area network edge goes out by human body channel to its adjacent node and comprise the signal to noise ratio of frequency, frequency spectrum cavity-pocket and the data transmission times of support;
All nodes in the described wireless body area network, be meant all wireless devices that are attached to human body surface, the distance of adjacent two wireless devices is determined with reference to utilizing human body channel to carry out effective channel transmitted length range in the wireless body area network, these wireless devices are formed linear list on human body, except chained list two nodes from beginning to end can only be undertaken the exchanges data by a human body channel and an adjacent node on every side, middle each radio node can carry out exchanges data by human body channel with two the adjacent nodes around it;
Step 5, the frequency spectrum cavity-pocket information that frequency spectrum cavity-pocket information and this section point from adjacent node that each non-fringe node will receive detects is that unit compares one by one by little frequency range, and the less frequency spectrum cavity-pocket information of signal to noise ratio in each little frequency range is added that its positional information is transferred to the adjacent node of this non-fringe node;
Step 6, last node finish the frequency spectrum cavity-pocket parameter relatively after, in body area network along transmit in the other direction this frequency spectrum detection intact after on each little frequency range optimum frequency spectrum cavity-pocket information and can detect the node location of this parameter;
Step 7, each node utilizes human body channel that own detected information is transmitted to the node that can detect optimum frequency spectrum cavity-pocket information according to the mode of increment, behind the number of transmissions by appointment in this node completing steps three, all nodes in the wireless body area network enter the next round frequency spectrum detection.
2. the method for utilizing wireless body area network mixed channel transmission data based on cognition technology according to claim 1, it is characterized in that, in the step 1, the described spectral range that needs the signal of perception, be meant around human body or transmit in the human body when utilizing these frequency transmission data and neither can bring any injury can not influence the set of all wireless frequencies of wireless device small size designing requirement in the wireless body area network again to human body, this frequency range be a nonvoid subset of wireless frequency spectrum.
3. the method for utilizing wireless body area network mixed channel transmission data based on cognition technology according to claim 1, it is characterized in that, in the step 3, described two energy value estimation channel characteristics degrees of correlation that obtain according to rough detection, be specially: under the prerequisite that the approximate time interval of thinking any double energy measuring keeps equating, the absolute value of the signal energy difference that double energy measuring is obtained is as the criterion of the channel characteristics degree of correlation, the absolute value that is the signal energy difference is big more, correlation between channels is more little, and the pace of change of channel is fast more.
4. the method for utilizing wireless body area network mixed channel transmission data based on cognition technology according to claim 1, it is characterized in that, in the step 3, the described number of times of judging the largest data transfer that the detected frequency spectrum cavity-pocket of this perception can be supported according to the degree of correlation, be specially: the rate of change of determining channel by the channel degree of correlation of equal time, suppose that then channel variation rate remains unchanged at short notice, go to estimate the life period in usable spectrum cavity with this speed, just can estimate the data transmission times that this energy measuring can be supported according to the time of finishing a data transfer in the wireless body area network at last.
5. the method for utilizing wireless body area network mixed channel transmission data based on cognition technology according to claim 1, it is characterized in that, in the step 7, described incremental transmission operation, be meant that the information that the body area network fringe node sends can be by this fringe node and the middle complete forwarding of all nodes of the node that can detect optimum frequency spectrum cavity-pocket, simultaneously, these middle nodes also arrive next adjacent node as the difference that reference information calculates between own detected information and fringe node information as the incremental transmission of this nodal information with the information of fringe node, and these increment informations of forwarding that all nodes all can be complete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100419236A CN101345535B (en) | 2008-08-21 | 2008-08-21 | Information transmission method in wireless individual domain network medical scene based on frequency spectrum perception technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100419236A CN101345535B (en) | 2008-08-21 | 2008-08-21 | Information transmission method in wireless individual domain network medical scene based on frequency spectrum perception technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101345535A CN101345535A (en) | 2009-01-14 |
| CN101345535B true CN101345535B (en) | 2011-09-28 |
Family
ID=40247444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100419236A Expired - Fee Related CN101345535B (en) | 2008-08-21 | 2008-08-21 | Information transmission method in wireless individual domain network medical scene based on frequency spectrum perception technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101345535B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101753231B (en) * | 2009-12-24 | 2012-11-28 | 上海交通大学 | Method for dynamically detecting frequency spectrum in cognitive radio electrotape |
| WO2012037637A1 (en) * | 2010-09-23 | 2012-03-29 | Research In Motion Limited | System and method for dynamic coordination of radio resources usage in a wireless network environment |
| CN103326791B (en) * | 2013-05-16 | 2015-08-05 | 吉林大学 | A kind of physiological data collection method for tele-medicine |
| CN104184526B (en) * | 2013-05-23 | 2018-05-01 | 北京邮电大学 | The two step cognitive radio frequency spectrum detection methods based on optimal detection thresholding |
| CN103313286B (en) * | 2013-07-04 | 2016-01-20 | 吉林大学 | Body area network network system node data transmission conflict estimation & disposing method |
| CN103441779B (en) * | 2013-09-22 | 2019-05-21 | 深圳市研谱科技有限公司 | A kind of frequency hopping communications anti-interference method based on cognitive radio |
| CN105634847B (en) * | 2014-11-04 | 2019-05-24 | 中国移动通信集团公司 | A kind of free time carrier detecting method and device |
| CN107276597A (en) * | 2017-05-12 | 2017-10-20 | 南京邮电大学 | A kind of two benches frequency spectrum perception optimization method based on USRPN200 |
| CN116056091B (en) * | 2023-03-30 | 2023-05-30 | 西南科技大学 | Communication networking method for offshore multi-mobile platform |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101072146A (en) * | 2007-04-13 | 2007-11-14 | 东华大学 | Body area medical wireless sensor network and its information collection and transmission method |
-
2008
- 2008-08-21 CN CN2008100419236A patent/CN101345535B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101072146A (en) * | 2007-04-13 | 2007-11-14 | 东华大学 | Body area medical wireless sensor network and its information collection and transmission method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101345535A (en) | 2009-01-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101345535B (en) | Information transmission method in wireless individual domain network medical scene based on frequency spectrum perception technology | |
| Tong et al. | Combating packet collisions using non-stationary signal scaling in LPWANs | |
| KR0153589B1 (en) | Cellular telephone location system | |
| JP4226325B2 (en) | Method and apparatus for identifying asset location in a communication network | |
| US7627327B2 (en) | Network overlay location system and method for air interface with frequency hopping | |
| US7283787B2 (en) | Direct amplifying station and positioning method for mobile station thereof | |
| EP1763164B1 (en) | Receiver, frequency deviation measuring unit and positioning and ranging system | |
| EP1672378B1 (en) | Node position measuring system | |
| US9232505B2 (en) | Method of generating packet, method of transmitting packet, and method of ranging of physical layer transmitter of wireless personal area network system | |
| US7729707B2 (en) | Method and system for synchronization offset reduction in a TDOA location system | |
| JP2021511508A (en) | Positioning method and related equipment | |
| US6973316B1 (en) | Position detecting method and apparatus | |
| EP2206272A1 (en) | System and method for distributing time and frequency over a network | |
| US9986410B2 (en) | Terminal and distance estimation method thereof | |
| CN102858010A (en) | Positioning method and device for mobile terminal | |
| CN114585081B (en) | 5GNR indoor positioning method based on slave positioning base station | |
| CN114828200B (en) | 5G-TSN-based power equipment time synchronization method | |
| CN106908807B (en) | Pseudo code modulation navigation positioning and deformation monitoring, monitoring terminal, monitoring center, navigation receiver and code data management center | |
| CN112020123B (en) | Low power consumption wireless mesh network and method for receiving and transmitting signals in wireless mesh network | |
| CN113518309A (en) | TDOA (time difference of arrival) estimation method and system for ultra-wideband indoor positioning | |
| CN101841902B (en) | Method and device for obtaining timeslot power | |
| CN202189145U (en) | Characteristic parameter acquisition device | |
| WO2022219249A1 (en) | Method and arrangement for determining a clock offset between at least two radio units | |
| Mehta et al. | An ultra wide band (uwb) based sensor network for civil infrastructure health monitoring | |
| JP2013250731A (en) | Automatic meter-reading system, portable terminal and radio communication method for portable terminal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110928 Termination date: 20140821 |
|
| EXPY | Termination of patent right or utility model |