CN102647235B - Method, equipment and system for cooperative spectrum sensing - Google Patents
Method, equipment and system for cooperative spectrum sensing Download PDFInfo
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- CN102647235B CN102647235B CN201110039283.7A CN201110039283A CN102647235B CN 102647235 B CN102647235 B CN 102647235B CN 201110039283 A CN201110039283 A CN 201110039283A CN 102647235 B CN102647235 B CN 102647235B
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Abstract
The invention provides a method, equipment and a system for cooperative spectrum sensing. The method comprises the following steps that: in the (n+1)th cooperative spectrum sensing process, sensing equipment participating in cooperative spectrum sensing samples a master user signal to obtain sampling data; according to an estimated quantization bit, the sampling data is quantized to obtain sensing information; and the sensing equipment sends sensing information to fused center equipment according to a sensing priority order determined in the nth cooperative spectrum sensing process until the fused center equipment judges whether a main user exists according to the sensing information, wherein n is more than or equal to the positive integer of 1. The system comprises the sensing equipment and the fused center equipment. According to the scheme provided by the embodiment, data transmission and sensing time in the cooperative spectrum sensing process can be effectively reduced.
Description
Technical field
The embodiment of the present invention relates to technical field of radio, relates in particular to a kind of method, apparatus and system of collaborative spectrum sensing.
Background technology
Research shows, in the frequency spectrum of current fixed allocation, have a large amount of frequency spectrums not used, and this has just caused the significant wastage of frequency spectrum resource.And cognitive radio (Cognitive Radio, referred to as: CR) can pass through cognitive radio spectrum environment, find these unappropriated frequency ranges, and at interfere with primary users (Primary User not, referred to as: under prerequisite PU), these frequency ranges of dynamic access, thus the availability of frequency spectrum improved, and this just makes CR become the most promising technology that solves current frequency spectrum resource anxiety.
Frequency spectrum perception is the key technology of CR.The object of frequency spectrum perception is the active situation that monitors and detect the PU signal in special frequency channel, and in the time detecting that idle frequency spectrum exists, CR system can be used this frequency spectrum; In the time detecting that PU signal occurs again, CR system must exit this frequency spectrum in official hour.By frequency spectrum perception, CR can avoid interference PU and improve the availability of frequency spectrum.Frequency spectrum perception can realize by individual node, also can realize by multiple node cooperations.Individual node is realized frequency spectrum perception and has the restriction of two aspects.First, the perceptual sensitivity of individual node is limited; Secondly, individual node perception can only reflect that this node frequency spectrum around can use situation, and can not reflect that the frequency spectrum of whole communication range can use situation.By contrast, multiple node cooperation frequency spectrum perception can solve the problem of above-mentioned two aspects, the space diversity that collaborative spectrum sensing can utilize the sensing node of diverse geographic location in CR network to form, improves overall detection performance greatly, and can obtain overall frequency spectrum and can use situation.
Realizing in process of the present invention, inventor finds that in prior art, at least there are the following problems:
In prior art, what participate in that the multiple nodes of collaborative spectrum sensing adopt is that the unified quantizer data after to perception quantize, these quantizers have the same quantification exponent number, do not consider the Spatial Difference of each node, such as the node having is close to PU, the PU signal strength signal intensity perceiving is large, and some nodes are away from PU, and the PU signal strength signal intensity perceiving is little.If all nodes all use identical quantizer to quantize, the little node of PU signal strength signal intensity perceiving so can be wasted partial data transmission bandwidth, makes detecting period elongated.
Summary of the invention
The embodiment of the present invention provides a kind of method, apparatus and system of collaborative spectrum sensing, in prior art, participate in the problem that multiple nodes of collaborative spectrum sensing adopt unified quantization devices to bring data transfer bandwidth waste, detecting period to grow in order to solve, effectively reduced transfer of data and detecting period in collaborative spectrum sensing process.
The embodiment of the present invention provides a kind of method of collaborative spectrum sensing, comprising:
In the collaborative spectrum sensing process of the n+1 time, the awareness apparatus that participates in collaborative spectrum sensing is sampled and is obtained sampled data primary user's signal, and according to the quantization digit of pre-estimation, described sampled data is quantized to obtain perception information;
Described awareness apparatus sends perception information to fusion center equipment, until described fusion center equipment makes according to described perception information the judgement whether primary user exists according to perception priority orders definite in the collaborative spectrum sensing process of the n time;
Wherein, n is more than or equal to 1 positive integer.
The embodiment of the present invention provides a kind of method of collaborative spectrum sensing, comprising:
In the collaborative spectrum sensing process of the n+1 time, fusion center equipment receives the awareness apparatus that participates in collaborative spectrum sensing according to the perception information of perception priority orders transmission definite in the collaborative spectrum sensing process of each comfortable the n time, until described fusion center equipment makes according to the perception information receiving the judgement whether primary user exists;
Wherein, n is more than or equal to 1 positive integer.
The embodiment of the present invention provides a kind of awareness apparatus, comprising:
Obtain module, for the collaborative spectrum sensing process at the n+1 time, primary user's signal is sampled and obtained sampled data, and according to the quantization digit of pre-estimation, described sampled data is quantized to obtain perception information;
Sending module, sends perception information to fusion center equipment, until described fusion center equipment makes according to described perception information the judgement whether primary user exists for the definite perception priority orders of the collaborative spectrum sensing process according to the n time; Wherein, n is more than or equal to 1 positive integer.
The embodiment of the present invention also provides a kind of fusion center equipment, comprising:
Judging module, for the collaborative spectrum sensing process at the n+1 time, receive the awareness apparatus that participates in collaborative spectrum sensing according to the perception information of perception priority orders transmission definite in the collaborative spectrum sensing process of each comfortable the n time, until make according to the perception information receiving the judgement whether primary user exists; Wherein, n is more than or equal to 1 positive integer.
The embodiment of the present invention provides a kind of system of collaborative spectrum sensing, comprising: multiple awareness apparatus, and fusion center equipment;
Described awareness apparatus is used for: the collaborative spectrum sensing process of the n+1 time, primary user's signal is sampled and obtained sampled data, and according to the quantization digit of pre-estimation, described sampled data is quantized to obtain perception information;
Described fusion center equipment is used for: receive the awareness apparatus that participates in collaborative spectrum sensing according to the perception information of the definite perception priority orders transmission of the collaborative spectrum sensing process of the n time, until make according to the perception information receiving the judgement whether primary user exists;
Wherein, n is more than or equal to 1 positive integer.
The method, apparatus and system of the collaborative spectrum sensing of the embodiment of the present invention, by in this cooperation perception, with reference to definite perception priority in last collaborative spectrum sensing process, and pre-estimation quantization digit, make different awareness apparatus adopt different quantization digits to quantize to obtain sensing results to the sampled data of primary user's signal, and according to perception priority orders, sensing results is sent to fusion center equipment until fusion center equipment makes according to sensing results the judgement whether primary user exists.This adopts many quantization digits to quantize sampled data and sends to fusion center equipment from the awareness apparatus close to primary user with regard to making, fusion statistic contribution to fusion center equipment is large, detecting period reduces, and in identical detecting period, can realize good perceptual performance; And adopt fewer quantization digit to quantize sampled data and select whether send to fusion center equipment according to actual conditions from the awareness apparatus away from primary user, effectively reduce transfer of data and detecting period.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The method flow diagram of the collaborative spectrum sensing that Fig. 1 provides for one embodiment of the invention;
The schematic diagram of definite perception priority that Fig. 2 provides for one embodiment of the invention;
The structural representation of a kind of awareness apparatus that Fig. 3 provides for one embodiment of the invention;
The structural representation of the another kind of awareness apparatus that Fig. 4 provides for one embodiment of the invention;
The structural representation of a kind of fusion center equipment that Fig. 5 provides for one embodiment of the invention;
The structural representation of the another kind of fusion center equipment that Fig. 6 provides for one embodiment of the invention;
The structural representation of another the fusion center equipment that Fig. 7 provides for one embodiment of the invention
The system configuration schematic diagram of a kind of collaborative spectrum sensing that Fig. 8 provides for one embodiment of the invention.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The method flow diagram of the collaborative spectrum sensing that Fig. 1 provides for one embodiment of the invention, as shown in Figure 1, the method comprises:
Step 101: in the collaborative spectrum sensing process of the n+1 time, the awareness apparatus that participates in collaborative spectrum sensing is sampled to primary user's information, obtains sampled data, and according to the quantization digit of pre-estimation, sampled data is quantized, and obtains perception information;
Unlike the prior art, between awareness apparatus, do not re-use identical quantization digit, but according to the quantization digit of pre-estimation, sampled data is quantized.
Wherein, can carry out pre-estimation to the quantization digit of awareness apparatus by following two kinds of modes:
The first, in the collaborative spectrum sensing process of the m time, the awareness apparatus that participates in collaborative spectrum sensing is estimated respectively the signal to noise ratio of primary user's signal, and send the signal to noise ratio of estimating to fusion center equipment, the signal to noise ratio of the estimation that fusion center equipment sends according to awareness apparatus is adjudicated the actual quantization figure place that this awareness apparatus adopts, and indicate corresponding awareness apparatus, so that awareness apparatus uses this quantization digit in follow-up collaborative spectrum sensing process.M can get and be more than or equal to the 1 any positive integer that is less than or equal to n.It should be noted that, between signal to noise ratio and quantization digit, can have a kind of mapping relations, this mapping relations can be that technical staff obtains based on experience value, also can obtain according to test of many times result.As shown in table 1, if the estimated snr that fusion center equipment receives is-19dB, fusion center equipment can send a message to corresponding awareness apparatus, notifies this awareness apparatus can adopt quantization digit 2bit in upper collaborative spectrum sensing process once.
Table 1
The second, in the collaborative spectrum sensing process of the m time, the awareness apparatus that participates in collaborative spectrum sensing is estimated respectively the signal to noise ratio of primary user's signal, and obtain from the quantization digit adopting in follow-up collaborative spectrum sensing process according to the signal to noise ratio of estimating, and the quantization digit of the pre-estimation obtaining is sent to fusion center equipment.The quantization digit that the awareness apparatus that fusion center equipment interconnection is received sends carries out record.
Step 102: awareness apparatus sends perception information to fusion center equipment, until fusion center equipment makes according to perception information the judgement whether primary user exists according to perception priority orders definite in the collaborative spectrum sensing process of the n time.
Wherein, in collaborative spectrum sensing, fusion center equipment is that a kind of responsible collection participates in the perception information of all awareness apparatus of collaborative spectrum sensing, and judges according to the perception information of collecting the equipment whether primary user exists.Fusion center equipment can be one that participates in the awareness apparatus of collaborative spectrum sensing, can be also the equipment being independent of outside the awareness apparatus that participates in collaborative spectrum sensing.
In fusion center equipment, there are two decision thresholds (the first decision threshold and the second decision threshold), decision threshold is relevant with detection probability and false alarm probability, and these two probable values all configure according to demand.The perception information of collecting when fusion center equipment is added to the first decision threshold that exceedes primary user's existence, and fusion center equipment determines to stop perception, and adjudicates primary user's existence; The perception information of collecting when fusion center equipment is added to non-existent the second decision threshold lower than primary user, and fusion center equipment determines to stop perception, and adjudicates primary user and do not exist.
In collaborative spectrum sensing process each time, each awareness apparatus has own corresponding perception priority, and this perception priority can obtain in the following way:
1, in the collaborative spectrum sensing process of the n+1 time, awareness apparatus is sampled to primary user's signal in detecting period, obtains sampled data.
2, according to the quantization digit of pre-estimation, sampled data is quantized, obtain perception information.
3, perception information is sent to fusion center equipment.
4, fusion center equipment upgrades and merges statistic according to the perception information of the awareness apparatus receiving.
Wherein, upgrade and merge the mode of statistic and have a lot, the simplest method is directly to add up, or can also weighted accumulation etc. mode carry out.
5, according to the fusion statistic after upgrading and default decision threshold, determine the perception priority of awareness apparatus in the collaborative spectrum sensing process of the n+2 time.
6, the perception priority of awareness apparatus is issued to corresponding awareness apparatus.
The schematic diagram of definite perception priority that one embodiment of the invention as shown in Figure 2 provides, in Fig. 2, r1 is the first decision threshold that judgement primary user exists, r2 is non-existent the second decision threshold of judgement primary user, dot represents the perception information that each awareness apparatus obtains in this collaborative spectrum sensing process, wherein, dot its perception priority nearest apart from decision threshold (r1 or r2) is the highest, d1 represents the distance of distance the first decision threshold r1, and d0 represents the distance of distance the second decision threshold r2.
Generally speaking, if certain awareness apparatus is closer apart from primary user, the primary user's signal strength signal intensity perceiving will be larger, can adopt many quantization digits to quantize to obtain perception information to sampled data, this perception information sends to after fusion center equipment, fusion statistic contribution to fusion center equipment is large, and fusion center equipment may allow this awareness apparatus first carry out frequency spectrum perception in upper collaborative spectrum sensing once.
The embodiment of the present invention provides a kind of method of collaborative spectrum sensing, by in this cooperation perception, with reference to definite perception priority in last collaborative spectrum sensing process, and pre-estimation quantization digit, make different awareness apparatus adopt different quantization digits to quantize to obtain sensing results to the sampled data of primary user's signal, and according to perception priority orders, sensing results is sent to fusion center equipment until fusion center equipment makes according to sensing results the judgement whether primary user exists.This adopts many quantization digits to quantize sampled data and sends to fusion center equipment from the awareness apparatus close to primary user with regard to making, fusion statistic contribution to fusion center equipment is large, detecting period reduces, and in identical detecting period, can realize good perceptual performance; And adopt fewer quantization digit to quantize sampled data and select whether send to fusion center equipment according to actual conditions from the awareness apparatus away from primary user, effectively reduce transfer of data and detecting period.
The structural representation of a kind of awareness apparatus that Fig. 3 provides for one embodiment of the invention, this awareness apparatus 3a is one of executive agent in said method embodiment, therefore can be referring to the description in embodiment of the method about awareness apparatus specific works method in the present embodiment, the present embodiment does not repeat.As shown in Figure 3, this awareness apparatus 3a comprises: obtain module 301 and sending module 302.Wherein, obtain module 301 for the collaborative spectrum sensing process at the n+1 time, primary user's signal is sampled and obtained sampled data, and according to the quantization digit of pre-estimation, sampled data is quantized to obtain perception information; Sending module 302, sends perception information to fusion center equipment, until fusion center equipment makes according to perception information the judgement whether primary user exists for the definite perception priority orders of the collaborative spectrum sensing process according to the n time; Wherein, n is more than or equal to 1 positive integer.
Under a kind of execution mode, the structural representation of the another kind of awareness apparatus that one embodiment of the invention as shown in Figure 4 provides, this awareness apparatus 3b can also comprise on the basis of the awareness apparatus described in Fig. 3: pre-estimation module 303.Pre-estimation module 303 is for obtaining the quantization digit of pre-estimation.Concrete, this pre-estimation module 303 can comprise: pre-estimation unit, for the collaborative spectrum sensing process at the m time, estimate the signal to noise ratio of primary user's signal, and according to the quantization digit of signal-to-noise ratio (SNR) estimation self employing and notify fusion center equipment; Wherein, m is the positive integer that is more than or equal to 1, is less than or equal to n.
The structural representation of a kind of fusion center equipment that Fig. 5 provides for one embodiment of the invention, this fusion center equipment 5a is one of specific executive agent in said method embodiment, therefore can be referring to the description in embodiment of the method about fusion center equipment specific works method in the present embodiment, the present embodiment does not repeat.As shown in Figure 5, this fusion center equipment 5a comprises: judging module 501.Wherein, this judging module 501 is for the collaborative spectrum sensing process at the n+1 time, receive the awareness apparatus that participates in collaborative spectrum sensing according to the perception information of perception priority orders transmission definite in the collaborative spectrum sensing process of each comfortable the n time, until make according to the perception information receiving the judgement whether primary user exists; Wherein, n is more than or equal to 1 positive integer.
Under a kind of execution mode, the structural representation of the another kind of fusion center equipment that one embodiment of the invention as shown in Figure 6 provides, this fusion center equipment 5b can also comprise on the basis of the fusion center equipment described in Fig. 5: pre-estimation module 502.Wherein, the quantization digit that this pre-estimation module 502 adopts for obtaining awareness apparatus.Concrete, this pre-estimation module 502 comprises: the first pre-estimation unit or the second pre-estimation unit.The first pre-estimation unit is for the collaborative spectrum sensing process at the m time, receive the signal to noise ratio of primary user's signal of the awareness apparatus estimation that participates in collaborative spectrum sensing, the quantization digit adopting according to the signal to noise ratio judgement awareness apparatus of estimating, and indicate awareness apparatus; The second pre-estimation unit, for the collaborative spectrum sensing process at the m time, receives the quantization digit of the awareness apparatus pre-estimation of awareness apparatus transmission; Wherein, m is the positive integer that is more than or equal to 1, is less than or equal to n.
Under another kind of execution mode, the structural representation of another the fusion center equipment that one embodiment of the invention as shown in Figure 7 provides, this fusion center equipment 5c can also comprise on the basis of the fusion center equipment described in Fig. 6: priority block 503.This priority block 503 is for the collaborative spectrum sensing process at the n+1 time, receive the sampled data of the primary user's signal after awareness apparatus quantizes according to the quantization digit of pre-estimation, upgrade and merge statistic according to the sampled data of the primary user's signal after quantizing, according to the fusion statistic after upgrading and default decision threshold, determine the perception priority of awareness apparatus in the collaborative spectrum sensing process of the n+2 time, and send to awareness apparatus.
The system configuration schematic diagram of a kind of collaborative spectrum sensing that Fig. 8 provides for one embodiment of the invention, as shown in Figure 8, this system comprises: multiple awareness apparatus 801 and fusion center equipment 802.In Fig. 8, only draw two awareness apparatus 801, can also comprise more awareness apparatus 801, in figure, be represented by dotted lines.It should be noted that, the awareness apparatus 801 providing in the present embodiment and fusion center equipment 802 are the special body of carrying out said method embodiment, and therefore the content of embodiment of the method is brought in the present embodiment by reference.
Wherein, awareness apparatus 801, for the collaborative spectrum sensing process at the n+1 time, is sampled and is obtained sampled data primary user's signal, and according to the quantization digit of pre-estimation, sampled data is quantized to obtain perception information; Fusion center equipment 802 is for receiving the awareness apparatus that participates in collaborative spectrum sensing according to the perception information of the definite perception priority orders transmission of the collaborative spectrum sensing process of the n time, until make according to the perception information receiving the judgement whether primary user exists.
The system that the embodiment of the present invention provides a kind of equipment of collaborative spectrum sensing and has been made up of equipment, by in this cooperation perception, with reference to definite perception priority in last collaborative spectrum sensing process, and pre-estimation quantization digit, make different awareness apparatus adopt different quantization digits to quantize to obtain sensing results to the sampled data of primary user's signal, and according to perception priority orders, sensing results is sent to fusion center equipment until fusion center equipment makes according to sensing results the judgement whether primary user exists.This adopts many quantization digits to quantize sampled data and sends to fusion center equipment from the awareness apparatus close to primary user with regard to making, fusion statistic contribution to fusion center equipment is large, detecting period reduces, and in identical detecting period, can realize good perceptual performance; And adopt fewer quantization digit to quantize sampled data and select whether send to fusion center equipment according to actual conditions from the awareness apparatus away from primary user, effectively reduce transfer of data and detecting period.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can complete by the relevant hardware of program command, aforesaid program can be stored in a computer read/write memory medium, this program, in the time carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (11)
1. a method for collaborative spectrum sensing, is characterized in that, comprising:
In the collaborative spectrum sensing process of the n+1 time, the awareness apparatus that participates in collaborative spectrum sensing is sampled and is obtained sampled data primary user's signal, and according to the quantization digit of pre-estimation, described sampled data is quantized to obtain perception information;
Described awareness apparatus sends perception information to fusion center equipment, until described fusion center equipment makes according to described perception information the judgement whether primary user exists according to perception priority orders definite in the collaborative spectrum sensing process of the n time;
Wherein, n is more than or equal to 1 positive integer;
Wherein, the quantization digit of described pre-estimation is determined in the following way:
In the collaborative spectrum sensing process of the m time, the awareness apparatus that participates in collaborative spectrum sensing is estimated the signal to noise ratio of primary user's signal, and the signal to noise ratio that sends described estimation is to described fusion center equipment, so that described fusion center equipment adjudicates according to the signal to noise ratio of described estimation the quantization digit that described awareness apparatus adopts, and indicate described awareness apparatus;
Or,
In the collaborative spectrum sensing process of the m time, the awareness apparatus that participates in collaborative spectrum sensing is estimated the signal to noise ratio of primary user signal, and the quantization digit adopting according to described signal-to-noise ratio (SNR) estimation self notify described fusion center equipment;
Wherein, m is the positive integer that is more than or equal to 1, is less than or equal to n.
2. method according to claim 1, is characterized in that, described perception priority is determined in the following way:
In the collaborative spectrum sensing process of the n time, the awareness apparatus that participates in collaborative spectrum sensing is sampled and is obtained sampled data primary user's signal in detecting period, and according to the quantization digit of pre-estimation, sampled data is quantized to obtain perception information, and send to described fusion center equipment, so that described fusion center equipment upgrades and merges statistic according to described perception information, and according to the fusion statistic after described renewal and default decision threshold, determine the perception priority of described awareness apparatus in the collaborative spectrum sensing process of the n+1 time and send to described awareness apparatus.
3. a method for collaborative spectrum sensing, is characterized in that, comprising:
In the collaborative spectrum sensing process of the n+1 time, fusion center equipment receives the awareness apparatus that participates in collaborative spectrum sensing according to the perception information of perception priority orders transmission definite in the collaborative spectrum sensing process of each comfortable the n time, until described fusion center equipment makes according to the perception information receiving the judgement whether primary user exists;
Wherein, n is more than or equal to 1 positive integer;
Wherein, described perception information is that described awareness apparatus is sampled and obtained sampled data primary user's signal, and the perception information that described sampled data is quantized to obtain according to the quantization digit of pre-estimation;
Wherein, the quantization digit of described pre-estimation is determined in the following way: in the collaborative spectrum sensing process of the m time, described fusion center equipment receives the estimated value of the primary user's of described awareness apparatus transmission signal to noise ratio, adjudicates the pre-estimation quantization digit of described awareness apparatus and indicates described awareness apparatus according to described signal-to-noise ratio (SNR) estimation value;
Or,
In the collaborative spectrum sensing process of the m time, described fusion center equipment receives the quantization digit of the described awareness apparatus pre-estimation of described awareness apparatus transmission;
Wherein, m is the positive integer that is more than or equal to 1, is less than or equal to n.
4. method according to claim 3, is characterized in that, described method also comprises:
In the collaborative spectrum sensing process of the n+1 time, described fusion center equipment receives the sampled data of the primary user's signal after described awareness apparatus quantizes according to the quantization digit of described pre-estimation, upgrades and merges statistic according to the sampled data of the primary user's signal after described quantification;
According to the fusion statistic after described renewal and default decision threshold, determine the perception priority of described awareness apparatus in the collaborative spectrum sensing process of the n+2 time, and send to described awareness apparatus.
5. method according to claim 4, is characterized in that, described according to the fusion statistic after described renewal and default decision threshold, determines that the perception priority of described awareness apparatus in the collaborative spectrum sensing process of the n+2 time comprises:
In the collaborative spectrum sensing process of the n+1 time, described fusion center equipment receives the perception information that described awareness apparatus sends, to merging the contribution of statistic, determine the perception priority of described awareness apparatus in the collaborative spectrum sensing process of the n+2 time according to described perception information.
6. an awareness apparatus, is characterized in that, comprising:
Obtain module, for the collaborative spectrum sensing process at the n+1 time, primary user's signal is sampled and obtained sampled data, and according to the quantization digit of pre-estimation, described sampled data is quantized to obtain perception information;
Wherein, the quantization digit of described pre-estimation is determined in the following way:
In the collaborative spectrum sensing process of the m time, the awareness apparatus that participates in collaborative spectrum sensing is estimated the signal to noise ratio of primary user's signal, and the signal to noise ratio that sends described estimation is to fusion center equipment, so that described fusion center equipment adjudicates according to the signal to noise ratio of described estimation the quantization digit that described awareness apparatus adopts, and indicate described awareness apparatus;
Or,
In the collaborative spectrum sensing process of the m time, the awareness apparatus that participates in collaborative spectrum sensing is estimated the signal to noise ratio of primary user signal, and the quantization digit adopting according to described signal-to-noise ratio (SNR) estimation self notify described fusion center equipment;
Wherein, m is the positive integer that is more than or equal to 1, is less than or equal to n;
Sending module, sends perception information to fusion center equipment, until described fusion center equipment makes according to described perception information the judgement whether primary user exists for the definite perception priority orders of the collaborative spectrum sensing process according to the n time; Wherein, n is more than or equal to 1 positive integer.
7. awareness apparatus according to claim 6, is characterized in that, also comprises:
Pre-estimation module, for obtaining the quantization digit of described pre-estimation;
Described pre-estimation module comprises:
Pre-estimation unit, for the collaborative spectrum sensing process at the m time, estimates the signal to noise ratio of primary user signal, and the quantization digit adopting according to described signal-to-noise ratio (SNR) estimation self notify described fusion center equipment; Wherein, m is the positive integer that is more than or equal to 1, is less than or equal to n.
8. a fusion center equipment, is characterized in that, comprising:
Judging module, for the collaborative spectrum sensing process at the n+1 time, receive the awareness apparatus that participates in collaborative spectrum sensing according to the perception information of perception priority orders transmission definite in the collaborative spectrum sensing process of each comfortable the n time, until make according to the perception information receiving the judgement whether primary user exists; Wherein, n is more than or equal to 1 positive integer;
Wherein, described perception information is that described awareness apparatus is sampled and obtained sampled data primary user's signal, and the perception information that described sampled data is quantized to obtain according to the quantization digit of pre-estimation;
Wherein, the quantization digit of described pre-estimation is determined in the following way:
In the collaborative spectrum sensing process of the m time, described fusion center equipment receives the estimated value of the primary user's of described awareness apparatus transmission signal to noise ratio, adjudicates the pre-estimation quantization digit of described awareness apparatus and indicates described awareness apparatus according to described signal-to-noise ratio (SNR) estimation value;
Or,
In the collaborative spectrum sensing process of the m time, described fusion center equipment receives the quantization digit of the described awareness apparatus pre-estimation of described awareness apparatus transmission;
Wherein, m is the positive integer that is more than or equal to 1, is less than or equal to n.
9. fusion center equipment according to claim 8, is characterized in that, also comprises:
Pre-estimation module, the quantization digit adopting for obtaining described awareness apparatus;
Described pre-estimation module comprises:
The first pre-estimation unit, for the collaborative spectrum sensing process at the m time, receive the signal to noise ratio of primary user's signal of the awareness apparatus estimation that participates in collaborative spectrum sensing, adjudicate according to the signal to noise ratio of described estimation the quantization digit that described awareness apparatus adopts, and indicate described awareness apparatus;
Or,
The second pre-estimation unit, for the collaborative spectrum sensing process at the m time, receives the quantization digit of the described awareness apparatus pre-estimation of described awareness apparatus transmission;
Wherein, m is the positive integer that is more than or equal to 1, is less than or equal to n.
10. fusion center equipment according to claim 9, is characterized in that, also comprises:
Priority block, for the collaborative spectrum sensing process at the n+1 time, receive the sampled data of the primary user's signal after described awareness apparatus quantizes according to the quantization digit of described pre-estimation, upgrade and merge statistic according to the sampled data of the primary user's signal after described quantification, according to the fusion statistic after described renewal and default decision threshold, determine the perception priority of described awareness apparatus in the collaborative spectrum sensing process of the n+2 time, and send to described awareness apparatus.
The system of 11. 1 kinds of collaborative spectrum sensing, is characterized in that, comprising: multiple awareness apparatus, and fusion center equipment;
Described awareness apparatus, for the collaborative spectrum sensing process at the n+1 time, samples and obtains sampled data primary user's signal, and according to the quantization digit of pre-estimation, described sampled data is quantized to obtain perception information;
Described fusion center equipment, for receiving the awareness apparatus that participates in collaborative spectrum sensing according to the perception information of the definite perception priority orders transmission of the collaborative spectrum sensing process of the n time, until make according to the perception information receiving the judgement whether primary user exists;
Wherein, n is more than or equal to 1 positive integer;
Wherein, the quantization digit of described pre-estimation is determined in the following way: in the collaborative spectrum sensing process of the m time, described fusion center equipment receives the estimated value of the primary user's of described awareness apparatus transmission signal to noise ratio, adjudicates the pre-estimation quantization digit of described awareness apparatus and indicates described awareness apparatus according to described signal-to-noise ratio (SNR) estimation value;
Or,
In the collaborative spectrum sensing process of the m time, the awareness apparatus that participates in collaborative spectrum sensing is estimated the signal to noise ratio of primary user signal, and the quantization digit adopting according to described signal-to-noise ratio (SNR) estimation self notify described fusion center equipment;
Wherein, m is the positive integer that is more than or equal to 1, is less than or equal to n.
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| CN104469784A (en) * | 2013-09-17 | 2015-03-25 | 中兴通讯股份有限公司 | Processing method and apparatus of frequency spectrum sensing data in heterogeneous network |
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