CN101765124B - Channel capacity analytical method in chance spectra sharing system - Google Patents
Channel capacity analytical method in chance spectra sharing system Download PDFInfo
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- CN101765124B CN101765124B CN2010100183220A CN201010018322A CN101765124B CN 101765124 B CN101765124 B CN 101765124B CN 2010100183220 A CN2010100183220 A CN 2010100183220A CN 201010018322 A CN201010018322 A CN 201010018322A CN 101765124 B CN101765124 B CN 101765124B
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Abstract
The invention relates to a channel capacity analytical method in a chance spectra sharing system, which has a basic idea of analyzing a secondary user signal interference-to-noise ratio (SINR), analyzing the difference between the secondary user channel capacity and traditional channel capacity, and determining a major factor affecting the secondary user channel capacity in the chance spectra sharing system. The method of the invention comprises the following steps: analyzing the secondary user signal interference-to-noise ratio SINR; analyzing the difference between the secondary user channel capacity and the traditional channel capacity; and determining the major factor affecting the secondary user channel capacity in the chance spectra sharing system. In the chance spectra sharing system, when the secondary user designs the transmission frame length and detection time and carries out utility function design, the secondary user needs to consider the secondary user channel capacity; and at the early stage of design, the secondary user needs to carry out corresponding theoretical analysis out of band and stores in a table of which the contents are changed along with the changes of authorized users, authorized channels and secondary user moving factors. The invention provides a theoretical analysis basis and reference of a physical layer and an MAC layer key technology design for the chance spectra sharing system.
Description
Technical field
The present invention relates generally to a kind of New Policy of analyzing cognitive user (inferior user) channel capacity of opportunity spectrum sharing system in the cognition network.This strategy provides the theoretical foundation of analyzing channel capacity, and inferior user designs the theoretical foundation of transmission parameter, and as the theory index of optimizing the opportunity spectrum sharing system performance.The basic thought of this scheme is to analyze time subscriber signal interference-to-noise ratio (SINR), and analyzes the different of time subscriber channel capacity and conventional channel capacity with this, confirms the principal element of the inferior subscriber channel capacity of influence in the opportunity spectrum sharing system.
Background technology
1948, founder's Shannon of modern digital communication was pointed out in channel coding theorem, as long as the code length of random coded is enough big, just can infinitely approaches the communication of channel capacity C and make error probability arbitrarily small.After Shannon, people are untiringly to the direction effort that approaches channel capacity.And produced Shannon (Shannon) channel capacity formula of calculating channel capacity.What shannon formula showed is to give regularly when the average power of signal and channel additive white Gaussian noise, has on the channel of certain frequency bandwidth, in theory the limiting figure of possibility information transmitted amount in the unit interval.
Yet wireless communication technology develops so far, and communication channel and communication environment be the imagination in Shannon epoch head and shoulders above.Present cognition network and cognitive communications make communication channel more complicated and changeable.Except traditional broadcast channel, polynary access channel, channel types such as trunk channel, interference channel have also appearred.Along with the increase of channel complexity, simple shannon formula can not be contained the various factors that determines message capacity.Especially in cognition network, because the appearance of various frequency spectrum share technology, between the primary and secondary user or coexist as in the same channel, or alternately appear in the same channel, more increased the time variation and the randomness of channel.Therefore, further analyzing the channel capacity of sharing under the signal intelligence that perhaps coexists, is theoretical foundation and the foundation of analyzing and improve cognition network technology and performance.
Summary of the invention
Technical problem: the purpose of this invention is to provide channel capacity analytical method in a kind of opportunity spectrum sharing system; Be used as the theoretical foundation of cognitive user (inferior user) design transmission parameter; Analyze the theoretical foundation of channel capacity, and as the theory index of optimizing the opportunity spectrum sharing system performance.This theoretical foundation addresses the above problem and/or shortcoming at least basically, and following advantage is provided at least.Therefore, the present invention provides a kind of theoretical foundation and foundation of analyzing and improving cognition network technology and performance.
Technical scheme: channel capacity analytical method Benq at first analyzes the variation characteristic of time subscriber signal interference-to-noise ratio (SINR) in the opportunity spectrum sharing system in above consideration in this a kind of opportunity spectrum sharing system.Next analyzes in the opportunity spectrum sharing system authorization channel to the influence of inferior user SINR.At last in the opportunity spectrum sharing system that draws subscriber channel capacity is used for the practical application design.
Analyze time subscriber signal interference-to-noise ratio SINR, and analyze the different of time subscriber channel capacity and conventional channel capacity, confirm the principal element of the inferior subscriber channel capacity of influence in the opportunity spectrum sharing system with this; In opportunity spectrum sharing system; When inferior user designs its transmission frame length, detection time and carries out the utility function design, all need consider time subscriber channel capacity, in design initial; Inferior user need carry out its corresponding theory analysis outside band; And be stored in the form, this table content is along with authorized user, authorization channel, inferior user move the variation of factor and change, and concrete grammar is:
Step 1: before carrying out parameter designing; At first carry out distance detecting to main user; Inferior user detects distance B; And the distance between the judgement primary and secondary user; If time user is in main user's interference distance scope; At this moment, inferior user withdraws from the detection to this main subscriber channel, seeks other authorization channel afterwards; If time user is outside main user's interference distance scope, inferior user proceeds environment measuring;
Step 2: environment measuring, comprise the transmission environment of detection channel when authorization channel is uploaded transmission information, confirm the fading characteristic of authorization channel and the decline type of channel;
Step 3: carry out the detection of time user's transmitting terminal to main user's transmitting terminal, receiving terminal and inferior user's receiving terminal positional information, time user predicts that through historical data the broadcast message of perhaps intercepting main user obtains the characteristic information β that main user takies authorization channel simultaneously
1
Step 4: after obtaining above parameter; Carry out the calculating and the analysis of theoretical capacity; Inferior user calculates under the fading channel condition; Can reach an average size dividing value of throughput when not bumping, the calculating of this value is that authorization channel fading characteristic, primary and secondary user power and positional information and main user are carried out obtaining after the analysis-by-synthesis to informations parameter such as authorization channel operating characteristics.This average size dividing value is to comprise design parameter such as time user's transmission frame length at interior function expression;
Step 5: based on average size dividing value expression formula; Can transmit parameter inferior user on the one hand; Under the situation of fixing frame length, detection time, analyze of the influence of authorization channel transmission characteristic to inferior user's transmission performance, for inferior user selects preferred channels between a plurality of authorization channels foundation is provided; Can under given authorization channel condition, optimize time user's transmission parameter on the other hand;
Step 6: the average size dividing value expression formula to obtain is a utility function, obtains needed design parameter through optimization criterion; If parameter is time user's transmission frame length and length detection time,, be the optimal value that target obtains desired parameters to maximize the average size dividing value according to optimization criterion;
Step 7: the result is reported to time user's transmitting terminal and receiving terminal, carry out the transmission of data with synchronously.
In inferior user's theory analysis stage; Inferior user's transmitting terminal need be set up corresponding form stores information outside band, and this information is along with authorization channel fading characteristic, primary and secondary user power and positional information and main user carry out real-time update to the change of informations parameter such as authorization channel operating characteristic.
Beneficial effect: experimental result proves; This capacity theory has merged influence time user's transmission rate and transmission quality and inferior user to the various principal elements that main user disturbs, and the theory analysis basis and the foundation of physical layer and MAC layer Key Technologies Design is provided for opportunity spectrum sharing system.
Description of drawings
Through below in conjunction with the accompanying drawing and the detailed description of carrying out, it is clearer that above and other objects of the present invention, characteristics and advantage will become, wherein;
The frame structure case that Fig. 1 shows primary and secondary CU authorization channel and detects authorization channel.
Fig. 2 shows primary and secondary customer location case in the opportunity spectrum sharing system.
Fig. 3 shows the flow chart of capacity theoretical direction real case design of the present invention.
Embodiment
At first, here the term definition of definition is following:
SINR: inferior user's Signal Interference and Noise Ratio
γ：SINR
β
0: the average duration of main CU channel
β
1: main user discharges the average duration of channel
T: main user by busy channel to discharging the used time of channel
Tt: main user is by discharging channel to the used time of busy channel
I: inferior user is to main user's detection time
T: inferior user's frame length
T
i: the frame length of inferior user i
P
0: main user is in the received power of inferior user's receiving terminal
P
s: inferior user is in the received power of inferior user's receiving terminal
P
T0: the transmitted power of main user's transmitting terminal
P
Ts: the transmitted power of inferior user's transmitting terminal
P
Th: the tolerable interference power thresholding of main user's receiving terminal
γ
Th: the tolerable SINR thresholding of main user's receiving terminal
N: system is number of users last time
N
0: AWGN power
N
j: the SINR level passes through SINR thresholding γ
jLevel crossing rate
P (): probability density function
F (): exponential distribution function
B: the channel width of authorization channel
α: the path attenuation factor
γ
c(T, τ, P
s, P
0): time user's instantaneous SINR when bumping with main user
Time user's average SINR when
bumps with main user
γ
Nc(T, τ, P
s, P
0): time user's instantaneous SINR when not bumping with main user
average SINR of time user when not bumping with main user
f
D: the maximum doppler frequency of fading channel
The average SINR of
fading channel
r
Pp: main user's transmitting terminal is to the distance of main user's receiving terminal
h
Pp: main user's transmitting terminal is to the wireless transmission channel fading factor of main user's receiving terminal
r
Ps: main user's transmitting terminal is to the distance of time user's receiving terminal
h
Ps: main user's transmitting terminal is to the wireless transmission channel fading factor of time user's receiving terminal
r
Ss: inferior user's transmitting terminal is to the distance of time user's receiving terminal
h
Ss: inferior user's transmitting terminal is to the wireless transmission channel fading factor of time user's receiving terminal
r
Sp: inferior user's transmitting terminal is to the distance of main user's receiving terminal
h
Sp: inferior user's transmitting terminal is to the wireless transmission channel fading factor of main user's receiving terminal
D: main user's transmitting terminal to the distance of time user's transmitting terminal does.
Cognitive user channel capacity theory analysis is following in the opportunity spectrum sharing system:
1. main user is to the influence of channel capacity:
With reference to Fig. 1, main user takies index of coincidence on-off discharge model to authorization channel.Main CU channel in this model, the average duration of promptly opening is β
0Main user is busy channel not, and the average duration of promptly closing is β
i, main user is t by busy channel to discharging the used time of channel, its obeys index distribution.Suppose that time user's frame length is T, the i millisecond time is used for the detection to main subscriber channel before the insertion authority channel.When detecting main user and not existing, transmit time user data in the time at T-i, in the transmission data procedures, main user can occur at any time, and the primary and secondary user can bump and time user's data bag was lost fully this moment.Frame length T has not only determined inferior user to transmit data length (inferior user throughput) but also has determined the frequency (collision probability) that inferior user detects main user.In time, when main user occurred, inferior user's SINR was expressed as at T
Because t obeys following exponential distribution
Average SINR when bumping at this moment, is expressed as
The corresponding time user of this SINR can reach an average size dividing value of throughput when bumping, promptly
Likewise, in the time, when main user did not occur, inferior user's SINR was expressed as at T
Tt obeys following exponential distribution
Average SINR when not bumping at this moment, is expressed as
The corresponding time user of this SINR can reach an average size dividing value of throughput when not bumping, promptly
It is thus clear that inferior user's SINR and corresponding channel capacity are the main user power P by inferior user's transmission frame length T, detection time, length i, inferior user's receiving terminal received
0And inferior user power P
sCommon decision.
2. authorization channel is to main user's influence
With reference to Fig. 2, for main user, exist around its transmitting terminal one to be that the center of circle is with d with main user's transmitting terminal by its maximum admissible interference power decision
pProtection zone for radius.For inferior user, the following user's transmitting terminal by its maximum admissible interference power decision of the same existence of its transmitting terminal is that the center of circle is with d
sProtection zone for radius.
If D＜d
p+ d
s, the protection zone that promptly inferior user's transmitting terminal gets into main user then produces interference to main user's transmitting terminal, on the other hand; If main user at the power of inferior user's receiving terminal greater than the tolerable scope of inferior user; Inferior user's transmission quality also can descend, and at this moment, primary and secondary user bumps.The relational expression of inferior user's receiving terminal received power does
Consider the channel fading factor, further analyze the SINR that time user's receiving terminal receives, obtain at T in the time, when main user occurred, inferior user's instantaneous SINR was expressed as
Average SINR when bumping at this moment, is expressed as
The corresponding time user of this SINR can reach channel capacity when bumping average size dividing value is expressed as
In time, when main user did not occur, inferior user's instantaneous SINR was expressed as at T
Average SINR when not bumping at this moment, is expressed as
The corresponding time user of this SINR can reach an average size dividing value of throughput when not bumping, promptly
Finally, inferior user is under Rayleigh fading channel condition, and an average size dividing value expression that can reach throughput when not bumping does
And, exist at main user's receiving terminal
Preferential embodiment of the present invention is here described below with reference to accompanying drawings.Because known function and structure make the present invention fuzzy in unnecessary details, therefore they are described no longer in the specification below.
With reference to Fig. 3, the embodiment of the present invention's theoretical direction time user's transmission policy in Fig. 2 applied environment is:
Step 310: distance detecting.Inferior user detects distance B, and in step 312, judges the distance between the primary and secondary user transmitting terminal, if D＜d
p+ d
s, show time user in main user's interference distance scope, at this moment, inferior user withdraws from the detection to this main subscriber channel, in step 328, seeks other authorization channel.If D>=d
p+ d
s, show that time user outside main user's interference distance scope, gets into step 314.
Step 314: environment measuring.Inferior user detects the transmission environment of channel when on authorization channel, transmitting, and confirms the fading characteristic of authorization channel, and gets into step 316
Step 316: positional information detects.Inferior user detection position information comprises r
Pp, r
Ps, r
Ss, r
Sp
Step 318: channel occupancy condition detection.Inferior user obtains main CU channel characteristic information β
i
Step 320: theoretical capacity calculates.Inferior user calculates under the fading channel condition, can reach an average size dividing value of throughput when not bumping.If the transmission characteristic of inferior user's use authority channel is the Rayleigh fading channel, then the expression formula of lower bound does
Step 322: obtain design parameter.At this, parameter is time user's transmission frame length.According to optimisation strategy
Design time user's optimal transmission frame length and length detection time, and in step 324, report inferior user's transmitting terminal and receiving terminal with the result.
Step 310 to step 324 is time user's theory analysis stage; Can outside band, set up corresponding form stores information at inferior user side; And this information is the real-time update process in step 326, comprises the relevant information of current authorization channel and other authorization channel is upgraded.
Claims (1)
1. channel capacity analytical method in the opportunity spectrum sharing system; It is characterized in that analyzing time subscriber signal interference-to-noise ratio SINR; And analyze the different of time subscriber channel capacity and conventional channel capacity with this, confirm the principal element of the inferior subscriber channel capacity of influence in the opportunity spectrum sharing system; In opportunity spectrum sharing system; When inferior user designs its transmission frame length, detection time and carries out the utility function design, all need consider time subscriber channel capacity, in design initial; Inferior user need carry out its corresponding theory analysis outside band; And be stored in the form, this table content is along with authorized user, authorization channel, inferior user move the variation of factor and change, and concrete grammar is:
Step 1: before carrying out parameter designing; At first carry out the distance detecting to main user, it is D to the distance of main user's transmitting terminal that inferior user detects time user's transmitting terminal, and the distance between the judgement primary and secondary user; If time user is in main user's interference distance scope; At this moment, inferior user withdraws from the detection to this main subscriber channel, seeks other authorization channel afterwards; If time user is outside main user's interference distance scope, inferior user proceeds environment measuring;
Step 2: environment measuring, comprise the transmission environment of detection channel when authorization channel is uploaded transmission information, confirm the fading characteristic of authorization channel and the decline type of channel;
Step 3: carry out the detection of time user's transmitting terminal to main user's transmitting terminal, receiving terminal and inferior user's receiving terminal positional information, time user predicts that through historical data the broadcast message of perhaps intercepting main user obtains the characteristic information β that main user takies authorization channel simultaneously
1
Step 4: after obtaining above parameter; Carry out the calculating and the analysis of theoretical capacity; Inferior user calculates under the fading channel condition; Can reach an average size dividing value of throughput when not bumping, the calculating of this value is to comprising that authorization channel fading characteristic, primary and secondary user power and positional information and main user carry out obtaining after the analysis-by-synthesis to the information parameter of authorization channel operating characteristic, and this average size dividing value is to comprise time user's transmission frame length at interior function expression;
Step 5: according to average size dividing value expression formula; On the one hand can be under inferior user's frame length or detection time fixing situation; Analyze of the influence of authorization channel transmission characteristic, foundation is provided for inferior user selects preferred channels between a plurality of authorization channels to inferior user's transmission performance; Can under given authorization channel condition, optimize time user's transmission parameter on the other hand;
Step 6: the average size dividing value expression formula to obtain is a utility function, obtains needed design parameter through optimization criterion; If parameter is time user's transmission frame length and length detection time,, be the optimal value that target obtains desired parameters to maximize the average size dividing value according to optimization criterion;
Step 7: the result is reported to time user's transmitting terminal and receiving terminal, carry out the transmission of data with synchronously,
In inferior user's theory analysis stage; Inferior user's transmitting terminal need be set up corresponding form stores information outside band, and this information is along with authorization channel fading characteristic, primary and secondary user power and positional information and main user carry out real-time update to the change of authorization channel operating characteristic.
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| KR101538562B1 (en) | 2010-11-15 | 2015-07-21 | 인터디지탈 패튼 홀딩스, 인크 | Methods and apparatuses for spectrum sensing in an opportunistic band |
| CN102740305B (en) * | 2011-04-12 | 2017-10-03 | 中兴通讯股份有限公司 | A kind of method and device of selection time user terminal |
| CN102843697B (en) * | 2011-06-22 | 2015-09-30 | 电信科学技术研究院 | Disturbance restraining method between different system in frequency spectrum share situation and equipment |
| CN102547748B (en) * | 2012-02-15 | 2015-02-11 | 北京邮电大学 | Interference measurement and interference avoidance method based on cognitive radio technology |
| CN103024750B (en) * | 2012-12-31 | 2015-09-23 | 上海师范大学 | A kind of centralized cognition wireless network spectrum allocation may in cobasis station and Poewr control method |
| WO2016058516A1 (en) * | 2014-10-13 | 2016-04-21 | Huawei Technologies Co., Ltd. | Device, network, and method for communications with carrier sensing and coexistence |
| CN108365901B (en) * | 2017-01-26 | 2021-10-01 | 索尼公司 | Electronic device and method for spectrum management apparatus |
| CN109660946A (en) * | 2017-10-09 | 2019-04-19 | 索尼公司 | Electronic device, wireless communications method and computer-readable medium |
| CN108738060B (en) * | 2018-05-14 | 2021-06-22 | 湘潭大学 | WLAN electromagnetic radiation prediction method based on joint interference power |
| CN113411889A (en) * | 2020-03-17 | 2021-09-17 | 索尼公司 | Electronic device, wireless communication method, and computer-readable storage medium |
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| CN101325461A (en) * | 2008-07-25 | 2008-12-17 | 浙江大学 | Method for establishing and maintaining cognition radio communication link based on non-speed code |
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| CN101325461A (en) * | 2008-07-25 | 2008-12-17 | 浙江大学 | Method for establishing and maintaining cognition radio communication link based on non-speed code |
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