Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.

No, thanks

The new sensing scheme in decentralized cooperative congnitive radio

No description
by

JUN YEON KIM

on 20 November 2014

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of The new sensing scheme in decentralized cooperative congnitive radio

The new sensing scheme in decentralized cooperative cognitive radio
Contents
1. The ML system
2. The V-Blast system
3. The MRRC and Alamouti system
4. Single spectrum sensing
5. Cooperative spectrum sensing
6. Decentralized cooperative
spectrum sensing
7. Decentralized cooperative
spectrum sensing in reporting channel
8. The new spectrum sensing
9. The paper
10. Reference

1. The ML system
System and
Simulation
200901030 김준연
ML -> Maximum Likelihood
ML system is the technique to consider all possible
vector symbol
It has very high performance
The calculation can be increased in exponentially based on the
number of the antennas
It is impossible to make in hardware
Definition and
Characteristic
This is the equation that the subtract y(transmitted signal) and Hx (multiply channel with symbol)to get the real transmitted signal value
As a result, we can get the very high performance value
ML has more good performance
than ZF and MMSE
2. The V-Blast system
System and
Simulation
OSIC -> Ordered Successive Interference Cancellation
OSIC : This is the technique to detect the signal in a row and delete the detected signal from the received signal
V-Blast -> Vertical Bell Laboratories Layered Space Time
V-Blast : This is the one of the technique in the OSIC
: It is very similar with ML but the quantity of calculation is
low than ML
The order of the V-Blast
1. At first, calculate the SINR to detect the biggest value in signals.
2. Second, delete the detected signal from received signal
3. Do this procedure until get the real value
Definition and
Characteristic
V-Blast has more good performance than ML
System and
Simulation
MRRC has more good performance
The difference between MRRC and Alamouti is 3dB
The reason is that Almouti systems twice more power than MRRC

4. Single Spectrum Sensing
What is single spectrum sensing?
: Find empty frequency to improve efficiency of telecommunication system

The content of spectrum sensing
: PU(Primary User) -> It is a user who uses the frequency
: SU(Secondary User) -> It is a user who wants to find the empty frequency
: FC(Fusion Center) -> It is the center that all result of detection is collected
and makes final decision
Single
Spectrum Sensing
System and
Simulation
I will comparison Pd(k) with Pf(k)
Those things symbolize the probability of detection and false alarm
It is ROC(Receiver Operating Characteristic) curve
In this graph I will comparison 'Probability of detection' and 'Probability of false alram'
If the false alarm probability is low and the detection probability is high, it is a good system
AWGN channel
Rayleigh fading channel
Setting of the matlab program
5. Cooperative Spectrum Sensing
What is cooperative spectrum sensing?
: All of the SU participate in the spectrum sensing in the single spectrum sensing
: But at cooperative spectrum sensing system SUs make cluster and only clusters
participate in the spectrum sensing

The advantage of the cooperative spectrum sensing
: The quantity of the traffic can be low
: The energy to detect signal can be low
Cooperative
Spectrum Sensing
System and
Simulation
3. The MRRC and Alamouti system
MRRC -> Maximal Ratio Receiver Combining
MRRC : It is single-input, multiple-ouput system (SIMO)
Alamouti : It is multiple-input, single-output system(MISO)
Definition and
Characteristic
This is the matlab code the cooperative spectrum sensing
It is very simple equation to make matlab code
OR-Rule has very good performance
It is considered ideal type in the cognitive radio
6. Decentralized Cooperative Spectrum Sensing
What is decentralized cooperative spectrum sensing?
: At cooperative spectrum sensing system only cluster heads(CH) do the spectrum
sensing
: But at decentralized cooperative spectrum sensing FC(Fusion Center) also dose
the spectrum sensing
: As a result, the spectrum sensing is proceeded twice when the signal is
transmitted from SU to FC



Decentralized
Cooperative
Spectrum Sensing
System and
Simulation
The equation of the Rule
OR Rule has the highest performance
OR-Majority Rule also has the good performance
The equations for rules is transformed like this in the matlab code
7. Decentralized Cooperative Spectrum Sensing
in reporting channel
What is decentralized cooperative spectrum sensing in reporting channel?
: To suppose real situation, I will suppose the reporting channel
: The value of the result will be low than before, but it is meaningful to use
practically

Decentralized
Cooperative
Spectrum Sensing
in reporting channel
System and
Simulation
The equations are a little bit different with decentralized cooperative spectrum sensing
The result graph shows that this technique has the limited performance
So, the performance will be low when we consider real situation
As a result, I will make more good performance of this technique
8. New Spectrum Sensing
What is new spectrum sensing?
: It is the technique that makes more good performance in reporting channel
How
: The critical value of this system is limited
: So I can get the critical value like this equations




Suggestions
: This is the critical reporting error
: If the signal has low value than critical reporting error, I will only detect this value
: As a result, all of the cluster do not participate in the spectrum sensing and only
limited cluster will participate in the spectrum sensing




Final Offer
: k is the number of the cluster which participate in the spectrum sensing
: This equation alleviates the performance of this technique
(α has 0 < α < 1 this value and this technique has adequate k value in all of the situation)
New
Spectrum Sensing
System and
Simulation
This is the code to find adequate k value
This is the code for suggested equation
This is the code to detect the signal
The performance is really better than before
These is no limited value in this result graph
As a result, all of the cluster don't have to participate in the spectrum sensing so the traffic is lower than before
9. Paper
I had wrote the paper about new spectrum sensing technique
I submitted this paper to 'The Korean Institute of communications and Information Sciences' at 5th June.
10. Reference
[1] J. Mitola, “Cognitive Radio for Flexible Mobile Multimedia Communications,” in Proc. Of IEEE workshop on Mobile Multimedia commun., Nov. 1999.

[2] K.Letaief, W.Zhang, “Cooperative Communication for cognitive Radio Networks”, Proceedings of the IEEE, vol. 97, pp. 878-893, May 209

[3] W. Zhang, R. K. Mallik, K. B. Letaief, “Optimization of Cooperative Spectrum Sensing with Energy Detection in Cognitive Radio Networks,” IEEE
Transactions Wireless Communications, vol. 8, pp. 5761-5766, Dec. 2011.

[4] 김낙균, 변윤식, “Cognitive Radio 시스템의 분산 협력 스펙트럼 센싱을 위한 최적의 임계 값 도출”, 신호처리합동학술대회, pp.97-101, Oct.2013

[5] 최로미, 변윤식,” 인지 무선 네트워크에서 보고 오류를 고려한 OR 규칙 기반의 협력 스펙트럼 센싱 기법 한국통신학회논문지(J-KICS) '14-01 Vol.39A No.01,pp19-27, Feb.2014

[6] 김낙균, 변윤식, “Cognitive Radio 네트워크 시스템의 새로운 분산협력스펙트럼 센싱 기법,” JCCI, April. 2014.





The kind of the decentralized cooperative spectrum sensing
: AND-Rule -> If all of the signal is 1, the result signal is 1
: OR-Rule -> If only one signal is 1, the result signal is 1
: Majority-rule -> If half of the signal is 1, the result signal is 1
Thank you!!!!!
Full transcript