performance analysis of energy detector in relay based cognitive radio networks
DESCRIPTION
Performance Analysis of Energy Detector in Relay Based Cognitive Radio Networks. Saman Atapattu Chintha Tellambura Hai Jiang. Outline. Introduction System model Detection analysis Upper bound ROC curves Conclusions. Heavy Use. Heavy Use. Less than 6-10% Occupancy. Sparse Use. - PowerPoint PPT PresentationTRANSCRIPT
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Performance Analysis of Energy Detector in Relay Based Cognitive Radio Networks
Saman AtapattuChintha Tellambura
Hai Jiang
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Outline
Introduction System model Detection analysis Upper bound ROC curves Conclusions
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Radio Spectrum Primary user / license
holder Occupancy of spectrum
(below 1 GHz) is around 6~10%.
Spectrum holes Spectrum under
utilization
Maximum Amplitudes
Frequency (MHz)
Am
pli
du
e (
dB
m)
Heavy Use
Sparse Use
Heavy Use
Medium Use
Less than 6-10% OccupancyLess than 6-10% Occupancy
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Cognitive Radio
“A radio that can change its transmitter parameters based on the environment in which it operates”.
Cognitive radio Secondary network Unlicensed users
Spectrum Sensing…?
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Spectrum Sensing
Multipath fading & shadowing. Hidden terminal problem.
PU should not be effected by secondary activities. Reliability
Decision based on the received signal
Ho = Primary user is absent (idle)
H0: Y [n] = W [n]H1 = Primary user is in operation (busy)
H1: Y [n]= h X [n] + W [n]
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Cooperative Spectrum Sensing (CCS)
Mitigate multipath fading & shadowing by spatial diversity.
Avoid hidden terminal problem.
Shadowing Shadowed node
Cooperative nodes
Improve reliability and detection capability.
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Sensing Techniques
Matched filter: SU has a prior knowledge of the
PU, coherent detection.
Cyclostationary detection: PU exhibits strong
cyclostationary properties.
Covariance detection: the statistical covariance matrices of the signal and noise.
Energy detection: the received signal strength.
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Sensing Techniques
Matched filter: SU has a prior knowledge of the
PU, coherent detection.
Cyclostationary detection: PU exhibits strong
cyclostationary properties.
Covariance detection: the statistical covariance matrices of the signal and noise.
Energy detection: the received signal strength.
Non-coherent Low complexity
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Relay-based CCS
Data fusion AF relaying in cooperative communications
Relay Fixed gain (blind/semi blind)Variable gain
Combining MRC/ SLC
Filtering Energy detector Multipath fading
Rayleigh/ Nakagami-m Ri to CC (i=1, …, n) channel
Orthogonal (TDMA) Relay links Relay links + Direct link
System Model
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Energy Detector
Output is compared to the predefined threshold. Non-coherent, optimal, low signal processing.
Binary hypothesis
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Performance Metrics
Test statistic
False alarm probability:
Detection probability:
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Detection Analysis Detection:
Average detection probability:
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Detection Analysis Detection:
Average detection probability:
Contour integration: Residue theorem
Moment generating function (MGF)
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MGF Variable gain
Fixed gain
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Upper Bound for Pd
Case 1: Multiple-relay Case 2: Multiple-relay + Direct link
SNR:
MGF:
Upper bound: Case 1
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0 0.2 0.4 0.6 0.8 10
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Pf
Pd
Exact (simulations)Upper Bound (analytical)
n = 1
ROC curves for different number of cognitive relays (n)
u=2, average SNR = 5 dB and fixed gain C=1.7
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0 0.2 0.4 0.6 0.8 10
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Pf
Pd
Exact (simulations)Upper Bound (analytical)
n = 1
ROC curves for different number of cognitive relays (n)
u=2, average SNR = 5 dB and fixed gain C=1.7
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0 0.2 0.4 0.6 0.8 10
0.1
0.2
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0.4
0.5
0.6
0.7
0.8
0.9
1
Pf
Pd
Exact (simulations)Upper Bound (analytical)
n = 1, 2
ROC curves for different number of cognitive relays (n)
u=2, average SNR = 5 dB and fixed gain C=1.7
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0 0.2 0.4 0.6 0.8 10
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Pf
Pd
Exact (simulations)Upper Bound (analytical)
n = 1, 2
ROC curves for different number of cognitive relays (n)
u=2, average SNR = 5 dB and fixed gain C=1.7
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0 0.2 0.4 0.6 0.8 10
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Pf
Pd
Exact (simulations)Upper Bound (analytical)
n = 1, 2, 3, 4, 5
ROC curves for different number of cognitive relays (n)
u=2, average SNR = 5 dB and fixed gain C=1.7
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0 0.2 0.4 0.6 0.8 10
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Pf
Pd
Exact (simulations)Upper Bound (analytical)
n = 1, 2, 3, 4, 5
ROC curves for different number of cognitive relays (n)
u=2, average SNR = 5 dB and fixed gain C=1.7
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0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
0.1
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Pf
Pd
n = 1 + direct linkn = 3 + direct link
Direct link SNR = -5 dB
ROC curves for relay links + direct link
u=2, average SNR = 5 dB and fixed gain C=1.7
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0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
0.1
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Pf
Pd
n = 1 + direct linkn = 3 + direct link
Direct link SNR = -5, -3 dB
ROC curves for relay links + direct link
u=2, average SNR = 5 dB and fixed gain C=1.7
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0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
0.1
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Pf
Pd
n = 1 + direct linkn = 3 + direct link
Direct link SNR = -5, -3, 0 dB
ROC curves for relay links + direct link
u=2, average SNR = 5 dB and fixed gain C=1.7
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0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
0.1
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0.8
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Pf
Pd
n = 1 + direct linkn = 3 + direct link
Direct link SNR = -5, -3, 0, 3 dB
ROC curves for relay links + direct link
u=2, average SNR = 5 dB and fixed gain C=1.7
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0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
0.1
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Pf
Pd
n = 1 + direct linkn = 3 + direct link
Direct link SNR = -5, -3, 0, 3 dB
n =1
n =3
ROC curves for relay links + direct link
u=2, average SNR = 5 dB and fixed gain C=1.7
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Conclusions
The MGF of received SNR of the primary user’s signal is utilized to analyze the average detection probability.
Tighter upper bound is derived.
Sensing capability is increased with spatial diversity.
Direct link has major impact of the detection capability.
Analysis can be extended to multihop relaying.
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References[1] S. Haykin, “Cognitive radio: Brain-empowered wireless communications,” IEEE
J. Select. Areas Commun., vol. 23, no. 2, pp. 201–220, Feb. 2005.
[2] H. Jiang, L. Lai, R. Fan, and H. V. Poor, “Optimal selection of channel sensing order in cognitive radio,” IEEE Trans. Wireless Commun., vol. 8, no. 1, pp. 297–307, Jan. 2009.
[3] J. N. Laneman, D. N. C. Tse, and G. W. Wornell, “Cooperative diversity in wireless networks: Efficient protocols and outage behavior,” IEEE Trans. Inform. Theory, vol. 50, no. 12, pp. 3062–3080, Dec. 2004.
[4] G. Ganesan and Y. Li, “Cooperative spectrum sensing in cognitive radio, part I: Two user networks,” IEEE Trans. Wireless Commun., vol. 6, no. 6, pp. 2204–2213, June 2007.
[5] F. F. Digham, M.-S. Alouini, and M. K. Simon, “On the energy detection of unknown signals over fading channels,” IEEE Trans. Commun., vol. 55, no. 1, pp. 21-24, Jan. 2007.
[6] C. Tellambura, A. Annamalai, and V. K. Bhargava, “Closed form and infinite series solutions for the MGF of a dual-diversity selection combiner output in bivariate Nakagami fading,” IEEE Trans. Commun., vol. 51, no. 4, pp. 539–542, Apr. 2003.
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Thank you
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Questions