presenter: msc. zeeshan ansar...zeeshan ansar folie 2 • population 25 million • largest city •...
TRANSCRIPT
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Presenter:
MSc. Zeeshan Ansar
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Folie 2
• Population 25 Million
• Largest City
• Sea Port
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Folie 3
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Folie 4
• Population 5 Million
• Capital City
• Beginning of world greatest
mountain ranges
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Folie 5
• Population 5 Million
• Capital City
• Beginning of world greatest
mountain ranges• Karakoram (highest K2 8,611 m )
• Himalayan (highest Nanga
Parbat 8,126 m)
• Hindu Kush (highest Tirich Mir 7,690 m)
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Folie 6
• K2 8,611 m
• Nanga Parbat 8,126 m)
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Folie 7
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Folie 8
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Intellectual Growth Journey
Folie 9
BSc. Telecommunication, Karachi
Worked as Network Engineer, Karachi
MSc. Communication and Signal Processing, Ilmenau
Ongoing: PhD. Specialization in wireless sensor networks, Dresden
Future: Post-Doc, Startup
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Why MSCSP
Folie 10
The Spirit of Science
Research oriented program
Ample opportunities for HiWi and student jobs Multi-cultural environment
Highly qualified and competent teaching team
Beautiful Scenic Town
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Friendly Advice
Assignments are IMPORTANT!!
Don’t be shy! Clarify any doubts with tutors
For better understanding of theoretical concepts → apply it
on MATLAB (e.g. SVD)
Develop your skills while earning money → Look for HiWi
Make new friends and enjoy every moment of this phase of
life
Folie 11
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Extensive Research Prospects
Folie 12
Internet of things
Mobile Communication RF and Antenna Design
Signal Processing
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Burst Communication
14
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Applications Health-care monitoring
Wild-life monitoring
Environmental monitoring
Smart grid
Military Surveillance
15
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Link Dynamics
6
dNoise , path loss
and mobility
Shadowing
Mote 1 Mote 2
Variation in signal strength is a possible cause of link
burstiness!
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Links are bursty
Burstiness affects protocol performance
Need a way to measure the performance
Methods to determine the size of a burst
17
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My Research
18
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Conditional Probability Base Approach (CPB)
• Conditional CDF has been proposed to describe the stable duration
of link quality
• CDF information can be utilized by MAC or application layer
• The conditional CDF of the stable duration for a given SNR is
described as:
𝐹 𝜏 𝑠𝑡ℎ = 𝑃{𝐓 ≤ 𝜏|𝐬 ≥ 𝑠𝑡ℎ}
19
SNR: signal-to-noise ratio
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20
Algorithm Design: Binary State
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21
success
failure
success
failure
Algorithm Design: Empirical CDF
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Summary: [CPB:2015]
+ Conditional CDF is utilized to model the long-term link
quality fluctuation.
+ Value of SNR threshold determines the reliability of data and
channel efficiency
- Threshold is chosen empirically which cannot be generalized
(physical links have individual aspects)
22
Conditional Probability Base Approach (CPB)
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Double Markov Based Approach K-mean clustering
23ARR: acknowledgement reception ratio
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DMB
24
S1 S2
a13
a22
a21
a23
a31 a32
a11a12
a33
• Fluctuation in link quality is described by state transition
probabilities
• SOJOURN Time or Expected State Duration (ESD)
M is the total number of states
N is the number of transitions
1
2
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DMB
25
y
S F
1-x
1-y
x
0 → 𝐹𝑎𝑖𝑙𝑢𝑟𝑒1 → 𝑆𝑢𝑐𝑐𝑒𝑠𝑠
• Example: Acknowledgment Sequence of State 1
• Equation (1) helps in finding state transition probabilities
• Equation (2) helps in finding out consecutive success (CS) and
consecutive failure (CF)
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Summary: [DMB:2015]
+ K-mean clustering is employed to model link quality
fluctuations into countable regions
+ Furthermore, two-stage Markov model determines the stable
duration and burst size
- Short-term link fluctuations are not taken into account
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Double Markov Based Approach
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O-DMB (Online-DMB)
27
Short-term link fluctuation that may not be ‘Perceived by the offline
model’
Time
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O-DMB
28
System architecture
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O-DMB
29
Transmission Technique
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+ Hybrid approach models both long-term and short-term link
quality fluctuations
+ Long-term link quality fluctuations can be modelled using
offline approach
+ Short-term link quality fluctuations can only be dealt through
real-time feedback
30
Summary: [O-DMB:2015]
O-DMB (Online-DMB)
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Experiments
31
Parameters Indoor Outdoor
Packet Sent 120,000 120,000
Inter-PacketInterval
20,50,100 (ms) 20,50,100 (ms)
Packet Size 28 bytes 28 bytes
Transmission Power (dBm)
-15,-10,3,0 -15,-10,3,0
Distance (m) 30,20,10 35,27,19,8
Parameter Settings for
Experiments
Outdoor
Indoor
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Results (Static scenario)Throughput
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Results(Static scenario)Energy
33
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Thankyou for your attention…