1. 0
Cognitive Radio
Wireless Future
Prepared By : Abdelrahman Fady

2. Agenda
• Introduction
• SDR Concept
• CR Concept
• CR versus IA
• CR Advantages
• CR Applications
• Q&A
2

3. Many services are requested e.g.
• Mobile Broadband
• M2M
• Large capacity
• Users interventions
All this with
• Limited spectrum
3
Introduction

4. Spectrum importance
Here we will see how Cognitive radio will help in catching this
future , Let’s start the journey 4
Introduction

5. • What is SDR…?
SDR is software defined radio, where single radio might be
configured to work on different bands, frequencies or in
different technologies and this configuration might be changed
as per need.
• in SDR the software able to change
• Security
• Modulation
• Processing
• frequency
• Wave form
5
SDR Concept

6. • SDR advantages
• Simple network architecture
• Easy configuration
• Less complexity
• Easy upgrade
• SDR disadvantages
• Still there is no automation and change need user intervention
• Always needs multi band antenna
6
SDR Concept

7. • SDR applications
• All new Cabinets
provided by mobile
vendor use this
concept
7
SDR Concept

8. • Definition
We can say cognitive radio is
the radio that aware of its
surroundings and adapts
intelligently adapts to new
waveform.
The motivator behind this is
existence of under utilized
spectrums as well congested
ones and this is extremely
impacting networks
performance
8
Cognitive Radio(CR)Concept

9. • Fundamental of CR processes
• Ability to sense the
environment
• Evaluate options
• Implement chosen waveform
9
Cognitive Radio(CR)Concept

10. • How does the CR operation works?
10
Cognitive Radio(CR)Concept

11. • Cognitive radio key algorithms
• Sensing Algorithms
• Cross Layer Control solution
11
Cognitive Radio(CR)Concept

12. 12
Cognitive radio versus smart
antennas
Point Cognitive radio (CR) Intelligent antenna (IA)
Principal goal Open spectrum sharing Ambient spatial reuse
Interference processing Avoidance by spectrum sensing
Cancellation by spatial
pre/post-coding
Key cost
Spectrum sensing and multi-
band RF
Multiple- or cooperative-
antenna arrays
Challenging algorithm Spectrum management tech
Intelligent spatial
beamforming/coding tech
A smart antenna is an antenna technology that uses spatial beam-
formation and spatial coding to cancel interference; however, it requires
an intelligent multiple- or cooperative-antenna array. On the other hand,
cognitive radio allows user terminals to sense whether a portion of the
spectrum is being used to share spectrum with neighbour users.

13. • Improving spectrum
utilization & efficiency
• Improving link reliability
• Less expensive radios
• Advanced network topologies
• Enhancing SDR techniques
• Automated radio resource
management.
• Advanced interoperability
13
CR Advantages

14. • Some CR applications
• Extending mobile
networks
• Open air events
• Mobile video services
• Military application
• Multi-technology phone
• Emergency radio system
14
CR Applications

15. 15
Q&A

16. 16