SRI BALAJI COLLEGE OF ENGINEERING AND TECHNOLOGY

A SEMINAR ON

COGNITIVE RADIO

SUBMITTED TO :- SUBMITTED BY :- TEJPAL JHAJHRIA POORAN CHAND

What is Cognitive Radio

CR can be defined as “…a radio that is aware of its surroundings and adapts intelligently”. This may require adaptation and intelligence at all the 7 layers of the “OSI” model.

working definition is:- “A CR uses intelligent signal processing (ISP) at the physical layer of a wireless system and is achieved by combining ISP with software defined radio (SDR)”.

Cognitive Radio• A radio that is aware of “meaning” behind radio

parameters

– Capable of determining the relative effect that each parameter will have

• modulation, bandwidth

• Cognitive radio provides a framework for a device to evaluate tradeoffs in the creation of dynamically-created links.

• Fundamental to these processes:– Ability to sense environment– Evaluate options– Implement chosen waveform

NormalUrgent

Cognitive Radio Operation

Allocate ResourcesInitiate Processes

OrientInfer from Context

Parse Stimuli

Pre-processEstablish Priority

PlanNormal

Negotiate

Immediate

LearnNewStates

Negotiate Protocols

Generate AlternateGoals

Observe

OutsideWorld

Decide

Act

User Driven(Buttons)

Autonomous Determine “Best” Plan

Infer from Radio Model

States

Determine “Best” Known WaveformGenerate “Best” Waveform

Cognitive Radio Operation

Allocate ResourcesInitiate Processes

Observe

OutsideWorld

Decide

Act

User Driven(Buttons) Autonomous

Determine “Best” Known Waveform

Cognitive Radios in Networks• Benefits

– Improved spectrum utilization

– Improve QoS• Many decisions may

have to be localized– Distributed behavior

• Adaptations of one radio can impact adaptations of others– Interactive decisions– Difficult to predict

performance

•Experiment with wideband RF tuning architectures (for wideband sensing, multichannel communications, etc.)•High performance reconfigurable computing architectures•High capacity switching networks•Open source development (linux, eCos )•Cellular communications

USE OF COGNITIVE RADIO

Application of cognitive radio

1.ExtendingMobileNetwork2. Over Night Back-Up System3. Outside Broad casting4. Open-air Events5. Mobile Video Services6. Covert Military Radio7. Emergency Radio System8. Multi technology Phone

BENEFIT OF THE COGNITIVE RADIO

•OPTIMAL DIVERSITY

•SPECTRUM EFFICIENCY

•IMPROVED QoS

•BENEFITS TO THE SERVICE PROVIDER

•BENEFITS TO THE REGULATOR