The Throughput Potential of Cognitive Radio: A Theoretical Perspective
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Citations
Capacity of an Orthogonal Overlay Channel
Joint Secrecy for D2D Communications Underlying Cellular Networks
A software radio design for communications in uncoordinated networks
Universidade tecnológica federal do paraná programa de pós-graduação em engenharia elétrica e informática industrial
Interference impact on the outage capacity of a frequency diversity paradigm in cognitive radio networks
References
Cognitive radio: brain-empowered wireless communications
Cognitive Radio An Integrated Agent Architecture for Software Defined Radio
Collaborative spectrum sensing for opportunistic access in fading environments
Achievable rates in cognitive radio channels
Agility improvement through cooperative diversity in cognitive radio
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Frequently Asked Questions (10)
Q2. What is the possible throughput of the two switch interweave model?
Since the transmitter in the two switch interweave model does not transmit when the primary user is active, the achievable throughput Ctwo switch is independent of x.
Q3. What is the defining assumption in the overlay technique?
The defining assumption made in the overlay models [7], [9] is that the secondary transmitter has noncausal knowledge of the primary user’s transmissions, i.e., the primary message W1 is known a priori to the secondary transmitter.
Q4. What is the primary receiver's use of dirty paper coding?
the secondary transmitter uses dirty paper coding on its own message to eliminate interference at the secondary receiver.
Q5. What is the primary message knowledge used to null the interference at the secondary receiver?
The primary message knowledge at the secondary transmitter is used to effectively null the interference at the secondary receiver by using dirty paper coding [7].
Q6. What is the genie bound on the capacity of the cognitive link?
Suppose the genie provides the receiver with the transmitter state st once every Tc channel uses in the genie variable G. Since the receiver has knowledge of both the transmitter state and receiver state, the authors have Cst,(sr,G) = Cst,∗.
Q7. What is the primary transmitter’s role in the overlay technique?
In this approach, the secondary transmitter uses a part of its power to relay the primary user’s message to the primary receiver.
Q8. What is the correlation between the transmitter and receiver state?
The correlation between the transmitter state st and the receiver state sr is a measure of the distributed nature of the system - if the transmitter and receiver are far apart, the more distributed the primary activity and therefore the lower the correlation.
Q9. What is the cost of acquiring non-causal interference knowledge?
The cost of acquiring this non-causal interference knowledge is the fraction of time ν that must be spent listening to the primary user’s transmissions.
Q10. What is the difference between the selfish approach and interweave techniques?
Since all the available power in the selfish approach is used for secondary transmissions, the Cselfishoverlay curves represent an upperbound on the secondary user’s capacity.