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primary transmitter.
Spectrum sensing schemes either detector the primary transmitter or receiver.
In practice, the CSI between primary transmitter and secondary receiver can be obtained at the secondary transmitter by sensing the primary transmitter-emitted signal.
Figure 4 Detection Probability of for Transmitter Independent Energy Detection when Sensed Signal from (a) Primary Transmitter only and (b) Primary Transmitter or Receiver.
However, we assume that the signal of one primary transmitter is decodable at the secondary receiver.
Without loss of generality, assume this is the first primary transmitter.
We let PU-Tx and PU-Rx denote the primary transmitter and receiver, respectively.
where P ξ denotes the interference power from the primary transmitter to the SU destination.
A direct propagation path exists between the primary transmitter (PT) and primary receiver (PR).
where H2(f) is the channel frequency response between the primary transmitter and CR receiver.
If the signal of the primary transmitter is detected, the secondary transmitter prevents the transmission.
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