Exact(5)
Let denote the preadaptation secondary received SNR with average secondary transmit power.
The secondary transmit power ranges from 0 dB to 10 dB.
To reduce P I, we adopt the back-off technique, i.e., reducing the secondary transmit power to obtain acceptable interference.
Between these objectives, the former is of higher priority, making strict regulation of secondary transmit powers necessary [4].
In the MISO case, under an average secondary transmit power constraint and an interference temperature constraint at each PU-Rx, beamforming was proved to be the optimal strategy.
Similar(55)
Note that secondary users transmit (if P1>0) even when all channels are detected as busy.
In the first transmission phase, the primary transmitter and the secondary transmitter transmit the primary signal and the secondary signal, respectively.
A cognitive multi-access network in which a primary user and a secondary user transmit to a common receiver is considered.
SIC is performed at the receiver in the case when both the primary and the secondary users transmit at the same time.
With this knowledge and using advanced signal processing techniques[8, 9], the secondary can transmit concurrently with the primary, without considerably harming its performance[4].
Based on our initial assumption of availability of at the secondary transmitter, transmit power in the th mode can be easily determined.
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