1 research outputs found
Indirect Channel Sensing for Cognitive Amplify-and-Forward Relay Networks
In cognitive radio network the primary channel information is beneficial. But
it can not be obtained by direct channel estimation in cognitive system as
pervious methods. And only one possible way is the primary receiver broadcasts
the primary channel information to the cognitive users, but it would require
the modification of the primary receiver and additional precious spectrum
resource. Cooperative communication is also a promising technique. And this
paper introduces an indirect channel sensing method for the primary channel in
cognitive amplify-and-forward (AF) relay network. As the signal retransmitted
from the primary AF relay node includes channel effects, the cognitive radio
can receive retransmitted signal from AF node, and then extract the channel
information from them. Afterwards, Least squares channel estimation and sparse
channel estimation can be used to address the dense and sparse multipath
channels respectively. Numerical experiment demonstrates that the proposed
indirect channel sensing method has an acceptable performance.Comment: 5 pages, 5 figure