This SpringerBrief investigates advanced sensing techniques to detect
and estimate the primary receiver for cognitive radio systems. Along
with a comprehensive overview of existing spectrum sensing techniques,
this brief focuses on the design of new signal processing techniques,
including the region-based sensing, jamming-based probing, and
relay-based probing. The proposed sensing techniques aim to detect the
nearby primary receiver and estimate the cross-channel gain between the
cognitive transmitter and primary receiver. The performance of the
proposed algorithms is evaluated by simulations in terms of several
performance parameters, including detection probability, interference
probability, and estimation error. The results show that the proposed
sensing techniques can effectively sense the primary receiver and
improve the cognitive transmission throughput. Researchers and
postgraduate students in electrical engineering will find this an
exceptional resource.