This SpringerBrief examines the active cooperation between users of
Cooperative Cognitive Radio Networking (CCRN), exploring the system
model, enabling techniques, and performance.
The brief provides a systematic study on active cooperation between
primary users and secondary users, i.e., (CCRN), followed by the
discussions on research issues and challenges in designing
spectrum-energy efficient CCRN. As an effort to shed light on the design
of spectrum-energy efficient CCRN, they model the CCRN based on
orthogonal modulation and orthogonally dual-polarized antenna (ODPA).
The resource allocation issues are detailed with respect to both models,
in terms of problem formulation, solution approach, and numerical
results. Finally, the optimal communication strategies for both primary
and secondary users to achieve spectrum-energy efficient CCRN are
analyzed.