SINR-balancing based cooperative spectrum sharing scheme for MIMO cognitive radio systems

摘要

In order to improve the system capacity of the primary user(PU) and secondary user(SU) of multiple-input-multiple-output(MIMO) cognitive radio(CR) system,a signal to interference plus noise ratio balancing(SINR-balancing) based cooperative spectrum sharing(CSS) scheme is proposed,in which PU leases a fraction of its transmission time to SU in exchange for the SU relaying the PU's data cooperatively.The SINR-balancing based corresponding beamforming vectors are designed and time-division is also optimized for the proposed scheme.Simulation results show that compared to conventional opportunistic spectrum sharing(OSS) scheme,the proposed CSS scheme can effectively enhance the system performance of both PU and SU and provide an effective cooperation mechanism for PU and SU to determine whether to request cooperation.