Performance Analysis of MIMO Spectrum-Sharing Networks With Pre-Whitened Interfering Signals Under Outdated Channel Information

In this letter, the performance of multiple-input multiple-output based spectrum-sharing networks is analyzed when pre-whitening of spatially correlated interfering signals is performed at the secondary user transmitter (ST) using outdated channel state information (CSI). The channel capacities and outage probabilities are derived for both primary and secondary systems under maximum transmission power and peak interference constraints of the ST and primary system, respectively. It is shown that the reliability of interfering CSI at ST renders a performance gain of the secondary system, while the minimum performance limit of the primary system is maintained under peak interference constraint for sufficiently high maximum transmission power of ST. Finally, the analytical results are validated by the simulation results.