Underlay Cognitive Radio with Full or Partial Channel Quality Information

[摘要] Underlay cognitive radios (UCRs) allow a secondary user to enter a primary user's spectrum throughintelligent utilization of multiuser channel quality information (CQI) and sharing of codebook. The aimof this work is to study two-user Gaussian UCR systems by assuming the full or partial knowledge ofmultiuser CQI. Key contribution of this work is motivated by the fact that the full knowledge of multiuserCQI is not always available. We first establish a location-aided UCR model where the secondary user isassumed to have partial CQI about the secondary-transmitter to primary-receiver link as well as full CQIabout the other links. Then, new UCR approaches are proposed and carefully analyzed in terms of thesecondary user's achievable rate, denoted byC2, the capacity penalty to primary user, denoted byΔC1, and capacity outage probability. Numerical examples are provided to visually compare the performanceof UCRs with full knowledge of multiuser CQI and the proposed approaches with partial knowledge ofmultiuser CQI.

[学科分类] 电子、光学、磁材料