发射波束赋形消除感知用户对主用户干扰算法

针对如何完全消除感知用户对主用户的干扰问题，探讨了如何利用发射端的波束赋形消除感知用户对主用户的干扰。给出了感知网络和主用户网络共存的系统模型和一种最佳波束赋形算法。并对这种最佳波束赋形算法进行了性能仿真，仿真结果表明，该算法较迫零波束赋形算法在性能上更有优势。与经典的迫零波束赋形方法比较，该算法既能消除对主用户的干扰，提高了感知用户自身的性能。

Primary User Interference from Cognitive User Elimination Algorithm Based on Transmit Bearnforming

Cognitive users can opportunistically utilize the unused spectrum resources without causing interfer- ence to primary user or affecting primary user＇s communication. How to apply transmit beamforming to eliminate the primary user interference from cognitive user is the key. Firstly, the system model that the cognitive user net- work coexists with primary user network was developed. Then, an optimal beamforming algorithm that can com- pletely eliminate the primary user interference from cognitive user was proposed. Compared with calssical zero- forcing beamforming algorithm, the proposed algorithm not only can eliminate the the primary user interference from cognitive user, but can improve the performance of itself. Finally, a performance simulation of the optimal beamforming algorithm was present. The result shows that the proposed algorithm has a better performance than zero-forcing beamforming.