认知无线电中发射端多波束形成算法及接收端低旁瓣波束形成算法
Multi Beam Transmit Beamforming and Low Sidelobe Receive Beamforming Algorithm in Cognitive Radio

在认知用户基站发射端，针对多用户产生多波束使每个波束的主瓣方向对准目标信号 而零陷对准干扰方向，实现多用户同频通信从而提高频谱的利用率。而接收端需要波束形成 算法具有抗干扰的能力，因此，本文提出了适用于授权用户基站接收端的低旁瓣波束形成算 法，在主用户面对干扰时，其接收信号质量不会大幅下降。仿真实验验证了本文的算法。
I n CR networks, a transmitting and receiving beamforming algorithm is proposed. I n tran smitting beamforming, a multi beam algorithm is proposed to send different sign als to different secondary users. In receiving beamforming, a low side lobe beamformin g a lgorithm is presented. To avoid the interference when primary and secondary users share the same spectrum, the problem of transmitting beamforming is transf orme d i nt o the one that can be solved by CVX toolbox. In receive beamforming, based on the method of array pattern optimization, a low side lobe level rec e iving beamforming algorithm is proposed in primary base station to suppress the wh ite noise an d unexpected interference. Extensive numerical results using simulated wireless channels in two dimensions are presented to verify the effectiveness of the algo rithm.