卫星导航定位信息辅助的协作波束赋形算法

Cooperative beamforming algorithms using the assistant information from satellite navigation positioning systems

在协作通信系统中引入波束赋形技术可提高系统的覆盖率和接收端的信噪比,而传统波束赋形算法需要测量信道状态,且通过复杂的矩阵分解获得最佳波束赋形矩阵.提出了一种非信道状态信息的基于卫星导航信息辅助的协作波束赋形算法,借助卫星导航定位信息辅助,从确定空间码本中选择最佳码字作为波束赋形矩阵.仿真结果表明,所提算法在误比特率为10-4时,性能改善大于1.5dB,同时大大降低了计算复杂度.

The application of beamforming in cooperative communication systems can expand the coverage and increase the SNR of the receiver. The conventional beamforming algorithms need full or half knowledge of channel state information（CSI）, and get optimal beamforming matrices by complex matrix decomposition algorithms. So, this paper proposes a cooperative beamforming algorithm called the SIA-CBF, based on satellite navigation positioning information, without the CSI. The proposed scheme, with the satellite navigation information assistance, chooses the optimal codebook vector from the fixed codebook as the beamforming matrix. Certainly, the vector should have the maximum correlation with the direction of arrival of signal. Simulation results demonstrate that when the BER is 10^-4, the performance gain is more than 1.5 dB, and meanwhile, computational complexity is significantly decreased.