空域反相对称法应用研究

The Application Research on Phase-Inversion Symmetric Method(PISM)in Airspace

现有的空间分集系统为避免信道噪声的相关性,要求天线间距足够大;而反相对称法则是利用噪声的相关性来抑制噪声的,因此天线间距可以较小。实验证实:当天线间距小于半波长时,噪声相关系数可以达到0.80以上。经理论分析,此时利用反相对称法可使系统输出信噪比提高4.5倍以上,仿真结果验证了系统的抗噪声性能。

In order to avoid the correlation of channel noise,the traditional space diversity system requires that the antenna spacing is large enough,while the phase-inversion symmetric method inhibits the noise just by using the correlation,so the antenna spacing could be smaller.The tests show that when the antenna spacing is less than half of the wavelength,the correlation coefficient of the noise in the adjacent space could reach 0.80 or more.Through the theoretical analysis,it is proved that the system output could receive more than 4.5 times of the SNR gain with using PISM,and the simulation results verify the anti-noise performance of the system.