Zero differential orthogonal searching scheme for optimal polarization based on the polarization ratio parameters

For the signal-to-interference-and-noise-ratio (SINR) equation based on the polarization ratio parameters, an optimal polarization scheme called zero differential orthogonal searching (ZDOS) was suggested and discussed in detail. There are three key points in ZDOS: the global optimal point of the SINR is approached to by the first optimization along a special line, then the searching processes are designed along two orthogonal lines to search the minimal differential in each direction, and this searching method uses only the last local optimal solutions simply. Many experiments were made, and the range of the parameters was given. These experimental results show that ZDOS scheme takes generally several steps to reach the global optimum.