Dual Polarization Frequency Reuse in SATCOM: A Method to Counter Poor Cross-Polar Isolation

Abstract

Utilizing orthogonal polarizations is a well-known frequency reuse technique in satellite communications (SAT-COM) to provide additional spectrum in a given geographical region. However, in practice there will be a link degradation due to cross talk between the two polarization channels. The cross talk results from the combined effects of the antenna's imperfect ability to distinguish between the two polarizations and channel depolarization effects. Greater cross-polar isolation (XPI) reduces the link degradation in terms of the received signal to noise plus interference ratio (SNIR). The effect of cross talk can be significant, limiting the benefits of using orthogonal polarizations. In this paper we evaluate the XPI impact in terms of received SNIR when using orthogonal polarizations. We then propose the use of a multiple input multiple output (MIMO) singular value decomposition technique (SVD) to mitigate the XPI impact.

$8\times8\,\,Ka$ -Band Dual-Polarized Array Antenna Based on Gap Waveguide Technology

“…Utilizing two orthogonal polarizations is a widely used technique in SATCOM to provide additional spectrum in a given geographical region [3]. In that case, dual-polarized antennas allow to save costs and space, compared to the scheme where one dedicated antenna is used to each polarization.…”