Advanced beam-forming technology with cross-polarization cancellation schemes

摘要

An advanced digital beam forming technique is achieved that is capable of simultaneously forming multiple beams and attenuating the cross-pol component at multiple locations. The proposed invention, comprising a series of signal inputs, optimization loops and weighting processes, successfully eliminates the side effect of an increase of the cross-pol in the process of beam-forming, thus reducing potential interference. This technique utilizes the orthogonally polarized signal component which is already available and can minimize both the horizontally polarized and vertically polarized cross-pol at the same time. The complexity of computation can be reduced by using only part of the orthogonal polarized components in the optimization.

主权项

1. A beam-forming technique for a radio frequency terminal, comprising:
an antenna array comprising a plurality of antenna elements, each of the antenna elements comprising a first port and a second port for receiving or transmitting a signal, the signal comprising a first co-pol component, a first cross-pol component, a second co-pol component and a second cross-pol component, the first co-pol component and the second cross-pol component having a first polarization, the second co-pol component and the first cross-pol component having a second polarization, the first polarization being orthogonal to the second polarization, each of the antenna elements receiving or transmitting the first co-pol component and the second cross-pol component via the first port and receiving or transmitting the second co-pol component and the first cross-pol component via the second port; and a transceiver system coupled to the antenna array, the transceiver system comprising:
a digital beam forming processor having a first input and a second input, the digital beam forming processor receiving the first co-pol components from the antenna elements via the first input and the first cross-pol components from the antenna elements via the second input, the digital beam forming processor applying a beam weight vector to the first co-pol components to generate a first output signal comprising updated first co-pol components, while simultaneously applying the beam weight vector to the first cross-pol components to generate a second output signal comprising updated first cross-pol components; andan optimization module coupled to the digital beam forming processor, the optimization module receiving the first output signal and the second output signal and computing an updated beam weight vector based on adaptive algorithms and providing the updated beam weight vector to the digital beam forming processor.