Beam forming methods and apparatuses
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsSven Petersson, Bjorn Johannisson
Life of this patent
Estimating the term…
Abstract
A method is provided for using an antenna array to create two beams (a first beam and a second beam). In one aspect, the method uses dual polarization beam forming, which allows for many degrees of freedom in designing a desired power pattern. The method is well suited for systems with multiple radio chains (e.g., systems with active antennas). The method is also well suited for multi-port systems such as TD-SCDMA. In some embodiments, the method produces two beams where (a) the shape of the power beam pattern for the first beam and the shape of the power beam pattern for the second beam are the same (or substantially the same) in a plurality of directions of interest and (b) the beams have orthogonal (or substantially orthogonal) polarizations in the coverage area.
Claims22
A method for creating two beams, a first beam and a second beam, the method comprising:
- creating said first beam and said second beam using an antenna array, wherein
- the antenna array comprises:
- a first antenna element (AE1-a) and a second antenna element (AE1-b) forming a pair of antenna elements (AE1-a,AE1-b), the first antenna element (AE1-a) comprises an antenna element port (S1a) connected to a first antenna (A1) and the second antenna element (AE1-b) comprises an antenna element port (T1b) connected to a second antenna (A2);
- and
- the step of creating said first beam and said second beam comprises:
- applying a first beam weight (Wb1,S1a) and a second beam weight (Wb2,S1a) to antenna element port S1a;
- and
- applying a third beam weight (Wb1,T1b) and a fourth beam weight (Wb2,T1b) to antenna element port T1b, wherein
- Wb2,S1a is a function of Wb1,T1b, and/or
- Wb2,T1b is a function of Wb1,S1a.
An antenna array apparatus, comprising:
- a first antenna element comprising a first antenna (A1) and an antenna element port (S1a) connected to the first antenna (A1);
- a second antenna element comprising a second antenna (A2) and an antenna element port (T1b) connected to the second antenna (A2);
- a first beam forming circuit configured to apply a first beam weight (Wb1,S1a) and a second beam weight (Wb2,S1a) to port S1a;
- and
- a second beam forming circuit configured to apply a third beam weight (Wb1,T1b) and a fourth beam weight (Wb2,T1b) to port T1b, wherein
- Wb2,S1a is a function of Wb1,T1b, and/or
- Wb2,T1b is a function of Wb1,S1a.
Dependencies are inferred from the claim text.