Antenna Power Balancing via Phase Rotation in Base Stations
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Solution Overview
Problem
In radio communications, particularly in WCDMA systems with MIMO and HSDPA, power imbalance between antennas hampers the performance of HSDPA, and existing methods using orthogonal virtual antenna mapping fail to enhance performance by introducing phase differences between antenna signals.
Innovation Solution
A method and apparatus that multiply virtual antenna signals by an orthogonal matrix and apply a rotary phase to create phase differences between physical antenna signals, ensuring power balance and fluctuating performance of HSDPA.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signals are multiplied by orthogonal VAM matrix to balance power between antennas, then power balance is achieved, but HSDPA performance cannot be enhanced
Solution Approach 1:
The patent applies phase rotation to the intermediate regulative signals obtained from VAM matrix multiplication. By rotating the phase of these signals before final antenna output, the system maintains power balance while introducing phase differences that enable HSDPA performance enhancement through diversity gain and throughput improvement
Solution Approach 2:
The patent separates the signal processing into distinct stages: first multiplying virtual antenna signals by the orthogonal VAM matrix to achieve power balance, then rotating the phase of the resulting intermediate regulative signals. This segmentation allows each processing stage to independently optimize its function without interfering with the other
2Productivity
If phase rotation is applied to intermediate regulative signals, then HSDPA performance is enhanced, but system complexity increases
Solution Approach 1:
The patent introduces intermediate regulative signals as a mediator between the VAM matrix multiplication stage and the final antenna output stage. These intermediate signals serve as the target for phase rotation, allowing performance enhancement without directly modifying the orthogonal VAM matrix structure or the final antenna signal combination
Data Source
AI summary
A method and an apparatus for balancing power between antennas, and a base station are provided. The method includes multiplying n virtual antenna signals by an orthogonal matrix to obtain n intermediate regulative signals; and using a corresponding rotary phase to rotate phases of m of the n intermediate regulative signals, so that a phase difference exists between at least two of n physical antenna signals output by antennas.