Crossbar Phase Shifter for Multi-Antenna Beamforming Precision
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Solution Overview
Problem
Existing RF communication systems face challenges in efficiently managing phase shifting and beamforming for advanced cellular technologies like LTE-Advanced and 5G NR, particularly in handling multiple carriers and antennas with varying frequencies and power levels, which can lead to complexity and reduced performance.
Innovation Solution
A crossbar switch is integrated with a buffer and switch function to provide coarse and fine phase shifting, coupled with a plurality of signal conditioning circuits, to manage phase shifting and beamforming in RF communication systems, using both coarse and fine control signals for enhanced flexibility and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional phase shifting methods are used in RF communication systems with multiple carriers and antennas, then the system can handle basic phase adjustment, but the complexity increases and precision decreases when managing multiple frequencies and power levels
Solution Approach 1:
The phase shifting function is segmented into two independent parts: a crossbar switch for coarse phase shifting (0°, 90°, 180°, 270°) and a phase shifter for fine phase shifting. This segmentation allows each component to specialize in a specific phase adjustment range, achieving high overall precision while keeping individual components simple and manageable.
Solution Approach 2:
The patent introduces a two-dimensional phase shifting approach: the crossbar switch provides discrete phase shifts along one dimension (0°, 90°, 180°, 270°), while the phase shifter provides continuous fine adjustment along another dimension. This dimensional separation enables comprehensive phase control without requiring a single complex device.
2Adaptability or versatility
If multiple signal conditioning circuits are used to handle multiple carriers and antennas, then the system can provide comprehensive signal processing, but the device complexity and management difficulty increase
Solution Approach 1:
The crossbar switch is designed as a universal routing component that can connect any input signal conditioning circuit to any output antenna. This multi-functional switch handles coarse phase shifting, signal routing, and power level management across multiple carriers and antennas, reducing the need for separate dedicated circuits for each function.
Solution Approach 2:
The system employs dynamic control where the crossbar switch can be reconfigured in real-time to connect different signal conditioning circuits to different antennas based on current communication requirements. This dynamic routing capability allows the system to adapt to varying signal conditions, power levels, and carrier frequencies without requiring fixed dedicated circuit paths.
Data Source
AI summary
Crossbar switches for coarse phase shifting are disclosed. In certain embodiments, a mobile device includes an antenna array including a plurality of antennas. The mobile device further includes a front end system coupled to the antenna array and including a plurality of signal conditioning circuits each including a phase shifter. The plurality of signal conditioning circuits each provide phase shifting to a respective one of a plurality of radio frequency signals based on a fine control signal. The front end system further includes a crossbar switch coupled to the plurality of signal conditioning circuits and configured to provide phase shifting to the plurality of radio frequency signals based on a coarse control signal.