Antenna Selection Signal for Phase Difference Adjustment
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Solution Overview
Problem
Existing wireless communication systems with multiple antenna elements often rely on selecting only one antenna for transmission, limiting the optimization of phase differences between antennas, which can impact signal quality and spectral efficiency.
Innovation Solution
The use of an antenna selection signal in the context of antenna switched transmit diversity (ASTD) protocol to calculate and adjust the phase difference between antennas, modifying pre-transmission signals based on feedback from a receiving device to optimize signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If only one antenna is selected for transmission at any one time, then device complexity is reduced and ease of operation is improved, but signal quality and spectral efficiency deteriorate due to limited phase difference optimization
Solution Approach 1:
The system dynamically adjusts the phase difference between antennas based on feedback from the receiver. The mobile transmitter can change phase differences in response to received feedback signals, allowing the system to adapt to varying channel conditions and optimize signal quality without requiring complex manual configuration.
Solution Approach 2:
The invention changes the phase difference parameter between antennas to optimize transmission. By adjusting the phase relationship between signals from different antennas and using complex weighting calculations, the system improves signal quality and spectral efficiency while maintaining operational simplicity.
2Device complexity
If only one antenna is selected for transmission at any one time, then device complexity is reduced, but spectral efficiency deteriorates due to inability to optimize phase differences between multiple antennas
Solution Approach 1:
The system uses multiple antennas that can function both individually and in combination. The same antenna elements used for simple selection diversity can also be used for phase difference adjustment and beamforming, making the hardware universal and avoiding additional complexity while improving spectral efficiency.
Solution Approach 2:
The receiver provides feedback to the mobile transmitter about channel conditions and signal quality. This feedback enables the transmitter to calculate appropriate phase differences and complex weights, optimizing spectral efficiency without requiring the transmitter to have complex channel state information or perform complex computations independently.
3Reliability
If complex weighting is calculated and phase difference is adjusted between multiple antennas, then signal quality and spectral efficiency are improved, but device complexity increases
Solution Approach 1:
The feedback channel acts as an intermediary that carries channel quality information from the receiver to the transmitter. This intermediary mechanism allows the simple receiver to guide the complex transmitter, enabling phase difference adjustment without requiring complex bidirectional communication or sophisticated signal processing at the receiver end.
Solution Approach 2:
The mobile transmitter performs self-adjustment of phase differences based on feedback from the receiver. The system uses its own transmitted signals and the received feedback to automatically calculate and apply the appropriate phase weighting, eliminating the need for external complex control systems or manual configuration.
Data Source
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AI summary
A method and apparatus for using an antenna selection signal for selecting a transmit diversity parameter, including phase difference and/or power ratio between concurrently transmitting antennas.