Wavefront-Multiplexed Multi-Channel Amplifiers for Flexible RF Power Sharing
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Solution Overview
Problem
Existing satellite communication systems face limitations in flexibility and efficiency due to the use of in-phase power combiners, which only function at specific frequencies, and struggle with RF power sharing among downlink spot beams with varying traffic patterns, leading to suboptimal power amplification and distribution.
Innovation Solution
The implementation of Orthogonal Wave-Front Diversity Multiplexing (OWFDM) techniques, which dynamically multiplex and demultiplex signals across a bank of parallel power amplifiers, allowing for concurrent amplification of multiple independent signals with unique phase distributions, enabling flexible power sharing and combining capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If in-phase power combiners are used to coherently combine multiple amplifiers, then power output is enhanced, but frequency flexibility is limited
Solution Approach 1:
The patent implements dynamic signal routing and phase adjustment mechanisms that allow the system to adapt to different frequency configurations. The signal distribution network dynamically reconfigures phase relationships based on operating frequency, enabling the same amplifier bank to operate across multiple frequency bands without requiring fixed-frequency combiners.
Solution Approach 2:
The system changes phase and routing parameters dynamically based on frequency input. By adjusting phase shift amounts and signal path selections according to the operating frequency, the system maintains coherent combining capability across different frequency bands, resolving the contradiction between power output and frequency flexibility.
2Power
If dedicated power amplifiers are assigned to each downlink spot beam, then power amplification is sufficient, but power sharing efficiency decreases
Solution Approach 1:
The patent creates a universal power amplifier pool that serves multiple downlink spot beams simultaneously. The signal distribution network routes amplifier outputs dynamically based on traffic demands, allowing the same set of amplifiers to serve different beams at different times. This multi-functional approach eliminates dedicated amplifier requirements while maintaining sufficient power amplification for each beam.
Solution Approach 2:
The system dynamically adjusts signal routing and power distribution based on real-time traffic patterns across different spot beams. When traffic demand varies among beams, the system reallocates amplifier resources dynamically, directing more amplifier output to high-traffic beams and reducing allocation to low-traffic beams, thereby maximizing power sharing efficiency while maintaining adequate amplification where needed.
3Adaptability or versatility
If traffic patterns among downlink spot beams vary significantly, then service flexibility is improved, but power distribution optimization becomes difficult
Solution Approach 1:
The patent implements feedback mechanisms that continuously monitor traffic patterns across downlink spot beams and use this information to optimize power distribution. The system receives feedback on signal quality, power levels, and traffic demands, then dynamically adjusts amplifier allocation and power distribution parameters to maintain optimal performance despite varying traffic patterns, resolving the difficulty of optimization under flexible service conditions.
Data Source
AI summary
A power amplification system comprises a pre-processor including a wavefront multiplexer, a set of power amplifiers, and a post-processor including a wavefront demultiplexer. The wavefront multiplexer receives concurrently N input signals, N being an integer greater than 2, performs a wavefront multiplexing transform on the N input signals by attaching N wavefronts to the N input signals respectively, and generates N first output signals. The N wavefronts are unique and mutually orthogonal. The wavefront multiplexing transform has an inverse. The N power amplifiers amplify the N first output signals and generate N amplified signals. The wavefront demultiplexer performs the inverse of the wavefront multiplexing transform on the N amplified signals and generates N second output signals, the N second output signals corresponding respectively to the N input signals. Each of the N second output signals is an amplified version of a corresponding one of the N input signals.