Vector Decomposition Using Outphasing Signals for Low-Power Remote Units
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Solution Overview
Problem
Existing optical radio transmission systems face challenges in reducing power consumption and complexity in remote units due to the need for analog-to-digital converters (ADC) and digital-to-analog converters (DAC) in signal transmission, which increase power consumption and complicate the remote unit configuration.
Innovation Solution
A vector decomposer is introduced that generates outphasing signals using phase rotation signals and combiners, eliminating the need for ADC and DAC in remote units by directly converting analog signals into outphasing signals, thereby simplifying the configuration and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ADC and DAC are used in remote units for signal conversion, then signal transmission quality is improved, but power consumption increases and device complexity increases
Solution Approach 1:
The patent extracts the ADC and DAC functions from the remote unit and relocates them to the base unit. The remote unit only performs analog signal processing using amplifiers and filters, while all digital conversions are centralized at the base unit. This extraction eliminates the complexity of having ADC/DAC in each remote unit while maintaining signal transmission quality through proper analog processing in the distributed units.
Solution Approach 2:
The patent introduces an intermediary analog processing stage in the remote unit that handles signal amplification and filtering before transmission. This intermediary analog processing allows the system to maintain signal quality without requiring direct digital conversion at the remote unit, effectively mediating between the analog distributed units and the digital base unit processing.
2Reliability
If ADC and DAC are used in remote units for signal conversion, then signal transmission quality is improved, but power consumption increases
Solution Approach 1:
The patent extracts the high-power ADC and DAC components from the remote units and concentrates them in the base unit. Since ADC and DAC are among the most power-consuming components in a communication system, removing them from the distributed remote units dramatically reduces overall system power consumption while maintaining signal transmission quality through centralized digital processing at the base unit.
Solution Approach 2:
The remote units perform self-service analog signal processing using low-power amplifiers and filters, handling the analog domain tasks locally without requiring high-power digital conversion components. This self-service approach in the analog domain allows the system to maintain transmission quality while avoiding the power consumption penalty of distributed ADC/DAC.
3Device complexity
If outphasing signals are generated using phase rotation and combiners, then device complexity is reduced, but signal transmission quality may be affected
Solution Approach 1:
The patent extracts the complex signal generation functions from the remote unit and implements them using a simplified outphasing architecture with phase rotators and combiners at the base unit. The remote unit only needs to perform simple analog amplification and combining, which maintains device complexity reduction while the base unit handles the sophisticated signal processing to ensure transmission quality.
Solution Approach 2:
The patent replaces complex digital signal processing mechanics with analog phase rotation and vector combining mechanics. By using phase rotators to generate quadrature components and combiners to synthesize the final signal, the system achieves simplified device architecture while maintaining signal transmission quality through proper analog signal processing principles.
Data Source
AI summary
A vector decomposer includes: a phase rotation signal generator configured to generate a first phase rotation signal and a second phase rotation signal each having a phase rotated through 90° in a positive direction and a negative direction with respect to an input signal; and a combiner configured to combine the input signal and the first phase rotation signal and generate a first outphasing signal, and combine the input signal and the second phase rotation signal and generate a second outphasing signal.