Microwave Transmitter Power Control for Buffer-Aware PA Output
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Solution Overview
Problem
Microwave radio links face issues with high power consumption and radio interference, leading to increased operational and capital expenditures, as well as interference with neighboring communication systems, which affects the total cost of ownership and performance.
Innovation Solution
A microwave transceiver with an adaptive coding and modulation (ACM) module, a power amplifier, and a control module that adjusts output power based on buffer state and priority levels, reducing power consumption and spectral efficiency to minimize interference and extend component lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power amplifier operates at high output power to ensure data transmission, then data transmission reliability is improved, but power consumption increases and radio interference is generated
Solution Approach 1:
The patent implements dynamic power adjustment by continuously monitoring buffer state and adapting the power amplifier's output power accordingly. The system transitions from static high-power operation to dynamic power levels that match actual transmission needs, resolving the contradiction between maintaining reliability and reducing power consumption.
Solution Approach 2:
The system changes the operating parameter (output power) of the power amplifier based on buffer state conditions. By adjusting the power parameter dynamically rather than maintaining a fixed high power level, the system achieves both reliable transmission when needed and energy efficiency when the buffer is empty or low.
2Reliability
If the power amplifier operates at high output power to maintain transmission quality, then data transmission quality is improved, but radio interference to neighboring systems increases
Solution Approach 1:
The system dynamically adjusts the transmitted power level based on actual data availability and priority, preventing continuous high-power transmission that causes interference. When the buffer is empty or contains only low-priority data, the transmitted power is reduced to minimal necessary levels, thereby reducing radio interference to neighboring communication systems.
Solution Approach 2:
The output power parameter of the power amplifier is changed according to buffer state and data priority. This parameter adjustment ensures transmission quality is maintained when necessary while reducing power-related harmful effects (radio interference) during periods of low or non-critical data transmission.
3Reliability
If continuous high power transmission is used to prevent buffer overflow, then buffer overflow risk is reduced, but operational expenditures increase
Solution Approach 1:
The system changes the power transmission parameter based on buffer fill level and data priority rather than maintaining continuous high power. This prevents buffer overflow by adjusting power to match actual transmission needs, avoiding the energy waste of transmitting at high power when the buffer is empty or contains non-critical data.
Solution Approach 2:
The system monitors its own buffer state and autonomously adjusts the power amplifier output accordingly. This self-regulating mechanism ensures buffer overflow prevention while minimizing energy consumption by only transmitting at high power when the buffer actually contains data that needs to be sent.
4Speed
If the power amplifier operates continuously at high power, then transmission speed is maintained, but component lifespan decreases
Solution Approach 1:
The power amplifier operates dynamically rather than continuously at fixed high power. The system adjusts power levels based on buffer state, transmitting at high power only when data is available and priority requires it, and reducing or stopping transmission when the buffer is empty. This dynamic operation reduces thermal stress and extends component lifespan while maintaining transmission speed when needed.
Solution Approach 2:
The operating power parameter of the power amplifier is changed according to buffer conditions and data priority. By varying the power parameter rather than maintaining constant high power, the system preserves transmission speed capability when necessary while reducing wear and extending the duration of component action through periods of lower or zero power operation.
Data Source
AI summary
A microwave transceiver comprising a data buffer, an ACM module, a PA, and an antenna. The ACM module configured to receive buffered data from the data buffer and to modulate the buffered data at a modulation format having a spectral efficiency, the PA configured to receive modulated buffered data from the ACM module, and to transmit amplified modulated buffered data, via the antenna, to a remote microwave transceiver at an output power. The modulation format is selected from a plurality of modulation formats based on a feedback signal from the remote microwave transceiver. The microwave transceiver further comprising a control module configured to monitor a buffer state of the data buffer, and to control the output power of the PA based on the buffer state.