Beamforming Power Amplifier Control for Scan-Angle Efficiency
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Solution Overview
Problem
Beamforming transmission systems face inefficiencies due to increased scanning losses at extreme angles, leading to reduced Effective Isotropic Radiated Power (EIRP) and signal-to-noise ratio (SNR), as they operate at high power levels even when not necessary, resulting in poor power efficiency at lower angles.
Innovation Solution
A beamforming transmission system with adaptive closed-loop control that adjusts the output power of power amplifiers based on desired beam scanning angles and current output power levels, utilizing multiple operating points with distinct supply voltage and current settings to optimize power efficiency, allowing for independent control of supply voltage and bias current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming elements are operated at high/maximum power to compensate for increased scanning loss at extreme angles, then the signal-to-noise ratio (SNR) is maintained, but power efficiency deteriorates when scanning at lower angles
Solution Approach 1:
The system dynamically adjusts the output power of beamforming elements based on the desired beam scanning angle. The power controller receives angle information and automatically selects appropriate power levels, transitioning from static high-power operation to dynamic adaptive power control, thereby improving power efficiency while maintaining SNR when needed
Solution Approach 2:
The system changes the operating power parameter of beamforming elements according to the scanning angle. At angles below 50 degrees, lower power is used; at extreme angles above 50 degrees, higher power is applied to compensate for scanning loss. This parameter adaptation resolves the contradiction between maintaining SNR and improving power efficiency
2Power
If beamforming elements operate at high power to maximize output, then the Effective Isotropic Radiated Power (EIRP) is increased, but power consumption increases unnecessarily at lower scanning angles
Solution Approach 1:
The system adapts the output power parameter based on the scanning angle. The power controller adjusts the power level dynamically, using high power only when necessary for extreme angles to maintain EIRP, and reducing power for smaller angles to eliminate unnecessary energy consumption
Solution Approach 2:
Instead of always operating at maximum power, the system applies partial power action appropriate to the scanning conditions. High power is applied only partially when needed for extreme angles, while lower power suffices for smaller angles, avoiding excessive energy consumption
Data Source
AI summary
A beamforming transmission system and a method of controlling an output power of a beamforming transmission system are disclosed, the system comprising one or more transmission elements, the one or more transmission elements each comprising a power amplifier; an antenna coupled to the power amplifier; and a power detector coupled to the antenna; a power controller coupled to the power amplifier; a system processing module coupled to the one or more transmission elements, the system processing module further coupled to the power controller, the system processing module being arranged to instruct the power controller to control an output power of the power amplifier; wherein the system processing module is arranged to determine a desired beam scanning angle of the one or more transmission elements and to obtain a present output power of the power amplifier from the power detector; and further wherein the system processing module is arranged to instruct the power controller to control the output power of the power amplifier based on both the desired beam scanning angle and the present output power of the power amplifier.