Power Amplifier Adjustment for MIMO Beamforming
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Solution Overview
Problem
In wireless communication systems, especially those using MIMO technology, the existing methods for beamforming require frequent calibration exchanges to account for RF chain impairments, leading to inefficiencies due to gain/phase imbalances and coupling losses, which disrupt the ideal reciprocity between forward and reverse channels.
Innovation Solution
A method and apparatus that apply beamsteering matrices to signals for multiple antennas, determine signal energies, and adjust power amplifier output levels based on relative signal energies to optimize power distribution across antennas, thereby reducing the need for frequent calibration exchanges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent calibration exchanges are performed to account for RF chain impairments, then transmission reliability is improved, but system efficiency deteriorates due to increased overhead and disruption
Solution Approach 1:
The patent applies preliminary action by performing power amplifier adjustment based on beamsteering matrix characteristics before actual data transmission begins. The system calculates signal energies for each antenna path and pre-adjusts power amplifier output levels to compensate for gain/phase imbalances and coupling losses, eliminating the need for frequent calibration exchanges during operation.
2Productivity
If power amplifier output levels are adjusted based on relative signal energies, then beamforming efficiency is improved, but device complexity increases due to additional power control mechanisms
Solution Approach 1:
The patent implements feedback by using the beamsteering matrix characteristics and calculated signal energies to automatically adjust power amplifier output levels. The system continuously monitors the relative signal energies across multiple antenna paths and adjusts power amplifier gains accordingly, creating a closed-loop control mechanism that optimizes beamforming efficiency without requiring complex manual calibration procedures.
Data Source
AI summary
One or more beamsteering matrices are applied to one or more signals to be transmitted via multiple antennas. After the one or more beamsteering matrices are applied to the one or more signals, the plurality of signals is provided to a plurality of power amplifiers coupled to the multiple antennas. Signal energies are determined for the plurality of signals provided to the plurality of power amplifiers, and relative signal energies are determined based on the determined signal energies. Output power levels of the plurality of power amplifiers are adjusted based on the determined relative signal energies.