Multicarrier Transmitter Power Normalization for Nonlinear Distortion
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Solution Overview
Problem
Conventional multicarrier communication systems face challenges with non-uniform power loading among antennas, leading to increased nonlinear distortion due to beamforming coefficients affecting power amplifiers, particularly in multicarrier transmitters like OFDM systems.
Innovation Solution
The normalization of beamforming matrices based on average subcarrier power loading is applied to reduce non-uniform power loading among antennas, using a normalizer to generate normalized beamforming matrices that are then applied to symbol-modulated subcarriers, thereby minimizing power amplifier nonlinear distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming coefficients are applied to compensate for channel conditions, then communication performance is improved, but non-uniform power loading among antennas increases leading to increased nonlinear distortion
Solution Approach 1:
The patent applies parameter changes by normalizing the beamforming coefficients (weights) so that the power loading on each antenna is uniformly distributed. This involves calculating the average power across all antennas and adjusting the beamforming weights accordingly, transforming the power distribution from non-uniform to uniform, thereby reducing nonlinear distortion in the power amplifiers while maintaining communication performance.
2Reliability
If beamforming coefficients are applied to compensate for channel conditions, then communication performance is improved, but power amplifier efficiency decreases due to non-uniform power loading
Solution Approach 1:
The patent changes the parameters of the beamforming coefficients by normalizing them to achieve uniform power loading across all antennas. This parameter adjustment ensures that each power amplifier operates at similar power levels, improving overall power amplifier efficiency and reducing energy loss while preserving the communication performance benefits of beamforming.
Data Source
AI summary
In a multi-antenna, multicarrier transmitter, a multicarrier communication signal is generated by normalizing beamforming matrices based on an average subcarrier power loading for each of the transmit antennas. One or more spatial streams may be transmitted by two or more antennas.