Antenna Precoder Selection With Coupled Antennas
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Solution Overview
Problem
Current antenna precoder selection methods in wireless communication systems do not account for antenna coupling, leading to variations in transmit power across different precoders, which can result in suboptimal performance and incorrect channel quality estimates.
Innovation Solution
The method involves estimating a power metric for each precoder, scaling the transmission channel based on this metric, and generating a channel quality metric to select the optimal precoder, ensuring equal energy transmission and accurate channel quality estimation by applying precoder-dependent scaling factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If precoding matrices are applied to achieve equal energy antenna patterns, then the antenna patterns have equal energy, but the precoding matrix-based channel estimates will have scaling error
Solution Approach 1:
The patent applies parameter changes by introducing precoder-dependent scaling factors that adjust the channel estimates based on the specific precoding matrix used. This allows the system to maintain equal energy antenna patterns while compensating for the scaling errors in channel estimates through mathematical transformation of the estimation parameters.
Solution Approach 2:
The patent introduces an intermediary scaling factor that mediates between the equal energy requirement and the channel estimation accuracy. This scaling factor acts as a correction term that reconciles the contradiction by adjusting the channel estimate to account for the energy variations introduced by different precoding matrices.
2Measurement precision
If precoding matrices are applied to ensure correct channel estimation, then the channel estimation is accurate, but the resulting antenna patterns will not have equal energy and precoding matrix selection will not be optimal
Solution Approach 1:
The patent changes the parameter space by introducing scaling factors that allow the system to evaluate precoding matrices based on corrected channel estimates rather than raw estimates. This enables optimal precoding matrix selection while maintaining accurate channel estimation through parameter transformation.
3Adaptability or versatility
If antenna patterns are not normalized, then the energy of the antenna pattern varies significantly for different precoding matrices, but this leads to incorrect channel gain estimates and wrong PMI-CQI pairs
Solution Approach 1:
The patent applies parameter changes by normalizing the antenna patterns through precoder-dependent scaling factors. This normalization process transforms the channel estimates to account for the varying energies of different precoding matrices, thereby maintaining accurate channel gain estimates while preserving the adaptability of the system to different precoding configurations.
4Use of energy by moving object
If an antenna array is used to focus radiated power and reduce transmit power, then the power needed to transmit data is reduced, but this creates interference for receivers not in the direction of the targeted receiver
Solution Approach 1:
The patent applies local quality by using precoding matrices to direct the transmitted signal specifically toward the intended receiver. This spatial filtering ensures that the energy focusing benefit is achieved locally for the target receiver while minimizing the harmful interference generated for other receivers in different directions.
Data Source
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AI summary
A method and apparatus optimize antenna precoder selection with coupled antennas. A data signal can be received (910). The data signal can be precoded (920). The precoded data signal can be scaled using a precoder-dependent scaling factor (940). The scaled precoded data signal can be transmitted through a plurality of antennas (960).