Precoder-Dependent Scaling for Antenna Channel Estimation
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Solution Overview
Problem
Current antenna precoder selection methods in 3GPP wireless communication protocols face issues with scaling errors due to unequal energy in antenna patterns, leading to suboptimal PMI-CQI pair selection and channel estimation errors, especially in closely spaced antenna arrays.
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 precoder with the largest quality, ensuring equal energy precoded channels and accurate channel quality estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If precoding matrices are applied to yield equal energy antenna patterns, then antenna pattern energy equality is improved, but channel estimation accuracy deteriorates due to scaling errors
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 that would otherwise occur in channel estimation, effectively changing the estimation parameters to account for the precoding application.
Solution Approach 2:
The patent introduces an intermediary scaling factor that mediates between the equal energy requirement and accurate channel estimation. This scaling factor acts as a correction term applied to the channel estimates, allowing the system to satisfy both the equal energy constraint and maintain estimation accuracy by compensating for the precoding-induced scaling effects.
2Measurement precision
If precoding matrices are applied to ensure correct channel estimation, then channel estimation accuracy is improved, but antenna pattern energy equality deteriorates leading to suboptimal PMI selection
Solution Approach 1:
The patent changes the parameters of the channel estimation process by applying precoder-dependent scaling factors that are specific to each precoding matrix. This allows the system to maintain correct channel estimation while the scaling factors implicitly account for the energy variations in antenna patterns, enabling accurate PMI selection without sacrificing energy equality.
Solution Approach 2:
The patent implements feedback by using the known precoding matrices to compute appropriate scaling factors that are then applied to the channel estimates. This feedback mechanism ensures that the channel estimation accurately reflects the actual transmitted signal characteristics, allowing the receiver to correctly evaluate different PMI options based on the true channel conditions.
3Use of energy by moving object
If antenna arrays are used to focus radiated power and reduce transmit power, then power efficiency is improved, but interference to non-targeted receivers increases due to directional focusing
Solution Approach 1:
The patent applies local quality by using precoding matrices to direct signal energy specifically toward the intended receiver while maintaining different energy characteristics in different spatial directions. The precoders create localized high-energy beams to the target while the scaling factors ensure that the overall power distribution maintains appropriate levels for non-targeted directions, thus improving power efficiency while controlling interference through spatially selective energy distribution.
Data Source
AI summary
A scaled precoded data signal can be received. The scaled precoded data signal can be based on a precoder-dependent scaling factor. The scaled precoded data signal can be scaled by using a precoder dependent scaling factor that is dependent on a precoder used to precode the data signal. The scaled precoded data signal can be demodulated.