Multi-Allocation Precoding for Low-EVM Wireless Transmission
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Solution Overview
Problem
High error vector magnitude (EVM) values in wireless communications systems, particularly in high bandwidth and high power transmissions, lead to signal distortion and increased bit errors, which are exacerbated by factors like noise, interference, and hardware imperfections, especially in sub-terahertz frequency bands.
Innovation Solution
Implement multi-allocation precoding on modulated signals, allocating different, non-overlapping frequency portions of the signal to different antenna elements to improve power spectral density and reduce EVM, thereby enhancing transmission quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high bandwidth and high power transmissions are used, then data carrying capacity and transmission distance are improved, but error vector magnitude increases leading to signal distortion and increased bit errors
Solution Approach 1:
The patent segments the transmitted signal into multiple subcarriers and applies different precoding matrices to different subsets of these subcarriers. This segmentation allows the system to maintain high bandwidth utilization while reducing EVM by treating different frequency portions independently with optimized precoding, thereby resolving the contradiction between high data capacity and signal accuracy.
2Power
If traditional precoding is used, then transmission simplicity is maintained, but power spectral density is insufficient and EVM remains high
Solution Approach 1:
The patent applies different precoding matrices to different subsets of subcarriers, creating local quality variations across the frequency spectrum. This allows each subcarrier subset to be optimized for its specific channel conditions, improving power spectral density and reducing EVM locally, while the overall system complexity remains manageable through the structured approach of dividing subcarriers into subsets.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for wireless communication. A method performed by a user equipment (UE) includes receiving configuration information for receiving a first multi-allocation precoding transmission from a network entity; receiving, from the network entity, the first multi-allocation precoding transmission including a first plurality of differently precoded signals corresponding to a first modulated signal, wherein each differently precoded signal of the first plurality of differently precoded signals corresponds to a respective different portion of a first modulated signal, and a different antenna element of a first plurality of antenna elements of the network entity; combining the first plurality of differently precoded signals to obtain the first modulated signal; and demodulating the first modulated signal.