OAM Precoding Method for Non-Aligned UCA Inter-Mode Interference
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Solution Overview
Problem
In UCA-based OAM communication systems, non-aligned transmitting and receiving ends lead to inter-mode interference and received signal energy loss, which existing precoding methods fail to adequately address.
Innovation Solution
A precoding method that involves sending a reference signal for channel estimation, receiving precoding information including mode combination indices, PMI, or mode numbers, determining transmission mode information and precoding weight vectors, and indicating this information to the receiving end, thereby optimizing beam steering and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional precoding methods using principal eigenvector and Hadamard matrix are used, then the system can operate with existing codebook designs, but inter-mode interference and received signal energy loss occur in non-aligned scenarios
Solution Approach 1:
The patent changes the parameter representation from traditional azimuth-elevation angles to orbital angular momentum mode numbers. By quantizing the departure angle parameters and mapping them to OAM mode combinations, the system adapts the codebook structure to better suit non-aligned scenarios, reducing inter-mode interference while maintaining compatibility with existing precoding frameworks
Solution Approach 2:
The patent introduces dynamic mode number indication where the maximum OAM mode number is adjusted based on channel conditions and quantization precision requirements. This dynamic adaptation allows the system to optimize between feedback overhead and quantization accuracy, improving signal quality in varying non-aligned scenarios
2Measurement precision
If high-precision quantization of azimuth and depression angles is performed, then beam steering accuracy improves, but feedback overhead increases
Solution Approach 1:
The patent transforms the continuous angle parameters (azimuth and depression) into discrete mode number parameters through quantization. This parameter transformation reduces the feedback dimensionality while maintaining beam steering accuracy, as the mode numbers directly correspond to OAM modes that naturally handle non-aligned scenarios
Solution Approach 2:
The patent implements adaptive quantization where the maximum mode number is selected based on the required precision level. For scenarios requiring higher precision, larger mode numbers are used, while for less demanding scenarios, smaller mode numbers suffice, thus optimizing the balance between accuracy and feedback overhead
Data Source
AI summary
The present disclosure relates to the technical field of communications, and provides a precoding method and device/storage medium/apparatus. The method comprises: transmitting a reference signal for channel estimation to a receiving end; receiving precoding information sent by the receiving end, the precoding information comprising at least one of at least one modality combination index, a precoding matrix indicator (PMI), and the number of modalities, and the number of modalities being used for indicating the maximum number of orbital angular momentum (OAM) modalities that can be transmitted under the current channel condition; determining transmission modality information on the basis of the precoding information and transmitting a precoding weight vector; and indicating the transmission modality information to the receiving end.