Circular Antenna Subarray Beamforming for Non-Integer OAM Links
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Solution Overview
Problem
Existing wireless communication systems face increased complexity in decoding signals due to differences in the quantity of antenna subarrays between transmitting and receiving devices, particularly when these quantities are not integer multiples, leading to inefficiencies in orbital angular momentum (OAM) multiplexing.
Innovation Solution
The described techniques enable communication between devices with non-integer multiple quantities of antenna subarrays by using a receiving device to perform channel estimation and transmit feedback messages to the transmitting device, allowing for the determination of beamforming weights based on the different quantities of antenna subarrays, which are then used for concurrent signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional integer multiple antenna subarray configurations are used, then the system maintains simple decoding processes, but it cannot support flexible OAM multiplexing between devices with different antenna quantities
Solution Approach 1:
The patent changes the fundamental parameter of antenna subarray quantity relationships from integer multiples to non-integer multiple configurations. This allows devices with different antenna quantities (e.g., 4 transmit subarrays and 3 receive subarrays) to communicate via OAM multiplexing while managing decoding complexity through standardized beamforming weight calculations and feedback mechanisms
2Productivity
If non-integer multiple antenna subarray configurations are used, then flexible OAM multiplexing is enabled, but aliasing and interference increase
Solution Approach 1:
The patent implements feedback mechanisms where receiving devices send channel state information and beamforming weight feedback to transmitting devices. This feedback loop enables the system to adjust and optimize beamforming weights specifically for non-integer multiple antenna configurations, thereby reducing aliasing and interference while maintaining high OAM multiplexing efficiency
Solution Approach 2:
The patent performs preliminary channel estimation and beamforming weight calculation before actual OAM signal transmission. By pre-determining the optimal beamforming weights based on the specific non-integer multiple antenna configuration, the system proactively mitigates potential aliasing and interference issues before they affect communication quality
3Reliability
If channel estimation and beamforming weight calculation are performed for non-integer multiple configurations, then communication reliability improves, but feedback message complexity increases
Solution Approach 1:
The patent extracts and separates the beamforming weight information from the general channel state information feedback. By identifying and extracting only the essential beamforming parameters needed for non-integer multiple configurations, the system reduces feedback message complexity while maintaining the reliability benefits of dedicated channel estimation and beamforming optimization
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. In some systems, a first device may include a first circular antenna array including a first quantity of antenna subarrays. A second device may include a second circular antenna array including a second quantity of antenna arrays. Each antenna subarray may include one or more antenna elements. The first device may transmit one or more reference signals to the second device. The second device may transmit a feedback message to the first device based on the reference signals. The feedback message may include an indication of sets of beamforming weights or information for determining the sets of beamforming weights based on the second quantity of antenna subarrays being different than the first quantity of antenna subarrays. The first device may transmit one or more signals concurrently to the second device based on the sets of beamforming weights.