Uplink Multi-Antenna Transmission via Port Group Distortion Mitigation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting uplink signals using multiple antennas due to inter-antenna port group distortion, which affects signal quality and synchronization.
Innovation Solution
A method for uplink multi-antenna transmission where a user equipment (UE) reports reference signal port grouping information and distortion vulnerability level (DVL) to the base station (BS), allowing the BS to configure appropriate precoder configuration information, including partial precoders and phase correction information, to mitigate distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink multi-antenna transmission is implemented, then transmission capacity and signal quality are improved, but inter-antenna port group distortion occurs affecting synchronization
Solution Approach 1:
The patent divides the antenna ports into multiple port groups (first port group, second port group, etc.) based on their spatial locations. Each port group is processed independently with dedicated precoders, allowing the system to maintain multi-antenna transmission capacity while managing distortion effects within each segmented group. This segmentation enables the eNB to apply different precoding strategies to different spatial groups, resolving the contradiction between overall transmission capacity and synchronization reliability.
Solution Approach 2:
The patent applies different precoding configurations to different antenna port groups based on their specific distortion characteristics. Each port group receives tailored precoder selection and phase correction according to its local distortion vulnerability level, rather than applying a uniform precoding approach. This local quality approach allows the system to maintain high transmission capacity across all antennas while ensuring synchronization reliability in each specific port group by addressing its unique distortion characteristics.
2Device complexity
If precoder selection is performed without considering distortion vulnerability, then system complexity is reduced, but signal quality deteriorates
Solution Approach 1:
The patent introduces dynamic precoder selection where the eNB determines precoder configuration information based on real-time or near-real-time distortion vulnerability level reports from the UE. The system transitions from static, fixed precoder assignments to dynamic adaptation where precoders are selected and adjusted according to the current distortion conditions of each antenna port group. This dynamic approach allows the system to maintain signal quality by adapting to changing distortion characteristics while managing complexity through automated reporting and configuration mechanisms.
Solution Approach 2:
The patent changes the precoder configuration parameters dynamically based on the distortion vulnerability level. When the UE reports high distortion vulnerability for certain port groups, the eNB modifies the precoder selection parameters to apply more aggressive distortion compensation. The system adjusts parameters such as precoder index, phase rotation values, and timing adjustments according to the reported distortion characteristics. This parameter change approach enables the system to maintain signal quality across varying distortion conditions while providing flexibility in the precoder configuration process.
3Device complexity
If uniform precoding is applied to all antenna ports, then system simplicity is maintained, but distortion between port groups cannot be compensated
Solution Approach 1:
The patent segments the uniform precoding approach into group-specific precoding while maintaining overall system structure. Instead of applying a single uniform precoder to all antenna ports, the system divides ports into groups and applies dedicated precoders to each group. This segmented approach preserves the simplicity of precoding operations while enabling distortion compensation within each port group. The eNB can maintain a relatively simple precoding framework while achieving group-specific distortion management through the segmentation of antenna ports.
Solution Approach 2:
The patent introduces the eNB as an intermediary that mediates between the UE's antenna port groups and the precoding process. The eNB receives distortion vulnerability level reports from the UE, processes this information, and generates appropriate precoder configuration information. This intermediary role allows the system to maintain simplicity at the UE level while achieving sophisticated distortion compensation through the eNB's processing capability. The eNB acts as a mediator that translates distortion reports into actionable precoder configurations, enabling compensation without requiring complex processing at the UE.
Data Source
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AI summary
Disclosed in the present application is a method for transmitting, by a terminal, an uplink signal to a base station through a plurality of antenna ports in a wireless communication system. Specifically, the method comprises the steps of: transmitting, to the base station, uplink reference signals corresponding to the plurality of antenna ports and antenna port grouping information: receiving, from the base station, information on an uplink precoder, which is determined on the basis of the uplink reference signals and the antenna port group information; precoding the uplink signal using the information on the uplink precoder; and transmitting the precoded uplink signal to the base station, wherein the antenna port grouping information comprises information on antenna port groups comprising the plurality of antenna ports and information of the signal distortion level between the antenna port groups.