Multi-Antenna Transmission Power Imbalance Cancellation
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Solution Overview
Problem
In distributed antenna systems, the existing precoding matrices do not effectively address power imbalances between geographically separated transmission points, leading to interference and reduced system throughput.
Innovation Solution
A multi-antenna transmission method and apparatus that involves receiving and processing reference signal configurations to acquire channel state information (CSI) for each configuration, allowing for CSI feedback and separate processing of signals from different transmission points to mitigate power imbalances and improve throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single precoding matrix is used for multiple geographically separated transmission points, then the system structure is simplified, but power imbalance and interference cannot be effectively canceled, resulting in degraded system throughput
Solution Approach 1:
The patent divides the precoding operation into separate processing for each transmission point. Instead of using a single precoding matrix for multiple TPs, the system obtains separate channel state information (CSI) for each TP and applies separate precoding matrices. This segmentation allows each TP to be processed independently, enabling effective interference cancellation while maintaining manageable system complexity through modular processing.
Solution Approach 2:
The patent applies different precoding strategies to different transmission points based on their individual channel characteristics. Each TP receives dedicated CSI feedback and uses locally optimized precoding matrices tailored to its specific channel conditions. This local quality approach allows the system to adapt to power imbalances and interference patterns specific to each TP, thereby improving overall system throughput.
2Object-affected harmful factors
If channel state information is obtained for multiple transmission points with different received powers, then interference cancellation is improved, but the system complexity increases due to separate processing requirements
Solution Approach 1:
The patent performs preliminary actions by obtaining channel state information (CSI) feedback from the user equipment for each transmission point before the actual data transmission. This preliminary CSI acquisition enables the system to pre-calculate appropriate precoding matrices for each TP, allowing interference cancellation to be built into the transmission process itself rather than requiring complex post-processing.
Solution Approach 2:
The patent implements a feedback mechanism where the user equipment measures channel state information for multiple transmission points and feeds this information back to the base station. This feedback loop enables the system to adapt the precoding matrices based on actual channel conditions, including power imbalances and interference patterns, thereby effectively canceling interference while managing processing complexity through iterative optimization.
Data Source
AI summary
The present invention relates to the field of communications technologies and provides a multi-antenna transmission method and apparatus, which can reduce interference and improve system throughput. In the solutions provided in embodiments of the present invention, a reference signal RS configuration set sent by an eNB is received, CSI corresponding to each RS configuration in the RS configuration set is acquired based on the RS configuration set, the CSI set is sent to the eNB, then a signal sent by the eNB according to the CSI set is received, and data processing is performed. The solutions provided in the embodiments of the present invention apply to multi-antenna signal transmission.