Channel Reconstruction in 3D MIMO Using Partial Antenna Port Reference Signals
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately measuring and reconstructing MIMO channels in 3D multi-input multi-output (MIMO) systems, particularly in supporting high-speed data traffic and low latency requirements with efficient energy use.
Innovation Solution
The method involves using a specific interval-based transmission of reference signals across antenna ports in a 2D antenna port array, with the option to shift locations and update channel covariance matrices, and receiving the size and configuration from the eNB, to improve channel reconstruction performance in 3D MIMO systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are transmitted from all antenna ports in a 2D antenna port array, then channel measurement accuracy is improved, but reference signal overhead and resource consumption increase
Solution Approach 1:
The patent segments the 2D antenna port array into multiple groups, where only selected antenna ports from each group transmit reference signals. This segmentation allows the system to maintain adequate channel measurement accuracy while reducing the total number of reference signals transmitted, thereby resolving the contradiction between measurement precision and resource overhead.
Solution Approach 2:
The patent implements partial action by transmitting reference signals from only a subset of antenna ports rather than all ports. The selection criteria and spacing patterns are designed to provide sufficient channel information for accurate measurement while significantly reducing the quantity of reference signals required, thus balancing measurement accuracy with resource efficiency.
2Measurement precision
If antenna ports are spaced closer together, then spatial resolution is improved, but reference signal interference increases
Solution Approach 1:
The patent applies different spacing patterns to different regions of the antenna port array. By optimizing the local spacing configuration in specific areas, the system achieves good spatial resolution where needed while maintaining adequate spacing in other areas to minimize interference, thus resolving the contradiction between spatial resolution and interference.
Solution Approach 2:
The patent employs periodic spacing patterns for selected antenna ports, creating regular intervals that optimize both spatial resolution and interference characteristics. This periodic arrangement allows the system to achieve consistent spatial sampling while maintaining predictable interference patterns that can be managed through signal processing.
3Measurement precision
If more antenna ports are used for reference signal transmission, then channel reconstruction accuracy is improved, but system complexity increases
Solution Approach 1:
The patent segments the antenna port array and selects representative ports from each segment for reference signal transmission. This approach maintains channel reconstruction accuracy by ensuring adequate spatial sampling across the entire array while reducing the total number of active ports, thereby lowering system complexity in terms of signal processing and resource management.
Solution Approach 2:
The patent uses a structured selection pattern where antenna ports are chosen based on predetermined spacing rules. This systematic copying approach allows the system to achieve good channel reconstruction accuracy through representative sampling without requiring all ports to be actively transmitted, thus reducing the operational complexity of the system.
Data Source
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AI summary
A channel measurement method in a wireless communication system and an apparatus therefor are disclosed. Specifically, a method for measuring a channel by a terminal in the wireless communication system may comprise the steps of: receiving, from a base station, a reference signal on part of antenna ports within a two-dimensional antenna port array; measuring channels for the part of antenna ports on the basis of the reference signal received from the base station; and reconstructing a channel for an antenna port which is not used for transmission of the reference signal within the two-dimensional antenna port array, using the channel measurement result, to reconstruct channels for all antenna ports within the two-dimensional antenna port array.