DM-RS Precoder Mapping for Multi-Antenna Channel Accuracy
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently transmitting demodulation-reference signal (DM-RS) based downlink data signals in multi-antenna systems, particularly due to inaccurate channel feedback and channel variation, which affect the precision of precoding and diversity gain.
Innovation Solution
A method and device for receiving DM-RS based downlink data signals in a multi-antenna wireless communication system, where a user equipment (UE) receives linear combination coefficients from a base station to apply to DM-RS antenna ports, enabling efficient mapping of downlink data signals to reference and secondary DM-RS ports, thereby improving channel correlation and diversity gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional precoding methods are used in multi-antenna systems, then device complexity is reduced, but channel feedback accuracy and diversity gain deteriorate
Solution Approach 1:
The patent segments the precoding process into two distinct stages: first, the base station performs channel estimation and determines optimal precoding matrices based on channel state information; second, the UE applies receive beamforming using separate beamforming matrices. This segmentation allows complex precoding operations to be distributed, improving channel feedback accuracy through dedicated estimation procedures while managing overall system complexity through division of labor between base station and UE.
Solution Approach 2:
The patent implements preliminary channel estimation and precoding matrix determination at the base station before data transmission. The base station performs channel state information acquisition and precoding matrix selection in advance, then communicates these parameters to the UE. This preliminary action enables more accurate channel feedback by preparing reference data and configuration parameters before the actual data transmission occurs, allowing the UE to apply pre-optimized beamforming.
2Reliability
If simple antenna mapping is used, then device complexity is reduced, but diversity gain deteriorates
Solution Approach 1:
The patent extends the antenna mapping from simple spatial distribution to multi-dimensional beamforming by introducing separate receive beamforming matrices for different antenna ports. Instead of merely mapping data streams to antennas, the system creates multiple receive beams in different spatial dimensions, each with its own beamforming matrix. This dimensional extension provides diversity gain by capturing signals from multiple spatial paths while managing complexity through structured matrix operations.
Solution Approach 2:
The patent changes the mapping parameters by introducing distinct beamforming matrices (W1, W2, W3) for different antenna ports and data streams. Rather than using a single uniform mapping, the system adjusts beamforming parameters independently for each port, allowing optimization of diversity gain for specific channel conditions. This parameter differentiation enables adaptive diversity exploitation while controlling complexity through parameterized matrix structures.
Data Source
AI summary
The present application proposes a method for receiving a demodulation-reference signal (DM-RS)-based downlink data signal from a base station by a terminal in a multiple-antenna-based wireless communication system. Specifically, the method comprises the steps of: receiving information relating to a linear coupling coefficient of a DM-RS antenna port from the base station; and receiving, from the base station, the downlink data signal to which a precoder for mapping the signal to a reference DM-RS antenna port and at least one auxiliary DM-RS antenna port among a plurality of DM-RS antenna ports is applied, wherein the precoder is to map the downlink data signal to the reference DM-RS antenna port and map the downlink data signal to the at least one auxiliary DM-RS antenna port by applying the linear coupling coefficient.