Precoded Antenna Domain Reference Signal Transmission
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Solution Overview
Problem
In wireless communication systems supporting multiple antennas, existing technologies face challenges in efficiently transmitting reference signals across precoded horizontal and vertical antenna domains, which affects channel estimation and data demodulation.
Innovation Solution
A method and apparatus for transmitting reference signals by precoding horizontal and vertical antenna domains, where the second reference signal is generated based on precoded vertical antenna domains, and both signals are used by the receiving end to restore entire channels through a Kronecker product, with downlink control information including information on the precoded domains and a bit index indicating the reference signal scheme.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are transmitted for all precoded antenna domains, then channel estimation accuracy is improved, but signaling overhead and system complexity increase
Solution Approach 1:
The patent segments the precoded antenna domains into two groups: horizontal antenna domains and vertical antenna domains. Instead of transmitting reference signals for all domains separately, the system transmits a first reference signal for horizontal domains and a second reference signal for vertical domains. This segmentation reduces the total number of reference signals needed while maintaining channel estimation accuracy through the use of Kronecker product to restore the complete channel matrix.
2Measurement precision
If reference signals are transmitted for all precoded antenna domains, then channel estimation accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent divides the antenna domains into horizontal and vertical segments, transmitting reference signals only for these two segments rather than for every individual precoded antenna domain. This reduces signaling overhead while the receiving end can reconstruct the complete channel information using the Kronecker product of the two reference signals, thus maintaining estimation accuracy without the full signaling burden.
Solution Approach 2:
The patent uses the concept of copying channel information through mathematical reconstruction. Instead of transmitting unique reference signals for each antenna domain, the system transmits reference signals for horizontal and vertical domains that can be copied and combined via Kronecker product to generate the complete set of channel estimates, reducing redundant signaling.
3Device complexity
If maximum 4 transmitting antennas are supported as in conventional LTE, then device complexity is reduced, but MIMO capacity and performance are limited
Solution Approach 1:
The patent extends the conventional 2D antenna array (horizontal only) by adding a vertical dimension, creating a 3D antenna system. This dimensional extension allows support for more transmitting antennas (beyond the conventional 4) while maintaining manageable device complexity through structured precoding and segmented reference signal transmission. The vertical antenna domains provide additional spatial degrees of freedom that increase MIMO capacity and performance.
Data Source
AI summary
The present invention relates to a method and device for transmitting a reference signal at a transmission end in a wireless communication system supporting multiple antennas. In particular, the present invention includes a step of transmitting a first reference signal related to pre-coded horizontal antenna domains and a second reference signal related to pre-coded vertical antenna domains to a reception end, wherein at least one of the pre-coded horizontal antenna domains is included in the vertical antenna domains.