Uplink MIMO Precoding and DMRS Mapping for Link Reliability
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Solution Overview
Problem
Current wireless communication systems face challenges in managing increasing mobile traffic, particularly in distributing network load and ensuring reliable communication, especially with limited battery capacity and the need for efficient data transmission in D2D communication scenarios.
Innovation Solution
The implementation of the MIMO technique in uplink communication, specifically through the method of mapping demodulation reference signals (DMRS) to OFDM symbols and applying predetermined precodings, which can be changed according to OFDM symbol indexes, to enhance signal transmission and reception performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MIMO technique is applied to D2D communication, then link reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the D2D communication process by introducing separate DMRS mapping patterns for different antenna ports. Each antenna port has its own reference signal mapping, allowing independent channel estimation and improving link reliability through diversity while keeping the implementation modular and manageable
Solution Approach 2:
The patent extends single-antenna communication to multi-antenna MIMO by adding the spatial dimension. Multiple antenna ports transmit simultaneous data streams, and the system uses multiple DMRS ports to estimate channels for each spatial layer, achieving reliability improvement through spatial diversity and multiplexing
2Measurement precision
If demodulation reference signals are assigned for multiple antenna ports, then reception performance is improved, but resource overhead increases
Solution Approach 1:
The patent applies local quality by assigning DMRS resources specifically where needed - at the beginning of each transport block and at interval points. This localized reference signal placement provides accurate channel estimation exactly where data demodulation is required, without wasting resources across the entire transmission
Solution Approach 2:
The patent implements periodic DMRS mapping where reference signals are placed at regular intervals within each transport block. This periodic structure ensures that channel conditions are sampled frequently enough to track variations while maintaining a predictable, efficient resource pattern that minimizes overhead
Data Source
AI summary
Disclosed is a method for supporting uplink multiple-input and multiple-output (MIMO) in a wireless communication system. A method for transmitting data according to the present invention comprises the steps of: mapping, to first orthogonal frequency division multiplexing (OFDM) symbols within a subframe, first demodulation reference signals (DMRSs) corresponding to a first antenna port and a second DMRSs corresponding to a second antenna port; mapping, to second OFDM symbols except the first OFDM symbols within the subframe, first data corresponding to the first antenna port and second data corresponding to the second antenna port; and transmitting the subframe by using resources allocated to the uplink, wherein predetermined precodings are applied to the first data and the second data, and the predetermined precodings may be changed according to the index of the second OFDM symbols.