Precoded Multi-Carrier Symbol Splitting for Wireless Overhead Reduction
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Solution Overview
Problem
In wireless communication networks using precoded multi-carrier modulation, the overhead signaling is high due to the need for dedicated symbols for reference signals, which reduces the resources available for data and control information.
Innovation Solution
A communication node splits a precoded multi-carrier symbol into separate parts, allocating one part for reference signals and another for data and/or control information, allowing flexible allocation and reducing the fraction dedicated to reference signals, thereby decreasing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated symbols are allocated for reference signals in precoded multi-carrier modulation, then reference signal transmission is ensured, but overhead signaling increases and resources for data/control information decrease
Solution Approach 1:
The patent combines reference signal transmission with data/control information transmission by allowing reference signals to be embedded within the same precoded multi-carrier symbols used for data transmission. This merging eliminates the need for separate dedicated reference signal symbols, thereby reducing overhead signaling while maintaining reference signal functionality for channel estimation and other purposes.
Solution Approach 2:
The precoded multi-carrier symbols are designed to serve multiple functions simultaneously: they carry both reference signals and data/control information. This multi-functionality allows the same time-frequency resources to be utilized for multiple purposes, increasing resource efficiency and reducing the overhead associated with dedicated reference signal symbols.
2Measurement precision
If more resources are allocated to reference signals, then channel estimation accuracy improves, but transmission efficiency for data and control information decreases
Solution Approach 1:
The patent applies local quality by strategically placing reference signals within specific resource elements of the precoded multi-carrier symbols rather than allocating entire symbols exclusively to reference signals. This localized approach ensures sufficient reference signal density for accurate channel estimation in critical areas while preserving resources in other areas for data and control information transmission.
Solution Approach 2:
Instead of allocating full dedicated symbols for reference signals (excessive action), the patent uses partial allocation by embedding reference signals within the data symbols. This partial action provides sufficient channel estimation capability without over-allocating resources, thereby maintaining transmission efficiency while achieving adequate measurement precision.
Data Source
AI summary
A method performed by a communication node for transmission using a precoded multi-carrier modulation scheme in a wireless communications network is provided. The communication node splits a precoded multi-carrier symbol into at least a first symbol part and at least a second symbol part. Also, the communication node modulates the at least first and second symbol parts such that the first symbol part of the precoded multi-carrier symbol is used for transmission of a reference signal and the second symbol part of the precoded multi-carrier symbol is used for transmission of data and/or control information. Then, the communication node transmits the reference signal and the data and/or control information in the modulated precoded multi-carrier symbol.