Communication Modulator Symbol Multiplexing
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Solution Overview
Problem
Current communication systems face inefficiencies in control signalling, particularly in reducing errors, due to the use of a single modulation method for both control and data signalling, which can lead to suboptimal performance.
Innovation Solution
A modulator is configured to multiplex control symbols and data symbols based on the distance between control symbol positions in a signal representation, utilizing Euclidean distance and power thresholds to optimize symbol placement, allowing for improved error reduction and quality of control signalling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single modulation method is used for both control signalling and data signalling, then device complexity is reduced, but control signalling reliability deteriorates due to suboptimal performance
Solution Approach 1:
The patent segments the signalling process into two distinct parts: control symbols and data symbols. Control symbols are allocated specific resource elements (REs) separate from data symbols, allowing different modulation strategies to be applied to each segment. This segmentation enables optimized control signalling while maintaining simplified overall system architecture.
Solution Approach 2:
The patent applies local quality by assigning specific properties to control symbols that differ from data symbols. Control symbols are placed at predetermined REs with specific modulation schemes (e.g., BPSK or QPSK) that are optimized for reliability, while data symbols use different modulation schemes (e.g., QAM) optimized for throughput. This local differentiation improves control signalling reliability without requiring complete system redesign.
2Productivity
If control symbols are placed closer together in the signal, then signal bandwidth efficiency is improved, but error risk increases due to reduced Euclidean distance between symbols
Solution Approach 1:
The patent utilizes multiple dimensions in the signal space to place control symbols. By considering both time and frequency dimensions (resource blocks and resource elements), the system can optimize the spatial distribution of control symbols. The predetermined REs are selected to maximize Euclidean distance in the complex signal plane while maintaining efficient bandwidth utilization across the available spectrum.
Solution Approach 2:
The patent changes the parameter of symbol spacing by using predetermined resource element allocations that ensure minimum Euclidean distance between control symbols. The modulation scheme for control symbols is also changed to use more robust schemes (BPSK, QPSK) with larger constellation distances, thereby improving error resistance while maintaining bandwidth efficiency through efficient resource element utilization.
Data Source
AI summary
A modulator and a modulation method for a communication device are disclosed. The modulator is configured to multiplex control symbols and data symbols for transmission in a signal based on information of the distance between the positions of at least two control symbols in a representation of symbol positions in the signal.