Non-coherent UCI Transmission via Matrix Diversity
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting uplink control information (UCI) without demodulation reference signals (DMRS), particularly in non-coherent demodulation scenarios where phase uncertainty is present, and in scenarios with limited resource availability.
Innovation Solution
The system configures communication devices with multiple antennas for non-coherent transmission diversity communications by selecting matrices from a pool to represent the UCI, using Gold sequences and specific matrix derivations to map vectors across transmit antennas, enabling efficient transmission and demodulation of UCI without relying on DMRS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DMRS are transmitted for coherent demodulation, then channel estimation accuracy is improved, but overhead increases and resource availability for data transmission decreases
Solution Approach 1:
The patent extracts and removes the DMRS from the transmission system, enabling non-coherent demodulation. This eliminates the need for reference signals while maintaining communication functionality through alternative methods that do not require coherent channel estimation.
Solution Approach 2:
The patent employs temporary correlation sequences that are transmitted only when needed for non-coherent demodulation, replacing the persistent DMRS. These sequences are used briefly during transmission and then discarded, reducing overall overhead.
2Quantity of substance
If non-coherent demodulation is used without DMRS, then overhead is reduced and resource efficiency is improved, but reliability in low SNR environments deteriorates
Solution Approach 1:
The patent introduces transmission diversity by spreading UCI across multiple antennas and time slots, adding a spatial and temporal dimension to the transmission. This diversity coding provides redundancy that improves reliability without requiring additional overhead signals.
Solution Approach 2:
The patent changes the modulation parameters by using frequency-shift keying (FSK) or other non-coherent modulation schemes that are more robust to phase uncertainty and low SNR conditions, enabling reliable transmission without DMRS.
3Reliability
If multiple antennas are configured for transmission diversity, then reliability and spectral efficiency are improved, but device complexity increases
Solution Approach 1:
The patent designs the multi-antenna system to serve multiple functions: UCI transmission, channel diversity coding, and spectral efficiency enhancement. The same antenna structure supports both control information transmission and data communication, reducing the need for separate dedicated components.
Solution Approach 2:
The patent pre-configures correlation sequences and coding matrices that are prepared in advance and stored in codebooks. During transmission, these pre-computed sequences are simply retrieved and applied, reducing real-time processing complexity while maintaining diversity benefits.
4Productivity
If DMRS are reduced or eliminated in certain slots, then productivity and data transmission efficiency are improved, but coherent demodulation capability deteriorates
Solution Approach 1:
The patent segments the transmission into different types of slots: some slots carry UCI with non-coherent demodulation, while other slots maintain coherent demodulation with DMRS. This segmentation allows the system to optimize each slot type independently, maximizing overall productivity.
Solution Approach 2:
The patent dynamically switches between coherent and non-coherent transmission modes based on channel conditions and traffic requirements. The system adapts its behavior in real-time, using non-coherent modes when productivity is prioritized and coherent modes when reliability is more critical.
Data Source
AI summary
A method of transmission of a set of I bits of information stream is described, in which said method comprises: selecting, from a pool of at least 2I matrices, a matrix to uniquely represent the set of I bits of information stream, wherein each matrix of the pool is a set of M vectors, and each vector is of length D; and transmitting a resource block across M transmit antennas, wherein respective vectors of the M vectors are transmitted on respective transmit antennas of the M transmit antennas. The transmitting comprises mapping respective entries of the respective vectors to respective resource elements of the resource block.