Non-Coherent UE Transmitter Using DFT Matrices
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Solution Overview
Problem
Wireless communication systems face interference and signal degradation due to noise and interference, particularly in low signal-to-noise ratio conditions, leading to inefficiencies in coherent transmission techniques like DMRS-based communications.
Innovation Solution
Implementing a non-coherent transmission method using multi-dimensional operations, including diagonalized base sequence parameter matrices and discrete Fourier transform matrices, to reduce complexity and power consumption, and improve latency by transmitting codepoints without demodulation reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coherent transmission techniques like DMRS-based communications are used, then reliability is improved, but power consumption and processing complexity increase
Solution Approach 1:
The patent extracts and removes the DMRS (demodulation reference signal) component from the transmission structure. By eliminating the need for DMRS, the system achieves non-coherent transmission that reduces power consumption and processing complexity while maintaining acceptable reliability through alternative signaling mechanisms embedded in the data transmission itself
Solution Approach 2:
The patent changes the fundamental transmission parameter from coherent to non-coherent mode. This involves modifying the modulation scheme and receiver processing to operate without phase reference signals, thereby reducing the energy required for reference signal transmission and the processing power needed for correlation-based demodulation
2Reliability
If coherent transmission techniques like DMRS-based communications are used, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent removes the complex DMRS generation, transmission, and correlation processing chains from both transmitter and receiver. This extraction of the reference signal mechanism simplifies the device architecture while relying on more robust error correction coding and alternative detection methods to maintain reliability
Solution Approach 2:
The patent replaces the mechanical correlation-based demodulation system with a more simplified detection system. Instead of performing complex cross-correlation operations between received signals and stored DMRS sequences, the receiver uses direct signal detection combined with advanced decoding algorithms
3Use of energy by moving object
If non-coherent transmission is implemented, then power consumption is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where the receiver sends acknowledgment and channel quality information back to the transmitter. This feedback loop enables adaptive modulation and coding adjustments that compensate for the reduced measurement precision in non-coherent transmission, maintaining overall system performance while keeping power consumption low
Solution Approach 2:
The patent employs preliminary error correction coding and redundancy insertion before transmission. By pre-processing the data with robust coding schemes, the system creates a margin of error that compensates for the lower detection precision inherent in non-coherent transmission, ensuring reliable communication without requiring high-power reference signals
Data Source
AI summary
An apparatus for wireless communication includes a receiver configured to receive control information associated with a non-coherent transmission to a base station. The apparatus further includes a transmitter configured to perform the non-coherent transmission based on the control information. The non-coherent transmission includes transmission of a codepoint to the base station, and the codepoint is determined based a diagonalized base sequence parameter matrix, a first discrete Fourier transform (DFT) matrix of a first size, and a second DFT matrix of a second size.