Full-Duplex Waveform Puncturing for Reference Signal Hearability
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Solution Overview
Problem
Full-duplex wireless communication systems face challenges with self-interference and inter-UE interference, particularly affecting the demodulation of reference signals, which hinders effective channel estimation and signal reception performance.
Innovation Solution
The generation of waveforms with punctured resource elements (REs) for reference signals, such as demodulation reference signals (DMRS), is employed to improve hearability and reduce interference in full-duplex operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex wireless communication is implemented to transmit and receive signals simultaneously, then communication efficiency and throughput are improved, but self-interference and inter-user interference increase
Solution Approach 1:
The resource elements (REs) in the time-frequency grid are segmented into different types: data REs, reference signal REs, and punctured REs. By segmenting the REs and identifying which ones are occupied by reference signals in the opposite communication direction, the system can apply different processing strategies to different segments, thereby managing self-interference while maintaining full-duplex operation
Solution Approach 2:
The patent extracts and identifies reference signal REs from the overall RE set by checking against known reference signal positions. These extracted REs are then handled specially through puncturing or rate matching, separating them from the data transmission path to prevent self-interference while allowing full-duplex operation
2Measurement precision
If reference signals are transmitted in full-duplex mode, then channel estimation capability is improved, but interference from opposite direction signals increases
Solution Approach 1:
The system performs preliminary identification of reference signal RE positions before data transmission and reception. By knowing in advance which REs will be occupied by reference signals in the opposite direction, the transmitter can pre-adjust the data mapping (rate matching or puncturing) to avoid creating interference, and the receiver can pre-configure its processing to correctly handle the reference signals
Solution Approach 2:
Different quality requirements are applied to different REs: data REs are optimized for throughput, while reference signal REs are protected from interference through puncturing or rate matching. This local differentiation ensures that reference signals maintain high quality for accurate channel estimation, while data REs maximize spectral efficiency
3Productivity
If data is transmitted on all resource elements, then data throughput is maximized, but self-interference from reference signals degrades signal quality
Solution Approach 1:
Instead of transmitting data on all possible REs, the system deliberately withholds data transmission on certain REs (puncturing) or adjusts the mapping (rate matching) to avoid REs occupied by reference signals. This partial action sacrifices some potential throughput to ensure reliable reference signal reception and accurate channel estimation, which ultimately improves overall signal quality
Data Source
AI summary
Aspects described herein relate to modifying data for input to a discrete Fourier transform (DFT) so a set of resource elements (REs) output from the DFT for transmission in a communication direction includes one or more punctured REs corresponding to reference signals received in a different communication direction, performing the DFT for the data to generate the set of REs, mapping at least a portion of the set of REs to one or more symbols to generate a signal, and transmitting the signal in the communication direction. Other aspects relate to receiving the signal and decoding the data.