Multiplexing UCI and PTRS Symbols for Phase Noise Mitigation
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting and receiving wireless signals, particularly in handling uplink control information and phase tracking reference signals, which can be affected by phase noise and interference in high-frequency bands.
Innovation Solution
The method involves multiplexing uplink control information and phase tracking reference signals, spreading them using an orthogonal sequence, and performing discrete Fourier transformation to generate complex-valued symbol sequences for transmission through an OFDM-based physical uplink control channel, with specific configurations for PUCCH formats 1 and 4 to mitigate phase noise effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink control information and phase tracking reference signals are transmitted separately, then the transmission process is simple, but the efficiency and reliability of wireless signal transmission deteriorates due to phase noise and interference in high-frequency bands
Solution Approach 1:
The patent combines uplink control information (UCI) symbols and phase tracking reference signal (PTRS) symbols into a single block of modulation symbols for transmission. This merging approach allows simultaneous transmission of control information and phase tracking references, improving transmission reliability by reducing the number of separate transmission operations and minimizing exposure to phase noise and interference in high-frequency bands.
Solution Approach 2:
The patent segments the block of modulation symbols into specific patterns where UCI symbols and PTRS symbols are distributed across multiple subcarriers. The symbols are then spread using orthogonal sequences and processed through discrete Fourier transformation, creating structured segments that can be efficiently transmitted and received while maintaining signal integrity against phase noise.
2Productivity
If traditional transmission methods are used without spreading, then the device complexity is low, but the signal processing efficiency and interference resistance deteriorates
Solution Approach 1:
The patent applies preliminary spreading operations to the block of modulation symbols before discrete Fourier transformation. By spreading the symbols using orthogonal sequences with specific spreading factors, the system prepares the signal in advance to resist phase noise and interference, improving signal processing efficiency without requiring complex real-time processing during transmission.
Solution Approach 2:
The patent transforms the signal through discrete Fourier transformation, changing the parameter domain from time-domain spread symbols to frequency-domain complex-valued symbols. This parameter change enables efficient OFDM-based transmission while maintaining the benefits of spreading, achieving high signal processing efficiency through mathematical transformation rather than additional physical complexity.
Data Source
AI summary
The present disclosure relates to a wireless communication system, and more particularly, to a method including multiplexing UCI symbols and PTRS symbols to generate a block of modulation symbols; spreading the block of modulation symbols based on an orthogonal sequence with a spreading factor M to provide a length-L spread modulation symbol sequence, wherein the block of modulation symbols includes L/M modulation symbols, and L is a number 12 of subcarriers in a resource block; discrete fourier transforming the length-L spread modulation symbol sequence to provide a length-L complex-valued symbol sequence; transmitting the length-L complex-valued symbol sequence through an OFDM-based symbol for a PUCCH, and an apparatus therefor.