Reference Signal Time-Frequency Placement for Phase Noise Compensation
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Solution Overview
Problem
Existing high-frequency communication systems face challenges in arranging reference signals effectively to compensate for phase noise, leading to reduced system performance due to phase noise generated by local oscillators and phase-locked loops.
Innovation Solution
A method and device for arranging reference signals on time-frequency resources, including configuring time-domain symbol positions, frequency-domain positions, and orthogonal masks, to enable proper compensation for phase noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-frequency carriers are used for communication, then available bandwidth increases and high-speed data communication is enabled, but spatial fading losses increase significantly
Solution Approach 1:
The patent segments the communication signal into multiple reference signals with different cyclic shifts, allowing the receiving end to select and combine signals from multiple paths, thereby mitigating spatial fading losses while maintaining high data communication speed
Solution Approach 2:
The patent implements feedback mechanisms where the receiving end estimates phase noise and spatial fading characteristics based on reference signals, then uses this information to compensate for signal degradation, enabling reliable high-frequency communication
2Reliability
If the number of antennas is increased to compensate for spatial fading losses, then communication reliability improves, but system cost and power consumption increase
Solution Approach 1:
The patent makes reference signals serve multiple functions: they are used for channel estimation, phase noise compensation, and spatial fading mitigation simultaneously, eliminating the need for additional dedicated signals and reducing overall system complexity
Solution Approach 2:
The reference signals are designed to self-containedly provide all necessary information for compensation algorithms, allowing the system to achieve improved reliability through signal processing rather than hardware expansion
3Measurement precision
If reference signals are properly arranged on time-frequency resources, then phase noise compensation effectiveness improves, but signaling complexity increases
Solution Approach 1:
The patent changes key parameters of existing reference signals (cyclic shifts, frequency offsets, time positions) to enable phase noise compensation functionality, rather than introducing entirely new signal types, thereby maintaining signaling simplicity while improving measurement precision
Data Source
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AI summary
Provided is a reference signal transmission method and device. The method includes that a base station transmits indication information to a UE through a downlink control signaling or a higher layer signaling, where the indication information includes one of: information indicating that the UE transmits a reference signal, information indicating whether the reference signal is contained in a physical downlink shared channel or a physical downlink control channel, or information indicating a transmission mode of a downlink reference signal or an uplink reference signal; or the base station pre-defines with the UE a time-frequency resource or a parameter set required by the UE or the base station to transmit the reference signal, where the time-frequency resource or the parameter set includes at least one of: a time domain symbol position, a frequency domain position, a transmission period and a subframe offset, a type of a reference signal sequence or an orthogonal mask. This solves the problem in the existing art of how to properly place a reference signal on time-frequency resources and trigger a signaling correspondingly.