Reference Signal Phase Rotation for Dense Orthogonal Multiplexing
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Solution Overview
Problem
The capacity of reference signals in wireless communication systems is insufficient to meet the increasing demands in scenarios with high carrier frequencies and high-speed motion, leading to challenges in channel estimation and signal multiplexing.
Innovation Solution
A method involving phase rotation of reference signals using frequency-domain and time-domain cyclic shift factors to generate second reference signal sequences, allowing for orthogonal multiplexing and increased capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time domain density of reference signals is increased to accurately track rapidly changing channel response, then channel estimation accuracy is improved, but overheads of reference signals are increased
Solution Approach 1:
The patent applies parameter changes by introducing a time-domain cyclic shift factor in addition to the existing frequency-domain cyclic shift factor. This modifies the reference signal generation parameters to create new orthogonal reference signal sequences that can be densely packed in the time domain without increasing overhead, thereby improving channel estimation accuracy while maintaining efficient resource utilization.
2Productivity
If capacity of reference signals is increased to support more antenna ports and high-speed scenarios, then system capacity is improved, but difficulty of orthogonal multiplexing is increased
Solution Approach 1:
The patent applies dimensionality change by extending the cyclic shift domain from only frequency-domain to include both frequency-domain and time-domain cyclic shift factors. This adds a time dimension to the reference signal orthogonalization process, enabling support for more antenna ports and high-speed scenarios while maintaining manageable multiplexing complexity through structured phase rotation in both domains.
Data Source
AI summary
A reference signal sending method includes obtaining a frequency-domain cyclic shift factor and a time-domain cyclic shift factor, wherein the frequency-domain cyclic shift factor and the time-domain cyclic shift factor are useable to perform phase rotation on a reference signal sequence. A reference signal sending method further includes generating a second reference signal sequence based on a first reference signal sequence, the frequency-domain cyclic shift factor, and the time-domain cyclic shift factor. A reference signal sending method further includes sending the second reference signal sequence on an antenna port p, wherein p is an element in a set {0, 1, . . . , P−1}, and P is an integer greater than or equal to 1.