Reference Signal Sequence Design for Phase Noise Estimation
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Solution Overview
Problem
In new generation wireless communication networks operating above 6 GHz, such as 5G and 6G, the phase noise level increases significantly, leading to inaccurate phase noise estimation due to high phase noise power spectral density, which affects inter-subcarrier interference and common phase error compensation.
Innovation Solution
A method and apparatus for determining a reference signal sequence with stable amplitude responses in both time and frequency domains, using parameters like hardware capabilities and phase tracking reference signal parameters to select sequences like pi/2 BPSK based on Golay complementary sequences or ZC sequences, to improve phase noise estimation precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing PTRS sequences (QPSK modulated) are used for phase noise estimation, then the system can operate at high frequencies, but phase noise estimation precision deteriorates due to random amplitude fluctuations in time domain and poor resistance to channel frequency selectivity
Solution Approach 1:
The patent changes the fundamental parameters of the reference signal sequence by using pi/2 BPSK modulation instead of QPSK, and selecting sequences from Golay complementary sequences or ZC sequences with specific mathematical properties. This parameter change ensures constant amplitude in both time and frequency domains, directly resolving the amplitude stability issue while maintaining high frequency operation capability
Solution Approach 2:
The patent applies different sequence types (pi/2 BPSK, Golay complementary, ZC) to different frequency domain locations or channel conditions. By locally optimizing the sequence selection based on channel frequency selectivity characteristics, the system achieves better overall amplitude stability and phase noise estimation precision across varying transmission conditions
2Productivity
If high-frequency operation (above 6 GHz) is implemented to achieve high throughput, then data transmission rate improves, but phase noise power spectral density increases by 20×log 10(f1/f2) dB, causing larger phase errors
Solution Approach 1:
The patent converts the harmful effect of high phase noise into a benefit by designing reference signals with constant amplitude properties that are specifically robust against phase noise. The mathematical structure of Golay complementary sequences and ZC sequences transforms the phase noise challenge into an opportunity to use sequences with predictable correlation properties, enabling accurate phase estimation even at 28 GHz and above
Solution Approach 2:
The patent performs preliminary selection of reference signal sequences with constant amplitude properties before transmission. By pre-selecting sequences from Golay complementary sequences or ZC sequences that inherently possess amplitude stability, the system prepares against phase noise effects in advance, enabling accurate phase compensation when high-frequency signals are transmitted
Data Source
AI summary
This application discloses a reference signal determining method and an apparatus. The method includes a first device determines a first reference signal sequence in a reference signal sequence set. The first device maps the first reference signal sequence to a first symbol sequence, and sends a first reference signal corresponding to the first reference signal sequence to a second device based on the first symbol sequence. The first reference signal sequence is used by the second device to estimate impact of phase noise on a received signal, and the impact of the phase noise on the received signal includes at least one of inter-subcarrier interference, a common phase error, and the phase noise. The reference signal sequence set includes at least a first-type reference signal sequence. A time-domain amplitude variance and a frequency-domain amplitude variance of the first-type reference signal sequence each meet a preset threshold.