Inter-Symbol Transformation for Phase-Noise-Resilient Demodulation
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Solution Overview
Problem
High-frequency communication systems face challenges with phase noise, particularly for ultra-high-order modulation signals, leading to inter-symbol interference and demodulation errors, which current phase noise compensation methods increase processing overheads and are difficult to standardize.
Innovation Solution
A symbol processing method utilizing time-domain inter-symbol transformation processing to mitigate phase noise fluctuations without relying on terminal computing power, using transformation matrices like DFT, IDFT, and OCC matrices to smooth phase noise power and improve demodulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If iterative phase noise compensation solution is used, then demodulation accuracy is improved, but processing overheads at terminal increase
Solution Approach 1:
The patent applies preliminary action by performing phase noise compensation at the network side before signal transmission, rather than requiring iterative processing at the terminal. The network side device obtains phase noise information, performs compensation processing on the modulation symbols, and transmits the compensated signal to the terminal, thereby improving demodulation accuracy while avoiding increased processing overheads at the terminal device.
2Reliability
If phase tracking reference signals are introduced for phase noise compensation, then demodulation requirement is met, but resource overhead increases for ultra-high-order modulation
Solution Approach 1:
The patent changes the parameter of where phase noise compensation is performed - shifting it from terminal-side iterative processing or reference signal-based compensation to network-side preprocessing. This parameter change allows the system to meet demodulation requirements for ultra-high-order modulation without increasing resource overhead, as the compensation is performed using existing pilot structures and the compensated signal is transmitted directly to the terminal.
Data Source
AI summary
A symbol processing method is described. The method includes: obtaining a first modulation symbol block, where a time-domain resource of the first modulation symbol block includes M time-domain symbols, a frequency-domain resource of the first modulation symbol block includes N sub-carriers, and the first modulation symbol block includes M×N modulation symbols, where M is greater than or equal to 2, and N is greater than or equal to 1; and performing time-domain inter-symbol transformation processing on the first modulation symbol block to obtain a second modulation symbol block, where a time-domain resource of the second modulation symbol block includes M time-domain symbols, a frequency-domain resource of the second modulation symbol block includes N sub-carriers, and the second modulation symbol block includes M×N modulation symbols. Corresponding apparatuses and systems are also described.