MIMO Reference Signal Control for High-Frequency Phase Noise Compensation
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Solution Overview
Problem
Existing MIMO transmission systems using high frequency bands like millimeter waves and terahertz waves are susceptible to phase noise, leading to common phase errors and inter-carrier interference, which degrade communication performance, especially in virtualization and distributed antenna systems where independent phase noises are generated across multiple antennas.
Innovation Solution
A communication apparatus and method that controls the transmission of phase noise compensation reference signals (PTRS) for each stream or collectively across streams based on conditions such as local oscillator commonality and accuracy, phase noise levels, and frequency bands, enabling appropriate phase noise compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO transmission is performed using high frequency bands (millimeter waves and terahertz waves), then throughput is improved, but phase noise causes common phase errors and inter-carrier interference which degrade communication performance
Solution Approach 1:
The patent segments the reference signal transmission by stream, allowing independent phase noise compensation for each MIMO stream. This is achieved by transmitting stream-specific reference signals that enable separate estimation and compensation of phase noise affecting each stream, thereby maintaining communication performance while utilizing high frequency bands for high throughput
Solution Approach 2:
The patent changes the transmission parameters of reference signals based on phase noise conditions. By adjusting reference signal transmission patterns, power levels, and timing according to measured phase noise characteristics, the system optimizes the balance between throughput and communication reliability in high frequency MIMO transmission
2Adaptability or versatility
If independent phase noises are generated across multiple antennas in virtualization and distributed antenna systems, then system flexibility and scalability are improved, but phase noise compensation becomes more difficult and communication performance degrades
Solution Approach 1:
The patent applies segmentation by assigning dedicated reference signals to each antenna and stream, enabling independent phase noise estimation and compensation. This segmented approach manages the complexity of independent phase noises across multiple antennas by treating each stream separately, maintaining system flexibility while providing targeted compensation
Solution Approach 2:
The patent implements feedback mechanisms where phase noise characteristics are estimated from received reference signals and used to adjust compensation parameters. This closed-loop feedback system automatically adapts to the independent phase noise conditions of each antenna, managing complexity through automated adaptation rather than manual configuration
Data Source
AI summary
A communication apparatus includes control circuitry which, in operation, controls transmission of a reference signal for phase noise compensation in each of a plurality of streams of multiple-input multiple-output (MIMO) transmission in accordance with a condition, and transmission circuitry which, in operation, transmits the reference signal according to the control.