Adaptive Pilot Configuration for Wireless Channel Variability
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies due to fixed pilot configurations that fail to adapt to changing mobile communication environments, leading to reduced system capacity and reliability.
Innovation Solution
A method to adaptively configure pilots in real-time based on device capabilities, system requirements, and wireless channel characteristics, allowing for dynamic adjustments in time and frequency domain pilot densities to match changing environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pilots are fixedly configured in the system according to a certain pattern, then the system structure is simple and easy to implement, but the system cannot adapt to changing mobile communication environments, leading to reduced system capacity and reliability
Solution Approach 1:
The patent implements dynamic pilot configuration by allowing the base station to adjust pilot patterns, time domain densities, and frequency domain densities according to channel conditions, terminal mobility, and system load. This transforms the static pilot configuration into a dynamic adaptive system that can respond to changing communication environments, directly resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The patent changes key parameters including pilot pattern selection (normal/extended), time domain pilot density (1/2/4 symbols), and frequency domain pilot density (subcarrier spacing), allowing the system to adapt to different channel conditions and terminal scenarios. These parameter adjustments enable the system to optimize performance without requiring complete redesign of the pilot structure.
2Reliability
If pilot density is increased to improve channel estimation accuracy, then transmission reliability is improved, but system overhead increases and capacity is reduced
Solution Approach 1:
The patent applies local quality by configuring different pilot densities for different terminals and different time-frequency resources based on their specific channel conditions and mobility characteristics. High mobility terminals receive higher pilot density while low mobility terminals use lower density, optimizing the balance between reliability and overhead on a per-terminal basis rather than uniformly across the system.
Solution Approach 2:
The patent implements partial action by providing enhanced pilot density only when and where needed - specifically for high mobility terminals or poor channel conditions - rather than increasing pilot density system-wide. This selective approach improves reliability for vulnerable connections without unnecessarily increasing overall system overhead.
3Measurement precision
If pilots are configured frequently to track fast fading channels, then channel estimation accuracy is improved, but system overhead and complexity increase
Solution Approach 1:
The patent implements periodic pilot transmission with configurable periods, allowing the system to balance between tracking fast fading channels and reducing time overhead. The pilot periodicity can be adjusted based on channel coherence time and terminal mobility, providing regular channel estimates without excessive frequency that would waste time resources.
4Adaptability or versatility
If separate pilots and measurement pilots are used in MIMO systems, then the system can handle unknown pre-coding matrices, but the pilot overhead increases
Solution Approach 1:
The patent enhances the demodulation pilot to serve multiple functions - both for channel estimation and for acquiring pre-coding matrix information. By making the demodulation pilot multi-functional, the system can handle unknown pre-coding matrices without requiring completely separate measurement pilots, thereby reducing overall pilot overhead while maintaining adaptability.
Data Source
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AI summary
Disclosed is a method for configuring a pilot frequency in a wireless communication system, comprising: on the basis of at least one item among a current wireless channel characteristic parameter, device capability information of a correspondent node, and system requirement information, configuring in real-time a pilot frequency for different transmissions during a transmission process; and transmitting the configuration result to the correspondent node. Also disclosed is a corresponding device for configuring the pilot frequency. The present invention allows for configuration in real-time of the pilot frequency. This facilitates improved transmission reliability and guaranteed communication quality, and reduces pilot frequency overhead, and at the same time, is applicable in additional number of channel environments and application scenarios.